Head lifting device for cattle treatment

Abstract

The utility model relates to a head lifting device for cattle treatment, which comprises a limiting part, a channel for cattle to walk and pass through is formed in the limiting part, a supporting part is transversely arranged in one port of the channel, the supporting part is fixedly arranged on the limiting part, two clamping jaws are arranged at the bottom of the supporting part, and the clamping jaws are fixedly arranged on the limiting part. The two clamping jaws are symmetrically arranged about the center line of the channel and can slide along the supporting part; a one-way locking part is arranged between the two clamping jaws and the supporting part and used for limiting back-to-back sliding of the two clamping jaws. The problems that in the prior art, the cow head is difficult to lift and clamp stably due to small human strength, the risk that the cow head struggles away from constraint exists, and cow examination or treatment is difficult to conduct smoothly are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of animal husbandry, and in particular to a head lifting device used for treating cattle. Background Art

[0002] In animal husbandry, especially cattle breeding, regular physical examinations or treatments are required. This involves inspecting the mouth, teeth, and eyes to determine if there are any pathological conditions in these areas. This helps determine if the cattle are growing healthily. During the inspection process, these areas are often stimulated, so it is particularly important to support and secure the cattle's head to ensure smooth inspection or treatment.

[0003] In some existing cattle farms, multiple people use their hands or handheld instruments to hold and support the cow's head to prevent it from swinging wildly. However, due to the large size, height, and strength of cattle, it is difficult for humans to stably hold and support the head. This poses a risk of the head breaking free, making it difficult to conduct inspections or treatments. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a head lifting device for treating cattle, so as to solve the problem in the prior art that people have limited strength and cannot stably lift and clamp the cattle's head, and there is a risk of the cattle's head breaking free from the restraints, making it difficult to smoothly examine or treat the cattle.

[0005] The utility model is achieved through the following technical solutions:

[0006] A head-lifting device for treating cattle includes a limiting portion, wherein a passage for the cattle to walk through is formed in the limiting portion, a support portion is transversely arranged at one end of the passage, the support portion is fixedly mounted on the limiting portion, and two clamping claws are provided at the bottom of the support portion, the two clamping claws are symmetrically arranged about the center line of the passage, and both can slide along the support portion;

[0007] A one-way locking portion is provided between the two clamping jaws and the supporting portion, and the one-way locking portion is used to limit the two clamping jaws from sliding in opposite directions.

[0008] Furthermore, the support portion includes a crossbar perpendicular to the side walls of the channel, and both ends of the crossbar are fixedly connected to the top ends of the two side walls of the channel respectively;

[0009] A mounting block is connected to the lower middle portion of the crossbar, wherein a gear and two racks meshing with the gear are provided in the mounting block, wherein the gear and the mounting block rotate in conjunction with each other around the gear axis, and the plane of the rotation trajectory is perpendicular to the center line of the channel;

[0010] The two racks are parallel and arranged on the upper and lower sides of the gear. The two opposite ends of the two racks respectively penetrate the two side walls of the mounting block and extend out of the mounting block and slide in conjunction, and are respectively fixedly connected to the top ends of the two clamping jaws.

[0011] Furthermore, arc-shaped grooves are provided on the two facing sides of the bottom ends of the two clamping jaws, the axis of the arc-shaped groove is parallel to the center line of the channel, and the central angle of the arc-shaped groove is less than 180 degrees.

[0012] Furthermore, a first torsion spring is provided between the gear and the mounting block, one end of the first torsion spring is fixedly connected to the gear and the other end is fixedly connected to the mounting block, and when the first torsion spring is in a naturally extended state, both ends of the two racks are opposite to each other and extend out of the mounting block.

