CN111759437A - A card slot adjustable universal cross connector - Google Patents

Abstract

The invention relates to a universal cross connector with adjustable clamping grooves, which comprises a connection system in the middle and two sets of clamping systems respectively arranged at both ends of the connection system. The clamping systems include clamping claws and locking blocks. The locking blocks Through the connection between the locking screw and the clamping claw, the locking block and the clamping claw form a clamping groove. Adjusting the locking screw can make the locking block move to adjust the size of the opening of the clamping groove. The end of the clamping system away from the clamping groove is connected with the connecting system. In the invention, the locking block and the clamping claw are movably connected in the clamping claw to form the clamping groove, and the relative position of the locking block and the clamping claw is adjusted by the locking screw, so as to flexibly adjust the size of the clamping groove and the size of the clamping groove. The size of the opening is so that the slot of the horizontal connector can adapt to the connecting rods of different specifications, and the installation is more convenient.

Description

A card slot adjustable universal cross connector

technical field

The invention relates to a horizontal connector, in particular to a universal horizontal connector with adjustable card slots.

Background technique

In spinal injury surgery, spinal fixator is usually used to fix the spine. The spinal fixator is composed of a screw-rod system and a transverse connector. The screw-rod system includes a pedicle screw connected to the pedicle and multiple screws on the same side of the spine. The connecting rods are connected in series with pedicle screws. The connecting rods replace the damaged spine to support the human body. Since pedicle screws and connecting rods are installed on both sides of the spine, in order to avoid the connecting rods and pedicle screws on both sides of the spine Uncontrollable displacement leads to damage to the vertebrae. Therefore, a transverse connector is usually used to connect the two connecting rods together, so that the left and right sides of the spine are connected into one body, improving the stability of the spinal fixator and ensuring Therapeutic effects on the spine.

The invention patent with the patent number of "2014205556705" discloses a universal cross-connector, which is composed of two cross-connector monomers connected to each other. In this patent, two ends of the two horizontal-connector monomers that are far away from each other are set There is a hook seat that is bent downward and buckled inwardly. A groove for clamping the connecting rod is formed in the hook seat. The groove opening of this structure is inward and downward. When installing, it is necessary to separate the two hook seats from the two connecting rods. The outer side moves inward, so that the connecting rod is stuck into the groove, so that the wound needs to be enlarged, the operation difficulty is increased, and the injury to the patient is increased.

In order to avoid the above technical problems, the invention patent No. "2017208414841" discloses a transverse connector for spinal fixation. The patent optimizes the design of the hook seat so that the groove opening on the hook seat is outward and downward. Thereby, the wound is reduced. However, the hook seat in this patent adopts an integrated design, and the change of the groove opening is inflexible, and the adaptability to connecting rods of different specifications is poor.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a horizontal connector with adjustable card slot, the size of the card slot and the opening size of the card slot can be flexibly adjusted to adapt to the connecting rods of different specifications and expand the scope of application.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is: a slot-adjustable universal joint, comprising a connecting system located in the middle and two sets of clamping systems respectively arranged at both ends of the connecting system, any set of clamps. The tightening system includes a claw and a locking block. The locking block is connected to the claw through a locking screw. The locking block and the claw form a slot. Adjusting the locking screw can make the locking block move to adjust the size of the slot opening. One end of the clamping system away from the clamping slot is connected with the connecting system, the claw includes a base, and one end of the base away from the connecting system is integrally formed with an upper hook body, and the free end of the upper hook body is bent downward, forming a joint with the base. The surrounding arc that opens downwards, a chute is provided on the end face of the base away from the connection system, the locking block is slidably inserted into the chute, the top of the base is provided with a through hole communicating with the chute, and the locking block The upper end is provided with a first threaded hole coaxial with the through hole, the locking screw is inserted into the chute from the upper end of the through hole and is threadedly connected with the first threaded hole on the locking block, and the lower edge of the locking block is integrally formed with an upward hook body One side extends out of the lower hook body outside the base, the lower hook body is opposite to the upper hook body, the lower hook body, the base and the upper hook body together form a clamping slot, and a clamping slot is formed between the free end of the lower hook body and the free end of the upper hook body. Opening; when turning the locking screw to drive the locking block to move downward, the lower hook body moves downward, and the free end of the lower hook body gradually moves away from the free end of the upper hook body, so that the opening of the slot is enlarged, otherwise, the opening of the slot is reduced.

