Installation jig

Abstract

The present invention belongs to the field of mechanical processing, and provides a clamping fixture, including a base, a positioning pin fixed on the top surface of the base for passing through a through hole of the workpiece itself, a receiving groove provided on the bottom surface of the base, a positioning column fixed on the top surface of the base for abutting against the outer periphery of the workpiece, and a clamping mechanism provided in the receiving groove and extending above the top surface of the base for abutting against the opposite side surfaces of the workpiece and clamping the workpiece in the middle of the base. The workpiece is pre-positioned by the positioning pin and the positioning column; in addition, by adding a clamping mechanism, the clamping mechanism is accommodated in the receiving groove provided in the bottom surface of the base and extends above the top surface of the base, and the workpiece is clamped in the middle position of the top surface of the base from opposite sides of the workpiece to achieve final positioning and clamping; while greatly reducing the machining accuracy requirements for the positioning pin and the workpiece itself and meeting the clamping accuracy requirements, the clamping reliability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and more specifically, relates to a clamping fixture. Background Art

[0002] When we need to weld or perform other types of processing on a workpiece, accurately and stably positioning the workpiece to be processed at the correct workstation is the basis and key to reducing processing errors and ensuring processing quality.

[0003] A common positioning method is to develop a clamping fixture with locating pins corresponding to the hole positions based on the hole positions of the workpiece itself. Since the clamping fixture relies solely on multiple locating pins for positioning, it is highly dependent on the machining accuracy of each locating pin and the hole positions of the workpiece itself. Once there is a large error in the size or setting position of the locating pin, or the workpiece itself has a large error in the hole position accuracy corresponding to the locating pin, the positioning accuracy of the clamping fixture will be affected, resulting in a high defective rate of the workpiece, greatly affecting production efficiency, and it is impossible to guarantee the quality of the workpiece. Summary of the invention

[0004] The object of the present invention is to provide a clamping fixture to solve the technical problem in the prior art that the clamping fixture has too high requirements on the hole position accuracy of the locating pin and the workpiece itself, resulting in a high defective rate of the workpiece.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a clamping fixture, including a base, and a positioning pin fixedly arranged on the top surface of the base and used to pass through a through hole of the workpiece itself, the bottom surface of the base is provided with a receiving groove, the clamping fixture also includes a positioning column fixedly arranged on the top surface of the base and used to abut against the outer periphery of the workpiece, and a clamping mechanism arranged in the receiving groove and extending above the top surface of the base and used to abut against the opposite side surfaces of the workpiece and clamp the workpiece to the middle of the base.

[0006] Furthermore, the clamping mechanism includes a rotating shaft fixed in the accommodating groove, a rotating rod movably mounted on the outer circumference of the rotating shaft, two clamping units rotatably connected to the opposite ends of the rotating rod and extending to the top surface of the base for abutting against the opposite side surfaces of the workpiece and clamping the workpiece in the middle of the base, a push rod rotatably connected to the rotating rod and located between the two clamping units for driving the rotating rod to rotate around the rotating shaft, and a spring with one end abutting against the base and the other end abutting against one end of the push rod for driving the push rod to reset.

[0007] Furthermore, the base is provided with a first positioning groove extending along the normal expansion and contraction direction of the spring and opposite to the other end of the spring, and a second positioning groove extending along the normal expansion and contraction direction of the spring and opposite to the first positioning groove. The first positioning groove and the second positioning groove are respectively connected to the opposite ends of the accommodating groove, and the push rod is slidably accommodated in the second positioning groove. One end of the push rod extends into the first positioning groove and abuts against the other end of the spring, and the other end of the push rod extends out of the second positioning groove.

[0008] Furthermore, the base is provided with a receiving hole extending along a normal expansion and contraction direction of the spring and facing the first positioning groove, and the spring is received in the receiving hole.

[0009] Furthermore, the clamping unit includes a connecting rod with one end rotatably connected to the rotating rod, a fixing column fixed in the accommodating groove, and a clamping block connected to the other end of the connecting rod and extending to the top of the base. A sliding groove is provided on the connecting rod, and the fixing column is movably inserted into the sliding groove and forms a sliding abutment with the connecting rod.

