Handheld positioning and clamping tool for diagnosis and examination of animal husbandry and veterinary medicine

Abstract

The invention belongs to the technical field of animal husbandry inspection, and particularly relates to a handheld positioning and clamping tool for animal husbandry veterinary diagnosis and inspection, which comprises a first frame rod and a second frame rod which are in mirror symmetry, the first frame rod and the second frame rod are connected through a middle column and a pair of fixing columns, and the pair of fixing columns are symmetrically distributed on the two sides of the middle column; a first forceps rod and a second forceps rod which can rotate around the middle column are arranged on the middle column, a first handle is jointly fixed to the top ends of the two first forceps rods, a second handle is jointly fixed to the top ends of the two second forceps rods, side plates are arranged on the opposite faces of the first frame rod and the second frame rod, and leg fixing assemblies are arranged on the side plates. A head fixing assembly is arranged at the top of the first frame rod. The tool provided by the invention has the function similar to that of pliers, so that the animal can be conveniently caught through the tool, the preliminary control effect is achieved, then the legs and the head of the animal are fixed on the premise of preliminary control, and great convenience is brought.

Description

Technical Field

[0001] The present invention relates to the technical field of livestock inspection, and particularly to a handheld positioning and clamping tool for livestock veterinary diagnosis and inspection. Background Art

[0002] Livestock refers to the physiological functions of animals such as livestock and poultry that have been artificially domesticated by humans, or wild animals such as deer, musk deer, foxes, minks, otters, and quails. Through artificial breeding and reproduction, it enables plants such as forage and feed to be converted into animal energy, in order to obtain livestock products such as meat, eggs, milk, wool, cashmere, hides, silk, and medicinal materials.

[0003] In today's livestock field, the breeding of cattle and sheep occupies an important part. During the breeding process of cattle and sheep, since young cattle and sheep have relatively low resistance, they often need to be physically examined. When being examined, cattle and sheep may move around, and need to be fixed. The existing methods are to fix the animals on a special fixing table, which has the following problems. Firstly, it is inconvenient to catch the animals. Secondly, during the fixing process, the animals will be very obviously frightened and move around, making the fixing process inconvenient. Therefore, in view of this problem, an improvement is made, and a handheld positioning and clamping tool for livestock veterinary diagnosis and inspection is proposed. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a handheld positioning and clamping tool for livestock veterinary diagnosis and inspection.

[0005] The handheld positioning and clamping tool for livestock veterinary diagnosis and inspection proposed by the present invention includes a first rack and a second rack that are mirror-symmetric. The first rack and the second rack are connected by an intermediate column and a pair of fixing columns. The pair of fixing columns are symmetrically distributed on both sides of the intermediate column. A pair of first clamping rods and second clamping rods that can rotate around the intermediate column are arranged on the intermediate column. The tops of the two first clamping rods are jointly fixed with a first handle, and the tops of the two second clamping rods are jointly fixed with a second handle. On the opposite sides of the first rack and the second rack, there are side plates, and leg fixing components are arranged on the side plates. A head fixing component is arranged at the top of the first rack; when both hands hold the first handle and the second handle respectively, the entire tool can be lifted, then the tool is moved above the animal, and then the first clamping rod and the second clamping rod are opened by both hands and the tool is moved downward. When the first clamping rod and the second clamping rod are respectively located on the sides of the animal's body, the animal's body can be clamped by controlling the first clamping rod and the second clamping rod with both hands, and in this way, the animal has been basically controlled. Then, only the legs of the animal need to be fixed one by one through the leg fixing component, and then the head of the animal is fixed through the head fixing component. In this way, when examining, the tool can be horizontally placed on the ground, and the animal can be adjusted to maintain a side-lying or lying-flat posture, so as to facilitate the veterinarian to conduct examinations from multiple angles.

[0006] Preferably, the leg fixing assembly includes a U-shaped leg sleeve passing through the side plate. A connecting plate is fixedly connected to both ends of the leg sleeve. A lead screw threadedly connected to the connecting plate is rotatably connected to the outer side of the side plate. A turning handle is fixed to the end of the lead screw. Place the animal's leg into the leg sleeve, and then rotate the lead screw by turning the turning handle. The lead screw will gradually tighten the leg sleeve towards the side plate, thereby fixing the leg.

