High-rotating-speed closed explosion-proof centrifugal machine

Abstract

The invention relates to the technical field of centrifugal machines, and discloses a high-rotating-speed closed anti-explosion centrifugal machine which comprises a centrifugal machine body, a rotating drum arranged on the centrifugal machine body, discharging pipes arranged at the two ends of the rotating drum and a discharging opening formed in the rotating drum, an annular plate is arranged at one end of the interior of the rotating drum, and a sliding block is fixedly installed at the position, away from the discharging opening, of the outer side of the annular plate; sliding grooves matched with the sliding blocks are formed in the inner wall of the rotary drum, grooves corresponding to the discharging ports are formed in the outer side of the annular plate at equal intervals in a surrounding mode, and cleaning blocks are arranged in the grooves. According to the centrifugal machine, the discharging port can be conveniently cleaned, the situation that follow-up discharging is affected due to the fact that the discharging port is blocked can be avoided, normal use of the centrifugal machine is guaranteed, self-cleaning of a scraper for cleaning the discharging port can be achieved, and the situation that in the discharging port cleaning process, part of materials enter a mounting groove to affect combination of an iron frame and an electromagnet can be prevented; therefore, the normal resetting of the scraper is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifuges, and in particular relates to a high-speed closed explosion-proof centrifuge. Background Art

[0002] The closed explosion-proof centrifuge is a new type of horizontal screw centrifuge. It uses the solid-liquid specific gravity difference and relies on the centrifugal force field to expand it thousands of times. The solid phase is settled under the action of centrifugal force, thereby achieving solid-liquid separation and being discharged from the body separately under the action of special mechanisms. The entire feeding and separation process is completed continuously, closed and automatically. Since the centrifuge adopts a closed nitrogen filling system, the air in the machine can be effectively discharged to prevent the material from being flammable and explosive.

[0003] When the existing high-speed closed explosion-proof centrifuge is in use, the material is discharged through the discharge port, but the material will accumulate on the inner wall of the discharge port. With long-term use, the material will block the discharge port, affecting the use of the entire centrifuge.

[0004] Therefore, it is necessary to invent a high-speed closed explosion-proof centrifuge to solve the above problems. Summary of the invention

[0005] In view of the above problems, the present invention provides a high-speed closed explosion-proof centrifuge to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-speed closed explosion-proof centrifuge, comprising a centrifuge, a drum arranged on the centrifuge, discharge pipes arranged at both ends of the drum, and a discharge port arranged on the drum, a ring plate is arranged at one end inside the drum, a slider is fixedly installed on the outer side of the ring plate away from the discharge port, a slide groove cooperating with the slider is arranged on the inner wall of the drum, grooves corresponding to the discharge port are equidistantly opened on the outer side of the ring plate, a cleaning block is arranged in the groove, a scraper is symmetrically arranged on one side of the cleaning block away from the center of the ring plate, a driving component for driving the two scrapers to separate quickly is arranged on the cleaning block, an ejection component for driving the cleaning block to move out of the groove is arranged on the drum, and a pushing component for pushing the ring plate to move horizontally is arranged on the drum.

[0007] Furthermore, the driving assembly includes an iron frame fixedly connected to the bottom of the scraper, the cleaning block is provided with a mounting groove corresponding to the iron frame, the iron frame is slidably arranged in the mounting groove, a baffle is symmetrically fixedly installed on the inner wall of the mounting groove, a socket corresponding to the iron frame is provided on the baffle, a first spring is sleeved on the outside of the iron frame, the first spring is located between the baffle and the iron frame, and an electromagnet is fixedly installed on the inner wall of the mounting groove and between a pair of baffles.

[0008] Furthermore, the ejection assembly includes a push rod, a vertical opening connected to the groove is opened on the side of the ring plate away from the discharge port, one end of the push rod passes through the vertical opening and is fixedly connected to the cleaning block, and the side of the push rod away from the center of the ring plate is fixedly connected to the inner wall of the vertical opening through a second spring, and a toggle rod is rotatably installed on the middle part of one end of the rotating drum close to the ring plate, one end of the toggle rod extends to the interior of the rotating drum, and the end of the toggle rod extending into the rotating drum matches the inner diameter of the ring plate, an arc-shaped ejection block corresponding to the push rod is provided on the outside of the toggle rod, and a reset assembly for driving the toggle rod to reset is provided on the outside of the toggle rod.