[0010] Furthermore, the clamping block includes a base, and a clamping portion connected to the base and extending from the base toward the middle of the base, and the clamping portion has an arc-shaped surface for directly contacting the workpiece.

[0011] Furthermore, the clamping mechanism also includes an abutting column fixed in the accommodating groove, and the abutting column and the rotating shaft are respectively located on opposite sides of the push rod and are used to prevent the rotating rod from hitting the base.

[0012] Furthermore, two avoidance grooves are respectively formed on two opposite side surfaces of the base, and both avoidance grooves are connected to the accommodating groove to prevent the connecting rod and the clamping block from colliding with the base.

[0013] Furthermore, two gripping grooves are formed on two opposite side surfaces of the base, and the distance between the two gripping grooves is smaller than the length of the workpiece along the distance direction between the two gripping grooves.

[0014] Furthermore, the clamping fixture also includes a cover plate which is covered on the receiving groove and fixedly connected to the bottom surface of the base.

[0015] The beneficial effects of the clamping fixture provided by the present invention are as follows: compared with the prior art, the clamping fixture of the present invention realizes pre-positioning of the workpiece by passing the positioning pin through the through-hole of the workpiece itself and abutting against the outer periphery of the workpiece through the positioning column; in addition, by adding a clamping mechanism, the clamping mechanism is accommodated in a receiving groove opened on the bottom surface of the base and extends to the top surface of the base, and the workpiece is clamped at the middle position of the top surface of the base from opposite sides of the workpiece to achieve final positioning and clamping; while greatly reducing the processing accuracy requirements for the positioning pin and the workpiece itself and meeting the clamping accuracy requirements, the clamping reliability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 Schematic diagram of the exploded structure of the clamping fixture provided in the embodiment of the present invention Figure 1 ;

[0018] Figure 2 Schematic diagram of the exploded structure of the clamping fixture provided in the embodiment of the present invention Figure 2 ;

[0019] Figure 3 Schematic diagram of the assembly structure of the clamping fixture provided in the embodiment of the present invention Figure 1 ;

[0020] Figure 4 Schematic diagram of the assembly structure of the clamping fixture provided in the embodiment of the present invention Figure 2 ;

[0021] Among them, the reference numerals in the figure are:

[0022] 10. Base; 20. Positioning pin; 30. Positioning column; 40. Clamping mechanism; W. workpiece; W1. Through hole; H1. Accommodating groove; 31. First column; 32. Second column; 41. Rotating shaft; 42. Rotating rod; 43. Clamping unit; 44. Push rod; 421. First through hole; 11. Insertion hole; 441. Second through hole; 442. Third through hole; 422. Fourth through hole; L1. First connecting pin; H2. First positioning groove; H3. Second positioning groove; H4. Accommodating hole; 431. Connecting rod; 4311. Slide groove; 432. Fixed column; 433. Clamping block; L2. Second connecting pin; 4331. Base; 4332. Clamping part; S. Arc surface; 45. Top column; H5. Avoidance groove; H6. Handle groove; 50. Cover plate. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] Please also read Figures 1 to 3Now, the clamping fixture provided by the present invention is described. The clamping fixture includes a base 10, and a positioning pin 20 fixed on the top surface of the base 10 for passing through the through hole W1 of the workpiece W itself, and the bottom surface of the base 10 is provided with a receiving groove H1. The clamping fixture also includes a positioning column 30 fixed on the top surface of the base 10 for abutting against the outer periphery of the workpiece W, and a clamping mechanism 40 provided in the receiving groove H1 and extending above the top surface of the base 10 for abutting against the opposite sides of the workpiece W and clamping the workpiece W in the middle of the base 10. Specifically, the clamping fixture is used to clamp the workpiece W on the top surface of the base 10. A positioning pin 20 is provided on the top surface of the base 10. The positioning pin 20 extends upward from the top surface of the base 10 in the vertical direction, so that it can be easily inserted into the through hole W1 of the workpiece W. The specific size and setting position should depend on the aperture size and position of the through hole W1 of the workpiece W to be clamped. For example, in this embodiment, the workpiece W is the back shell of a mobile phone, and the setting position of the positioning pin 20 is opposite to the camera hole on the back shell of the mobile phone, and the aperture is adapted to the camera hole; a positioning column 30 is also provided on the top surface of the base 10. In this embodiment, the positioning column 30 extends from the base The top surface of the base 10 extends upward in the vertical direction, including two first columns 31 for respectively pressing against the two width edges of the workpiece W, and two second columns 32 for respectively pressing against the two length edges of the workpiece W, and the first column 31 and the second column 32 are both cylindrical, so that the square column-shaped positioning column 30 with edges and corners relative to the peripheral surface can effectively avoid scratching the workpiece W; in addition, the clamping fixture provided by the present invention also includes a clamping mechanism 40, which is accommodated in the receiving groove H1 opened on the bottom surface of the base 10, and extends to the top surface of the base 10, clamping the workpiece W at the middle position of the top surface of the base 10 from the opposite sides of the workpiece W. Thus, the pre-positioning of the workpiece W is achieved by the positioning pin 20 and the positioning column 30, and the final positioning and clamping are achieved by the clamping mechanism 40, which greatly reduces the processing accuracy requirements of the positioning pin 20 and the workpiece W itself, and also meets the clamping accuracy requirements, while improving the clamping reliability.

