Ear tag pliers for livestock

Abstract

The application discloses a livestock ear tag clamp and relates to the technical field of livestock instruments, which comprises a main handle, a rotating wheel rotatably connected to the main handle, a torsional spring arranged at the rotatable connection between the rotating wheel and the main handle, a knob fixedly connected to the rotating wheel, an incomplete gear fixedly connected to the middle part of the rotating wheel, an L-shaped gear rack meshed with one side of the incomplete gear, a pressing rod fixedly connected to the lower end of the L-shaped gear rack, a limiting ring fixedly connected to the main handle, the pressing rod being slidably connected to the limiting ring, and a pressing needle fixedly connected to the bottom end of the pressing rod after penetrating out of the limiting ring. The operation of automatically marking by resetting the torsional spring greatly reduces the burden of directly using hands to force every time of marking. Compared with the traditional ear tag clamp which relies on manual application of large force to mark one by one, the application is more labor-saving, can complete more marking times in the same time, significantly improves the working efficiency of installing ear tags for livestock, and is suitable for application in the scene of quickly wearing ear tags for animals in large-scale farms.

Description

Technical Field

[0001] This invention relates to the field of livestock equipment technology, specifically to a livestock ear tag clamp. Background Technology

[0002] Livestock ear tag pliers are commonly used instruments and equipment in animal husbandry. They are mainly used to tag livestock such as pigs, cattle, and sheep for identification and management. Traditional ear tag pliers usually use the lever principle to amplify the force applied by the user, so that the ear tag can be easily inserted through the animal's ear and fixed in the appropriate position.

[0003] However, although existing livestock ear tagging pliers can amplify the applied force, they still require considerable force. When a large number of livestock need to be ear-tagged, prolonged manual pressure can easily cause muscle fatigue in the operator's hands. This is especially true in large-scale farms with a large number of animals. After a day, workers often experience arm pain, which not only causes discomfort but also affects subsequent work efficiency and operational accuracy. Furthermore, as operators become fatigued, the stability of their hand force decreases, which may result in insufficient pressure to pierce the ear tag, leading to tagging failure and injury to the livestock's ears.

[0004] Therefore, in view of this, the present invention provides a livestock ear tag clamp. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a livestock ear tag clamp to solve the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A livestock ear tag pliers includes a main handle, a rotating wheel rotatably connected to the main handle, a torsion spring provided at the rotatable connection between the rotating wheel and the main handle, a knob fixedly connected to the rotating wheel, an incomplete gear fixedly connected to the middle of the rotating wheel, an L-shaped rack meshing on one side of the incomplete gear, a pressure rod fixedly connected to the lower end of the L-shaped rack, a limit ring fixedly connected to the main handle, the pressure rod slidably connected within the limit ring, and a pressure needle fixedly connected to the bottom end of the pressure rod after it passes through the limit ring.

[0008] An automatic marking assembly is provided on the main handle. The automatic marking assembly includes slide rods symmetrically fixedly connected to the main handle. A push plate is slidably connected to the slide rod. A spring is sleeved on each slide rod. A movable handle is rotatably connected inside the main handle. A circular plate is fixedly connected to the pivot of the movable handle. A push rod is rotatably connected to the circular plate. The upper end of the push rod is rotatably connected to the push plate. An arc-shaped locking plate is fixedly connected to the push plate. A limit protrusion is provided on the side of the arc-shaped locking plate near the rotating wheel. A locking slot is provided on the rotating wheel.

[0009] Preferably, the outer surface of the pressing rod is sleeved with a spring one, one end of the spring one is fixedly connected with the limiting ring, and the other end of the spring one is fixedly connected with the L-shaped rack.

[0010] Preferably, one end of the spring two is fixedly connected with the sliding rod, and the other end is fixedly connected with the upper surface of the push plate.

[0011] Preferably, the spring three is fixedly connected between the main handle and the movable handle.

[0012] Preferably, the main handle is provided with a centering assembly for assisting the ear tag pin to be centered at one end close to the pressing needle, the centering assembly comprises a clamping plate rotatably connected to the main handle, and a torsional spring is connected to the rotation connection position of the clamping plate and the main handle.

