A long-stroke high-precision three-jaw fixture

Abstract

The present invention discloses a long-stroke high-precision three-jaw fixture, especially a fixture for grinding and removing the circumferential burrs of the hub holes on the hub. It includes a central positioning disk and three cylinder seats connected together by bolts, and the angle between the three cylinder seats is 120 degrees; two linear guides are fixed on each cylinder seat, and there is a linear guide slider on each linear guide, and the connecting plate is connected to the two linear guide sliders; the connecting plate, the guide bar, the clamping block, the cylinder block, and the upper fixing plate of the cylinder are respectively connected by bolts; the movement of the cylinder block drives the movement of the clamping block to realize the clamping and relaxation of the hub; the movement of the three synchronous toothed belt clamping blocks drives the movement of the synchronous toothed belt to ensure the synchronization of the cylinder block; the movement of the cylinder block drives the movement of the slide plate and the synchronous toothed belt clamping block; the movement of the slide plate discharges the aluminum chips generated during the grinding process along the holes on the cylinder seat; it has the advantages of low price, compact overall structure, large clamping force, and strong stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of hub processing, and in particular relates to a fixture for grinding and removing circumferential burrs on hub holes of a hub. Background Art

[0002] During the hub processing, it is often necessary to use a tool fixed on the sixth axis of a robot to deburr multiple hub holes on the periphery of the hub, which is an indispensable production process on an automatic production line. When the deburring tool works, its movement trajectory is designed for the hub holes. Before the deburring tool works, the hub needs to be fixed on a fixture, and the higher the accuracy of the fixture, the better the deburring effect.

[0003] At present, the unilateral stroke of the jaws of the long-stroke three-jaw fixture found on the market is only 65 mm, and the repeatability accuracy is ±0.1 mm. It is difficult to meet the usage requirements of the current aluminum alloy hub automatic deburring production line. At the same time, the synchronization of the current long-stroke fixture is not good, and the phenomenon of out-of-synchronization between the jaws often occurs. And when deburring, since aluminum chips will be generated, the splashing of the aluminum chips is likely to cause the fixture to get stuck. Summary of the Invention

[0004] The purpose of the present invention is to provide a three-jaw fixture that can improve the operation efficiency and positioning accuracy. Therefore, this three-jaw fixture is designed. The unilateral stroke of the jaws of the three-jaw fixture can reach 150 mm, and the repeatability accuracy is ±0.05 mm. It can meet the usage requirements for deburring 13-inch and 22-inch hubs.

[0005] The complete technical solution of the present invention is as follows:

[0006] A long-stroke high-precision three-jaw fixture, which is suitable for grinding and removing circumferential burrs on hub holes of a hub;

[0007] The long-stroke high-precision three-jaw fixture includes a central positioning disk, and the central positioning disk is provided with three groups of jaw mechanisms. The structures of each group of jaw mechanisms are the same and the included angles between them are all 120°;

[0008] The structure of each group of jaw mechanisms is as follows: including a linear guide rail, a cylinder, a guide bar, a clamping block, a cylinder seat, a cylinder block, a synchronous toothed belt wheel, a synchronous toothed belt clip block, a synchronous toothed belt, a belt pressing wheel assembly, a lower cylinder fixing plate, a slide plate, a power shaft, and a shield;

[0009] The cylinder seat is connected to the central positioning disk, and a cylinder is provided on the cylinder seat. The piston rod of the double-piston slide table cylinder is fixed and provided with an air inlet and an exhaust hole. The cylinder block of the cylinder can move left and right on the piston rod of the cylinder;

[0010] Two linear guides are fixed on the cylinder block. There is a linear guide slider on each linear guide, and the two linear guide sliders are connected to the front connecting plate.

[0011] The connecting plate, guide bar, clamping block, cylinder block, and upper fixing plate of the cylinder are connected by bolts respectively. The movement of the cylinder block drives the movement of the clamping block to realize the clamping and relaxation of the hub.

[0012] A pressure belt wheel assembly is provided on the center positioning disc. A synchronous toothed belt wheel shaft is fixed on each cylinder block. A synchronous toothed belt wheel is provided on the synchronous toothed belt wheel shaft, and the synchronous toothed belt wheel can rotate freely on the synchronous toothed belt wheel shaft. A synchronous toothed belt passes through the pressure belt wheel assembly and the synchronous toothed belt wheel at the same time.

