JP4715983B2 - Bag filter for powder processing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to various particle processing devices such as a surface modification device, a pulverizer, a mixer, a kneader, a granulator, a feeder, a dryer, etc., provided in a box structure such as a clean box. It relates to a bug filter provided for use.
[0002]
[Prior art]
In recent years, when processing granular materials such as pharmaceuticals (raw materials), a box like a clean box of a size suitable for the purpose of processing, not in a closed clean room building, to prevent contamination by foreign substances Various types of powder processing apparatuses have been housed in structures and operations have been performed.
Many of the granular materials processed in such a box structure are expensive, such as pharmaceuticals (raw materials), and their handling is assumed to be small and diverse. The frequency of switching increases, and there is a situation where usability is required to perform assembly, disassembly and cleaning operations of the processing chamber each time.
On the other hand, these powder processing apparatuses are provided with a bag filter for collecting, collecting, etc., the processed powder, and a casing constituting the bag filter in accordance with the cleaning operation of the processing chamber. It is necessary to clean the inside and the filtering means such as bag cloth installed therein.
[0003]
By the way, the conventional cleaning operation for the filtering means or the like is performed by opening an opening / closing cover provided in a maintenance opening formed in the casing. However, the bag filter is disposed outside the box structure. Because it was installed in the vicinity, the internal environment of the box structure and the internal environment of the casing, which had been kept synchronized, were damaged during the work, and after the work was completed and the open / close cover was closed, the two were synchronized again. The adjustment work that is necessary is forced, and not only the total work time required for switching the processing raw material is lengthened, but also the case where the material adhering to the bag cloth cannot be recovered as a product when the raw material is expensive. As a result, the product recovery rate is reduced, which increases the overall manufacturing cost. Moreover, this cleaning operation is performed, for example, by spraying various solvents that dissolve the processed product. However, the cleaning solvent is scattered and reacts with impurities in the outside air. In some cases, the raw material to be processed and the solvent used may be harmful to the human body. In addition, there will be problems with the recovery of the solvent and the drying of the equipment, and there will be restrictions on the raw materials that can be processed using a clean box. It was a factor that let me.
[0004]
Further, the maintenance opening is formed by fitting a box-shaped opening frame to a cylindrical casing to form a flat surface as a whole, and a so-called hinged door mechanism in which the opening / closing cover is attached to the opening frame. Because it is suspended, when the opening / closing cover is subjected to surface pressure by interposing a packing member provided on the four-sided frame, it is simply pressed against the smooth surface by rotating the operation handle (locking handle). Although there is an advantage that can be achieved by a simple surface pressure configuration that only allows the door to open, the hinge member on the suspension side is used as a fulcrum, so a space equivalent to the width of the opening and closing cover is required on the front of the opening. There is a drawback that it is impossible to deal with such a situation where it is difficult to secure the space due to the arrangement relationship with the individual devices to be configured.
[0005]
[Problems to be solved by the invention]
The present invention was devised to eliminate the problems as described above, and is a box structure such as a clean box. Inside Although it is a bug filter used for cleaning, the synchronization between the environment of the box structure and the processing equipment and the internal environment of the bag filter is not impaired during maintenance work such as cleaning, and the synchronization of the environment of both is not impaired. Can be made unnecessary, The open / close cover can be opened / closed along the cylindrical outer peripheral surface of the casing, and the opening / closing cover can be opened and closed with an arcuate movement trajectory. In addition to minimizing the open door space, the internal cleaning work is easy to perform, and it is easy to secure a structure that can be opened and closed on either side, making it easy to clean the inside of the open / close cover. It can also be stored in a box structure where it is difficult to secure a work space, such as a clean box with arm gloves for maintenance. It aims at providing the bug filter of a granular material processing apparatus.
[0008]
[Means for Solving the Problems]
The technical means employed by the present invention in order to solve the above problems is a bag filter constituted by a casing in which predetermined filtering means is disposed and an opening / closing cover is provided in the maintenance opening. , The bug filter The casing is formed into a cylindrical shape In the box structure With storage The opening / closing cover In the box structure To enable opening / closing operation And a sliding door mechanism that opens and closes along the outer peripheral surface of the casing. It is characterized by that.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the embodiment of the present invention will be described in detail based on a bag filter of a granular material processing apparatus exemplified as a preferred embodiment.
