Pneumatic compression drilling clamp for shafts

Abstract

The utility model discloses a shaft type pneumatic pressing drilling clamp which comprises a positioning seat, a V-shaped groove and a pressing rod hinged to the top of the positioning seat are arranged on the positioning seat, a top plate is arranged above the positioning seat in an overhead mode, and a drilling sleeve corresponding to the V-shaped groove and a pressing air cylinder capable of pressing the pressing rod downwards are arranged on the top plate. The V-shaped groove has the function of automatically centering the cylinder, and circular shafts with different shaft diameters can be stably supported. When the positioning device is used, a circular shaft workpiece is placed in the V-shaped groove of the positioning seat, the pressing rod is pressed through the pressing air cylinder, and the circular shaft workpiece is pressed from the top, so that the circular shaft workpiece is reliably positioned. Due to the fact that the positioning seat has good applicability to the circular shafts with different shaft diameters, the circular shaft drilling fixture does not need to be frequently replaced to adapt to workpieces with different specifications, generality to circular shaft products is greatly enhanced, switching and dismounting steps of the fixtures with different specifications can be greatly reduced, working hours are saved, and efficiency and quality of circular shaft drilling are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a drilling device more specifically, it relates to a kind of shaft pneumatic pressing drilling fixture. BACKGROUND

[0002] In the production process of metal round shaft products, due to the use requirements, the round shaft needs to be drilled first, and the length of the shaft is different, the outer diameter is different, the product types are various, and the drilling position is also different. Therefore, the corresponding drilling tool types are various, and the staff uses it inconveniently. The round sleeve type fixture is usually used for drilling, and the shaft is directly placed in the round sleeve. The position of drilling is positioned by the spacer ring behind the round sleeve. This fixture is prone to cause a large number of round sleeves, increased cost, and management difficulties. During the drilling process of the shaft, due to the variety of tooling, it is inconvenient for the staff to replace the tooling when switching product models, and there is a certain error in drilling accuracy. The utility model patent with the publication number CN211102673U discloses a shaft drilling and washing tank all-in-one machine. The utility model can use the gravity of the workpiece to drive a pair of clamping pieces through a connecting rod mechanism to achieve clamping and positioning of the workpiece, and then implement subsequent drilling, washing tank and other operations. However, the positioning effect of the utility model is affected by the weight of the workpiece, and the working performance is not reliable. Moreover, it is not suitable for different shaft diameter workpieces. SUMMARY

[0003] The existing round shaft drilling fixture is prone to cause a large number of tooling, inconvenient operation, poor drilling accuracy, increased cost, and management difficulties. To overcome these defects, the utility model provides a kind of shaft pneumatic pressing drilling fixture, which can enhance the versatility of the fixture, reduce the tooling specifications and quantity, facilitate operation and management, and reduce cost.

[0004] The technical scheme of the utility model is as follows: a kind of shaft pneumatic pressing drilling fixture, including positioning seat, V-shaped groove is equipped on the positioning seat, and pressing rod is hinged on the top of positioning seat, top plate is arranged above the positioning seat, drill sleeve corresponding with V-shaped groove and pressing cylinder capable of pressing pressing rod are arranged on the top plate. The V-shaped groove has the function of automatically centering the cylinder, and can stably support the round shaft of different shaft diameters. When using the utility model, the round shaft workpiece is placed in the V-shaped groove of the positioning seat, and the pressing rod is pressed by the pressing cylinder. The round shaft workpiece is pressed from the top, so that the round shaft workpiece is reliably positioned. Since the positioning seat has good applicability to round shafts of different shaft diameters, the utility model does not need to frequently replace the fixture to adapt to different specifications of workpieces, and the versatility of the round shaft product is greatly enhanced. The switching, disassembly and assembly steps of different specifications of fixtures can be greatly reduced, the working hours can be saved, and the efficiency and quality of round shaft drilling can be significantly improved.

[0005] As preferred, one end of the pressure rod is hinged on the positioning seat, and the other end corresponds to the pressing cylinder, and an elastic top block is arranged below the end. The pressure rod constitutes a lever mechanism, the pressing cylinder can generate a large pressing force with a small pushing force, and the elastic top block can gently support the end of the pressure rod to prevent the end of the pressure rod from freely falling and generating a large impact to damage the workpiece and the pressure rod itself.

