Automatic plastic bag forming device for intelligent food packaging

Abstract

The invention relates to the technical field of plastic bag processing, and discloses an automatic plastic bag forming device for intelligent food packaging, which comprises two mounting seats, and a conveying pedestal is arranged between the two mounting seats; the edge cutting mechanism comprises a fixed rod fixedly mounted between the two mounting seats and two detection seats slidably mounted on the fixed rod, stable clamping seats are arranged on the opposite sides of the two detection seats, and mounting side plates are arranged on the opposite sides of the two stable clamping seats; by arranging the edge cutting mechanism, the side edge cutting requirements of the plastic bags for intelligent food packaging can be efficiently met, the distance between the two edge cutting knives can be flexibly adjusted, the edge cutting device is suitable for edge cutting operation of the plastic bags with different widths, and the edge cutting efficiency is improved. Waste generated by edge cutting can be collected by the collecting part through the suction pipe on the inner side of the mounting base, the influence of waste accumulation on machining is reduced, and the regularity of plastic bag side edge cutting is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of plastic bag processing technology, specifically to an automated plastic bag forming device for intelligent food packaging. Background Technology

[0002] Against the backdrop of the continuous development of the smart food packaging industry, plastic bags have become a common carrier in the food packaging field due to their advantages such as being lightweight, airtight, and cost-controllable. The quality of their molding and processing is directly related to food storage safety and packaging aesthetics.

[0003] However, existing plastic bag forming devices mostly have fixed edge-cutting mechanisms with poor flexibility in adjusting the distance between the two edge-cutting blades. This makes them unsuitable for processing plastic bags of different widths and lacks versatility. Furthermore, the edge-cutting blades suffer from poor installation stability, easily shifting during the cutting process. This results in irregular side cuts on the plastic bags, affecting the sealing of subsequent packaging. The waste generated during edge cutting cannot be collected promptly, and its accumulation not only interferes with the processing flow but may also affect product quality. Moreover, in the cutting and forming stage, existing cutting mechanisms often fail to ensure the plastic bags are flat before cutting, easily leading to cutting deviations due to wrinkles and shifts. This results in an uneven cut surface, failing to meet the stringent requirements of intelligent food packaging for dimensional accuracy and appearance regularity. Additionally, the height adjustment mechanism for the cutting blade lacks stability, easily shifting during adjustment and lacking an effective buffer structure. This results in significant cutting impact, easily damaging the cutting blade, shortening its lifespan, and further reducing cutting accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide an automated plastic bag forming device for intelligent food packaging, which solves the problems in the prior art where the spacing adjustment of the cutting blades is inflexible, lacks versatility, and the waste generated during cutting cannot be collected in time. At the same time, it is difficult to ensure the flatness of the plastic bag before cutting, and the cutting deviation is easily caused by the wrinkles and offset of the plastic bag, resulting in an uneven cutting end face.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] An automated plastic bag forming device for smart food packaging includes:

[0007] Two mounting seats are provided, a conveyor platform is provided between the two mounting seats, a movable cylinder is provided between the two mounting seats, and two hot pressure rollers are provided on the movable cylinder;

[0008] An edge-cutting mechanism is located between two mounting seats and is used to cut the side edges of a plastic bag. The edge-cutting mechanism includes a fixed rod fixedly installed between the two mounting seats and two detection seats slidably installed on the fixed rod. A stabilizing bracket is provided on the opposite side of each of the two detection seats, and a mounting side plate is provided on the opposite side of each of the two stabilizing brackets. An edge-cutting knife is provided at the bottom of each of the two mounting side plates, and a stabilizing component is provided on one side of each mounting side plate for stabilizing the mounting side plate and the stabilizing bracket.

[0009] Preferably, the stabilizing component includes multiple fixing slots formed on the outer wall of the stabilizing bracket and multiple fixing rods fixedly installed on one end of the mounting side plate. Each of the multiple fixing slots corresponds to one of the multiple fixing rods, and each of the multiple fixing rods is located inside the multiple fixing slots. The bottom of the mounting side plate is provided with an adjustment component for adjusting the trimming blade.

