Inner support positioning clamp

Abstract

The utility model provides an inner support positioning fixture, which comprises a plurality of groups of inner support positioning devices, each inner support positioning device consists of a positioning seat, a top plate, an inner cylinder, a piston, a positioning claw and a reset spring, three uniformly distributed sliding chutes are arranged on the positioning seat, the positioning claw is arranged in the sliding chutes, a through hole is arranged in the middle of the inner cylinder, the piston is divided into a piston ring and a piston rod, and the top plate is arranged on the piston ring. The piston ring divides a cavity formed by the inner cylinder and the positioning seat into an upper cavity and a lower cavity, an air inlet channel is formed in the positioning seat and communicated to the lower cavity, and the outer side face of the top of the piston rod is a conical face and makes contact with the inner side face of the positioning claw. The inner support positioning clamp is provided with the hollow structure, and a cutter can stretch into the hollow part to machine the bottom of a workpiece; the piston ascends to push the three positioning claws to synchronously extend out in the radial direction, and accurate positioning of the workpiece is achieved. And when the piston retreats, the positioning claw retreats to the inside, so that the workpiece is convenient to take and place.

Description

TECHNICAL FIELD

[0001] The utility model relates to a machine tool accessory of numerical control machining center especially relates to a workpiece's clamping, positioning device, concretely relates to a inside prop positioning fixture. BACKGROUND

[0002] The bowl-shaped part applied on certain new energy vehicles has different specifications, part has part structure in the bowl bottom needs processing on the machining center, and part structure outside the bowl wall also needs processing, part has higher processing precision requirement, in order to guarantee the position degree of part processing, need to do accurate positioning. In the usual processing, the outer cylindrical surface of part is used as the positioning reference for processing, but the outer cylindrical surface is the casting non-processing surface, and the precision cannot be guaranteed, leading to the low processing qualified rate. Therefore, it is needed to change to use the inner wall of the bowl for positioning, and the bowl bottom structure and the bowl wall external structure of the part can be processed in the same process to guarantee the position degree and coaxiality of the part, which needs a special fixture to position the inner hole of the workpiece. The current fixture for positioning the inner hole generally uses fixed positioning elements for positioning, due to the limited space, it will cause the difficulty in taking and placing the part, so the automatic feeding and discharging cannot be realized. The inside prop fixture is generally solid in the middle, and the processing of the bottom of the part cannot be realized. SUMMARY

[0003] In view of the above problems, the utility model aims at providing an inside prop positioning fixture, which can position the inner wall of the workpiece as the reference, process the bottom of the workpiece, and facilitate the taking and placing of the workpiece.

[0004] The solution of the utility model is: an inside prop positioning fixture, comprising a plurality of inside prop positioning devices, the inside prop positioning device is composed of a positioning seat, a top plate, an inner cylinder, a piston, a positioning claw and a reset device, three evenly distributed sliding grooves are formed in the positioning seat, the positioning claw is installed in the sliding groove, the top plate is fixed on the top of the positioning seat, the inner cylinder is installed in the inside of the positioning seat, a through hole is arranged in the middle of the inner cylinder, and the inner cylinder is fixedly connected with the bottom of the positioning seat to form a seal; the piston is installed between the positioning seat and the inner cylinder, the piston is divided into a piston ring and a piston rod, the piston ring divides the cavity formed by the inner cylinder and the positioning seat into an upper cavity and a lower cavity, and first sealing rings are installed on the inner and outer sides of the piston ring; an air inlet channel is formed in the positioning seat and connected to the lower cavity; the outer side surface of the top of the piston rod is a conical surface, the inner side surface of the positioning claw is in contact with the conical surface of the piston rod; the reset device is an elastic member, the positioning claw and the positioning seat are provided with an annular groove, and the elastic member is installed in the annular groove.

[0005] Further, the positioning seat is provided with a second sealing ring on the matching surface of the piston rod, and the positioning seat is provided with a second air inlet channel.

[0006] Further, the elastic member is two annular springs, the positioning claw is provided with two annular grooves on the positioning seat, and the annular spring is arranged in the annular groove.

[0007] Further, the positioning seat is provided with a second set of three evenly distributed sliding grooves, and a second positioning claw is arranged in the sliding groove, the inner side of the second positioning claw is in contact with the piston rod, and the top conical surface of the piston rod is provided with three evenly distributed grooves.

[0008] The inner support positioning clamp has a hollow structure, a tool can be inserted into the hollow part to process the bottom of a workpiece, and the external structure can be processed in the same process to ensure the position degree and coaxiality of the workpiece; during use, when the workpiece is placed in place, the air inlet channel drives the piston to rise, and the three positioning claws are synchronously extended along the radial direction to realize accurate positioning of the workpiece; after processing is completed, the air inlet channel becomes an air outlet channel, the piston rod retreats, and the three positioning claws retract due to the elastic force of the elastic member, so that the workpiece can be conveniently taken and placed. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 is a structural schematic view of the first embodiment of the inner support positioning device of the utility model.