[0013] Furthermore, the one-way locking portion includes a ratchet and a pawl provided on the side of the mounting block facing away from the limiting portion, and one end of the gear facing away from the limiting portion passes through the side wall of the mounting block and is coaxially fixedly connected to the ratchet;

[0014] One end of the pawl is rotatably connected to the outer wall of the mounting block, and the plane of the rotation track is parallel to the center line of the channel, and the other end of the pawl is inserted into the tooth groove of the ratchet;

[0015] A second torsion spring is provided between the pawl and the mounting block, and the axis of the second torsion spring is colinear with the rotation center line of the pawl. One end of the second torsion spring is fixedly connected to the pawl and the other end is fixedly connected to the mounting block. When the second torsion spring is in a naturally extended state, the pawl is inserted into the tooth groove of the ratchet and abuts against the ratchet.

[0016] Furthermore, a lever is provided at one end of the pawl connected to the mounting block, one end of the lever is fixedly connected to the pawl and the other end extends toward the side away from the ratchet, and the length of the pawl is smaller than the length of the lever.

[0017] Furthermore, the mounting block is provided with a vertical rod with one end open in a U shape, the end of the vertical rod facing away from the opening is fixedly connected to the mounting block, the open end passes through the cross rod and slides along the vertical direction;

[0018] A screw rod in a vertical state is provided in the vertical rod. The bottom end of the screw rod is rotatably matched with the bottom wall of the vertical rod, and the top end of the screw rod passes through the horizontal rod and is connected by threaded fit.

[0019] Furthermore, the open end of the vertical rod is fixedly connected to a connecting block, and the connecting block and the vertical rod are spliced together to form a closed-loop rectangular frame structure;

[0020] The top end of the screw rod is inserted into the connecting block and rotated to fit.

[0021] Furthermore, a turntable is coaxially fixedly connected to the bottom end of the screw rod, and the outer circular edge of the turntable protrudes from the opening of the side wall of the vertical rod.

[0022] The beneficial effects of the present invention are:

[0023] This head-lifting device for treating cattle uses a limiting portion to preliminarily position the cattle's trunk to restrict the cattle's free movement; two clamping jaws are provided at the bottom end of the support portion, and the two clamping jaws slide along the support portion. By driving the two clamping jaws closer together, the cattle's neck is lifted and clamped, thereby restricting the cattle's head from swinging significantly, so as to facilitate inspection of the cattle's mouth, teeth, eyes and other parts; a one-way locking portion is provided to restrict the two clamping jaws from sliding back to back, so that when the two clamping jaws clamp the cattle's neck, the opening size between the two clamping jaws remains stable, thereby stably lifting and clamping the cattle's neck.

[0024] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of the support portion and the one-way locking portion in an embodiment of the present utility model;

[0027] Figure 3 An exploded view of the support portion and the one-way locking portion in an embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of the clamping jaw in the embodiment of the present utility model;

[0029] Figure 5 for Figure 3 Enlarged view of point A in the middle;

[0030] Figure 6 for Figure 3 Enlarged view of point B in the middle.

[0031] In the figure: fence 111, horizontal plate 112, clamping claw 12, arc groove 121, mounting block 13, connecting rod 131;

[0032] Gear 21, rack 22, first torsion spring 23;

[0033] Ratchet 31, pawl 32, second torsion spring 33, and shift lever 34;

[0034] Horizontal rod 41 , vertical rod 42 , screw rod 43 , connecting block 44 , turntable 45 . DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the above description of the present invention, it should be noted that the terms "one side" and "the other side" and the like indicate positions or locations based on the positions or locations shown in the accompanying drawings, or the positions or locations in which the product of the present invention is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0039] Furthermore, the term "identical" and similar terms do not necessarily require that the components be absolutely identical; slight variations are permitted. The term "perpendicular" simply refers to the positional relationship between components being more perpendicular than "parallel," not that the structure must be perfectly vertical; rather, it can be slightly tilted.

