JP2002097078A - Device for manufacturing ceramic pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for manufacturing ceramic pipes which is a space- saving type, offering low equipment expenses and low fuel consumption. SOLUTION: This device 1 for manufacturing ceramic pipes comprises a heating kiln 2 equipped with a preheating zone 21, a main heating zone 22 and a cooling zone 23 and a pipe handling device 3 which carries a ceramic pipe 7 from an entrance of the kiln 2 to its exit and down below the kiln 2, a gearbox 4 for pipe rotation which travels backward toward the entrance at a predetermined speed and increases a positive rotation speed of the pipe 7 being transported by the device 3 at a faster speed than a predetermined rotation speed which can prevent compression and bending and moves forward toward the exit at a faster speed than the transportation speed of the device 3 and counterrotate the pipe 7 being transported by the device 3 at a faster speed which prevents compression and bending.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic pipe manufacturing apparatus, and more particularly, to a ceramic pipe manufacturing apparatus for continuously firing and manufacturing a cylindrical ceramic pipe such as a sewer pipe or a cable duct. It belongs to

[0002]

2. Description of the Related Art Conventionally, for example, a cylindrical ceramic pipe such as a sewer pipe or a cable duct is formed by placing a ceramic pipe which has been formed and dried before firing on a firing cart in an upright position and firing the same. Batch method of taking out from
It was manufactured by a continuous method in which the dried ceramic pipe before firing was placed vertically on a continuous carriage and fired continuously. The reason why the ceramic pipe is placed vertically on the firing carriage or the continuous carriage is to prevent the ceramic pipe before firing from being flattened or bent when the ceramic pipe has a relatively low mechanical strength when it is turned sideways. However, since it is not possible to completely avoid such inconveniences, flattened or bent parts that cannot be used are cut and only good parts are used as ceramic pipe products.
There was a problem that the yield was poor, and improvement of the yield was desired.

[0003] By the way, when manufacturing a ceramic pipe, there is little possibility that the pipe will be flat or bent even when it is placed sideways, and it is possible to continuously mass-produce a ceramic pipe having an excellent circular cross section. An apparatus for manufacturing a ceramic product is disclosed in, for example, Japanese Patent Publication No. 60-260.
64 (JP-A-54-158416). Hereinafter, an apparatus for manufacturing a cylindrical ceramic product (hereinafter, referred to as a ceramic pipe manufacturing apparatus) according to the above-described conventional example will be described with reference to FIG. 4 schematically showing a kiln for heating a ceramic pipe and a cross section of a kiln for heating a ceramic pipe. The description will be made with the same names and the same reference numerals described in the publication with reference to FIG.

[0004] In the ceramic pipe manufacturing apparatus according to the above-mentioned conventional example, the ceramic pipe 3 before firing, which has been formed and dried by a drier (not shown), is conveyed to a conveying means 2 through a heating furnace 1 by a conveyor (not shown). It is being carried. The heating kiln 1 is provided with a tunnel 7 having a refractory lining, and a heating means such as a burner 8 provided in the tunnel 7 can obtain a favorable temperature distribution along the length direction of the heating kiln 1. It is configured as follows.
The tunnel 7 of the heating kiln 1 and the transporting means 2 moving in the tunnel 7 are gently inclined upward, for example, at 3 °.

The transportation means 2 comprises a heat-resistant carrier 5 and
It has separating push-out members 4 that are arranged with respect to each other. The heat-resistant carrier 5 is formed substantially lower than the extruding member 4 for separation. The heat-resistant carrier 5 and the extruding member 4 for separation are continuously moved in the kiln 1 for heating, and the ceramic pipes 3 are individually separated by the extruding member 4 for separation and transferred in the kiln 1 for heating. The conveying means 2 is configured to maintain the pipe 3 at right angles to the moving direction, and the extruding member 4 for separation and the heat-resistant carrier 5
Are driven synchronously with each other. That is,
The extruding member 4 for separation and the heat-resistant carrier 5 are carried on an endless conveyor chain 9 circulating in the heating furnace 1. The conveyor chain 9 is provided with fixed guides 10 and 11 and is configured to be driven by chain wheels 12 and 12 provided at the entrance and exit of the heating kiln 1.

