A clamping device for workpieces with small positioning surfaces

Abstract

The present invention discloses a clamping device for a workpiece with a small positioning surface, comprising a clamp seat; a large drilling template and a small drilling template are respectively installed at the left and right ends of the upper end surface of the clamp seat; a first knife exit hole and a second knife exit hole are respectively arranged at the left and right sides of the upper part of the clamp seat at positions corresponding to the first circular hole and the second circular hole on the retaining hook to be processed; a positioning square hole is provided between the two knife exit holes; a positioning block is installed in the positioning square hole; a pressing arc surface is provided at the rear side of the left end of the pressure plate; the pressing arc surface is pressed against the front side surface of the retaining hook; the left end surface of the positioning block is the positioning block positioning surface, which is used to press against the positioning surface A on the retaining hook. The clamping device for a workpiece with a small positioning surface disclosed by the present invention can effectively solve the problem that it is inconvenient to clamp and press the workpiece with a small positioning surface, and reliably clamp and press the positioning surface A with a very small length on the retaining hook, so as to facilitate the processing of the two circular holes on the retaining hook and ensure the processing accuracy of the circular holes.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a clamping device for a workpiece with a small positioning surface. Background Art

[0002] See also Figure 1a and Figure 1b The retaining hook 100 is an action conversion transmission component of the existing ZK4 type switch machine contact group. Its appearance is a hook-shaped thin plate, with a first circular hole 101 and a second circular hole 102 respectively provided at both ends; the outer side surface of the retaining hook 100 is connected by a plurality of arc surfaces and short planes, and the structure is complex and the processing accuracy is not high, and all the key dimensions are related to the positioning surface A. Therefore, the first circular hole 101 and the second circular hole 102 at both ends need to be positioned by the positioning surface A.

[0003] The length L of the positioning surface A is very small (for example, it is actually only 1.7 mm), and the other side of the workpiece opposite to the positioning surface A is a complex cross section including a straight surface and an arc surface. In the complex cross section, the B surface is a short straight surface perpendicular to the positioning surface A, and the C surface is an oblique straight surface. When the retaining hook 100 is clamped, if any part of the other side of the workpiece opposite to the positioning surface A (for example, the B surface or the C surface) is pressed, the pressed retaining hook 100 will flip over and separate from the positioning surface A, so that the dimensional accuracy of the finished workpiece (i.e., the finished retaining hook 100) is poor and does not meet the use requirements.

[0004] However, there is currently no device that can reliably clamp and press the positioning surface A with a very small length on the retaining hook, so as to facilitate further processing of the two circular holes on the retaining hook and ensure the processing accuracy of the circular holes. Summary of the invention

[0005] The purpose of the present invention is to provide a clamping device for a workpiece with a small positioning surface in view of the technical defects in the prior art.

[0006] To this end, the present invention provides a clamping device for a workpiece with a small positioning surface, comprising a clamp seat;

[0007] Wherein, a shallow groove is respectively provided at the left and right ends of the upper end surface of the clamp seat;

[0008] The upper end surfaces of the two shallow grooves distributed on the left and right are respectively installed with the upper end of a large drilling template and the upper end of a small drilling template;

[0009] Wherein, a first knife exit hole and a second knife exit hole are respectively arranged on the left and right sides of the upper part of the clamp seat at positions corresponding to the first circular hole and the second circular hole on the retaining hook to be processed;

[0010] A positioning square hole is provided between the first knife outlet hole and the second knife outlet hole;

[0011] The longitudinally distributed positioning blocks are installed in the positioning square holes;

[0012] Among them, a stud bolt mounting hole is provided at the right position in the middle of the clamp seat;

[0013] Wherein, a fixed wedge is installed at the lower part of the fixture seat;

[0014] The top surface of the fixed wedge is the first inclined surface;

[0015] Wherein, the bottom surface of the movable plug is the second inclined surface;

[0016] wherein the first inclined surface is in contact with the second inclined surface;

[0017] Among them, the right end of the pressing plate is provided with a support nail mounting hole;

[0018] An oblong hole is provided in the middle of the pressing plate;

[0019] A pressing arc surface is provided at the rear side of the left end of the pressing plate;

[0020] The arc surface is pressed tightly to contact with the front side surface of the retaining hook;

[0021] Wherein, the stud bolt is fixed in the stud bolt mounting hole on the fixture seat after passing vertically through the oblong hole on the pressing plate;

[0022] Wherein, the left end surface of the positioning block is the positioning surface of the positioning block;

[0023] The positioning surface of the positioning block is used to press and contact with the positioning surface A on the retaining hook.

