JP2011122744A - Moving form device for monolithic refractory lining and sequential construction method for monolithic refractory - Google Patents

Abstract

A lining material construction apparatus capable of preventing leakage when molten metal is poured, shortening construction time, and forming a good lining without cracks or the like.
A movable frame device for an irregular refractory lining, which is a column-shaped post that stands vertically on a base, and a cylinder that can be moved up and down continuously along the outer peripheral surface of the post. Shaped elevator, a frame fixed to the cylindrical elevator and capable of continuously raising and lowering together with the elevator, a plurality of mold members arranged so as to surround the frame, and an inner periphery of the cylindrical container A plurality of formwork member supports for pressing toward the surface, and a curing determination device that can determine whether or not the lining material located in the lower part of the formwork member of the lining material is cured. The matching formwork members are contacted or partially overlapped to form a continuous formwork arranged in the circumferential direction spaced apart from the inner peripheral surface of the cylindrical container as a whole.
[Selection] Figure 1

Description

  The present invention relates to a molten metal container, a molten metal processing apparatus, a movable mold apparatus for refractory lining lining used as a lining means for a high-temperature atmosphere furnace, and a method for continuously applying an irregular refractory using the apparatus. Is.

  The refractory is an indispensable member for processing and holding a high-temperature substance such as a molten metal, and the refractory is exposed to a thermal shock due to the entry and exit of high-temperature contents and is in an environment that is easily destroyed. In particular, in the ladle used in the molten metal refining process and the tundish used in the continuous casting process, a refractory is constructed on the inner surface of the iron skin, but it is used for such a molten metal processing container. As the refractory, a brick or an irregular lining material is used.

  In a molten metal processing container constructed by brick, a gap is generated in the gap between the brick and the brick. Although this gap is filled with mortar or the like during construction, the mortar deteriorates and breaks down during use, causing a phenomenon called joint breakage, which causes leakage of molten metal. In addition, since brick construction is a skillful work and a large amount of bricks are manually stacked one by one, it takes a long time. From these viewpoints, it is preferable to employ a construction method using an irregular lining material.

  The amorphous lining material can be applied to the inner surface of the container by various methods such as spraying. However, from the viewpoint of obtaining sufficient durability and resistance to erosion, it is preferable to adopt a casting method.

  Also, a lining method in which no joint is formed is desirable for preventing leakage of molten metal from the joint of the lining.

  Furthermore, in the case of a lining formed of multiple layers, shallow irregularities are formed in a range that does not affect the corrosion resistance at regular intervals on the lining of the second layer so that the exposure of the second layer is clearly visible when the outermost layer disappears It is desirable that there is a pattern formed by the part.

  As a method of constructing lining material by pouring into a cylindrical container such as a ladle, conventionally, a mold with a height from the bottom of the ladle to the upper opening is formed, and between the inner surface of the container and the outer surface of the mold A method of pouring a lining material has been proposed (see Patent Document 1).

  In addition, as an apparatus for lining the inner surface of a cylindrical container while moving a mold, an apparatus using a plurality of endless belt bodies attached in the vertical direction of the mold is disclosed (see Patent Document 2). .

  Furthermore, in order to improve the efficiency of Patent Document 2, the mold body is installed concentrically in the height direction on the inner surface of the cylindrical container, the lining material is poured, and after the poured lining material is cured, the mold member is A method has been proposed in which construction is performed by repeating the steps of separating the construction surface, raising the formwork member, and forming the formwork (see Patent Document 3).

  By adopting such a lining material construction method, it is only necessary to pour the lining material at a stretch, and it is possible to construct the lining material efficiently and to ensure sufficient lining thickness and durability of cylindrical containers such as ladle. There is an advantage that the melt resistance can be improved.

JP-A-8-159667 JP 2005-308285 A JP 2008-164255 A

  However, in the technique described in Patent Document 1, since the lining material is poured over the entire inner surface of the container, it takes time to pour, and construction using a quick setting agent cannot be performed. Therefore, after pouring the lining material, it must take a long curing time until the lining material hardens, and during that time, the container cannot be used for the smelting process, and the mold is installed in the container There is a problem that it cannot be used for construction of other containers.

  Moreover, in the case of a cylindrical container having a height of 4 to 5 m like a ladle, there is a problem that it is difficult to sufficiently fill the lining material in the gap between the mold and the inner surface of the container even if a vibrator or the like is used. is there. This problem becomes more prominent as the lining thickness is thinner. Moreover, when it implements to the cylindrical container which is not a cylinder like a tundish, there exists a problem that filling of a corner | angular part is difficult.

  The technique described in Patent Document 2 cannot be said to be sufficiently efficient because the lining operation of the container is performed in the circumferential direction. Further, in order to move the mold divided in the circumferential direction in the height direction, a vertical joint extending from the bottom to the upper opening is formed in the lining.

  In the technique described in Patent Document 3, after the lining material is poured, it is necessary to wait until the poured lining material is hardened. For this reason, circumferential lateral joints are generated. In addition, the construction apparatus described in Patent Document 3 does not move the formwork continuously, and it takes time for construction to form a lining by repeatedly performing mold installation, pouring, curing and holding, and removing the frame. However, it cannot be said that efficiency has been improved. Even if the formwork is moved continuously, it is difficult to form a good lining because there is no device for determining the curing.

  The object of the present invention is to prevent the leakage when molten metal is poured, to shorten the construction time, and to form a good lining without cracks, the lining material construction method, the lining material It is to provide construction equipment.

