CN112894410B

CN112894410B - Clamp for broaching two small holes of lifting lug

Info

Publication number: CN112894410B
Application number: CN202110117953.6A
Authority: CN
Inventors: 冯纪良; 陈玉文
Original assignee: Changzhou Vocational Institute of Mechatronic Technology
Current assignee: Changzhou Vocational Institute of Mechatronic Technology
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2022-07-01
Anticipated expiration: 2041-01-28
Also published as: CN112894410A

Abstract

The invention discloses a clamp for broaching two small holes of a lifting lug, which comprises a clamp body, a trapezoidal supporting block, a positioning sleeve, a pre-positioning device, a wedge block combination mechanism and a manual adjusting mechanism, wherein the trapezoidal supporting block is arranged on the clamp body; the trapezoidal supporting block is arranged at one end of the front side of the fixture body; the positioning sleeve is of a central through hole structure and is arranged at the central position of the clamp body in a penetrating manner; the pre-positioning device comprises a pre-positioning pin for positioning the end face of the large hole of the workpiece, a pre-positioning supporting screw for positioning the bottom end face of the workpiece lifting lug and a support; the wedge block combination mechanism is arranged on the trapezoidal supporting block and is of a central through hole structure; the wedge block combined mechanism can expand between two inner side surfaces of the workpiece lifting lug so as to be tightly attached to the end surfaces of the two inner side surfaces of the workpiece lifting lug; and the manual adjusting mechanism is used for controlling the expansion and contraction of the wedge block combination mechanism. The invention can prevent the deformation of the workpiece when the automobile lifting lug part broachs two small holes, and well ensure the dimensional accuracy and the coaxiality accuracy of the two small holes.

Description

Clamp for broaching two small holes of lifting lug

Technical Field

The invention relates to the technical field of machining broaching machine fixtures, in particular to a fixture for broaching two small holes of a lifting lug.

Background

At present, in the prior art, when the automobile rear steel plate spring lifting lug part is used, lifting lugs at two ends of the part are generally connected to a bracket of a frame through pin hinges, and the main function of the part is loading, so that a rear steel plate can be extended, and the normal buffering function is exerted. When the spring lifting lug parts are produced in batches, the blank is generally formed by die forging so as to ensure that metal fibers are not cut off as much as possible, thereby keeping certain toughness and ensuring the requirements of strength and rigidity during working. In order to obtain good use performance, high technical requirements are generally required to be established when the shackle component is machined.

The machining process of the lifting lug part comprises the working procedures of rough milling of two end faces of a large hole, drilling and reaming of the large hole, finish milling of the two end faces of the large hole, milling of two small hole end faces (four end faces, namely the inner side and the outer side), broaching of the two small holes and the like, and each working procedure has high technical requirements for ensuring the working precision and the service performance of the automobile. Particularly, when two small holes are broached, a broaching machine tool is adopted for processing, but because the end face size of each workpiece has a certain error, the workpiece is easy to deform when the existing clamp is matched with the two small holes of the broaching lug, the precision of the two small holes of the broaching is not high enough, the coaxiality error of the two small holes is large, the integral processing yield is not high, and further the working precision, the service performance and the service life of the automobile are influenced.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a clamp for broaching two small holes of a lifting lug, which can prevent a workpiece from deforming when the two small holes are broached and well ensure the dimensional accuracy and the coaxiality accuracy of the two small holes.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a clamp for broaching two small holes of a lifting lug comprises a clamp body, a trapezoidal supporting block, a positioning sleeve, a pre-positioning device, a wedge block combination mechanism and a manual adjusting mechanism; the trapezoidal supporting block is arranged at one end of the front side of the fixture body; the positioning sleeve is of a central through hole structure and is arranged at the central position of the clamp body in a penetrating manner, and the positioning sleeve is used for positioning the outer side end face of the workpiece lifting lug; the pre-positioning device comprises a pre-positioning pin for positioning the end of the large hole of the workpiece, a pre-positioning supporting screw for positioning the bottom end face of the lifting lug of the workpiece and a support, the pre-positioning pin is arranged at one end, far away from the trapezoidal supporting block, of the front side of the fixture body, the support is arranged at the front side of the fixture body and is positioned below the positioning sleeve, and the pre-positioning supporting screw is adjustably connected to the support; the wedge block combination mechanism is arranged on the trapezoidal support block, the wedge block combination mechanism is of a central through hole structure, the central through hole of the wedge block combination mechanism and the central through hole of the positioning sleeve are coaxial, and the wedge block combination mechanism can expand between two inner side surfaces of the workpiece lifting lug so as to be tightly attached to the two inner side end surfaces of the workpiece lifting lug; and the manual adjusting mechanism is used for controlling the expansion and contraction of the wedge block combination mechanism.