The heating kiln 1 has three temperature zones: a preheating zone (hereinafter, zone will be referred to as a zone) a, a main heating zone b, and a cooling zone c. In the pre-tropical zone a and the cooling zone c, the ceramic pipe 3 is not rotating,
Extrusion member 4 for separation supported by heat-resistant carrier 5
Are separated from each other. An inclined portion 6 having a surface slightly higher than the upper end of the heat resistant carrier 5 is fixed to the main heating zone b. That is, the ceramic pipe 3 is lifted up by the inclined portion 6 and separated from the heat-resistant carrier 5, pushed by the separating pushing member 4, and rotated on the surface of the inclined portion 6. The rotation of the main heating zone b prevents the flattening and bending of the ceramic pipe 3 and prevents the ceramic pipe 3 from being uniformly heated and fired. Obtainable.

[0007]

According to the ceramic pipe manufacturing apparatus according to the above-mentioned conventional example, a ceramic pipe having an excellent circular cross-sectional shape and excellent quality without bending can be continuously manufactured. Considered excellent. By the way, in such a ceramic pipe manufacturing apparatus, in the main heating zone of the heating kiln, the ceramic of the conveyance means is rotated by a predetermined rotation speed in order to prevent the ceramic pipe from flattening or bending. The transport speed of the pipe is determined, but the ceramic pipe needs to be retained for a predetermined time in the pre-tropical zone of the heating kiln, the main heating zone, and the cooling zone. The total length of the kiln will be decided.

That is, irrespective of the production volume of ceramic pipes, the heating kiln becomes long, for example, 100 m or more, which is disadvantageous in terms of the equipment cost and the installation space of the ceramic pipe manufacturing apparatus. However, there is a problem to be solved that, because of its large volume, the fuel cost increases, and the maintenance cost of the refractory increases, which is disadvantageous in terms of the production cost of the ceramic pipe.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a space saving type and low fuel consumption ceramic pipe manufacturing apparatus with low equipment cost.

[0010]

Means for Solving the Problems To solve the above problems, the means adopted by the ceramic pipe manufacturing apparatus according to the first aspect of the present invention is a method for preheating a molded and dried cylindrical ceramic pipe. A pipe heating means comprising a heating kiln having a main heating zone for firing, and a cooling zone for cooling, and from the entrance to the exit of the heating kiln, for transporting the ceramic pipe placed in a direction orthogonal to the transport direction. In a ceramic pipe manufacturing apparatus comprising: a ceramic pipe being moved to a lower part of the heating kiln at a reverse speed in an entrance direction of the heating kiln, and being conveyed by the pipe conveying means in the main heating zone. Is increased to a predetermined rotational speed or more, and then forwardly moved at a speed higher than the transport speed by the pipe transport means in the exit direction of the heating kiln. Moving in degrees, wherein the ceramic pipe during transportation by said pipe transport means is provided with a pipe rotating speed shifting means for repeating the rotated reversely so that the above predetermined rotational speed.

The means adopted by the apparatus for manufacturing a ceramic pipe according to the second aspect of the present invention has a pre-tropical zone for preheating a formed and dried cylindrical ceramic pipe, a main heating zone for firing, and a cooling zone for cooling. A ceramic pipe manufacturing apparatus comprising: a heating kiln; and a pipe conveying means for conveying the ceramic pipe placed in a direction orthogonal to a conveying direction from an inlet to an outlet of the heating kiln. Moves in the exit direction of the heating kiln at a predetermined forward speed at a predetermined forward speed for a predetermined forward distance, and in the main heating zone, the ceramic pipe being transported by the pipe transport means is rotated at a predetermined rotational speed or higher. Rotating, then moving backward at a predetermined reverse speed in the direction of the entrance of the heating kiln and for a shorter distance than the predetermined forward distance, Ceramic pipes during transportation by is characterized by comprising configured to repeat that reversely rotates so that the above predetermined rotational speed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a ceramic pipe manufacturing apparatus according to a first embodiment of the present invention will be described with reference to FIG. 1 in a longitudinal sectional view showing an overall outline thereof, and FIG. Will be described sequentially.

