TWM560583U - Clamp - Google Patents

Abstract

The invention relates to a clamp, comprising a chuck (1), an angle adjusting mechanism (2) and a connecting mechanism, characterized in that the chuck (1) is arranged at an angle adjusting mechanism (2), and the angle adjusting mechanism (2) Moving along a circumferential trajectory, the trailing end of the collet (1) is located on the circumferential trajectory, the front end of the collet (1) is located at the center of the circumferential trajectory, when the angle adjusting mechanism (2) is along When the circular trajectory moves, the moving distance is the same as the moving distance of the chuck (1), so that the angle adjustment of the two is also the same.

Description

Fixture

The present invention relates to a clamp, and more particularly to an omnidirectional adjustment clamp.

Gemstone inlays such as gemstone rings, gemstone pendants, and brooches are usually provided with a plurality of fixing claws on the ring or the fixing member, and the gemstone is fixed by the fixing claws. Gemstones are expensive materials, which place high demands on the robustness of their installation. The current gemstone decorations have only clear requirements on materials and processes, but there is no test in the degree of firmness or force of the gemstone fixing claws, and there is no corresponding test instrument, and the gemstones fall off, which seriously affects the products. Quality.

However, at present, the industry does not have the standard for detecting the degree of firmness or force of the inlaid decorative claws, and the test instruments are not standardized, which makes it difficult to determine the accuracy and comparison of the measurement data. There is no scientific and standardized test method and data analysis method for the design and the degree of force of the fixed claw. At the same time, the fixed claws usually form a certain angle with the main surface of the inlaid ornament, and the angle is different according to the size of the gemstone and the number of cuts, the number of claws and the mosaic design. The angle between the fixed claw and the main body surface is not adjusted to reach the horizontal direction and perpendicular to the direction of the force application. The obtained test data deviates from the actual force of the fixed claw, and the data obtained by the fixed claws with different process designs cannot be compared.

The purpose of the present invention is to provide an omnidirectional adjustment fixture suitable for, but not limited to, gemstone inlays of different materials, sizes and designs, at least one of the above problems.

To achieve the above object, according to an aspect of the present invention, an omnidirectional adjustment jig is provided, including a collet, an angle adjustment mechanism, a height adjustment mechanism, a horizontal adjustment mechanism, and a fixing plate, and the angle adjustment mechanism is used to adjust the angle of the collet. The height adjusting mechanism is used for adjusting the position of the chuck in the vertical direction, the horizontal adjusting mechanism is for adjusting the position of the chuck in the horizontal direction, and the fixing plate is used for supporting the chuck, the angle adjusting mechanism, the height adjusting mechanism and the horizontal adjusting mechanism . Therefore, the angle adjustment mechanism, the height adjustment mechanism, and the horizontal adjustment mechanism can be used to adjust the chuck in multiple directions, so that the workpiece to be tested clamped by the chuck is adjusted to the horizontal and perpendicular to the angle of the inlaid ornament fixing claw and the main body surface. The position of the force direction makes the fixed claws have the best test position and angle, which improves the reliability of the test. At the same time, the rotatable chuck enables each claw on the fixed claw to be rotated to the appropriate test position. The jig is adapted to be tested for a plurality of fixed jaws of the device to be tested, and a plurality of types of fixed claws.

In some embodiments, the collet is disposed on the angle adjusting mechanism, and the angle adjusting mechanism, the height adjusting mechanism, and the horizontal adjusting mechanism are sequentially coupled, and the horizontal adjusting mechanism is disposed on the fixing plate. Therefore, the positional relationship of the above-mentioned various mechanisms makes the clamp structure simple and convenient to use.

In some embodiments, the collet can be disposed 360 degrees of rotation at the top end of the angle adjustment mechanism. Thereby, the collet can be rotated, and when the collet grips the ring, the plurality of fixing claws of the ring can be rotated to the same horizontal position for testing without disassembling the ring.

In some embodiments, the top end of the angle adjusting mechanism is provided with a first positioning member, and the first positioning member is screwed with the collet, thereby realizing the rotation of the collet, the structure is simple, and the operation is convenient.

In some embodiments, the angle adjustment mechanism includes an adjustment frame and a second positioning member. The adjustment frame is provided with an arcuate groove, and the second positioning member is connected to the height adjustment mechanism through the arcuate groove, and the adjustment frame is provided with an angular scale. Thus, the curved groove has a limit function, which defines the angle adjustment range of the adjustment frame.