[0013] A synchronous toothed belt clamp block and a synchronous toothed belt pressure plate are provided on the cylinder block at the same time. The synchronous toothed belt clamp block and the synchronous toothed belt pressure plate press the synchronous toothed belt with bolts respectively, forming a synchronous mechanism for the synchronous toothed belt.

[0014] It also includes a lower fixing plate of the cylinder, a sliding plate, and a power shaft connected to the cylinder block by bolts. The power shaft is connected to it through the central hole on the synchronous toothed belt clamp block, and the shield is fixed on the cylinder block. The movement of the cylinder block drives the movement of the sliding plate and the synchronous toothed belt clamp block. The movement of the sliding plate discharges the aluminum chips generated during the grinding process along the holes on the cylinder block.

[0015] The center positioning disc and three cylinder blocks with an included angle of 120° between each other form a basic frame structure.

[0016] The cylinder is a double piston slide cylinder.

[0017] The three air inlet joints of the three cylinders are connected by air pipes and converge into the first air pipe. The three exhaust joints of the three cylinders are connected by air pipes and converge into the second air pipe. The movement of the cylinder block is realized by the intake and exhaust of the two air pipes.

[0018] Three groups of jaw mechanisms share one synchronous toothed belt. One synchronous toothed belt, three synchronous toothed belt wheels, three pressure belt wheel assemblies, three power shafts, three synchronous toothed belt clamp blocks, and three synchronous toothed belt pressure plates form a three-jaw fixture synchronous mechanism.

[0019] The movement of the three synchronous toothed belt clamp blocks drives the movement of the synchronous toothed belt to ensure the synchronization of the cylinder block.

[0020] The opening and closing stroke of the long-stroke high-precision fixture is 150 mm.

[0021] The advantages of the present invention over the prior art are as follows: This long-stroke and high-precision three-jaw fixture is suitable for use on an automatic production line for automatically grinding and deburring aluminum alloy wheels driven by a six-axis robot. The three-jaw fixture disclosed in the present invention is reasonably designed, has high positioning accuracy, and the opening and closing stroke of the fixture can reach 150 mm. It can achieve the positioning and clamping of wheels from 13 inches to 22 inches without any adjustment. The clamping block fixed on the linear guide slider drives the synchronous toothed belt, and the synchronous movement of the three clamping blocks is realized through the meshing transmission of the synchronous toothed belt and the synchronous toothed belt pulley, ensuring the repeatability accuracy of the fixture. The central positioning disk, the cylinder seat, and the shield form a relatively enclosed space for the transmission of the synchronous toothed belt and the pulley, and the aluminum chips generated during deburring are discharged from the cylinder seat through the slide plate fixed on the cylinder block. This avoids the jamming phenomenon caused by aluminum chips during deburring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is the front view of the long-stroke and high-precision three-jaw fixture of the present invention.

[0023] Figure 2 is Figure 1 the A-A cross-sectional view in

[0024] Figure 3 FIG. is the rear view of the long-stroke and high-precision three-jaw fixture of the present invention with the shield removed.

[0025] Figure 4 FIG. is another front view of the long-stroke and high-precision three-jaw fixture of the present invention.

[0026] Figure 5 position Figure 4 the B-B cross-sectional view in

[0027] In the figures: 101 - central positioning disk, 102 - linear guide, 103 - linear guide slider, 104 - connecting plate, 105 - cylinder, 106 - guide bar, 107 - clamping block, 108 - cylinder seat, 109 - first pneumatic quick connector, 110 - second pneumatic quick connector, 111 - third pneumatic quick connector, 112 - fourth pneumatic quick connector, 113 - fifth pneumatic quick connector, 114 - sixth pneumatic quick connector, 115 - cylinder block, 116 - upper fixing plate of the cylinder, 117 - synchronous toothed belt pulley shaft, 118 - synchronous toothed belt pulley, 119 - synchronous toothed belt clamping block, 120 - synchronous toothed belt pressing plate, 121 - synchronous toothed belt, 122 - belt pressing wheel assembly, 123 - lower fixing plate of the cylinder, 124 - slide plate, 125 - power shaft, 126 - shield. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Figure 1This is the front view of the long-stroke high-precision three-jaw fixture of the present invention. Figure 2 It is Figure 1 the A-A cross-sectional view in Figure 1-2 as shown: The long-stroke high-precision three-jaw fixture of the present invention includes a central positioning disk, and three groups of jaw mechanisms are provided on the central positioning disk. The structures of each group of jaw mechanisms are the same and the included angles between them are all 120°. Therefore, it is only necessary to describe the structure of one group of jaw mechanisms, which does not prevent the understanding of the technical solution of the present invention.