[0009] Furthermore, the reset assembly includes a torsion spring sleeved outside the toggle rod, the two ends of the torsion spring are respectively fixedly connected to the rotating drum and the toggle rod, the outside of the toggle rod is fixedly connected with a stopper, and the outer side of the rotating drum is fixedly installed with a stopper that cooperates with the stopper.

[0010] Furthermore, the pushing assembly includes a push rod fixedly connected to a side of the ring plate away from the discharge port, and one end of the push rod extends to the outer thread of the drum and is connected to a knob.

[0011] Furthermore, two adjacent scrapers are provided with arc grooves on one side away from the ring plate, and the two opposite arc grooves are fixedly connected by elastic cloth. A lifting component for lifting the elastic cloth is provided in the installation groove.

[0012] Furthermore, the lifting assembly includes a bracket fixedly connected to the two baffles, a rectangular rod is slidably inserted inside the bracket, the rectangular rod is made of iron, a conical top block is fixedly installed on the end of the rectangular rod away from the electromagnet, and an inclined groove cooperating with the conical top block is provided on the side of the two scrapers close to the conical top block, and a third spring is sleeved on the outside of the rectangular rod and located between the bracket and the conical top block, and the two ends of the third spring are respectively fixedly connected to the bracket and the conical top block.

[0013] Furthermore, when the conical top block moves to lift up the elastic fabric, the conical top block will not fall out of the inclined groove.

[0014] Technical effects and advantages of the present invention:

[0015] 1. The present invention can facilitate the cleaning of the discharge port, thereby preventing the discharge port from being blocked and affecting subsequent discharge, thereby ensuring the normal use of the centrifuge;

[0016] 2. The present invention can realize self-cleaning of the scraper for cleaning the discharge port, and can prevent part of the material from entering the installation groove during the cleaning process of the discharge port to affect the combination of the iron frame and the electromagnet, thereby affecting the resetting of the scraper, thereby ensuring that the scraper can be reset normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic structural diagram of a high-speed sealed explosion-proof centrifuge according to an embodiment of the present invention is shown;

[0018] Figure 2 A partial cross-sectional structural schematic diagram of a high-speed closed explosion-proof centrifuge according to an embodiment of the present invention is shown;

[0019] Figure 3 The embodiment of the present invention is shown Figure 2 The enlarged structural diagram at A in the middle;

[0020] Figure 4 The embodiment of the present invention is shown Figure 3 The enlarged structural diagram at B in the middle;

[0021] Figure 5 The embodiment of the present invention is shown Figure 1 The enlarged structural diagram at C in the middle;

[0022] Figure 6 A structural schematic diagram showing a partial structure of an embodiment of the present invention;

[0023] In the figure: 1, centrifuge; 2, drum; 3, discharge pipe; 4, discharge port; 5, ring plate; 6, slider; 7, cleaning block; 8, scraper; 9, iron frame; 10, baffle; 11, first spring; 12, electromagnet; 13, ejector rod; 14, second spring; 15, toggle rod; 16, arc top block; 17, stop block; 18, stop block; 19, push rod; 20, knob; 21, elastic cloth; 22, bracket; 23, rectangular rod; 24, conical top block; 25, third spring; 26, torsion spring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0025] The present invention provides a high-speed closed explosion-proof centrifuge, such as Figures 1 to 6 As shown, it includes a centrifuge 1, a drum 2 arranged on the centrifuge 1, discharge pipes 3 arranged at both ends of the drum 2, and a discharge port 4 arranged on the drum 2. The centrifuge 1 is a high-speed closed explosion-proof centrifuge in the prior art. A ring plate 5 is arranged at one end of the inner part of the drum 2. A slider 6 is fixedly installed on the outer side of the ring plate 5 away from the discharge port 4. A slide groove cooperating with the slider 6 is arranged on the inner wall of the drum 2. Grooves corresponding to the discharge port 4 are equidistantly opened on the outer side of the ring plate 5. A cleaning block 7 is arranged in the groove. A scraper 8 is symmetrically arranged on one side of the cleaning block 7 away from the center of the ring plate 5. A driving component for driving the two scrapers 8 to separate quickly is arranged on the cleaning block 7. A ejection component for driving the cleaning block 7 to move out of the groove is arranged on the drum 2. A pushing component for pushing the ring plate 5 to move horizontally is arranged on the drum 2.