As a preferred solution, the locking screw is in clearance fit with the through hole, the locking screw can swing in the through hole, the inner walls of the two sides of the chute are respectively provided with mutually symmetrical guide grooves, and the extension of the guide groove The direction is parallel to the axial direction of the through hole, and the outer walls of the two sides of the locking block are respectively provided with guide sliders corresponding to the guide grooves one-to-one. One side is composed of two intersecting guide planes, and the inner corners formed by the two guide planes are opposite to the arc surface.

As a preferred solution, the through hole is a counterbore.

As a preferred solution, the connection system includes a first connecting rod, a second connecting rod and a connecting screw for connecting the first connecting rod and the second connecting rod, and one end of the first connecting rod is connected to a set of clamping system The claw is connected, the other end is provided with an axially extending long hole, one end of the second connecting rod is connected with the claw of another set of clamping system, and the other end is provided with a second threaded hole, and the connecting screw passes through the long hole. The hole is threadedly connected with the second threaded hole.

As a preferred solution, the side of the first connecting rod facing the second connecting rod is provided with an oblong guide hole coaxially arranged with the long hole, the long diameter of the guide hole is the same as the long diameter of the long hole, and the short diameter of the guide hole is the same as the long diameter of the long hole. Larger than the short diameter of the long hole, a step surface is formed at the junction of the guide hole and the long hole, the side of the second connecting rod facing the first connecting rod is provided with a guide boss that cooperates with the guide hole, and the guide boss is along the first connecting rod. The axial length of the second connecting rod is less than the length of the long diameter of the guide hole, the two sides of the guide boss parallel to the axial direction of the second connecting rod are both plane and parallel to each other, and the second threaded hole is opened in the center of the guide boss, When the first link and the second link are connected, the guide boss is inserted into the guide hole and moves back and forth along the long diameter direction of the guide hole.

As a preferred solution, the guide boss is in clearance fit with the guide hole.

As a preferred solution, the first connecting rod includes a first connecting section, a first extending section, and a first ball joint connected in sequence, and the second connecting rod includes a second connecting section, a second extending section, Two ball joints, the first connecting section and the second connecting section are superimposed and the facing surfaces are both flat, the long hole and the guide hole are opened on the first connecting section, and the guide boss and the second threaded hole are arranged on the second connecting section On the segment, the first extension segment extends along the length direction of the first connection segment, the second extension segment extends along the length direction of the second connection segment, and the jaws of any clamping system are provided with a connection with the first ball head or the second connection segment. The accommodating cavity in which the two ball heads are matched, the first ball head and the second ball head are embedded in the accommodating cavity of the two claws in one-to-one correspondence, and are movably connected with the two claws.

As a preferred solution, the first extension section is a cylinder with a diameter smaller than the first ball head, and the second extension section is a cylinder with a diameter smaller than the second ball head. The mounting hole is connected to the cavity, and the size of the mounting hole is just enough for the first ball head or the second ball head to pass through. It is clamped between the first ball head and the cavity wall of the corresponding accommodating cavity, and the part of the retaining spring that is sleeved on the first extension section is clamped between the first extension section and the installation hole; the second extension section is also sleeved A circlip is connected, the bell mouth of the circlip is inserted into the corresponding accommodating cavity, and is clamped between the second ball head and the cavity wall of the accommodating cavity, and the part of the circlip sleeved on the second extension is clamped in the cavity. between the second extension section and the mounting hole.

As a preferred solution, an annular groove is formed on the cavity wall near the installation hole in the accommodating cavity, the annular groove is concentric with the installation hole, and the bell mouth of the circlip is clamped in the annular groove.

As a preferred solution, the circlip includes a cylindrical or conical sleeve, a conical clasp connected to one end of the sleeve, and a plurality of sleeves along the axial direction of the clasp are evenly distributed at one end of the clasp away from the sleeve. Tube extending slots, one of which runs through the entire circlip.