[0024] Preferably, the support nail vertically passes through the support nail installation hole at the right end of the pressing plate and contacts the front side surface of the clamp seat;

[0025] The rear end surface of the supporting pin is a supporting arc surface, which is used for pressing and contacting with the front side surface of the clamp seat.

[0026] Preferably, the upper end surfaces of the two shallow grooves are respectively provided with two drilling template mounting holes that are spaced apart laterally;

[0027] The small drilling template and the large drilling template are respectively installed in two shallow-grooved drilling template installation holes through hexagon socket screws.

[0028] Preferably, the left side view and the right side view of the small drilling template and the large drilling template are in an L shape.

[0029] Preferably, the first inclined plane and the second inclined plane have equal included angles with the horizontal plane;

[0030] The pressing surface on the top of the movable plug block is perpendicular to the positioning block positioning surface of the positioning block.

[0031] Preferably, two first hole combinations are provided on the left and right sides of the lower part of the clamp seat, and each first hole combination includes a second threaded hole and a pin hole;

[0032] The fixed wedge is fixed to the lower part of the fixture seat through the threaded hole and the pin hole by the hexagon socket screw and the pin respectively;

[0033] The top surface of the fixed wedge is the first inclined surface;

[0034] Two second hole combinations are arranged on the left and right sides of the lower part of the fixed wedge block, and each second hole combination includes a pin installation hole and a screw installation hole.

[0035] Preferably, the positioning block is in the shape of a cuboid.

[0036] Preferably, the lower end of the small drilling template and the lower end of the large drilling template are respectively provided with a first drill sleeve mounting hole and a second drill sleeve mounting hole;

[0037] The two drill sleeves are respectively installed in the first drill sleeve installation hole and the second drill sleeve installation hole.

[0038] Preferably, a fixing claw installation slot is provided at the lower left portion of the clamp seat;

[0039] The right side of the fixing claw installation slot has a first threaded hole distributed laterally;

[0040] The fixing claw is installed in the threaded hole on the right side of the fixing claw installation slot by means of a hexagon socket screw;

[0041] Among them, the left end of the movable plug block is provided with a traction groove running through the front and back;

[0042] The front end of the fixing claw is a semicircular arc surface, a knurled screw hole is provided in the middle of the front end, and a fixing claw mounting hole is provided in the middle of the rear end;

[0043] Wherein, the middle part of the knurled screw is installed in the knurled screw hole at the front end of the fixing claw;

[0044] The right end of the knurled screw is provided with a clamping head;

[0045] The card head is installed in the traction groove of the movable insert block.

[0046] Preferably, a shoulder nut is installed at the front end of the stud bolt.

[0047] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides a clamping device for workpieces with small positioning surfaces. The structural design is scientific, and the problem of inconvenient clamping and pressing of workpieces with small positioning surfaces can be effectively solved. The positioning surface A with a very small length on the retaining hook can be reliably clamped and pressed, thereby facilitating further processing of the two circular holes on the retaining hook and ensuring the processing accuracy of the circular holes. The device has great production practical significance.

[0048] By applying the present invention, not only is the processing operation of the circular hole on the retaining hook convenient and quick, but the processing of the circular hole is also accurate and reliable, thereby greatly improving the overall processing efficiency of the retaining hook. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1a is a top view of a retaining hook as a workpiece to be processed;

[0050] Figure 1b is a front view of a retaining hook as a workpiece to be processed;

[0051] Figure 2a A front view of a clamping device for a workpiece with a small positioning surface provided by the present invention when connected to a retaining hook as a workpiece to be processed;

[0052] Figure 2b A left side view of a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0053] Figure 2c A clamping device for a workpiece with a small positioning surface provided by the present invention is a left view when a knurled screw is removed;