In some embodiments, the height adjustment mechanism includes a sleeve, a support rod, and a The three positioning members are sleeved on the support rod, the sleeve is provided with a vertical groove, and the third positioning member is connected to the support rod through the vertical groove. Thereby, the sleeve can be moved up and down, and the vertical groove serves as a limit guiding function.

In some embodiments, the horizontal adjustment mechanism includes a pressure plate, a movable plate and a locking screw. The movable plate is located between the pressure plate and the fixed plate. The pressure plate is provided with an operation hole, and the bottom end of the support rod is fixedly connected to the movable plate through the operation hole. The locking screw is threadedly connected to the fixing plate through the pressure plate. Thereby, the movable plate can be moved between the pressure plate and the fixed plate, and the locking screw functions as a positioning.

In some embodiments, the opening area of the operation hole is larger than the cross-sectional area of the support rod, so that the support rod can be moved in the operation hole, thereby realizing the horizontal adjustment of the support rod, and the horizontal movement of the support rod can be left and right. Move, it can also be a rotation.

In some embodiments, the collet includes a fourth positioning member and two clips, and the fourth positioning member is threadedly coupled to the other clip through a clip, so that the collet has sufficient force to meet the firmness. Testing requirements.

In some embodiments, one of the two clips is provided with a sliding slot, and the other clip is provided with a guiding piece, and the guiding piece is slidably engaged with the sliding groove, thereby ensuring the positional relationship between the two clamping pieces, and the relative movement of the two clamping pieces is also more smooth.

In one embodiment, the present invention provides an omnidirectional adjustment jig comprising a collet (1), an angle adjustment mechanism (2), a height adjustment mechanism (3), a level adjustment mechanism (4), and a fixed plate (5). The angle adjustment mechanism (2) has an angular scale for adjusting the angle of the chuck (1), and the height adjustment mechanism (3) is for adjusting the position of the chuck (1) in the vertical direction, The horizontal adjustment mechanism (4) is for adjusting the position of the chuck (1) in the horizontal direction, and the fixing plate (5) is for supporting the chuck (1), the angle adjusting mechanism (2), and the height adjusting mechanism ( 3) and level adjustment mechanism (4).

In one embodiment, the collet (1) is disposed at an angle adjustment mechanism (2), and the angle adjustment mechanism (2), the height adjustment mechanism (3), and the level adjustment mechanism (4) are sequentially coupled, the level The adjustment mechanism (4) is disposed on the fixing plate (5).

In one embodiment, the angle adjustment mechanism (2) is movable along a circumferential trajectory on which the trailing end of the collet (1) is located, the front end of the collet (1) being located at the center of the circumferential trajectory When the angle adjusting mechanism (2) moves along the circumferential trajectory, the moving distance of the angle adjusting mechanism (2) coincides with the moving distance of the chuck (1), so that the angle adjustment of the two is also the same, and the fixed claw angle of the measured degree is transparent. The adjustment angle of the angle adjustment mechanism (2) can be accurately adjusted to be perpendicular to the direction of the pulling force.

In one embodiment, the collet (1) is rotatably disposed 360° at the top end of the angle adjustment mechanism (2).

In one embodiment, the top end of the angle adjustment mechanism (2) is provided with a first positioning member (6) that is threadedly coupled to the collet (1).

In one embodiment, the angle adjustment mechanism (2) includes an adjustment frame (21) and a second positioning member (22), the adjustment frame (21) is provided with an arcuate groove (23), and the second positioning member (22) is connected to the height adjustment mechanism (3) through an arcuate groove (23) with an angular scale.

In one embodiment, the height adjustment mechanism (3) includes a sleeve (31), a support rod (32) and a third positioning member (33), the sleeve (31) being sleeved on the support rod (32) The sleeve (31) is provided with a vertical groove (34), and the third positioning member (33) is connected to the support rod (32) through the vertical groove (34).

In one embodiment, the horizontal adjustment mechanism (4) comprises a pressure plate (41), a movable plate (42) and a locking screw (43), and the moving plate (42) is located at the pressure plate (41) and the fixed plate (5) The pressure plate (41) is provided with an operation hole (44), and the bottom end of the support rod (32) is fixedly connected to the movable plate (42) through the operation hole (44), the locking screw (43) ) is threaded through the pressure plate (41) and the fixed plate (5).

