Economical multi-channel integrated labyrinth compressor

Abstract

The present invention relates to the field of compressors, and in particular to an economical multi-channel integrated labyrinth compressor, comprising a base and three labyrinth compressors installed on the upper end of the base, a square elbow installed at the front edge of the upper end of the base, a dirt cleaning piece provided at the bend of the square elbow, one end of the square elbow fixedly connected to three No. 1 connecting pipes in a linear array, the ends of the three No. 1 connecting pipes are respectively connected to the cooling channel inlets on the three labyrinth compressors, a control valve is installed on each of the three No. 1 connecting pipes, the other end of the square elbow fixedly connected to an inlet pipe, and the cooling channel outlets on the three labyrinth compressors are fixedly connected to a No. 2 connecting pipe. The present invention saves costs and ensures that the cooling force can meet the actual working requirements of each labyrinth compressor, while also ensuring the cooling effect and the working efficiency of the labyrinth compressor.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to an economical multi-channel integrated labyrinth compressor. Background Art

[0002] A labyrinth compressor consists of a cylinder with labyrinth grooves and a piston, forming a sealed compression chamber. The reciprocating motion of the piston changes the volume of compressed gas per unit, thereby increasing the compressed gas pressure. The labyrinth seal achieves sealing by preventing leakage of the medium within the labyrinth grooves. The labyrinth seal of a labyrinth compressor consists of two parts: one seal between the labyrinth piston and the cylinder, and the other seal between the labyrinth packing and the piston rod. Both parts operate on the same sealing principle.

[0003] To meet user needs, three labyrinth compressors are often combined into one unit. However, existing labyrinth compressors are usually equipped with a cooling system for each unit to cool the compressor. This method increases costs due to the multiple cooling systems. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose an economical multi-channel integrated labyrinth compressor.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is: an economical multi-channel integrated labyrinth compressor, including a base and three labyrinth compressors installed on the upper end of the base, a square bend pipe is installed at the front edge of the upper end of the base, and a cleaning part is provided at the bend of the square bend pipe. One end of the square bend pipe is fixedly connected to three No. 1 connecting pipes in a linear array, and the ends of the three No. 1 connecting pipes are respectively connected to the cooling channel inlets on the three labyrinth compressors. A control valve is installed on the three No. 1 connecting pipes, and the other end of the square bend pipe is fixedly connected to the inlet pipe. The cooling channel outlets on the three labyrinth compressors are fixedly connected to the No. 2 connecting pipe, and the ends of the three No. 2 connecting pipes are fixedly connected to the outlet pipe.

[0006] Preferably, a No. 1 pipe rack is fixedly installed on the rear end of the square elbow, and the end of the No. 1 pipe rack is fixed to the machine base. A No. 2 pipe rack is fixedly installed on the outer surface of the outlet pipe, and the end of the No. 2 pipe rack is fixed to the machine base.

[0007] Preferably, the dirt cleaning part includes a plurality of barrier plates evenly distributed and obliquely extending at the bend of the inner surface of the square bend tube, and a plurality of download shells are evenly distributed and inlaid through the bend of the lower end surface of the square bend tube, and the plurality of download shells correspond to the plurality of barrier plates, and the upper end of the download shell is open, and a piston scraper is slidably installed inside the download shell, and the upper end surface of the piston scraper is inclined toward the angle between the barrier plate and the square bend tube.

[0008] Preferably, a lifting threaded rod is rotatably installed at the bending part of the outer surface of the square elbow, and a lifting threaded sleeve is screwed on the outer surface of the lifting threaded rod. A top column is fixedly installed at the lower end of the piston scraper, and the top column passes through the lower end of the download shell. The top column is slidably matched with the download shell, and the top column is connected to the lifting threaded sleeve.

[0009] Preferably, a plurality of upper carrier shells are evenly distributed and embedded through the bending part of the upper end surface of the square elbow, and the plurality of upper carrier shells correspond to the plurality of barrier sheets. The lower end of the upper carrier shell is open, and two connecting frames are symmetrically extended from the outer surface of the lifting threaded sleeve. The ends of the two connecting frames are fixedly installed with lifting frames, and the lower end of the top column is fixed to the lifting frame.