[0026] When in use, the centrifuge 1 cooperates with the drum 2 to separate the solid and liquid of the material. The dehydrated material is discharged from the discharge port 4 into the discharge pipe 3 and falls to the outside for collection. When the discharge port 4 needs to be cleaned, the ring plate 5 is driven by the pushing component to move in the direction close to the discharge port 4. When a pair of scrapers 8 are aligned with the discharge port 4, the pushing is stopped at this time, and the cleaning block 7 is pushed outward by the ejecting component, thereby moving with the scraper 8. The two scrapers 8 are matched with the discharge port 4. As the scraper 8 rises, the material attached to the inner wall of the discharge port 4 is scraped off, and finally the pair of scrapers 8 leave the groove. Located outside the discharge port 4, at this time, a pair of scrapers 8 are driven by the driving component to quickly separate and generate vibration, so that the material on the surface of the scraper 8 is shaken off, thereby realizing self-cleaning of the scraper 8, and then the scraper 8 is driven to reset by the driving component, and the ejection of the cleaning block 7 by the ejection component is cancelled. The cleaning block 7 is reset and brings the scraper 8 back to the groove, and then the ring plate 5 is driven to reset by the pushing component. At this time, the cleaning of the discharge port 4 and the self-cleaning of the scraper 8 are completed, and the cleaned and fallen materials fall to the outside through the discharge pipe 3. By cleaning the discharge port 4, the blockage of the discharge port 4 and the impact on subsequent discharge can be avoided.

[0027] like Figure 4 As shown, the driving assembly includes an iron frame 9 fixedly connected to the bottom of the scraper 8, a mounting groove corresponding to the iron frame 9 is opened on the cleaning block 7, the iron frame 9 is slidably set in the mounting groove, a baffle 10 is symmetrically fixedly installed on the inner wall of the mounting groove, a socket corresponding to the iron frame 9 is opened on the baffle 10, a first spring 11 is sleeved on the outside of the iron frame 9, the first spring 11 is located between the baffle 10 and the iron frame 9, an electromagnet 12 is fixedly installed on the inner wall of the mounting groove and between a pair of baffles 10, and a power supply for the electromagnet 12 is provided on the drum 2, which is not shown in the figure.

[0028] When the scraper 8 is outside the discharge port 4, the electromagnet 12 is powered off to make it lose its magnetism and cancel the fixation of the iron frame 9. At this time, the compressed first spring 11 releases its force to make the iron frame 9 and the scraper 8 move quickly, so that the pair of scrapers 8 are quickly separated. When the iron frame 9 collides with the inner wall of the installation groove, vibration is generated, and the material attached to the scraper 8 is shaken off to the outside, so that the scraper 8 is cleaned, and the electromagnet 12 is powered on to make it magnetic, thereby attracting the iron frame 9 to reset the scraper 8, and at the same time compressing the first spring 11 to deform it to generate a force, and finally the iron frame 9 and the electromagnet 12 are fixed.

[0029] like Figure 3 , Figure 5 and Figure 6As shown, the ejection assembly includes a push rod 13, a vertical opening connected to the groove is opened on the side of the ring plate 5 away from the discharge port 4, one end of the push rod 13 passes through the vertical opening and is fixedly connected to the cleaning block 7, and the side of the push rod 13 away from the center of the ring plate 5 is fixedly connected to the inner wall of the vertical opening through a second spring 14, and a toggle rod 15 is rotatably installed in the middle of one end of the drum 2 close to the ring plate 5, one end of the toggle rod 15 extends to the interior of the drum 2, and the end of the toggle rod 15 extending into the drum 2 matches the inner diameter of the ring plate 5, an arc-shaped top block 16 corresponding to the push rod 13 is provided on the outside of the toggle rod 15, and a reset assembly for driving it to reset is provided on the outside of the toggle rod 15.