[0054] Figure 2d A right side view of a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0055] Figure 2e A bottom view of a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0056] Figure 2f A top view of a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0057] Figure 3a A front view of a fixture seat in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0058] Figure 3b A top view of a fixture seat in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0059] Figure 3c A right side view of a fixture seat in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0060] Figure 3d A left side view of a fixture seat in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0061] Figure 4a A front view of a fixed wedge in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0062] Figure 4b A partial cross-sectional view of a fixed wedge in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0063] Figure 5a A front view of a movable insert in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0064] Figure 5b A left side view of a movable insert in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0065] Figure 6a A left side view of a fixed claw in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0066] Figure 6b A cross-sectional view of a fixed claw in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0067] Figure 7 A front view of a knurled screw in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0068] Figure 8a A front view of a small drilling template in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0069] Figure 8b A left side view of a small drilling template in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0070] Fig. 9 A transverse cross-sectional view of a drill sleeve in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0071] Fig.10a A transverse cross-sectional view of a pressure plate in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0072] Fig.10b A front view of a pressing plate in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0073] Fig.11a A front view of a positioning block in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0074] Fig.11b A left side view of a positioning block in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0075] Fig.12a A front view of a large drilling template in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0076] Figure 12b A left side view of a large drilling template in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0077] Fig.13 A top view of a support pin in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0078] Fig.14a A right side view of a shoulder nut in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0079] Fig.14b A front view of a shoulder nut in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0080] Fig.15 A top view of a stud bolt in a clamping device for a workpiece with a small positioning surface provided by the present invention;

[0081] In the figure, 100. retaining hook, 101. first circular hole, 102. second circular hole;

[0082] 1. Clamp seat, 2. Fixed wedge, 3. Movable insert, 4. Fixed claw; 5. Knurled screw;

[0083] 6. Small drill template, 7. Drill sleeve, 8. Press plate, 9. Positioning block, 10. Large drill template;

[0084] 11. Support nail, 12. Shoulder nut, 13. Shallow groove; 14. Drill template installation hole, 151. First knife hole, 152. Second knife hole;

[0085] 16. Positioning square hole; 17. Stud bolt mounting hole; 18. First threaded hole; 19. Fixing claw mounting groove; 20. Second threaded hole;

[0086] 21. Pin hole, 22. First inclined surface, 23. Pin mounting hole; 24. Screw mounting hole, 25. Second inclined surface;

[0087] 26. Pressing surface, 27. Positioning surface of positioning block; 28. Traction groove, 29. Knurled screw hole, 30. Fixing claw mounting hole;

[0088] 31. Clamp 32. First drill sleeve mounting hole, 33. Second drill sleeve mounting hole, 34. Support pin mounting hole; 35. Long round hole;

[0089] 36. Pressing arc surface, 37. Supporting arc surface, 38. Stud bolt. DETAILED DESCRIPTION

[0090] In order to make the technical means implemented by the present invention easier to understand, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant application, rather than to limit the application. It is also necessary to explain that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings.

[0091] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0092] It should be noted that, in the description of the present application, terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0093] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the term "installation" and the like should be understood in a broad sense, for example, it can be a fixed installation or a detachable installation.

[0094] For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0095] See also Figure 1a to Figure 1b , Figure 2a to Figure 2f , Figures 3a to 3d , Figure 4a to Figure 4b , Figure 5a to Figure 5b , Figure 6a to Figure 6b , Figure 7 , Figure 8a to Figure 8b , Fig. 9 , Figure 10a to Figure 10b , Figure 11a to Figure 11b , Figure 12a to Figure 12b , Fig.13 , Figure 14a to Figure 14b as well as Fig.15 The present invention provides a clamping device for a workpiece with a small positioning surface, comprising a clamp seat 1, a fixed wedge block 2, a movable insert block 3, a fixed claw 4, a knurled screw 5, a small drilling template 6, a drill sleeve 7, a pressure plate 8, a positioning block 9, a large drilling template 10, a support nail 11, a shoulder nut 12 and a stud bolt 38;

[0096] Wherein, a shallow groove 13 is provided at the left and right ends of the upper end surface of the clamp seat 1;

[0097] The upper end surfaces of the two shallow grooves 13 distributed on the left and right are respectively installed with the upper end of a large drilling template 10 and the upper end of a small drilling template 6;

[0098] Wherein, on the left and right sides of the upper part of the clamp seat 1, at positions corresponding to the first circular hole 101 and the second circular hole 102 on the retaining hook 100 to be processed, a first tool outlet hole 151 and a second tool outlet hole 152 are respectively provided;

[0099] A positioning square hole 16 is provided between the first knife outlet hole 151 and the second knife outlet hole 152;

[0100] The longitudinally distributed positioning blocks 9 are installed in the positioning square holes 16;

[0101] Wherein, a stud bolt mounting hole 17 is provided at the right position in the middle of the clamp seat 1;