[0010] Preferably, the adjustment assembly includes a mounting plate fixedly installed at the bottom of the mounting side plate and a hydraulic rod installed between the mounting plate and the cutting blade. The bottom of the hydraulic rod is provided with a limiting rotating seat, the bottom of which is fixed to the top of the cutting blade. A cutting mechanism for cutting plastic bags is provided between the two mounting seats.

[0011] Preferably, a stabilizing seat is provided on the top of the two mounting seats, a lead screw is rotatably installed between the two stabilizing seats, the movable cylinder is screwed to the outer wall of the lead screw, and a power assembly is provided on one side of one of the stabilizing seats.

[0012] Preferably, a suction tube is provided on the inner side of each of the two mounting bases, and a collection part is provided on the outer side of each of the two mounting bases. One end of each of the two suction tubes passes through the mounting base and is connected to the collection part.

[0013] Preferably, the power assembly includes a drive motor mounted on one end of one of the stabilizers and two fixing bolts screwed onto both stabilizers.

[0014] Preferably, the two stabilizers are fixed to the two mounting bases by the two fixing bolts, and the main shaft of the drive motor passes through one of the stabilizers and is connected to the lead screw.

[0015] Preferably, the cutting mechanism includes a fixed base fixedly installed between the two mounting seats and a cutting blade installed at the bottom of the fixed base. A lower pressure plate is slidably installed inside the fixed base, and two connecting rods are slidably installed inside the lower pressure plate. Both connecting rods pass through the fixed base and the lower pressure plate. A connecting plate is fixedly installed at the bottom of the lower pressure plate. A slot is opened at the bottom of the fixed base, and the bottom of the connecting plate passes through the slot and is fixed to the top of the cutting blade. Movable components are provided on the inner walls of both mounting seats.

[0016] Preferably, the movable component is used to adjust the height of the cutting blade. The movable component includes mounting slots formed inside the two mounting seats and an electric push rod installed inside the mounting slots. The top of the fixed seat is provided with a mounting slot, and the two ends of the mounting slot are respectively located inside the two mounting slots. The bottom of the electric push rod is connected to the top of the mounting slot. A limit baffle is fixedly installed on one side of the mounting slot.

[0017] Preferably, a connecting seat is fixedly installed at the bottom of the connecting rod, and push plates are installed at both ends of the fixed seat. A linkage rod is fixedly installed on the inner side of each of the two push plates. One end of each linkage rod passes through the fixed seat and is connected to the connecting seat. A compression spring is slidably installed on the connecting rod, and a limit ring is fixedly installed on the outer wall of the connecting rod. The compression spring is located between the limit ring and the lower pressure plate.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] 1. This invention, through the design of the edge-cutting mechanism, can efficiently adapt to the side-cutting requirements of plastic bags used in intelligent food packaging. The sliding cooperation between the fixed rod and the detection seat allows for flexible adjustment of the distance between the two edge-cutting blades, adapting to edge-cutting operations for plastic bags of different widths, demonstrating strong versatility. The secure connection between the mounting side plate and the stable bracket ensures the stability of the edge-cutting blades during the cutting process, preventing cutting deviation and improving cutting accuracy. Furthermore, the limiting rotating seat can adjust the angle of the edge-cutting blades to meet the needs of plastic bags of different thicknesses and different cutting angles, further guaranteeing cutting quality. Simultaneously, waste generated during edge-cutting can be collected by the collection unit through the suction tube inside the mounting seat, reducing the impact of waste accumulation on processing. This not only improves the automation and efficiency of the edge-cutting operation but also ensures the regularity of the plastic bag's side-cutting, laying a good foundation for the sealing and aesthetics of subsequent food packaging.

