Bag turning type centrifugal machine

Abstract

The invention belongs to the technical field of centrifugal machines, and relates to a bag turning type centrifugal machine which comprises a rotary drum, a material pushing disc, cylindrical filter cloth, a sealing cover, an outer shaft and an inner shaft, the material pushing disc is connected with the inner shaft, the two ends of the cylindrical filter cloth are connected with the front end of the material pushing disc and the front end of the rotary drum respectively, and a feeding pipe is inserted into the center of the sealing cover. The filter cloth cleaning mechanism comprises a steel ring, an annular electromagnet and a coil bracket; the steel ring is in magnetic attraction connection with the annular electromagnet and is propped against the inner side of the cylindrical filter cloth; the locking mechanism comprises an annular sealing sleeve, the annular sealing sleeve is fixedly connected with the rotary drum, the sealing cover is connected with the annular sealing sleeve in a clamped mode, and during discharging, the inner shaft pushes the material pushing disc and the sealing cover to move towards the front end of the rotary drum and drives the rear end of the cylindrical filter cloth to be folded towards the front end. The steel ring is always attracted by the annular electromagnet and located at the bending position of the cylindrical filter cloth to pull the cylindrical filter cloth, the folded cylindrical filter cloth is tensioned, damage caused by irregular folding and extrusion of the cylindrical filter cloth is prevented, and meanwhile solid materials attracted by the inner ring of the cylindrical filter cloth are scraped off.

Description

Technical Field

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

[0002] The bag-turning centrifuge has attracted wide 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 which are arranged on the frame and rotate around a horizontal axis, and a shell assembly which is covered outside the drum assembly. A rotating power device which drives the main shaft and the drum assembly to rotate is arranged on the frame. A push rod which can slide along the main shaft axis direction is passed through the main shaft. A rotating connecting piece is arranged on the rear end of the push rod. The rotating connecting piece is connected with the bag turning power device which drives the push rod to move in the horizontal direction and is arranged on the frame. The drum assembly comprises a drum bottom connected with the main shaft and a drum wall arranged on the drum bottom. One end of the push rod enters the inner cavity of the drum through a through hole arranged on the drum bottom and a pushing plate is arranged at the end. A filter bag is arranged 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 pushing plate. At least three support rods are evenly distributed circumferentially near the edge of the pushing plate. A retaining ring which matches the outer edge of the drum wall is detachably arranged at the other end of these support rods. 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 block after centrifugal drying during actual production work.

[0003] A bag-turning centrifuge with a Chinese patent document publication number of CN106944265A comprises an outer shaft, an inner shaft, an outer shaft, a drum, a drum door and a push plate, the push plate is connected to one end of the inner shaft, a filter cloth is connected between the push plate and the drum, the outer shaft is driven by a motor, the other end of the inner shaft is provided with an axial blind hole to form an oil cylinder, the piston rod in the oil cylinder is fixedly connected to the hydraulic oil rotating output shaft of the rotary joint, the piston divides the inner cavity of the oil cylinder into the inner and outer cavities of the piston, the piston rod and the hydraulic oil rotating output shaft are provided with the first and second oil passages respectively connected to the inner and outer cavities of the piston, the hydraulic oil rotating output shaft extends into a sleeve fixed on the frame, the side wall of the sleeve is provided with an oil unloading hole, oil holes one, two and an oil unloading hole in sequence, the oil hole one is connected to the first oil passage or the second oil passage, the oil hole two is connected to the second oil passage or the first oil passage, and a clutch is provided between the outer shaft and the inner shaft. However, the patent still has some shortcomings: 1. Materials with high viscosity are easy to 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 drum, a push plate, a cylindrical filter cloth, a sealing cover, an outer shaft installed on a frame, and an inner shaft rotatably installed in the outer shaft, the outer shaft is fixedly connected to the rear end of the drum, the push plate is installed in the 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 push plate, the front end of the cylindrical filter cloth is fixedly connected to the front end of the drum, the sealing cover is used to seal the opening at the front end of the 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 at the rear end of the 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 push plate and smaller than the inner diameter of the drum; the locking mechanism comprises an annular sealing sleeve, the annular sealing sleeve is fixedly connected to the front end of the drum and presses the front end of the cylindrical filter cloth against the front end edge of the 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 support includes a guide cylinder, a guide rod and a tensioning spring, the guide cylinder is hollow inside, 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, the front end of the guide rod passes through the drum and is fixedly connected to the annular electromagnet, and 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 formed on the end surface of the annular sealing sleeve in contact with the sealing cover, the air hole is connected to the bottom of the sealing ring groove, and an insert block is fixed to the edge of the sealing cover, and the insert block can be inserted into the air hole.

[0010] Preferably, the sealing ring is a D-type 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: a filter cloth cleaning mechanism is provided, and when dehydration is completed and unloading is carried out, the inner shaft pushes the push plate and the sealing cover to move toward the front end of the drum, and the movement of the push 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 implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural schematic diagram of a preferred embodiment of a bag-turning centrifuge of the present invention; Figure 2 It is a structural schematic diagram of an inner shaft of an inverting bag centrifuge of the present invention; Figure 3 yes Figure 2 Sectional view at AA in the middle; Figure 4 yes Figure 3 The enlarged view of point B in the middle; Figure 5 yes Figure 3 Enlarged view of point C in the middle; Figure 6 It is a structural schematic diagram of an annular sealing sleeve of an inverting bag centrifuge of the present invention; Figure 7 It is a structural schematic diagram of a cylindrical filter cloth of a bag-turning centrifuge of the present invention; Figure 8 It is a structural schematic diagram of a guide rod of a bag-turning centrifuge of the present invention; Fig. 9 The invention discloses a schematic structural diagram of a steel ring of a bag-turning centrifuge.

