Four jaw back pull double grip fixture

Abstract

The present application relates to the technical field of machining, and relates to a four-jaw rear-pulling double-clamping fixture. After the first end face of a shell is coarsely positioned by a positioning jig, a driving component synchronously drives four clamping claws to press and position the first end face of the shell on the positioning jig, and another power source drives a connecting rod to drive a collet component to clamp and position the second end face of the shell. Compared with a traditional single-clamping fixture, the double-clamping fixture has smaller clamping deformation, higher machining precision, smaller and more uniform machining allowance for subsequent processes, and higher machining efficiency.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and specifically to a four-jaw pullback double clamping fixture. Background Technology

[0002] Existing metal cutting methods, especially turning, commonly use three-jaw or four-jaw chucks as clamping devices. The workpiece is clamped and positioned by the radial movement of multiple jaws evenly distributed on the chuck body. The rotation center of the workpiece can be determined according to the circumference of the workpiece clamping part. Therefore, the usage of various specifications of three-jaw or four-jaw chucks is very large.

[0003] Traditional inclined chucks typically clamp the workpiece from the side using jaws. Due to the clearance between the sliding mating surfaces and the deformation of the jaws under stress, the parallelism and coaxiality of the workpiece after machining are too large, resulting in poor accuracy. At the same time, single-clamp fixtures can also cause the workpiece to easily slide and make pressure marks during machining, affecting the machining quality of the workpiece. Summary of the Invention

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

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

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

[0007] The base has four base blocks evenly arranged on it, and the four base blocks form a positioning station.

[0008] A positioning fixture is provided at the positioning station. The positioning fixture is connected to the base block and is used to position the first end face of the housing.

[0009] A clamping assembly is disposed on the base. The clamping assembly includes four pull rods. The base is provided with guide holes. The pull rods pass through the inclined pull holes. The free ends of the pull rods are provided with grippers. The driving ends of the pull rods are driven to be connected to a driving component. The driving component is used to synchronously drive the four grippers to press and position the first end face of the housing on the positioning fixture.

[0010] A positioning component is disposed on the base. The positioning component includes a connecting rod and a collet component. The connecting rod is driven to the collet component and 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 housing.

[0011] In one embodiment of the present invention, the collet component includes a tapered body and a collet, a guide slope is provided on the edge of the tapered body, a clamping slope is provided on each clamping arm of the collet, the clamping slope is connected to the guide slope, a clamping block is provided on the clamping arm, and a 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 is provided at one end of the cleaning cylinder, an air outlet is provided at the other end, a plurality of air outlet holes are evenly provided on the air outlet, the air outlet is inserted through the collet and is coaxially arranged with the collet.

[0013] In one embodiment of the present invention, a support cylinder is further included, the support cylinder being sleeved on the air outlet block, the support cylinder being provided with a sliding groove, the outer side wall of the air outlet block being slidably disposed on the sliding groove, and the support cylinder being provided with at least one support ring platform, the support ring platform being connected to the second end face of the housing.

[0014] In one embodiment of the present invention, the driving component includes a clamping frame, a guide hole is provided on the base, the clamping frame is slidably disposed 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 passes 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, an mounting block is provided on the pull rod, and a slot is provided on the mounting block, which is engaged with the edge protrusion of the annular groove.

[0016] In one embodiment of the present invention, the clamping frame is provided with a sliding hole, the connecting rod passes through the sliding hole, a limiting ring is provided on the connecting rod, the limiting ring is disposed opposite to the clamping frame, and an airflow channel is provided inside the connecting rod.

[0017] In one embodiment of the present invention, the gripper includes a gripping block, the gripping block is provided with a gripping surface, the gripping block is provided with a support block, the support block is provided with a positioning surface, and the positioning surface and the gripping surface are arranged in a stepped manner.

[0018] In one embodiment of the present invention, the positioning fixture includes a fixture ring, on which four reference blocks are provided, each reference block corresponding to one of the grippers, each reference block having a reference air hole, and the fixture ring having a positioning pin.