[0020] 2. This invention, through its cutting mechanism, can accurately and efficiently cut and shape plastic bags, facilitating intelligent food packaging. It can stably stretch both sides of the plastic bag, keeping it flat and taut before cutting, effectively avoiding cutting deviations caused by wrinkles and offsets, and significantly improving cutting accuracy. Simultaneously, the height of the cutting blade can be flexibly adjusted to meet the cutting needs of plastic bags of different thicknesses. The limiting baffle further ensures adjustment stability, prevents cutting blade offset, and buffers cutting impact, protecting the cutting blade and extending its service life while making the cutting action smoother. This ensures no shaking during cutting and a flat, smooth cut surface of the plastic bag, fully meeting the stringent requirements of intelligent food packaging for dimensional accuracy and appearance regularity. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the collecting part of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the fixing base of the present invention;

[0025] Figure 5 This is a schematic diagram of the trimming mechanism of the present invention;

[0026] Figure 6 This is a structural diagram of the trimming mechanism of the present invention during disassembly;

[0027] Figure 7 This is a schematic diagram of the cutting mechanism of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the push plate of the present invention.

[0029] The components are as follows: 1. Mounting base; 2. Conveying platform; 3. Stabilizing base; 4. Hot press roller; 5. Fixing bolt; 6. Drive motor; 7. Lead screw; 8. Moving cylinder; 9. Trimming knife; 10. Fixing rod; 11. Detection base; 12. Mounting groove; 13. Fixing base; 14. Lower pressure plate; 15. Push plate; 16. Hydraulic rod; 17. Electric push rod; 18. Limiting baffle; 19. Connecting base; 20. Cutting knife; 21. Limiting retaining ring; 22. Compression spring; 23. Connecting rod; 24. Collection part; 25. Mounting side plate; 26. Stabilizing bracket; 27. Fixing slot; 28. Fixing insert rod; 29. ​​Mounting plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please refer to Figure 1 - Figure 3 An automated plastic bag forming device for intelligent food packaging includes: two mounting bases 1, a conveyor base 2 between the two mounting bases 1, a movable cylinder 8 between the two mounting bases 1, and two hot pressure rollers 4 mounted on the movable cylinder 8.

[0032] Please refer to Figure 5 and Figure 6 The edge-cutting mechanism is located between two mounting seats 1 and is used to cut the side of the plastic bag. The edge-cutting mechanism includes a fixed rod 10 fixedly installed between the two mounting seats 1 and two detection seats 11 slidably installed on the fixed rod 10. A stabilizing bracket 26 is provided on the opposite side of the two detection seats 11. A mounting side plate 25 is provided on the opposite side of the two stabilizing brackets 26. An edge-cutting knife 9 is provided at the bottom of the two mounting side plates 25. A stabilizing component is provided on one side of the mounting side plate 25 to stabilize the mounting side plate 25 and the stabilizing bracket 26. The stabilizing component includes multiple fixing slots 27 opened on the outer wall of the stabilizing bracket 26 and multiple fixing rods 28 fixedly installed at one end of the mounting side plate 25. The multiple fixing slots 27 correspond one-to-one with the multiple fixing rods 28. The multiple fixing rods 28 are located inside the multiple fixing slots 27. An adjusting component for adjusting the edge-cutting knife 9 is provided at the bottom of the mounting side plate 25.

[0033] In use, first place the two mounting seats 1 stably to ensure that the conveyor platform 2 is in a horizontal working state. The two hot pressure rollers 4 on the moving cylinder 8 can perform hot pressing and shaping on the plastic bag raw material. Then, the edge trimming mechanism is activated to trim the side of the plastic bag. First, slide and adjust the position of the two detection seats 11 along the fixed rod 10 so that the edge trimming blades 9 at the bottom of the two mounting side plates 25 are aligned with the side of the plastic bag that needs to be trimmed. Then, the mounting side plates 25 and the stable card seat 26 are firmly connected by the stabilizing component. Insert the multiple fixed rods 28 at one end of the mounting side plate 25 into the multiple fixed slots 27 on the outer wall of the stable card seat 26 to ensure that the connection between the two is tight and does not loosen, so as to avoid displacement during the trimming process and affect the trimming accuracy. If it is necessary to adapt to the trimming requirements of different specifications of plastic bags, the edge trimming blades 9 can be adjusted by the adjustment component at the bottom of the mounting side plate 25 to complete the precise trimming of the side of the plastic bag. It can also cooperate with the continuous conveying action of the conveyor platform 2 to achieve continuous trimming operation.