[0010] Preferably, top ears extend from opposite sides of the two connecting frames near the upper edges, and limiting columns are elastically installed inside the multiple upper carrier shells. The limiting columns pass through the upper end of the multiple limiting columns, and column seats are embedded between the upper ends of the multiple limiting columns. Two top frames are symmetrically fixedly installed on the column seats, and the top frames correspond to the top ears.

[0011] Preferably, a piston sealing cap is fixedly installed on the lower end of the limiting column, and the piston sealing cap is tightly attached to the inner wall of the upper carrier shell. A compression spring is wound around the outer side of the limiting column, and the two ends of the compression spring are respectively fixed to the upper end of the piston sealing cap and the inner top surface of the upper carrier shell. A sewage outlet is provided through the side of the upper carrier shell, and a sealing cover is tightly covered on the sewage outlet. A rubber pad is provided between the sealing cover and the sewage outlet.

[0012] Preferably, a positioning shell is inlaid in the middle of the upper end surface of the square elbow, a positioning block is slidably installed inside the positioning shell, a cover frame is inlaid at the rear end of the positioning block, the end of the cover frame is fixed to the sealing cover, the upper and lower end surfaces of the positioning block are provided with slide grooves, the end of the positioning shell is slidably installed inside the slide groove, the front end of the positioning shell is fixedly installed with a threaded seat, an extrusion threaded rod is screwed through the interior of the threaded seat, an extrusion ear is rotatably installed at the end of the extrusion threaded rod, the extrusion ear is pressed against the positioning block, the lower end of the threaded seat is fixedly installed with a guide seat, and the lower end of the extrusion ear is symmetrically fixed with two guide claws, and the two guide claws slide through the front and rear end surfaces of the guide seat respectively.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The cooling oil flows into the three No. 1 connecting pipes through the inlet pipe and the square elbow respectively, and enters the cooling channels of the three labyrinth compressors under the guidance of the three No. 1 connecting pipes respectively, so as to cool down the three labyrinth compressors at the same time. The cooling process can be completed by a single cooling system, without the need to equip multiple cooling systems, which effectively saves costs. At the same time, the control valve on each No. 1 connecting pipe can be rotated to adjust the flow rate of the cooling oil in the corresponding labyrinth compressor to ensure that the cooling intensity can meet the actual working requirements of each labyrinth compressor.

[0015] 2. When the cooling oil flows through the square elbow, centrifugal force is generated when its flow direction changes, causing the sludge in the cooling oil to move outward under the action of the centrifugal force and be blocked and collected by the barrier, thereby avoiding the phenomenon of excessive sludge affecting cooling and effectively ensuring the cooling effect.

[0016] When the piston scraper moves up and approaches the upper shell, the top ear just contacts with the top frame, and then the piston scraper continues to move up, at this time, the top ear synchronously supports the top frame, so that the piston sealing cap can slide up in the upper shell to open the upper shell, allowing the piston scraper to push the collected sludge into the upper shell. At this time, the two ends of the piston scraper are respectively pressed against the interior of the lower shell and the interior of the upper shell to seal them, so that the cooling oil circulating in the square elbow will not enter the upper shell and the lower shell, and then the drain port is opened to clean the collected sludge from the drain port. The process does not require shutdown operation, thereby effectively ensuring the working efficiency of the labyrinth compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the economical multi-channel integrated labyrinth compressor of the present invention;

[0018] Figure 2 This is a schematic diagram of the combined layout of the economical multi-channel integrated labyrinth compressor of the present invention;

[0019] Figure 3 This is a schematic diagram of the square bend of the economical multi-channel integrated labyrinth compressor of the present invention;

[0020] Figure 4 This is a schematic diagram of the No. 1 connecting pipe of the economical multi-channel integrated labyrinth compressor of the present invention;

[0021] Figure 5 This is an internal view of the lower shell of the economical multi-channel integrated labyrinth compressor of the present invention;

[0022] Figure 6 This is an internal view of the upper carrier shell of the economical multi-channel integrated labyrinth compressor of the present invention;

[0023] Figure 7 This is an internal view of the square elbow of the economical multi-channel integrated labyrinth compressor of the present invention;

[0024] Figure 8 This is a schematic diagram of the upper shell of the economical multi-channel integrated labyrinth compressor of the present invention.