[0019] In one embodiment of the present invention, a limiting member is further included. The limiting member is connected to the base. A limiting hole is formed 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. The end of the limiting rod passes through the limiting groove.

[0020] The beneficial effects of this invention are:

[0021] This invention uses a positioning fixture to roughly position the first end face of the housing. Then, the driving component simultaneously drives four grippers to press and position the first end face of the housing onto the positioning fixture. Another power source drives the connecting rod to clamp and position the second end face of the housing. Compared with traditional single-clamp fixtures, the clamping deformation is smaller, the machining accuracy is higher, and the machining allowance of subsequent processes is smaller and more uniform, resulting in higher machining efficiency. Attached Figure Description

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

[0023] Figure 2 This is a cross-sectional view of the present invention.

[0024] The following are the labeling instructions in the diagram: 1. Base; 11. Base block; 13. Limiting component; 14. End plate; 15. Limiting rod; 16. Limiting groove; 2. Gripper; 3. Fixture ring; 31. Positioning pin; 32. Reference block; 33. Reference hole; 4. Positioning assembly; 41. Collet; 42. Grip arm; 43. Tapered body; 44. Guide slope; 45. Connecting rod; 46. Limiting ring; 47. Airflow channel; 48. Cleaning cylinder; 49. Air inlet; 491. Air outlet block; 492. Support cylinder; 493. Support ring platform; 5. Housing; 51. First end face; 52. Second end face; 6. Pull rod; 61. Slanted pull hole; 62. Clamping frame; 63. Annular groove; 64. Slot; 65. Drive shaft. Detailed Implementation

[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 and implement the present invention. However, the embodiments described are not intended to limit the present invention.

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

[0027] The base 1 has four base blocks 11 evenly arranged on it, and the four base blocks 11 surround the positioning station.

[0028] A positioning fixture is provided on the positioning station. The positioning fixture is connected to the base block 11. The positioning fixture is used to position the first end face 51 of the housing 5.

[0029] A clamping assembly is disposed on the base 1. The clamping assembly includes four pull rods 6. The base 1 is provided with guide holes. The pull rods 6 pass through the inclined pull holes 61. The free end of the pull rod 6 is provided with a gripper 2. The driving end of the pull rod 6 is drivenly connected to a driving component. The driving component is used to synchronously drive the four grippers 2 to press and position the first end face 51 of the housing 5 on the positioning fixture.

[0030] Positioning component 4 is disposed on the base 1. Positioning component 4 includes a connecting rod 45 and a collet component. The connecting rod 45 is drivenly connected to the collet component and is connected to the driving component. The connecting rod 45 is used to drive the collet component to clamp and position the second end face 52 of the housing 5.

[0031] In this invention, after the first end face 51 of the housing 5 is roughly positioned by the positioning fixture, the driving component simultaneously drives the four grippers 2 to press and position the first end face 51 of the housing 5 on the positioning fixture. Another power source drives the connecting rod 45 to drive the collet component to clamp and position the second end face 52 of the housing 5. Compared with the traditional single clamping fixture, the clamping deformation is smaller, the machining accuracy is higher, and the machining allowance of subsequent processes is smaller and more uniform, resulting in higher machining efficiency.

[0032] In one embodiment of the present invention, the collet component includes a tapered body 43 and a collet 41. 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. The clamping slope is connected to the guide slope 44. A clamping block is provided on the clamping arm 42. 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 fixture ring 3, causing the clamping inclined surface on the collet 41 to move relative to the guide inclined surface 44 of the tapered body 43, so that the clamping block on the clamping arm 42 clamps and positions the second end face 52 of the housing 5. With dual power source drive, the pull rod 6 pulls back along the inclined pull hole 61 to hold the four-jaw main clamp, and the collet 41 performs auxiliary clamping, reducing clamping deformation and improving clamping accuracy.

[0034] In one embodiment of the present invention, a cleaning hole is provided on the connecting rod 45, and a cleaning cylinder 48 is provided on the cleaning hole. An air inlet 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 passes through the collet 41 and is coaxially arranged with the collet 41.