[0030] When the scraper 8 is aligned with the discharge port 4, the toggle rod 15 is rotated forward to move it with the arc-surface top block 16. The arc-surface top block 16 cooperates with its arc surface to raise the top rod 13 and the cleaning block 7. At the same time, the second spring 14 is compressed to deform it to generate a force, so that the cleaning block 7 moves with the scraper 8 to the outside of the discharge port 4. The toggle rod 15 is driven by the reset component to reset it, thereby resetting the arc-surface top block 16, so that the arc-surface top block 16 leaves the top rod 13, and the second spring 14 releases its force to reset the top rod 13, the cleaning block 7, and the scraper 8.

[0031] like Figure 5 As shown, the reset assembly includes a torsion spring 26 sleeved on the outside of the toggle rod 15, the two ends of the torsion spring 26 are respectively fixedly connected to the drum 2 and the toggle rod 15, the outside of the toggle rod 15 is fixedly connected with a stopper 17, and the outer side of the drum 2 is fixedly installed with a stopper 18 that cooperates with the stopper 17.

[0032] The forward rotation of the toggle rod 15 causes the block 17 to move with it, and the block 17 leaves the abutment 18 to cancel the abutment state. At the same time, the torsion spring 26 torsional deforms to generate a force, and the toggle rod 15 is released. The toggle spring 26 releases the force and moves the toggle rod 15 in the reverse direction to reset, so that the block 17 abuts against the abutment 18.

[0033] like Figure 2 , Figure 3 and Figure 5 As shown, the pushing assembly includes a push rod 19 fixedly connected to the side of the ring plate 5 away from the discharge port 4, and one end of the push rod 19 extends to the outer thread of the drum 2 and is connected to a knob 20.

[0034] The forward rotation knob 20 separates it from the push rod 19, pushing the push rod 19 makes it move with the ring plate 5 toward the discharge port 4, pulling the push rod 19 makes it return with the ring plate 5, and the reverse rotation knob 20 makes it contact with the drum 2, thereby fixing the position of the ring plate 5.

[0035] like Figure 4 and Figure 6As shown, two adjacent scrapers 8 are provided with arc grooves on one side away from the ring plate 5, and the two opposite arc grooves are fixedly connected by an elastic cloth 21, and a lifting component for lifting the elastic cloth 21 is provided in the installation groove.

[0036] When a pair of scrapers 8 move away from each other, the elastic cloth 21 is stretched open, and the elastic cloth 21 can prevent part of the material from falling into the installation groove and affecting the combination of the iron frame 9 and the electromagnet 12. As the pair of scrapers 8 separate from each other, the lifting component continuously lifts the middle of the elastic cloth 21, causing the elastic cloth 21 to arch, so that the material dropped on the elastic cloth 21 slides to both sides, and the vibration of the scraper 8 is cooperated to achieve the separation of the material.

[0037] like Figure 4 As shown, the lifting assembly includes a bracket 22 fixedly connected to the two baffles 10, a rectangular rod 23 is slidably inserted inside the bracket 22, the rectangular rod 23 is made of iron, and a conical top block 24 is fixedly installed on the end of the rectangular rod 23 away from the electromagnet 12. An inclined groove cooperating with the conical top block 24 is provided on the side of the two scrapers 8 close to the conical top block 24, and a third spring 25 is sleeved on the outside of the rectangular rod 23 and located between the bracket 22 and the conical top block 24. The two ends of the third spring 25 are respectively fixedly connected to the bracket 22 and the conical top block 24.

[0038] As the pair of scrapers 8 separate and the electromagnet 12 loses its magnetism due to power failure, the rectangular rod 23 is no longer adsorbed and fixed. The compressed third spring 25 releases its force to lift the conical top block 24, thereby lifting the middle position of the elastic cloth 21. The electromagnet 12 is started to be energized and has magnetism, thereby attracting the rectangular rod 23 and the conical top block 24 to descend and reset. At the same time, the third spring 25 is compressed to deform it and generate a force, and finally the rectangular rod 23 is fixed to the electromagnet 12.

[0039] like Figure 4 As shown, when the conical top block 24 moves to lift up the elastic fabric 21, the conical top block 24 will not fall out of the inclined groove.

