Inverting filter centrifuge

Abstract

An inverting filter centrifuge, which relates to the technical field of centrifuges. The inverting filter centrifuge comprises a rotary drum (1), a material-pushing disc (2), a cylindrical filter cloth (3), a sealing cover (4), an outer shaft (5) and an inner shaft (6), wherein the material-pushing disc (2) is connected to the inner shaft (6), two ends of the cylindrical filter cloth (3) are respectively connected to the material-pushing disc (2) and the front end of the rotary drum (1), and a feeding pipe (7) is inserted into the center of the sealing cover (4). A filter cloth cleaning mechanism comprises a steel ring (8), an annular electromagnet (9) and a coil support (10), wherein the steel ring (8) is magnetically attracted and connected to the annular electromagnet (9) and abuts against the inner side of the cylindrical filter cloth (3). A locking mechanism comprises an annular sealing sleeve (11), wherein the annular sealing sleeve (11) is fixedly connected to the rotary drum (1), and the sealing cover (4) is snap-fitted with the annular sealing sleeve (11). During unloading, the inner shaft (6) pushes the material-pushing disc (2) and the sealing cover (4) to move towards the front end of the rotary drum (1) and drives the rear end of the cylindrical filter cloth (3) to be folded towards the front end thereof, and the steel ring (8) is always attracted by the annular electromagnet (9) and is located at the bend of the cylindrical filter cloth (3) to stretch the cylindrical filter cloth (3) and tighten the folded cylindrical filter cloth (3), preventing the cylindrical filter cloth (3) from being damaged due to irregular folding and squeezing. At the same time, solid materials adhering to the inner ring of the cylindrical filter cloth (3) are scraped off.

Description

A bag-turning centrifuge Technical Field

[0001] The present invention relates to the technical field of centrifuges, in particular to a bag-turning centrifuge. Background Art

[0002] The bag-turning centrifuge has attracted widespread attention and application due to its advantages such as closed operation and complete unloading. The bag-turning centrifuge generally comprises a frame, a hollow main shaft and a drum assembly that are arranged on the frame and rotate around a horizontal axis, and a shell assembly that is covered outside the drum assembly. A rotating power device that drives the main shaft and the drum assembly to rotate is provided on the frame, a push rod that can slide along the main shaft axis is passed through the main shaft, and a rotating connecting piece is provided at the tail end of the push rod. The rotating connecting piece is connected to the bag-turning power device that drives the push rod arranged on the frame to move in the horizontal direction. The drum assembly includes a drum bottom connected to the main shaft and a drum wall arranged on the drum bottom. One end of the push rod passes through a through hole provided on the drum bottom and enters the drum cavity and is provided with a push plate at the end; a filter bag is provided on the inner side of the drum wall, one end of the filter bag is arranged on the outer edge of the drum, and the other end of the filter bag is arranged on the push plate. At least three support rods are evenly distributed circumferentially near the edge of the push plate, and a blocking ring that matches the outer edge of the drum wall is detachably provided at the other end of these support rods, and the main shaft drives the push rod to rotate synchronously through a transmission mechanism. The working process includes: feeding, filtering, washing, dehydration, unloading, and filter cloth cleaning. The bag-turning drive mechanism currently used is mostly hydraulically driven, which is prone to leakage and pollution. It is not allowed in occasions with high cleanliness requirements such as pharmaceuticals. However, for fine and viscous materials, the current bag-turning centrifuge structure has the phenomenon that the material will condense into a whole piece after centrifugal drying during actual production.