[0013] Preferably, a U-shaped opening is formed at one end of the main handle close to the clamping plate, a U-shaped slot is formed on the clamping plate, two limiting rods are symmetrically and slidably connected to the U-shaped opening of the main handle, one end of each of the two limiting rods penetrating into the inner side of the U-shaped opening of the main handle is fixedly connected with a limiting plate, one end of each of the two limiting rods penetrating out of the outer wall of the main handle is sleeved with a spring four, one end of the spring four is fixedly connected with the outer surface of the limiting rod, and the other end of the spring four is fixedly connected with the outer surface of the main handle.

[0014] Preferably, a semicircular hole is formed in the middle of one side of each of the two limiting plates close to each other.

[0015] Preferably, the two limiting plates are made of rubber.

[0016] Preferably, the pressing needle is threadedly connected with the pressing rod, the pressing needle comprises a cylindrical head and a needle head fixedly connected to the cylindrical head, the outer surface of the cylindrical head is provided with external threads, the bottom end of the pressing rod is provided with a counterbore, and the counterbore is provided with internal threads matched with the external threads of the pressing needle.

[0017] The livestock ear tag clamp provided by the application has the following beneficial effects:

[0018] The design of automatic marking by the torsional spring reset greatly reduces the burden of direct hand force during each marking, compared with the traditional ear tag clamp which relies on manual application of large force for marking, and is more labor-saving, so that more marking times can be completed in the same time, the work efficiency of wearing ear tags for livestock is significantly improved, the ear tag clamp is suitable for application in the scene of rapid wearing of animal ear tags in large-scale farms, and the force of the pressing needle piercing the ear tag pin can be maintained, so that marking failure is avoided, and the situation that the ear of the livestock is injured is avoided.

[0019] By setting the semicircular hole on the limiting plate, the sub-mark b can be effectively stabilized in the centered position, the centered position can guarantee that the ear-mark nail and the pressing needle are accurately aligned, so that the animal ear can be punctured along the expected path, unnecessary tissue pulling of the animal is reduced, the situation that the sub-mark b and the main mark nail a are misaligned to produce skew so as to fail to mark is avoided, the accuracy of marking completion is ensured, and the efficiency of marking is improved.

[0020] By adopting the threaded connection mode of the pressing needle and the pressing rod, the pressing needle for marking can be easily disassembled, cleaned in an overall and detailed manner, and replaced with a new one, so that subsequent ear-mark wearing work can be normally and efficiently carried out, and the replacement operation is simple and does not require complex tools or professional maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the application;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the application; Figure 1

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the application;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the application; Figure 3

[0025] It is a schematic diagram of the three-dimensional structure of the application; Figure 5

[0026] It is a schematic diagram of the three-dimensional structure of the application; Figure 6

[0027] It is a schematic diagram of the three-dimensional structure of the application; Figure 7

[0028] It is a schematic diagram of the three-dimensional structure of the application; Figure 8 Figure 7

[0029] Figure 9 It is a schematic diagram of the three-dimensional structure of the application.

[0030] In the figure:

[0031] 1, ear-mark nail; 101, main handle; 102, rotating wheel; 103, incomplete gear; 104, knob; 105, L-shaped rack; 106, pressing rod; 107, limiting ring; 108, pressing needle; 109, spring I;

[0032] ​​​201, slide bar; 202, limiting convex rod; 203, push plate; 204, spring two; 205, push rod; 206, round plate; 207, dynamic handle; 208, spring three; 209, bayonet; 210, arc-shaped clamping plate;

[0033] 301, clamping plate; 302, limiting rod; 303, spring four; 304, limiting plate. DETAILED DESCRIPTION

[0034] Embodiments of the application:

[0035] Please refer to Figures 1 to 9 The utility model provides a kind of livestock ear tag pliers, including main handle 101, rotationally connected with rotating wheel 102 on main handle 101 by rotating shaft, and the both ends of rotating wheel 102 are provided with torsion spring at the rotation connection of main handle 101, and torsion spring is sleeved on the rotating shaft of rotating wheel 102, one end of torsion spring is fixedly connected with rotating wheel 102, and the other end of torsion spring is fixedly connected with main handle 101. The end of rotating shaft of rotating wheel 102 is fixedly connected with knob 104, rotating wheel 102 is fixedly connected with incomplete gear 103 in middle part, one side of incomplete gear 103 is engaged with L-shaped rack 105, L-shaped rack 105 is fixedly connected with pressing rod 106 at lower end, limiting ring 107 is fixedly connected on main handle 101, limiting ring 107 is below L-shaped rack 105, and pressing rod 106 is slidably connected in limiting ring 107. The end of pressing rod 106 that passes through the lower surface of limiting ring 107 is fixedly connected with pressure needle 108, specifically, pressure needle 108 includes cylindrical head and needle head fixedly connected on cylindrical head, outer thread is arranged on the outer surface of cylindrical head, the bottom end of pressing rod 106 is provided with counterbore, and the diameter of counterbore is equal to that of cylindrical head, inner thread that is matched with the outer thread of pressure needle 108 is arranged in counterbore, and cylindrical head of pressure needle 108 is rotated and screwed into counterbore of pressing rod 106, so that pressure needle 108 can be fixedly installed on pressing rod 106.

[0036] Automatic marking assembly is arranged on main handle 101, and the automatic marking assembly includes two slide bars 201 fixedly connected on main handle 101, push plate 203 is slidably connected on two slide bars 201, spring two 204 is sleeved on two slide bars 201, two spring two 204 are arranged, one end of two spring two 204 is fixedly connected with adjacent slide bar 201 respectively, and the other end of two spring two 204 is fixedly connected with the upper surface of push plate 203. Dynamic handle 207 is rotatably connected in main handle 101 through rotating shaft, round plate 206 is fixedly connected on the rotating shaft of dynamic handle 207, push rod 205 is rotatably connected on the eccentric position of round plate 206, the upper end of push rod 205 is rotatably connected with push plate 203, and arc-shaped clamping plate 210 is fixedly connected on push plate 203.

[0037] The rotating wheel 102 is provided with an arrow indicating the rotating direction, which can remind the user of the rotating direction. The incomplete gear 103 is provided with teeth only in a small half circle, and the vertical part of the L-shaped rack 105 is provided with teeth, and the horizontal part of the L-shaped rack 105 is not provided with teeth.

[0038] Please refer to Figures 1 to 7 and Figure 9 The outer surface of the pressing rod 106 is sleeved with a spring 109, one end of the spring 109 is fixedly connected with the limiting ring 107, and the other end of the spring 109 is fixedly connected with the horizontal part of the L-shaped rack 105. The arc-shaped clamping plate 210 is provided with a limiting protruding rod 202 close to one side of the rotating wheel 102, and the rotating wheel 102 is provided with a clamping opening 209, and the limiting protruding rod 202 can be inserted into the clamping opening 209. The spring 208 is fixedly connected between the main handle 101 and the movable handle 207, one end of the spring 208 is fixedly connected with the main handle 101, and the other end of the spring 208 is fixedly connected with the movable handle 207.

[0039] Please refer to Figure 1 、 Figure 3 and Figure 8 、 Figure 9 The ear tag nail 1 is placed on the main handle 101, and the main handle 101 is provided with a centering assembly for assisting the ear tag nail 1 close to one end of the pressing needle 108. The centering assembly comprises a clamping plate 301 rotatably connected to the main handle 101, and a torsional spring connected between the rotatable connection between the clamping plate 301 and the main handle 101. When the torsional spring is reset, the clamping plate 301 is attached to the main handle 101, a U-shaped opening is formed in the main handle 101 close to the clamping plate 301, and a U-shaped slot is formed in the clamping plate 301, and two limiting rods 302 are symmetrically and slidably connected to the U-shaped opening of the main handle 101. The ends of the two limiting rods 302 penetrating into the inner side of the U-shaped opening of the main handle 101 are fixedly connected with limiting plates 304, and the ends of the two limiting rods 302 penetrating out of the outer wall of the main handle 101 are sleeved with springs 304, one end of the spring 304 is fixedly connected with the outer surface of the limiting rod 302, and the other end of the spring 304 is fixedly connected with the outer surface of the main handle 101. The middle part of the side close to each other of the two limiting plates 304 is provided with a semicircular hole, and the two limiting plates 304 are made of rubber material.

[0040] It should be noted that the ear tag nail 1 is a structure known in the art, and the ear tag nail 1 comprises a main tag nail a and a secondary tag b.