In FIG. 1 to FIG. 7, reference numeral 1 denotes a frame-like gantry with casters, to which a clean box 2 and an impact pulverizer 3 as a granular material processing apparatus are integrally attached. The pulverizer 3 treats the granular material inside the clean box via an L-shaped frame plate 21 as a mounting structure constituting a part of the outer wall portion of the clean box 2 provided with a predetermined opening. The chamber (pulverization chamber) 31 is integrally mounted so that the drive mechanism 32 is provided outside the chamber 31 and the airtightness inside and outside the clean box is maintained through predetermined sealing means. The drive mechanism 32 is fixed to the L-shaped frame plate 21.
The clean box 2 has operation units 22, 23, and 24 that are configured to be openable and closable on the front and back surfaces of the clean box 2, and an automatic supply device 4 for quantitatively supplying the raw material to the processing chamber 31 on one side. An air lock 51, an operation panel 6 and an exhaust filter 52 at the other side, a raw material supply container (raw material hopper) 71 at the top, and a discharge chute 72 for collecting and discharging the pulverized product at the bottom. Each is provided. A recovery container 73 is connected to the lower portion of the discharge chute 72 via a split butterfly valve so that the pulverized product can be recovered without being in contact with air outside the system and sealed. Left and right arm gloves 221, 221 for inserting a hand into the operation units 22, 23, and 24 to supply raw materials, perform processing chamber 31, and maintain a bag filter 8 (to be described later). 231 and 231 and 241 and 241 (upper and lower two places) are provided.
[0010]
The automatic supply device 4 includes a supply unit 41 and a drive unit 42 as supply means, each of which is a connecting means, for example, an inner magnet and an outer magnet having a multipolar structure arranged with a partition wall sealing the inside and outside of the box 2 interposed therebetween. By adopting a so-called magnet coupling mechanism or the like that is configured to be driven and transmitted according to the relationship between the supply container 71, the raw material from the supply container 71 is received by the pipe 413, and the supply pipe 414 It is supplied to the processing chamber 31.
The supply unit 41 is configured by a screw feeder, and includes a screw shaft 411 that transfers a raw material supplied from the supply container 71 to the connected processing chamber 31, and is attached to an inner wall of the box 2. Are connected to each other by a clamp 412a, and can be easily detached from the inside of the box by tightening and loosening the clamp 412a. Reference numeral 413a denotes a clamp that couples the supply container 71 to the main body of the supply section 41. Reference numeral 414a denotes a clamp that couples the main body of the supply section 41 and the processing chamber 31. The supply section 41 can be arbitrarily disassembled at these joint portions.
The automatic supply device 4 may employ a rotary valve or a table feeder instead of a screw feeder, and may employ a joint mechanism having a general concave-convex fitting configuration instead of a magnet coupling mechanism that is a linking means. In short, it is only necessary to have a configuration in which the quantitative supply can be performed properly and can be arbitrarily attached and detached during the cleaning operation inside the box.
[0011]
The exhaust port 834 of the vacuum filter 8 is connected to a suction blower (both not shown) through a pipe. When pulverization is performed in this apparatus, the rotor is rotated at a constant rotation number in advance, and the suction blower is operated, so that a predetermined air volume equal to or greater than the air volume generated by the rotation of the rotor is obtained from the processing chamber 31. Suction. The raw material charged into the processing chamber 31 is pulverized by a momentary impact action by a large number of impact pins and the like provided on the rotor and the front cover, respectively, which rotate at high speed. Is discharged through the discharge pipe 311 and separated into an air stream and a pulverized product (powder) in the bag filter 8, and the air stream is discharged out of the system from the discharge port 834 through a suction blower. Is recovered in a recovery container 73 via a discharge chute 72 and a double damper.
[0012]
The bag filter 8 is formed by a cylindrical casing 81. A head cover 811 is attached to the upper opening of the bag filter 8 so that it can be opened and closed. A bag cloth 82 formed on the side surface of the casing 81 is attached and detached, and the inside of the casing 81 is cleaned. An opening / closing cover 812 is provided in an opening / closing portion 812a for performing maintenance such as work, and the appearance of the head cover 811 portion above the flange portion 813 is exposed to the clean box 2 and the opening / closing portion below the flange portion 813 is exposed. The cover 812 is housed inside the box 2 and attached. The inside of the casing 81 is partitioned into an upper chamber 841 and a lower chamber 842 by a partition plate 84 having four retainer mounting holes 84a drilled therein, and a retainer and a cylinder fitted and attached to the lower chamber 842 side. A predetermined filtering means such as a bag-shaped bag cloth 82 is provided. The retainer and the bag cloth 82 are detachable.