[0003] Chinese patent publication number CN106944265A discloses a bag-turning centrifuge comprising an outer shaft, an inner shaft, a drum, a drum door, and a pusher plate. The pusher plate is connected to one end of the inner shaft, and a filter cloth is connected between the pusher plate and the drum. The outer shaft is driven by a motor, and the other end of the inner shaft is provided with an axial blind hole to form an oil cylinder. A piston rod in the oil cylinder is fixedly connected to a hydraulic oil rotating output shaft of a rotary joint. The piston divides the oil cylinder cavity into an inner and outer piston chambers. The piston rod and the hydraulic oil rotating output shaft are provided with first and second oil passages, respectively, connecting the inner and outer piston chambers. The hydraulic oil rotating output shaft extends into a sleeve fixed to the frame. The sidewall of the sleeve is sequentially provided with an oil discharge hole, a first oil passage, a second oil passage, and an oil discharge hole. The first oil passage is connected to the first oil passage or the second oil passage, and the second oil passage is connected to the second oil passage or the first oil passage. A clutch is provided between the outer shaft and the inner shaft. However, this patent still has some shortcomings: 1. Highly viscous materials easily adhere to the filter cloth. 2. During dehydration, a small amount of material will pass through the filter cloth and be adsorbed on the inner wall of the drum, causing the water holes on the drum to be blocked. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that material residue is easily generated inside the bag-turning centrifuge after unloading, the present invention provides a bag-turning centrifuge to solve the above problem.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a bag-turning centrifuge, including a rotary drum, a pusher plate, a cylindrical filter cloth, a sealing cover, an outer shaft mounted on a frame, and an inner shaft rotatably mounted in the outer shaft, the outer shaft is fixedly connected to the rear end of the rotary drum, the pusher plate is mounted in the rotary drum and is coaxially fixedly connected to the inner shaft, the rear end of the cylindrical filter cloth is fixedly connected to the outer ring of the pusher plate, the front end of the cylindrical filter cloth is fixedly connected to the front end of the rotary drum, the sealing cover is used to seal the opening at the front end of the rotary drum, the center of the sealing cover is slidably plugged with a feed pipe, and also includes a filter cloth cleaning mechanism and a locking mechanism The filter cloth cleaning mechanism comprises a steel ring, an annular electromagnet and a coil bracket, the coil bracket is fixed to the rear end of the rotary drum, the annular electromagnet is fixed on the coil bracket and abuts against the outer side of the cylindrical filter cloth, the steel ring is magnetically connected to the annular electromagnet and abuts against the inner side of the cylindrical filter cloth, the diameter of the steel ring is larger than the outer diameter of the pushing plate and smaller than the inner diameter of the rotary drum; the locking mechanism comprises an annular sealing sleeve, which is fixedly connected to the front end of the rotary drum and presses the front end of the cylindrical filter cloth against the front end edge of the rotary drum, and the outer ring of the sealing cover is clamped with the inner ring of the annular sealing sleeve.

[0006] Preferably, it also includes a side wall cleaning mechanism, which includes a connecting bracket and an annular scraper. There are multiple connecting brackets, and the multiple connecting brackets are evenly fixed to the outer ring of the annular electromagnet along the circumferential direction of the annular electromagnet. The bottom of the annular scraper is fixed on the connecting bracket, and the cutting edge of the annular scraper is slidably connected to the inner wall of the rotating drum. The outer diameter of the annular scraper is smaller than the inner diameter of the rotating drum and larger than the diameter of the steel ring.

[0007] Preferably, the coil bracket includes a guide cylinder, a guide rod and a tensioning spring. The guide cylinder is hollow inside, and one end of the guide cylinder is fixed to the outer side of the rear end of the drum through a flange. The guide rod is slidably installed in the guide cylinder, and the front end of the guide rod passes through the drum and is fixedly connected to the annular electromagnet. The rear end of the guide rod is connected to the inner bottom of the guide cylinder through a tensioning spring.

[0008] Preferably, the inner ring of the annular sealing sleeve is provided with a clamping ring groove and a sealing ring groove, a sealing ring is installed in the sealing ring groove, a accommodating opening is provided on the side of the sealing cover, a locking tooth is slidably installed in the accommodating opening, a reset spring is fixed to the bottom of the locking tooth, and when the sealing cover rotates, the front end of the locking tooth can slide out of the accommodating opening and be inserted into the clamping ring groove.

[0009] Preferably, an air hole is provided on the end surface of the annular sealing sleeve that contacts the sealing cover, and the air hole is connected to the bottom of the sealing ring groove. An insert is fixed to the edge of the sealing cover, and the insert can be inserted into the air hole.

[0010] Preferably, the sealing ring is a D-shaped sealing ring, the maximum diameter of the cross section of the sealing ring is smaller than the depth of the sealing ring groove, and when the plug is inserted into the air hole, a gap is left between the plug and the sealing ring.