[0028] Compared with the prior art, the clamping fixture provided by the present invention includes a clamping mechanism 40, which is accommodated in a receiving groove H1 opened on the bottom surface of the base 10 and extends above the top surface of the base 10, clamping the workpiece W at the middle position of the top surface of the base 10 from opposite sides of the workpiece W; in this way, pre-positioning is achieved by the locating pin 20 and the locating column 30, and final positioning and clamping are achieved by the clamping mechanism 40, which greatly reduces the processing accuracy requirements for the locating pin 20 and the workpiece W itself and meets the clamping accuracy requirements, while improving the clamping reliability.

[0029] The clamping fixture provided by the present invention is particularly used for clamping a mobile phone housing to be processed in a metal welding process.

[0030] Please also refer to Figures 1 to 3 As a specific embodiment of the clamping fixture provided by the present invention, the clamping mechanism 40 includes a rotating shaft 41 fixed in the accommodating groove H1, a rotating rod 42 movably sleeved on the outer periphery of the rotating shaft 41, two clamping units 43 rotatably connected to the opposite ends of the rotating rod 42 and extending to the top surface of the base 10 for abutting against the opposite side surfaces of the workpiece W and clamping the workpiece W in the middle of the base 10, a push rod 44 rotatably connected to the rotating rod 42 and located between the two clamping units 43 for driving the rotating rod 42 to rotate around the rotating shaft 41, and a spring (not shown in the figure) with one end abutting against the base 10 and the other end abutting against one end of the push rod 44 for driving the push rod 44 to return to its original position. Here, a first through hole 421 is provided in the middle of the rotating rod 42, which is opposite to the insertion hole 11 provided in the middle of the bottom surface of the base 10. The rotating shaft 41 is movably inserted into the first through hole 421 and fixedly inserted into the insertion hole 11, so that the rotating rod 42 can flexibly rotate around the rotating shaft 41. Of course, components such as bearings and movable sleeves can be added between the two, which is not the only limitation here; a second through hole 441 is provided on the push rod 44 for the rotating rod 42 to pass through, and a third through hole 442 connected to the second through hole 441 is provided on the upper and lower sides of the second through hole 441. A fourth through hole 422 is provided on the rotating rod 42, which is opposite to the third through hole 442 and located on one side of the first through hole 421, and the first connecting pin L1 is movably inserted through The rotating rod 42 and the push rod 44 are movably hinged in the third through hole 442 and the two second through holes 441; the two clamping units 43 are also hinged at the opposite ends of the rotating rod 42; in this way, the user pushes the push rod 44 to move in the direction of the compression spring, driving the rotating rod 42 to rotate around the rotating shaft 41 in the accommodating groove H1, thereby driving the two clamping units 43 to move in opposite directions, thereby increasing the distance between each other. At this time, the user puts the workpiece W between the two clamping units 43, and passes the positioning pin 20 through the through hole W1, so that the positioning column 30 presses against the four sides of the workpiece W. At this time, the push rod 44 is released, and the push rod 44 moves in the opposite direction under the action of the spring, so that the distance between the two clamping units 43 becomes smaller, thereby positioning and clamping the workpiece W. Here, since the rotating shaft 41 is arranged at the middle position in the width direction of the base 10, the first through hole 421 is arranged at the middle position of the rotating rod 42, and the two clamping units 43 are distributed symmetrically with respect to the rotating shaft 41, when the two clamping units 43 clamp the workpiece W from both sides, the forces on both sides of the workpiece W are balanced, and the workpiece W can be finally clamped in the middle position in the width direction of the base 10.

