Clamp for grinding surface of engine crankshaft

Abstract

The utility model discloses a clamp for grinding the surface of an engine crankshaft, which relates to a tool clamp and comprises a connecting piece. A connecting piece is installed on the base, a workbench is rotatably installed on the connecting piece, an electromagnetic coil is installed in the workbench, a clamp body is fixedly installed on one side of the workbench, a clamping face is arranged in the clamp body, the axis of the electromagnetic coil and the axis of the clamping face are arranged in an eccentric mode, and a supporting piece with the position adjustable in the radial direction of the clamping face is installed on the clamp body. A positioning part for positioning and supporting one end of the crankshaft is arranged at one end, close to the axis of the clamping surface, of the supporting piece; a supporting structure used for supporting the other end of the crankshaft is arranged at the end, away from the workbench, of the connecting piece. The crankshaft clamping and positioning device is convenient to clamp and high in efficiency, can ensure that clamping force for clamping and positioning the crankshaft is consistent every time, and solves the problem of large difference of clamping every time in the prior art.

Description

Technical Field

[0001] The utility model relates to a fixture, in particular to a fixture used for grinding the surface of an engine crankshaft. Background Art

[0002] The engine crankshaft is one of the key components of the engine. The crankshaft converts the linear motion of the piston into rotational motion and outputs torque to drive other accessories on the engine. The crankshaft is subjected to the combined effects of the centrifugal force of the rotating mass, the periodically changing gas inertia force and the reciprocating inertia force, which makes the crankshaft subject to bending and torsional loads, and is prone to journal wear and fatigue fracture. Therefore, the crankshaft needs to have sufficient strength and rigidity, and the journal surface needs to be wear-resistant, work evenly and have good balance.

[0003] Surface strengthening grinding technology is a processing method used to improve the surface hardness, wear resistance and surface quality of metal materials. Its basic principle is to use a nozzle to spray the material onto the surface of the workpiece to form a composite layer with a shallow thickness but extremely high hardness, which can effectively improve the performance and surface accuracy of the crankshaft.

[0004] During the process of machining the crankshaft surface, a clamp is needed to fix the crankshaft. The existing machining technology requires manual disassembly of the crankshaft and multiple clamping. Moreover, the clamping conditions of each manual clamping vary greatly, which easily leads to unstable clamping and poor machining results. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a clamp for grinding the surface of an engine crankshaft in view of the deficiencies of the prior art, which can ensure that the clamping force for clamping and positioning the crankshaft is consistent each time, thus solving the problem of large differences in clamping each time in the prior art.

[0006] The utility model discloses a clamp for grinding the surface of an engine crankshaft, comprising a connecting piece; a workbench is rotatably mounted on the connecting piece, an electromagnetic coil is mounted in the workbench, a clamp body is fixedly mounted on one side of the workbench, a clamping surface is provided in the clamp body, the axis of the electromagnetic coil is eccentrically arranged with the axis of the clamping surface, a supporting piece adjustable along the radial position of the clamping surface is mounted on the clamp body, a positioning portion for positioning and supporting one end of the crankshaft is provided at one end of the supporting piece close to the axis of the clamping surface; a supporting structure for supporting the other end of the crankshaft is provided at one end of the connecting piece away from the workbench.

[0007] As a further improvement, the axis of the clamping surface is coaxially arranged with the axis of the workbench.

[0008] As a further improvement, two support members are provided, both of which are located on the eccentric side of the electromagnetic coil relative to the axis of the clamping surface, and the two support members are symmetrically arranged with the axis of the clamping surface as the symmetry center.

[0009] As a further improvement, a long through slot is provided in the support member, two bolts 1 are inserted in the through slot, and the two bolts 1 are both screwed on the clamp body.

[0010] As a further improvement, the supporting structure includes a supporting seat and a supporting rod, the connecting piece is provided with a dovetail groove, the supporting seat is slidably installed in the dovetail groove, one end of the supporting seat passes through the connecting piece, and the supporting seat passes through the end of the connecting piece and provides a slot, the supporting rod is movably inserted in the slot; two long strip-shaped sliding grooves are provided on the side wall of the supporting seat passing through one end of the connecting piece, two bolts 2 are screwed on the side wall of the supporting rod, the two bolts 2 are correspondingly inserted in the two sliding grooves, and the support rod is provided with a supporting positioning groove at the end away from the supporting seat.

[0011] Furthermore, two pulleys are rotatably mounted on the top of the support rod, and a gap with a width smaller than the diameter of the round rod at the end of the crankshaft is provided between the two pulleys, and the gap and the two pulleys constitute a support positioning groove.