[0035] Specifically, the air inlet 49 is connected to the airflow channel 47, and multiple air outlets are evenly arranged on the air outlet block 491. During dry machining, air is blown, and during wet machining, cutting fluid is sprayed, which can ensure rapid machining of the housing 5.

[0036] In one embodiment of the present invention, a support cylinder 492 is further included. The support cylinder 492 is sleeved on the air outlet block 491. The support cylinder 492 is provided with a sliding groove. The outer side wall of the air outlet block 491 is slidably disposed on the sliding groove. At least one support ring platform 493 is provided on the support cylinder 492. The support ring platform 493 is connected to the second end face 52 of the housing 5. A spring is provided between the support cylinder 492 and the base 1 so that the support ring platform 493 can always abut against the housing 5.

[0037] Specifically, 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, pushing the support cylinder 492 to slide away from the jig ring 3 on the air outlet block 491, thereby guiding the housing 5 to slide. The air outlet block 491 is coaxially arranged with the collet 41 to pre-position the second end face 52 of the housing 5, ensuring the subsequent clamping accuracy.

[0038] In one embodiment of the present invention, the driving component includes a clamping frame 62, a guide hole is provided on the base 1, the clamping frame 62 is slidably disposed 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, and a driving shaft 65 is provided on the clamping frame 62, the driving shaft 65 passes through the guide hole.

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

[0040] Specifically, the power source drives the power frame to move in the direction of the fixture ring 3, which in turn drives multiple pull rods 6 to move in the direction of the fixture ring 3. This ensures that the multiple pull rods 6 move synchronously, so that they can simultaneously clamp and position the first end face 51 of the housing 5, which greatly improves the clamping stability.

[0041] In one embodiment of the present invention, the clamping frame 62 is provided with a sliding hole, the connecting rod 45 passes through the sliding hole, the connecting rod 45 is provided with a limiting ring 46, the limiting ring 46 is disposed opposite to the clamping frame 62, and the connecting rod 45 is provided with an airflow channel 47.

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

[0043] In one embodiment of the present invention, the gripper 2 includes a gripping block, a gripping surface is provided on the gripping block, a support block is provided on the gripping block, and a positioning surface is provided on the support block. The positioning surface and the gripping surface are arranged in a stepped manner.

[0044] Specifically, the positioning or clamping surfaces on the four grippers 2 are clamped to the first end face 51 of the housing 5. The positioning and clamping surfaces can clamp housings 5 ​​of different specifications, making it widely applicable. At the same time, the positioning and clamping surfaces are arranged in a stepped manner, and the support block can also provide some support for larger housings 5. The structure is simple and reasonable.

[0045] In one embodiment of the present invention, the positioning fixture includes a fixture ring 3, on which four reference blocks 32 are provided. The reference blocks 32 are provided in a one-to-one correspondence with the grippers 2. The references provide the same clamping surface to ensure the synchronous clamping effect on the first end face 51 of the housing 5 and avoid problems such as deformation. The reference blocks 32 are provided with reference air holes, and the fixture ring 3 is provided with positioning pins 31.

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

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

[0048] Specifically, the end of the limiting rod 15 passes through the limiting groove 16. When the pull rod 6 slides on the inclined pull hole 61, it can move a certain distance toward the jig ring 3. The two sides of the limiting groove 16 can abut against the limiting rod 15 to limit the movement of the pull rod 6, ensuring the maximum clamping force on the housing 5 and avoiding excessive clamping force that could cause deformation of the housing 5. The limiting adjustment operation is simple and quick.