The beneficial effects of the present invention are: the present invention forms a slot together with the locking block and the claw movably connected in the claw, and adjusts the relative position of the locking block and the claw through the locking screw, so as to flexibly adjust the slot , and the opening size of the card slot, so that the card slot of the horizontal connector can adapt to the connecting rods of different specifications, and the installation is more convenient.

Description of drawings:

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the connection structure schematic diagram of the horizontal connector according to the present invention in use;

Figure 2 is an exploded view of the clamping system;

Figure 3 is a half-section view of the assembled structure of the clamping system;

Figure 4 is a bottom view of the jaw;

Figure 5 is an exploded view of the connection system;

Fig. 6 is the three-dimensional structure schematic diagram of the first connecting rod;

Fig. 7 is the three-dimensional structure schematic diagram of circlip;

FIG. 8 is a schematic diagram of the connection structure of the connection system and the clamping system.

In Figures 1 to 8: 100, connecting system, 200, clamping system, 300, connecting rod, 1, jaw, 101, base, 102, upper hook body, 103, surrounding arc, 104, chute, 105, Through hole, 106, accommodating cavity, 107, mounting hole, 108, annular groove, 109, guide groove, 2, locking block, 201, first threaded hole, 202, lower hook, 203, guide slider, 204 , arc surface, 205, guide plane, 206, intersecting line, 3, locking screw, 4, card slot, 5, first connecting rod, 501, first connecting section, 502, first extension section, 503, th A ball head, 6, the second connecting rod, 601, the second connecting section, 602, the second extension section, 603, the second ball head, 7, the connecting screw, 8, the long hole, 9, the guide hole, 10, the step face, 11, second threaded hole, 12, guide boss, 13, snap ring, 1301, sleeve, 1302, snap ring, 1303, notch.

Detailed ways:

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , the slot-adjustable universal joint includes a connecting system 100 in the middle and two sets of clamping systems 200 respectively arranged at both ends of the connecting system, and the clamping systems 200 are used to clamp the connecting rod 300 .

As shown in FIG. 2 to FIG. 4 , any set of clamping system 200 includes a claw 1 and a locking block 2 , the claw 1 includes a base 101 , and an upper hook body 102 is integrally formed with one end of the base 101 away from the connection system 100 . , the free end of the upper hook body 102 is bent downward to form an encircling arc 103 with an oblique downward opening together with the base 101. A sliding groove 104 is opened on the end face of the base 101 away from the connecting system 100, and the sliding groove 104 is located on the upper hook Below the body 102, the locking block 2 is slidably inserted into the chute 104, and the locking block 2 can only slide up and down in the chute 104, but cannot rotate. The top of the base 101 is provided with a through hole 105 that communicates with the chute 104. The through hole 105 is preferably a countersunk hole, and the nut of the locking screw 3 can be embedded in the countersunk hole to reduce muscle irritation, improve comfort, and ensure good bones. recovery effect. The upper end of the locking block 2 is provided with a first threaded hole 201 coaxially arranged with the through hole 105, and the locking screw 3 is inserted into the chute 104 from the upper end of the through hole 105 and is threadedly connected to the first threaded hole 201 on the locking block 2, The lower edge of the locking block 2 is integrally formed with a lower hook body 202 extending out of the base 101 from one side of the upper hook body 102. The lower hook body 202 is opposite to the upper hook body 102. A card slot 4 for clamping the connecting rod 300 is formed, and an opening of the card slot 4 is formed between the free end of the lower hook body 202 and the free end of the upper hook body 102; The opening of the slot 4 is downward and facing away from the connection system 100. When the locking screw 3 is turned to drive the locking block 2 to move downward, the lower hook body 202 is moved downward, and the free end of the lower hook body 202 gradually moves away from the upper hook body 102. end, the opening of the card slot 4 is enlarged, on the contrary, the opening of the card slot 4 is reduced.

In this embodiment, the locking screw 3 and the through hole 105 adopt clearance fit, so that the locking screw 3 can swing in the through hole 105. In this way, when the locking screw 3 is loose, the locking screw 3 can be locked by adjusting The axial direction of the screw 3 can quickly adjust the opening size of the card slot 4, which is more flexible and convenient to adjust.