  In the conventional technology such as Patent Document 3, since it is difficult to determine the curing of the lining material in the mold, it is difficult to continuously move the mold, but by introducing an apparatus for determining the curing. The present inventors have found that the movement of the mold can be made efficient and that a good lining can be formed.

The gist of the present invention is as follows.
(1) It is a movable formwork device that is installed in a cylindrical container and continuously pours an irregular refractory into the inner peripheral surface of the cylindrical container for lining, and stands vertically on a base. A column-shaped post, a cylindrical elevator fitted into the post and continuously movable up and down along the outer peripheral surface of the post, and a horizontal direction smaller than the inner peripheral surface size of the cylindrical container A pedestal having a cross-sectional shape, fixed to the cylindrical elevator and capable of continuously ascending and descending with the elevator, and a plurality of formwork members disposed so as to surround the gantry horizontally outside the gantry A plurality of formwork members, which are installed in the same number as the formwork members on the mount, each support the formwork members and press the formwork members toward the inner peripheral surface of the cylindrical container. Pour into the support and the inner peripheral surface of the cylindrical container A curing determination device capable of determining the presence or absence of curing of the lining material located at the lower part of the mold member among the inning material, and the mold member is in contact with the ends of adjacent mold members or A movable formwork apparatus for an indeterminate refractory lining characterized in that a part thereof overlaps to form a continuous formwork in the circumferential direction arranged as a whole apart from the inner peripheral surface of the cylindrical container.
(2) The indeterminate form according to (1), wherein the curing determination device is a lifting force measuring device that is installed on the post or the lifting device and measures a lifting force when raising the lifting device. Mobile formwork device for refractory lining.
(3) The said hardening determination apparatus is installed in the said mold member, and is 1 type, or 2 or more types chosen from the said lifting force measuring device, a side pressure measuring device, a temperature measuring device, and a penetration type hardness measuring device. The movable mold apparatus for an indeterminate refractory lining described in (1).
(4) When the respective formwork members are pressed against the inner peripheral surface of the cylindrical container on the upper portions of the plurality of formwork members, the formwork member and the inner peripheral surface of the cylindrical container, The movable formwork apparatus for an indeterminate refractory lining according to any one of (1) to (3), wherein a spacer is provided for keeping the separation distance constant.
(5) The spacer is detachable, can be replaced with another spacer, and the distance between the mold member and the inner circumferential surface of the cylindrical container can be changed. (1) to (4) ) A movable formwork device for an irregular refractory lining according to any one of the above.
(6) In any one of (1) to (5), each of the plurality of mold members is provided with unevenness on the surface facing the inner peripheral surface of the cylindrical container. The movable formwork device for the irregular refractory lining described.
(7) The indefinite form according to any one of (1) to (6), wherein the plurality of formwork member supports are either only a cylinder or a combination of a cylinder and a coil spring. Mobile formwork device for refractory lining.
(8) The plurality of formwork members to be arranged are an even number, and the plurality of formwork member supports are the coil springs every other one. A mobile formwork device for fixed refractory lining.
(9) The cylindrical container is a cylindrical container having a polygonal horizontal cross-sectional shape, and among the plurality of formwork members arranged, the formwork arranged corresponding to the corners of the polygon. The formwork member support for supporting a member is the coil spring, and the movable formwork device for an irregular refractory lining according to (7).
(10) The movable frame apparatus for indeterminate refractory lining according to any one of (1) to (9), wherein the elevator has a work base above the base.
(11) A method for continuous construction of an irregular refractory using the movable formwork device for irregular refractory lining according to any one of (1) to (10), wherein the post is formed of the cylindrical container. The movable mold apparatus is installed in the cylindrical container so as to overlap with a central axis, and the plurality of mold members are supported by the plurality of mold member support members at the lowermost part of the cylindrical container. A mold body placement step of placing a continuous mold body in the circumferential direction, which is pressed toward the inner circumferential surface and arranged spaced apart from the inner circumferential surface of the cylindrical container as a whole; and the container inner circumferential surface; A first lining material pouring step for pouring the lining material to a predetermined height into the spaced gap with the mold body, and of the poured lining material, the curing determining device removes the lining material at the lower part of the mold member. After detecting the hardening of the frame part, A second lining material pouring step for continuously pouring the lining material while raising the frame continuously. In the second lining material pouring step, the lining material is used by the curing determination device. A continuous construction method for an indeterminate refractory, characterized in that the hardening of the mold is continuously detected and the mold body is continuously pulled up while adjusting the rising speed of the mold member based on the detection result.
(12) A method for continuous construction of an amorphous refractory using the movable formwork apparatus for refractory lining according to any one of (1) to (10), wherein the movement into the cylindrical container A formwork device is installed, and at the lowest part of the cylindrical container, the plurality of formwork members are pressed against the inner peripheral surface of the cylindrical container by the plurality of formwork member supports, and the tubular shape as a whole A lining is provided in the mold body disposing step of disposing the continuous mold frame in the circumferential direction that is spaced apart from the inner peripheral surface of the container, and the spaced gap between the inner peripheral surface of the container and the mold frame. The material is continuously poured, and after the curing determination device detects the curing of the lining material in the lower part of the mold member, the mold body is moved upward to remove the frame and form a lining space. A lining material flow comprising: In the indenting step, the curing of the lining material is detected at regular time intervals, the movement of the mold member is determined, and the mold body is intermittently pulled up based on the determination result. Continuous construction method of refractories.
(13) The continuous construction method for an irregular refractory according to (11) or (12), wherein the lining material is poured into the lining material while mixing.