[0034] Furthermore, such as Figure 5 and Figure 6 As shown, the adjustment assembly includes a mounting plate 29 fixedly installed at the bottom of the mounting side plate 25 and a hydraulic rod 16 installed between the mounting plate 29 and the cutting blade 9. A limit rotating seat is provided at the bottom of the hydraulic rod 16, and the bottom of the limit rotating seat is fixed to the top of the cutting blade 9. A cutting mechanism for cutting plastic bags is provided between the two mounting seats 1. Therefore, in use, after connecting the mounting side plate 25 and the stabilizing seat 26 through the stabilizing assembly, if it is necessary to precisely adjust the height or angle of the cutting blade 9 to adapt to plastic bags of different thicknesses and cutting requirements, it can be adjusted using... To operate the adjustment assembly at the bottom of the side plate 25, first confirm that the hydraulic rod 16 between the mounting plate 29 and the cutting blade 9 is in normal working condition. Adjust the height of the cutting blade 9 by controlling the extension and retraction of the hydraulic rod 16 so that the distance between it and the plastic bag material meets the cutting requirements. Then, use the limiting rotating seat at the bottom of the hydraulic rod 16 to rotate the cutting blade 9 and adjust it to a suitable cutting angle. At the same time, the cutting mechanism between the two mounting seats 1 can cooperate with the cut plastic bag for subsequent cutting operations, ensuring that the entire processing flow is continuous and accurate, and meeting the forming requirements of plastic bags for intelligent food packaging.

[0035] Furthermore, such as Figure 1 and Figure 2 As shown, suction tubes are provided on the inner sides of both mounting bases 1, and collection sections 24 are provided on the outer sides of both mounting bases 1. One end of each suction tube passes through the mounting base 1 and is connected to the collection section 24. Based on this, during use, plastic waste is generated when the cutting blade 9 of the cutting mechanism performs side cutting on the plastic bag and the subsequent cutting operation of the cutting mechanism. At this time, the suction tubes connected to the inner sides of the two mounting bases 1 are activated, and the suction tubes generate suction to promptly absorb and collect the waste generated during the cutting and trimming process. Subsequently, the waste is transported through the suction tubes passing through the mounting bases 1 to the collection section 24 on the outer side of the mounting base 1, realizing the centralized collection of waste and preventing waste from accumulating on the conveyor base 2 or various mechanism components, which would affect the normal operation of the device and the processing accuracy of the plastic bag, thus ensuring the cleanliness and orderliness of the entire food intelligent packaging plastic bag forming and processing process.

[0036] Furthermore, such as Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, a stabilizing seat 3 is provided on the top of the two mounting bases 1. A lead screw 7 is rotatably mounted between the two stabilizing seats 3. A moving cylinder 8 is screwed to the outer wall of the lead screw 7. A power assembly is provided on one side of one of the stabilizing seats 3. The power assembly includes a drive motor 6 installed at one end of one of the stabilizing seats 3 and two fixing bolts 5 screwed onto the two stabilizing seats 3. The two stabilizing seats 3 are fixed to the two mounting bases 1 by the two fixing bolts 5. The main shaft of the drive motor 6 passes through one of the stabilizing seats 3 and is connected to the lead screw 7. Based on this, in use, the two stabilizing seats 3 are first firmly fixed to the two mounting bases 1 by the two fixing bolts 5. After securing the stable seat 3 to ensure it is firmly installed without shaking, the drive motor 6 is started. Its main shaft passes through one of the stable seats 3 and drives the lead screw 7, which is installed between the two stable seats 3, to rotate. Since the moving cylinder 8 is screwed to the outer wall of the lead screw 7, the rotation of the lead screw 7 drives the moving cylinder 8 to move smoothly along the length of the lead screw 7. This, in turn, drives the two hot press rollers 4 on the moving cylinder 8 to move synchronously, thereby flexibly adjusting the position of the hot press rollers 4 so that they are precisely aligned with the area of ​​the plastic bag material that needs to be hot-pressed. This meets the hot pressing and shaping requirements of plastic bags for intelligent food packaging of different specifications, and ensures the accuracy and stability of the hot pressing operation.