Further, the wedge block combination mechanism comprises a main wedge block, a first wedge block and a second wedge block; the main wedge block is slidably clamped on the trapezoidal supporting block, the first wedge block is slidably clamped on the front side of the main wedge block, and the second wedge block is slidably clamped on the rear side of the main wedge block; the manual adjusting mechanism can control the main wedge block to move up and down, the first wedge block and the second wedge block can simultaneously move and expand towards the respective outer sides when the main wedge block moves down, and the first wedge block and the second wedge block can simultaneously move and contract towards the respective inner sides when the main wedge block moves up; the first wedge block and the second wedge block are both of a central through hole structure and are coaxial with the central through hole of the positioning sleeve, a rectangular through hole is formed in the center of the main wedge block, and the rectangular through hole can cover the central through holes of the first wedge block and the second wedge block within a certain range.

Furthermore, a T-shaped straight clamping groove is formed in one side of the trapezoidal support block from bottom to top, a T-shaped straight bayonet is formed in one side, close to the trapezoidal support block, of the main wedge block from bottom to top, and the main wedge block is slidably clamped in the T-shaped straight clamping groove of the trapezoidal support block through the T-shaped straight bayonet; the front side and the rear side of the main wedge block are both provided with T-shaped inclined clamping grooves from bottom to top, the tops of the two T-shaped inclined clamping grooves are respectively inclined towards the front side and the rear side, T-shaped inclined bayonets from bottom to top are formed on the rear side of the first wedge block and the front side of the second wedge block, the first wedge block is slidably clamped in the T-shaped inclined clamping grooves on the front side of the main wedge block through the T-shaped inclined bayonet on the rear side, and the second wedge block is slidably clamped in the T-shaped inclined clamping grooves on the rear side of the main wedge block through the T-shaped inclined bayonet on the front side; the side, close to the main wedge block, of the trapezoidal support block is also provided with a front guide key and a rear guide key, the edges of one sides, close to the trapezoidal support block, of the first wedge block and the second wedge block are respectively provided with a guide groove, and the first wedge block and the second wedge block are respectively connected to the guide keys in a sliding and clamping mode through the corresponding guide grooves; the main wedge block is also provided with avoidance holes, and the avoidance holes can avoid the guide keys within a certain range; the first wedge and the second wedge may be simultaneously moved and expanded toward respective outer sides along the guide key when the main wedge is moved downward, and may be simultaneously moved and contracted toward respective inner sides along the guide key when the main wedge is moved upward.

Furthermore, a positioning groove is formed in one side, close to the main wedge block, of the trapezoidal supporting block, and the guide key is fixedly connected into the positioning groove.

Further, manual adjustment mechanism includes pivot, driving lever and the oblique handle of button head, the pivot is rotated and is connected on the anchor clamps body and be located trapezoidal supporting shoe top, driving lever fixed connection is at the pivot middle part, the oblique handle fixed connection of button head is at the outer tip of pivot, and manual the oblique handle of button head of pulling can drive the driving lever and rotate, and the driving lever can drive main chock and reciprocate.

Further, a cylindrical shifting block is arranged at one end of the shifting rod, a shifting groove is formed in the edge of the upper portion of the main wedge block, the cylindrical shifting block is movably clamped with the shifting groove, and the diameter of the cylindrical shifting block is equal to the width of the shifting groove.

Furthermore, the deflector rod is sleeved in the middle of the rotating shaft and fixedly clamped with the rotating shaft through a pin key, and the head of the round-head inclined handle is sleeved at the outer end of the rotating shaft and fixedly clamped with the rotating shaft through a clamping pin.

Furthermore, an elastic check ring is further arranged between the shifting rod and the clamp body, and the elastic check ring is sleeved on the rotating shaft.

Further, the trapezoidal supporting block and the clamp body are integrally formed.