[0040] See also Figure 1-6 The utility model provides a technical solution: a head lifting device for treating cattle, comprising a limiting portion, wherein a passage for cattle to walk through is formed in the limiting portion, a support portion is transversely arranged in one end of the passage, the support portion is fixedly mounted on the limiting portion, and two clamping jaws 12 are arranged at the bottom of the support portion, the two clamping jaws 12 are symmetrically arranged about the center line of the passage, and both can slide along the support portion;

[0041] A one-way locking portion is provided between the two clamping jaws 12 and the supporting portion, and the one-way locking portion is used to limit the two clamping jaws 12 from sliding in opposite directions.

[0042] The limiting part consists of two fences 111 and a horizontal plate 112. The two fences 111 are respectively located on two parallel vertical planes. The horizontal plate 112 is located on a horizontal plane and its two side edges are fixedly connected to the bottom edges of the two fences 111 respectively. The distance between the two fences 111 is adapted to the external dimensions of the cattle trunk. The two fences 111 and the horizontal plate 112 are spliced together to form a rectangular frame structure with a top wall opening and openings on the opposite side walls.

[0043] During use, the bottom of the limiting part is fixed to the ground in advance by locking expansion screws or pouring cement, and relevant technicians manually pull or drive the cattle to be tested or treated to walk, so that the cattle enters the limiting part from the opening on the side of the passage facing away from the clamping jaws 12, preliminarily locate the cattle's trunk, and drive the cattle to walk until the cattle's neck is close to the two clamping jaws 12, and the cattle's free movement is restricted by the two fences 111; by driving the two clamping jaws 12 to slide synchronously in opposite directions and approach each other, the two clamping jaws 12 are close to the cattle's neck until the cattle's neck is clamped and lifted, thereby restricting the cattle's head from swinging significantly, so as to facilitate inspection of the cattle's mouth, teeth, eyes and other parts; the two clamping jaws 12 are restricted from sliding backwards by the one-way locking part, so that when the two clamping jaws 12 clamp the cattle's neck, the opening size between the two clamping jaws 12 remains stable, thereby stably lifting and clamping the cattle's neck.

[0044] In this embodiment, the support portion includes a crossbar 41 perpendicular to the side wall of the channel, and both ends of the crossbar 41 are fixedly connected to the top of the two side walls of the channel respectively;

[0045] The lower middle portion of the crossbar 41 is connected to a mounting block 13, wherein a gear 21 and two racks 22 respectively meshing with the gear 21 are provided in the mounting block 13. The gear 21 and the mounting block 13 rotate around the axis of the gear 21, and the plane of the rotation trajectory is perpendicular to the center line of the channel.

[0046] The two racks 22 are parallel and arranged on the upper and lower sides of the gear 21. The opposite ends of the two racks 22 pass through the two side walls of the mounting block 13 and extend out of the mounting block 13 and slide in conjunction with each other, and are fixedly connected to the top ends of the two clamping jaws 12 respectively.

[0047] During use, when it is necessary to clamp and lift the cow's neck, the gear 21 is rotated forward, and the gear 21 drives the two clamping jaws 12 to move toward each other synchronously through the two racks 22, so that the two clamping jaws 12 are close to each other until they are in contact with the cow's neck, thereby clamping and lifting the cow's neck.

[0048] In this embodiment, arcuate grooves 121 are formed on the two facing sides of the bottom ends of the two clamping jaws 12. The axis of the arcuate groove 121 is parallel to the center line of the channel, and the central angle of the arcuate groove 121 is less than 180 degrees.

[0049] By providing an arc-shaped groove 121 on the clamping jaws 12, when the cow's neck is clamped, the cow's neck is embedded in the arc-shaped groove 121, so that the cow's neck fits into the surface of the arc-shaped grooves 121 on the two clamping jaws 12, thereby improving the comfort of the cow when being clamped; at the same time, the cow's neck can be hung on the arc-shaped groove 121 to achieve the purpose of supporting the cow's head.