[0049] Usage process

[0050] The fixture is loaded onto the machining equipment. The connecting rod 45 and the drive shaft 65 are respectively connected to two reciprocating power sources (cylinders, hydraulic cylinders, etc.). The differential housing 5 is placed on the fixture. The second end face 52 of the housing 5 passes through the fixture ring 3 and abuts against the support ring platform 493 on the support cylinder 492, pushing the support cylinder 492 to slide away from the fixture ring 3 on the air outlet block 491, thereby guiding the housing 5 to slide until the second end face 52 of the housing 5 is connected to the collet 41. 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 four reference blocks 32. One power source pulls the power frame to move away from the fixture ring 3, so that the pull rod 6 moves along the inclined pull hole 61 to... This causes the four grippers 2 to move toward the first end face 51 of the housing 5 until the positioning or clamping surfaces on the four grippers 2 are clamped to the first end face 51 of the housing 5. Then, another power source drives the connecting rod 45 to move away from the fixture ring 3, so that the clamping inclined surface on the collet 41 moves relative to the guide inclined surface 44 of the tapered body 43, so that the clamping block on the clamping arm 42 clamps and positions the second end face 52 of the housing 5. The air outlet block 491 is evenly provided with multiple air outlet holes. When dry machining is performed, air is blown; when wet machining is performed, cutting fluid is sprayed. The double action and double clamping are adopted. Compared with the traditional single clamping fixture, the clamping deformation is smaller and the machining accuracy is higher. It ensures that the machining allowance of subsequent processes is smaller and more uniform, and the machining efficiency is higher.

[0051] The above-described embodiments are merely preferred embodiments provided to fully illustrate 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 all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A four-jaw pull-back double-clamping fixture, characterized in that, include: The base has four base blocks evenly arranged on it, and the four base blocks form a positioning station. A positioning fixture is provided at the positioning station. The positioning fixture is connected to the base block and is used to position the first end face of the housing. A clamping assembly is disposed on the base. The clamping assembly includes four pull rods. The base is provided with inclined pull holes. The pull rods pass through the inclined pull holes. The free ends of the pull rods are provided with grippers. The driving ends of the pull rods are driven to be connected to a driving component. The driving component is used to synchronously drive the four grippers to press and position the first end face of the housing on the positioning fixture. A positioning component is disposed on the base. The positioning component includes a connecting rod and a collet component. The connecting rod is driven to the collet component and 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 housing. 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. The connecting rod is connected to the collet. The connecting rod is provided with a cleaning hole, and a cleaning cylinder is provided on the cleaning hole. One end of the cleaning cylinder is provided with an air inlet, and the other end is provided with an air outlet block. Multiple air outlet holes are evenly provided on the air outlet block. The air outlet block passes through the collet and is coaxially arranged with the collet. It also includes a support cylinder, which is sleeved on the air outlet block. The support cylinder is provided with a sliding groove, and the outer side wall of the air outlet block slides on the sliding groove. The support cylinder is provided with at least one support ring platform, which is connected to the second end face of the housing. The driving component includes a clamping frame, a guide hole is provided on the base, the clamping frame is slidably disposed 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 passes through the guide hole; The outer side wall of the clamping frame is provided with an annular groove, the pull rod is provided with a mounting block, the mounting block is provided with a slot, and the slot is engaged with the edge protrusion of the annular groove; The clamping frame is provided with a sliding hole, the connecting rod passes through the sliding hole, the connecting rod is provided with a limit ring, the limit ring is disposed opposite to the clamping frame, and the connecting rod is provided with an airflow channel.

2. The four-jaw pullback double-clamping fixture as described in claim 1, characterized in that, The gripper includes a gripping block, a gripping surface, a support block, and a positioning surface. The positioning surface and the gripping surface are arranged in a stepped manner.

3. The four-jaw pullback double-clamping fixture as described in claim 1, characterized in that, The positioning fixture includes a fixture ring, on which four reference blocks are provided. Each reference block corresponds to one of the grippers. Reference air holes are provided on the reference blocks, and positioning pins are provided on the fixture ring.

4. The four-jaw pullback double-clamping fixture as described in claim 1, characterized in that, It also includes a limiting member, which is connected to the base. A limiting hole is provided on the side wall of the base, and a limiting rod is passed through the limiting hole. The limiting rod is connected to the limiting member, and a limiting groove is provided on the pull rod. The end of the limiting rod passes through the limiting groove.

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