By adopting the technical scheme, the invention has the following beneficial effects:

1. according to the invention, the expansion of the wedge block combination mechanism between the two inner side surfaces of the workpiece lifting lug is controlled through the manual adjusting mechanism, so that the wedge block combination mechanism is tightly attached to the two inner side end surfaces of the workpiece lifting lug to prevent the workpiece from deforming when two small holes are broached. The main wedge block is matched with the trapezoidal supporting block in a sliding clamping mode, the main wedge block is matched with the first wedge block in an inclined plane sliding clamping mode, the limiting guide of the guide key is added, the main wedge block can drive the first wedge block and the second wedge block to expand and contract to move when moving up and down, then two inner side end faces of a workpiece lifting lug can be attached tightly, workpiece deformation in the broaching process is effectively prevented, the size precision and the coaxiality precision of two small holes are well guaranteed, the processing yield is further improved, the working precision of an automobile is guaranteed, and the service performance and the service life of the automobile are prolonged.

2. Through the cylindric shifting block of driving lever and the activity joint of dialling the groove, cylindric shifting block diameter equals the design of dialling the groove width for labour saving and smoothness more when adjusting is pulled to the button head angle handle manually, and adjusts the precision higher, and then makes first voussoir and second voussoir remove to both sides and paste the controllability when tight higher, the difficult error that appears.

Drawings

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is an exploded view of the overall structure of the present invention;

FIG. 3 is a front view of the present invention;

FIG. 4 is a schematic top view of the present invention;

FIG. 5 is a schematic left side cross-sectional view of the present invention;

FIG. 6 is an exploded and enlarged view of the wedge assembly mechanism of the present invention;

FIG. 7 is an enlarged schematic view of a trapezoidal support block of the present invention;

FIG. 8 is an enlarged schematic view of the manual adjustment mechanism of the present invention;

FIG. 9 is a perspective view of a first shackle component of the exemplary embodiment;

FIG. 10 is a perspective view showing an operation state of the present invention in the embodiment;

FIG. 11 is a plan view showing an operation state of the present invention in the embodiment;

wherein, 1, the fixture body; 2. a trapezoidal support block; 3. a positioning sleeve; 4. pre-positioning pins; 5. pre-positioning the support screw; 6. a support; 7. a wedge block combination mechanism; 8. a manual adjustment mechanism; 70. a main wedge block; 71. a first wedge; 72. a second wedge; 703. a rectangular perforation; 200, T-shaped straight clamping grooves; 700, T-shaped straight bayonet; 701, a T-shaped oblique clamping groove; a T-shaped inclined bayonet 710; 20. a guide key; 720. a guide groove; 702. avoiding holes; 202. positioning a groove; 80. a rotating shaft; 81. a deflector rod; 82. a rounded nose beveled handle; 810. a cylindrical shifting block; 704. a groove is poked; 83. a pin key; 84. a bayonet lock; 85. a circlip; 900. and a first lifting lug part.

Detailed Description

In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

As shown in fig. 1 to 11, taking the machining of the first shackle component 900 as an example, when broaching two phi 30mm small holes of the shackle of the first shackle component 900, the process precision requires that the size precision of the phi 30mm hole is (0 to +0.045mm), the coaxiality requirement, that is, the coaxiality tolerance of the two phi 30mm small holes is phi 0.01mm, and the machining error is large when the conventional fixture is matched.

