Traditional Chinese medicine decoction piece cutting device

Abstract

The utility model relates to the technical field of traditional Chinese medicine slicing, and discloses a traditional Chinese medicine decoction piece cutting device which comprises a rack and a cutting platform, conveying devices are arranged at the front end and the rear end of the cutting platform, a reciprocating cutting mechanism is arranged on the rear portion of the cutting platform, and a positioning guide-in mechanism is arranged on the cutting platform on the front side of the reciprocating cutting mechanism. Sliding rails are arranged on the cutting platform on the left side and the right side of the conveying device correspondingly, and medicinal material limiting mechanisms sliding front and back along the sliding rails are arranged on the two sliding rails. The automatic medicinal material cutting device is simple in structure and suitable for cutting medicinal materials with large rhizomes, the conveying device is matched with the reciprocating cutting mechanism, conveying and cutting of the medicinal materials can be automatically achieved, the positioning guide-in mechanism arranged on the cutting platform is matched with the medicinal material limiting mechanism, the stability during cutting of the medicinal materials with the large rhizomes can be improved, and the cutting efficiency is improved. Shaking and flying of the rhizomes are effectively avoided, the quality of the medicinal materials during cutting is further guaranteed, and meanwhile the large-rhizome medicinal materials can be collected on the transmission belt to be sliced.

Description

Technical Field

[0001] The utility model relates to the technical field of medicinal material cutting, in particular to a Chinese medicinal material slice cutting device. Background Art

[0002] Chinese herbal medicine pieces occupy a core position in the clinical treatment of traditional Chinese medicine. They are products obtained by specific processing and preparation of Chinese herbal medicines based on the theory and processing methods of traditional Chinese medicine. Chinese herbal medicine pieces include not only original herbal medicine pieces, but also pieces made by various cutting and processing techniques. Common varieties of Chinese herbal medicine pieces include kudzu root, dried ginger, roasted ginger, rhubarb, astragalus, roasted astragalus, and polygonum multiflorum.

[0003] In the production process of Chinese herbal medicine slices, slicing is a crucial preliminary processing link. It plays a fundamental role in ensuring the quality of Chinese herbal medicine slices and the subsequent use effect. However, the slicing devices currently used in the market for the production of large rhizome Chinese herbal medicine slices have some defects and shortcomings.

[0004] First, existing slicing devices often cannot stably cut Chinese herbal rhizomes, which directly affects the quality and consistency of the slices. Second, these devices cannot effectively organize and store messy rhizomes during the cutting process, which increases the complexity and workload of the operation. In addition, due to the large vibration amplitude of the rhizomes or branches during cutting, it not only affects the quality of the slices, but also may cause splashing and cause safety accidents.

[0005] Therefore, in view of these problems existing in the prior art, a new type of slicing device is needed, which can stably cut rhizomes and gather messy rhizomes during the cutting process to improve the slicing quality and eliminate potential safety hazards. Utility Model Content

[0006] The utility model aims to solve the above problems and provide a Chinese medicine slice cutting device which is suitable for cutting medicinal materials with larger rhizomes and has a stable structure.

[0007] In order to achieve the above-mentioned purpose, the utility model discloses a Chinese medicine slice cutting device, comprising a frame and a cutting platform arranged on the upper end of the frame, and its structural characteristics are that conveying devices are arranged at the front and rear ends of the cutting platform, a reciprocating cutting mechanism is arranged at the rear of the cutting platform, a positioning and introducing mechanism cooperating with the conveying device is arranged on the cutting platform on the front side of the reciprocating cutting mechanism, and slide rails adapted to the conveying direction of the conveying device are respectively arranged on the cutting platforms on the left and right sides of the conveying device, and medicinal material limiting mechanisms sliding back and forth along the slide rails are arranged on the two slide rails.

[0008] After adopting the above structure, the transportation and cutting of medicinal materials can be automatically realized through the cooperation of the conveying device and the reciprocating cutting mechanism, and the positioning and introduction mechanism arranged on the cutting platform cooperates with the medicinal material limiting mechanism, which can provide stability when cutting large rhizomes of medicinal materials, effectively avoid the shaking and flying of the rhizomes and further ensure the quality of the medicinal materials when cutting. At the same time, the large rhizomes of medicinal materials can also be gathered on the transmission belt for slicing.