[0007] Preferably, both the middle column and the fixed column are fixedly connected to the second rod. The first clamping rod and the second clamping rod are both rotatably connected to the middle column.

[0008] Preferably, the ends of both the middle column and the fixed column pass through the second rod. A first nut and a second nut for respectively pressing against both sides of the second rod are threadedly connected to one end of the middle column close to the second rod. The first clamping rod and the second clamping rod are both sleeved on the middle column. First, rotate the first nut towards the first rod, then move the second rod, the first clamping rod and the second clamping rod along the middle column towards the first rod, and finally rotate the second nut towards the second rod until it presses against the second rod. In this way, the length between the first rod and the second rod can be adjusted, so that it can be used for smaller animals.

[0009] Preferably, a shaft rod is rotatably connected to both the first rod and the second rod. Synchronous wheels are fixedly sleeved on the adjacent ends of the shaft rod and the lead screw. The two synchronous wheels in the same group are connected by a synchronous belt. When one of the lead screws is rotated, the shaft rod can be driven to rotate through the transmission cooperation of the synchronous wheels and the synchronous belt, and then the other lead screw can be driven to rotate through the shaft rod. In this way, the two front legs or hind legs of the animal can be fixed simultaneously, making the operation of the tool more convenient.

[0010] Preferably, the head fixing assembly includes a U-shaped head sleeve. A pair of circular holes for inserting the head sleeve are opened at the top of the first rod. A handle is fixed to the top end of the head sleeve. The head sleeve is connected with a positioning assembly. Place the animal's head between the first rod and the head sleeve, and then lift the head sleeve upward until the head sleeve and the first rod cooperate to fix the animal's neck, thereby fixing its head. Finally, fix the head sleeve at this position through the positioning assembly.

[0011] Preferably, the positioning assembly includes a pair of ear seats fixed to the top of the first rod. An insertion rod passes through between the two ear seats. Multiple groups of insertion holes for the insertion rod to pass through are evenly distributed up and down on the head sleeve. After lifting the head sleeve to a proper position, insert the insertion rod between the two ear seats and make the insertion rod insert into a corresponding insertion hole, then the head sleeve can be fixed at this position.

[0012] Preferably, the positioning assembly includes a U-shaped push rod that is slidably connected to the first rod and supports the bottom of the headgear. The push rod is connected to a lifting structure. By means of the lifting structure, the push rod is lifted upward, and then the push rod will synchronously lift the headgear upward, thereby finally fixing the headgear in a proper position.

[0013] Preferably, the lifting structure includes a pair of bearing seats fixed to the inner side of the push rod. A shaft column is rotatably connected to the bearing seats. The top end of the shaft column passes through the push rod and is rotatably connected to the first rod. Conical gears are fixedly sleeved on the adjacent ends of the shaft column and the shaft rod. The two conical gears in the same group are meshed and connected. When the shaft rod rotates, it will drive the shaft column to rotate through the meshing transmission of the two conical gears. Then the shaft column will lift the push rod upward and fix it in a proper position.

[0014] Preferably, the lifting structure includes a pair of ear blocks fixed to the inner side of the push rod. A pull rope is fixed to the top end of the ear block. The other end of the pull rope passes through the push rod and is fixed to a winding drum. Both winding drums are fixedly sleeved on the shaft rod. A pair of hanging posts for hanging the pull rope are rotatably connected to the inner side of the first rod. A guide sleeve is fixed to one side of the first rod. A stop rod is inserted into the guide sleeve. A guide post is inserted into the back of the stop rod. The bottom end of the guide post is fixedly connected to the guide sleeve. A spring is sleeved on the guide post. Both ends of the spring are fixedly connected to the guide sleeve and the stop rod respectively. A ratchet is fixedly sleeved on the shaft rod. The bottom end of the stop rod can be inserted into the tooth gap of the ratchet. When the shaft rod rotates, it will synchronously drive the winding drum to rotate. Then the winding drum will gradually wind up the pull rope. The push rod can be lifted upward by the other end of the pull rope. And when the shaft rod rotates forward, it will synchronously drive the ratchet to rotate. The teeth of the ratchet will push the stop rod upward. In this way, the forward rotation of the shaft rod will not be affected. On the contrary, due to the restriction of the stop rod, the ratchet cannot rotate backward. Thus, the headgear is fixed in a proper position. When it is necessary to rotate the shaft rod backward, just lift the stop rod upward and then rotate the shaft rod.