  In the present invention, the “unframed portion” refers to a construction body part that has escaped from the lining space formed by the mold body due to the rise of the mold body.

  According to the present invention, when the lining material is applied to the inner surface of the container, the mold body composed of a plurality of mold frame members divided in the circumferential direction is continuously moved in the height direction while continuously flowing the lining material. As a result, a lining having no joints can be formed, which can contribute to prevention of leakage of molten metal.

  Further, since the lining material can be poured into the lining material, the curing time after pouring can be shortened, and the lining can be efficiently formed in a short time.

  In addition, by providing a mechanism for measuring the lifting force when moving up and down, changes in the pulling resistance due to friction between the material and the mold body can be measured, that is, the degree of hardening of the material that is optimal for moving the mold body is determined. It is possible to determine the moving speed of the mold body, the timing of the speed change, and the speed change amount, and it is possible to form a good lining without cracks.

It is a top view which shows the construction apparatus 1 of the lining material which concerns on 1st Embodiment of this invention. It is a vertical direction side view of the construction apparatus which shows the lining material construction apparatus 1 which concerns on 1st Embodiment of this invention. It is a vertical direction side view of the construction apparatus which shows the lining material construction apparatus 1 which concerns on 1st Embodiment of this invention. It is a top view which shows the construction apparatus 11 of the lining material which concerns on 2nd Embodiment of this invention. It is the vertical direction side view of the construction apparatus which shows the construction apparatus 11 of the lining material which concerns on 2nd Embodiment of this invention. It is the vertical direction side view of the construction apparatus which shows the construction apparatus 11 of the lining material which concerns on 2nd Embodiment of this invention. It is the figure which looked at the formwork member which concerns on a form different from a lifting force measuring apparatus from the inner side as a hardening determination apparatus. It is an overhead view which shows the formwork member which concerns on a form different from a lifting force measuring apparatus as a hardening determination apparatus. It is a side view which shows the formwork member which concerns on a form different from a lifting force measuring apparatus as a hardening determination apparatus. The number of occurrences of microcracks per unit area after passing through the furnace algebra is compared between the new lining of this example and the old lining of the refractory brick structure. The results of the erosion test are compared between the new lining of this example and the old lining of the refractory brick structure. The time taken for the construction is compared between the new lining of this example and the old lining of the refractory brick structure.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The movable formwork apparatus of the present invention is for continuously lining an indeterminate refractory on the inner surface in a cylindrical container, and as long as it is cylindrical, the cross-sectional shape may be circular or polygonal. . First, a case where the cross section is rectangular will be described.

  1 to 3 show a lining material construction apparatus (movable mold apparatus) 1 according to a first embodiment of the present invention when a tundish T which is a molten metal container is taken as an example. FIG. 1 is a plan view, and FIGS. 2 and 3 are vertical side views of the construction apparatus.

  This construction apparatus 1 is an apparatus for pouring a lining material such as castable, which is an irregular refractory, inside a tundish T, which is a molten metal container, and comprises a base 2, a post 3, a base 4, a work base 5, a mold member 6, a hydraulic cylinder 7, a spring 8, a spacer 9, and a lifting force measuring mechanism 10.

  The tundish T has an iron skin structure that expands toward the upper part. When the lining is one layer, the lining material such as castable is constructed on the inner surface of the iron skin, and the lining has two or more layers. In the case of multiple layers, a lining material such as castable is applied to the inner surface of the iron skin and the inner surface of the refractory.

  The base 2 is composed of a circular plate-like body that is installed at the bottom of the tundish T during construction, and is a part that supports the load of the construction apparatus 1 as a whole.

The post 3 is composed of a columnar body standing on the circular center of the base 2, and a cylindrical elevator that can be moved up and down continuously is attached along the outer peripheral surface of the post 3. In addition, a gantry 4, a work gantry 5, a formwork member 6, a formwork member support (a hydraulic cylinder 7 which is an example of a cylinder according to the present embodiment), and an example of a coil spring according to the present embodiment. A certain spring 8), a spacer 9, and a quotation force measuring apparatus 10 which is an example of a curing determination apparatus according to this embodiment can move up and down together with an elevator.
In addition, although raising / lowering of an elevator can use the lifting system by a chain block etc., it is not this limitation. In the present embodiment, the lifting force measuring device 10 is built in a cylindrical elevator.

The gantry 4 is a connecting member between the lifting force measuring device 10 and a hydraulic cylinder 7 and a spring 8 which are formwork member supports, and is a flat plate-like body which is installed on an elevator so as to be movable up and down.
The same number of formwork member supports as the formwork members 6 are installed on the gantry 4 to support the formwork members 6 and press the formwork members 6 toward the inner peripheral surface of the cylindrical container. In this embodiment, the hydraulic cylinder 7 or the spring 8 is used.
The formwork member support and the formwork member 6 are connected so as to be freely movable by an appropriate angle in the height direction, and correspond to the taper of the tundish T by the pressing pressure of the hydraulic cylinder 7 and the spacer 9.

  The work platform 5 is a flat plate-like body that is installed as necessary and is attached to the elevator so as to be movable up and down, as well as the platform 4, and provides a scaffold for an operator to perform construction work.