[0009] Preferably, the frame is a rectangular frame structure composed of multiple strip baffles, the cutting platform is a rectangular plate body arranged in the horizontal direction, and multiple support bases are arranged at the bottom of the rectangular plate body, the multiple support bases are respectively arranged at the four corners of the upper end surface of the frame, and the upper and lower ends of the support bases are respectively fixed to the upper end surface of the frame and the lower end surface of the cutting platform. The frame of the rectangular frame structure cooperates with the multiple support bases to effectively ensure the stability of the cutting platform when cutting medicinal materials.

[0010] Preferably, the conveying device includes two U-shaped fixing frames respectively fixed at the front and rear ends of the cutting platform, the two U-shaped fixing frames are arranged opposite to each other and are provided with corresponding driving rollers, the two driving rollers are provided with a conveyor belt covering the cutting platform, and the U-shaped fixing frame at the front end of the cutting platform is provided with a conveying motor for controlling the rotation of the driving roller. By arranging the U-shaped fixing frames and driving rollers at the front and rear ends of the cutting platform and matching with the conveyor belt, the conveyor belt is extended out of the cutting platform, which can effectively facilitate the taking and placing of the rhizomes of Chinese medicinal materials.

[0011] Preferably, the reciprocating cutting mechanism includes a driving motor arranged at the lower part of the frame, and the driving rod of the driving motor is arranged along the front-back direction of the frame, and a connecting rod device is arranged at the front end of the driving rod, and a cutting frame is arranged on the connecting rod device along the vertical direction and passing through the cutting platform, and a slicing knife is arranged on the cutting frame. The slicing knife on the cutting frame is driven to reciprocate up and down by cooperating with the connecting rod device and the driving motor, which can effectively improve the cutting force and adapt to Chinese medicinal rhizomes with different diameters.

[0012] Preferably, the connecting rod device includes a first connecting rod fixedly connected to the front end of the driving rod and perpendicular to the driving rod, the other end of the first connecting rod is hinged to the second connecting rod and hinged to the inner end of the second connecting rod, the outer end of the second connecting rod is hinged to the third connecting rod and the hinge between the third connecting rod and the second connecting rod is located in the middle of the third connecting rod.

[0013] Preferably, the cutting frame includes two positioning rods which are arranged at intervals and pass through the cutting platform in the vertical direction. The left and right ends of the slicing knife are mounted on the positioning rod body located on the upper side of the cutting platform. A positioning device matching the slicing knife is provided on the rod body near the upper part of the positioning rod.

[0014] Preferably, the positioning device comprises a positioning cylinder sleeved on the positioning rod, and a first return spring sleeved on the positioning rod is arranged in the positioning cylinder, a fixing bolt passing through the positioning cylinder and the positioning rod in the horizontal direction is arranged on the upper part of the positioning cylinder, and a rectangular opening adapted to the slicing knife is arranged on the opposite side walls of the two positioning cylinders, and the end of the slicing knife is mounted on the rod body of the positioning rod in the rectangular opening. The positioning device cooperates with the slicing knife, so that the slicing knife can move up and down with the positioning rod, and the first return spring cooperates with the slicing knife to avoid damage caused by interference between the slicing knife and the conveyor belt.

[0015] Preferably, the positioning introduction mechanism includes two vertical plates arranged at intervals along the left and right directions of the cutting platform and fixed vertically on the cutting platform, a horizontal plate connecting the two vertical plates is arranged at the upper ends of the two vertical plates, two pressing rollers arranged side by side are arranged between the two vertical plates below the horizontal plate, a connecting frame connecting the rotating shafts of the two pressing rollers is arranged at the same end of the two pressing rollers, a positioning column passing through the horizontal plate is arranged on the upper end surface of the connecting frame, a second return spring clamped between the connecting frame and the horizontal plate is sleeved on the main body of the positioning column located below the horizontal plate, and a limiting sleeve is screwed on the positioning column located above the horizontal plate. The positioning introduction mechanism cooperates with the conveying device to enhance the stability of the medicinal material rhizome when cutting.