[0025] In the figure: 1. base; 2. labyrinth compressor; 3. No. 1 connecting pipe; 4. Inlet pipe; 5. Square elbow; 6. No. 1 pipe rack; 7. No. 2 pipe rack; 8. Outlet pipe; 9. No. 2 connecting pipe; 10. Lifting threaded rod; 11. Threaded seat; 12. Lifting threaded sleeve; 13. Connecting frame; 14. Lifting frame; 15. Top column; 16. Top ear; 17. Download shell; 18. Top frame; 19. Column seat; 20. Upper shell; 21. Block; 22. Control valve; 23. Piston scraper; 24. Limiting column; 25. Compression spring; 26. Piston sealing cap; 27. Drain port; 28. Rubber pad; 29. Sealing cover; 30. Positioning shell; 31. Positioning block; 32. Slide groove; 33. Extrusion ear; 34. Guide seat; 35. Guide claw; 36. Extrusion threaded rod; 37. Cover frame. DETAILED DESCRIPTION

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0027] like Figures 1-8The economical multi-channel integrated labyrinth compressor shown includes a base 1 and three labyrinth compressors 2 installed on the upper end of the base 1. The base 1 is provided with a shell to cover the three labyrinth compressors 2. Since this covering method is an existing technology, it is not described in detail here. The labyrinth compressor 2 is formed by a cylinder and a piston with a labyrinth groove to form a sealed compression chamber. The volume of the unit compressed gas is changed by the reciprocating motion of the piston, thereby increasing the pressure of the compressed gas. Since the labyrinth compressor 2 is an existing technology and has been widely used, it is not described in detail here. A square bend 5 is installed at the front edge of the upper end of the base 1. A cleaning part is provided at the bend of the square bend 5. One end of the square bend 5 is fixedly connected to three No. 1 connecting pipes 3 in a linear array. The square bend 5 can change the flow direction of the cooling oil, thereby generating centrifugal force, so that the sludge in the cooling oil moves outward under the action of the centrifugal force and is blocked and collected by the blocking plate 21. The three No. 1 connecting pipes The ends of the through pipes 3 are respectively connected to the cooling channel inlets on the three labyrinth compressors 2. The three No. 1 connecting pipes 3 are each installed with a control valve 22. The control valve 22 can adjust the flow rate of the cooling oil in the corresponding labyrinth compressor 2 to ensure that the cooling force can meet the actual working requirements of each labyrinth compressor 2. The other end of the square bend pipe 5 is fixedly connected to the inlet pipe 4. The cooling channel outlets on the three labyrinth compressors 2 are all fixedly connected to the No. 2 connecting pipe 9. The No. 1 connecting pipe 3 and the No. 2 connecting pipe 9 both serve to connect with the labyrinth compressor 2. The ends of the three No. 2 connecting pipes 9 are fixedly connected to the outlet pipe 8. The outlet pipe 8 is connected to the inlet of the external cooler, and the inlet pipe 4 is connected to the external oil pump and the outlet of the cooler in turn, so that the cooling oil is pressurized through the oil pump to make it flow, and the cooling oil is cooled through the cooler. Because this operation method is a prior art and has been widely used, it is not explained in detail here and is not shown in the figure.

[0028] A No. 1 pipe rack 6 is fixedly installed on the rear end of the square bend pipe 5, and the end of the No. 1 pipe rack 6 is fixed to the machine base 1. The No. 1 pipe rack 6 plays a role in supporting and fixing the square bend pipe 5. A No. 2 pipe rack 7 is fixedly installed on the outer surface of the outlet pipe 8. The end of the No. 2 pipe rack 7 is fixed to the machine base 1. The No. 2 pipe rack 7 plays a role in supporting and fixing the outlet pipe 8.