As shown in FIGS. 2 and 4 , two inner walls of the chute 104 are respectively provided with mutually symmetrical guide grooves 109 . The extension direction of the guide grooves 109 is parallel to the axial direction of the through hole 105 . There are guide sliders 203 corresponding to the guide grooves 109 on the upper side respectively. The side of the guide slider 203 facing the card slot 4 is an arc surface 204, and the side facing away from the card slot 203 is composed of two intersecting guide planes. 205, the intersection line 206 of the two guide planes 205 is preferably the central axis of the arc surface 204, the inner corner formed by the two guide planes 205 is opposite to the arc surface 204, and the two guide platforms 205 limit the swing angle of the locking block 2 , to prevent the locking block 2 from being pushed by the connecting rod 300 to rotate during the locking process, thereby causing the opening of the clamping slot 4 to be too large, so that the connecting rod 300 cannot be clamped.

As shown in FIGS. 5 and 6 , the connection system 100 includes a first link 5 , a second link 6 and a connecting screw 7 for connecting the first link 5 and the second link 6 . One end is connected with the claw 1 of a set of clamping system 200, the other end is provided with an axially extending long hole 8, one end of the second connecting rod 6 is connected with the claw 1 of another set of clamping system 200, and the other end is There is a second threaded hole 11 in the part, the connecting screw 7 is threadedly connected with the second threaded hole 11 through the long hole 8, and the connecting screw 7 is inserted into the long hole 8. When the connecting screw 7 is loose, the first connecting rod 5 and the second link 6 can move relatively along the length of the long hole 8 to adjust the distance between the two tightening systems 200, so as to eliminate the deformation of the connecting rod 300 by the transverse connector as much as possible, so that the entire spinal fixator can be connected It is more stable and has better support and fixation effect on the spine.

The side of the first connecting rod 5 facing the second connecting rod 6 is provided with an oblong guide hole 9 coaxially arranged with the long hole 8. The long diameter of the guide hole 9 is consistent with the long diameter of the long hole 8, and the short guide hole 9 The diameter is larger than the short diameter of the long hole 8 , a step surface 10 is formed at the junction of the guide hole 9 and the long hole 8 , and the second connecting rod 6 is provided with a guide that cooperates with the guide hole 9 on the side facing the first connecting rod 5 The boss 12, the length of the guide boss 12 along the axial direction of the second connecting rod 6 is less than the length of the long diameter of the guide hole 9, and the two sides of the guide boss 12 parallel to the axial direction of the second connecting rod 6 are both plane and parallel to each other, The second threaded hole 11 is opened in the center of the guide boss 12 . When the first connecting rod 5 and the second connecting rod 6 are connected, the guide boss 12 is inserted into the guide hole 9 and back and forth along the long diameter direction of the guide hole 9 . move. The guide boss 12 is inserted into the guide hole 9 to make the connection between the first link 5 and the second link 6 more tightly. The guide boss 12 can limit the width of the first link 5 and the second link 6 in the long hole 8 Dislocation in the direction prevents the connecting screw 7 from being broken by shearing force, and maintains the long-term stability of the transverse connector.

In this embodiment, it is preferable to fit the guide boss 12 with the guide hole 9 in a clearance fit, which can not only make the relative movement between the first link 5 and the second link 6 more flexible, but also make the first link 5 more flexible. Relative to the second link 6 , it can swing at a certain angle, so as to further improve the adaptability of the cross-connector when connecting the connecting rod 300 .

As shown in FIGS. 5 and 6 , the first connecting rod 5 includes a first connecting segment 501 , a first extending segment 502 , and a first ball joint 503 connected in sequence, and the second connecting rod 6 includes a second connecting segment 601 connected in sequence , the second extension section 602, the second ball head 603, the first connecting section 501 and the second connecting section 601 are superimposed and the opposite faces are flat, the long hole 8 and the guide hole 9 are opened on the first connecting section 501 , the guide boss 12 and the second threaded hole 11 are arranged on the second connection section 601 , the first extension section 502 extends along the length direction of the first connection section 501 , and the second extension section 602 extends along the length direction of the second connection section 601 extend.