[0015] Compared with the prior art, the present invention provides a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination, having the following beneficial effects: 1. For a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination, by setting the first clamp rod and the second clamp rod, the animal's body can be first clamped by controlling the first clamp rod and the second clamp rod with both hands, so that the animal is basically controlled. Then, the legs of the animal are fixed one by one through the leg fixing assembly. Then, the head of the animal is fixed through the head fixing assembly. Thus, the fixing process of the animal becomes much more convenient.

[0016] 2. A handheld positioning and clamping tool for livestock and veterinary diagnosis and examination. By setting synchronous wheels, when one of the lead screws is rotated, the shaft can be driven to rotate through the transmission cooperation of the synchronous wheels and the synchronous belt, and then the other lead screw can be driven to rotate by the shaft. In this way, the two front legs or hind legs of the animal can be fixed simultaneously, making the operation of the tool more convenient.

[0017] 3. A handheld positioning and clamping tool for livestock and veterinary diagnosis and examination. By setting a lifting structure and a push rod, when fixing the front legs, the push rod can be lifted upward through the lifting structure, and then the push rod will synchronously lift the headgear upward, finally fixing the headgear in a suitable position. In this way, the two front legs and the head of the animal can be fixed simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination proposed by the present invention; Figure 2 FIG. is a schematic diagram of the installation structure of the first tong rod and the second tong rod of a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination proposed by the present invention; Figure 3 FIG. is a schematic diagram of the installation structure of the headgear and the leg sleeve of a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination proposed by the present invention; Figure 4 FIG. is a schematic diagram of the installation structure of the second support rod and the middle column of a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination proposed by the present invention; Figure 5 FIG. is a schematic diagram of the installation structure of the push rod of a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination proposed by the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at A; Figure 7 For the present invention Figure 5 Schematic diagram of the enlarged structure at B; Figure 8 FIG. is a schematic diagram of the installation structure of the reel of a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination proposed by the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at C; Figure 10 For the present invention Figure 8 Schematic diagram of the enlarged structure at D.

[0019] In the figure: 1. First support rod; 2. Second support rod; 3. Fixed column; 4. Intermediate column; 5. First clamping rod; 6. First handle; 7. Second clamping rod; 8. Second handle; 9. Side plate; 10. Leg sleeve; 11. Connecting plate; 12. Lead screw; 13. Turning handle; 14. First nut; 15. Second nut; 16. Round hole; 17. Head sleeve; 18. Grip; 19. Ear seat; 20. Insertion rod; 21. Insertion hole; 22. Synchronous pulley; 23. Shaft rod; 24. Synchronous belt; 25. Push rod; 26. Bearing seat; 27. Shaft column; 28. Bevel gear; 29. Ear block; 30. Pulling rope; 31. Hanging column; 32. Reel; 33. Ratchet; 34. Guide sleeve; 35. Stop rod; 36. Guide post; 37. Spring. Detailed implementation manners