In one embodiment, the aperture of the aperture (44) is larger than the cross-sectional area of the support rod (32) to enable the support rod (32) to move within the aperture (44).

In one embodiment, the collet (1) comprises a fourth positioning member (11) and two clips (12), the fourth positioning member (11) passing through a clip (12) and another clip The piece (12) is threaded.

In one embodiment, one of the two clips (12) is provided with a sliding slot (13), and the other clamping piece (12) is provided with a guiding piece (14), the guiding piece (14) and the sliding slot (13) ) Sliding fit.

In one embodiment, the present invention provides a clamp comprising a collet (1), an angle adjustment mechanism (2) and a coupling mechanism, characterized in that the collet (1) is disposed at an angle adjustment mechanism (2), The angle adjusting mechanism (2) is movable along a circumferential trajectory on which the trailing end of the collet (1) is located, the front end of the collet (1) is located at the center of the circumferential trajectory, when the angle adjusting mechanism (2) When moving along the circumferential trajectory, the moving distance is the same as the moving distance of the chuck (1), so that the angle adjustment of the two is also the same.

In one embodiment, the collet (1) is rotatably disposed 360° at the top end of the angle adjustment mechanism (2).

In one embodiment, the top end of the angle adjustment mechanism (2) is provided with a first positioning member (6) that is threadedly coupled to the collet (1).

In one embodiment, the angle adjustment mechanism (2) includes an adjustment frame (21) and a second positioning member (22), the adjustment frame (21) is provided with an arcuate groove (23), and the second positioning member (22) is connected to the connecting mechanism through an arcuate groove (23) with an angular scale.

In one embodiment, the collet (1) comprises a fourth positioning member (11) and two clips (12), the fourth positioning member (11) passing through a clip (12) and another clip The piece (12) is threaded.

In one embodiment, one of the two clips (12) is provided with a sliding slot (13), and the other clamping piece (12) is provided with a guiding piece (14), the guiding piece (14) and the sliding slot (13) )slip Matching.

In one embodiment, the connection mechanism includes a height adjustment mechanism (3), a horizontal adjustment mechanism (4), and a fixing plate (5), the angle adjustment mechanism (2), the height adjustment mechanism (3), and the level adjustment mechanism ( 4) The connection adjustment mechanism (4) is disposed on the fixing plate (5) in sequence.

In one embodiment, the height adjustment mechanism (3) includes a sleeve (31), a support rod (32) and a third positioning member (33), the sleeve (31) being sleeved on the support rod (32) The sleeve (31) is provided with a vertical groove (34), and the third positioning member (33) is connected to the support rod (32) through the vertical groove (34).

In one embodiment, the horizontal adjustment mechanism (4) comprises a pressure plate (41), a movable plate (42) and a locking screw (43), and the moving plate (42) is located at the pressure plate (41) and the fixed plate (5) The pressure plate (41) is provided with an operation hole (44), and the bottom end of the support rod (32) is fixedly connected to the movable plate (42) through the operation hole (44), the locking screw (43) ) is threaded through the pressure plate (41) and the fixed plate (5).

In one embodiment, the aperture of the aperture (44) is larger than the cross-sectional area of the support rod (32) to enable the support rod (32) to move within the aperture (44).

In one embodiment, the present invention further provides a method of testing a ring fixing claw using the clamp, characterized by the steps of: clamping the ring using the chuck (1), the fixing claw being located outside the chuck (1), The angle between the fixed claw and the horizontal line is α' and on the center of the circumferential trajectory of the angle adjusting mechanism (2); moving the angle adjusting mechanism (2) to adjust the fixing claw to the level; and performing the fixing claw that has reached the level test.

In one embodiment, the angle adjustment mechanism (2) further comprises an adjustment frame (21) with an angular scale showing a movement angle α, and when step (ii), α is adjusted to α 'Let the claws reach the level.

The beneficial effects of the novel are: using an angle adjustment mechanism and a height adjustment machine The structure and the horizontal adjustment mechanism can adjust the chuck in multiple directions, so that the workpiece to be tested clamped by the chuck is adjusted to a horizontal position and perpendicular to the direction of the force according to the angle of the inlaid ornament fixing claw and the main body surface, so that the fixing claw has The best test position and angle improve the reliability of the test. At the same time, the 360° rotating chuck enables each claw on the fixed claw to be rotated to the same test position, which makes the clamp suitable for testing. Testing of multiple fixed jaws, multiple types of fixed jaws. The rotatable setting of the collet can test a plurality of fixed claws of the test piece without disassembling the test piece. On the other hand, by adjusting the angle scale on the angle adjustment mechanism, the plurality of fixed claws are tested at the same horizontal position, and the obtained measurement data is scientific and accurate, and is consistent with the actual stress condition of the gemstone fixing claw, and can reach the specification. Accurately analyze the effect of the firmness or degree of force of the fixed jaw.