Reference numeral 1 shown in FIGS. 1 and 2 is a ceramic pipe manufacturing apparatus for manufacturing a cylindrical ceramic pipe 7. The ceramic pipe manufacturing apparatus 1 includes a heating kiln 2 having a configuration described below, which is supported by a row of a support frame 1a having two upright columns.
Inside the ceiling and left and right sides of the heating kiln 2, a lining made of a refractory material is stretched, and on the lower side, a kiln floor made of a refractory material to be described later is provided. further,
The ceramic pipe manufacturing apparatus 1 supports and transports a molded and dried cylindrical ceramic pipe 7 from an inlet 2i to an outlet 2o of the heating kiln 2 in a direction orthogonal to the transport direction. And a pipe rotation speed transmission 4 which is a pipe rotation speed transmission means.

Inside the heating furnace 2, the temperature is controlled so as to have a predetermined temperature distribution by heating by a heating means such as a burner (not shown) in order from the inlet 2i to the outlet 2o of the heating furnace 2. Pre-tropical 21 and main heating zone 2
2 and a cooling zone 23 are formed.

At the lower part of the pre-tropical zone 21, a central movable kiln floor, and at both sides of the central movable kiln floor, a movable movable kiln floor whose one end is close to the inner wall of the heating kiln 2 at a predetermined interval. The movable pre-tropical kiln floor 21a is provided, and the formed and dried ceramic pipe 7 before firing moves from the entrance 2i to the main heating zone 22 while floating from the pre-tropical movable kiln floor 21a. It is to be dried.

In the lower part of the main heating zone 22, a central movable kiln floor for increasing the forward rotation speed of the ceramic pipe 7 and rotating it in the reverse direction is provided, and a predetermined interval is provided on both sides of the central movable kiln floor. There is provided a main heating zone movable kiln floor 22a having one end side and a side movable kiln floor close to the inner wall of the heating kiln 2. The ceramic pipe 7 preheated in the pre-tropical zone 21 is a main heating zone movable kiln floor. The sintering is performed while moving to the cooling zone 23 while rotating forward and reverse at a higher speed on 22a.

A central movable kiln floor is provided below the cooling zone 23, and a side movable kiln floor having one end close to the inner wall of the heating kiln 2 on both sides of the central movable kiln at a predetermined interval. A movable kiln floor 23a made of a high-temperature ceramic pipe 7 fired in the main heating zone 22 is provided.
Is cooled while moving from the movable zone 23a of the cooling zone to the outlet 2o in a state of being lifted.

The pipe conveying means 3 comprises the heating kiln 2
Wheel 31 provided on the inlet 2i side of the vehicle, an outlet wheel 32 provided on the outlet 2o side, and an endless conveyor circulating and moving around the inlet wheel 31 and the outlet wheel 32. And a chain 33.

More specifically, the conveyor chain 33
Are provided in pairs, and each of the conveyor chains 3
3 is supported by a guide roller 33a that rotates a guide rail 36 laid on a rail support member 37. And, this conveyor chain 33 itself,
It is configured to circulate below the heating furnace 2. The conveyor chain 33 has a plurality of mounting brackets 34.
Are protruded at predetermined intervals, and the base end side of the separating push-out member 35 is fixed to each of the mounting brackets 34.

The separating extruding member 35 is provided with a carrier (not shown) for lifting the ceramic pipe 7, and the separating extruding member 35 is provided at the center movable kiln floor and side portions of the pre-tropical movable kiln floor 21a. Between the movable kiln floor, between the central movable kiln floor of the main heating zone movable kiln floor 22a and the side movable kiln floor, and between the central movable kiln floor of the cooling zone movable kiln floor 23a and the side movable kiln floor. And protrudes into the inside of the heating furnace 2 through two parallel slits 2a along the longitudinal direction of the heating furnace 2. On the other hand, the carrier comprises the pre-tropical movable kiln floor 21a and the cooling zone movable kiln floor 2a.
3a and the main heating zone movable kiln floor 22a.
Care is taken not to protrude.

That is, the ceramic pipes 7 are lifted by the carrier, individually separated and pushed by the separating extruding member 35, and are pressed by the pre-tropical movable kiln floor 21a.
Moves without rotating above the main heating zone movable kiln floor 2
It moves while rotating the upper surface of 2a forward and backward, and moves without rotating above the cooling zone movable kiln floor 23a. In the first embodiment, the carrier is
As described above, the separation extrusion member 35 is provided on the separation extrusion member 35, but a configuration in which the separation extrusion member 35 and the separation extrusion member 35 are individually attached to the conveyor chain 33 as in the conventional example may be employed.