[0040] This ensures that when a pair of scrapers 8 are reset, the tapered top block 24 can be squeezed in cooperation with the inclined groove to ensure smooth reset of the scrapers 8 .

[0041] Working principle: When in use, the centrifuge 1 cooperates with the drum 2 to separate the solid and liquid of the material. The dehydrated material is discharged from the discharge port 4 into the discharge pipe 3 and falls to the outside for collection. When the discharge port 4 needs to be cleaned, the knob 20 is turned forward to separate it from the push rod 19, and the push rod 19 is pushed to move it with the ring plate 5 toward the discharge port 4. When a pair of scrapers 8 are aligned with the discharge port 4, the push is stopped. At this time, the toggle rod 15 is turned forward to move it with the arc top block 16. The arc top block 16 cooperates with its arc surface to face the push rod 13 and the cleaning block 7 to rise. The second spring 14 is compressed to deform and generate a force, so that the cleaning block 7 moves with the scraper 8 to the outside of the discharge port 4, and the toggle rod 15 moves with the stopper 17, and the stopper 17 leaves the stopper 18 and cancels the state of conflict with it. At the same time, the torsion spring 26 twists and deforms to generate a force. As the scraper 8 rises, the material attached to the inner wall of the discharge port 4 is scraped off. Finally, a pair of scrapers 8 leave the groove and are located outside the discharge port 4. When the scraper 8 is located outside the discharge port 4, the electromagnet 12 is powered off to make it lose its magnetism and cancel the fixation of the iron frame 9. At this time, the compressed first spring 11 is released The force drives the iron frame 9 and the scraper 8 to move quickly, so that the pair of scrapers 8 are separated quickly. When the iron frame 9 collides with the inner wall of the installation groove, vibration is generated, and the materials attached to the scraper 8 are shaken off to the outside, so that the scraper 8 is cleaned. The electromagnet 12 is energized to make it magnetic, thereby attracting the iron frame 9 to reset the scraper 8, and at the same time compressing the first spring 11 to deform it to generate a force. Finally, the iron frame 9 is fixed to the electromagnet 12, and the toggle rod 15 is released. The toggle spring 26 releases the force to reverse and reset the toggle rod 15, so that the stopper 17 conflicts with the stopper 18. The cambered top block 16 is reset, so that the cambered top block 16 leaves the top rod 13, and the second spring 14 releases the force to reset the top rod 13, the cleaning block 7, and the scraper 8. The cleaning block 7 is reset and returns the scraper 8 to the groove, and the push rod 19 is pulled to reset the ring plate 5. The reverse knob 20 is turned to make it contact with the drum 2, so as to fix the position of the ring plate 5. At this time, the cleaning of the discharge port 4 and the self-cleaning of the scraper 8 are completed, and the cleaned and dropped materials fall to the outside through the discharge pipe 3. By cleaning the discharge port 4, the blockage of the discharge port 4 and the subsequent discharge can be avoided.

[0042] When a pair of scrapers 8 move away from each other, the elastic cloth 21 is stretched open. The elastic cloth 21 can prevent part of the material from falling into the installation groove and affecting the combination of the iron frame 9 and the electromagnet 12. As the pair of scrapers 8 separate from each other and the electromagnet 12 loses its magnetism due to power failure, the rectangular rod 23 is lost. The compressed third spring 25 releases its force to lift the conical top block 24, so that the middle position of the elastic cloth 21 is lifted, and the elastic cloth 21 is arched, so that the material dropped on the elastic cloth 21 slides to both sides, and the vibration of the scraper 8 is cooperated to achieve the separation of the material, and the electromagnet 12 is started to be energized and magnetic, so that the rectangular rod 23 is attracted to move the conical top block 24 down and reset, and the third spring 25 is compressed to deform it to generate a force, and finally the rectangular rod 23 is fixed to the electromagnet 12.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A high-speed closed explosion-proof centrifuge, comprising a centrifuge (1), a drum (2) arranged on the centrifuge (1), discharge pipes (3) arranged at both ends of the drum (2), and a discharge port (4) arranged on the drum (2), characterized in that: A ring plate (5) is provided at one end of the inner part of the rotary drum (2), a slider (6) is fixedly mounted on the outer side of the ring plate (5) away from the discharge port (4), a slide groove cooperating with the slider (6) is provided on the inner wall of the rotary drum (2), a groove corresponding to the discharge port (4) is equidistantly formed around the outer side of the ring plate (5), a cleaning block (7) is provided in the groove, a scraper (8) is symmetrically provided on one side of the cleaning block (7) away from the center of the ring plate (5), a driving component for driving the two scrapers (8) to separate quickly is provided on the cleaning block (7), an ejection component for driving the cleaning block (7) to move out of the groove is provided on the rotary drum (2), and a pushing component for pushing the ring plate (5) to move horizontally is provided on the rotary drum (2).