[0015] 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. Tension spring; 17. Clamping ring groove; 18. Sealing ring groove; 19. Locking tooth; 20. Reset spring; 21. Air hole; 22. Insert block; 23. Clamping ring. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0017] like Figures 1 to 9 As shown, the present invention provides an embodiment of a bag-turning centrifuge, comprising a rotary drum 1, a push plate 2, a cylindrical filter cloth 3, a sealing cover 4, an outer shaft 5 installed on a frame, and an inner shaft 6 rotatably installed in the outer shaft 5, the outer shaft 5 is fixedly connected to the rear end of the rotary drum 1, the push plate 2 is installed in the rotary 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 push plate 2, the front end of the cylindrical filter cloth 3 is fixedly connected to the front end of the rotary drum 1, the sealing cover 4 is used to seal the opening at the front end of the rotary drum 1, and a feed pipe 7 is slidably inserted in the center of the sealing cover 4.

[0018] 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.

[0019] The coil support 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, and 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, and the rear end of the guide rod 15 is connected to the inner bottom of the guide cylinder 14 through the tensioning spring 16.

[0020] 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 push plate 2 and the sealing cover 4 to move toward the front end of the drum 1. During the movement of the push 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 circle of the cylindrical filter cloth 3, and can scrape off the solid material adsorbed by the inner circle of the cylindrical filter cloth 3, thereby reducing the material residue on the cylindrical filter cloth 3.

[0021] 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 the 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, and the annular electromagnet 9 is driven to move backward through the tensioning spring 16 reset. 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.

[0022] The locking mechanism comprises 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 end 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 .

[0023] 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 locking tooth 19 is slidably installed in the receiving port. A reset spring 20 is fixed to the bottom of the locking tooth 19. When the sealing cover 4 rotates, the locking 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 locking tooth 19 can slide out of the receiving port and insert into the clamping ring groove 17, so as to lock 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 locking tooth 19 is pulled into the receiving port by the reset spring, and finally the pushing plate 2 and the sealing cover 4 are pushed out by advancing the inner shaft 6.

[0024] An air hole 21 is also 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 block 22 is fixed to the edge of the sealing cover 4. The insert block 22 can be inserted into the air hole 21. The insert block 22 squeezes the gas in the air hole 21 to increase the gas pressure between the sealing ring and the sealing ring groove 18, thereby evenly applying 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-type sealing ring has a larger contact area with the sealing cover 4 than the O-ring when in contact, and thus has a better axial sealing effect, so that the sealing cover 4 can better seal the drum 1, and the D-type sealing ring can withstand a larger torsional force and can also achieve a better sealing effect when the drum 1 and the sealing cover 4 rotate. 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.

[0025] A clamping ring 23 is fixed to the bottom of the pusher disc 2, and the rear end of the cylindrical filter cloth 3 is pressed against the bottom of the pusher disc 2 by the clamping ring 23. When the pusher disc 2 is fully retracted to the rear end of the drum 1, the steel ring 8 is sleeved on the outer ring of the pusher disc 2 and is located between the pusher disc 2 and the cylindrical filter cloth 3.

[0026] It 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 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.

[0027] 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 actually located in front of the annular scraper 13 when moving 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, so as to avoid the annular scraper 13 damaging the cylindrical filter cloth 3.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0029] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bag-turning centrifuge, comprising a rotary drum (1), a push 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 rotary drum (1), the push plate (2) is mounted in the rotary 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 push plate (2), the front end of the cylindrical filter cloth (3) is fixedly connected to the front end of the rotary drum (1), the sealing cover (4) is used to seal the opening at the front end of the rotary drum (1), and a feed pipe (7) is slidably inserted in the center of the sealing cover (4), characterized in that: The invention also comprises a filter cloth cleaning mechanism and a locking mechanism, wherein the filter cloth cleaning mechanism comprises a steel ring (8), an annular electromagnet (9) and a coil support (10), wherein the coil support (10) is fixed at the rear end of the rotary drum (1), the annular electromagnet (9) is fixed on 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 comprises an annular sealing sleeve (11), wherein the annular sealing sleeve (11) 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: It also includes a side wall cleaning mechanism, the side wall cleaning mechanism including 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 to the connecting bracket (12), the cutting edge of the annular scraper (13) is slidably connected to the inner wall of the rotating drum (1), and 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) comprises 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 rear end outside of the rotating drum (1) via a flange; the guide rod (15) is slidably mounted in the guide cylinder (14); the front end of the guide rod (15) passes through the rotating 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) via a tension spring (16).

4. The bag-turning 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 tension spring (20) is fixed to the bottom of the locking tooth (19), and 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 also provided on the end surface of the annular sealing sleeve (11) in contact with the sealing cover (4), the air hole (21) being in communication with the bottom of the sealing ring groove (18), and an insert block (22) is fixed to the edge of the sealing cover (4), the insert block (22) being capable of being inserted into the air hole (21).

6. The bag-turning centrifuge according to claim 5, characterized in that: The sealing ring is a D-type 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 block (22) is inserted into the air hole (21), a gap is left between the insert block (22) and the sealing ring.

7. The bag-turning centrifuge according to claim 1, characterized in that: A clamping ring (23) is fixed to the bottom of the pusher disc (2), and the rear end of the cylindrical filter cloth (3) is clamped against the bottom of the pusher disc (2) by the clamping ring (23). When the pusher 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 pusher disc (2) and is located between the pusher 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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