At the lower side of the main heating zone 22 of the heating kiln 2, a reverse speed V in the direction of the entrance 2i of the heating kiln 2 is provided.
R, and increases the forward rotation speed so that the forward rotation speed of the ceramic pipe 7 being transported by the pipe transport means 3 is equal to or higher than a predetermined rotation speed capable of preventing flattening or bending of the ceramic pipe 7. Then, the ceramic pipe 7 being transported by the pipe transport means 3 is moved in the direction of the outlet 2o of the heating kiln 2 at a forward speed VF higher than the transport speed of the pipe transport means 3, and A pipe rotation speed transmission device 4 is provided, which is a pipe rotation speed transmission device that repeats reverse rotation of the ceramic pipe 7 so that the rotation speed becomes equal to or higher than a predetermined rotation speed capable of preventing flattening or bending of the ceramic pipe 7.

The pre-tropical movable kiln floor 21 reciprocates on a guide roller 41a provided on the lower cross beam 1b of the support frame 1a.
a, a reciprocating carriage 41 having a main heating zone movable kiln floor 22a and a cooling zone movable kiln floor 23a fixed thereto.

The pipe rotational speed transmission 4 reciprocates by forward and reverse rotation of a guide roller 41a provided on the lower cross beam 1b of the support frame 1a, and moves the pre-tropical movable kiln floor 21a, the main heating zone movable kiln floor. 22a, a reciprocating carriage 41 to which a cooling zone movable kiln floor 23a is fixed is provided.

That is, the movement of the pipe rotation speed transmission 4 toward the inlet 2i of the heating furnace 2 at a certain reverse speed VR causes the ceramic pipe 7 being conveyed by the pipe conveying means 3 in the main heating zone 22. Of the heating kiln 2 in the direction of the outlet 2o at a speed higher than the conveying speed of the pipe conveying means 3 by the forward speed VF. The ceramic pipe 7 being conveyed by the pipe conveying means 3 is configured to be repeatedly rotated in the reverse direction so as to have a predetermined rotation speed or more. The stroke of the pipe rotation speed transmission 4 is preferably set to a length that allows the ceramic pipe 7 to be rotated one or more turns in reverse from the viewpoint of uniform heating.

Of course, a water sealing mechanism 5 having a well-known configuration extending over the entire length of the heating kiln 2 is provided below the heating kiln 2. It is configured such that hot air is prevented from blowing out from a gap formed between the floor and the movable kiln floor.

When firing the ceramic pipe 7 with the ceramic pipe manufacturing apparatus 1 according to the first embodiment,
The pipe conveying means 3 and the pipe rotation speed transmission 4 are operated, for example, as described later. That is, in the pipe conveying means 3, the conveying speed of the ceramic pipe 7 of the conveyor chain 33 is operated at a certain conveying speed V at which the ceramic pipe 7 can stay inside the heating furnace 2 for a predetermined time. The pipe rotational speed transmission 4 can prevent the flattening or bending of the ceramic pipe 7 in the conveying speed V of the conveyor chain 33, the reverse speed VR, the forward speed VF, and the main heating zone 22. The relationship with the required speed VN for rotating at a predetermined rotation speed is as follows: (V + VR) ≧ VN, (VF−
V) It is operated so as to satisfy ≧ VN.

Therefore, according to the ceramic pipe manufacturing apparatus 1 according to the first embodiment, even if the conveying speed V of the ceramic pipe 7 by the pipe conveying means 3 is low, the pipe rotation speed transmission device in the main heating zone 22. When the vehicle 4 is running backward, (V + VR) and the ceramic pipe 7
When the forward rotation speed is increased, the ceramic pipe 7 is rotated backward at (VF-V) and the ceramic pipe 7 is rotated at a predetermined rotation speed capable of preventing flattening or bending. The required speed VN is satisfied.

Thus, in the main heating zone 22, a predetermined rotation speed capable of preventing the flattening or bending of the ceramic pipe 7 can be obtained. The ceramic pipe 7 can be reliably retained in the main heating zone 22 for the required predetermined time. That is, the conveying speed V of the conveyor chain 33 of the pipe conveying means 3 can be set to be lower than the conveying speed of the pipe conveying means of the heating kiln according to the conventional example. Since the entire length of the heating kiln according to the example can be made much shorter than that of the conventional heating furnace, an extremely excellent effect that the cost of the ceramic pipe manufacturing apparatus 1 and the installation space are much more advantageous than before can be obtained. Can be.