As shown in FIG. 3 , the jaw 1 of any clamping system 200 is provided with an accommodating cavity 106 which is matched with the first ball head 503 or the second ball head 603 . As shown in FIGS. 1 and 8 , the first The ball head 503 and the second ball head 603 are embedded in the accommodating cavity 106 of the two jaws 1 in a one-to-one correspondence, and are movably connected with the two jaws 1 to form a universal connection structure, so that the clamping system 200 can be relatively The connection system 100 adjusts the direction so as to easily correspond to the situation where the two connection rods 300 are not parallel.

As shown in FIG. 5 , the first extension section 502 is a cylinder with a diameter smaller than the first ball head 503 , and the second extension section 602 is a cylinder with a diameter smaller than the second ball head 603 . As shown in FIG. 3 , a mounting hole 107 communicating with the accommodating cavity 106 is provided on any of the jaws 1 , and the size of the mounting hole 107 is just enough for the first ball head 503 or the second ball head 603 to pass through, such as As shown in FIG. 8 , a horn-shaped circlip 13 is sleeved on the first extension section 502 , the bell mouth of the circlip 13 is inserted into the accommodating cavity 106 , and is clamped between the first ball head 503 and the cavity corresponding to the accommodating cavity 106 . Between the walls, the part of the circlip 13 sleeved on the first extension section 502 is clamped between the first extension section 502 and the mounting hole 107; the second extension section 602 is also socketed with a circlip 13, the circlip The bell mouth of 13 is inserted into the corresponding accommodating cavity 106, and is clamped between the second ball head 603 and the cavity wall of the accommodating cavity 106. between the extension section 602 and the mounting hole 107 . The retaining spring 13 can ensure a stable connection between the connection system 100 and the clamping system 200 , and prevent the first ball head 503 or the second ball head 603 from coming out of the installation hole 107 .

3 and 8, an annular groove 108 is formed on the cavity wall of the accommodating cavity 106 close to the installation hole 107. The annular groove 108 is concentric with the installation hole 107, and the bell mouth of the retaining spring 13 is clamped in the annular groove 108. , thereby positioning the circlip 13 to prevent the circlip 13 from moving back and forth.

In this embodiment, the accommodating cavity 106 is the chute 104 , and the locking block 2 is just opposite to the first ball head 503 or the second ball head 603 , and can also lift the first ball head 503 or the second ball head 603 to the limit.

As shown in FIG. 7 , the circlip 13 includes a cylindrical or conical sleeve 1301 , a conical clasp 1302 connected to one end of the sleeve 1301 , and a plurality of clasps 1302 are evenly distributed in the circumferential direction at one end of the clasp 1302 away from the sleeve 1301 Each of the notches 1303 extending toward the sleeve 1301 along the axial direction thereof extends to the junction of the sleeve and the retaining ring, and one of the notches 1303 runs through the entire retaining ring 13 . The snap ring 1302 is divided into a multi-lobe shape by the slits 1303, so that it has the elasticity of shrinking inward or expanding outward, and the slit 1303 running through the entire snap ring 13 can make the entire snap ring 13 expand outward, so that the first ball The head 503 or the second ball head 603 passes through the retaining spring 13 .

The working principle of the present invention is as follows: as shown in FIGS. 1 to 8 , first loosen the connecting screw 7 and the two locking screws 3 of the two clamping systems 200 , and then according to the distance between the two connecting rods 300 , by controlling the first connection The rod 5 and the second link 6 slide along the long hole 8 so that the distance between the two clamping systems 200 is smaller than the distance between the two connecting rods 300 . Then, firstly connect the slot 4 of a clamping system 200 to a connecting rod 300 , turn the locking screw 3 to move the lower hook body 202 upward, and loosely clamp the connecting rod 300 in the slot 4 . Then another clamping system 200 is loosely clamped on another connecting rod 300 .

Then, the two clamping systems 200 are rotated and adjusted, so that the clamping systems 200 are rotated around the connecting rod 300, and the connecting system 100 is as close to the spine as possible. After adjusting the position of the connecting system 100, the two locking screws 3 are locked. The two clamping systems 200 are made to clamp the corresponding connecting rods 300, and finally the connecting screws 7 are tightened. The horizontal connector is installed.