[0010] Fig. 2 is a top view of the first embodiment of the inner support positioning device of the utility model.

[0011] Fig. 3 is an A-A sectional view of Fig. 2.

[0012] Fig. 4 is an A-A sectional view of the installed workpiece.

[0013] Fig. 5 is a B-B sectional view of Fig. 2.

[0014] Fig. 6 is a structural schematic view of the second embodiment of the inner support positioning device of the utility model.

[0015] Fig. 7 is a top view of the second embodiment of the inner support positioning device of the utility model.

[0016] Fig. 8 is an A-A sectional view of Fig. 7. DETAILED DESCRIPTION

[0017] The utility model is further described below in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0018] As shown in Figures 1-5, the inner support positioning clamp of the embodiment comprises a plurality of sets of inner support positioning devices, the inner support positioning device is composed of a positioning seat 1, a top plate 2, an inner cylinder 3, a piston 4, a positioning claw 5 and a reset device 6, three evenly distributed sliding grooves are formed in the positioning seat 1, the positioning claw 5 is installed in the sliding groove, and the top surface of the positioning claw 5 is flush with the top surface of the positioning seat 1; the top plate 2 is fixed on the top of the positioning seat 1, so as to ensure that the positioning claw 5 moves in a straight line when it extends or retracts; the inner cylinder 3 is installed inside the positioning seat 1, a through hole is formed in the middle of the inner cylinder 3, and the inner cylinder 3 is fixedly connected with the bottom of the positioning seat 1 and forms a seal; the piston 4 is installed between the positioning seat 1 and the inner cylinder 3, the piston 4 is divided into a piston ring 41 and a piston rod 42, the piston ring 41 divides the cavity formed by the inner cylinder 3 and the positioning seat 1 into an upper cavity and a lower cavity, and a first sealing ring 7 is installed on the inner and outer sides of the piston ring 41; an air inlet channel 11 is formed in the positioning seat 1 and is communicated to the lower cavity; the outer side surface of the top of the piston rod 42 is a tapered surface, the inner side surface of the positioning claw 3 is in contact with the tapered surface of the piston rod 42; the reset device 6 is an elastic member, the positioning claw 5 and the positioning seat 1 are provided with an annular groove, and the elastic member is installed in the annular groove.

[0019] The elastic member of the reset device 6 is two annular springs 61, the positioning claw 5 and the positioning seat 1 are provided with two annular grooves, and the annular spring 61 is installed in the annular groove.

[0020] A second sealing ring 8 is installed on the cooperation surface of the positioning seat 1 and the piston rod 42, a second air inlet channel 12 is formed in the positioning seat 1 and is communicated to the upper cavity; the piston is retracted in a pneumatic mode, the piston is guaranteed to be returned to the position, and the spring force is insufficient to cause the positioning claw to be completely retracted.

[0021] An air blowing channel 13 is formed in the positioning seat 1, and the inner side opening of the air blowing channel 13 is on the surface of the top of the piston rod 42. In the machining process, the air inlet of the air blowing channel 13 makes the internal pressure of the inner support positioning device higher than the external pressure, so as to avoid that the cutting chips and cutting fluid in the cutting process enter the inside of the inner support positioning device.

[0022] An airtightness detection hole 21 is provided on the top plate 2. A detection air passage 14 is provided on the positioning seat 1 to connect to the airtightness detection hole 21. The detection air passage is connected to the air passage of the fixture plate and then to the airtightness detector, which can confirm that the workpiece is installed in place.

[0023] The positioning seat 1 has a flange mounting surface 15 on its outer side. The internal support positioning device is mounted onto the fixture plate via the flange mounting surface 15. The air inlet channel 11, the second air inlet channel 12, the blowing channel 13, and the detection air channel 14 are respectively connected to the flange mounting surface 15. O-ring grooves are formed on the flange mounting surface 15, and O-ring seals are installed, connecting to the corresponding air passages on the fixture plate. This internal gas passage connects the gas pipelines of multiple internal support positioning devices, resulting in higher gas pipeline reliability, a more compact structure, and easier installation and debugging.

[0024] This utility model's internal support positioning fixture has a hollow structure, allowing the cutting tool to extend into the hollow part to machine the bottom of the workpiece. It also allows for simultaneous machining of the external structure, ensuring the workpiece's positional accuracy and coaxiality. During use, once workpiece 0 is positioned, air intake channel 11 pushes piston 3 upward, causing three positioning claws 5 to extend radially simultaneously, achieving precise positioning of workpiece 0. After machining, air intake channel 11 becomes exhaust channel, piston rod retracts, and simultaneously, due to the rebound force of elastic element 6, the three positioning claws 5 retract, allowing for easy loading and unloading of workpiece 1. Furthermore, this utility model has a compact structure, allowing multiple internal support positioning devices to be installed on a single fixture plate, which improves the utilization rate of the machining center. Using this utility model's internal support positioning fixture can improve the machining accuracy and efficiency of similar bowl-shaped parts.