Therefore, the present embodiment provides a clamp for broaching two small holes of a lifting lug, which is composed of a clamp body 1, a trapezoidal support block 2, a positioning sleeve 3, a pre-positioning device, a wedge block combination mechanism 7 and a manual adjusting mechanism 8, wherein the trapezoidal support block 2 is arranged at one end of the front side of the clamp body 1; the positioning sleeve 3 is of a central through hole structure and is arranged at the central position of the clamp body 1 in a penetrating manner, and the positioning sleeve 3 is used for positioning the outer side end face of a 900 lifting lug of the lifting lug part; the pre-positioning device comprises a pre-positioning pin 4 for positioning the big hole end of the first 900 lifting lug part, a pre-positioning supporting screw 5 for positioning the bottom end face of the first 900 lifting lug part and a support 6, the pre-positioning pin 4 is fixedly connected to one end, far away from the trapezoidal supporting block 2, of the front side of the clamp body 1 through a screw, the support 6 is arranged on the front side of the clamp body 1 and located below the positioning sleeve 3, and the pre-positioning supporting screw 5 is adjustably connected to the support 6 through a nut; the wedge block combination mechanism 7 is arranged on the trapezoidal support block 2, so that in order to facilitate smooth broaching, the wedge block combination mechanism 7 is also of a central through hole structure, the central through hole of the wedge block combination mechanism 7 is coaxial with the central through hole of the positioning sleeve 3, and the wedge block combination mechanism 7 can expand between two inner side surfaces of a first 900 lifting lug of a first lifting lug part so as to be tightly attached to the end surfaces of two inner sides of the first 900 lifting lug of the first lifting lug part; the manual adjusting mechanism 8 is used for controlling the expansion and contraction of the wedge block combination mechanism 7. According to the embodiment, the wedge block combination mechanism 7 is controlled to expand between two inner side surfaces of the first lifting lug part 900 through the manual adjusting mechanism 8, so that the two inner side end surfaces of the first lifting lug part 900 are tightly attached to prevent the deformation of a workpiece during broaching of two small holes, the size precision and the coaxiality precision of the two small holes are well guaranteed, the processing yield is further improved, and the working precision, the service performance and the service life of an automobile are guaranteed.

Specifically, the wedge combination mechanism 7 in the present embodiment is constituted by a main wedge 70, a first wedge 71, and a second wedge 72; the main wedge block 70 is clamped on the trapezoidal supporting block 2 in a sliding manner, the first wedge block 71 is clamped on the front side of the main wedge block 70 in a sliding manner, and the second wedge block 72 is clamped on the rear side of the main wedge block 70 in a sliding manner; the manual adjusting mechanism 8 can control the main wedge block 70 to move up and down, the first wedge block 71 and the second wedge block 72 can simultaneously move and expand towards the respective outer sides when the main wedge block 70 moves down, and the first wedge block 71 and the second wedge block 72 can simultaneously move and contract towards the respective inner sides when the main wedge block 70 moves up; the first wedge block 71 and the second wedge block 72 are both of a central through hole structure and are coaxial with the central through hole of the positioning sleeve 3, a rectangular through hole 703 is formed in the center of the main wedge block 70, and in order to ensure that broaching is not interfered, the rectangular through hole 703 can cover the central through holes of the first wedge block 71 and the second wedge block 72 within a certain range of up-and-down movement. Through the sliding clamping fit among the main wedge block 70, the first wedge block 71, the second wedge block 72 and the trapezoid supporting block 2, the wedge block combination mechanism 7 can smoothly and smoothly expand towards two sides, and the purpose of tightly attaching the end faces of two inner sides of a first 900 lifting lug of a lifting lug part is further achieved.