[0050] The diameter of the cow's neck is smaller than the diameter of the arc-shaped groove 121. When the two jaws 12 are gathered together and pressed against each other, the two arc-shaped grooves 121 on the two jaws 12 are spliced to form a through hole. By setting the central angle of the arc-shaped groove 121 to less than 180 degrees, the horizontal distance of the through hole is smaller than the vertical distance, so that the two jaws 12 can be adjusted in a wider range on the mounting block 13, and thus cows with a wider range of neck diameters can be clamped and lifted by the two jaws 12.

[0051] In this embodiment, a first torsion spring 23 is provided between the gear 21 and the mounting block 13. One end of the first torsion spring 23 is fixedly connected to the gear 21, and the other end is fixedly connected to the mounting block 13. When the first torsion spring 23 is in a naturally extended state, the two racks 22 extend out of the mounting block 13 at opposite ends.

[0052] Two first torsion springs 23 are provided, one mounted on each end of the gear 21. When the one-way locking mechanism is not restraining the two jaws 12 from moving away from each other, the first torsion springs 23 extend freely, pushing the gear 21 in the opposite direction. This causes the two racks 22 to push the two jaws 12 away from each other, thereby opening and widening the openings at the bottom ends of the two jaws 12 to facilitate the cow's neck to enter and exit the gap formed by the two arc-shaped grooves 121.

[0053] In this embodiment, the one-way locking portion includes a ratchet 31 and a pawl 32 provided on the side of the mounting block 13 facing away from the limiting portion. The end of the gear 21 facing away from the limiting portion passes through the side wall of the mounting block 13 and is coaxially fixedly connected to the ratchet 31.

[0054] One end of the pawl 32 is rotatably connected to the outer wall of the mounting block 13, and the plane of the rotation trajectory is parallel to the center line of the channel, and the other end of the pawl 32 is inserted into the tooth groove of the ratchet wheel 31;

[0055] A second torsion spring 33 is provided between the pawl 32 and the mounting block 13, and the axis of the second torsion spring 33 is collinear with the rotation center line of the pawl 32. One end of the second torsion spring 33 is fixedly connected to the pawl 32, and the other end is fixedly connected to the mounting block 13. When the second torsion spring 33 is in a naturally extended state, the pawl 32 is inserted into the tooth groove of the ratchet 31 and abuts against the ratchet 31.

[0056] A connecting rod 131 is provided on the outer wall of the mounting block 13, facing away from the stopper. One end of the connecting rod 131 is fixedly connected to the mounting block 13. The other end extends perpendicular to the outer wall of the mounting block 13, passes through the end of the pawl 32 facing away from the ratchet 31, and rotates therewith. A second torsion spring 33 is sleeved around the outside of the connecting rod 131.

[0057] During use, when it is necessary to clamp the cow's neck, the two jaws 12 are manually pushed closer to each other, and the two jaws 12 push the gear 21 to rotate forward through the two racks 22. The second torsion spring 33 deforms and stores energy. At the same time, the ratchet 31 rotates forward, and the teeth of the ratchet 31 push the pawl 32 to rotate forward on the connecting rod 131. The second torsion spring 33 deforms and stores energy. After the teeth of the ratchet 31 slide smoothly over the pawl 32, the second torsion spring 33 releases energy to push the pawl 32 to rotate in the opposite direction and insert it into the tooth groove of the ratchet 31 again. Similarly, the ratchet 31 can continue to rotate forward smoothly until the two jaws 12 are in contact with the cow's neck. The external force applied to the two clamping jaws 12 is eliminated, and the first torsion spring 23 releases energy, applying a reverse torsional force to the gear 21. The gear 21 transmits the reverse torsional force to the ratchet 31, causing the ratchet 31 to resist the pawl 32. Under the interference of the pawl 32, the reverse rotation of the ratchet 31 and the gear 21 is restricted, so that the two clamping jaws 12 can stably clamp and lift the cow's neck.

[0058] In this embodiment, a lever 34 is further provided at one end of the pawl 32 connected to the mounting block 13. One end of the lever 34 is fixedly connected to the pawl 32 and the other end extends toward the side away from the ratchet 31. The length dimension of the pawl 32 is smaller than the length dimension of the lever 34.

