Four-claw backward-pulling double-clamping fixture

Abstract

The utility model relates to the technical field of machining, in particular to a four-claw backward-pulling double-clamping fixture. After the first end face of the shell is roughly positioned through the positioning jig, the driving part synchronously drives the four clamping jaws to press and position the first end face of the shell on the positioning jig, and the other power source drives the connecting rod to drive the collet part to clamp and position the second end face of the shell. And the clamping deformation is smaller, the precision after machining is higher, it is guaranteed that the machining allowance of subsequent procedures is smaller and more uniform, and the machining efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a four-jaw back-pull double-clamping fixture. Background Art

[0002] Existing metal cutting processing methods, especially turning, generally use three-jaw or four-jaw chucks as clamping parts. The radial movement of multiple jaws evenly distributed on the chuck body is used to clamp and position the workpiece. The rotation center of the workpiece can be determined based on the circumference of the clamping part of the workpiece. Therefore, three-jaw or four-jaw chucks of various specifications are used in large quantities.

[0003] Traditional oblique-pull chucks generally use jaws to clamp the side of the workpiece. Due to the gap between the sliding mating surfaces and the force deformation of the jaws, the parallelism and coaxiality of the workpiece after processing are too large, and the accuracy is poor. At the same time, a single clamping fixture can also make the workpiece extremely susceptible to pressure damage caused by sliding contact during processing, affecting the processing quality of the workpiece. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a four-jaw rear-pull double-clamping fixture with smaller clamping deformation, higher precision after processing, and smaller and more uniform processing allowances in subsequent processes.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A four-jaw pull-back double-clamping fixture, comprising:

[0007] A base, on which four base blocks are evenly arranged, and the four base blocks are arranged to form a positioning station;

[0008] A positioning jig is provided on the positioning station, the positioning jig is connected to the base block, and is used to position the first end surface of the shell;

[0009] A clamping assembly is provided on the base, the clamping assembly includes four pull rods, an oblique pull hole is provided on the base, the pull rods are passed through the oblique pull hole, a clamping claw is provided on the free end of the pull rod, the driving end of the pull rod is connected to the driving component, and the driving component is used to synchronously drive the four clamping claws to press the first end surface of the shell onto the positioning fixture;

[0010] A positioning assembly is arranged on the base, and the positioning assembly includes a connecting rod and a collet component. The connecting rod is drivingly connected to the collet component, and the connecting rod is connected to the driving component. The connecting rod is used to drive the collet component to clamp and position the second end face of the shell.

[0011] In one embodiment of the present utility model, the collet component includes a tapered body and a collet, a guide slope is provided on the edge of the tapered body, each clamping arm of the collet is provided with a clamping slope, the clamping slope is connected to the guide slope, a clamping block is provided on the clamping arm, and the connecting rod is connected to the collet.

[0012] In one embodiment of the present invention, a cleaning hole is provided on the connecting rod, a cleaning cylinder is provided on the cleaning hole, an air inlet nozzle is provided at one end of the cleaning cylinder, and an air outlet block is provided at the other end, a plurality of air outlet holes are evenly provided on the air outlet block, the air outlet block is passed through the collet, and is coaxially arranged with the collet.

[0013] In one embodiment of the present invention, a support tube is further included, which is sleeved on the air outlet block, and a slide groove is provided on the support tube. The outer wall of the air outlet block is slid on the slide groove, and at least one support ring is provided on the support tube, and the support ring is connected to the second end face of the shell.

[0014] In one embodiment of the present utility model, the driving component includes a clamping frame, a guide hole is opened on the base, the clamping frame is slidably arranged in the guide hole, the clamping frame is connected to the pull rod, an end plate is provided on the base, a guide hole is provided on the end plate, a drive shaft is provided on the clamping frame, and the drive shaft is passed through the guide hole.

[0015] In one embodiment of the present invention, an annular groove is provided on the outer side wall of the clamping frame, a mounting block is provided on the pull rod, a clamping groove is provided on the mounting block, and the clamping groove is clamped on the edge protrusion of the annular groove.