Specifically, a T-shaped straight clamping groove 200 from bottom to top is formed in one side of the trapezoidal support block 2 in the embodiment, a T-shaped straight clamping opening 700 from bottom to top is formed in one side, close to the trapezoidal support block 2, of the main wedge block 70, the main wedge block 70 is clamped in the T-shaped straight clamping groove 200 of the trapezoidal support block 2 in a sliding manner through the T-shaped straight clamping opening 700, and the T-shaped straight clamping groove 200 limits the left-right and front-back freedom degrees of the main wedge block 70, so that the main wedge block 70 can only move up and down; the front side and the rear side of the main wedge block 70 are both provided with T-shaped inclined clamping grooves 701 from bottom to top, the tops of the two T-shaped inclined clamping grooves 701 incline towards the front side and the rear side respectively, namely, the cross section of the main wedge block 70 is in an inverted trapezoid shape, T-shaped inclined clamping openings 710 with corresponding sizes from bottom to top are formed in the rear side of the first wedge block 71 and the front side of the second wedge block 72, the first wedge block 71 is slidably clamped in the T-shaped inclined clamping groove 701 in the front side of the main wedge block 70 through the T-shaped inclined clamping opening 710 in the rear side, the second wedge block 72 is slidably clamped in the T-shaped inclined clamping groove 701 in the rear side of the main wedge block 70 through the T-shaped inclined clamping opening 710 in the front side, and the T-shaped inclined clamping grooves 701 limit the left-right freedom degree of the first wedge block 71 and the second wedge block 72; a front-back direction guide key 20 is further arranged on one side, close to the main wedge block 70, of the trapezoidal support block 2, guide grooves 720 are formed in one side edges, close to the trapezoidal support block 2, of the first wedge block 71 and the second wedge block 72, the first wedge block 71 and the second wedge block 72 are respectively connected to the guide keys 20 in a sliding and clamping mode through the corresponding guide grooves 720, the guide keys 20 limit the vertical freedom degree of the first wedge block 71 and the second wedge block 72, due to the matching of the inclined plane clamping grooves, the cross section of the main wedge block 70 is wide at the top and narrow at the bottom, and therefore when the main wedge block 70 moves downwards, the first wedge block 71 and the second wedge block 72 which are in close fit with each other can only move in the front-back direction along the guide keys 20; the main wedge 70 is further provided with an avoiding hole 702, the avoiding hole 702 can avoid the guide key 20 in a certain range, and the avoiding hole 702 is arranged so as not to interfere with the guide key 20 when the main wedge 70 is adjusted up and down, of course, the guide key 20 in the embodiment is a whole long key, and can be actually divided into a front section and a rear section, so that the avoiding hole 702 can be omitted, but some errors are caused by the consistency and the coaxiality of the sectional guide key, therefore, the structural design of the whole long guide key 20 and the avoiding hole 702 is adopted in the embodiment, the consistency and the coaxiality of the whole wedge combination mechanism 7 in the working adjustment process can be higher, and the dimensional accuracy and the coaxiality accuracy of the broaching two small holes can be further improved. When the main wedge 70 moves downwards, the first wedge 71 and the second wedge 72 can simultaneously move and expand towards the respective outer sides along the guide key 20 to tightly attach to the end surfaces of the two inner sides of the lifting lug of the first lifting lug part 900, so that the deformation of the first lifting lug part 900 in the broaching process is effectively prevented, the dimensional accuracy and the coaxiality accuracy of the two small holes are well ensured, and when the main wedge 70 moves upwards, the first wedge 71 and the second wedge 72 can simultaneously move and contract towards the respective inner sides along the guide key 20, so that the workpiece can be taken down.

In order to improve the front-rear collimation of the guide key 20 and avoid the deviation phenomenon which may be caused after long-time operation, a positioning groove 202 is formed on one side of the trapezoidal support block 2 close to the main wedge 70 in the embodiment, and the guide key 20 is fixedly connected in the positioning groove 202 through a screw. The limiting and positioning guarantee of the positioning groove 202 is provided, the problem of up-down deviation possibly caused after long-time work can be avoided, and the front-back collimation degree of the guide key 20 can be ensured, so that the coaxiality and consistency of the first wedge block 71 and the second wedge block 72 are ensured, and the size precision and the coaxiality precision of the two small holes in the broaching process are further ensured.

For laborsaving convenient when manual regulation, manual adjustment mechanism 8 in this embodiment specifically comprises pivot 80, driving lever 81 and the oblique handle 82 of button head, and pivot 80 rotates to be connected on anchor clamps body 1 and lie in 2 tops of trapezoidal supporting shoe, and driving lever 81 fixed connection is at pivot 80 middle part, and the oblique handle 82 fixed connection of button head is at the outer tip of pivot 80, and the oblique handle 82 of manual button head of pulling can drive driving lever 81 and rotate, and driving lever 81 can drive main voussoir 70 and reciprocate.

In order to save more labor when pulling the round-head inclined handle 82, make the adjustment of the whole manual adjustment mechanism 8 more continuous and smooth, and improve the adjustment precision, one end of the shift lever 81 in this embodiment has a cylindrical shift head 810, the upper edge of the main wedge 70 is provided with a shift groove 704, the cylindrical shift head 810 is movably connected with the shift groove 704, and the diameter of the cylindrical shift head 810 is equal to the width of the shift groove 704. Therefore, when the adjustment is performed, the cylindrical shifting block 810 is tightly attached to the upper surface and the lower surface of the shifting groove 704 and moves in a rolling manner relative to the shifting groove 704, the adjustment is flexible, the continuity and the controllability are high, the controllability is high when the first wedge block 71 and the second wedge block 72 move towards two sides and are tightly attached to each other, errors are not prone to occurring, and the adjustment precision is improved.

Specifically, the shift lever 81 in this embodiment is sleeved on the middle portion of the rotating shaft 80 and fixedly clamped with the rotating shaft 80 through the pin 83, and the head portion of the round-head inclined handle 82 is sleeved on the outer end portion of the rotating shaft 80 and fixedly clamped with the rotating shaft 80 through the clamping pin 84. The structure is labor-saving, convenient and quick, and is not easy to damage.