[0037] Please also refer to... Figure 7 and Figure 8The cutting mechanism includes a fixed base 13 fixedly installed between two mounting bases 1 and a cutting blade 20 installed at the bottom of the fixed base 13. A lower pressure plate 14 is slidably installed inside the fixed base 13, and two connecting rods 23 are slidably installed inside the lower pressure plate 14. Both connecting rods 23 pass through the fixed base 13 and the lower pressure plate 14. A connecting plate is fixedly installed at the bottom of the lower pressure plate 14. A slot is opened at the bottom of the fixed base 13, and the bottom of the connecting plate passes through the slot and is fixed to the top of the cutting blade 20. The inner walls of both mounting bases 1 are provided with moving components for adjusting the height of the cutting blade 20. The moving components include openings in the two mounting bases 1. The mounting base 1 has an inner mounting groove 12 and an electric push rod 17 installed inside the mounting groove 12. The top of the fixed base 13 is provided with a mounting groove 12, and the two ends of the mounting groove 12 are respectively located inside the two mounting grooves 12. The bottom of the electric push rod 17 is connected to the top of the mounting groove 12. A limit baffle 18 is fixedly installed on one side of the mounting groove 12. A connecting seat 19 is fixedly installed on the bottom of the connecting rod 23. Push plates 15 are installed at both ends of the fixed base 13. Linkage rods are fixedly installed on the inner sides of the two push plates 15. One end of the two linkage rods passes through the fixed base 13 and is connected to the connecting seat 19. A compression spring 22 is slidably installed on the connecting rod 23. A limiting ring 21 is fixedly installed on the outer wall of the rod 23, and a compression spring 22 is located between the limiting ring 21 and the lower pressure plate 14. Based on this, in use, the position of the cutting mechanism is first adjusted by moving the component, and the electric push rod 17 installed inside the mounting groove 12 on the inner side of the mounting base 1 is activated. The electric push rod 17 extends and retracts, driving the fixed base 13 to move along the mounting groove 12. The limiting baffle 18 on one side of the mounting groove 12 restricts the range of movement of the fixed base 13 to ensure accurate movement. Then, the height of the cutting blade 20 at the bottom of the fixed base 13 is adjusted to meet the cutting requirements of the plastic bag. Subsequently, the push plates 15 at both ends of the fixed base 13 drive the connecting seat through the inner linkage rod. 19 moves, and the connecting seat 19 drives the connecting rod 23 to slide inside the fixed seat 13 and the lower pressure plate 14. At the same time, the two push plates 15 pull on both sides of the plastic bag to keep the plastic bag flat and taut. The compression spring 22 on the connecting rod 23 deforms under the limiting action of the limiting ring 21, providing elastic force to the lower pressure plate 14. The lower pressure plate 14 drives the cutting blade 20 to move down smoothly through the connecting plate at the bottom. The connecting plate passes through the slot at the bottom of the fixed seat 13 to achieve smooth and precise cutting of the plastic bag. All components work together to ensure stable cutting action and neat cutting end face, meeting the forming and processing requirements of plastic bags for intelligent food packaging.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automated plastic bag forming device for intelligent food packaging, characterized in that, include: Two mounting bases (1), a conveyor base (2) is provided between the two mounting bases (1), a movable cylinder (8) is provided between the two mounting bases (1), and two hot pressure rollers (4) are provided on the movable cylinder (8). The edge trimming mechanism is located between the two mounting seats (1) and is used to trim the side of the plastic bag. The edge trimming mechanism includes a fixed rod (10) fixedly installed between the two mounting seats (1) and two detection seats (11) slidably installed on the fixed rod (10). A stabilizing bracket (26) is provided on the opposite side of the two detection seats (11). A mounting side plate (25) is provided on the opposite side of the two stabilizing brackets (26). An edge trimming knife (9) is provided at the bottom of the two mounting side plates (25). A stabilizing component is provided on one side of the mounting side plate (25) for stabilizing the mounting side plate (25) and the stabilizing bracket (26).