[0102] Wherein, a fixing claw installation slot 19 is provided at the lower left position of the clamp seat 1;

[0103] The right side of the fixing claw installation slot 19 has a first threaded hole 18 distributed laterally;

[0104] The fixing claw 4 is installed in the first threaded hole 18 on the right side of the fixing claw installation groove 19 by means of a hexagon socket screw (the hexagon socket screw passes through the fixing claw installation hole 30 on the fixing claw 4);

[0105] Wherein, two first hole combinations are provided on the left and right sides of the lower part of the clamp seat 1, and each first hole combination includes a second threaded hole 20 and a pin hole 21;

[0106] The fixed wedge 2 is fixed to the lower part of the clamp seat 1 by a hexagon socket screw and a pin through a second threaded hole 20 and a pin hole 21 respectively;

[0107] The top surface of the fixed wedge 2 is a first inclined surface 22;

[0108] Two second hole combinations are provided on the left and right sides of the lower part of the fixed wedge block 2, each of which includes a pin mounting hole 23 and a screw mounting hole 24;

[0109] The bottom surface of the movable plug block 3 is a second inclined surface 25;

[0110] Wherein, the first inclined surface 22 and the second inclined surface 25 are in contact;

[0111] The left end of the movable plug block 3 is provided with a traction groove 28 which runs through the front and back.

[0112] The front end of the fixing claw 4 is a semicircular arc surface, a knurled screw hole 29 is provided in the middle of the front end, and a fixing claw mounting hole 30 is provided in the middle of the rear end;

[0113] The middle part of the knurled screw 5 is installed in the knurled screw hole 29 at the front end of the fixing claw 4;

[0114] The right end of the knurled screw 5 is provided with a clamping head 31;

[0115] The clamping head 31 is installed in the traction groove 28 of the movable plug block 3, so that the movable plug block 3 can follow the knurled screw 5 to move horizontally left and right;

[0116] The upper end of the small drilling template 6 and the upper end of the large drilling template 10 are respectively installed in the shallow groove 13 on the upper end surface of the fixture seat 1 through the hexagon socket screws;

[0117] The lower end of the small drilling template 6 and the lower end of the large drilling template 10 are respectively provided with a first drill sleeve mounting hole 32 and a second drill sleeve mounting hole 33;

[0118] Two drill sleeves 7, respectively installed in the first drill sleeve installation hole 32 and the second drill sleeve installation hole 33;

[0119] Wherein, the right end of the pressing plate 8 is provided with a support nail mounting hole 34;

[0120] An oblong hole 35 is provided in the middle of the pressing plate 8;

[0121] A pressing arc surface 36 is provided at the rear side of the left end of the pressing plate 8;

[0122] The arc surface 36 is pressed against the front side surface of the retaining hook 100;

[0123] The stud bolt 38 is fixed in the stud bolt mounting hole 17 on the clamp seat 1 after passing through the oblong hole 35 on the pressing plate 8 vertically in the longitudinal direction;

[0124] A shoulder nut 12 (threaded connection) is installed at the front end of the stud bolt 38;

[0125] Wherein, the positioning block 9 is in the shape of a longitudinally distributed rectangular parallelepiped;

[0126] The left end surface of the positioning block 9 is the positioning block positioning surface 27;

[0127] The positioning surface 27 of the positioning block is used to press and contact (i.e., closely contact) with the positioning surface A on the retaining hook 100;

[0128] In the present invention, in a specific implementation, the support pin 11 vertically passes through the support pin installation hole 34 at the right end of the pressing plate 8 and contacts the front side of the clamp seat 1;

[0129] The rear end surface of the supporting pin 11 is a supporting arc surface 37 for pressing against the front side surface of the clamp seat 1 .

[0130] In the present invention, in a specific implementation, the first inclined surface 22 and the second inclined surface 25 have equal (consistent) angles with the horizontal plane to ensure that when the first inclined surface 22 and the second inclined surface 25 are in close contact during use, the clamping surface 26 at the top of the movable plug 3 is perpendicular to the positioning block positioning surface 27 of the positioning block 9.

[0131] For example, see Figure 4b and Figure 5a As shown, the inclination angle of the first inclined surface 22 is α, and the inclination angle of the second inclined surface 25 is also α.

[0132] In the present invention, in a specific implementation, the upper end surfaces of the two shallow grooves 13 are respectively provided with two drilling template mounting holes 14 that are distributed laterally at intervals;

[0133] The small drilling template 6 and the large drilling template 10 are respectively installed in the drilling template installation holes 14 of the two shallow grooves 13 by means of hexagon socket screws.