[0041] It should be noted that the semicircular holes of the two limiting plates 304 can form a complete circular hole, and the complete circular hole is concentric with the pressing needle 108. The end of the two limiting plates 304 away from the limiting rod 302 and the side close to each other is provided with an inclined surface, which facilitates the entry of the ear tag nail 1.

[0042] The following is the whole working process and working principle of the above-mentioned embodiment:

[0043] Before marking, first hand press the dynamic handle 207, so that the dynamic handle 207 around its axis of rotation, also compression corresponding to the spring three 208, in the dynamic handle 207 axis of rotation will drive the round plate 206 synchronous rotation, reference Figure 4 And Figure 6 , the round plate 206 will be clockwise rotation, so that the rotation of the push rod 205 synchronous, push rod 205 lower end will be moved up accordingly, the top of the push rod 205 will push the plate 203 connected with the rotation of the two slide rod 201 up, and compression two spring two 204, and the push plate 203 up will also drive the arc shaped card plate 210 up, so that the arc shaped card plate 210 on the limit convex rod 202 from the card mouth 209 on the rotating wheel 102, let the rotating wheel 102 no longer be limited, at this time hand hold one side of the knob 104, according to the arrow direction of the rotating wheel 102 rotation, the knob 104 will drive the rotating wheel 102 synchronous rotation, rotating wheel 102 rotation will drive the incomplete gear 103 rotation, the knob 104 rotation a circle, as shown in Figure 6 , the counterclockwise rotation of the incomplete gear 103 will drive the L shaped rack 105 up, L shaped rack 105 up will stretch the spring one 109, but because the incomplete gear 103 only a part of the tooth, so when the incomplete gear 103 tooth does not mesh with the L shaped rack 105, under the action of the spring one 109 will drive the pressure bar 106 and L shaped rack 105 down reset. When the rotating wheel 102 rotation a circle, loose dynamic handle 207, at this time in the reset action of the supporting spring three 208 dynamic handle 207 will rotate reset, push rod 205 synchronous reset, spring two 204 reset will also push the plate 203 down reset on the slide rod 201, so that the arc shaped card plate 210 and limit convex rod 202 reset, limit convex rod 202 will be inserted into the card mouth 209 of the rotating wheel 102 after a circle, at this time the rotating wheel 102 and the main handle 101 rotation connection of the torsional spring is force storage.

[0044] It should be noted that the rotating wheel 102 and the knob 104 every rotation a circle, can complete a marking operation, if you want to continuously mark several times, can rotate the knob 104 several times. Rotate the knob 104 need to press the dynamic handle 207 can rotate the knob 104, and need to ensure that every time the knob 104 is rotated, the card mouth 209 can be aligned with the limit convex rod 202, so that the limit convex rod 202 can be inserted into the card mouth 209 after the dynamic handle 207 is loosened. Limit convex rod 202 is inserted into the card mouth 209, the rotating wheel 102 and the main handle 101 rotation connection of the torsional spring is in the force storage state.

[0045] Then, the main tag a of ear tag 1 is fitted onto the pressure pin 108, and the clamping plate 301 is pressed down so that the clamping plate 301 is not in contact with the main handle 101. At this time, the torsion spring at the rotatable connection between the clamping plate 301 and the main handle 101 deforms. The secondary tag b includes an auxiliary nail sleeve and a tag plate held by the clamping plate 301. The auxiliary nail sleeve includes a larger diameter end and a smaller diameter end. The larger diameter end of the auxiliary nail sleeve is placed horizontally between the clamping plate 301 and the main handle 101. Specifically, when inserting the secondary tag b, refer to... Figure 1 and Figure 8 When the sub-label b is inserted, the smaller diameter end of the auxiliary nail sleeve will first abut against the inclined surfaces of the two limiting plates 304. Then, as the sub-label b continues to enter horizontally, the larger diameter end of the auxiliary nail sleeve will enter between the clamping plate 301 and the main handle 101. At the same time, the smaller diameter end of the auxiliary nail sleeve will squeeze the two limiting plates 304 away from each other. The two limiting plates 304 will drive the limiting rod 302 to slide away on the main handle 101 and stretch the spring 303 until the auxiliary nail sleeve of the sub-label b enters the semi-circular hole of the two limiting plates 304. At this time, under the return spring 303, the two limiting plates 304 will clamp the smaller diameter end of the auxiliary nail sleeve, keeping the auxiliary nail sleeve of the sub-label b in the middle position of the two limiting plates 304. Then the clamping plate 301 can be loosened. Under the return action of the torsion spring, the larger diameter end of the auxiliary nail sleeve will be clamped, thus completely fixing the sub-label b. By setting a semi-circular hole on the limiting plate 304, the sub-tag b can be effectively stabilized in the center position. The center position can ensure that the ear tag pin 1 and the pressure pin 108 are accurately aligned, so that when piercing the animal's ear, it can proceed along the expected path, reducing unnecessary tissue pulling on the animal, avoiding the situation where the sub-tag b and the main tag pin a are misaligned and skewed, resulting in unsuccessful marking, ensuring the accuracy of marking and improving the efficiency of marking.