[0016] Preferably, the medicinal material limiting mechanism comprises limiting frames respectively arranged on two slide rails, the upper ends of the two limiting frames are provided with reinforcing plates connecting the two ends, the reinforcing plates are provided with a pull rod passing through the reinforcing plates in the vertical direction and the length of the pull rod is greater than the height of the limiting frame, the lower end of the pull rod is fixedly connected with a pressing plate arranged in the horizontal direction and adapted to the interval between the two limiting frames, the upper end surface of the pressing plate and the positions near the left and right ends are respectively provided with limiting columns passing through the reinforcing plates, the limiting column body located below the reinforcing plate is sleeved with a third return spring clamped on the reinforcing plate and the pressing plate, and a clamping block is provided on the limiting column body located above the reinforcing plate. The pressing plate and the limiting frame on the medicinal material limiting mechanism can facilitate the centralized compaction of medicinal materials and move with the conveyor belt, which can effectively prevent the up and down jumping and waste of medicinal materials when cutting herbs.

[0017] To sum up, the beneficial effects of the utility model are: the utility model has a simple structure and is suitable for cutting medicinal materials with larger rhizomes. Through the cooperation of the conveying device and the reciprocating cutting mechanism, the conveying and cutting of the medicinal materials can be automatically realized, and the positioning and introduction mechanism arranged on the cutting platform cooperates with the medicinal material limiting mechanism, which can provide stability during the cutting of large rhizomes of medicinal materials, effectively avoid the shaking and flying of the rhizomes and further ensure the quality of the medicinal materials during cutting. At the same time, the large rhizomes of medicinal materials can be gathered on the transmission belt for slicing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0020] Figure 3 It is a schematic structural diagram of the utility model from the side.

[0021] In the figure: 1. frame; 2. cutting platform; 3. conveying device; 4. reciprocating cutting mechanism; 5. positioning introduction mechanism; 6. slide rail; 7. medicinal material limiting mechanism; 8. supporting base; 9. U-shaped fixing frame; 10. driving roller; 11. conveyor belt; 12. conveying motor; 13. driving motor; 14. connecting rod device; 15. cutting frame; 16. slicing knife; 17. first connecting rod; 18. second connecting rod; 19. third connecting rod; 20. positioning rod; 21. positioning device; 22. positioning cylinder; 23. first return spring; 24. fixing bolt; 25. rectangular opening; 26. pressing roller; 27. connecting frame; 28. positioning column; 29. ​​second return spring; 30. limiting sleeve; 31. limiting frame; 32. reinforcing plate; 33. pull rod; 34. pressing plate; 35. limiting column; 36. third return spring; 37. block. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0026] like Figure 1 and Figure 2As shown, the utility model includes a frame 1 and a cutting platform 2 arranged on the upper end of the frame 1, and a conveying device 3 is arranged at the front and rear ends of the cutting platform 2. When designing, the frame 1 is a rectangular frame structure composed of multiple strip baffles, and the above-mentioned cutting platform 2 is a rectangular plate body arranged in the horizontal direction and a plurality of supporting bases 8 are arranged at the bottom of the rectangular plate body. When manufacturing, the multiple supporting bases 8 are respectively arranged at the four corners of the upper end surface of the frame 1 and the upper and lower ends of the supporting bases 8 are respectively welded to the upper end surface of the frame 1 and the lower end surface of the cutting platform 2, so that the frame 1 with a rectangular frame structure cooperates with the multiple supporting bases 8, which can effectively ensure the stability of the cutting platform 2 when cutting medicinal materials. The above-mentioned conveying device 3 includes two U-shaped fixing frames 9 respectively fixed at the front and rear ends of the cutting platform 2, wherein the two U-shaped fixing frames 9 are arranged opposite to each other and corresponding driving rollers 10 are arranged on the U-shaped fixing frames 9, and a conveyor belt 11 covering the cutting platform 2 is arranged on the two driving rollers 10. The structure and installation method of the conveyor belt 11 are well-known structures and are not described here. During design, the U-shaped fixing frame 9 includes two cross bars attached to the left and right sides of the cutting platform 2 and the cross bars extend out of the outer end edges of the cutting platform 2. The outer ends of the two cross bars are connected with connecting rods. At the same time, a baffle with a shape adapted to the baffle is arranged on the lower end surface of the U-shaped fixing frame 9. The above-mentioned driving rollers 10 are fixed on the side plates on the left and right sides of the U-shaped fixing frame 9 at both ends in the horizontal direction. A conveying motor 12 for controlling the rotation of the driving rollers 10 is also arranged on the U-shaped fixing frame 9 at the front end of the cutting platform 2. In this way, the U-shaped fixing frame 9 and the driving roller 10 are arranged at the front and rear ends of the cutting platform 2 and matched with the conveyor belt 11, so that the conveyor belt 11 extends out of the cutting platform 2, which can effectively facilitate the placement of the Chinese medicinal rhizomes.