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0022] Referring to Figures 1 - 10 , a handheld positioning and clamping tool for livestock and veterinary diagnosis and examination, includes a first support rod 1 and a second support rod 2 that are mirror-symmetrical. The first support rod 1 and the second support rod 2 are connected by an intermediate column 4 and a pair of fixed columns 3. The pair of fixed columns 3 are symmetrically distributed on both sides of the intermediate column 4. A pair of first clamping rods 5 and second clamping rods 7 that can rotate around the intermediate column 4 are arranged on the intermediate column 4. The tops of the two first clamping rods 5 are jointly fixed with a first handle 6, and the tops of the two second clamping rods 7 are jointly fixed with a second handle 8. Side plates 9 are provided on the opposite sides of the first support rod 1 and the second support rod 2, and a leg fixing assembly is arranged on the side plates 9. A head fixing assembly is arranged at the top of the first support rod 1; In use, the entire tool can be lifted by holding the first handle 6 and the second handle 8 with both hands respectively. Then, the tool is moved above the animal. Next, the first clamping rod 5 and the second clamping rod 7 are opened by both hands and the tool is moved downward. When the first clamping rod 5 and the second clamping rod 7 are respectively located on the sides of the animal's body, the animal's body can be clamped by controlling the first clamping rod 5 and the second clamping rod 7 with both hands. In this way, the animal has been basically controlled. Then, only the legs of the animal need to be fixed one by one through the leg fixing assembly, and then the head of the animal is fixed through the head fixing assembly. In this way, when checking, the tool can be horizontally placed on the ground, and the animal can be adjusted to maintain a side-lying or lying-flat posture, so as to facilitate the veterinarian to check from multiple angles.

[0023] Among them, the leg fixing assembly includes a U-shaped leg sleeve 10 passing through the side plate 9. Both ends of the leg sleeve 10 are fixedly connected with a connecting plate 11. A lead screw 12 threadedly connected with the connecting plate 11 is rotatably connected to the outside of the side plate 9. A turning handle 13 is fixed to the end of the lead screw 12. In use, the leg of the animal is placed into the leg sleeve 10, and then the lead screw 12 is rotated by the turning handle 13. The lead screw 12 will gradually tighten the leg sleeve 10 towards the side plate 9, thereby fixing the leg.

[0024] In Embodiment 1, the middle column 4 and the fixed column 3 are both fixedly connected to the second rod 2. The first clamping rod 5 and the second clamping rod 7 are both rotatably connected to the middle column 4.

[0025] In Embodiment 2, the ends of the middle column 4 and the fixed column 3 both pass through the second rod 2. And a first nut 14 and a second nut 15 respectively used for pressing against both sides of the second rod 2 are threadedly connected to one end of the middle column 4 close to the second rod 2. And the first clamping rod 5 and the second clamping rod 7 are both sleeved on the middle column 4. In use, first rotate the first nut 14 towards the first rod 1, then move the second rod 2, the first clamping rod 5 and the second clamping rod 7 along the middle column 4 towards the first rod 1, and finally rotate the second nut 15 towards the second rod 2 until it presses against the second rod 2. In this way, the length between the first rod 1 and the second rod 2 can be adjusted, so that it can be used for smaller animals.

[0026] Furthermore, shaft rods 23 are rotatably connected to both the first rod 1 and the second rod 2. Synchronous wheels 22 are fixedly sleeved on the adjacent ends of the shaft rods 23 and the lead screws 12. The two synchronous wheels 22 in the same group are connected by a synchronous belt 24. In use, when one of the lead screws 12 is rotated in this way, the shaft rod 23 can be driven to rotate through the transmission cooperation of the synchronous wheels 22 and the synchronous belt 24, and then the other lead screw 12 is driven to rotate through the shaft rod 23. In this way, the two front legs or hind legs of the animal can be fixed at the same time, making the operation of the tool more convenient.

[0027] Among them, the head fixing component includes a U-shaped headgear 17. A pair of round holes 16 for inserting the headgear 17 are provided at the top of the first rack bar 1. A grip 18 is fixed at the top end of the headgear 17, and the headgear 17 is connected with a positioning component; During use, place the head of the animal between the first rack bar 1 and the headgear 17, then lift the headgear 17 upward until the headgear 17 and the first rack bar 1 cooperate to fix the neck of the animal, thereby fixing its head. Finally, fix the headgear 17 at this position through the positioning component.