The mold member 6 forms a space for supplying a lining material between the inner surface of the cylindrical container, and a plurality of mold members 6 are arranged on the outer side in the horizontal direction of the gantry 4 so as to surround the gantry 4, and are installed on the gantry 4. A frame member support (in this embodiment, a hydraulic cylinder 7 or a spring 8) is mounted.
The formwork member 6 has a circumferential dimension obtained by dividing the inner circumference of the target container by, for example, 4 to 10, and all the formwork members 6 are adjacent to the adjacent formwork members 6 to prevent leakage of the lining material. The construction apparatus 1 has a number of mold members 6 equal to or greater than the number of divisions.
Since all the formwork members 6 overlap the adjacent formwork members 6 at the left and right ends, construction can be performed by exchanging the spacers even in containers having different inner diameters and in different refractory thicknesses.
At the time of construction, a lining space having no joints is formed in the circumferential direction by the plurality of mold members 6, and all of the mold members 6 forming the lining space are collectively referred to as a mold body.

The hydraulic cylinder 7 is installed on all or part of the mold member 6 and has a mechanism for moving the mold member 6 back and forth in the radial direction.
When the hydraulic cylinder 7 is installed on all the formwork members 6, the spring 8 is not installed on the formwork member 6.
When the hydraulic cylinder 7 is installed on some formwork members 6, the formwork member 6 on which the hydraulic cylinder 7 is not installed presses against the formwork member 6 on which the hydraulic cylinder 7 is installed. Is installed, and follows the advancing and retreating behavior of the mold member 6 on which the hydraulic cylinder 7 is installed.

When the formwork member 6 on which the spring 8 is installed is located outside the formwork member 6 on which the hydraulic cylinder 7 is installed, the pressing pressure direction of the spring is inward, and the hydraulic cylinder 7 is installed. When the formwork member 6 on which the spring 8 is installed is located on the inner side than the formwork member 6, the pressing pressure direction of the spring is directed outward.
The hydraulic cylinder 7 must be installed on the formwork member 6 adjacent to the formwork member 6 on which the spring 8 is installed. When the formwork member support is the spring 8, basically, only the tension or only the pressing stress is applied to the formwork member 6. Therefore, in order to move the formwork member 6 supported by the spring 8 in the direction opposite to the direction of the force applied by the spring 8, the hydraulic cylinder 7 is supported by the hydraulic cylinders 7 adjacent to both sides of the spring 8. The mold member 6 supported by the spring 8 is moved together with the mold member 6 being moved. Therefore, the mold member 6 supported by the spring 8 needs to be installed so as to partially overlap the adjacent mold members 6 on both sides. For example, in FIG. 1, the spring 8 supports the formwork member 6 so that stress acts in the pulling direction. Therefore, with respect to the mold member 6 supported by the hydraulic cylinders 7 adjacent to both sides, the mold member 6 supported by the spring 8 is disposed relatively outside, and the both end portions thereof are overlapped. It has become.
The springs 8 and the hydraulic cylinders 7 do not necessarily have to be provided alternately. For example, the four corners in FIG. 1 may be replaced with the springs 8 and the linear springs 8 may be replaced with the hydraulic cylinders 7. Absent.

Moreover, in FIG. 1, the spring 8 is arrange | positioned every other with respect to each formwork member 6 so that it may be arrange | positioned at the corner | angular part of the cylindrical container whose horizontal cross-sectional shape has a polygon.
By arranging the springs 8 at the corners of the cylindrical container, the number of hydraulic cylinders 7 that require power is reduced, and the springs 8 installed between the hydraulic cylinders 7 buffer the movement of the plurality of hydraulic cylinders 7. As a result, failure of the mold member 6 is prevented, and the operation of moving the hydraulic cylinder 7 back and forth is simplified.

In order to apply to cylindrical containers with different circumferences or lining formation of a plurality of layers, the movable amount of the mold member 6 by the hydraulic cylinder 7 is preferably 500 mm to 1000 mm.
Although the height dimension of the mold member 6 can be about 300 mm to 1500 mm, it is most efficient to set it to about 700 mm to 1000 mm in consideration of transportation, workability and the like.

A height is formed on the surface of the lining by attaching a continuous uneven portion having a constant width and a constant thickness from the lower end to the upper end of the mold on the outer surface of the mold (the surface facing the inner peripheral surface of the tundish T). Forms a striped pattern of unevenness in the direction.
The striped pattern formed on the lining surface can be used to replace the formwork member 6 having an arbitrary unevenness, thereby forming unevenness of various widths and depths.
When it is not preferable to form a striped pattern on the lining surface, a completely flat lining surface can be formed by replacing with a mold member 6 having no irregularities on the outer surface of the mold.
As for the uneven | corrugated | grooved part formed in the lining surface, 2-50 mm in width and 5-40 mm in depth are preferable so that corrosion resistance may not be impaired. The shape of the unevenness is changed depending on the purpose, and when the anchor effect with the upper layer is obtained, the unevenness having a width of 10 to 30 mm and a depth of 10 to 20 mm is preferable. In the case of using the thermal expansion absorption allowance in use, the unevenness having a width of 2 to 5 mm and a depth of 20 to 40 mm is preferable. In the case of marking for visual recognition when the upper layer is peeled off, a width of 2 to 5 mm and a depth of 5 to 20 mm, or a width of 20 to 50 mm and a depth of 5 to 20 mm are preferable.