[0027] like Figure 1 and Figure 3As shown, in a preferred embodiment of the utility model, a reciprocating cutting mechanism 4 is arranged at the rear of the cutting platform 2, and the reciprocating cutting mechanism 4 includes a driving motor 13 arranged at the lower part of the frame 1, and the driving rod of the driving motor 13 is arranged along the front and rear direction of the frame 1, and a connecting rod device 14 is arranged at the front end of the driving rod, and a cutting frame 15 along the vertical direction and passing through the cutting platform 2 is also arranged on the connecting rod device 14, and a slicing knife 16 is arranged on the cutting frame 15. When designed, the connecting rod device 14 includes a first connecting rod 17 fixedly connected to the front end of the driving rod and perpendicular to the driving rod, and the other end of the first connecting rod 17 is hinged with a second The connecting rod 18 is hinged to the inner end of the second connecting rod 18, and a third connecting rod 19 is hinged to the outer end of the second connecting rod 18, and the hinge between the third connecting rod 19 and the second connecting rod 18 is located at the middle of the third connecting rod 19. The above-mentioned cutting frame 15 includes two positioning rods 20 that are arranged at intervals and pass through the cutting platform 2 in the vertical direction. The two positioning rods 20 are respectively installed at the left and right end positions of the third connecting rod 19, wherein the left and right ends of the slicing knife 16 are mounted on the rod body of the positioning rod 20 located on the upper side of the cutting platform 2, and a positioning device 21 matching the slicing knife 16 is arranged on the rod body near the upper part of the positioning rod 20. During manufacture, the positioning device 21 includes a positioning cylinder 22 sleeved on the positioning rod 20, and a first return spring 23 sleeved on the positioning rod 20 is arranged in the positioning cylinder 22, and a fixing bolt 24 is arranged on the upper part of the positioning cylinder 22, which passes through the positioning cylinder 22 and the positioning rod 20 in the horizontal direction, and a rectangular opening 25 adapted to the slicing knife 16 is arranged on the opposite side walls of the two positioning cylinders 22, and the end state of the slicing knife 16 is installed on the rod body of the positioning rod 20 in the rectangular opening 25, so that the positioning cylinder 22 can move up and down following the driving rod, so that the slicing knife 16 whose end is stuck in the rectangular opening 25 can also move up and down. The positioning device 21 cooperates with the slicing knife 16, so that the slicing knife 16 can move up and down with the positioning rod 20, and the first return spring 23 cooperates with the slicing knife 16 to avoid damage caused by the interference between the slicing knife 16 and the conveyor belt 11.