[0011] Preferably, a clamping ring is fixed to the bottom of the pushing plate, and the rear end of the cylindrical filter cloth is pressed against the bottom of the pushing plate by the clamping ring. When the pushing plate is fully retracted to the rear end of the drum, the steel ring is sleeved on the outer ring of the pushing plate and is located between the pushing plate and the cylindrical filter cloth. The steel ring and the annular electromagnet are clamped on the inner and outer sides of the cylindrical filter cloth under the action of magnetic force.

[0012] The beneficial effects of the present invention are that: a filter cloth cleaning mechanism is provided, and when dehydration is completed and unloading is carried out, the inner shaft pushes the pushing plate and the sealing cover to move toward the front end of the drum, and the movement of the pushing plate drives the rear end of the cylindrical filter cloth to fold and move toward the front end. During this process, the steel ring is always attracted by the annular electromagnet and is located at the bending part of the cylindrical filter cloth, that is, the longitudinal cross-section of the cylindrical filter cloth is a "U"-shaped structure, and the steel ring is located at the bottom of the "U"-shaped structure to pull the cylindrical filter cloth, and the rear end of the cylindrical filter cloth moves forward while driving the steel ring and the annular electromagnet to move forward synchronously. The steel ring can tighten the folded cylindrical filter cloth to prevent damage caused by irregular folding and squeezing of the cylindrical filter cloth. At the same time, the steel ring slides along the inner ring of the cylindrical filter cloth, and can scrape off the solid material adsorbed by the inner ring of the cylindrical filter cloth, thereby reducing the material residue on the cylindrical filter cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] FIG1 is a schematic structural diagram of a preferred embodiment of an inverting bag centrifuge according to the present invention;

[0015] FIG2 is a schematic structural diagram of an inner shaft of an inverting bag centrifuge according to the present invention;

[0016] FIG3 is a cross-sectional view of the AA portion of FIG2 ;

[0017] FIG4 is an enlarged view of point B in FIG3 ;

[0018] FIG5 is an enlarged view of point C in FIG3 ;

[0019] FIG6 is a schematic structural diagram of an annular sealing sleeve of an inverting bag centrifuge according to the present invention;

[0020] 7 is a schematic structural diagram of a cylindrical filter cloth of an inverting bag centrifuge according to the present invention;

[0021] FIG8 is a schematic structural diagram of a guide rod of a bag-turning centrifuge according to the present invention;

[0022] FIG9 is a schematic structural diagram of a steel ring of an inverting bag centrifuge according to the present invention.

[0023] Figure numerals: 1, drum; 2, push plate; 3, cylindrical filter cloth; 4, sealing cover; 5, outer shaft; 6, inner shaft; 7, feed pipe; 8, steel ring; 9, annular electromagnet; 10, coil bracket; 11, annular sealing sleeve; 12, connecting bracket; 13, annular scraper; 14, guide cylinder; 15, guide rod; 16, tensioning spring; 17, clamping ring groove; 18, sealing ring groove; 19, locking tooth; 20, reset spring; 21, air hole; 22, plug block; 23, clamping ring. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] As shown in Figures 1 to 9, the present invention provides an embodiment of an inverting bag centrifuge, including a drum 1, a pusher plate 2, a cylindrical filter cloth 3, a sealing cover 4, an outer shaft 5 mounted on a frame, and an inner shaft 6 rotatably mounted within the outer shaft 5, the outer shaft 5 being fixedly connected to the rear end of the drum 1, the pusher plate 2 being mounted within the drum 1 and coaxially fixedly connected to the inner shaft 6, the rear end of the cylindrical filter cloth 3 being fixedly connected to the outer ring of the pusher plate 2, the front end of the cylindrical filter cloth 3 being fixedly connected to the front end of the drum 1, the sealing cover 4 being used to seal the opening at the front end of the drum 1, and a feed pipe 7 being slidably inserted into the center of the sealing cover 4.