[0059] The pawl 32 and the handle form a lever structure, and the lever 34 serves as the force-saving end. To remove the pawl 32 from blocking the ratchet wheel 31, simply apply a forward rotational force to the lever 34, causing the pawl 32 to slide out of the tooth groove of the ratchet wheel 31, thereby removing the pawl 32 from blocking the ratchet wheel 31. After the pawl 32 removes the blocking effect on the ratchet wheel 31, the first spring releases its energy and expands freely, pushing the gear 21 to rotate in the opposite direction. Under the action of the two racks 22, the two jaws 12 move away from each other, opening or widening the opening at the bottom ends of the two jaws 12.

[0060] In this embodiment, the mounting block 13 is provided with a U-shaped vertical rod 42 with one end open. The end of the vertical rod 42 facing away from the opening is fixedly connected to the mounting block 13, and the open end passes through the cross rod 41 and slides along the vertical direction.

[0061] A vertical screw rod 43 is provided in the vertical rod 42 . The bottom end of the screw rod 43 is rotatably engaged with the bottom wall of the vertical rod 42 , and the top end of the screw rod 43 passes through the horizontal rod 41 and is connected by a thread.

[0062] The vertical rod 42 is provided to support and fix the mounting block 13 , and the mounting block 13 and the two clamping jaws 12 are suspended in the air by the vertical rod 42 .

[0063] During use, when the horizontal height of the mounting block 13 and the two clamping jaws 12 needs to be adjusted, the screw rod 43 is rotated forward to rotate the screw rod 43 on the vertical rod 42. At the same time, the screw rod 43 is pushed vertically upward by the horizontal rod 41, and then the screw rod 43 drives the vertical rod 42 to slide vertically upward on the horizontal rod 41, thereby raising the horizontal height of the mounting block 13 and the two clamping jaws 12.

[0064] In this embodiment, the open end of the vertical rod 42 is fixedly connected to a connecting block 44, and the connecting block 44 and the vertical rod 42 are spliced together to form a closed-loop rectangular frame structure;

[0065] The top end of the screw rod 43 is inserted into the connecting block 44 and rotated to fit.

[0066] The connecting block 44 and the vertical rod 42 are spliced into a closed rectangular frame structure to improve the structural strength of the vertical rod 42. At the same time, the two ends of the screw rod 43 are rotated together with the bottom wall of the vertical rod 42 and the connecting block 44 respectively, so that the rotation of the screw rod 43 on the vertical rod 42 is smoother.

[0067] In this embodiment, the bottom end of the screw rod 43 is coaxially fixedly connected to a turntable 45 , and the outer circular edge of the turntable 45 protrudes from the opening of the side wall of the vertical rod 42 .

[0068] By setting a turntable 45 at the bottom end of the screw rod 43, the outer cylindrical surface of the turntable 45 is processed with anti-slip grooves to improve the roughness of the outer cylindrical surface of the turntable 45, so as to facilitate the relevant technical personnel to operate and control the rotation of the turntable 45; at the same time, the turntable 45 is set at a position close to the bull head, which provides convenience for the operation of the relevant technical personnel.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A head lifting device for cattle treatment, characterized by: The invention comprises a limiting portion, wherein a passage for cattle to walk through is formed in the limiting portion, a support portion is transversely arranged in one end of the passage, the support portion is fixedly mounted on the limiting portion, and two clamping claws (12) are arranged at the bottom of the support portion, the two clamping claws (12) are symmetrically arranged about the center line of the passage, and both can slide along the support portion; A one-way locking portion is provided between the two clamping jaws (12) and the supporting portion, and the one-way locking portion is used to limit the two clamping jaws (12) from sliding in opposite directions.

