JPH0694638B2 - Paper dust remover - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for removing paper dust that adheres to and accumulates on a dryer or the like of a paper machine.

[Conventional technology]

As is well known in the art, a paper machine generally comprises a wire section for forming a paper layer, a pressing section for pressing and dehydrating the formed paper layer, a drying section for drying the paper layer, and the like. FIG. 7 shows a schematic configuration in the vicinity of the pressing section and the drying section of this paper machine.

The paper layer W obtained by sending a dilute liquid of the stock material to the wire part and filtering the fiber raw material contained in the liquid is placed on the blanket B which is endlessly transferred from the wire part to form a pair of upper and lower parts. It is squeezed and dehydrated between the rolls 01 and dried by the drum D of a large number of dryers.

In such a paper-making process, while the paper layer W is dried by the drums D of a large number of dryers, paper dust adheres and deposits on the drum surface of the dryer, so that it is held by the doctor holder 02 as shown in FIG. The doctor blade 03 removes the paper dust.

The paper dust removed by the doctor blade 03 is the drum D
Since a large amount is accumulated around the upper part of the doctor blade 03 which is continuously operated for a long time, the paper dust is conventionally removed by obtaining it at regular intervals. As this removing method, a method of removing the paper dust with an electric vacuum cleaner which is generally equipped with a hose having a length reaching the width of the drum D has been adopted.

[Problems to be Solved by the Invention]

By the way, the vicinity of the dryer in the above-described paper machine is hot and humid due to the drying of the paper by the steam sent into the drum of the dryer, and the working environment is extremely severe.

Therefore, according to the conventional method of removing the paper dust adhered and accumulated on the dryer drum under such a severe working condition by the electric vacuum cleaner, the paper dust is scattered and adheres to the peripheral equipment of the dryer to improve the working environment. There is a problem that it becomes bad due to the dust, it is difficult to collect the scattered paper dust, the workability is poor, and the worker must always be arranged in an environment of adverse conditions.

Further, since the accumulated paper dust cannot be completely removed, the paper dust scatters and falls, adheres to the paper layer W, and a defective product is produced.

Therefore, as a method of solving such a problem, the upper surface side of the blade for removing the paper powder adhering to the drum peripheral surface of the dryer is surrounded by a shielding portion, and air is blown against the paper powder collected inside the blade. A paper dust removing device is conceivable in which the dust is blown to the open end of the shielding portion and a dust collecting device is provided at the open end to collect the paper dust from the suction port.

When the above dust collecting device is installed on the dryer, it is necessary to provide a dust collecting pipe and a suction blower for sucking the paper dust from the suction port.

However, while the paper dust is sucked and collected by such a dust collector for a long time, the dust collecting pipe may have a confluence point of dust collecting pipes arranged for respective drums of a plurality of dryers or the like. Paper powder adheres to and accumulates at the bent portion, causing clogging of the pipe. Therefore, in order to prevent such clogging of the pipe, it is desirable to provide the dust collecting pipe with a cleaning means using a cleaning liquid.

Further, in order to reuse the removed paper dust as pulp, it is desirable to provide a dust collecting tank.

The present invention has been made in view of the current state of the art of removing the paper dust adhering to the dryer of the conventional paper machine as described above, and its first object is to shield the paper dust peeled off by the doctor blade. A device that collects the dust inside the unit and automatically collects it is provided, and a means that can wash the paper dust accumulated in the dust collector is provided to prevent the scattering of paper dust and improve the working environment.
An object of the present invention is to provide a paper dust removing device that automates dust collection work and prevents deterioration of product quality due to paper dust.

A second object is to provide a paper dust removing device in which paper dust removing device is provided with a dust collecting tank into which a common dust collecting pipe of the dust collecting device is introduced so that the paper dust can be reused as pulp. There is.

[Means for Solving the Problems]

As a means for solving the above first problem, in the present invention, a doctor blade having a width corresponding to the drum width is arranged so as to face the moving peripheral surface of the rotating drum, and a shielding portion that surrounds the upper surface side of the doctor blade is provided. At least one side end of the shielding portion in the width direction is opened so that the paper dust collected inside can be sucked freely from the open end, and the suction port of the dust collecting tube is adjacent to the open end of the moving peripheral surface. An air pipe having a plurality of nozzles whose outlets are directed toward the suction port of the dust collecting pipe is provided in the shielding part, and the dust collecting device is provided with the suction port. A paper dust removing device comprising at least one system of dust collecting pipes connected to the above and a suction device connected to the dust collecting pipes via a common pipe, the common pipe being provided with a cleaning means for feeding a cleaning liquid from the upstream side thereof. This is the structure adopted.