  The mold member 6 is in a state in which the adjacent end of the mold member 6 is in the state of being protruded most from the hydraulic cylinder 7 and the circumferential end thereof is in contact with an overlap of 10 mm to 50 mm, and in a state where the protrusion amount is smaller than this, The overlap amount of the circumferential direction edge part of an adjacent formwork member increases, and it has the structure where a perimeter changes, thereby responding to the internal diameter change of the container resulting from the diameter expansion structure of the tundish T.

  The spacer 9 defines the thickness of the lining space between the mold body and the cylindrical container surface at the outer upper end of the mold member 6, and the spacer 9 moves along the construction surface of the tundish. A construction body having a constant thickness with little variation in thickness from the lower end to the upper end is formed.

  The spacers 9 are installed at regular intervals at the upper end of the mold member, and have a wheel for running the construction surface at the tip of the rod-shaped protrusion so as not to hinder the flow of the lining material into the mold. A construction body having a desired lining thickness is formed by arbitrarily changing the thickness of the spacer 9 from 20 mm to 500 mm.

  Since the mold member 6 is moved upward, the spacer 9 is preferably installed at the upper end of the mold member.

When the spacer 9 is installed, the mold member 6 is installed in a state of being separated from the inner periphery of the cylindrical container to be constructed, and the hydraulic cylinder 7 is operated to follow the change in the inner peripheral diameter of the cylindrical container. The mold body is moved upward in the state.
When the spacer 9 is not installed, the formwork member 6 is installed in a state of being separated from the inner periphery of the cylindrical container to be constructed, and the hydraulic cylinder 7 is not operated, so that the inner peripheral diameter of the cylindrical container is changed. The mold body is moved upward without being attached.

  First, an example using a lifting force measuring device will be described as a curing determination device.

The lifting force measuring device 10 is installed on the post 3 and measures the lifting force when moving the stand 4, the work stand 5, the formwork member 6, the hydraulic cylinder 7, the spring 8, the spacer 9, and the lifting force measuring device 10. To do. The lifting force can be measured by using a load cell or the like, but is not limited thereto.
When the lifting / lowering of the elevator provided in the post 3 is caused by the chain block, the load cell is installed by interposing a tension type load cell in the chain block.
The number of load cells to be installed is one for each of the chain blocks.

With the lifting force measuring device 10, it becomes possible to measure a change in the lifting resistance due to friction between the lining material and the mold body, and the hardening of the material can be determined. By moving the mold body while observing the pulling resistance, it is possible to optimize the moving speed, speed change timing, and speed change amount of the mold body.
With regard to the pulling force, the difference from the no-load operation is regarded as the frictional resistance, and it is preferable to construct the frictional resistance to be in the optimum range in order to obtain a good construction body without cracks.
The optimum range of frictional resistance varies depending on the lining material used and the material of the mold member 6.

The lifting force measuring device 10 continues to move during the movement of the formwork, and the lifting force measuring device 10 continuously detects the frictional resistance and monitors the hardening of the material.
In addition, although the frictional resistance can be detected at a constant time interval by the lifting force measuring device 10 and the hardening of the material can be monitored, this case will be described later.

  There is no restriction | limiting in the conveyance method of material, An air conveyance, free fall, a screw auger etc. can be used, However It is not this limitation.

  4 to 6 show a lining material construction apparatus 11 according to a second embodiment of the present invention. 4 is a plan view, and FIGS. 5 and 6 are vertical side views of the construction apparatus.

  This construction apparatus 11 is an apparatus for constructing a casting lining material such as an indeterminate refractory by pouring the inside of a ladle t which is a molten metal container. 15, a mold member 16, a hydraulic cylinder 17, a spring 18, a spacer 19, and a lifting force measuring device 20.

  Since the role of each device configuration is the same as in the first embodiment, it will be omitted, but this construction method can be used for square tubes and cylinders by changing the shape of the construction device, but the shape of the molten metal container to be processed is This is not the case.

The curing determination device is not limited to the lifting force measurement device, and any one of a lateral pressure measurement device, a temperature measurement device, an intrusion hardness measurement device, or a plurality of devices installed in the mold member is used. It doesn't matter.
Moreover, you may use together several apparatus of a lifting force measuring device, a side pressure measuring device, a temperature measuring device, and a penetration type hardness measuring device.

  FIGS. 7 to 9 show a mold member 6 according to another embodiment different from the lifting force measuring device as a curing determination device. 7 is a view of the mold member 6 as seen from the inside, FIG. 8 is an overhead view, and FIG. 9 is a side view.

  This formwork member 6 is provided with a curing determination device in the formwork member 6 of the embodiment shown in FIGS. 1 to 3, and includes a lateral pressure or temperature measurement device 21, a penetration type hardness measurement device support member 22, a penetration type. A hardness measuring device 23 is provided. That is, this embodiment is a form in which the lateral pressure or temperature measuring device 21 and the penetration hardness measuring device 23 are used in combination.

The lateral pressure or temperature measuring device 21 is for measuring the lateral pressure or temperature of the outer surface of the mold, and the lateral pressure decreases with curing and the temperature increases with curing. The measurement of the side pressure or temperature can be selected continuously or every predetermined time.
When the material hardens and becomes self-supporting, the side pressure decreases because the weight applied to the formwork decreases.