[0046] During marking, simply align the pressure needle 108 with the ear of the livestock to be marked, and press the handle 207 again. As it rotates, the spring 208 is compressed. The push rod 205 will also repeat the above steps, pushing the push plate 203 and the arc-shaped locking plate 210 upwards. The limiting protrusion 202 will disengage from the locking slot 209. At this time, the torsion spring at the rotating connection between the rotating wheel 102 and the main handle 101 releases its elasticity, causing the rotating wheel 102 to reverse (in... Figure 5The perspective is clockwise rotation), drive the incomplete gear 103 clockwise rotation, and then drive the L-shaped rack 105 to move down, thereby driving the L-shaped rack 105, the pressure rod 106 and the pressure needle 108 to move downward synchronously and rapidly, and compress the corresponding spring 109, so that the pressure needle 108 drives the main tag a to penetrate into the ear of the livestock and the secondary tag b, that is, the marking operation can be completed. Through the design of automatic marking by torsional spring reset, the burden of direct force of hands during each marking is greatly reduced. Compared with the traditional ear tag pliers which completely rely on manual application of large force to mark one by one, it is more labor-saving, so that more marking times can be completed in the same time, the work efficiency of wearing ear tags for livestock is significantly improved, and it is suitable for application in large-scale breeding farm animal ear tag wearing scenes.

[0047] It should be noted that after the pressure needle 108 rapidly descends, since the incomplete gear 103 has only a part of teeth, when the rotating wheel 102 rotates to the position where the teeth thereof are not engaged with the L-shaped rack 105, the pressure needle 108 will be reset upward under the action of the spring 109 until the rotating wheel 102 rotates one circle and resets to the original position, at which time the teeth of the incomplete gear 103 will be engaged with the L-shaped rack 105 again, and drive the L-shaped rack 105 to reset and maintain the engagement state with the L-shaped rack 105.

[0048] It should be noted that when the rotating wheel 102 rotates one circle, the bayonet 209 on the outer surface thereof will rotate again to be close to the limiting protruding rod 202, after the user loosens the handle 207, the two springs 204 will reset, and drive the limiting protruding rod 202 to be engaged with the bayonet 209 again, so that each rotation of the rotating wheel 102 can realize one marking operation, and through rotating the knob 104 to drive the rotating wheel 102 to rotate multiple times, multiple ear tags 1 can be marked continuously at one time, only the above-mentioned step of pressing the handle 207 needs to be repeated, and with the increase of the marking times, after the energy originally stored in the torsional spring at the rotating connection between the rotating wheel 102 and the main handle 101 is continuously consumed, the remaining energy available for effectively driving the pressure needle 108 to descend will be less and less, and after the energy of the torsional spring is released, the staff only needs to rotate the knob 104 again to drive the rotating wheel 102 and the torsional spring to rotate and store energy.

[0049] It should be added that in livestock breeding, the health condition is very important, the pressing needle 108 directly contacts the animal ear during use, and is easy to be contaminated with blood, tissue fluid, various bacteria and the like, and the pressing needle 108 is a consumable part, as the use frequency increases, the needle tip may be blunt, affecting the puncture effect, or bending, damage and the like, thereby causing the ear tag installation not to be smooth, excessive damage to the animal ear and the like, by adopting the threaded connection mode of the pressing needle 108 and the pressing rod 106, the pressing needle 108 used for marking can be conveniently disassembled, and the marking pressing needle 108 can be easily taken out, and the marking pressing needle 108 can be cleaned in an overall and detailed manner, and a new pressing needle 108 can be replaced, so that the subsequent ear tag wearing work can be normally and efficiently carried out, and the replacement operation is simple, and complex tools or professional maintenance are not required.