[0028] like Figure 1 and Figure 2As shown, in another preferred embodiment of the utility model, a positioning and introducing mechanism 5 cooperating with the conveying device 3 is arranged on the cutting platform 2 on the front side of the reciprocating cutting mechanism 4, and the positioning and introducing mechanism 5 includes two vertical plates arranged at intervals along the left and right directions of the cutting platform 2 and fixed vertically on the cutting platform 2, and a horizontal plate connecting the two vertical plates is arranged at the upper ends of the two vertical plates, and two side-by-side pressing rollers 26 are arranged between the two vertical plates below the horizontal plate, and the pressing rollers 26 and the conveying direction of the conveyor belt 11 are mutually perpendicular, and a connecting frame 27 connecting the rotating shafts of the two pressing rollers 26 is arranged at the same end of the two pressing rollers 26, and a positioning column 28 passing through the horizontal plate is arranged on the upper end surface of the connecting frame 27, and a second return spring 29 clamped between the connecting frame 27 and the horizontal plate is sleeved on the body of the positioning column 28 located below the horizontal plate, and a limiting sleeve 30 is screwed on the positioning column 28 located above the horizontal plate. By cooperating with the conveying device 3, it can adapt to the cutting of medicinal materials with different rhizomes and enhance the stability of the cutting of medicinal rhizomes.

[0029] like Figure 1 and Figure 2 As shown, in a specific embodiment of the utility model, slide rails 6 adapted to the conveying direction of the conveying device 3 are respectively arranged on the cutting platforms 2 on the left and right sides of the conveying device 3, and medicinal material limiting mechanisms 7 sliding forward and backward along the slide rails 6 are arranged on the two slide rails 6. When designed, the medicinal material limiting mechanisms 7 include limiting frames 31 respectively arranged on the two slide rails 6, and the upper ends of the two limiting frames 31 are provided with reinforcing plates 32 connecting the two ends, and the lower ends of the two limiting frames 31 are slidably connected to the slide rails 6, and the reinforcing plates 32 are provided with reinforcing plates passing through the reinforcing plates in the vertical direction. The pull rod 33 of the plate 32 has a length greater than the height of the limiting frame 31. The lower end of the pull rod 33 is fixedly connected with a pressing plate 34 arranged in the horizontal direction and adapted to the interval between the two limiting frames 31. The upper end surface of the pressing plate 34 and the positions near the left and right ends are respectively provided with limiting columns 35 passing through the reinforcing plate 32. The limiting column 35 body located below the reinforcing plate 32 is sleeved with a third return spring 36 clamped on the reinforcing plate 32 and the pressing plate 34. The limiting column 35 body located above the reinforcing plate 32 is provided with a clamping block 37. In this way, the pressing plate 34 and the limiting frame 31 on the medicinal material limiting mechanism 7 can facilitate the centralized compaction of medicinal materials and move with the conveyor belt 11, which can effectively prevent the up and down jumping and waste of medicinal materials when cutting medicinal herbs.

[0030] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A Chinese herbal medicine slice cutting device, comprising a frame (1) and a cutting platform (2) arranged on the upper end of the frame (1), characterized in that: Conveying devices (3) are arranged at the front and rear ends of the cutting platform (2); a reciprocating cutting mechanism (4) is arranged at the rear of the cutting platform (2); a positioning introduction mechanism (5) cooperating with the conveying device (3) is arranged on the cutting platform (2) in front of the reciprocating cutting mechanism (4); slide rails (6) adapted to the conveying direction of the conveying device (3) are arranged on the cutting platforms (2) on the left and right sides of the conveying device (3); and medicinal material limiting mechanisms (7) sliding forward and backward along the slide rails (6) are arranged on the two slide rails (6).

2. The Chinese medicine slice cutting device according to claim 1, characterized in that: The frame (1) is a rectangular frame structure formed by a plurality of strip baffles, the cutting platform (2) is a rectangular plate body arranged in a horizontal direction, and a plurality of support bases (8) are arranged at the bottom of the rectangular plate body, the plurality of support bases (8) are respectively arranged at four corners of the upper end surface of the frame (1), and the upper and lower ends of the support bases (8) are respectively fixed to the upper end surface of the frame (1) and the lower end surface of the cutting platform (2).

3. The Chinese medicine slice cutting device according to claim 1, characterized in that: The conveying device (3) comprises two U-shaped fixing frames (9) respectively fixed at the front and rear ends of the cutting platform (2), the two U-shaped fixing frames (9) are arranged opposite to each other and corresponding driving rollers (10) are arranged on the U-shaped fixing frames (9), a conveying belt (11) covering the cutting platform (2) is arranged on the two driving rollers (10), and a conveying motor (12) for controlling the rotation of the driving rollers (10) is arranged on the U-shaped fixing frame (9) located at the front end of the cutting platform (2).