During construction, construction is performed so that the lateral pressure takes a substantially constant value.
When a material is poorly cured, the lateral pressure decreases when curing is early, and the lateral pressure increases when curing is slow.

The penetrating hardness measuring device support member 22 is a member that supports the penetrating hardness measuring device 23 so as to freely move in the vertical direction. The penetration-type hardness measuring device 23 has a rod-like shape, and is a device that measures resistance when penetrating into the lining material, and determines the curing depth based on the resistance.
The curing depth refers to the depth from the placement surface to the cured portion. The penetration hardness is measured every predetermined time.
Since the penetration-type hardness measuring device 23 that has penetrated has a resistance that changes abruptly when reaching a cured depth, the depth when a sudden change in resistance is observed is determined as the curing depth.

Hardening determination judges that the state which expressed the intensity | strength in which a construction body became independent became hardened. The self-supporting strength is a strength that does not cause a shape change due to its own weight, and is calculated from the weight applied to the lining material when the frame is removed.
The weight applied to the lining material at the time of frame removal can be determined from the volume of the material in the mold at the time of frame removal and the specific gravity of the material. At this time, the volume of the material can be calculated from the discharge amount of the material, the size in the frame, the moving speed, and the like.

  If the time interval for curing determination is long, the poured material may be cured until it reaches the placement surface, so that a joint can be formed. It is preferable to set a time interval (for example, every 20 seconds) that cannot be performed.

  The lining material is composed of all or a part of a refractory raw material, a binder, a dispersant, a quick setting agent, and a curing retarder.

  The refractory raw material in the lining material is not limited, but the main refractory raw materials are alumina, siliceous, alumina-silica, alumina-spinel, alumina-magnesia, alumina-carbon, alumina -SiC, alumina-SiC-carbon, magnesia, magnesia-carbon, carbon, silicon carbide, silicon nitride, zirconia, calcia, dolomite, chromium, chromium-magnesia, magnesia-lime , Magnesia-alumina, and a material that is a combination thereof can be applied without any problem.

  As the binder for curing, alumina cement, phosphate, sodium silicate, clay, resin, and pitch are generally used.

  Further, a dispersant is used for the purpose of reducing moisture. Dispersants include phosphates (sodium pyrophosphate, soda tripolyphosphate, soda hexametaphosphate, soda pyrophosphate, ultrapolyphosphate soda), carboxylic acids (sodium citrate, soda gluconate), acrylic acid ( Polyacrylic acid soda, polyacrylic acid, polyacrylic acid ester), other materials (polyalcohol-based, ligninsulfonic acid-based), and the like, and combinations thereof can be applied without any problem.

  In order to adjust the timing of curing, a quick setting agent or a curing retarder may be used.

  Examples of the quick setting agent include Na, K, Ca hydroxide, Na, K silicate, dilute sulfuric acid, 0.5 to 1.0% by mass of sulfate, nitrate, Li salt, triethanolamine, etc. Examples include organic bases, Portland cement, and alumina cement hydrate.

  On the other hand, as the retarder, Mg, Ba hydrate, Na, K, Ba, Mg, Ca chloride, 0.25 mass% or less sulfate, nitrate, citric acid, tartaric acid, glucose acid salt, Examples include borax, lead salts, phosphates, sugars, flour, glycerin, glucose, and cellulose.

  Although the above chemicals can be used, this is not restrictive.

  A curing accelerator, a curing retarder, and a dispersing agent are mixed in advance in a binder, mixed in an amorphous refractory in advance, or added when kneading an amorphous refractory. It may be added just before pouring into the refractory.

  The temperature of the material can be applied in the range of 0 ° C to 50 ° C, preferably 10 ° C to 30 ° C.

  It describes about the continuous construction method of the amorphous refractory at the time of using the movable formwork apparatus for amorphous refractory lining shown by FIGS. Here, the case where a lifting force measuring apparatus is used as a hardening determination is shown.

  The movable mold apparatus 1 in which the spacer 9 having a predetermined thickness is installed is installed so that the post 3 overlaps the central axis of the tundish T with the hydraulic cylinder 7 contracted.

  The diameter of the mold member 6 is expanded by the hydraulic cylinder 7 to such an extent that the spacer 9 comes into contact with the inner surface of the cylindrical container, thereby forming a mold body that is spaced apart from the inner surface of the cylindrical container by a certain dimension.

The lifting force measuring device 10 is activated so that the frictional force between the mold body and the lining material can be continuously detected.
The lifting force measuring device 10 may be in a state in which the friction force can be detected at regular time intervals.

Pouring of the lining material whose curing time is controlled is started into the spaced gap.
The lining material is poured continuously until construction is completed unless an abnormality is detected.

  After a lapse of time for the lining material poured in early to sufficiently harden, the upward movement of the mold body is started.

  The rising speed of the lining material casting surface is synchronized with the rising speed of the mold body, and the rising speed of the lining material casting surface is calculated from the curing speed of the lining material and the amount of casting of the lining material.

If the friction force is continuously detected by the lifting force measuring device 10 and the material is not hardened, the lifting force measuring device 10 detects the abnormality, and gradually raises the mold body rising speed and the lining material pouring amount. It responds by changing to.
When the curing of the lining material is fast, increase the ascending speed of the mold body and the pouring amount of the lining material, and when the curing of the lining material is slow, decrease the ascent speed of the mold frame and the pouring amount of the lining material. .