2. The automated plastic bag forming device for intelligent food packaging according to claim 1, characterized in that: The stabilizing component includes multiple fixing slots (27) formed on the outer wall of the stabilizing bracket (26) and multiple fixing rods (28) fixedly installed on one end of the mounting side plate (25). Each of the multiple fixing slots (27) corresponds to one of the multiple fixing rods (28), and each of the multiple fixing rods (28) is located inside the multiple fixing slots (27). The bottom of the mounting side plate (25) is provided with an adjustment component for adjusting the trimming knife (9).

3. The automated plastic bag forming device for intelligent food packaging according to claim 2, characterized in that: The adjustment assembly includes a mounting plate (29) fixedly installed at the bottom of the mounting side plate (25) and a hydraulic rod (16) installed between the mounting plate (29) and the cutting blade (9). The bottom of the hydraulic rod (16) is provided with a limiting rotating seat, the bottom of which is fixed to the top of the cutting blade (9). A cutting mechanism for cutting plastic bags is provided between the two mounting seats (1).

4. An automated plastic bag forming device for intelligent food packaging according to claim 3, characterized in that: A stabilizing seat (3) is provided on the top of the two mounting seats (1), and a lead screw (7) is rotatably installed between the two stabilizing seats (3). The moving cylinder (8) is screwed to the outer wall of the lead screw (7), and a power assembly is provided on one side of one of the stabilizing seats (3).

5. An automated plastic bag forming device for intelligent food packaging according to claim 1, characterized in that: Both of the mounting bases (1) are provided with suction tubes on their inner sides and collection parts (24) are provided on their outer sides. One end of each of the two suction tubes passes through the mounting base (1) and is connected to the collection part (24).

6. An automated plastic bag forming device for intelligent food packaging according to claim 4, characterized in that: The power assembly includes a drive motor (6) mounted on one end of one of the stabilizers (3) and two fixing bolts (5) screwed onto the two stabilizers (3).

7. An automated plastic bag forming device for intelligent food packaging according to claim 6, characterized in that: The two stabilizers (3) are fixed to the two mounting bases (1) by the two fixing bolts (5), and the main shaft of the drive motor (6) passes through one of the stabilizers (3) and is connected to the lead screw (7).

8. An automated plastic bag forming device for intelligent food packaging according to claim 3, characterized in that: The cutting mechanism includes a fixed base (13) fixedly installed between the two mounting bases (1) and a cutting blade (20) installed at the bottom of the fixed base (13). A lower pressure plate (14) is slidably installed inside the fixed base (13). Two connecting rods (23) are slidably installed inside the lower pressure plate (14). Both connecting rods (23) pass through the fixed base (13) and the lower pressure plate (14). A connecting plate is fixedly installed at the bottom of the lower pressure plate (14). A slot is opened at the bottom of the fixed base (13). The bottom of the connecting plate passes through the slot and is fixed to the top of the cutting blade (20). The inner walls of the two mounting bases (1) are provided with moving components.

9. An automated plastic bag forming device for intelligent food packaging according to claim 8, characterized in that: The movable component is used to adjust the height of the cutting blade (20). The movable component includes a mounting groove (12) opened inside the two mounting seats (1) and an electric push rod (17) installed inside the mounting groove (12). The top of the fixed seat (13) is provided with a mounting groove (12). The two ends of the mounting groove (12) are respectively located inside the two mounting grooves (12). The bottom of the electric push rod (17) is connected to the top of the mounting groove (12). A limit baffle (18) is fixedly installed on one side of the mounting groove (12).

10. An automated plastic bag forming device for intelligent food packaging according to claim 8, characterized in that: A connecting seat (19) is fixedly installed at the bottom of the connecting rod (23). Push plates (15) are installed at both ends of the fixed seat (13). Linkage rods are fixedly installed on the inner sides of the two push plates (15). One end of the two linkage rods passes through the fixed seat (13) and is connected to the connecting seat (19). A compression spring (22) is slidably installed on the connecting rod (23). A limit ring (21) is fixedly installed on the outer wall of the connecting rod (23). The compression spring (22) is located between the limit ring (21) and the lower pressure plate (14).

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