[0016] In one embodiment of the present invention, a sliding hole is provided on the clamping frame, the connecting rod is passed through the sliding hole, a limiting ring is provided on the connecting rod, the limiting ring is arranged opposite to the clamping frame, and an air flow channel is provided in the connecting rod.

[0017] In one embodiment of the present invention, the clamping jaw includes a clamping block, a clamping surface is provided on the clamping block, a supporting block is provided on the clamping block, a positioning surface is provided on the supporting block, and the positioning surface and the clamping surface are arranged in a stepped shape.

[0018] In one embodiment of the present invention, the positioning jig includes a jig ring, on which four reference blocks are provided, the reference blocks are arranged in one-to-one correspondence with the clamping jaws, the reference blocks are provided with reference air holes, and the jig ring is provided with positioning pins.

[0019] In one embodiment of the present invention, a limiting member is further included, which is connected to the base. A limiting hole is provided on the side wall of the base. A limiting rod is passed through the limiting hole. The limiting rod is connected to the limiting member. A limiting groove is provided on the pull rod, and the end of the limiting rod is passed through the limiting groove.

[0020] Beneficial effects of the utility model:

[0021] After the utility model roughly positions the first end face of the shell by using the positioning fixture, the driving component synchronously drives the four clamping claws to press and position the first end face of the shell on the positioning fixture, and another power source drives the connecting rod to drive the collet component to clamp and position the second end face of the shell. Compared with the traditional single clamping fixture, the clamping deformation is smaller and the processing accuracy is higher, which ensures that the processing allowance of subsequent processes is smaller and more uniform, and the processing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a four-jaw rear-pull double-clamping fixture of the present invention.

[0023] Figure 2 It is a cross-sectional view of the present utility model.

[0024] Explanation of the numbers in the figure: 1. Base; 11. Base block; 13. Limiting member; 14. End plate; 15. Limiting rod; 16. Limiting groove; 2. Clamping claw; 3. Fixture ring; 31. Locating pin; 32. Reference block; 33. Reference hole; 4. Positioning assembly; 41. Collet; 42. Clamping arm; 43. Taper body; 44. Guide slope; 45. Connecting rod; 46. Limiting ring; 47. Air flow channel; 48. Cleaning cylinder; 49. Air inlet nozzle; 491. Air outlet block; 492. Support cylinder; 493. Support ring platform; 5. Shell; 51. First end face; 52. Second end face; 6. Pull rod; 61. Oblique pulling hole; 62. Clamping frame; 63. Annular groove; 64. Card groove; 65. Drive shaft. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0026] Reference Figure 1-2 As shown, a four-jaw pull-back double-gripping fixture includes:

[0027] A base 1 is provided with four base blocks 11 evenly arranged thereon, and the four base blocks 11 are arranged to form a positioning station;

[0028] A positioning jig is provided on the positioning station, the positioning jig is connected to the base block 11, and is used to position the first end surface 51 of the housing 5;

[0029] A clamping assembly is provided on the base 1, comprising four pull rods 6. An oblique pull hole is provided on the base 1, and the pull rods 6 are inserted into the oblique pull hole 61. A clamping jaw 2 is provided on the free end of the pull rod 6. The driving end of the pull rod 6 is connected to a driving component, and the driving component is used to synchronously drive the four clamping jaws 2 to press the first end surface 51 of the shell 5 onto the positioning fixture;

[0030] The positioning assembly 4 is arranged on the base 1. The positioning assembly 4 includes a connecting rod 45 and a collet component. The connecting rod 45 is drivingly connected to the collet component. The connecting rod 45 is connected to the driving component. The connecting rod 45 is used to drive the collet component to clamp and position the second end surface 52 of the shell 5.

[0031] After the utility model roughly positions the first end face 51 of the shell 5 by the positioning fixture, the driving component synchronously drives the four clamping jaws 2 to press and position the first end face 51 of the shell 5 on the positioning fixture, and another power source drives the connecting rod 45 to drive the collet component to clamp and position the second end face 52 of the shell 5. Compared with the traditional single clamping fixture, the clamping deformation is smaller and the processing accuracy is higher, which ensures that the processing allowance of the subsequent process is smaller and more uniform, and the processing efficiency is higher.