[0026] It also includes a filter cloth cleaning mechanism and a locking mechanism. The filter cloth cleaning mechanism includes a steel ring 8, an annular electromagnet 9 and a coil bracket 10. The coil bracket 10 is fixed to the rear end of the drum 1. The annular electromagnet 9 is fixed on the coil bracket 10 and abuts against the outer side of the cylindrical filter cloth 3. The steel ring 8 is magnetically connected to the annular electromagnet 9 and abuts against the inner side of the cylindrical filter cloth 3. The diameter of the steel ring 8 is larger than the outer diameter of the push plate 2 and smaller than the inner diameter of the drum 1. The steel ring 8 and the annular electromagnet 9 are clamped on the inner and outer sides of the cylindrical filter cloth 3 under the action of magnetic force.

[0027] The coil bracket 10 includes a guide cylinder 14, a guide rod 15 and a tensioning spring 16. The guide cylinder 14 is hollow inside. One end of the guide cylinder 14 is fixed to the outer side of the rear end of the drum 1 through a flange. The guide rod 15 is slidably installed in the guide cylinder 14. The front end of the guide rod 15 passes through the drum 1 and is fixedly connected to the annular electromagnet 9. The rear end of the guide rod 15 is connected to the inner bottom of the guide cylinder 14 through the tensioning spring 16.

[0028] The working principle of the filter cloth cleaning mechanism is: when dehydration is completed and unloading is carried out, the inner shaft 6 pushes the pushing plate 2 and the sealing cover 4 to move toward the front end of the drum 1. During the movement of the pushing plate 2, the rear end of the cylindrical filter cloth 3 is driven to fold and move toward the front end. During this process, the steel ring 8 is always attracted by the annular electromagnet 9 and is located at the bending part of the cylindrical filter cloth 3, that is, the longitudinal cross-section of the cylindrical filter cloth 3 is a "U"-shaped structure, and the steel ring 8 is located at the bottom of the "U"-shaped structure to pull the cylindrical filter cloth 3. While the rear end of the cylindrical filter cloth 3 moves forward, it drives the steel ring 8 and the annular electromagnet 9 to move forward synchronously. The steel ring 8 can tighten the folded cylindrical filter cloth 3 to prevent the cylindrical filter cloth 3 from being damaged by irregular folding and squeezing. At the same time, the steel ring 8 slides along the inner ring of the cylindrical filter cloth 3, and can scrape off the solid material adsorbed by the inner ring of the cylindrical filter cloth 3, thereby reducing the material residue on the cylindrical filter cloth 3.

[0029] When the annular electromagnet 9 moves forward, it can pull the guide rod 15 out of the guide cylinder 14. At this time, the tensioning spring 16 is stretched. When unloading is completed, the inner shaft 6 drives the pushing plate 2 and the sealing cover 4 to move toward the rear end of the drum 1. The tensioning spring 16 is reset to drive the annular electromagnet 9 to move backward. The annular electromagnet 9 attracts the steel ring 8 to move backward, and the steel ring 8 pulls the cylindrical filter cloth 3 to move into the drum 1. Therefore, no matter whether the cylindrical filter cloth 3 moves out of the drum 1 or into the drum 1, its bottom can always be pulled by the steel ring 8, so that the surface of the folded cylindrical filter cloth 3 can remain flat when moving, reducing the situation where the material remains in the folds and is difficult to unload. At the same time, it can also avoid the cylindrical filter cloth 3 being damaged by excessive pressure at the folds.

[0030] The locking mechanism includes an annular sealing sleeve 11 , which is fixedly connected to the front end of the drum 1 and presses the front end of the cylindrical filter cloth 3 against the front edge of the drum 1 . The outer ring of the sealing cover 4 is clamped with the inner ring of the annular sealing sleeve 11 .

[0031] The inner ring of the annular sealing sleeve 11 is provided with a clamping ring groove 17 and a sealing ring groove 18, and a sealing ring is installed in the sealing ring groove 18. A receiving port is provided on the side of the sealing cover 4, and a lock tooth 19 is slidably installed in the receiving port. A reset spring 20 is fixed to the bottom of the lock tooth 19. When the sealing cover 4 rotates, the lock tooth 19 moves toward the outer ring of the sealing cover 4 under the action of centrifugal force and stretches the reset spring 20, so that the front end of the lock tooth 19 can slide out of the receiving port and insert into the clamping ring groove 17, thereby locking the sealing cover 4 and the annular sealing sleeve 11. When the dehydration is completed and the sealing cover 4 needs to be opened, the drum 1 first stops rotating, and the lock tooth 19 is pulled into the receiving port by the reset spring, and finally the pushing tray 2 and the sealing cover 4 are pushed out by advancing the inner shaft 6.