1‧‧‧ chuck

2‧‧‧ Angle adjustment mechanism

3‧‧‧ Height adjustment mechanism

4‧‧‧Level adjustment mechanism

5‧‧‧ fixed plate

6‧‧‧First positioning piece

7‧‧‧Installation joints

11‧‧‧fourth positioning piece

12‧‧‧ Clips

13‧‧‧Chute

14‧‧‧Leading film

21‧‧‧Adjustable frame

22‧‧‧Second positioning parts

23‧‧‧ arc slot

31‧‧‧ sleeve

32‧‧‧Support rod

33‧‧‧ Third positioning piece

34‧‧‧ vertical slot

41‧‧‧ pressure plate

42‧‧‧moving board

43‧‧‧Locking screws

44‧‧‧Operation hole

FIG. 1 is a schematic structural view of an omnidirectional adjustment jig according to an embodiment of the present invention.

2 is a schematic view showing the adjustment of the angle adjusting mechanism of the jig shown in FIG. 1.

3 is an axial cross-sectional view of the height adjusting mechanism of the jig shown in FIG. 1.

Fig. 4 is a view showing a force value-deformation of the sample 1 using the omnidirectional adjustment jig of the present invention.

FIG. 5 is a force-deformation diagram of the sample 6 detected using a wedge-shaped stretching jig.

The present invention will be further described in detail below with reference to the accompanying drawings.

Figures 1-3 schematically illustrate an omnidirectional adjustment clamp in accordance with an embodiment of the present invention.

As shown in FIG. 1 , the omnidirectional adjustment clamp comprises a chuck 1 , an angle adjustment mechanism 2 , a height adjustment mechanism 3 , a horizontal adjustment mechanism 4 and a fixing plate 5 , and the angle adjustment mechanism 2 is used for adjusting the angle and height of the chuck 1 . The adjusting mechanism 3 is used to adjust the position of the chuck 1 in the vertical direction, water The flat adjustment mechanism 4 is for adjusting the position of the chuck 1 in the horizontal direction, and the fixing plate 5 is for supporting the chuck 1, the angle adjusting mechanism 2, the height adjusting mechanism 3, and the level adjusting mechanism 4.

In the present embodiment, the chuck 1 is provided to the angle adjusting mechanism 2, and the angle adjusting mechanism 2, the height adjusting mechanism 3, and the horizontal adjusting mechanism 4 are sequentially coupled to each other, and the horizontal adjusting mechanism 4 is provided to the fixing plate 5.

The collet 1 includes a fourth positioning member 11 and two clips 12. The fourth positioning member 11 is composed of a handle nut and a positioning rod. The handle nut is disposed at the end of the positioning rod, and the other end of the positioning rod is threadedly connected to the other clip 12 through a clip 12, and the handle nut can be adjusted by rotating the handle nut. The spacing between the two clips enables clamping and disassembly of the workpiece to be tested.

One of the two clips 12 is provided with a sliding slot 13 and the other clamping piece 12 is provided with a guiding piece 14 which is slidably engaged with the sliding slot 13. When the spacing of the two clips 12 is adjusted, the guide sheets 14 are slidably fitted in the chutes 13, so that the adjustment process is more stable.

The angle adjusting mechanism 2 includes an adjusting frame 21 and a second positioning member 22, and the adjusting frame 21 is provided with an arcuate groove 23. The second positioning member 22 is composed of a handle nut and a positioning rod. The handle nut is disposed at an end of the positioning rod. The positioning rod is screwed to the height adjusting mechanism 3 through the arcuate groove 23, and the rotation of the handle nut enables the adjustment frame 21 to move. Under the definition of the arcuate groove 23, the mounting angle of the adjusting frame 21 is changed, the angle of the chuck 1 is adjusted, and the angle of the fixing claw is adjusted to improve the reliability of the fastness test. The arc of the curved groove 23 is an adjustable angular range of the adjustment frame 21. An angle scale is provided on the adjustment frame 21 to facilitate angle adjustment.