[0006] As preferred, the positioning seat is provided with a top block accommodating hole, a spring is arranged in the top block accommodating hole, and the elastic top block is adapted to be placed in the top block accommodating hole and located above the spring. Such a structure can realize the elastic supporting function of the elastic top block. When the pressure rod is pressed down by the pressing cylinder, the elastic top block slowly descends under the support of the elastic force of the spring, and a buffering and energy absorbing effect is generated.

[0007] As preferred, a spacer is arranged between the positioning seat and the top plate, and the positioning seat and the top plate are connected through bolts. The spacer can keep a distance between the positioning seat and the top plate, avoid the direct contact of the top plate with the positioning seat to cause tilting, ensure that the drill sleeve and the workpiece positioned in the V-shaped groove maintain a stable relative position, and thus ensure the accuracy of drilling on the workpiece.

[0008] As preferred, the top plate is provided with a drill sleeve hole, the drill sleeve is in a cylindrical shape and is provided with a flange at the top, and the drill sleeve is adapted to be inserted into the drill sleeve hole. The drill sleeve and the drill sleeve hole are inserted and matched, and are convenient to disassemble and assemble.

[0009] As preferred, the positioning seat is provided with an axial end abutment located on the extended line of the axis of the V-shaped groove. The axial end abutment is used to abut against the end face of the round shaft workpiece to realize the axial positioning of the workpiece.

[0010] As preferred, the included angle of the groove wall of the V-shaped groove is 50°-70°.

[0011] As preferred, the bottom surface of the pressure rod is provided with an arc-shaped concave surface. When the pressure rod presses the workpiece, the arc-shaped concave surface can better match the outer peripheral surface of the workpiece.

[0012] The beneficial effects of the present application are as follows:

[0013] Good universality and simplified operation. The V-shaped groove on the positioning seat has the function of automatically centering the cylinder. Different shaft diameters of the round shaft can be stably supported, the universality of the round shaft product is greatly enhanced, the fixture configuration can be greatly reduced, the switching and disassembling steps are reduced, the working hours are saved, and thus the efficiency of round shaft drilling is significantly improved.

[0014] Improved drilling accuracy. The present application adopts the V-shaped groove support combined with the lever force pressing, can reliably position the round shaft workpiece, and is beneficial to improve the drilling accuracy.

[0015] Simple structure and low cost. The present application has good universality, can reduce the configuration of parts, and reduce the procurement, use and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A use state schematic view of the utility model.

[0017] Figure 2 A structure schematic view of the positioning seat in the utility model.

[0018] Figure 3 A plan view of the positioning seat in the utility model.

[0019] Figure 4 A front view of the top plate in the utility model.

[0020] Figure 5 A plan view of the top plate in the utility model.

[0021] Figure 6 A front view of the pressing rod in the utility model.

[0022] In the figure, 1-positioning seat, 2-V-shaped groove, 3-pressing rod, 4-top plate, 5-drill sleeve, 6-pressing cylinder, 7-elastic top block, 8-top block containing hole, 9-spring, 10-drill sleeve hole, 11-arc concave surface, 12-pad, 13-threaded hole, 14-bolt mounting hole, 15-shaft end abutment, 16-round shaft workpiece. DETAILED DESCRIPTION

[0023] The utility model will be further explained in connection with the specific embodiment of the accompanying drawings.

[0024] Example 1:

[0025] As Figures 1 to 6As shown, a kind of shaft pneumatic pressing drilling clamp, including positioning seat 1, pressing rod 3, top plate 4, drill sleeve 5 and pressing cylinder 6.Positioning seat 1 is overall rectangular, positioning seat 1 is equipped with V-shaped groove 2 for placing round shaft workpiece 15, the groove wall included angle of V-shaped groove 2 is 60 °, V-shaped groove 2 is through the front and back two faces of positioning seat 1 and V-shaped groove 2 slot opening is on the top surface of positioning seat 1.Pressing rod 3 left end is hinged in the top surface of positioning seat 1, and the hinge point is located between the left side edge of positioning seat 1 and V-shaped groove 2, and pressing rod 3 rotates around hinge point in a plane perpendicular to the axis of V-shaped groove 2.The bottom surface of pressing rod 3 is equipped with a segment of arc concave surface 11, and arc concave surface 11 can be contacted with the outer circumferential surface of round shaft workpiece 15 in V-shaped groove 2.Positioning seat 1 top surface is close to the four corners and is equipped with threaded hole 13, each threaded hole 13 is equipped with a gasket 12, and gasket 12 is fixed on positioning seat 1 by bolt, and each gasket 12 is identical in size.Top plate 4 is rectangular, and the size of top plate 4 is identical with the top surface of positioning seat 1, and top plate 4 is opened with bolt mounting hole 14 corresponding to threaded hole 13, and top plate 4 is placed on gasket 12, and is locked by bolt after penetrating bolt mounting hole 14 and being screwed into threaded hole 13, so that top plate 4 is arranged above positioning seat 1 and is parallel with the top surface of positioning seat 1.Top plate 4 is equipped with a drill sleeve hole 10, and the position of drill sleeve hole 10 is directly above the middle part of V-shaped groove 2, and drill sleeve 5 includes cylindrical drill sleeve body and flange on the outer circumferential surface of the top of drill sleeve body, and flange is integrally formed with drill sleeve body, and drill sleeve body is adaptively inserted into drill sleeve hole 10.