4. The Chinese medicine slice cutting device according to claim 1, characterized in that: The reciprocating cutting mechanism (4) comprises a driving motor (13) arranged at the bottom of the frame (1), and a driving rod of the driving motor (13) is arranged along the front-rear direction of the frame (1), a connecting rod device (14) is arranged at the front end of the driving rod, and a cutting frame (15) is arranged on the connecting rod device (14) along the vertical direction and passing through the cutting platform (2), and a slicing knife (16) is arranged on the cutting frame (15).

5. The Chinese medicine slice cutting device according to claim 4, characterized in that: The connecting rod device (14) comprises a first connecting rod (17) fixed to the front end of the driving rod and perpendicular to the driving rod, the other end of the first connecting rod (17) is hinged to a second connecting rod (18) and is hinged to the inner end of the second connecting rod (18), the outer end of the second connecting rod (18) is hinged to a third connecting rod (19), and the hinge point between the third connecting rod (19) and the second connecting rod (18) is located at the middle of the third connecting rod (19).

6. The Chinese medicine slice cutting device according to claim 4, characterized in that: The cutting frame (15) comprises two positioning rods (20) which are arranged at intervals and pass through the cutting platform (2) in the vertical direction. The left and right ends of the slicing knife (16) are mounted on the rod body of the positioning rod (20) located on the upper side of the cutting platform (2). A positioning device (21) matching the slicing knife (16) is arranged on the rod body near the upper part of the positioning rod (20).

7. The Chinese herbal medicine slice cutting device according to claim 6, characterized in that: The positioning device (21) comprises a positioning cylinder (22) sleeved on the positioning rod (20), and a first return spring (23) sleeved on the positioning rod (20) is arranged in the positioning cylinder (22), a fixing bolt (24) passing through the positioning cylinder (22) and the positioning rod (20) in a horizontal direction is arranged on the upper part of the positioning cylinder (22), and a rectangular opening (25) adapted to the slicing knife (16) is arranged on the opposite side walls of the two positioning cylinders (22), and the end of the slicing knife (16) is mounted on the rod body of the positioning rod (20) in the rectangular opening (25).

8. The Chinese medicine slice cutting device according to claim 1, characterized in that: The positioning and introducing mechanism (5) comprises two vertical plates arranged at intervals along the left-right direction of the cutting platform (2) and fixed vertically to the cutting platform (2); a horizontal plate connecting the two vertical plates is arranged at the upper ends of the two vertical plates; two pressing rollers (26) arranged side by side are arranged between the two vertical plates below the horizontal plate; a connecting frame (27) connecting the rotating shafts of the two pressing rollers (26) is arranged at the same end of the two pressing rollers (26); a positioning column (28) passing through the horizontal plate is arranged on the upper end surface of the connecting frame (27); a second return spring (29) clamped between the connecting frame (27) and the horizontal plate is sleeved on the main body of the positioning column (28) located below the horizontal plate; and a limiting sleeve (30) is screwed on the positioning column (28) located above the horizontal plate.

9. The Chinese medicine slice cutting device according to claim 1, characterized in that: The medicinal material limiting mechanism (7) comprises limiting frames (31) respectively arranged on two slide rails (6), the upper ends of the two limiting frames (31) are provided with reinforcing plates (32) connecting the two ends, the reinforcing plates (32) are provided with a pull rod (33) passing through the reinforcing plates (32) in a vertical direction, and the length of the pull rod (33) is greater than the height of the limiting frame (31), the lower end of the pull rod (33) is fixedly connected with a pressing plate (34) arranged in a horizontal direction and adapted to the interval between the two limiting frames (31), the upper end surface of the pressing plate (34) and the positions close to the left and right ends are respectively provided with limiting columns (35) passing through the reinforcing plates (32), the limiting column (35) located below the reinforcing plates (32) is sleeved with a third return spring (36) clamped on the reinforcing plates (32) and the pressing plates (34), and the limiting column (35) located above the reinforcing plates (32) is provided with a clamping block (37).

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