[0134] In the present invention, in a specific implementation, the left side view and the right side view of the small drilling template 6 and the large drilling template 10 are in an L shape.

[0135] In order to more clearly understand the technical solution of the present invention, the operation process of the present invention is described below.

[0136] First, place the device of the present invention on a horizontal workbench, remove the movable plug block 3, and loosen the knurled screw 5 to the clamping head 31;

[0137] Then, the holding hook 100 as the workpiece to be processed is inserted into the device of the present invention from the gap between the front side of the clamp seat 1 and the rear side of the left large drilling template 10, and the gap between the front side of the clamp seat 1 and the clamp seat 1;

[0138] Then, adjust the position of the holding hook 100 as the workpiece to be processed so that the positioning surface A of the holding hook 100 is in close contact with the positioning block positioning surface 27 at the left end of the positioning block 9;

[0139] Then, the second inclined surface 25 on the movable insert block 3 is brought into contact with the first inclined surface 22 of the fixed wedge block 2, and the clamping head 31 is placed in the traction groove 28;

[0140] Then, the knurled screw 5 is rotated clockwise, so that the movable insert block 3 follows the rotation of the knurled screw 5 and slides along the first inclined surface 22 on the fixed wedge block 2, forcing the pressing surface 26 of the movable insert block 3 to approach and squeeze the short straight surface B of the workpiece to be processed (i.e., the retaining hook 100);

[0141] Then, tighten the shoulder nut 12 on the stud bolt 38 that passes through the pressure plate 8 to complete the clamping of the workpiece to be processed (i.e., the retaining hook 100). At this time, the first circular hole 101 and the second circular hole 102 of the retaining hook 100 can be processed by existing equipment (e.g., a hole processing tool on an existing lathe, such as a drill bit).

[0142] Compared with the prior art, the clamping device for a workpiece with a small positioning surface provided by the present invention has the following beneficial effects:

[0143] 1. The present invention aims at the situation that a workpiece with a small positioning surface (holding hook 100) is easy to cause the workpiece to separate from the positioning surface when clamping. The wedge clamping mechanism is used to squeeze the workpiece from one side of the positioning surface to prevent the workpiece from turning over when the workpiece is clamped;

[0144] 2. The workpiece positioning structure adopted by the present invention can correspond to the rotation direction of the tool. The workpiece clamping method of the device enables the drill bit rotating clockwise during work to press the positioning surface, thereby ensuring the accuracy of the processing size and the consistency of the processing;

[0145] 3. The present invention provides a supporting arc surface at the end of the supporting nail, which can be adapted to press workpieces within a certain thickness range;

[0146] 4. The oblong holes provided on the pressing plate of the present invention facilitate the clamping and disassembly of the workpiece.

[0147] To sum up, compared with the prior art, the clamping device for a workpiece with a small positioning surface provided by the present invention has a scientific structural design, can effectively solve the problem that it is inconvenient to clamp and press the workpiece with a small positioning surface, and can reliably clamp and press the positioning surface A with a very small length on the retaining hook, thereby facilitating further processing of the two circular holes on the retaining hook and ensuring the processing accuracy of the circular holes, which has great production practical significance.

[0148] By applying the present invention, not only is the processing operation of the circular hole on the retaining hook convenient and quick, but the processing of the circular hole is also accurate and reliable, thereby greatly improving the overall processing efficiency of the retaining hook.