Further, as described above, since the entire length of the heating kiln 2 can be made much shorter than the overall length of the heating kiln according to the conventional example, the volume of the heating kiln 2 can be made smaller than before. Can be volume. Therefore, the fuel efficiency for heating is much improved compared to the fuel efficiency of the conventional heating kiln according to the related art, which can greatly contribute to the reduction of the manufacturing cost of the ceramic pipe 7 and also the refractory material. Therefore, there is an economic effect that the maintenance cost is reduced.

Meanwhile, in the ceramic pipe manufacturing apparatus 1 according to the first embodiment, as described above, the upper surfaces of the pre-tropical movable kiln floor 21a and the cooling zone movable kiln floor 23a are separated from the upper surface of the main heating zone movable kiln floor 22a. Also, the case where the ceramic pipe 7 is moved in a state where the ceramic pipe 7 is floated from the movable tropical kiln floor 21a and the movable kiln floor 23a in the cooling zone is described as an example. However, similarly to the case of the main heating zone movable kiln floor 22a, the pre-tropical movable kiln floor 21a and the cooling zone movable kiln floor 23a may be configured to move the ceramic pipe 7 while rotating the ceramic pipe 7 forward and backward. It is.

Further, in the ceramic pipe manufacturing apparatus 1 according to the first embodiment, the entire length of the heating kiln 2 can be made much shorter than the entire length of the heating kiln according to the conventional example. Although the case where all of the kiln floors of the main heating zone 22 and the cooling zone 23 are movable kiln floors has been described as an example, the kiln floors of the pre-tropical zone 21 and the cooling zone 23 are fixed kiln floors, May be used as movable kiln floors.

Next, a ceramic pipe manufacturing apparatus according to a second embodiment of the present invention will be described. However, the second embodiment
Is different from the ceramic pipe manufacturing apparatus according to the first embodiment in that the function of the pipe rotation speed transmission 4 is added to the pipe conveying means without providing the pipe rotation speed transmission 4. The fact that the kiln floors of the pre-tropical zone, the main heating zone, and the cooling zone are all fixed kiln floors, the configuration of the pipe conveying means itself is the same as that of the pipe of the ceramic pipe manufacturing apparatus according to the first embodiment. Since it is the same as the case of the transporting means, the same components are denoted by the same reference numerals with reference to FIG. 3 of a schematic configuration explanatory view of the ceramic pipe manufacturing apparatus, and the differences will be described.

That is, in the ceramic pipe manufacturing apparatus according to the second embodiment of the present invention, the conveyor chain 33 of the pipe conveying means 3 moves at a predetermined forward speed Vf at a predetermined forward speed Vf toward the outlet 2o of the heating kiln 2. Lf is moved, and the ceramic pipe 7 being conveyed by the pipe conveying means 3 is rotated forward in the main heating zone 22 so as to have a rotation speed equal to or higher than a predetermined rotation speed capable of preventing flattening or bending of the ceramic pipe 7. At a predetermined reverse speed Vr in the direction of the entrance 2i of the heating kiln 2 and at the predetermined forward distance Lf.
The ceramic pipe 7 being conveyed by the pipe conveying means 3 in the main heating zone 22 so that the ceramic pipe 7 is rotated at a predetermined rotation speed or more at which the flattening and bending of the ceramic pipe 7 can be prevented. It is configured to repeat the reverse rotation. It should be noted that the short distance L that the conveyor chain 33 of the pipe conveying means 3 moves backward
r is the ceramic pipe 7 from the viewpoint of uniform heating.
Is preferably set to a distance that allows one or more reverse rotations.

Thus, the conveyor chain 33 of the pipe conveying means 3 moves in the direction of the outlet 2o by Lf-Lr = .DELTA.L per forward and backward movement. That is, the ceramic pipe 7 has an average transport speed Va = Δ obtained by dividing ΔL by a required time t per forward and backward movement of the conveyor chain 33.
Although it is conveyed in the direction of the outlet 2o of the ceramic pipe manufacturing apparatus 1 at L / t, it is designed so that it can stay inside the heating furnace 2 for a predetermined time.