[0030] The central positioning disk 101 is connected to the three cylinder seats 108 by bolts, and the included angle between the three cylinder seats 108 is 120 degrees, forming the basic framework of the three-jaw fixture. The cylinder 105 is a double-piston slide cylinder. The characteristic of this cylinder is that the piston rod is fixed and has an air inlet and an exhaust hole. The cylinder block 115 can move left and right on the piston rod of the cylinder 105. The first pneumatic quick-connect fitting 109, the second moving quick-connect fitting 110, the third pneumatic quick-connect fitting 111, the fourth pneumatic quick-connect fitting 112, the fifth pneumatic quick-connect fitting 113, and the sixth pneumatic quick-connect fitting 114 are respectively connected to the cylinder 105. The first pneumatic quick-connect fitting 109, the fourth pneumatic quick-connect fitting 112, and the sixth pneumatic quick-connect fitting 114 are connected by air pipes and converge into the first air pipe. The second moving quick-connect fitting 110, the third pneumatic quick-connect fitting 111, and the fifth pneumatic quick-connect fitting 113 are connected by air pipes and converge into the second air pipe. The movement of the cylinder block 115 is realized by the intake and exhaust of the first air pipe and the second air pipe. Two linear guide rails 102 are fixed on each cylinder seat 108, and there is a linear guide rail slider 103 on each linear guide rail 102. The connecting plate 104 is connected to the two linear guide rail sliders 103. The connecting plate 104, the guide bar 106, the clamping block 107, the cylinder block 115, and the upper fixing plate 116 of the cylinder are respectively connected by bolts. The movement of the cylinder block 115 drives the movement of the clamping block 107 to realize the clamping and relaxation of the hub.

[0031] Figure 3 This is the rear view of the long-stroke high-precision three-jaw fixture of the present invention without the protective cover. As Figure 3 shown: In the long-stroke high-precision three-jaw fixture of the present invention, the synchronous toothed belt pulley shaft 117 is fixed on the cylinder seat 108, and there is a synchronous toothed belt pulley 118 on the synchronous toothed belt pulley shaft 117. The synchronous toothed belt pulley 118 can rotate freely on the synchronous toothed belt pulley shaft 117. A synchronous toothed belt 121 passes through the belt pressing wheel assembly 122 and the synchronous toothed belt pulley 118 at the same time. There are three belt pressing wheel assemblies 122 in total, which are located on the central positioning disk and the included angles between them are all 120°. The included angle between the belt pressing wheel assembly and the adjacent jaw mechanism is 60°. The synchronous toothed belt clamping blocks 119 and the synchronous toothed belt pressing plates 120 at the three places respectively press the toothed belt 121 with bolts, forming the synchronous mechanism of the synchronous toothed belt of the three-jaw fixture.

[0032] Figure 4 This is the front view of the long-stroke and high-precision three-jaw fixture of the present invention. Figure 5 It is the sectional view taken along line B-B. As Figure 4-5 shown: In the long-stroke and high-precision three-jaw fixture of the present invention, the lower fixed plate 123 of the cylinder, the slide plate 124, the power shaft 125 and the cylinder block 115 are connected by bolts. The power shaft 125 is connected to it through the central hole on the synchronous toothed belt clamp block 119. The shield 126 is fixed on the cylinder seat 108. The central positioning disk 101, the cylinder seat 108 and the shield 126 form a relatively enclosed space for the transmission of the synchronous toothed belt 121 and the synchronous toothed belt pulley 118. The movement of the cylinder block 115 drives the movement of the slide plate 124 and the synchronous toothed belt clamp block 119. The movement of the slide plate 124 discharges the aluminum chips generated during the grinding process along the holes on the cylinder seat 108. The movement of the three synchronous toothed belt clamp blocks 119 drives the movement of the synchronous toothed belt 121 to ensure the synchronization of the cylinder block 115.