2. The head lifting device for cattle treatment according to claim 1, characterized in that: The support portion includes a crossbar (41) perpendicular to the side walls of the channel, and both ends of the crossbar (41) are fixedly connected to the top ends of the two side walls of the channel respectively; A mounting block (13) is connected to the lower middle portion of the crossbar (41), wherein a gear (21) and two racks (22) respectively meshing with the gear (21) are provided in the mounting block (13), wherein the gear (21) and the mounting block (13) rotate in conjunction with each other around the axis of the gear (21), and the plane of the rotation trajectory is perpendicular to the center line of the channel; The two racks (22) are parallel and arranged on the upper and lower sides of the gear (21). The two opposite ends of the two racks (22) respectively penetrate the two side walls of the mounting block (13) and extend out of the mounting block (13) and slide in conjunction with each other, and are respectively fixedly connected to the top ends of the two clamping jaws (12).

3. The head lifting device for cattle treatment according to claim 1, characterized in that: Arc grooves (121) are provided on the two facing sides of the bottom ends of the two clamping jaws (12), the axis of the arc groove (121) is parallel to the center line of the channel, and the central angle of the arc groove (121) is less than 180 degrees.

4. The head lifting device for cattle treatment according to claim 2, characterized in that: A first torsion spring (23) is provided between the gear (21) and the mounting block (13), one end of the first torsion spring (23) being fixedly connected to the gear (21) and the other end being fixedly connected to the mounting block (13), and when the first torsion spring (23) is in a naturally extended state, both ends of the two racks (22) are opposite to each other and extend outside the mounting block (13).

5. The head lifting device for cattle treatment according to claim 2, characterized in that: The one-way locking portion comprises a ratchet (31) and a pawl (32) provided on a side of the mounting block (13) facing away from the limiting portion, and one end of the gear (21) facing away from the limiting portion passes through a side wall of the mounting block (13) and is coaxially fixedly connected to the ratchet (31); One end of the pawl (32) is rotatably connected to the outer wall of the mounting block (13), and the plane of the rotation track is parallel to the center line of the channel, and the other end of the pawl (32) is inserted into the tooth groove of the ratchet (31); A second torsion spring (33) is provided between the pawl (32) and the mounting block (13), and the axis of the second torsion spring (33) is colinear with the rotation center line of the pawl (32). One end of the second torsion spring (33) is fixedly connected to the pawl (32), and the other end is fixedly connected to the mounting block (13). When the second torsion spring (33) is in a naturally extended state, the pawl (32) is inserted into the tooth groove of the ratchet (31) and abuts against the ratchet (31).

6. The head lifting device for cattle treatment according to claim 5, characterized in that: One end of the pawl (32) connected to the mounting block (13) is further provided with a shifting rod (34), one end of the shifting rod (34) is fixedly connected to the pawl (32), and the other end extends toward a side facing away from the ratchet (31), and the length dimension value of the pawl (32) is smaller than the length dimension value of the shifting rod (34).

7. The head lifting device for cattle treatment according to claim 2, characterized in that: The mounting block (13) is provided with a vertical rod (42) with one end open in a U shape, the end of the vertical rod (42) facing away from the opening is fixedly connected to the mounting block (13), and the open end passes through the cross rod (41) and is slidably engaged in the vertical direction; A screw rod (43) in a vertical state is provided in the vertical rod (42). The bottom end of the screw rod (43) is rotatably matched with the bottom wall of the vertical rod (42), and the top end passes through the horizontal rod (41) and is connected by threaded matching.

8. The head lifting device for cattle treatment according to claim 7, characterized in that: The open end of the vertical rod (42) is fixedly connected to a connecting block (44), and the connecting block (44) and the vertical rod (42) are spliced together to form a closed-loop rectangular frame structure; The top end of the screw rod (43) is inserted into the connecting block (44) and rotated to fit.

9. The head lifting device for cattle treatment according to claim 7, characterized in that: The bottom end of the screw rod (43) is coaxially fixedly connected to a turntable (45), and the outer circular edge of the turntable (45) protrudes from the opening of the side wall of the vertical rod (42).

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