[0029] The dirt cleaning part includes a plurality of baffles 21 that are evenly distributed and obliquely extended at the bend of the inner surface of the square elbow 5. The baffles 21 play a role in blocking and collecting the sludge. The bend of the lower end surface of the square elbow 5 is evenly distributed and inlaid with a plurality of download shells 17. The plurality of download shells 17 correspond to the plurality of baffles 21. The upper end of the download shell 17 is open, and the download shell 17 plays a role in carrying the piston scraper 23. On the one hand, the piston scraper 23 can push the collected sludge, and on the other hand, it can seal the download shell 17 to prevent the cooling oil from entering the download shell 17. The piston scraper 23 is slidably installed inside the download shell 17. The upper end face of the piston scraper 23 is inclined toward the angle between the baffle 21 and the square elbow 5, and can load the sludge when pushing the sludge.

[0030] A lifting threaded rod 10 is rotatably installed at the bending part of the outer surface of the square elbow 5, and a lifting threaded sleeve 12 is tightened on the outer surface of the lifting threaded rod 10. The cooperation between the lifting threaded rod 10 and the lifting threaded sleeve 12 can drive the piston scraper 23 to move upward to push the sludge. A top column 15 is fixedly installed at the lower end of the piston scraper 23. The top column 15 passes through the lower end of the download shell 17. The top column 15 slides with the download shell 17. The top column 15 plays a role in supporting the piston scraper 23, and the top column 15 is connected to the lifting threaded sleeve 12.

[0031] The upper end surface of the square elbow 5 is evenly distributed with multiple upper carrier shells 20 inlaid therethrough at the bending part. The multiple upper carrier shells 20 correspond to the multiple barrier sheets 21. The upper carrier shell 20 plays the role of loading the sludge pushed by the piston scraper 23. The lower end of the upper carrier shell 20 is open, and two connecting frames 13 extend symmetrically from the outer surface of the lifting threaded sleeve 12. The ends of the two connecting frames 13 are fixedly installed with a lifting frame 14. The lower end of the top column 15 is fixed to the lifting frame 14. The connecting frame 13 and the lifting frame 14 play the role of fixing the top column 15 and the lifting threaded sleeve 12 together.

[0032] Top ears 16 are extended from the opposite sides of the two connecting frames 13 near the upper edges, and limiting columns 24 are elastically installed inside the multiple upper carrier shells 20. The limiting columns 24 pass through the upper end of the upper carrier shell 20. The limiting columns 24 serve to limit the compression springs 25. A column seat 19 is inlaid between the upper ends of the multiple limiting columns 24. The column seat 19 drives the multiple limiting columns 24 to move synchronously. Two top frames 18 are symmetrically fixedly installed on the column seat 19. The top frame 18 corresponds to the top ear 16. The top ear 16 can push the top frame 18 to move the piston sealing cap 26 upward to open the upper carrier shell 20, so that the sludge can smoothly enter the upper carrier shell 20.

[0033] The piston cap 26 is fixedly mounted on the lower end of the limiting column 24, and the piston cap 26 is tightly attached to the inner wall of the upper carrier shell 20. The piston cap 26 can seal the upper carrier shell 20, so that the cooling oil will not enter the upper carrier shell 20, thereby preventing the cooling oil from seeping out from the drain port 27, thereby enhancing the sealing. A compression spring 25 is wound around the outer side of the limiting column 24, and the two ends of the compression spring 25 are respectively fixed to the upper end of the piston cap 26 and the inner top surface of the upper carrier shell 20. The compression spring 25 plays the role of resetting the piston cap 26 after it moves up. A drain port 27 is provided through the side of the upper carrier shell 20, and the drain port 27 plays the role of discharging the collected sludge. The drain port 27 is tightly covered with a sealing cover 29, which plays the role of sealing the drain port 27. A rubber pad 28 is provided between the sealing cover 29 and the drain port 27, and the rubber pad 28 plays the role of improving the sealing.