2. The high-speed sealed explosion-proof centrifuge according to claim 1, characterized in that: The driving assembly comprises an iron frame (9) fixedly connected to the bottom of the scraper (8); a mounting groove corresponding to the iron frame (9) is provided on the cleaning block (7); the iron frame (9) is slidably arranged in the mounting groove; a baffle (10) is symmetrically fixedly installed on the inner wall of the mounting groove; a plug hole corresponding to the iron frame (9) is provided on the baffle (10); a first spring (11) is sleeved on the outside of the iron frame (9); the first spring (11) is located between the baffle (10) and the iron frame (9); an electromagnet (12) is fixedly installed on the inner wall of the mounting groove and between a pair of baffles (10).

3. The high-speed sealed explosion-proof centrifuge according to claim 2, characterized in that: The ejection assembly comprises an ejector rod (13); a vertical opening communicating with the groove is formed on a side of the ring plate (5) away from the discharge port (4); one end of the ejector rod (13) passes through the vertical opening and is fixedly connected to the cleaning block (7); a side of the ejector rod (13) away from the center of the ring plate (5) is fixedly connected to the inner wall of the vertical opening via a second spring (14); a toggle rod (15) is rotatably mounted at the middle of one end of the rotating drum (2) close to the ring plate (5); one end of the toggle rod (15) extends into the interior of the rotating drum (2); the end of the toggle rod (15) extending into the interior of the rotating drum (2) matches the inner diameter of the ring plate (5); an arc-surface ejector block (16) corresponding to the ejector rod (13) is provided on the outer side of the toggle rod (15); and a reset assembly for driving the toggle rod (15) to reset is provided on the outer side of the toggle rod (15).

4. The high-speed sealed explosion-proof centrifuge according to claim 3, characterized in that: The reset assembly comprises a torsion spring (26) sleeved outside the toggle rod (15), the two ends of the torsion spring (26) being fixedly connected to the rotating drum (2) and the toggle rod (15) respectively, the outside of the toggle rod (15) being fixedly connected to a stopper (17), and the outside of the rotating drum (2) being fixedly mounted with a stopper (18) cooperating with the stopper (17).

5. The high-speed sealed explosion-proof centrifuge according to claim 4, characterized in that: The pushing assembly comprises a push rod (19) fixedly connected to a side of the ring plate (5) away from the discharge port (4), and one end of the push rod (19) extends to the outer thread of the drum (2) and is connected to a knob (20).

6. The high-speed sealed explosion-proof centrifuge according to claim 5, characterized in that: An arc groove is formed on one side of two adjacent scrapers (8) away from the ring plate (5); the two opposite arc grooves are fixedly connected by an elastic cloth (21); and a lifting component for lifting the elastic cloth (21) is provided in the installation groove.

7. The high-speed sealed explosion-proof centrifuge according to claim 6, characterized in that: The lifting assembly comprises a bracket (22) fixedly connected to the two baffles (10), a rectangular rod (23) is slidably inserted inside the bracket (22), the rectangular rod (23) is made of iron, a conical top block (24) is fixedly installed on one end of the rectangular rod (23) away from the electromagnet (12), an inclined groove matching the conical top block (24) is provided on the side of the two scrapers (8) close to the conical top block (24), a third spring (25) is sleeved outside the rectangular rod (23) and located between the bracket (22) and the conical top block (24), and the two ends of the third spring (25) are respectively fixedly connected to the bracket (22) and the conical top block (24).

8. The high-speed sealed explosion-proof centrifuge according to claim 7, characterized in that: When the conical top block (24) moves to lift the elastic cloth (21), the conical top block (24) will not fall out of the inclined surface groove.

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