Further, as a means for solving the second problem, a configuration of a paper dust removing device provided with a dust collecting tank into which a common pipe connected to the suction device is introduced is adopted for the above solving means.

[Action]

In the paper dust removing device of the first invention, when the moving peripheral surface continuously moves, the paper dust attached to the outer peripheral surface is removed by the doctor blade and collected in the shielding portion. Then, the paper dust is gathered to one side by the air blowing part and sucked by the dust collector.

The air blowing and suctioning operations are performed by performing suctioning operations at regular time intervals for a predetermined time, and during the suctioning operation time, the air blowing operation is performed for a short time to collect dust.

During the action of collecting dust at regular intervals, the paper dust accumulated in the dust collecting pipe of the dust collecting device is washed by feeding the washing liquid by the washing means during the suspension period of the dust collecting action.

In this way, all the operations of removing paper dust, dust collection, and cleaning are automated, the working environment is improved, and dust can be collected efficiently.

In the second invention, the removed paper dust is collected in the dust collecting tank in which the common dust collecting pipe path of the dust collecting device is introduced, and is reused as the paper raw material again.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an overall schematic view of a state where the paper dust removing device according to the present invention is provided for a dryer of a paper machine. This paper dust removing device includes a paper dust removing unit, a paper dust collecting unit, and a dust collecting tank unit.

Therefore, first, the details of the paper dust removing unit and the dust collecting unit will be described with reference to FIGS.

As shown in FIG. 3, the paper dust removing unit includes a doctor blade 1 provided facing the drum D of the dryer, and a shielding unit 6 surrounding the upper surface side of the blade.

The doctor blade 1 is attached to a blade holder 2, and the holder 2 is supported by a support member 3, and the support member 3 is fixedly supported on the ground side by an appropriate fixed support portion. Reference numeral 4 denotes a rotary shaft fixed to the support member 3, and the support member 3 is rotatable around the rotary shaft 4. Reference numeral 5 is an air tube as an angle adjusting member for adjusting the set angle of the doctor blade 1 with respect to the outer peripheral surface of the drum.

With respect to the doctor blade 1, as shown in FIG.
Is provided so as to surround the doctor blade 1.
The shield portion 6 is provided with a shield plate 7 provided on the upper surface side and a skirt portion 8 connected to the tip thereof in order to prevent paper dust collected mainly on the upper surface side of the doctor blade 1 from scattering. It consists of another skirt 9.

Both ends of the shielding portion 6 are formed as open ends in the illustrated example.

The doctor blade 1 and the shield 6 are provided on a part of the peripheral surface of the dryer D over a length corresponding to the width of the drum D.

The dust collecting unit includes an air blowing unit 10 that blows air onto the paper powder in the shielding unit 6 to collect the paper powder at the drum end, and a dust collecting device 20 that sucks the paper powder at the drum end.

The air spraying unit 10 is provided with air nozzles 12 at appropriate intervals on an air pipe 11 provided in the shielding unit 6 along the width direction of the drum.
A plurality of solenoid valves are provided, and an electromagnetic valve 13 is provided on the inlet side pipe of the air pipe 11, and a compressor 14 as an air supply device for sending air is further provided upstream thereof.

As shown in FIG. 5, the air pipes 11 respectively arranged in the plurality of drums D are connected to the common pipe 15 upstream of the position where the solenoid valve 13 is provided, and the air is supplied by the common compressor 14. It

The tip of the air outlet of the air nozzle 12 is entirely directed to the left in the figure as shown in FIG. 4, and the air blown from the nozzle 12 blows the paper dust to the suction side.

In this embodiment, at least one end of the above-mentioned shield 6 may be open (both ends may be open).

The dust collecting device 20 provided adjacent to the open end of the shielding portion 6 has a solenoid valve 23 in the path of the dust collecting pipe 22 to which a spreading suction pipe 21 as a suction port is connected at the tip, and the outlet is common. It is connected to the dust collecting pipe 24, further provided with a suction blower described later downstream thereof, and equipped with a cleaning pump 26 upstream through an electromagnetic valve 25 (see also FIG. 1).