[0026] The pressing cylinder 6 is vertically installed on the top plate 4 by bolts, and the output end of the pressing cylinder 6 faces downward. A piston rod through hole is also formed in the top plate 4, which penetrates the upper and lower surfaces of the top plate 4 and is opposite to the center of the end face of the pressing cylinder 6. The piston rod of the pressing cylinder 6 extends and retracts in the piston rod through hole. The end of the piston rod is fixed with a pressing plate. When the piston rod extends, the pressing plate can press the right end of the pressing rod 3 downward. The pressing cylinder 6 is switched by a foot switch. The positioning seat 1 is provided with a top block accommodating hole 8 on the right side. An elastic top block 7 and a spring 9 are installed in the top block accommodating hole 8. The spring 9 is a cylindrical helical spring. The elastic top block 7 is located above the spring 9 and contacts the bottom of the spring 9. The elastic top block 7 is cylindrical and is matched with the top block accommodating hole 8. The elastic top block 7 is slidably connected in the top block accommodating hole 8. The elastic top block 7, the spring 9 and the top block accommodating hole 8 are coaxial. The elastic top block 7 corresponds to the right end of the pressing rod 3 and presses the bottom of the pressing rod 3. The elastic top block 7 is slightly deviated from the position of the piston rod through hole, so the contact position of the pressing plate on the pressing rod 3 and the contact position of the elastic top block 7 on the pressing rod 3 are axially deviated. The positioning seat 1 is provided with a screw rod connecting hole and a guide rod hole. The screw rod connecting hole and the guide rod hole are symmetrically arranged on both sides of the V-shaped groove 2 and penetrate the front and back surfaces of the positioning seat 1. A screw rod is threadedly connected in the screw rod connecting hole. A guide rod is matched and connected in the guide rod hole. The guide rod is slidably connected in the guide rod hole. The screw rod and the guide rod are exposed on the front and back surfaces of the positioning seat 1. The exposed end of the screw rod on the back surface of the positioning seat 1 is a light shaft section. The shaft end abutment 15 is rotatably connected with the light shaft section and is axially positioned by a check ring. A handle is arranged on the exposed end of the screw rod on the front surface of the positioning seat 1. The exposed end of the guide rod on the back surface of the positioning seat 1 is fixed on the shaft end abutment 15. A scale is arranged on the guide rod. The shaft end abutment 15 is located on the axis extension line of the V-shaped groove 2.

[0027] The shaft pneumatic pressing and drilling clamp is arranged below the drill bit of the drilling machine. When the radial hole is drilled in the round shaft workpiece 12, the operation steps are as follows: first, the round shaft workpiece 12 is placed in the V-shaped groove 2 of the positioning seat 1. The axial direction of the round shaft workpiece 12 is parallel to the axial direction of the V-shaped groove 2. The two inclined groove walls of the V-shaped groove 2 abut against the circumferential surface of the round shaft workpiece 12. According to the drilling position, the handle is rotated to rotate the screw rod and convert the rotation between the screw rod and the positioning seat 1 into the axial movement of the screw rod, so as to change the distance between the shaft end abutment 15 and the positioning seat 1 and push the round shaft workpiece 12 until the end face of the round shaft workpiece 12 abuts against the shaft end abutment 15. Then, the foot switch is pressed, the pressing cylinder 6 pushes the pressing rod 3 to press the round shaft workpiece 12. The drilling machine is started, the drill bit penetrates the drill sleeve 5 and drills the round shaft workpiece 12. After the drilling is completed, the pressing cylinder 6 is reset, the pressing rod 3 is released, and the round shaft workpiece 12 is pulled out.