[0032] In one embodiment of the present utility model, the collet component includes a tapered body 43 and a collet 41, and a guide slope 44 is provided on the edge of the tapered body 43. Each clamping arm 42 of the collet 41 is provided with a clamping slope, and the clamping slope is connected to the guide slope 44. A clamping block is provided on the clamping arm 42, and the connecting rod 45 is connected to the collet 41.

[0033] Specifically, another power source drives the connecting rod 45 to move away from the jig ring 3, so that the clamping bevel on the collet 41 and the guide bevel 44 of the tapered body 43 move relative to each other, so that the clamping block on the clamping arm 42 clamps and positions the second end face 52 of the shell 5. It is driven by a dual power source, and the pull rod 6 pulls back along the inclined hole 61 for the four-claw main clamping, and the collet 41 performs auxiliary clamping to reduce clamping deformation and improve clamping accuracy.

[0034] In one embodiment of the present utility model, a cleaning hole is provided on the connecting rod 45, and a cleaning cylinder 48 is provided on the cleaning hole. An air inlet nozzle 49 is provided at one end of the cleaning cylinder 48, and an air outlet block 491 is provided at the other end. A plurality of air outlet holes are evenly provided on the air outlet block 491. The air outlet block 491 is passed through the collet 41 and is coaxially arranged with the collet 41.

[0035] Specifically, the air inlet nozzle 49 is connected to the air flow channel 47, and a plurality of air outlet holes are evenly arranged on the air outlet block 491. When dry processing is performed, air is blown, and when wet processing is performed, cutting fluid is sprayed, which can ensure rapid processing of the shell 5.

[0036] In one embodiment of the present invention, it also includes a support cylinder 492, which is sleeved on the air outlet block 491, and a slide groove is provided on the support cylinder 492. The outer wall of the air outlet block 491 is slid on the slide groove, and at least one support ring 493 is provided on the support cylinder 492. The support ring 493 is connected to the second end face 52 of the shell 5, and a spring is provided between the support cylinder 492 and the base 1, so that the support ring 493 can always abut against the shell 5.

[0037] Specifically, the second end face 52 of the shell 5 passes through the jig ring 3 and abuts against the support ring platform 493 on the support tube 492, and pushes the support tube 492 to slide on the air outlet block 491 away from the jig ring 3, thereby guiding the sliding of the shell 5. The air outlet block 491 is coaxially arranged with the collet 41 to pre-position the second end face 52 of the shell 5 to ensure the subsequent clamping accuracy.

[0038] In one embodiment of the present utility model, the driving component includes a clamping frame 62, a guide hole is opened on the base 1, the clamping frame 62 is slidably arranged in the guide hole, the clamping frame 62 is connected to the pull rod 6, an end plate 14 is provided on the base 1, a guide hole is provided on the end plate 14, a driving shaft 65 is provided on the clamping frame 62, and the driving shaft 65 is passed through the guide hole.

[0039] In one embodiment of the present invention, an annular groove 63 is provided on the outer wall of the clamping frame 62 , a mounting block is provided on the pull rod 6 , and a clamping groove 64 is provided on the mounting block. The clamping groove 64 is clamped on the edge protrusion of the annular groove 63 .

[0040] Specifically, the power source drives the power frame to move toward the jig ring 3, driving multiple pull rods 6 to move toward the jig ring 3, which can ensure that multiple pull rods 6 move synchronously, so that they can synchronously press and position the first end face 51 of the shell 5, greatly improving the clamping stability.

[0041] In one embodiment of the present utility model, a sliding hole is provided on the clamping frame 62, the connecting rod 45 is passed through the sliding hole, a limiting ring 46 is provided on the connecting rod 45, the limiting ring 46 is arranged opposite to the clamping frame 62, and an air flow channel 47 is provided in the connecting rod 45.

[0042] Specifically, the limiting ring 46 is disposed opposite to the clamping frame 62 to limit the movement stroke of the collet 41 , thereby ensuring maximum clamping force on the second end surface 52 of the housing 5 and ensuring stability during processing.