As shown in FIG. 1, a dust collecting tank 30 and a filtering means 40 are provided in the path of the common dust collecting pipe 24 of the dust collecting device 20.

As shown in FIG. 2, the dust collection tank 30 has a common dust collection pipe 24 connected to a tank head 32 provided on an upper portion of the tank body 31 in a tangential direction of its outer periphery, and a level sensor 33 is connected to the tank body 31. , An agitator 34, and a suction pump 35.

The level sensor 33 is composed of a sensor for detecting three liquid level levels of high, medium and low as shown in the figure. The agitator 34 drives the motor to rotate the impeller at the tip of the shaft to stir the liquid. The suction pump 35 is driven by a motor to suck the liquid containing the paper powder in the tank body 31 for a predetermined time at regular intervals and send it to a tank for storing the paper raw material for reuse.

In the tank head 32 of the tank body 31, one end of the connecting dust collecting pipe 24 'is inserted into the tank head 32 through the tank head 32 to a predetermined depth position. The other end of the connecting dust collecting pipe 24 'is connected to the filtering means 40.

The filtering means 40 comprises a filter 41 for removing fine particulate paper powder provided in a filter body 42, and a suction blower 43 is provided downstream thereof.

The paper dust removing device of this embodiment configured as described above operates as follows.

In the process of producing paper by continuously operating the paper machine, when the drum D of the dryer rotates along with the feeding of the paper layer, the paper dust adhering to the peripheral surface of the drum D is not covered with the paper layer. It is peeled off by the doctor blade 1 of the paper dust removing portion provided on the peripheral surface of the.

The stripped paper dust is collected on all the sub-elements of the drum D,
Collected in a space surrounded by the shield 6 on the upper surface of the doctor blade 1. Since the paper dust thus collected is shielded by the shielding portion 6, it is prevented from scattering to the outside.

The paper dust is collected by the dust collecting unit provided for the paper dust removing unit as follows.

Prior to starting the paper dust collecting action, first, the air spray part
The compressor 14 of 10 and the suction blower 43 of the dust collector 20 are activated. The solenoid valves 13 and 23 remain closed.

As described above, when the drum D of the dryer is continuously rotated and the paper dust is removed by the doctor blade 1, the paper dust is collected in the shielding portion 6.

Therefore, the electromagnetic valve 23 of the dust collector 20 is opened so that the dust collector can suck the paper dust. Then, within a short time, the solenoid valve 13 of the air blowing unit 10 is opened, air is blown from the air nozzle 12, and the paper dust is sent to the suction side. When suctioned for a predetermined time, the solenoid valve 13 is closed, and then the solenoid valve 23 is closed within a short time.

As described above, the dust collector 20 is installed on each drum D ₁ , D of the dryer.
One set is provided for each of ₂ , ₂ , and ₃ ... Therefore, the above-described dust collecting and removing action is performed on the solenoid valves 13 and 23 of one set of dust collecting devices, and after a certain period of time, the dust collecting and removing actions are similarly performed by the other dust collecting devices to sequentially perform the action of each set. repeat.

When the paper dust removal and dust collection actions are completed for all the dryers, the above actions are repeated again after a predetermined time to efficiently and automatically remove the paper dust.

Although the dust collector described above acts sequentially for each set of drums of each dryer, it may be made to act sequentially for every two sets and every three sets, for example. In this case, as shown in FIG. 1, each system of the dust collecting tube 22 provided with one solenoid valve 23 may be electrically operated every two groups or three groups, or each group may be operated sequentially. Alternatively, one set of solenoid valves may be provided for every two sets and three sets of the system, and this may be connected to the common dust collecting pipe 24.

While the above paper dust removal and dust collection operations are being performed in sequence, the common dust collection pipe 24 of the dust collection device 20 and the common dust collection pipe 24 of each dust collection pipe 22
Paper powder may accumulate around the area, causing clogging.

Therefore, the cleaning pump 26 is driven at regular intervals and the solenoid valve 25
Open and send clean water as a cleaning liquid to clean the inside of the pipe. The liquid obtained by washing the paper powder with this fresh water is stored in the tank body 31 of the dust collection tank 30.

The above-described cleaning action with fresh water is performed every several cycles of removing paper dust and collecting dust with respect to all of the plurality of drums. Therefore, during normal paper dust removal and dust collection operations, the dust collection tank 30 provided in the middle of the common dust collection pipe 24
The paper dust contained in the air collected in is removed as follows.