[0031] Please also refer to Figure 1 to Figure 2As a specific embodiment of the clamping fixture provided by the present invention, a first positioning groove H2 extending along the normal expansion and contraction direction of the spring and facing the other end of the spring, and a second positioning groove H3 extending along the normal expansion and contraction direction of the spring and facing the first positioning groove H2 are opened on the base 10. The first positioning groove H2 and the second positioning groove H3 are respectively connected to the opposite ends of the accommodating groove H1, and the push rod 44 is slidably accommodated in the second positioning groove H3. One end of the push rod 44 extends into the first positioning groove H2 and abuts against the other end of the spring, and the other end of the push rod 44 extends out of the second positioning groove H3. Here, the first positioning groove H2 and the second positioning groove H3 both extend along the normal expansion and contraction direction of the spring, and the second positioning groove H3 extends to the edge of the base 10. The cross-sectional dimensions of the first positioning groove H2 and the second positioning groove H3 are the same and the two are directly opposite to each other, that is, the first positioning groove H2 is combined with the second positioning groove H3 and the accommodating groove H1 to form a roughly cross shape. The push rod 44 spans the accommodating groove H1 and is respectively accommodated in the first positioning groove H2 and the second positioning groove H3. One end of the push rod 44 abuts against the other end of the spring, and the other end of the push rod 44 extends out of the second positioning groove H3, that is, extends out of the edge of the base 10. In this way, it is convenient for the user to push the push rod 44 to compress the spring. Here, the first positioning groove H2 and the second positioning groove H3 are not only used to accommodate the push rod 44, but also to ensure that the push rod 44 can slide along the normal expansion and contraction direction of the spring.

[0032] For further information, see Figure 2 As a specific embodiment of the clamping fixture provided by the present invention, a receiving hole H4 extending along the normal expansion and contraction direction of the spring and directly opposite to the first positioning groove H2 is provided on the base 10, and the spring is received in the receiving hole H4. In this embodiment, the receiving hole H4 is cylindrical, and its axis extends along the normal expansion and contraction direction of the spring. One end of the spring is received in the receiving hole H4 and abuts against the base 10 forming the bottom surface of the receiving hole H4, and the diameter of the receiving hole H4 and the depth along its axis direction should ensure that the spring does not tilt during the expansion and contraction process.