[0028] Example 2:

[0029] The utility model provides a kind of shaft pneumatic pressing drilling fixture, including positioning seat 1, pressing rod 3, top plate 4, drill sleeve 5 and pressing cylinder 6.Positioning seat 1 is cuboid as a whole, positioning seat 1 is equipped with V-shaped groove 2 for placing round shaft workpiece 15, different from embodiment 1, the groove wall included angle of V-shaped groove 2 in this embodiment is 50 °, V-shaped groove 2 penetrates the front and back two faces of positioning seat 1 and V-shaped groove 2 slot opening is on the top surface of positioning seat 1.Pressing rod 3 left end is hinged in the top surface of positioning seat 1, hinging point is between the left side edge of positioning seat 1 and V-shaped groove 2, and pressing rod 3 rotates in a plane perpendicular to the axis of V-shaped groove 2 around hinging point.A segment of arc concave surface 11 is equipped on the bottom surface of pressing rod 3, and arc concave surface 11 can be contacted with the outer circumferential surface of round shaft workpiece 15 in V-shaped groove 2.Threaded hole 13 is equipped in the vicinity of four corners of the top surface of positioning seat 1, different from embodiment 1, a sleeve is equipped outside each threaded hole 13 in this embodiment, and the position of sleeve and threaded hole 13 is overlapped, and each sleeve is identical in size.Top plate 4 is rectangular, and the size of top plate 4 is identical with the top surface of positioning seat 1, and bolt mounting hole 14 corresponding to threaded hole 13 is opened in top plate 4, top plate 4 is placed on the sleeve, and after bolt is penetrated through bolt mounting hole 14 and sleeve, it is locked by being screwed into threaded hole 13, so that top plate 4 is arranged in the air above positioning seat 1 and parallel with the top surface of positioning seat 1.A drill sleeve hole 10 is equipped on top plate 4, and the position of drill sleeve hole 10 is directly above the middle part of V-shaped groove 2, drill sleeve 5 includes cylindrical drill sleeve main body and flange on the outer circumferential surface of the top of drill sleeve main body, and flange is integrally formed with drill sleeve main body, and drill sleeve main body is adapted to be inserted into drill sleeve hole 10.

[0030] The pressing cylinder 6 is vertically installed on the top plate 4 by bolts, and the output end of the pressing cylinder 6 faces downward. A piston rod through hole is also formed in the top plate 4, which penetrates the upper and lower surfaces of the top plate 4 and is opposite to the center of the end face of the pressing cylinder 6. The piston rod of the pressing cylinder 6 extends and retracts in the piston rod through hole. The end of the piston rod is fixed with a pressing plate. When the piston rod extends, the pressing plate can press the right end of the pressing rod 3 downward. The pressing cylinder 6 is switched by a foot switch. The positioning seat 1 is provided with a top block accommodating hole 8 on the right side. An elastic top block 7 and a spring 9 are installed in the top block accommodating hole 8. The spring 9 is a cylindrical helical spring. The elastic top block 7 is located above the spring 9 and contacts the bottom of the spring 9. The elastic top block 7 is cylindrical and is matched with the top block accommodating hole 8. The elastic top block 7 is slidably connected in the top block accommodating hole 8. The elastic top block 7, the spring 9 and the top block accommodating hole 8 are coaxial. The elastic top block 7 corresponds to the right end of the pressing rod 3 and presses the bottom of the pressing rod 3. The elastic top block 7 is slightly deviated from the position of the piston rod through hole, so the contact position of the pressing plate on the pressing rod 3 and the contact position of the elastic top block 7 on the pressing rod 3 are axially deviated. A screw rod connecting hole and a guide rod hole are provided on the positioning seat 1. The screw rod connecting hole and the guide rod hole are symmetrically arranged on both sides of the V-shaped groove 2 and penetrate the front and back surfaces of the positioning seat 1. A screw rod is threadedly connected in the screw rod connecting hole. A guide rod is matched and connected in the guide rod hole. The guide rod is slidably connected in the guide rod hole. The screw rod and the guide rod are exposed on the front and back surfaces of the positioning seat 1. The exposed end of the screw rod on the back surface of the positioning seat 1 is a light shaft section. The shaft end abutment 15 is rotatably connected with the light shaft section and is axially positioned by a check ring. A handle is arranged on the exposed end of the screw rod on the front surface of the positioning seat 1. The exposed end of the guide rod on the back surface of the positioning seat 1 is fixed on the shaft end abutment 15. A scale is arranged on the guide rod. The shaft end abutment 15 is located on the axis extension line of the V-shaped groove 2. The rest is the same as example 1.