[0012] Beneficial Effects

[0013] The advantages of the utility model are: through the mutual clamping of the electromagnetic coil and the support member, the clamping force of the clamping and positioning of the crankshaft can be ensured to be consistent each time, which solves the problem of large differences in each clamping in the prior art. Compared with the prior art, each clamping and disassembly is more convenient and more efficient. In addition, the end of the crankshaft is also supported by the support structure, so that the support of the crankshaft by the clamp is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the clamp of the utility model;

[0015] Figure 2 It is a schematic diagram of the position layout structure of the electromagnetic coil, the support and the crankshaft of the utility model;

[0016] Figure 3 This is a schematic diagram of the support structure layout of the utility model;

[0017] Figure 4 This is a schematic diagram of the pulley installation structure of the utility model.

[0018] Among them: 1-connecting part, 2-working table, 3-clamping body, 4-clamping surface, 5-electromagnetic coil, 6-supporting part, 7-bolt one, 8-through groove, 9-dovetail groove, 10-supporting seat, 11-bolt two, 12-slide groove, 13-supporting rod, 14-nozzle, 15-crankshaft, 16-supporting positioning groove, 17-pulley. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the embodiments, but does not constitute any limitation to the utility model. Any limited modifications made by anyone within the scope of the claims of the utility model are still within the scope of the claims of the utility model.

[0020] See also Figure 1-Figure 4 The utility model discloses a fixture for grinding the surface of an engine crankshaft, comprising a connecting member 1 in an L-shaped structure. A workbench 2 is rotatably mounted on the connecting member 1, an electromagnetic coil 5 is mounted in the workbench 2, a clamping body 3 is fixedly mounted on one side of the workbench 2, a clamping surface 4 is provided in the clamping body 3, and the crankshaft 15 is placed thereon, and the crankshaft 15 is fixed thereon by the adsorption of the electromagnetic coil 5. The axis of the electromagnetic coil 5 is eccentrically arranged with the axis of the clamping surface 4, that is, there is an eccentricity between the crankshaft 15 and the electromagnetic coil 5 after installation. The axis of the clamping surface 4 is coaxially arranged with the axis of the workbench 2. A support member 6 whose radial position can be adjusted along the clamping surface 4 is mounted on the clamping body 3, and a positioning portion for positioning and supporting one end of the crankshaft 15 is provided at one end of the support member 6 close to the axis of the clamping surface 4, and the positioning portion is an arc-shaped structure. Specifically, two support members 6 are provided, and both support members 6 are located on the eccentric side of the electromagnetic coil 5 relative to the axis of the clamping surface 4 , and the two support members 6 are symmetrically arranged with the axis of the clamping surface 4 as the symmetry center.

[0021] With such an arrangement, when the workbench 2 rotates, due to the eccentricity between the crankshaft 15 and the electromagnetic coil 5, a torque and a friction force directed toward the axis of the clamp body 3 will be generated between the two. This torque will drive the crankshaft 15 to rotate with the clamp body 3 without the clamp body 3 and the crankshaft 15 rotating relative to each other, and the friction force will force the crankshaft 15 to advance toward the axis of the clamp body 3, and form a stable clamping and positioning for the crankshaft 15 with the two support members 6, achieving a better clamping and positioning effect. Moreover, by means of the electromagnetic coil 5 and the support members cooperating with each other to clamp, it can be ensured that the clamping force for clamping and positioning the crankshaft 15 is consistent each time, solving the problem of large differences in clamping each time in the prior art. Compared with the prior art, each clamping and disassembly is more convenient and more efficient.

[0022] In addition, a long through slot 8 is provided in the support member 6, and two bolts 7 are inserted in the through slot 8, and the two bolts 7 are both screwed on the clamp body 3. That is, by rotating the two bolts 7, the radial position of the support member 6 along the clamping surface 4 can be adjusted. When the position of the support member 6 needs to be adjusted, it is only necessary to loosen the bolts 7, adjust the position of the support member 6, and then tighten the bolts 7.

[0023] The end of the connecting member 1 away from the workbench 2 is provided with a supporting structure for supporting the other end of the crankshaft 15. Specifically, the supporting structure includes a supporting seat 10 and a supporting rod 13. A dovetail groove 9 is provided on the connecting member 1, and the supporting seat 10 is slidably installed in the dovetail groove 9. In this way, the supporting structure can slide along the axial direction of the crankshaft 15 to adjust the supporting position of the end of the crankshaft 15. One end of the supporting seat 10 passes through the connecting member 1, and a slot is provided at the end of the supporting seat 10 passing through the connecting member 1, and the supporting rod 13 is movably inserted in the slot. Two long strip-shaped slide grooves 12 are provided on the side wall of the supporting seat 10 passing through one end of the connecting member 1, and two bolts 11 are screwed on the side wall of the supporting rod 13. The two bolts 11 are inserted into the two slide grooves 12 one by one, and a supporting positioning groove 16 is provided at the end of the supporting rod 13 away from the supporting seat 10. The height position of the supporting rod 13 is adjusted, which greatly improves the flexibility of the clamp.