[0149] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A clamping device for a workpiece with a small positioning surface, characterized in that: It comprises a fixture seat (1), a movable plug block (3) and a pressing plate (8); Wherein, a shallow groove (13) is respectively provided at the left and right ends of the upper end surface of the clamp seat (1); The upper end surfaces of the two shallow grooves (13) distributed on the left and right are respectively mounted with the upper end of a large drilling template (10) and the upper end of a small drilling template (6); Wherein, a first tool exit hole (151) and a second tool exit hole (152) are respectively provided on the left and right sides of the upper part of the clamp seat (1) at positions corresponding to the first circular hole (101) and the second circular hole (102) on the retaining hook (100) to be processed; A positioning square hole (16) is provided between the first knife outlet hole (151) and the second knife outlet hole (152); The longitudinally distributed positioning blocks (9) are installed in the positioning square holes (16); Wherein, a stud bolt mounting hole (17) is provided at the right position in the middle of the clamp seat (1); Wherein, the fixed wedge block (2) is installed at the lower part of the clamp seat (1); The top surface of the fixed wedge (2) is a first inclined surface (22); The bottom surface of the movable plug (3) is a second inclined surface (25); Wherein, the first inclined surface (22) and the second inclined surface (25) are in contact; Wherein, a support nail mounting hole (34) is provided at the right end of the pressing plate (8); A long circular hole (35) is provided in the middle of the pressing plate (8); A pressing arc surface (36) is provided at the rear side of the left end of the pressing plate (8); The arc surface (36) is pressed against the front side surface of the retaining hook (100); The stud bolt (38) is vertically passed through the oblong hole (35) on the pressing plate (8) and is fixed in the stud bolt mounting hole (17) on the clamp seat (1); Wherein, the left end surface of the positioning block (9) is the positioning block positioning surface (27); The positioning block positioning surface (27) is used to press and contact with the positioning surface A on the retaining hook (100); The support pin (11) vertically passes through the support pin mounting hole (34) at the right end of the pressing plate (8) and contacts the front side surface of the clamp seat (1); The rear end surface of the support pin (11) is a support arc surface (37) for contacting with the front side surface of the clamp seat (1); The upper end surfaces of the two shallow grooves (13) are respectively provided with two drilling template mounting holes (14) that are spaced apart in a transverse direction; The small drilling template (6) and the large drilling template (10) are respectively installed in the drilling template installation holes (14) of the two shallow grooves (13) by means of hexagon socket screws.

2. The clamping device for a workpiece with a small positioning surface as claimed in claim 1, characterized in that: The left side view and the right side view of the small drilling template (6) and the large drilling template (10) are L-shaped.

3. The clamping device for a workpiece with a small positioning surface as claimed in claim 1, characterized in that: The first inclined surface (22) and the second inclined surface (25) have equal included angles with the horizontal plane; The pressing surface (26) at the top of the movable insert block (3) is perpendicular to the positioning block positioning surface (27) of the positioning block (9).

4. The clamping device for a workpiece with a small positioning surface as claimed in claim 1, characterized in that: Two first hole combinations are provided on the left and right sides of the lower part of the clamp seat (1), and each first hole combination includes a second threaded hole (20) and a pin hole (21); The fixed wedge (2) is fixed to the lower part of the clamp seat (1) by a hexagon socket screw and a pin through the second threaded hole (20) and the pin hole (21), respectively; The top surface of the fixed wedge (2) is a first inclined surface (22); Two second hole combinations are provided on the left and right sides of the lower part of the fixed wedge block (2), and each second hole combination includes a pin mounting hole (23) and a screw mounting hole (24).

5. The clamping device for a workpiece with a small positioning surface as claimed in claim 1, characterized in that: The positioning block (9) is in the shape of a rectangular parallelepiped.

6. The clamping device for a workpiece with a small positioning surface according to any one of claims 1 to 5, characterized in that: The lower end of the small drilling template (6) and the lower end of the large drilling template (10) are respectively provided with a first drill sleeve mounting hole (32) and a second drill sleeve mounting hole (33); The two drill sleeves (7) are respectively installed in the first drill sleeve installation hole (32) and the second drill sleeve installation hole (33).

7. The clamping device for a workpiece with a small positioning surface according to any one of claims 1 to 5, characterized in that: A fixing claw mounting groove (19) is provided at the lower left portion of the fixture seat (1); The right side of the fixing claw installation groove (19) has a first threaded hole (18) distributed laterally; The fixing claw (4) is installed in the first threaded hole (18) on the right side of the fixing claw installation groove (19) by means of a hexagon socket screw; The left end of the movable plug block (3) is provided with a traction groove (28) running through the front and rear. The front end of the fixing claw (4) is a semicircular arc surface, a knurled screw hole (29) is provided in the middle of the front end, and a fixing claw mounting hole (30) is provided in the middle of the rear end; The middle portion of the knurled screw (5) is mounted in the knurled screw hole (29) at the front end of the fixing claw (4); The right end of the knurled screw (5) is provided with a clamping head (31); The clamping head (31) is installed in the traction groove (28) of the movable insert block (3).

8. The clamping device for a workpiece with a small positioning surface according to any one of claims 1 to 5, characterized in that: A shoulder nut (12) is mounted on the front end of the stud bolt (38).

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