[0033] This three-jaw fixture has the advantages of low price, compact overall structure, large clamping force, strong stability, etc., and is an indispensable component in the automatic grinding and deburring production line of aluminum alloy wheels.

[0034] The above is only a preferred embodiment of the present invention, and does not impose any limitation on the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A long-stroke high-precision three-jaw fixture, characterized in that The fixture is applicable to grinding and removing the circumferential burrs on the hub holes of the hub; The long-stroke high-precision three-jaw fixture includes a central positioning disk, and the central positioning disk is provided with three groups of jaw mechanisms. The structures of each group of jaw mechanisms are the same and the included angle between them is 120°; The structure of each group of jaw mechanisms is: including a linear guide rail, a cylinder, a guide bar, a clamping block, a cylinder seat, a cylinder block, a synchronous toothed belt pulley, a synchronous toothed belt clip block, a synchronous toothed belt, a belt pressing wheel assembly, a lower fixing plate of the cylinder, a slide plate, a power shaft, and a shield; The cylinder seat is connected to the central positioning disk, and a cylinder is provided on the cylinder seat. The cylinder is a double-piston slide cylinder. The piston rod of the double-piston slide cylinder is fixed and has an air inlet and an exhaust hole. The cylinder block of the cylinder can move left and right on the piston rod of the cylinder; Two linear guide rails are fixed on the cylinder seat, and there is a linear guide rail slider on each linear guide rail. The two linear guide rail sliders are connected to the front connecting plate; The connecting plate, the guide bar, the clamping block, the cylinder block, and the upper fixing plate of the cylinder are respectively connected by bolts; the movement of the cylinder block drives the movement of the clamping block to realize the clamping and loosening of the hub; A belt pressing wheel assembly is provided on the central positioning disk. A synchronous toothed belt pulley shaft is fixed on each cylinder block. A synchronous toothed belt pulley is provided on the synchronous toothed belt pulley shaft. The synchronous toothed belt pulley can rotate freely on the synchronous toothed belt pulley shaft; a synchronous toothed belt passes through the belt pressing wheel assembly and the synchronous toothed belt pulley at the same time; The cylinder block is also provided with a synchronous toothed belt clip block and a synchronous toothed belt pressing plate. The synchronous toothed belt clip block and the synchronous toothed belt pressing plate respectively press the synchronous toothed belt with bolts; a synchronous mechanism of the synchronous toothed belt is formed; It also includes a lower fixing plate of the cylinder, a slide plate, and a power shaft connected to the cylinder block by bolts. The power shaft is connected to it through the central hole on the synchronous toothed belt clip block. The shield is fixed on the cylinder seat; the movement of the cylinder block drives the movement of the slide plate and the synchronous toothed belt clip block; the movement of the slide plate discharges the aluminum chips generated during the grinding process along the holes on the cylinder seat.

2. The long-stroke high-precision three-jaw fixture according to claim 1, characterized in that The central positioning disk and three cylinder seats with an included angle of 120° between each other form a basic frame structure.

3. The long-stroke high-precision three-jaw fixture according to claim 1, wherein, The three air inlet joints of the three cylinders are connected by air pipes and converge into the first air pipe. The three exhaust joints of the three cylinders are connected by air pipes and converge into the second air pipe. The movement of the cylinder block is realized by the intake and exhaust of the two air pipes.

4. A long-stroke high-precision three-jaw clamp according to claim 1, wherein The three groups of jaw mechanisms share one synchronous toothed belt. One synchronous toothed belt, three synchronous toothed belt pulleys, three belt pressing wheel assemblies, three power shafts, three synchronous toothed belt clip blocks, and three synchronous toothed belt pressing plates form a three-jaw fixture synchronous mechanism.

5. The long-stroke high-precision three-jaw fixture according to claim 4, characterized in that, The movement of the three synchronous toothed belt clip blocks drives the movement of the synchronous toothed belt to ensure the synchronization of the cylinder blocks.

6. The long-stroke high-precision three-jaw clamp according to claim 1, wherein The opening and closing stroke of the long-stroke high-precision fixture is 150 mm.

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