[0028] In Embodiment 3, the positioning component includes a pair of ear seats 19 fixed at the top of the first rack bar 1. A plug rod 20 is passed through between the two ear seats 19. Multiple groups of jacks 21 for the plug rod 20 to pass through are provided on the headgear 17 and are evenly distributed up and down; During use, after lifting the headgear 17 upward to a suitable position, insert the plug rod 20 between the two ear seats 19 and make the plug rod 20 insert into a corresponding jack 21, then the headgear 17 can be fixed at this position.

[0029] In Embodiment 4, the positioning component includes a U-shaped push rod 25 that forms a sliding connection with the first rack bar 1 and supports the bottom of the headgear 17. The push rod 25 is connected with a lifting structure; During use, lift the push rod 25 upward through the lifting structure, and then the push rod 25 will synchronously lift the headgear 17 upward, thereby finally fixing the headgear 17 at a suitable position.

[0030] Among them, the lifting structure includes a pair of bearing seats 26 fixed on the inner side surface of the push rod 25. A shaft column 27 is rotatably connected to the bearing seats 26. The top end of the shaft column 27 passes through the push rod 25 and is rotatably connected to the first rack bar 1. Conical gears 28 are fixedly sleeved on the adjacent ends of the shaft column 27 and the shaft rod 23. The two conical gears 28 in the same group are meshed and connected; During use, when the shaft rod 23 rotates, it will drive the shaft column 27 to rotate through the meshing transmission of the two conical gears 28, and then the shaft column 27 will lift the push rod 25 upward and fix it at a suitable position.

[0031] In Embodiment 5, the lifting structure includes a pair of ear blocks 29 fixed to the inner side of the push rod 25. A pull rope 30 is fixed to the top end of the ear block 29. The other end of the pull rope 30 passes through the push rod 25 and is fixed to the winding drum 32. Both winding drums 32 are fixedly sleeved on the shaft rod 23. A pair of hanging posts 31 for hanging the pull rope 30 are rotatably connected to the inner side of the first support rod 1. A guide sleeve 34 is fixed to one side of the first support rod 1. A stop rod 35 is inserted into the guide sleeve 34. A guide post 36 is inserted into the back surface of the stop rod 35. The bottom end of the guide post 36 is fixedly connected to the guide sleeve 34. A spring 37 is sleeved on the guide post 36. Both ends of the spring 37 are fixedly connected to the guide sleeve 34 and the stop rod 35 respectively. A ratchet wheel 33 is fixedly sleeved on the shaft rod 23. The bottom end of the stop rod 35 can be inserted into the tooth gap of the ratchet wheel 33; During use, when the shaft rod 23 rotates, it will synchronously drive the winding drum 32 to rotate. Then the winding drum 32 will gradually wind up the pull rope 30, and the push rod 25 can be lifted upward by the other end of the pull rope 30. And when the shaft rod 23 rotates forward, it will synchronously drive the ratchet wheel 33 to rotate. The teeth of the ratchet wheel 33 will push the stop rod 35 upward, so the forward rotation of the shaft rod 23 will not be affected. On the contrary, due to the restriction of the stop rod 35, the ratchet wheel 33 cannot rotate backward, so that the headgear 17 is fixed in a proper position. When it is necessary to rotate the shaft rod 23 backward, just lift the stop rod 35 upward and then rotate the shaft rod 23.

[0032] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes an equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A handheld positioning and clamping tool for livestock and veterinary diagnosis and examination, comprising a first rod (1) and a second rod (2) that are mirror-symmetrical, characterized in that, The first support rod (1) and the second support rod (2) are connected by an intermediate column (4) and a pair of fixed columns (3). The pair of fixed columns (3) are symmetrically distributed on both sides of the intermediate column (4). A pair of first clamping rods (5) and second clamping rods (7) capable of rotating around the intermediate column (4) are arranged on the intermediate column (4). The tops of the two first clamping rods (5) are jointly fixed with a first handle (6), and the tops of the two second clamping rods (7) are jointly fixed with a second handle (8). Side plates (9) are provided on the opposite surfaces of the first support rod (1) and the second support rod (2), and a leg fixing assembly is arranged on the side plates (9). A head fixing assembly is arranged at the top of the first support rod (1); The leg fixing assembly is used for fixing the legs of an animal; The head fixing assembly is used for fixing the head of an animal.