Abnormality detection of curing is determined by the friction force of the lining material and the mold body calculated from the region of the friction force capable of stable construction obtained by a prior confirmation test and the lifting force.
The area of frictional force that can be stably applied is a range where at least the unframed part is self-supporting, the range where the frictional force does not exceed the strength of the construction body, and the curing depth needs to be within a predetermined depth for each material. There is.

Example 1
A lining having a construction thickness of 65 mm was formed on the inner surface of the tundish by the technique of the present invention.

  The refractory material was manufactured using the substances listed in Table 1. The amount added is expressed as a ratio to the refractory material.

  The apparatus used is a movable formwork apparatus for irregular refractory lining shown in FIG. 1 to FIG. 3, the height of the formwork member is 700 mm, and the moving speed of the formwork is variable at 0-50 cm / min, curing. A lifting force measuring device is provided as a determination device.

  A lifting cell was used for the lifting force measuring device, and the lifting force when moving the formwork was measured.

  The refractory material was kneaded with 9.2% by mass of water together with the binder, and exhibited fluidity with a tap flow value of about 230 mm.

  With respect to the weight of the refractory raw material, binder, and water kneaded material, 2.0% by mass of sodium silicate is mixed as a rapid setting material by air immediately before the discharge port, and this is used as a lining material.

  The lining material was poured from four locations and continuously poured into the lining space of the apparatus of FIG. 2 at a casting rate of 60 kg / min per location.

  The lining material has a curing start time of about 80 seconds, and at least the unframed portion is cured, so that the mold body is kept stationary for 90 seconds from the start of the lining material pouring.

  After 90 seconds passed from the start of lining material pouring, the base 4, work base 5, formwork member 6, hydraulic cylinder 7, spring 8, spacer 9, and lifting force measuring device 10 started to rise.

The gantry 4, the work gantry 5, the formwork member 6, the hydraulic cylinder 7, the spring 8, the spacer 9, and the lifting force measuring device 10 were raised together.
The ascending speed was changed as necessary on the basis of 20 cm / min.

  The change is made when the frictional force obtained from the lifting force, which will be described later, needs to be adjusted within the specified value range, and is performed at that timing.

The rising speed of the construction height of the lining material and the rising speed of the construction equipment are monitored, and if necessary, the rising speed of the construction equipment is gradually changed, and the frictional resistance obtained from the lifting force at this time is 2.3 kN The ascent rate was controlled to be less than / m ² . When the frictional resistance exceeds 2.3 kN / m ² , a portion where the friction between the mold member and the lining exceeds the material strength of the lining material appears partially, and the possibility of a crack progressing is increased. This is because it was found in a preliminary test.

  Since the limit value of frictional resistance during operation varies depending on the material, it is determined by prior confirmation tests.

  As a result of continuous construction up to the tundish opening, it was possible to obtain a lining with no joints.

  FIG. 10 is a comparison of the number of microcracks per unit area after passing through the furnace algebra with the new lining of this example and the old lining of the refractory brick structure. Compared with the old lining which has a brick structure, the number of micro cracks generated can be reduced to 60% with the new lining according to the technology of the present invention.

  FIG. 11 compares the results of the erosion test between the new lining of this example and the old lining of the refractory brick structure. Compared to the old lining, the new lining was able to suppress 15% melting damage.

  FIG. 12 shows a comparison of the time taken for the construction between the new lining of this example and the old lining of the refractory brick structure. Compared to the old lining, the new lining reduced the time required for construction by 42%.

(Example 2)
As Example 2, a formwork member support that supports a formwork member of only a corner portion of a quadrangular horizontal cross-section with a tundish as a construction target is a coil spring, and all other formwork member supports are hydraulically operated. The case of a cylinder is shown.

The specifications of the other devices are all the same as those in the first embodiment except for the curing determination device.
As the curing determination device, a needle-like penetration hardness measuring device was installed on the mold member, and the curing was determined by the operator manually measuring the penetration resistance.

Measurement of penetration resistance after pouring was not continuous, but was performed at regular time intervals of every 90 seconds.
The construction thickness and refractory material are the same as in Example 1.

  The lining material was poured from four locations, and the casting was poured into the lining space of the apparatus of FIG. 2 at a predetermined height at a casting rate of 60 kg / min per location, and the casting was stopped.

  After 90 seconds from the start of pouring the lining material, insert an intrusion hardness measuring device into the lining and confirm that an appropriate hardening depth has been obtained. The gantry 4, work gantry 5, formwork member 6, hydraulic cylinder 7 The spring 8, the spacer 9, the penetrating hardness measuring device support member 22, and the penetrating hardness measuring device 23 started to rise to form a new lining space.

  The time interval for determining the curing from the curing start time of the material was set every 20 seconds at which the poured material was cured and could not be joined, and the placement surface was visually observed to check whether the material had fluidity.

  Pouring of material into the newly formed lining space was started, and curing determination and movement were repeated to form a good lining.