[0032] An air hole 21 is further provided on the end surface of the annular sealing sleeve 11 in contact with the sealing cover 4. The air hole 21 is communicated with the bottom of the sealing ring groove 18. An insert 22 is fixed to the edge of the sealing cover 4. The insert 22 can be inserted into the air hole 21. The insert 22 squeezes the gas in the air hole 21, thereby increasing the gas pressure between the sealing ring and the sealing ring groove 18, and then uniformly applies pressure to all parts of the sealing ring, so that the sealing ring can fit more closely on the sealing cover 4. The sealing ring adopts a D-type sealing ring, which has a rectangular base cross-section. The D-shaped sealing ring has a larger contact area with the sealing cover 4 than the O-shaped ring, thereby having a better axial sealing effect, so that the sealing cover 4 can better seal the drum 1, and the D-shaped sealing ring can withstand a larger torsional force. When the drum 1 and the sealing cover 4 rotate, it can also achieve a better sealing effect. The maximum diameter of the cross section of the sealing ring is smaller than the depth of the sealing ring groove 18. When the plug 22 is inserted into the air hole 21, a gap is left between the plug 22 and the sealing ring to prevent the plug 22 from pressing the sealing ring and causing damage to the sealing ring.

[0033] A clamping ring 23 is fixed to the bottom of the pushing plate 2, and the rear end of the cylindrical filter cloth 3 is pressed against the bottom of the pushing plate 2 by the clamping ring 23. When the pushing plate 2 is fully retracted to the rear end of the drum 1, the steel ring 8 is sleeved on the outer ring of the pushing plate 2 and is located between the pushing plate 2 and the cylindrical filter cloth 3.

[0034] It also includes a side wall cleaning mechanism, which includes a connecting bracket 12 and an annular scraper 13. There are multiple connecting brackets 12, and the multiple connecting brackets 12 are evenly fixed on the outer ring of the annular electromagnet 9 along the circumferential direction of the annular electromagnet 9. The bottom of the annular scraper 13 is fixed on the connecting bracket 12. The cutting edge of the annular scraper 13 is slidably connected to the inner wall of the drum 1. The outer diameter of the annular scraper 13 is smaller than the inner diameter of the drum 1 and larger than the diameter of the steel ring 8.

[0035] The working principle of the side wall cleaning mechanism is: when the annular electromagnet 9 moves toward the outside of the drum 1, it will drive the annular scraper 13 to move along the inner wall of the drum 1 to clean the drum 1. At the same time, since the annular electromagnet 9 and the annular scraper 13 are both located at the outer bottom of the cylindrical filter cloth 3, the cylindrical filter cloth 3 can be located in front of the annular scraper 13 during movement and does not contact the annular scraper 13. That is, the annular scraper 13 will clean the corresponding part of the inner wall of the drum 1 only after the cylindrical filter cloth 3 is separated from the drum 1, thereby preventing the annular scraper 13 from damaging the cylindrical filter cloth 3.