The dust collecting air sent from the common dust collecting pipe 24 to the dust collecting tank 30 flows into the tank head 32 from the tangential direction of its outer peripheral portion, so that it descends while swirling inside like a cyclone, and the tank head 32 When going down further, the tank body
Turn into 31 while spreading.

During this flow-diffusion, the paper dust hits the inner wall of the tank body 31 because it has a higher specific gravity than air, and falls into the liquid in the tank along the inner wall, and this liquid containing the paper dust is operated by the suction pump 35. It is sent to the papermaking material department and reused as a material. Thus, most of the paper dust is removed by the dust collection tank 30.

However, the excess paper powder in the form of fine particles contained in the dust collecting air cannot be completely removed yet. Therefore,
The air sucked by the suction blower 43 is sent to the next filtering means 40 through the connecting dust collecting pipe 24 'while containing fine paper powder.

In the filtering means 40, the fine paper powder is removed by the filter 41. The removed paper dust is cleaned by periodically removing the filter 41.

Incidentally, FIG. 6 shows an outline of a modified embodiment of the filtering means.
(A) consists of two sets of suction blowers 43 provided independently of each other, and (b) consists of two sets of filtering means sucked by a common suction blower 43. 44 and 45 are solenoid valves.

In either case, when the filter of one of the filtering means is replaced, suction and filtering operations are performed by the other filtering means of the other set, and the filtering operation can be continuously performed without stopping.

If the dust collection tank 30 can completely remove the paper dust, the filtering means 40 may not be provided.

〔effect〕

As described in detail above, according to the first aspect of the invention, it is possible to automatically and efficiently collect dust while preventing the scattering of paper dust, prevent the deterioration of the work environment and the quality of the product, and make the piping of the dust collecting device visible. Can prevent clogging. Further, the second invention has an advantage that the removed paper powder can be reused as a paper raw material again.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a paper dust removing device according to the present invention, FIG. 2 is a detailed view of a dust collecting tank and a filtering means, FIG. 3 is a main sectional view of a doctor blade and a shielding portion, and FIG. 4 is air blowing. Sectional view showing the structure of the suction part of the dust collecting device, FIG. 5 is a plan view of the device of FIG. 3 and FIG. 4 installed in a dryer, and FIG. 6 is a schematic view of a modified embodiment of the filtering means. FIG. 7 and FIG. 7 are schematic views in the vicinity of a dryer of a conventional paper machine, and FIG. 8 is a partially enlarged view in the vicinity of a doctor blade. 1 ... Doctor blade, 6 ... Shielding part, 10 ... Air spraying part, 11 ... Air piping, 12 ... Air nozzle, 13, 23 ... Solenoid valve, 20 ... Dust collector, 21 ... Expansion Open suction pipe, 22 …… Dust collection pipe, 24 …… Common dust collection pipe, 24´ …… Connection dust collection pipe, 30 …… Dust collection tank, 31 …… Tank body, 40 …… Filtration means, 41 …… Filter, 43 ... Suction blower.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuzo Kashino 3-5-12 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Rengo Co., Ltd. Head office (56) Reference JP-A-63-315692 (JP, A) Actually open 60-78899 (JP, U) Actually open 4-60597 (JP, U) Actually open 60-18480 (JP, Y2)

Claims (2)

[Claims] 1. A doctor blade having a width corresponding to the drum width is arranged so as to face the moving peripheral surface of a rotary drum, and a shield portion surrounding the upper surface side of the doctor blade is provided, and at least one side end in the width direction of the shield portion is provided. The paper dust collected inside is made open so that it can be sucked from the open end, and the suction port of the dust collecting pipe is provided adjacent to the open end of the moving peripheral surface to collect the paper dust. In the shielding part, an air pipe having a plurality of nozzles whose air outlets are directed in the direction of the suction port of the dust collecting pipe is arranged,
The dust collector is composed of at least one system of dust collecting pipes connected to the suction port and a suction device connected to the dust collecting pipes via a common pipe, and a cleaning means for feeding a cleaning liquid from the upstream side to the common pipe. A paper dust removing device provided. 2. The paper dust removing device according to claim 1, further comprising a dust collecting tank into which a common pipe connected to the suction device is introduced.