[0024] Preferably, two pulleys 17 are rotatably mounted on the top of the support rod 13, and a gap with a width smaller than the diameter of the round rod at the end of the crankshaft 15 is provided between the two pulleys 17, and the gap and the two pulleys 17 constitute a support positioning groove 16. Two pulleys 17 are provided on the top of the support rod 13 to support the end of the crankshaft 15, in order to convert the friction between the supporting surface of the support rod 13 and the crankshaft 15 into rolling friction, thereby solving the problem that the crankshaft is too heavy, the friction torque at the end is large and it is not easy to rotate, resulting in the difficulty in covering the processing surface.

[0025] The working principle of the utility model is: fix the connecting member 1 on the machine tool, and connect the workbench 2 with the rotating shaft of the machine tool. After the installation is completed, the crankshaft 15 to be processed is placed at the center of the clamping surface 4, and then the electromagnetic coil 5 is powered on to adsorb the crankshaft 15. Among them, the electromagnetic coil 5 can be connected to the external power supply through an electric slip ring to realize that it is powered during the rotation process. Then adjust the support member 6 so that the support member 6 contacts the edge of the crankshaft 15, and lock the support member 6; adjust the position of the support seat 10 and the support rod 13 so that the positioning part is located below the crankshaft 15 and forms an effective support for the end of the crankshaft, thereby completing the installation of the fixture and the clamping of the crankshaft 15 to be processed. Finally, install the nozzle 14 on the connecting member 1 and make it located above the crankshaft 15. After starting the machine tool, its rotating shaft will drive the crankshaft 15 to rotate, and the pellets, grinding powder, grinding liquid and compressed gas used for processing are mixed and sprayed onto the crankshaft 15 to be processed through the nozzle 14, thereby processing the surface of the crankshaft 15.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A fixture for grinding the surface of an engine crankshaft, characterized in that: The invention comprises a connecting member (1); a workbench (2) is rotatably mounted on the connecting member (1); an electromagnetic coil (5) is mounted in the workbench (2); a clamping body (3) is fixedly mounted on one side of the workbench (2); a clamping surface (4) is provided in the clamping body (3); the axis of the electromagnetic coil (5) is eccentrically arranged with the axis of the clamping surface (4); a supporting member (6) whose radial position is adjustable along the clamping surface (4) is mounted on the clamping body (3); a positioning portion for positioning one end of a crankshaft (15) is provided at one end of the supporting member (6) close to the axis of the clamping surface (4); and a supporting structure for supporting the other end of the crankshaft (15) is provided at one end of the connecting member (1) away from the workbench (2).

2. A fixture for grinding the surface of an engine crankshaft according to claim 1, characterized in that: The axis center of the clamping surface (4) is coaxially arranged with the axis center of the workbench (2).

3. The fixture for grinding the surface of an engine crankshaft according to claim 1, characterized in that: Two support members (6) are provided, and both support members (6) are located on the eccentric side of the electromagnetic coil (5) relative to the axis of the clamping surface (4), and the two support members (6) are symmetrically arranged with the axis of the clamping surface (4) as the symmetry center.

4. A fixture for grinding the surface of an engine crankshaft according to claim 1 or 3, characterized in that: The support member (6) is provided with a long through slot (8), and two bolts (7) are inserted into the through slot (8). The two bolts (7) are both screwed onto the clamp body (3).

5. The fixture for grinding the surface of an engine crankshaft according to claim 1, characterized in that: The supporting structure comprises a supporting seat (10) and a supporting rod (13); a dovetail groove (9) is provided on the connecting member (1); the supporting seat (10) is slidably installed in the dovetail groove (9); one end of the supporting seat (10) passes through the connecting member (1); and a slot is provided at one end of the supporting seat (10) passing through the connecting member (1); the supporting rod (13) is movably inserted in the slot; two long strip-shaped sliding grooves (12) are provided on the side wall of one end of the supporting seat (10) passing through the connecting member (1); two bolts (11) are screwed on the side wall of the supporting rod (13); the two bolts (11) are inserted into the two sliding grooves (12) in a one-to-one manner; and a supporting positioning groove (16) is provided at one end of the supporting rod (13) away from the supporting seat (10).

6. A fixture for grinding the surface of an engine crankshaft according to claim 5, characterized in that: Two pulleys (17) are rotatably mounted on the top of the support rod (13), and a gap with a width smaller than the diameter of the round rod at the end of the crankshaft (15) is provided between the two pulleys (17), and the gap and the two pulleys (17) form a support positioning groove (16).

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