[0031] The shaft pneumatic pressing and drilling clamp is arranged below the drill bit of the drilling machine. When the radial hole is drilled in the round shaft workpiece 12, the operation steps are as follows: first, the round shaft workpiece 12 is placed in the V-shaped groove 2 of the positioning seat 1. The axial direction of the round shaft workpiece 12 is parallel to the axial direction of the V-shaped groove 2. The two inclined groove walls of the V-shaped groove 2 abut against the circumferential surface of the round shaft workpiece 12. According to the drilling position, the handle is rotated to rotate the screw rod and convert the rotation between the screw rod and the positioning seat 1 into the axial movement of the screw rod, so as to change the distance between the shaft end abutment 15 and the positioning seat 1 and push the round shaft workpiece 12 until the end surface of the round shaft workpiece 12 abuts against the shaft end abutment 15. Then, the foot switch is pressed, the pressing cylinder 6 pushes the pressing rod 3 to press the round shaft workpiece 12. The drilling machine is started, the drill bit penetrates the drill sleeve 5 and drills the round shaft workpiece 12. After the drilling is completed, the pressing cylinder 6 is reset, the pressing rod 3 is released, and the round shaft workpiece 12 is pulled out.

[0032] Example 3:

[0033] The utility model provides a kind of shaft pneumatic pressing drilling fixture, including positioning seat 1, pressing rod 3, top plate 4, drill sleeve 5 and pressing cylinder 6.Positioning seat 1 is cuboid as a whole, positioning seat 1 is equipped with V-shaped groove 2 for placing round shaft workpiece 15, different from embodiment 1, the groove wall included angle of V-shaped groove 2 is 70 ° in the embodiment, V-shaped groove 2 penetrates the front and back two faces of positioning seat 1 and V-shaped groove 2 slot opening is on the top surface of positioning seat 1.Pressing rod 3 left end is hinged in the top surface of positioning seat 1, hinging point is between the left side edge of positioning seat 1 and V-shaped groove 2, and pressing rod 3 rotates in a plane perpendicular to the axis of V-shaped groove 2 around hinging point.A segment of arc concave surface 11 is equipped on the bottom surface of pressing rod 3, and arc concave surface 11 can be contacted with the outer circumferential surface of round shaft workpiece 15 in V-shaped groove 2.Threaded hole 13 is equipped on the top surface of positioning seat 1 near four corners, and each threaded hole 13 is equipped with a gasket 12, gasket 12 is fixed on positioning seat 1 by bolt, and each gasket 12 is identical in size.Top plate 4 is rectangular, and the size of top plate 4 is identical with the top surface of positioning seat 1, and bolt mounting hole 14 corresponding to threaded hole 13 is opened on top plate 4, top plate 4 is placed on gasket 12, and bolt is passed through bolt mounting hole 14 and is screwed into threaded hole 13 to lock, so that top plate 4 is arranged above positioning seat 1 and parallel with the top surface of positioning seat 1.Top plate 4 is equipped with a drill sleeve hole 10, and the position of drill sleeve hole 10 is directly above the middle part of V-shaped groove 2, drill sleeve 5 includes cylindrical drill sleeve main body and flange on the outer circumferential surface of the top of drill sleeve main body, and the flange is integrally formed with drill sleeve main body, and drill sleeve main body is adapted to be inserted into drill sleeve hole 10.