When the clamping system 200 is clamped on the connecting rod 300, the locking block 2 can be moved down by turning the locking screw 3, and the opening of the clamping slot 4 can be opened. The block 2 swings to move the lower hook body 202 in a direction away from the upper hook body 102 , thereby rapidly expanding the opening of the card slot 4 to quickly and easily hook the connecting rod 300 into the corresponding card slot 4 .

The cross connector of the present invention can adapt to the connection requirements of two connecting rods 300 at any angle and any distance, so as to realize easy and stable installation, avoid the deformation of the connecting rod 300, and eliminate the extra stress on bones caused by installing the cross connector.

The above-mentioned embodiments are only illustrative of the principles and effects of the present invention, as well as some applied embodiments, but are not intended to limit the present invention; it should be pointed out that for those of ordinary skill in the art, without departing from the present invention Under the premise of the concept, several modifications and improvements can also be made, which all belong to the protection scope of the present invention.

Claims (10)

1. A slot-adjustable universal joint, comprising a connection system (100) in the middle and two sets of clamping systems (200) respectively arranged at both ends of the connection system, characterized in that any set of clamping systems (200) includes a clamping claw (1) and a locking block (2), the locking block (2) is connected with the clamping claw (1) through a locking screw (3), and the locking block (2) is connected with the clamping claw (1) A card slot (4) is formed. Adjusting the locking screw (3) can make the locking block (2) move to adjust the opening size of the card slot (4). The end of the clamping system (200) away from the card slot (4) is connected to the The system (100) is connected, and the claw (1) includes a base (101), and an upper hook body (102) is integrally formed with one end of the base (101) away from the connection system (100), and the upper hook body (102) is free The end is bent downward, and together with the base (101), a surrounding arc (103) that opens downward is formed, and a chute (104) is provided on the end face of the base (101) away from the connection system (100) for locking The block (2) is slidably inserted into the chute (104), the top of the base (101) is provided with a through hole (105) communicating with the chute (104), and the upper end of the locking block (2) is provided with a through hole (105) A coaxially arranged first threaded hole (201), the locking screw (3) is inserted into the chute (104) from the upper end of the through hole (105) and the first threaded hole (201) on the locking block (2) ) screw connection, the lower edge of the locking block (2) is integrally formed with a lower hook body (202) extending out of the base (101) from one side of the upper hook body (102), the lower hook body (202) and the upper hook body (102) ), the lower hook body (202), the base (101) and the upper hook body (102) together form a slot (4), and a slot (4) is formed between the free end of the lower hook body (202) and the free end of the upper hook body (102). (4) opening; when turning the locking screw (3) to drive the locking block (2) to move downward, it drives the lower hook body (202) to move downward, and the free end of the lower hook body (202) gradually moves away from the upper hook body (202). 102) At the free end, the opening of the card slot (4) is enlarged, on the contrary, the opening of the card slot (4) is reduced. 2. The slot-adjustable universal joint according to claim 1, wherein the locking screw (3) is in clearance fit with the through hole (105), and the locking screw (3) can be inserted into the through hole Swing in (105), two inner walls of the chute (104) are respectively provided with mutually symmetrical guide grooves (109), the extending direction of the guide groove (109) is parallel to the axial direction of the through hole (105), The two outer walls of the locking block (2) are respectively provided with guide sliders (203) corresponding to the guide grooves (109) one-to-one, and the side of the guide sliders (203) facing the clamping groove (4) is a circular arc surface (204), the side facing away from the card slot (203) is formed by two intersecting guide planes (205), and the inner corner formed by the two guide planes (205) is opposite to the arc surface (204). 3 . The adjustable card slot universal universal connector according to claim 1 , wherein the through hole ( 105 ) is a counterbore. 4 . 4. The slot-adjustable universal joint according to any one of claims 1 to 3, wherein the connection system (100) comprises a first connecting rod (5) and a second connecting rod (6) and a connecting screw (7) for connecting the first connecting rod (5) and the second connecting rod (6), one end of the first connecting rod (5) and a set of clamping jaws (1) of the clamping system (200) The other end is provided with an axially extending long hole (8), one end of the second connecting rod (6) is connected with the jaw (1) of another set of clamping system (200), and the other end is provided with a In the second threaded hole (11), the connecting screw (7) passes through the long hole (8) and is threadedly connected with the second threaded hole (11). 