[0050] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A livestock ear tag clamp, characterized in that: Includes a main handle (101), a rotating wheel (102) rotatably connected to the main handle (101), a torsion spring provided at the rotatable connection between the rotating wheel (102) and the main handle (101), a knob (104) fixedly connected to the rotating wheel (102), an incomplete gear (103) fixedly connected to the middle of the rotating wheel (102), an L-shaped rack (105) meshing on one side of the incomplete gear (103), a pressure rod (106) fixedly connected to the lower end of the L-shaped rack (105), a limit ring (107) fixedly connected to the main handle (101), the pressure rod (106) slidably connected inside the limit ring (107), and a pressure needle (108) fixedly connected to the bottom end of the pressure rod (106) after it passes through the limit ring (107). An automatic marking assembly is provided on the main handle (101). The automatic marking assembly includes a slide rod (201) symmetrically fixedly connected to the main handle (101). A push plate (203) is slidably connected to the slide rod (201). A spring (204) is sleeved on each slide rod (201). A movable handle (207) is rotatably connected inside the main handle (101). A circular plate (206) is fixedly connected to the pivot of the movable handle (207). A push rod (205) is rotatably connected to the circular plate (206). The upper end of the push rod (205) is rotatably connected to the push plate (203). An arc-shaped locking plate (210) is fixedly connected to the push plate (203). A limit protrusion (202) is provided on the side of the arc-shaped locking plate (210) near the rotating wheel (102). A locking slot (209) is opened on the rotating wheel (102).

2. The livestock ear tag clamp according to claim 1, characterized in that: A spring (109) is fitted on the outer surface of the pressure rod (106). One end of the spring (109) is fixedly connected to the limiting ring (107), and the other end of the spring (109) is fixedly connected to the L-shaped rack (105).

3. The livestock ear tag clamp according to claim 1, characterized in that: One end of the second spring (204) is fixedly connected to the slide rod (201), and the other end is fixedly connected to the upper surface of the push plate (203).

4. The livestock ear tag clamp according to claim 1, characterized in that: A spring three (208) is fixedly connected between the main grip (101) and the moving grip (207).

5. The livestock ear tag clamp according to claim 1, characterized in that: The main handle (101) is provided with a centering component for centering the auxiliary ear tag (1) at one end near the pressure pin (108). The centering component includes a clamp (301) rotatably connected to the main handle (101), and a torsion spring is connected at the rotatable connection between the clamp (301) and the main handle (101).

6. The livestock ear tag clamp according to claim 5, characterized in that: The main handle (101) has a U-shaped opening at one end near the clamp (301), and the clamp (301) has a U-shaped groove. Two limiting rods (302) are symmetrically slidably connected at the U-shaped opening of the main handle (101). The two limiting rods (302) are fixedly connected to the end of the U-shaped opening of the main handle (101) with a limiting plate (304). The two limiting rods (302) are fitted with a spring four (303) at the end of the two limiting rods (302) that protrude from the outer wall of the main handle (101). One end of the spring four (303) is fixedly connected to the outer surface of the limiting rod (302), and the other end of the spring four (303) is fixedly connected to the outer surface of the main handle (101).

7. The livestock ear tag clamp according to claim 6, characterized in that: A semi-circular hole is provided in the middle of one side of the two limiting plates (304) that are close to each other.

8. The livestock ear tag clamp according to claim 7, characterized in that: The two limit plates (304) are made of rubber.

9. A livestock ear tag clamp according to claim 1 or 5, characterized in that: The pressure needle (108) is threadedly connected to the pressure rod (106). The pressure needle (108) includes a cylindrical head and a needle head fixedly connected to the cylindrical head. The outer surface of the cylindrical head is provided with an external thread. The bottom end of the pressure rod (106) is provided with a countersunk hole, and the countersunk hole is provided with an internal thread that matches the external thread of the pressure needle (108).

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