When the ceramic pipe 7 is fired by the ceramic pipe manufacturing apparatus 1, the conveyor chain 33 of the pipe conveying means 3 is driven by the forward speed Vf, the reverse speed Vr, and the main heating zone 22 of the conveyor chain 33. In the above, the operation is performed such that the relationship with the required speed Vn for rotating the ceramic pipe 7 at a predetermined rotation speed capable of preventing flattening or bending satisfies Vf ≧ Vn and Vr ≧ Vn.

In the meantime, in the case of the ceramic pipe manufacturing apparatus 1 according to the second embodiment, since the heating kiln 2 is not provided with the pipe rotation speed transmission as described above, the heating kiln 2 is provided with a movable kiln floor. In addition, a fixed kiln floor at the center and side fixed kiln floors having one end contacting the inner wall of the heating kiln 2 at predetermined intervals on both sides of the fixed kiln floor are provided.
Then, the ceramic pipe 7 in the main heating zone 22 is placed on the fixed kiln floor in the center of the main heating zone 22 in the same manner as in the case of the ceramic pipe manufacturing apparatus according to the conventional example. In order to rotate, an inclined member 6 having an inclined portion on both end sides and a flat middle portion between both inclined portions is provided. In addition, it does not matter whether the ceramic pipe 7 is rotated in the pre-tropical zone 21 and / or the cooling zone 23.

According to the ceramic pipe manufacturing apparatus 1 according to the second embodiment, the ceramic pipe 7 is
While being reciprocated in the furnace, it is transported from the inlet 2i to the outlet 2o of the heating kiln 2 at an average transport speed Va (= ΔL / t) of the conveyor chain 33 and stays in the heating kiln 2 for a predetermined time. Will do. In the main heating zone 22, the conveyor chain 33 of the pipe conveying means 3 moves forward and backward so that the ceramic pipe 7 rotates forward or backward at a predetermined rotation speed or higher which can prevent flattening or bending. During the transportation at the average transportation speed Va.

Therefore, according to the ceramic pipe manufacturing apparatus 1 according to the second embodiment, similarly to the ceramic pipe manufacturing apparatus 1 according to the first embodiment, even if the length of the main heating zone 22 is shortened, While securing the specified forward and reverse rotation speed,
During a predetermined time required for firing the ceramic pipe 7,
Since the ceramic pipe 7 can be reliably retained in the main heating zone 22 and fired, the ceramic pipe manufacturing apparatus 1 according to the second embodiment has the same effect as the ceramic pipe manufacturing apparatus 1 according to the first embodiment. There is.

In the above, the heating furnace 2 of the ceramic pipe manufacturing apparatus 1 according to the first or second embodiment is described.
Did not explain the inclination angle of FIG.
And FIG. 3, the entrance 2 of the heating kiln 2
It is inclined so that the exit 2o side is higher than the i side,
The specific inclination angle is set to approximately 3 °, as in the case of the ceramic pipe manufacturing apparatus according to the conventional example.
However, as in the above conventional example, the inclination angle is 0 °,
That is, the heating furnace 2 may be horizontal, or may be inclined so that the inlet 2i side of the heating furnace 2 is higher than the outlet 2o side. In particular, the inclination angle of the heating furnace 2 is limited. Not something. Further, since the ceramic pipe manufacturing apparatus 1 according to Embodiment 1 or 2 is only a specific example of the present invention, a design change or the like of the ceramic pipe manufacturing apparatus 1 without departing from the technical idea of the present invention may be performed. It is free.

[0041]

As described in detail above, claim 1 of the present invention
According to the ceramic pipe manufacturing apparatus according to the above, the ceramic pipe is transported by the pipe transport means, and in the main heating zone of the heating kiln, the ceramic pipe being transported by the pipe transport means is moved in a predetermined direction by the backward movement of the pipe rotation speed changing means. The firing is performed by increasing the forward rotation speed so as to be equal to or higher than the rotation speed, and repeating the reverse rotation so as to be equal to or higher than the predetermined rotation speed by advancing the pipe rotation speed changing means. According to the apparatus for manufacturing a ceramic pipe according to claim 2 of the present invention, the ceramic pipe is transported by the reciprocating pipe transport means at a speed corresponding to the difference in the reciprocating distance, and the pipe is transported in the main heating zone of the heating kiln. The ceramic pipe being conveyed by the conveying means is fired by repeatedly rotating forward while rotating at a predetermined rotational speed or more and reversely rotating so as to exceed the predetermined rotational speed.