[0043] In one embodiment of the present invention, the clamping jaw 2 includes a clamping block, a clamping surface is provided on the clamping block, a supporting block is provided on the clamping block, a positioning surface is provided on the supporting block, and the positioning surface and the clamping surface are arranged in a stepped shape.

[0044] Specifically, the positioning surfaces or clamping surfaces on the four clamping jaws 2 are clamped with the first end surface 51 of the shell 5. The positioning surfaces and the clamping surfaces can be used to clamp shells 5 of different specifications, and have a wide range of applications. At the same time, the positioning surfaces and the clamping surfaces are arranged in a stepped shape, and the support block can also play a certain supporting role for shells 5 of larger specifications. The structure is simple and reasonable.

[0045] In one embodiment of the present invention, the positioning jig includes a jig ring 3, and four reference blocks 32 are provided on the jig ring 3. The reference blocks 32 are arranged in a one-to-one correspondence with the clamping jaws 2, and the reference provides the same clamping surface to ensure the synchronous clamping effect of the first end face 51 of the shell 5 to avoid deformation and other problems. The reference block 32 is provided with a reference air hole, and the jig ring 3 is provided with a positioning pin 31.

[0046] Specifically, the first end face 51 of the shell 5 is connected to the positioning pin 31, and the first end face 51 of the shell 5 is connected to the four reference blocks 32, so as to quickly position the first end face 51 of the shell 5, and the positioning fixture can be pre-positioned to ensure the accuracy of subsequent processing.

[0047] In one embodiment of the present utility model, a limiting member 13 is further included, and the limiting member 13 is connected to the base 1. A limiting hole is provided on the side wall of the base 1, and a limiting rod 15 is passed through the limiting hole. The limiting rod 15 is connected to the limiting member 13, and a limiting groove 16 is provided on the pull rod 6. The end of the limiting rod 15 is passed through the limiting groove 16.

[0048] Specifically, the end of the limit rod 15 is passed through the limit groove 16. When the pull rod 6 slides on the inclined pull hole 61, the pull rod 6 can move a certain distance toward the jig ring 3. The two side surfaces of the limit groove 16 can abut against the limit rod 15, thereby limiting the moving stroke of the pull rod 6, ensuring the maximum clamping force on the shell 5, avoiding deformation of the shell 5 caused by excessive clamping force, and the limit adjustment operation is simple and fast.

[0049] Usage process

[0050] The fixture is loaded onto the processing equipment, and the connecting rod 45 and the drive shaft 65 are respectively connected to two reciprocating power sources (cylinders, oil cylinders, etc.), and the differential housing 5 is placed on the fixture. The second end face 52 of the housing 5 passes through the jig ring 3 and abuts against the support ring platform 493 on the support cylinder 492, and pushes the support cylinder 492 to slide on the air outlet block 491 away from the jig ring 3, thereby guiding the housing 5 to slide until the second end face 52 of the housing 5 is connected to the collet 41, and the first end face 51 of the housing 5 is connected to the positioning pin 31. At the same time, the first end face 51 of the housing 5 is connected to the four reference blocks 32. A power source pulls the power frame to move in the direction away from the jig ring 3, so that the pull rod 6 moves along the inclined hole 61 to This drives the four jaws 2 to move toward the first end face 51 of the shell 5 until the positioning surfaces or clamping surfaces on the four jaws 2 are clamped with the first end face 51 of the shell 5. Another power source drives the connecting rod 45 to move away from the jig ring 3, so that the clamping bevel on the collet 41 and the guide bevel 44 of the tapered body 43 move relative to each other, so that the clamping block on the clamping arm 42 clamps and positions the second end face 52 of the shell 5. A plurality of air outlet holes are evenly arranged on the air outlet block 491. When dry processing is performed, air is blown, and when wet processing is performed, cutting fluid is sprayed. Double action and double clamping are adopted. Compared with traditional single clamping fixtures, the clamping deformation is smaller and the precision after processing is higher; it ensures that the processing allowance of subsequent processes is smaller and more uniform, and the processing efficiency is higher.