5 . The adjustable card slot universal joint according to claim 4 , wherein the side of the first connecting rod ( 5 ) facing the second connecting rod ( 6 ) is provided with the same slot as the long hole ( 8 ). 6 . The long diameter of the guide hole (9) is the same as the long diameter of the long hole (8), and the short diameter of the guide hole (9) is larger than the short diameter of the long hole (8). A step surface (10) is formed at the junction of (9) and the long hole (8), and a side of the second connecting rod (6) facing the first connecting rod (5) is provided with a guide hole (9). The guide boss (12), the length of the guide boss (12) along the axial direction of the second connecting rod (6) is less than the length of the long diameter of the guide hole (9), and the guide boss (12) is parallel to the second connecting rod (6) The two axial sides are both plane and parallel to each other, the second threaded hole (11) is opened in the center of the guide boss (12), when the first connecting rod (5) and the second connecting rod (6) are connected , the guide boss (12) is inserted into the guide hole (9) and moves back and forth along the long diameter direction of the guide hole (9). 6 . The adjustable card slot universal joint according to claim 5 , wherein the guide boss ( 12 ) is in clearance fit with the guide hole ( 9 ). 7 . 7. The slot-adjustable universal joint according to claim 4, wherein the first connecting rod (5) comprises a first connecting section (501) and a first extending section (502) that are connected in sequence ), a first ball joint (503), and the second connecting rod (6) includes a second connecting segment (601), a second extending segment (602), and a second ball joint (603) that are connected in sequence. The segment (501) and the second connecting segment (601) are overlapped and the facing surfaces are both planes. The long hole (8) and the guide hole (9) are opened on the first connecting segment (501), and the guide boss (12) and The second threaded hole (11) is provided on the second connecting section (601), the first extending section (502) extends along the length direction of the first connecting section (501), and the second extending section (602) is along the second connecting section (601) extends in the length direction, and a accommodating cavity (106) that cooperates with the first ball head (503) or the second ball head (603) is opened on the jaw (1) of any clamping system (200). , the first ball head ( 503 ) and the second ball head ( 603 ) are embedded in the accommodating cavity ( 106 ) of the two claws ( 1 ) in a one-to-one correspondence, and are movably connected with the two claws ( 1 ). 8 . The adjustable card slot universal joint according to claim 7 , wherein the first extension section ( 502 ) is a cylinder with a diameter smaller than that of the first ball head ( 503 ), and the second extension section (602) is a cylinder with a diameter smaller than that of the second ball head (603). Any jaw (1) is provided with a mounting hole (107) communicating with the accommodating cavity. The size of the mounting hole (107) is just enough For the first ball head (503) or the second ball head (603) to pass through, a horn-shaped circlip (13) is sleeved on the first extension section (502), and the bell mouth of the circlip (13) is inserted and accommodated In the cavity (106), it is clamped between the first ball head (503) and the cavity wall of the corresponding accommodating cavity (106). Between the first extension section (502) and the mounting hole (107); the second extension section (602) is also sleeved with a circlip (13), and the bell mouth of the circlip (13) is inserted into the corresponding accommodating cavity ( 106), it is clamped between the second ball head (603) and the cavity wall of the accommodating cavity (106), and the part of the retaining spring (13) sleeved on the second extension between the extension (602) and the mounting hole (107). 9. The slot-adjustable universal joint according to claim 8, wherein an annular groove (108) is formed on the cavity wall of the accommodating cavity (106) close to the mounting hole (107). , the annular groove (108) is concentric with the installation hole (107), and the bell mouth of the retaining spring (13) is clamped in the annular groove (108). 10 . The adjustable card-slot universal joint according to claim 8 , wherein the circlip ( 13 ) comprises a cylindrical or cone-shaped sleeve ( 1301 ), which is connected to the sleeve ( 1301 ) A cone-shaped snap ring (1302) at one end, one end of the snap ring (1302) away from the sleeve (1301) is circumferentially evenly distributed with a plurality of notches (1303) extending toward the sleeve (1301) along its axial direction, one of which is cut. The groove (1303) runs through the entire circlip (13).

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