[0033] Please also refer to Figure 1 to Figure 2As a specific embodiment of the clamping fixture provided by the present invention, the clamping unit 43 includes a connecting rod 431 with one end rotatably connected to the rotating rod 42, a fixing column 432 fixed in the accommodating groove H1, and a clamping block 433 connected to the other end of the connecting rod 431 and extending to the top of the base 10. The connecting rod 431 is provided with a sliding groove 4311, and the fixing column 432 is movably inserted into the sliding groove 4311 and forms a sliding abutment with the connecting rod 431. Here, one end of the connecting rod 431 included in the clamping unit 43 is hinged to the end of the rotating rod 42 through the second connecting pin L2, and a sliding groove 4311 extending along the length direction of the connecting rod 431 is opened on the connecting rod 431, and the sliding groove 4311 allows the fixing column 432 fixedly protruding in the accommodating groove H1 to be movably inserted therein, so that when the user presses the push rod 44, the push rod 44 drives the rotating rod 42 to rotate around the rotating shaft 41, and the two ends of the rotating rod 42 move in opposite directions, thereby driving one end of the connecting rod 431 to move accordingly. Since the connecting rod 431 is movably sleeved on the outer periphery of the fixing column 432, that is, the fixing column 432 is inserted in the sliding groove 4311, in this embodiment, the sliding groove 4311 is strip-shaped. , and extends along the length direction of the connecting rod 431. Therefore, the connecting rod 431 at the other end of the rotating rod 42 will move in the direction away from the rotating shaft 41 under the pushing action of the rotating rod 42 and the supporting action of the fixed column 432, thereby driving the clamping block 433 bent and connected to the other end of the connecting rod 431 to move in the direction away from the rotating shaft 41. As a result, the distance between the two clamping blocks 433 of the two clamping units 43 becomes larger, and the workpiece W can be placed between the two clamping blocks 433; when the user releases the push rod 44, the push rod 44 retreats under the action of the rebound force of the spring, driving the rotating rod 42 to rotate in the opposite direction, and the connecting rod 431 and the clamping block 433 make the opposite movement to the above, so that the clamping block 433 clamps the two sides of the workpiece W.

[0034] Please also refer to Figure 1 to Figure 2 As a specific embodiment of the clamping fixture provided by the present invention, the clamping block 433 includes a base 4331, and a clamping portion 4332 connected to the base 4331 and extending from the base 4331 to the middle of the base, and the clamping portion 4332 has an arc surface S for direct contact with the workpiece W. Specifically, in this embodiment, the clamping portion 4332 is semi-cylindrical, and its cylindrical surface, that is, the arc surface S in this embodiment, faces the middle of the base, that is, the two cylindrical surfaces of the two clamping portions 4332 face each other, and are used for direct contact with the workpiece W, thereby avoiding large friction between the clamping block 433 and the workpiece W, which in turn causes scratches and other undesirable phenomena.

[0035] Please also refer to Figure 1 to Figure 2As a specific embodiment of the clamping fixture provided by the present invention, the clamping mechanism 40 also includes a push-up column 45 fixed in the receiving groove H1, and the push-up column 45 and the rotating shaft 41 are respectively located on opposite sides of the push rod 44 to prevent the rotating rod 42 from hitting the base 10. When the user presses the push rod 44, the push rod 44 drives the rotating rod 42 to rotate around the rotating shaft 41. Since the push-up column 45 and the rotating shaft 41 are respectively located on opposite sides of the push rod 44, and the push-up column 45 is arranged in the receiving groove H1 and is located in the forward direction of the rotating rod 42, the rotating rod 42 is driven by the push rod 44 to rotate forward to a certain extent and then is stopped by the push-up column 45 from continuing to move forward, thereby preventing the rotating rod 42 from colliding with the base 10, as well as the noise and possible damage caused by the collision.

[0036] Please also refer to Figures 2 to 4 As a specific embodiment of the clamping fixture provided by the present invention, two avoidance grooves H5 are respectively opened on the two opposite side surfaces of the base 10, and the two avoidance grooves H5 are connected to the accommodating groove H1 to prevent the connecting rod 431 and the clamping block 433 from colliding with the base 10. Here, the two avoidance grooves H5 are wedge-shaped, and the extension direction of the wedge-shaped surface is adapted to the movement direction of the adjacent connecting rod 431. The shape and size of the avoidance grooves H5 are not limited here, so as to ensure that the connecting rod 431 and the base 10 do not interfere with each other.