In order to improve the tightness of the mechanism inside the manual adjusting mechanism 8, an elastic collar 85 is further disposed between the shift lever 81 and the clamp body 1 in the present embodiment, and the elastic collar 85 is sleeved on the rotating shaft 80.

In order to reduce unnecessary connection and reduce the matching error between the wedge block combination mechanism 7, the trapezoidal support block 2 and the clamp body 1 in the embodiment are integrally formed.

Referring to fig. 1-11, the general working principle of the present embodiment is as follows:

firstly, inserting the large hole of the lifting lug part I900 into the shaft neck of the pre-positioning pin 4, enabling the rear end face of the large hole to be close to the end face of the shaft neck, and then rotating the lifting lug part I900 around the shaft neck of the pre-positioning pin 4 until the lower end face of the small hole touches the pre-positioning supporting screw 5 to finish pre-positioning.

Then the round-head inclined handle 82 is pulled anticlockwise to drive the shifting rod 81 to rotate, then the shifting groove 704 drives the main wedge block 70 to move downwards, the main wedge block 70 is in sliding clamping fit with the inclined surfaces between the first wedge block 71 and the second wedge block 72, and the limiting guide of the guide key 20 is added, so that the first wedge block 71 and the second wedge block 72 are driven to expand and move forwards and backwards, the end faces of the two inner sides of the lifting lug of the first lifting lug part 900 are attached tightly, and meanwhile, the end face of the outer side of the lifting lug of the first lifting lug part 900 is attached tightly to the end face of the positioning sleeve 3, and therefore final positioning is achieved.

When broaching is carried out by matching with a broaching tool by a broaching machine, the two inner side surfaces of the first lifting lug part 900 can be free from the influence of the size error before comparison, and the workpiece is prevented from deforming because of being attached tightly. The method lays a foundation for achieving the dimensional accuracy and the coaxiality accuracy of the working procedures, further improves the processing yield, and subsequently ensures the working accuracy, the service performance and the service life of the automobile.

The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a two aperture broaching of lug anchor clamps for which a characterized in that includes:

a clamp body (1);

the trapezoidal supporting block (2) is arranged at one end of the front side of the fixture body (1);

the positioning sleeve (3) is of a central through hole structure and penetrates through the center of the clamp body (1), and the positioning sleeve (3) is used for positioning the end face of the outer side of the workpiece lifting lug;

the pre-positioning device comprises a pre-positioning pin (4) used for positioning a large hole end of a workpiece, a pre-positioning supporting screw (5) used for positioning the bottom end face of a workpiece lifting lug and a support (6), the pre-positioning pin (4) is arranged at one end, far away from the trapezoidal supporting block (2), of the front side of the fixture body (1), the support (6) is arranged at the front side of the fixture body (1) and located below the positioning sleeve (3), and the pre-positioning supporting screw (5) is adjustably connected to the support (6);

the wedge block combination mechanism (7) is arranged on the trapezoidal support block (2), the wedge block combination mechanism (7) is of a central through hole structure, the central through hole of the wedge block combination mechanism (7) is coaxial with the central through hole of the positioning sleeve (3), and the wedge block combination mechanism (7) can expand between two inner side surfaces of the workpiece lifting lug so as to tightly attach to the end surfaces of the two inner side surfaces of the workpiece lifting lug;

the manual adjusting mechanism (8), the manual adjusting mechanism (8) is used for controlling the expansion and contraction of the wedge block combination mechanism (7);

the wedge block combination mechanism (7) comprises a main wedge block (70), a first wedge block (71) and a second wedge block (72); the main wedge block (70) is clamped on the trapezoidal supporting block (2) in a sliding manner, the first wedge block (71) is clamped on the front side of the main wedge block (70) in a sliding manner, and the second wedge block (72) is clamped on the rear side of the main wedge block (70) in a sliding manner;

the manual adjusting mechanism (8) can control the main wedge block (70) to move up and down, the first wedge block (71) and the second wedge block (72) can simultaneously move and expand towards the respective outer sides when the main wedge block (70) moves downwards, and the first wedge block (71) and the second wedge block (72) can simultaneously move and contract towards the respective inner sides when the main wedge block (70) moves upwards;

the first wedge block (71) and the second wedge block (72) are both of a central through hole structure and coaxial with the central through hole of the positioning sleeve (3), a rectangular through hole (703) is formed in the center of the main wedge block (70), and the rectangular through hole (703) can cover the central through holes of the first wedge block (71) and the second wedge block (72) within a certain range.