[0025] As shown in Figures 6-8, an internal support positioning fixture of this embodiment includes several sets of internal support positioning devices, which possess the features listed in the previous embodiment. The positioning seat 1 has three evenly distributed second sliding grooves 16, in which second positioning claws 9 are installed. The inner surface of the second positioning claws 9 contacts the piston rod. The top conical surface of the piston rod 42 has three evenly distributed lower grooves, which smoothly transition into the protruding conical surface. The top plate 2 has an annular groove 22, and a protruding conversion post 43 at the top of the piston rod 42 extends into the annular groove 22 of the top plate 2. The second positioning claw 9 is suitable for second workpieces of different specifications. When the product is switched to a different specification, it is only necessary to move the conversion column 43 on the piston rod 42 to rotate the piston, so that the ejector cone surface is aligned with the currently used positioning claw, and the conical groove part on the piston rod 42 is aligned with the currently unused positioning claw. The ring spring 61 causes the currently unused positioning claw to retract into the interior of the inner support positioning device, without affecting the positioning and installation of the current workpiece. In this way, two different specifications of products can be processed on one set of fixtures without changing the fixture, which helps to reduce product changeover time and improve the utilization rate of the machining center.

Claims

1. An internal bolster positioning fixture comprising a plurality of sets of internal bolster positioning devices, characterized in that: The inner support positioning device is composed of a positioning seat (1), a top plate (2), an inner cylinder (3), a piston (4), a positioning claw (5) and a reset device, three evenly distributed sliding grooves are formed in the positioning seat (1), the positioning claw (5) is installed in the sliding groove, the top plate (2) is fixed on the top of the positioning seat (1), the inner cylinder (3) is installed in the positioning seat (1), a through hole is formed in the middle of the inner cylinder (3), and the inner cylinder (3) is fixedly connected with the bottom of the positioning seat (1) and forms a seal; the piston is installed between the positioning seat (1) and the inner cylinder (3), the piston (4) is divided into a piston ring (41) and a piston rod (42), the piston ring (41) divides the cavity formed by the inner cylinder (3) and the positioning seat (1) into an upper cavity and a lower cavity, and a first sealing ring (7) is installed on the inner and outer sides of the piston ring (41); an air inlet channel (11) is formed in the positioning seat (1) and communicates with the lower cavity; the top outer side surface of the piston rod (42) is a conical surface, the inner side surface of the positioning claw (5) is in contact with the conical surface of the piston rod (42), and the reset device (6) is an elastic piece, and the positioning claw (5) and the positioning seat (1) are provided with an annular groove.

2. The internal bolster positioning fixture of claim 1, wherein: The elastic piece of the reset device (6) is two annular springs (61), the positioning claw (5) and the positioning seat (1) are provided with two annular grooves, and the annular spring (61) is installed in the annular groove.

3. The internal bolster positioning fixture of claim 2, wherein: A second sealing ring (8) is installed on the cooperation surface of the positioning seat (1) and the piston rod (42), and a second air inlet channel (12) is formed in the positioning seat (1) and communicates with the upper cavity.

4. The internal bolster positioning fixture of claim 3, wherein: A blowing channel (13) is formed in the positioning seat (1), and the inner side opening of the blowing channel is on the surface of the top of the piston rod (42).

5. The internal bolster positioning fixture of claim 4, wherein: An air tightness detection hole (21) is formed in the top plate (2), a detection air channel (14) is formed in the positioning seat (1) and communicates with the air tightness detection hole (21), and then communicates with an air tightness detector.

6. The internal bolster positioning fixture of claim 5, wherein: The positioning seat (1) has a flange mounting surface (15) on the outer side, the air inlet channel (11), the second air inlet channel (12), the blowing channel (13) and the detection air channel (14) respectively communicate with the mounting surface (15) and communicate with corresponding air path channels on the clamp plate.

7. The inside brace positioning fixture of claim 6, wherein: Three second sliding grooves (16) are formed in the positioning seat (1), a second positioning claw (9) is installed in the second sliding groove (16), the inner side surface of the second positioning claw (9) is in contact with the piston rod (42), and three evenly distributed grooves are formed in the top conical surface of the piston rod (42).

8. The internal bolster positioning fixture of claim 7, wherein: An annular groove (22) is formed in the top plate (2), and a protruding conversion column (43) is formed on the top of the piston rod (42) and extends into the annular groove (22) of the top plate (2).

Images