[0034] The middle part of the upper end surface of the square elbow 5 is inlaid with a positioning shell 30, and a positioning block 31 is slidably installed inside the positioning shell 30. The positioning shell 30 and the positioning block 31 play the role of allowing the sealing cover 29 to dock smoothly with the sewage outlet 27. The rear end of the positioning block 31 is inlaid with a cover frame 37. The end of the cover frame 37 is fixed to the sealing cover 29. The cover frame 37 plays the role of carrying multiple sealing covers 29. The upper and lower end surfaces of the positioning block 31 are provided with a slide groove 32. The slide groove 32 plays the role of preventing the positioning block 31 from moving back and forth. The end of the positioning shell 30 is slidably installed inside the slide groove 32. The front end of the positioning shell 30 is fixedly installed with a threaded seat 11. The interior of the threaded seat 11 passes through The extrusion threaded rod 36 is screwed in, and the end of the extrusion threaded rod 36 is rotatably installed with an extrusion ear 33. The threaded seat 11 and the extrusion threaded rod 36 can drive the extrusion ear 33 to move to squeeze the positioning block 31, and then squeeze the sealing cover 29, so that the sealing cover 29 can be firmly pressed on the sewage outlet 27, and the extrusion ear 33 is pressed on the positioning block 31. The lower end of the threaded seat 11 is fixedly installed with a guide seat 34, and the lower end of the extrusion ear 33 is symmetrically fixed with two guide claws 35. The guide seat 34 and the guide claws 35 can guide the extrusion ear 33 to prevent the extrusion ear 33 from rotating. The two guide claws 35 slide through the front and rear end surfaces of the guide seat 34 respectively.

[0035] During use, the cooling oil flows into the three No. 1 connecting pipes 3 through the inlet pipe 4 and the square bend pipe 5 respectively, and enters the cooling channels of the three labyrinth compressors 2 under the guidance of the three No. 1 connecting pipes 3, and is then discharged through the No. 2 connecting pipe 9 and the outlet pipe 8, thereby circulating to cool the three labyrinth compressors 2. During this process, the control valve 22 on each No. 1 connecting pipe 3 can also be rotated to adjust the flow rate of the cooling oil in the corresponding labyrinth compressor 2 to ensure that the cooling force can meet the actual working requirements of each labyrinth compressor 2. In the above cooling process, when the cooling oil flows through the square bend pipe 5, centrifugal force will be generated when its flow direction changes, so that the sludge in the cooling oil moves outward under the action of the centrifugal force, and is blocked and collected by the blocking plate 21. At this time, by rotating the lifting threaded rod 10, the lifting threaded sleeve 12 can be driven to move upward, and then the top column 15 can be driven upward to push the piston scraper 23 so that the piston scraper 23 can extend from the lower shell 17. , to push the sludge collected at the angle between the blocking piece 21 and the square elbow 5. When the piston scraper 23 moves up and approaches the upper carrier shell 20, the top ear 16 just contacts the top frame 18, and then the piston scraper 23 continues to move up. At this time, the top ear 16 synchronously supports the top frame 18, so that the piston sealing cap 26 can slide up in the upper carrier shell 20 to open the upper carrier shell 20, so that the piston scraper 23 can push the collected sludge into the upper carrier shell 20. At this time, the two ends of the piston scraper 23 are respectively close to the download The interior of the shell 17 and the interior of the upper shell 20 are sealed so that the cooling oil circulating in the square elbow 5 will not enter the upper shell 20 and the lower shell 17. Then, the extrusion threaded rod 36 is rotated to drive the positioning block 31 to move, so that the positioning block 31 loses the extrusion of the extrusion ear 33, and then the positioning block 31 is pushed out from the positioning shell 30. The sealing cover 29 can be removed, and the drain port 27 is opened so that the collected sludge can be cleaned out from the drain port 27 to ensure the normal operation of the system.