2. The handheld positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 1, characterized in that, The leg fixing assembly includes a U-shaped leg sleeve (10) passing through the side plate (9). Connecting plates (11) are jointly fixed at both ends of the leg sleeve (10). A lead screw (12) threadedly connected to the connecting plate (11) is rotatably connected to the outside of the side plate (9). A turning handle (13) is fixed at the end of the lead screw (12).

3. A handheld positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 1, characterized in that, Both the intermediate column (4) and the fixed column (3) are fixedly connected to the second support rod (2). Both the first clamping rod (5) and the second clamping rod (7) are rotatably connected to the intermediate column (4).

4. A handheld positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 1, characterized in that The ends of the intermediate column (4) and the fixed column (3) both pass through the second support rod (2). And a first nut (14) and a second nut (15) for respectively pressing against both sides of the second support rod (2) are threadedly connected to one end of the intermediate column (4) close to the second support rod (2). And both the first clamping rod (5) and the second clamping rod (7) are sleeved on the intermediate column (4).

5. The handheld positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 2, characterized in that, Shaft rods (23) are rotatably connected to both the first support rod (1) and the second support rod (2). Synchronous wheels (22) are fixedly sleeved on the adjacent ends of the shaft rod (23) and the lead screw (12). The two synchronous wheels (22) in the same group are connected by a synchronous belt (24).

6. The handheld positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 5, characterized in that, The head fixing assembly includes a U-shaped head sleeve (17). A pair of circular holes (16) for inserting the head sleeve (17) are opened at the top of the first support rod (1). A grip (18) is fixed at the top of the head sleeve (17). The head sleeve (17) is connected with a positioning assembly.

7. A handheld positioning and clamping tool for livestock and veterinary diagnostic examinations according to claim 6, characterized in that, The positioning assembly includes a pair of ear seats (19) fixed at the top of the first support rod (1). A plug rod (20) is passed through between the two ear seats (19). Multiple groups of jacks (21) for the plug rod (20) to pass through and evenly distributed up and down are opened on the head sleeve (17).

8. A handheld positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 6, characterized in that, The positioning assembly includes a U-shaped push rod (25) that forms a sliding connection with the first support rod (1) and supports the bottom of the head sleeve (17). The push rod (25) is connected with a lifting structure.

9. A hand-held positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 8, characterized in that, The lifting structure includes a pair of bearing seats (26) fixed on the inner side surfaces of the push rod (25). A shaft column (27) is rotatably connected to the bearing seats (26). The top of the shaft column (27) passes through the push rod (25) and is rotatably connected to the first support rod (1). Synchronous bevel gears (28) are fixedly sleeved on the adjacent ends of the shaft column (27) and the shaft rod (23). The two synchronous bevel gears (28) in the same group are meshed and connected.

10. A handheld positioning and clamping tool for livestock and veterinary diagnosis and examination according to claim 8, characterized in that, The lifting structure includes a pair of ear blocks (29) fixed to the inner side of the push rod (25). A pull rope (30) is fixed to the top end of the ear block (29). The other end of the pull rope (30) passes through the push rod (25) and is fixed to the reel (32). Both reels (32) are fixedly sleeved on the shaft rod (23). A pair of hanging posts (31) for hanging the pull rope (30) are rotatably connected to the inner side of the first frame rod (1). A guide sleeve (34) is fixed to one side of the first frame rod (1). A stop rod (35) is inserted into the guide sleeve (34). A guide post (36) is inserted into the back surface of the stop rod (35). The bottom end of the guide post (36) is fixedly connected to the guide sleeve (34). A spring (37) is sleeved on the guide post (36). Both ends of the spring (37) are fixedly connected to the guide sleeve (34) and the stop rod (35) respectively. A ratchet wheel (33) is fixedly sleeved on the shaft rod (23). The bottom end of the stop rod (35) can be inserted into the tooth gap of the ratchet wheel (33).

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