2. The two-eyelet broaching tool for a shackle as set forth in claim 1, wherein: a T-shaped straight clamping groove (200) is formed in one side of the trapezoidal support block (2) from bottom to top, a T-shaped straight bayonet (700) is formed in one side, close to the trapezoidal support block (2), of the main wedge block (70) from bottom to top, and the main wedge block (70) is slidably clamped in the T-shaped straight clamping groove (200) of the trapezoidal support block (2) through the T-shaped straight bayonet (700);

the front side and the rear side of the main wedge block (70) are respectively provided with a T-shaped inclined clamping groove (701) from bottom to top, the tops of the two T-shaped inclined clamping grooves (701) incline towards the front outer side and the rear outer side respectively, the rear side of the first wedge block (71) and the front side of the second wedge block (72) are respectively provided with a T-shaped inclined clamping opening (710) from bottom to top, the first wedge block (71) is slidably clamped in the T-shaped inclined clamping groove (701) on the front side of the main wedge block (70) through the T-shaped inclined clamping opening (710) on the rear side, and the second wedge block (72) is slidably clamped in the T-shaped inclined clamping groove (701) on the rear side of the main wedge block (70) through the T-shaped inclined clamping opening (710) on the front side;

a front guide key and a rear guide key (20) are further arranged on one side, close to the main wedge block (70), of the trapezoidal support block (2), guide grooves (720) are formed in edges of one sides, close to the trapezoidal support block (2), of the first wedge block (71) and the second wedge block (72), and the first wedge block (71) and the second wedge block (72) are respectively clamped on the guide keys (20) in a sliding mode through the corresponding guide grooves (720); the main wedge block (70) is also provided with avoidance holes (702), and the avoidance holes (702) can avoid the guide keys (20) within a certain range;

when the main wedge (70) moves downwards, the first wedge (71) and the second wedge (72) can move towards the respective outer sides simultaneously along the guide key (20) to expand, and when the main wedge (70) moves upwards, the first wedge (71) and the second wedge (72) can move towards the respective inner sides simultaneously along the guide key (20) to contract.

3. The two-eyelet broaching tool for a shackle as set forth in claim 2, wherein: a positioning groove (202) is formed in one side, close to the main wedge block (70), of the trapezoidal support block (2), and the guide key (20) is fixedly connected into the positioning groove (202).

4. The two-eyelet broaching tool for a shackle as set forth in claim 1, wherein: manual adjustment mechanism (8) are including pivot (80), driving lever (81) and button head angle lever (82), pivot (80) rotate to be connected on the anchor clamps body (1) and lie in trapezoidal supporting shoe (2) top, driving lever (81) fixed connection is in pivot (80) middle part, button head angle lever (82) fixed connection is at pivot (80) outer tip, and manual pulling button head angle lever (82) can drive driving lever (81) and rotate, and driving lever (81) can drive main voussoir (70) and reciprocate.

5. The two-eyelet broaching eye clamp of claim 4, wherein: one end of the shifting rod (81) is provided with a cylindrical shifting head (810), the edge of the upper part of the main wedge block (70) is provided with a shifting groove (704), the cylindrical shifting head (810) is movably clamped with the shifting groove (704), and the diameter of the cylindrical shifting head (810) is equal to the width of the shifting groove (704).

6. The two-eyelet broaching eye clamp of claim 4, wherein: the shifting rod (81) is sleeved in the middle of the rotating shaft (80) and fixedly clamped with the rotating shaft (80) through a pin key (83), and the head of the round-head inclined handle (82) is sleeved at the outer end of the rotating shaft (80) and fixedly clamped with the rotating shaft (80) through a clamping pin (84).

7. The two-eyelet broaching tool for a shackle as set forth in claim 6, wherein: an elastic retainer ring (85) is further arranged between the shifting rod (81) and the clamp body (1), and the elastic retainer ring (85) is sleeved on the rotating shaft (80).

8. The two-eyelet broaching tool for a shackle as set forth in claim 1, wherein: the trapezoidal supporting block (2) and the fixture body (1) are integrally formed.