Two header pipes 83 for storing a certain amount of compressed gas are attached to the upper portion of the head cover 811 via a pipe 831. Four backwash nozzles 833 arranged in the casing 81 are attached to the other end of the pipe 831. The compressed gas in the header pipe 83 is instantaneously ejected to adhere to the bag cloth 82. The body is made to peel off. The compressed gas discharged from the exhaust port 834 is ejected by opening and closing a solenoid valve 832 provided in the middle of the pipe 831. The head cover 811 is opened and closed by operating the clamp handle 811a, and the solenoid valves 832 are operated at different times.
[0013]
In addition, the opening / closing cover 812 is formed with a curved surface substantially matching the curvature of the casing 81, and with respect to the rail body 85 provided endlessly along the entire circumferential surface of the casing 81 above the opening 812 a. The opening / closing cover 82 is configured by a hanger-type sliding door mechanism that supports a traveling body 86 provided via a suspension shaft 861 on the upper end portion of the opening / closing cover 82 and is suspended on both the left and right sides. The traveling body 86 may be any shape such as a semicircular shape or a plate shape, and may be a roller or the like.
The rail body 85 is configured by two rail members having a substantially circular cross section arranged side by side with a predetermined interval, and is attached to the casing 81 by a downward U-shaped rail bracket 851. The traveling body 86 is formed as a sphere larger than the interval between the rail members, and is attached to suspension brackets 862 and 862 protruding from the right and left upper edges of the opening / closing cover 812 via a suspension shaft 861, and the rail member. It is supported by being suspended and slidable between them.
The suspension shaft 861 has a bolt groove portion screwed on the lower side thereof fitted into a long hole drilled in the front-rear direction of the suspension bracket 862, and a nut to which an operation lever 863 is integrally coupled. 863a and cap nut 863b are connected to each other, but the open / close cover 812 is loosened by the tightening operation of the operation lever 863 when the door is closed, and the cover handle 812c is gripped to move or swing in the front-rear direction. The nut 863a is tightened and opened and closed when the door is opened. If the cap nut 863b is removed, the suspension shaft 861 can be easily detached from the suspension bracket 862, and the opening / closing cover 812 can be removed.
[0014]
On the other hand, an airtight material pocket 871 having a concave cross section with a packing rubber 87 as an airtight material is provided around the four peripheral edges of the opening 812a, and the opening / closing cover 812 is interposed via the packing rubber 87. These four peripheral edges are subjected to surface pressure by surface pressure means provided at the left and right end portions of the opening / closing cover 812 so as to be closed. That is, the surface pressure means has an adjustment fastener 8 at the tip. 8 1 and a pair of band bodies 88 formed of a metal band body having a connecting shaft 882 at the base end portion. The connecting shaft 882 is connected to the upper and lower ends of the left and right end portions of the opening / closing cover 812. The connecting cylinder 812b provided at the location is pivotally attached when the door is closed, and the band body 88 is tightened to attach the opening / closing cover 812 from both side edges in the circumferential back direction of the casing 81. A surface pressure closed door state is secured, and it is removed as necessary, such as when the door is opened. The band body 88 is formed of a stainless steel metal band, but is not limited to this, and may be made of any material such as cloth or resin.
[0015]
When cleaning the inside of the clean box 2, for example, various solvents that dissolve the processed product are sprayed from a cleaning liquid spray device (not shown) disposed in the box 2, and the waste liquid is discharged at the bottom of the clean box 2. Drain from the exit. After cleaning, the inside of the clean box 2 is quickly dried by continuously supplying and discharging N 2 gas into the clean box 2 as in the process.
When cleaning the inside of the processing chamber 31 and the supply device 4, the supply container 71 is rotated in a state where the rotor and the screw shaft 411 are rotated at a low speed while supplying the sealing gas (N 2 gas) continuously as in the processing. The same solvent as above is supplied, and the waste liquid is recovered in the recovery container 73 via the discharge pipe 311, the discharge chute 72 and the split butterfly valve. By continuously supplying (and discharging) the N 2 gas, not only the inside (each component member) of the processing chamber 31 but also the discharge pipe 311 and the discharge chute 72 can be quickly dried.
For further strict cleaning, the clamps 412a, 413a and 414a are removed, the pipe 413, the supply pipe 414 and the supply device 4 are removed, and then the rotor, shaft, stator and casing constituting the discharge pipe 311 and the processing chamber 31 are removed. The cleaning operation is performed by disassembling each component such as a collar and taking it out inside the clean box 2 or outside and cleaning and drying it.