[0034] The pressing cylinder 6 is vertically installed on the top plate 4 by bolts, and the output end of the pressing cylinder 6 faces downward. A piston rod through hole is also formed in the top plate 4, which penetrates the upper and lower surfaces of the top plate 4 and is opposite to the center of the end face of the pressing cylinder 6. The piston rod of the pressing cylinder 6 extends and retracts in the piston rod through hole. The end of the piston rod is fixed with a pressing plate. When the piston rod extends, the pressing plate can press the right end of the pressing rod 3 downward. The pressing cylinder 6 is switched by a foot switch. The positioning seat 1 is provided with a top block accommodating hole 8 on the right side. An elastic top block 7 and a spring 9 are installed in the top block accommodating hole 8. The spring 9 is a cylindrical helical spring. The elastic top block 7 is located above the spring 9 and the bottom of the elastic top block 7 is in contact with the spring 9. The elastic top block 7 is cylindrical and is matched with the top block accommodating hole 8. The elastic top block 7 is slidingly connected in the top block accommodating hole 8, and the elastic top block 7, the spring 9 and the top block accommodating hole 8 are coaxial. The elastic top block 7 corresponds to the right end of the pressing rod 3 and presses the bottom of the pressing rod 3. The elastic top block 7 is slightly deviated from the position of the piston rod through hole, so the contact position of the pressing plate on the pressing rod 3 and the contact position of the elastic top block 7 on the pressing rod 3 are axially deviated. Different from embodiment 1, the back of the positioning seat 1 is provided with two screw rod connecting holes in this embodiment. The two screw rod connecting holes are blind holes and are symmetrically arranged on the two sides of the V-shaped groove 2. Screw rods are threadedly connected in the screw rod connecting holes. The length of the screw rod is greater than the depth of the screw rod connecting hole. The screw rod is exposed on the back of the positioning seat 1. The exposed ends of the screw rods on the back of the positioning seat 1 are connected with an axial end abutment 15. Each screw rod is provided with two nuts on the exposed segment on the back of the positioning seat 1, and the two nuts are respectively located on the front and rear surfaces of the axial end abutment 15, so as to clamp the axial end abutment 15 in the middle. The axial end abutment 15 is located on the extended line of the axis of the V-shaped groove 2. The rest is the same as embodiment 1.

[0035] The shaft type pneumatic pressing drilling clamp is arranged below the drill bit of the drilling machine. When the radial hole of the round shaft workpiece 12 is drilled, the operation steps are as follows: first, the round shaft workpiece 12 is placed in the V-shaped groove 2 of the positioning seat 1. The axial direction of the round shaft workpiece 12 is parallel to the axial direction of the V-shaped groove 2. The two inclined groove walls of the V-shaped groove 2 abut against the circumferential surface of the round shaft workpiece 12; according to the drilling position, the nuts on the screw rods are loosened, the axial position of the axial end abutment 15 is adjusted, and then the axial end abutment 15 is clamped again, so as to change the distance between the axial end abutment 15 and the positioning seat 1 and push the round shaft workpiece 12 until the end surface of the round shaft workpiece 12 abuts against the axial end abutment; then the foot switch is pressed, the pressing cylinder 6 pushes the pressing rod 3 to press the round shaft workpiece 12; the drilling machine is started, the drill bit penetrates through the drill sleeve 5, and the round shaft workpiece 12 is drilled; after the drilling is completed, the pressing cylinder 6 is reset, the pressing rod 3 is loosened, and the round shaft workpiece 12 is pulled out.

Claims

1. A shaft type pneumatic pressurized hole clamping jig, characterized by, The utility model relates to a positioning seat (1), which is provided with a V-shaped groove (2) and a pressing rod (3) hinged on the top of the positioning seat (1), and the top of the positioning seat (1) is provided with a top plate (4) arranged in the air, the top plate (4) is provided with a drill sleeve (5) corresponding to the V-shaped groove (2) and a pressing cylinder (6) capable of pressing the pressing rod (3).

2. The shaft type pneumatic pinch drill jig according to claim 1, wherein One end of the pressing rod (3) is hinged on the positioning seat (1), and the other end corresponds to the pressing cylinder (6) and is provided with an elastic top block (7) below the end.

3. The shaft type pneumatic pinch drill jig according to claim 2, wherein The positioning seat (1) is provided with a top block containing hole (8), the top block containing hole (8) is provided with a spring (9) inside, and the elastic top block (7) is adapted to be placed in the top block containing hole (8) and located above the spring (9).

4. The shaft type pneumatic pinch drill jig according to claim 1, wherein The positioning seat (1) and the top plate (4) are provided with a pad block therebetween, and the positioning seat (1) and the top plate (4) are connected through bolts.

5. The shaft type pneumatic pinch drill chuck according to claim 1, wherein The top plate (4) is provided with a drill sleeve hole (10), the drill sleeve (5) is in a cylindrical shape and is provided with a flange at the top, and the drill sleeve (5) is adapted to be inserted into the drill sleeve hole (10).

6. The shaft type pneumatic pinch drill chuck according to claim 1, wherein The positioning seat (1) is provided with an axial end abutment, which is located on the axial extension line of the V-shaped groove (2).

7. The shaft type pneumatic pinch drill chuck according to claim 1, wherein The groove wall angle of the V-shaped groove (2) is 50-70 degrees.

8. The shaft type pneumatic pinch drill jig according to any one of claims 1 to 7, characterized by, The bottom surface of the pressing rod (3) is provided with an arc-shaped concave surface (11).

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