[0037] Please also refer to Figures 1 to 4 As a specific embodiment of the clamping fixture provided by the present invention, two hand grooves H6 are further provided on the two opposite sides of the base 10, and the distance between the two hand grooves H6 is less than the length of the workpiece W along the distance direction of the two hand grooves H6. Specifically, the two hand grooves H6 are arranged on the opposite sides of the base 10 and face each other, and the distance between the two should be less than the length of the workpiece W along the distance direction between the two. In this embodiment, the distance between the two should be less than the width of the mobile phone back shell, so that a part of the two opposite sides of the mobile phone back shell along the width direction can face the hand grooves H6, and the user can hold the mobile phone back shell at the part facing the hand grooves H6 to place the mobile phone back shell in the predetermined position of the clamping fixture, and remove the mobile phone back shell from the clamping fixture, avoiding possible scratches and collisions, which is very convenient.

[0038] For further information, see Figure 4 As a specific embodiment of the clamping fixture provided by the present invention, the clamping fixture also includes a cover plate 50 that is covered on the receiving groove H1 and fixedly connected to the bottom surface of the base 10. The cover plate 50 is screwed to the bottom surface of the base 10, and its main function is to cover the clamping mechanism 40 so that the clamping mechanism 40 is not interfered by external components during movement, and it also plays a certain dust-proof role.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping fixture, comprising a base, and a positioning pin fixed on the top surface of the base and used to pass through a through hole of a workpiece, characterized in that: The bottom surface of the base is provided with a receiving groove, and the clamping fixture further comprises a positioning column fixedly arranged on the top surface of the base for abutting against the outer periphery of the workpiece, and a clamping mechanism arranged in the receiving groove and extending above the top surface of the base for abutting against two opposite side surfaces of the workpiece and clamping the workpiece in the middle of the base; The clamping mechanism includes a rotating shaft fixed in the accommodating groove, a rotating rod movably sleeved on the outer periphery of the rotating shaft, two clamping units rotatably connected to opposite ends of the rotating rod and extending above the top surface of the base for abutting against opposite side surfaces of the workpiece and clamping the workpiece to the middle of the base, a push rod rotatably connected to the rotating rod and located between the two clamping units for driving the rotating rod to rotate around the rotating shaft, and a spring with one end abutting against the base and the other end abutting against one end of the push rod for driving the push rod to return to its original position; The base is provided with a first positioning groove extending along the normal expansion and contraction direction of the spring and facing the other end of the spring, and a second positioning groove extending along the normal expansion and contraction direction of the spring and facing the first positioning groove, the first positioning groove and the second positioning groove are respectively connected to the opposite ends of the accommodating groove, the push rod is slidably accommodated in the second positioning groove, one end of the push rod extends into the first positioning groove and abuts against the other end of the spring, and the other end of the push rod extends out of the second positioning groove; The base is provided with a receiving hole extending along the normal expansion and contraction direction of the spring and facing the first positioning groove, and the spring is received in the receiving hole; The clamping unit includes a connecting rod with one end rotatably connected to the rotating rod, a fixing column fixed in the accommodating groove, and a clamping block connected to the other end of the connecting rod and extending to the top of the base. A sliding groove is provided on the connecting rod, and the fixing column is movably inserted into the sliding groove and forms a sliding abutment with the connecting rod.

2. The clamping fixture according to claim 1, characterized in that: The clamping block comprises a base, and a clamping portion connected to the base and extending from the base toward the middle of the base, wherein the clamping portion has an arc surface for directly contacting a workpiece.

3. The clamping fixture according to claim 1, characterized in that: The clamping mechanism further comprises an abutting column fixed in the accommodating groove, wherein the abutting column and the rotating shaft are respectively located on opposite sides of the push rod and are used to prevent the rotating rod from hitting the base.

4. The clamping fixture according to claim 1, characterized in that: Two avoidance grooves are respectively formed on two opposite side surfaces of the base, and both avoidance grooves are connected to the accommodating groove to prevent the connecting rod and the clamping block from colliding with the base.

5. The clamping fixture according to any one of claims 1 to 4, characterized in that: Two hand-gripping grooves are also formed on two opposite side surfaces of the base, and the distance between the two hand-gripping grooves is smaller than the length of the workpiece along the distance direction between the two hand-gripping grooves.

6. The clamping fixture according to any one of claims 1 to 4, characterized in that: The clamping fixture also includes a cover plate which is covered on the containing groove and fixedly connected to the bottom surface of the base.

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