[0016]
When cleaning the inside of the bag filter 8, first, the adjustment fastener 8 is used. 8 1 is dissociated to loosen the band body 88, and the connecting shaft 882 inserted in the connecting cylinder 812b is removed to remove the band body 88. Next, the cover handle 812c is gripped, the opening / closing cover 812 is pulled forward, the operation lever 863 is operated, the nut 863a is tightened, the suspension shaft 861 is firmly fixed to the suspension bracket 862, and the opening / closing cover 812 is fixed. Open the door. This door opening operation is performed not only during the cleaning operation but also when collecting the powder adhered to the inner surfaces of the bag cloth 82 and the casing 81 and when attaching or detaching the bag cloth 82. Thereafter, when the inside is cleaned using a cleaning liquid spray hose (not shown) disposed in the box 2 and the inner surface of the opening / closing cover 812 is cleaned, the left and right sides are half opened, and the cleaning liquid is used using the opening 812a. Spray, wash and dry.
In the case of performing a large-scale maintenance work such as when cleaning is performed more strictly, the cap nut 863b is removed, the suspension shaft 861 is detached from the suspension bracket 862, and the opening / closing cover 812 is removed. The assembly and closing operation of the opening / closing cover 812 is performed by reversing these procedures.
[0017]
In the embodiment of the present invention configured as described, maintenance work such as cleaning of the inside of the bag filter 8 and replacement of the bag cloth is performed. Formed by a cylindrical casing 81 Bug filter 8 The In the clean box 2 With storage The opening / closing cover 812 In the clean box 2 as a box structure To enable opening / closing operation And a sliding door mechanism that opens and closes along the outer peripheral surface of the casing 81. So clean box 2 Inside Although the bag filter 8 is used for cleaning, the synchronization between the internal environment of the box 2 and the crusher 3 and the internal environment of the bag filter 8 is not impaired at the time of maintenance work such as cleaning. You can make any adjustment work unnecessary, The opening / closing cover 812 can be opened / closed along the cylindrical outer peripheral surface of the casing 81 of the vacuum filter 8, For example, even if the processing materials are frequently switched, and even when the usability of assembling, disassembling and cleaning the processing chamber 31 is required each time, a quick cleaning operation can be performed together with these operations, the productivity efficiency may be impaired. In addition, the overall labor savings such as workability and cost can be achieved, and it is possible to reliably prevent the cleaning solvent from splashing and reacting with impurities in the outside air, and the solvent recovery and equipment drying can be performed properly. There are no restrictions on the raw materials that can be processed.
Moreover, since the clean box 2 is provided with maintenance arm gloves 231 and 241 on the opening / closing cover 812 side and on the back surface or side surface thereof, the opening / closing operation of the opening / closing cover 812 or the attaching / detaching operation of the band body 88 is performed. The tightening or detaching operation and the cleaning operation can be performed very efficiently while maintaining the environment in the box 2 as in the assembly, disassembly and cleaning operations of the processing chamber 31.
Furthermore, a fixed quantity supply device 4 for supplying a raw material supplied from an external supply container 71 to the processing chamber 31 is built in the clean box 2, and the raw material processed in the processing chamber 31 is also the same. Since it is configured to be discharged through the bag filter 8 stored inside the box 2, it is possible to provide a clean box structure in which the processing chamber 31, the supply device 4, and the bag filter 8 are integrated and unified. As a result, the box structure itself can be provided as a granular material processing apparatus that is systematized.
In addition, although the said casing 81 was comprised as the thing of the bag filter 8 single-piece | unit, it is not limited to this, You may make it store integrally with the outer wall of the clean box 2. FIG.
[0018]
In addition, the opening 812a is formed in a curved opening surface along the shape of the cylindrical casing 81, and the opening / closing cover 812 is surface-pressure-closed through the packing rubber 87 in the four peripheral surface areas of the opening 812a. The opening / closing cover 812 is configured to be closed by a band body 88 as a surface pressure means that is attached to both sides of the opening / closing cover 812 in the circumferential back direction of the casing. A box-shaped opening frame is unnecessary, and the projecting space occupied by the frame can be effectively used as a space for moving the opening / closing cover 812 in the front-rear direction, for example, and the maintenance opening 812a is formed on a curved surface. In addition, the open / close cover 812 that contacts the curved surface can be closed evenly by applying pressure to the open / close cover 812. If one or a bag filter 8 the door mechanism is of compact, simply obtained employing those removable that open configuration, it is possible to arrange in the box structure secure space is difficult, such as the clean box.