Therefore, according to the ceramic pipe manufacturing apparatus according to the first or second aspect of the present invention, the conveying speed of the ceramic pipe can be set to be lower than the conveying speed of the ceramic pipe of the conventional heating furnace. As a result, the overall length of the heating kiln can be made much shorter than in the conventional example, so that there is an effect that the equipment cost and the installation space of the heating kiln are much more advantageous than before. Furthermore, as a result of being able to make the overall length of the heating kiln much shorter than in the conventional example, the volume of the heating kiln can be made smaller than in the conventional example, and the fuel consumption can be much smaller than in the conventional example. The improvement can greatly contribute to the reduction of the cost of manufacturing the ceramic pipe, and also has the economic effect of reducing the maintenance cost of the refractory.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an overall outline of a ceramic pipe manufacturing apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic structural explanatory view of a ceramic pipe manufacturing apparatus according to Embodiment 2 of the present invention.

FIG. 4 is a view schematically showing a heating furnace of a ceramic pipe manufacturing apparatus according to a conventional example.

FIG. 5 is a cross-sectional view of a heating furnace of a ceramic pipe manufacturing apparatus according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ceramic pipe manufacturing apparatus, 1a ... Support frame,
1b lower beam, 2 heating kiln, 2a slit, 2i
... Inlet, 2o ... Exit, 21 ... Pre-tropical, 21a ... Pre-tropical movable kiln floor, 22 ... Main heating zone, 22a ... Main heating zone movable kiln floor,
23: Cooling zone, 23a: Cooling zone movable kiln floor, 3: Pipe conveying means, 31: Inlet side wheel, 32: Outlet side wheel, 33: Conveyor chain, 33a: Guide roller,
34 mounting bracket, 35 extrusion separation member, 36 guide rail, 37 rail support member, 4 pipe rotation speed transmission device, 41 carriage, 41a guide roller, 5
Water seal mechanism, 6: inclined member, 7: ceramic pipe.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiyuki Kitahara 1 Kanazawacho, Kakogawa-shi, Hyogo Shinko Mex Co., Ltd. F-term (reference) 3H111 AA01 BA09 CB14 DA26 DB05 DB17 DB23 EA12 EA18

Claims (2)

[Claims] 1. A heating kiln having a pre-tropical zone for preheating a molded and dried cylindrical ceramic pipe, a main heating zone for firing, and a cooling zone for cooling, from an inlet to an outlet of the heating kiln, In a ceramic pipe manufacturing apparatus comprising a pipe conveying means for conveying the ceramic pipe placed in a direction perpendicular to the conveying direction, a lower part of the heating kiln, at a reverse speed in an entrance direction of the heating kiln. Moving, in the main heating zone, increasing the forward rotation speed so that the ceramic pipe being conveyed by the pipe conveying means is at or above a predetermined rotation speed, and then moving the pipe in the exit direction of the heating kiln. Moving at a forward speed higher than the conveying speed by the means, and reversely rotate the ceramic pipe being conveyed by the pipe conveying means so as to have a predetermined rotation speed or more. A ceramic pipe manufacturing apparatus provided with a pipe rotation speed changing means for repeating the above operation. 2. A heating kiln having a pre-tropical zone for preheating a formed and dried cylindrical ceramic pipe, a main heating zone for firing, and a cooling zone for cooling, from an inlet to an outlet of the heating kiln, In a ceramic pipe manufacturing apparatus comprising a pipe conveying means for conveying the ceramic pipe placed in a direction orthogonal to the conveying direction, the pipe conveying means may be arranged at a predetermined forward speed in a direction of an exit of the heating kiln. The ceramic pipe being conveyed by the pipe conveying means is rotated forward in the main heating zone so that the rotation speed is equal to or higher than a predetermined rotation speed, and then a predetermined reverse speed in the direction of the entrance of the heating kiln. And move backward by a shorter distance than the predetermined forward distance, and reverse so that the ceramic pipe being conveyed by the pipe conveying means has a predetermined rotation speed or more. An apparatus for manufacturing a ceramic pipe, wherein the apparatus is configured to rotate repeatedly.