The angle adjusting mechanism 2 can be moved along a circular trajectory, and the trailing end of the collet 1 is located on the circular trajectory, and the front end of the collet 1 is located at the center of the circular trajectory, and when the angle adjusting mechanism 2 moves along the circumferential trajectory, the moving angle thereof It is consistent with the moving angle of the chuck 1. The measured fixed claw angle can be accurately adjusted to be perpendicular to the pulling direction by the adjustment angle of the angle adjusting mechanism 2.

As shown in Figure 2, when the fixed claw of the ring is tested, the chuck 1 is clamped or The ring, the fixed claw is located outside the chuck 1, and the angle between the fixed claw and the horizontal line is α'. The fixed claw is placed on the center of the circular trajectory of the adjusting frame 21, and the adjusting frame 21 is moved. The moving distance of the adjusting frame 21 along the circumferential trajectory is Arc, the moving angle is α, and the arrow A is the moving direction of the adjusting frame. The moving distance of the extension line of the Arc and the fixed claw on the circumferential track is equal. Similarly, when α = α', the fixed claw is adjusted to the horizontal position, and at this time, the pulling force of the fixed claw can be accurately measured. Therefore, according to the different angle α' of the fixed claw, it is only necessary to rotate the angle scale of the adjustment frame 21 to α.

The collet 1 is rotatably disposed at the top end of the mount 21. The first positioning member 6 is disposed at the top end of the adjustment frame 21 of the angle adjusting mechanism 2. The first positioning member 6 is composed of a handle nut and a positioning rod. The handle nut is disposed at an end of the positioning rod, and the positioning rod is threadedly connected to one of the two clips of the chuck 1 through the adjusting frame 21. Rotating the handle nut allows the collet 1 to be rotated 360° to adjust the mounting angle of the collet 1 to facilitate testing of the plurality of fixed jaws of the device to be tested. The rotation of the collet 1 and the angle of the adjustment frame 21 are adjusted in two different planes, further in two perpendicular planes.

As shown in FIG. 3, the height adjusting mechanism 3 includes a sleeve 31, a support rod 32 and a third positioning member 33. The sleeve 31 is sleeved on the support rod 32, and the sleeve 31 is provided with a vertical groove 34. The third positioning member 33 is composed of a handle knob and a positioning rod. The handle nut is disposed at an end of the positioning rod, and the positioning rod is connected to the support rod 32 through the vertical groove 34. The handle nut is rotated to move the sleeve 31 and the support rod 32 relative to each other to achieve height adjustment, and the vertical groove 34 serves as a limit. The top end of the sleeve 31 cooperates with the second positioning member 22 of the angle adjustment mechanism 2.

The level adjusting mechanism 4 includes a pressure plate 41, a movable plate 42, and a locking screw 43. The moving plate 42 is located between the pressing plate 41 and the fixing plate 5. The pressing plate 41 defines an operating hole 44. The bottom end of the supporting rod 32 is fixedly connected to the moving plate 42 through the operating hole 44. The locking screw 43 passes through the pressing plate 41 and the fixing plate. 5 threaded connection. The locking screw 43 is loosened, and the movable plate 42 is movable between the pressing plate 41 and the fixed plate 5. The locking plate 43 is screwed to press the pressing plate 41 against the fixed plate 5. The locking screw 43 is also provided with a handle for easy operation. The opening area of the operation hole 44 is larger than the cross-sectional area of the support rod 32, so that the support rod 32 can move in the operation hole 44.

A mounting joint 7 is also provided at the bottom of the fixing plate 5 to facilitate mounting the jig on the test instrument.

By adopting the above-mentioned jig, by adjusting the angle of the chuck 1 and the angle adjusting mechanism 2, the height adjusting mechanism 3, and the horizontal adjusting mechanism 4, the adjustment of the workpiece to be tested clamped on the chuck 1 in the three-axis direction of the xyz is realized, that is, the omnidirectional adjustment To achieve the test of the firmness of the plurality of fixed claws and various types of fixed claws of the workpiece to be tested.

Some embodiments of the present invention are now further described by way of example with the claw pull test as follows. The claw pull test also requires a tensile test machine, a single hook, a three hooks (with a universal joint), a wedge-shaped tensile clamp, etc., and the workpiece to be tested is a S925 silver ring.