In addition, the surface pressure means includes the band body 88 and the adjustment fastener 8. 8 Therefore, the surface pressure can be evenly applied by a simple operation of winding the hand body 88 simply by determining the closing position of the opening / closing cover 812. In this case, the surface pressure does not need to be strong. That is, by operating the suction blower, the inside of the vacuum filter 8 becomes negative pressure, and the opening / closing cover 812 is sucked into the opening 812a to ensure uniform surface pressure. Therefore, a strong surface pressure is not required.
The opening 812a is formed on the curved opening surface. However, the opening 812a may be formed on the bending opening surface to form an opening / closing cover having a corresponding shape, and the size thereof is arbitrary. Further, the surface pressure means is not provided with the band body 88, and the adjusting fastener 8 8 1 may be provided on the opening / closing cover 812 and the casing 81.
[0019]
Further, since the opening / closing cover 812 is constituted by a hanger-type sliding door mechanism that opens and closes along the outer peripheral surface of the casing 81, the opening / closing cover 812 can be opened and closed along the outer peripheral surface of the casing 81. As a matter of course, the opening / closing cover 812 can be opened and closed with an arcuate movement trajectory and the opening space can be minimized as compared with a linear one. The opening / closing cover 812 is provided at the end of the opening / closing cover 712 with respect to the endless rail body 85 provided around the opening 812a along the circumferential surface of the casing 81. It is possible to easily secure a structure that can be opened and closed on either side in the left-right direction, such as suspending so that it can be opened and closed by supporting the traveling body 76 that has been opened. Is obtained to facilitate the cleaning operation, it is possible to arrange also a difficult box structure that space work space, such as a clean box.
In addition, the rail body 85 is formed by two rail members having a substantially circular cross section arranged side by side at a predetermined interval, and the traveling body 86 is slidably suspended between the rail members and supported. Since it was made, the part which a granular material penetrates into a clearance gap, or is laminated | stacked compared with the case where the member attached to the outer peripheral surface of the casing 81, for example, when using an L-shaped and C-shaped rail member, etc. Therefore, the outer surface side of the casing 81 can be easily cleaned.
In addition, although the rail body 85 was provided in the upper part of the opening part 812a, this may be provided in the lower part and you may make it drive | work the opening / closing cover 812. FIG.
[0020]
Further, since the opening / closing cover 812 suspends the traveling body 86 slidably between the rail members and is suspended without providing an anti-rest mechanism or the like at the lower part or the like, the opening / closing cover 812 can swing in this state. If the opening / closing cover 812 is pulled forward and inclined, the lower part can be easily cleaned.
Further, the opening / closing cover 812 is suspended so that the suspension shaft 861 and the suspension bracket 862 can be moved or swung in the front-rear direction by the tightening operation of the operation lever 863. The surface pressure operation for winding 88 is easy to perform, and the door is opened and closed with a certain distance from the outer surface of the casing 81 when the door is opened, so that the vehicle can run smoothly and the back side of the opening / closing cover 812 can be easily cleaned. Can be done.
Moreover, since the opening / closing cover 812 can be attached and detached by engaging and disengaging the cap nut 863b, it can be arbitrarily assembled and disassembled in accordance with a light work such as a cleaning work, and an efficient work can be performed.
[0021]
【The invention's effect】
Bug cross 82 inside Formed by The bag filter 8 includes a casing 81 in which a predetermined filtering means is disposed and an opening / closing cover 812 is provided in the maintenance opening 812a.
In the present invention, the bug filter 8 is The casing 81 is formed in a cylindrical shape. Clean box 2 etc. Formed by In the box structure With storage The opening / closing cover 812 In the box structure To enable opening / closing operation And a sliding door mechanism that opens and closes along the outer peripheral surface of the casing 81. As a result, a box structure such as clean box 2 Inside Although the bag filter 8 is used for the above, the synchronization of the internal environment of the box structure and the processing apparatus and the internal environment of the bag filter 8 is not impaired during maintenance work such as cleaning, and the environments of both are synchronized. You can make any adjustment work unnecessary, The opening / closing cover 812 can be opened / closed along the cylindrical outer peripheral surface of the casing 81, and the rotation space of the opening / closing cover by a conventional hinged door mechanism can be eliminated. In addition to being able to minimize the open door space compared to a straight line, it is easy to clean the interior, and can easily secure a structure that can be opened and closed on either side of the left and right sides. The work can be easily performed and can be stored in a box structure in which it is difficult to secure a work space, such as the clean box 2 provided with the arm gloves 231 and 241 for maintenance. as a result, For example, even if the processing materials are frequently switched, and even when the usability of assembling, disassembling and cleaning the processing chamber 31 is required each time, a quick cleaning operation can be performed together with these operations, the productivity efficiency may be impaired. In addition, the overall labor savings such as workability and cost can be achieved, and it is possible to reliably prevent the cleaning solvent from splashing and reacting with impurities in the outside air, and the solvent recovery and equipment drying can be performed properly. There are no restrictions on the raw materials that can be processed.