  The formed lining exhibited almost the same properties as Example 1.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Mobile type | mold frame apparatus 2 Base 3 Post 4 Base 5 Work base 6 Mold frame member 7 Hydraulic cylinder 8 Spring 9 Spacer 10 Lifting force measuring device 11 Mobile type frame apparatus 12 Base 13 Post 14 Base 15 Work base 16 Type Frame member 17 Hydraulic cylinder 18 Spring 19 Spacer 20 Lifting force measuring device 21 Side pressure or temperature measuring device 22 Penetration hardness measuring device support member 23 Penetration hardness measuring device

Claims (13)

A movable mold apparatus for installing in a cylindrical container and continuously pouring an amorphous refractory into the inner peripheral surface of the cylindrical container for lining,
Column-shaped posts that are erected vertically on the base,
A cylindrical elevator that is fitted into the post and can be continuously moved up and down along the outer peripheral surface of the post;
A gantry having a horizontal cross-sectional shape smaller than the inner peripheral surface size of the cylindrical container, fixed to the cylindrical elevator and capable of continuously raising and lowering together with the elevator,
A plurality of formwork members arranged so as to surround the frame on the outside in the horizontal direction of the frame;
The same number of mold members as the mold members are installed on the gantry, each supporting the mold members, and supporting a plurality of mold members for pressing the mold members against the inner peripheral surface of the cylindrical container. Body,
A curing determination device capable of determining the presence or absence of curing of the lining material located at the lower part of the mold member among the lining material poured into the inner peripheral surface of the cylindrical container;
Have
The mold member is a circumferentially continuous mold frame arranged such that the ends of adjacent mold members are in contact with each other or partly overlapped and separated from the inner peripheral surface of the cylindrical container as a whole. A movable formwork apparatus for an irregular refractory lining characterized by comprising:   2. The amorphous refractory lining according to claim 1, wherein the curing determination device is a lifting force measuring device that is installed on the post or the elevator and measures a lifting force when the elevator is raised. 3. Mobile formwork device.   The said hardening determination apparatus is installed in the said formwork member, It is 1 type, or 2 or more types chosen from the said lifting force measuring device, a side pressure measuring device, a temperature measuring device, and a penetration type hardness measuring device. 2. A movable formwork apparatus for an indeterminate refractory lining according to claim 1.   At the upper part of each of the plurality of formwork members, a distance between the formwork member and the inner peripheral surface of the cylindrical container when each of the formwork members is pressed toward the inner peripheral surface of the cylindrical container. The movable formwork apparatus for indeterminate refractory lining according to any one of claims 1 to 3, wherein a spacer is provided to keep the temperature constant.   5. The spacer according to claim 1, wherein the spacer is detachable, can be replaced with another spacer, and a separation distance between the mold member and the inner peripheral surface of the cylindrical container can be changed. A movable formwork apparatus for an indeterminate refractory lining described in the paragraph.   The irregularity according to any one of claims 1 to 5, wherein each of the plurality of mold members is provided with unevenness on a surface facing the inner peripheral surface of the cylindrical container. A mobile formwork device for fixed refractory lining.   The unshaped refractory lining according to any one of claims 1 to 6, wherein the plurality of formwork member supports are either a cylinder alone or a combination of a cylinder and a coil spring. Mobile formwork device.   The indeterminate refractory according to claim 7, wherein the plurality of formwork members arranged is an even number, and the plurality of formwork member supports are the coil springs every other one. Moving formwork device for lining.   The cylindrical container is a cylindrical container having a polygonal horizontal cross-sectional shape, and supports a formwork member arranged corresponding to a corner of the polygon among the plurality of formwork members arranged. The movable formwork apparatus for an indeterminate refractory lining according to claim 7, wherein the formwork member support is the coil spring.   The movable formwork apparatus for an indeterminate refractory lining according to any one of claims 1 to 9, wherein the elevator has a work base above the base. It is a continuous construction method of an amorphous refractory using the movable form device for the irregular refractory lining according to any one of claims 1 to 10,
The movable formwork device is installed in the tubular container so that the post overlaps the central axis of the tubular container, and the plurality of formwork members are placed at the bottom of the tubular container. Formwork body placement step of placing a continuous formwork body in the circumferential direction, which is pressed against the inner peripheral surface of the cylindrical container by a member support, and arranged as a whole and spaced from the inner peripheral surface of the cylindrical container. When,
A first lining material pouring step for pouring a lining material to a predetermined height into the spaced gap between the inner peripheral surface of the container and the mold body;
Among the poured lining materials, after the curing determination device detects the removal of the deframed portion at the lower part of the mold member, the lining material is continuously poured while the mold body is continuously raised. A second lining material pouring step;
Have
In the second lining material pouring step, the curing determination device continuously detects the curing of the lining material, and continuously adjusts the mold body while adjusting the rising speed of the mold member based on the detection result. A continuous construction method for irregular refractories, characterized in that it is lifted up. It is a continuous construction method of an amorphous refractory using the movable form device for the irregular refractory lining according to any one of claims 1 to 10,
The movable mold apparatus is installed in the cylindrical container, and at the lowest part of the cylindrical container, the plurality of mold members are directed toward the inner peripheral surface of the cylindrical container by the plurality of mold member support members. A mold body placing step of placing a continuous mold body in the circumferential direction, which is pressed and arranged as a whole and spaced apart from the inner circumferential surface of the cylindrical container;
A lining material is continuously poured into the spaced gap between the inner peripheral surface of the container and the mold body, and after the curing determination device detects the curing of the lining material at the lower part of the mold member, the mold A lining material pouring step for moving the frame upward and removing the frame and forming a lining space;
Have
In the lining material pouring step, the curing of the lining material is detected at regular time intervals, the movement of the mold member is determined, and the mold body is intermittently pulled up based on the determination result. A continuous construction method for irregular refractories. The continuous construction method for an irregular refractory according to claim 11 or 12, wherein the lining material is poured while mixing the quick setting material.

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