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An economical multi-channel integrated labyrinth compressor, comprising a base (1) and three labyrinth compressors (2) mounted on the upper end of the base (1), characterized in that: A square bend (5) is installed at the front edge of the upper end of the base (1), and a cleaning piece is provided at the bend of the square bend (5). One end of the square bend (5) is fixedly connected to three No. 1 connecting pipes (3) in a linear array, and the ends of the three No. 1 connecting pipes (3) are respectively connected to the cooling channel inlets on the three labyrinth compressors (2). A control valve (22) is installed on each of the three No. 1 connecting pipes (3). The other end of the square bend (5) is fixedly connected to an inlet pipe (4), and the cooling channel outlets on the three labyrinth compressors (2) are fixedly connected to a No. 2 connecting pipe (9), and the ends of the three No. 2 connecting pipes (9) are fixedly connected to an outlet pipe (8). The dirt cleaning member comprises a plurality of baffles (21) uniformly distributed and obliquely extending at the bend of the inner surface of the square bend tube (5); a plurality of download shells (17) are uniformly distributed and embedded through the bend of the lower end surface of the square bend tube (5); the plurality of download shells (17) correspond to the plurality of baffles (21); the upper end of the download shell (17) is open; a piston scraper (23) is slidably installed inside the download shell (17); the upper end surface of the piston scraper (23) is inclined toward the angle between the baffle (21) and the square bend tube (5); A lifting threaded rod (10) is rotatably mounted on the outer surface of the square elbow (5), a lifting threaded sleeve (12) is screwed onto the outer surface of the lifting threaded rod (10), a top column (15) is fixedly mounted on the lower end of the piston scraper (23), the top column (15) passes through the lower end of the download shell (17), the top column (15) and the download shell (17) are slidably matched, and the top column (15) is connected to the lifting threaded sleeve (12); A plurality of upper carrier shells (20) are evenly distributed and embedded in the upper end of the square elbow (5), and the plurality of upper carrier shells (20) correspond to the plurality of blocking sheets (21). The lower end of the upper carrier shell (20) is open, and two connecting frames (13) are symmetrically extended from the outer surface of the lifting thread sleeve (12). The ends of the two connecting frames (13) are fixedly mounted with lifting frames (14), and the lower end of the top column (15) is fixed to the lifting frame (14); Top ears (16) are extended from opposite sides of the two connecting frames (13) near the upper edges, and a plurality of limiting columns (24) are elastically installed inside the upper carrier shells (20), and the limiting columns (24) pass through the upper end of the upper carrier shells (20). A column seat (19) is embedded between the upper ends of the plurality of limiting columns (24), and two top frames (18) are symmetrically fixedly installed on the column seat (19), and the top frames (18) correspond to the top ears (16); A piston sealing cap (26) is fixedly mounted on the lower end of the limiting column (24), and the piston sealing cap (26) is tightly attached to the inner wall of the upper carrier shell (20). A compression spring (25) is wound around the outer side of the limiting column (24), and the two ends of the compression spring (25) are respectively fixed to the upper end of the piston sealing cap (26) and the inner top surface of the upper carrier shell (20). A sewage outlet (27) is provided through the side of the upper carrier shell (20), and a sealing cover (29) is tightly covered on the sewage outlet (27). A rubber pad (28) is provided between the sealing cover (29) and the sewage outlet (27).

2. The economical multi-channel integrated labyrinth compressor according to claim 1, characterized in that: A No. 1 pipe rack (6) is fixedly mounted on the rear end of the square bend pipe (5), and an end of the No. 1 pipe rack (6) is fixed to the machine base (1). A No. 2 pipe rack (7) is fixedly mounted on the outer surface of the outlet pipe (8), and an end of the No. 2 pipe rack (7) is fixed to the machine base (1).

3. The economical multi-channel integrated labyrinth compressor according to claim 1, characterized in that: A positioning shell (30) is embedded in the middle of the upper end surface of the square elbow (5), a positioning block (31) is slidably installed inside the positioning shell (30), a cover frame (37) is embedded at the rear end of the positioning block (31), the end of the cover frame (37) is fixed to the sealing cover (29), and a sliding groove (32) is provided on the upper and lower end surfaces of the positioning block (31), the end of the positioning shell (30) is slidably installed inside the sliding groove (32), and a fixed front end of the positioning shell (30) is fixedly installed. A threaded seat (11) is provided, wherein an extrusion threaded rod (36) is screwed through the interior of the threaded seat (11), an extrusion ear (33) is rotatably mounted on the end of the extrusion threaded rod (36), and the extrusion ear (33) is pressed against the positioning block (31). A guide seat (34) is fixedly mounted on the lower end of the threaded seat (11), and two guide claws (35) are symmetrically fixedly mounted on the lower end of the extrusion ear (33), and the two guide claws (35) are respectively slidably mounted on the front and rear end surfaces of the guide seat (34).

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