[Brief description of the drawings]
FIG. 1 is a front view of a partially broken entire clean box.
[Fig. 2] Rear view of the entire clean box
[Fig. 3] Overall top view of clean box
[Figure 4] Front view of bag filter
[Figure 5] Side view of bag filter
[Figure 6] Top view of the bag filter
[Fig. 7] Horizontal sectional view of the upper compartment of the bag filter
FIG. 8 is a longitudinal sectional view of the opening / closing cover part of the bag filter.
[Explanation of symbols]
1 frame
2 Clean box
21 Frame board
22, 23, 24 Operation unit
221, 231, 241 Arm cloves
3 Crusher
31 treatment room
311 discharge pipe
32 Drive mechanism
4 Supply device
41 Supply section
411 screw shaft
412 Mounting member
413 piping
414 supply pipe
412a, 413a, 414a Clamp
42 Drive unit
51 Air Lock
52 Exhaust filter
6 Operation panel
71 Supply container
72 Discharge chute
73 Collection container
8 Bug filter
81 casing
811 Head cover
811a Clamp handle
812 Open / close cover
812a opening
812b Connecting cylinder
812c Cover handle
813 Buttocks
82 Bug Cross
83 Header pipe
831 piping
832 Solenoid valve
833 Backwash nozzle
834 Exhaust vent
84 partition plate
84a Retainer mounting hole
841 Upper room
842 lower chamber
85 rail body
851 Rail bracket
86 Running body
861 Suspension shaft
862 Suspension bracket
863 Operation lever
863a Nut
863b Cap nut
87 Packing rubber
871 Airtight pocket
88 band body
881 Adjustable fastener
882 connecting shaft

Claims (10)

A bag filter comprising a casing in which predetermined filtering means is disposed, and an opening / closing cover is provided in the maintenance opening, wherein the bag filter is formed by forming the casing into a cylindrical shape. together allowed to store in the structure, the cover, in order to enable the opening and closing operation of the box structure, particulate material processing, characterized in that is constituted by a sliding door mechanism for opening and closing along the outer peripheral surface of the casing Device bug filter. 2. The sliding door mechanism according to claim 1, wherein the sliding door mechanism opens and closes the opening / closing cover by supporting a traveling body provided at an end of the opening / closing cover with respect to a rail body provided along the peripheral surface of the casing. The bag filter of the granular material processing apparatus characterized by being comprised . 3. The rail body according to claim 2, wherein the rail body is formed of two rail members arranged side by side at a predetermined interval, and the traveling body is slidably suspended and supported between the rail members. A bug filter for a granular material processing apparatus. 4. The opening / closing cover according to claim 2, wherein the opening / closing cover is configured to be suspended by providing the rail body at an upper portion of the opening and providing the traveling body at an upper end portion of the opening / closing cover. Bug filter for powder processing equipment. 5. The bag filter for a granular material processing apparatus according to claim 2, wherein the rail body has a substantially circular or semicircular cross section, and the traveling body has a spherical shape. The bug of any one of claims 2 to 5, wherein the rail member is disposed on both sides of the opening so that the opening / closing cover can be opened and closed in the left-right direction. filter. In any one of Claims 1 to 6, the opening is formed in a curved or bent opening surface, and the open / close cover is surface-closed with an air-tight material interposed in the four peripheral areas of the opening. A bag filter for a granular material processing apparatus, characterized in that the open / close cover is configured to be closed by a surface pressure means that is attached to both sides of the casing in the circumferential back direction of the casing. 8. The bag filter of a granular material processing apparatus according to claim 7 , wherein the surface pressure means includes a band body and an adjustment fastener. In any one of claims 1 to 8, wherein the cover is a bag filter of the particulate material processing apparatus characterized by being swingably suspended in the front-rear direction. In any one of claims 1 to 9, wherein the cover is a bag filter of the particulate material processing apparatus characterized by being configured to be detachable.

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