The exemplary operating conditions for the pawl pull test can be as shown in Table 1.

The tensile test data of the multi-piece S925 silver ring fixing claws using the omnidirectional adjustment jig of the present invention and the exemplary operating conditions described in Table 1 are shown in Table 2, wherein the force-deformation diagram of the sample 1 is shown in Fig. 4, The fixed jaws are measured in a certain order. The tensile test data of the multi-piece S925 silver ring fixing claws using the wedge-shaped drawing jig and according to the exemplary operating conditions described in Table 1 are shown in Table 3. The force-deformation diagram of the sample 6 is shown in Fig. 5, and the plurality of fixing claws are pressed. The measurement is performed in a certain order.

By comparing the above test data and the force value-deformation diagram, the conclusion obtained is that the angle adjustment mechanism of the new omnidirectional adjustment clamp adopts the angle of the claw and the main surface to accurately adjust the claw to be tested held by the chuck to the horizontal position. And the horizontal adjustment mechanism is used to make the direction of the force of the claws uniform. At the same time, the rotatable chuck enables each claw on the claw to be rotated to the same test position. Compared with the conventional clamp, the new model ensures the test data. Repeatability and stability, the resulting test data is scientific, accurate and reliable.

The above description is only some of the embodiments of the present invention, and although the present invention is further described for the purpose of illustration, it should be understood that the details are only for the purpose of illustration and the Example. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention.

Claims (10)

A clamp comprising a chuck (1), an angle adjusting mechanism (2) and a connecting mechanism, characterized in that the chuck (1) is arranged at an angle adjusting mechanism (2), and the angle adjusting mechanism (2) can be along The circumferential trajectory moves, the trailing end of the collet (1) is located on the circumferential trajectory, and the front end of the collet (1) is located at the center of the circumferential trajectory when the angle adjusting mechanism (2) is along the circumferential trajectory When moving, the moving distance is the same as the moving distance of the chuck (1), so that the angle adjustment of the two is also the same. A jig according to claim 1, characterized in that the collet (1) is rotatably disposed 360-degree at the tip end of the angle adjusting mechanism (2). The jig according to claim 2, characterized in that the top end of the angle adjusting mechanism (2) is provided with a first positioning member (6), and the first positioning member (6) is screwed to the collet (1) . The jig according to claim 3, characterized in that the angle adjusting mechanism (2) comprises an adjusting frame (21) and a second positioning member (22), and the adjusting frame (21) is provided with an arc groove (23) The second positioning member (22) is connected to the connecting mechanism through the arcuate groove (23), and the adjusting frame (21) is provided with an angular scale. A jig according to claim 1, characterized in that the collet (1) comprises a fourth positioning member (11) and two clips (12), the fourth positioning member (11) passing through a clip The piece (12) is threadedly coupled to the other clip (12). The jig according to claim 1, characterized in that One of the two clips (12) is provided with a sliding groove (13), and the other clamping piece (12) is provided with a guiding piece (14), and the guiding piece (14) is slidably engaged with the sliding groove (13). The jig according to any one of claims 1 to 6, characterized in that the connection mechanism comprises a height adjustment mechanism (3), a horizontal adjustment mechanism (4) and a fixing plate (5), the angle adjustment mechanism (2) The height adjustment mechanism (3) and the level adjustment mechanism (4) are sequentially coupled, and the horizontal adjustment mechanism (4) is disposed on the fixing plate (5). The jig according to claim 7, characterized in that the height adjustment mechanism (3) comprises a sleeve (31), a support rod (32) and a third positioning member (33), the sleeve (31) sleeve Provided on the support rod (32), the sleeve (31) is provided with a vertical groove (34), and the third positioning member (33) is connected to the support rod (32) through the vertical groove (34). The jig according to claim 8, characterized in that the horizontal adjustment mechanism (4) comprises a pressure plate (41), a movable plate (42) and a locking screw (43), and the movable plate (42) is located at the pressure plate ( 41) between the fixing plate (5), the pressing plate (41) is provided with an operating hole (44), and the bottom end of the supporting rod (32) is fixedly connected to the moving plate (42) through the operating hole (44) The locking screw (43) is screwed to the fixing plate (5) through the pressure plate (41). The jig according to claim 9, wherein the operation hole (44) has an opening area larger than a cross-sectional area of the support rod (32), so that the support rod (32) can move in the operation hole (44). .