[0051] The above-described embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. A four-jaw pull-back double-clamping fixture, characterized in that: include: A base, on which four base blocks are evenly arranged, and the four base blocks are arranged to form a positioning station; A positioning jig is provided on the positioning station, the positioning jig is connected to the base block, and is used to position the first end surface of the shell; A clamping assembly is provided on the base, the clamping assembly includes four pull rods, an oblique pull hole is provided on the base, the pull rods are passed through the oblique pull hole, a clamping claw is provided on the free end of the pull rod, the driving end of the pull rod is connected to the driving component, and the driving component is used to synchronously drive the four clamping claws to press the first end surface of the shell onto the positioning fixture; A positioning assembly is arranged on the base, and the positioning assembly includes a connecting rod and a collet component. The connecting rod is drivingly connected to the collet component, and the connecting rod is connected to the driving component. The connecting rod is used to drive the collet component to clamp and position the second end face of the shell.

2. The four-jaw pull-back double-clamping fixture according to claim 1, characterized in that: The collet component includes a tapered body and a collet, a guide slope is provided on the edge of the tapered body, each clamping arm of the collet is provided with a clamping slope, the clamping slope is connected to the guide slope, a clamping block is provided on the clamping arm, and the connecting rod is connected to the collet.

3. The four-jaw pull-back double-clamping fixture according to claim 2, characterized in that: A cleaning hole is provided on the connecting rod, a cleaning cylinder is provided on the cleaning hole, an air inlet nozzle is provided at one end of the cleaning cylinder, and an air outlet block is provided at the other end. A plurality of air outlet holes are evenly provided on the air outlet block, and the air outlet block is passed through the collet and coaxially arranged with the collet.

4. The four-jaw pull-back double-clamping fixture according to claim 3, characterized in that: It also includes a support tube, which is sleeved on the air outlet block, and a slide groove is provided on the support tube. The outer wall of the air outlet block is slid on the slide groove. The support tube is provided with at least one support ring platform, and the support ring platform is connected to the second end face of the shell.

5. The four-jaw pull-back double-clamping fixture according to claim 1, characterized in that: The driving component includes a clamping frame, a guide hole is opened on the base, the clamping frame is slidably arranged in the guide hole, the clamping frame is connected to the pull rod, an end plate is provided on the base, a guide hole is provided on the end plate, a driving shaft is provided on the clamping frame, and the driving shaft is passed through the guide hole.

6. The four-jaw pull-back double-clamping fixture according to claim 5, characterized in that: An annular groove is provided on the outer side wall of the clamping frame, a mounting block is provided on the pull rod, and a clamping groove is provided on the mounting block. The clamping groove is clamped on the edge protrusion of the annular groove.

7. The four-jaw pull-back double-clamping fixture according to claim 5, characterized in that: The clamping frame is provided with a sliding hole, the connecting rod is passed through the sliding hole, a limiting ring is provided on the connecting rod, the limiting ring is arranged opposite to the clamping frame, and an air flow channel is provided in the connecting rod.

8. The four-jaw pull-back double-clamping fixture according to claim 1, characterized in that: The clamping jaw comprises a clamping block, a clamping surface is provided on the clamping block, a supporting block is provided on the clamping block, a positioning surface is provided on the supporting block, and the positioning surface and the clamping surface are arranged in a stepped shape.

9. The four-jaw pull-back double-clamping fixture according to claim 1, characterized in that: The positioning jig includes a jig ring, on which four reference blocks are arranged, the reference blocks are arranged in one-to-one correspondence with the clamping jaws, the reference blocks are provided with reference air holes, and the jig ring is provided with positioning pins.

10. The four-jaw pull-back double-clamping fixture according to claim 1, characterized in that: It also includes a limiting piece, which is connected to the base. A limiting hole is opened on the side wall of the base. A limiting rod is passed through the limiting hole. The limiting rod is connected to the limiting piece. A limiting groove is set on the pull rod. The end of the limiting rod is passed through the limiting groove.

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