[0036] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0037] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A bag-turning centrifuge, comprising a drum (1), a pusher plate (2), a cylindrical filter cloth (3), a sealing cover (4), an outer shaft (5) mounted on a frame, and an inner shaft (6) rotatably mounted in the outer shaft (5), wherein the outer shaft (5) is fixedly connected to the rear end of the drum (1), the pusher plate (2) is mounted in the drum (1) and is coaxially fixedly connected to the inner shaft (6), the rear end of the cylindrical filter cloth (3) is fixedly connected to the outer ring of the pusher plate (2), the front end of the cylindrical filter cloth (3) is fixedly connected to the front end of the drum (1), the sealing cover (4) is used to seal the opening at the front end of the drum (1), and a feed pipe (7) is slidably inserted into the center of the sealing cover (4), characterized in that: The invention also includes a filter cloth cleaning mechanism and a locking mechanism, wherein the filter cloth cleaning mechanism includes a steel ring (8), an annular electromagnet (9) and a coil support (10), wherein the coil support (10) is fixed to the rear end of the rotary drum (1), the annular electromagnet (9) is fixed to the coil support (10) and abuts against the outer side of the cylindrical filter cloth (3), the steel ring (8) is magnetically connected to the annular electromagnet (9) and abuts against the inner side of the cylindrical filter cloth (3), and the diameter of the steel ring (8) is larger than the outer diameter of the push plate (2) and smaller than the inner diameter of the rotary drum (1); the locking mechanism includes an annular sealing sleeve (11), which is fixedly connected to the front end of the rotary drum (1) and presses the front end of the cylindrical filter cloth (3) against the front end edge of the rotary drum (1), and the outer ring of the sealing cover (4) is clamped with the inner ring of the annular sealing sleeve (11).

2. The bag-turning centrifuge according to claim 1, characterized in that: The invention also includes a side wall cleaning mechanism, which includes a connecting bracket (12) and an annular scraper (13). A plurality of connecting brackets (12) are provided, and the plurality of connecting brackets (12) are evenly fixed to the outer ring of the annular electromagnet (9) along the circumferential direction of the annular electromagnet (9). The bottom of the annular scraper (13) is fixed on the connecting bracket (12). The cutting edge of the annular scraper (13) is slidably connected to the inner wall of the rotating drum (1). The outer diameter of the annular scraper (13) is smaller than the inner diameter of the rotating drum (1) and larger than the diameter of the steel ring (8).

3. The bag-turning centrifuge according to claim 1, characterized in that: The coil support (10) includes a guide cylinder (14), a guide rod (15) and a tension spring (16). The guide cylinder (14) is hollow inside. One end of the guide cylinder (14) is fixed to the outside of the rear end of the drum (1) through a flange. The guide rod (15) is slidably installed in the guide cylinder (14). The front end of the guide rod (15) passes through the drum (1) and is fixedly connected to the annular electromagnet (9). The rear end of the guide rod (15) is connected to the inner bottom of the guide cylinder (14) through the tension spring (16).

4. The inverting bag centrifuge according to claim 1, characterized in that: The inner ring of the annular sealing sleeve (11) is provided with a clamping ring groove (17) and a sealing ring groove (18), a sealing ring is installed in the sealing ring groove (18), and the side of the sealing cover (4) is provided with a receiving opening, a locking tooth (19) is slidably installed in the receiving opening, and a reset spring (20) is fixed to the bottom of the locking tooth (19). When the sealing cover (4) rotates, the front end of the locking tooth (19) can slide out of the receiving opening and be inserted into the clamping ring groove (17).

5. The bag-turning centrifuge according to claim 1, characterized in that: An air hole (21) is further provided on the end surface of the annular sealing sleeve (11) that contacts the sealing cover (4). The air hole (21) is communicated with the bottom of the sealing ring groove (18). An insert (22) is fixed to the edge of the sealing cover (4). The insert (22) can be inserted into the air hole (21).

6. The inverting bag centrifuge according to claim 5, characterized in that: The sealing ring is a D-shaped sealing ring, the maximum diameter of the cross section of the sealing ring is smaller than the depth of the sealing ring groove (18), and when the insert (22) is inserted into the air hole (21), a gap is left between the insert (22) and the sealing ring.

7. The inverting bag centrifuge according to claim 1, characterized in that: A clamping ring (23) is fixed to the bottom of the pushing disc (2), and the rear end of the cylindrical filter cloth (3) is pressed against the bottom of the pushing disc (2) by the clamping ring (23). When the pushing disc (2) is completely retracted to the rear end of the drum (1), the steel ring (8) is sleeved on the outer ring of the pushing disc (2) and is located between the pushing disc (2) and the cylindrical filter cloth (3). The steel ring (8) and the annular electromagnet (9) are clamped on the inner and outer sides of the cylindrical filter cloth (3) under the action of magnetic force.

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