Clamp and crankshaft grinding machine

Abstract

The utility model discloses a clamp and a crankshaft grinding machine, the clamp comprises a rotating seat, a supporting seat, a positioning assembly and two mounting seats, and the two mounting seats are respectively arranged on a main shaft of the crankshaft grinding machine; the rotating seat is arranged on one of the mounting seats through a positioning rotating shaft and is used for being fixedly connected with the flywheel end of the crankshaft; the positioning assembly is arranged on the mounting base where the rotating base is located, and the positioning assembly is clamped to the rotating base and positions the position of the rotating base after rotation; the supporting base is arranged on the other mounting base and used for being fixedly connected with the free end of the crankshaft. A user fixes the position of the rotating seat in advance according to the position of the bent neck of the crankshaft to be machined, and then it is guaranteed that the bent neck to be machined and the main shaft share the same central axis. The method can be widely applied to the technical field of crankshaft machining.

Description

Technical Field

[0001] This application relates to the technical field of crankshaft processing, and particularly relates to a fixture and a crankshaft grinding machine. Background Art

[0002] Generally, a crankshaft is processed by a crankshaft grinding machine. The crankshaft grinding machine uses a grinding wheel to process the outer circles of the main journal and the connecting rod journal of the crankshaft. The two ends of the crankshaft are respectively clamped on the headstock and the tailstock of the crankshaft grinding machine, and then the main shaft of the crankshaft grinding machine drives the crankshaft to rotate around the central axis. The crankshaft has crank necks corresponding to different cylinders. If the crank neck to be processed is placed on an ordinary steady rest, other crank necks cannot be processed. Some crankshaft grinding machines achieve lifting in a numerical control manner, so that different crank necks can be coaxial with the main shaft, but this method results in a high manufacturing cost of the machine tool. Summary of the Utility Model

[0003] To solve at least one of the above technical problems, this application provides a fixture and a crankshaft grinding machine, and the technical solutions adopted are as follows.

[0004] The crankshaft grinding machine provided by this application includes a fixture.

[0005] The fixture provided by this application includes a rotating seat, a supporting seat, a positioning component, and two mounting seats. The two mounting seats are respectively arranged on the main shaft of the crankshaft grinding machine; the rotating seat is arranged on one of the mounting seats through a positioning rotating shaft, and the rotating seat is used for fixedly connecting the flywheel end of the crankshaft; the positioning component is arranged on the mounting seat where the rotating seat is located, and the positioning component clamps the rotating seat and positions the position of the rotating seat after rotation; the supporting seat is arranged on the other mounting seat, and the supporting seat is used for fixedly connecting the free end of the crankshaft.

[0006] In some embodiments of this application, the fixture includes a locking member, and after the rotating seat rotates, it is fixed to the mounting seat where it is located through the locking member.

[0007] In some embodiments of this application, at least two first through holes for installing the locking member are arranged on the rotating seat, the first through holes are circumferentially spaced around the rotation center of the rotating seat, and the locking member penetrates through the first through holes to fixedly connect the rotating seat and the mounting seat.

[0008] In some embodiments of this application, at least two positioning grooves are arranged on the edge of the rotating seat, the positioning grooves are spaced around the rotation center of the rotating seat, and the positioning component clamps the side wall of the positioning groove to position the rotating seat.

[0009] In certain embodiments of the present application, the positioning component includes a positioning seat and a positioning adjustment member. The positioning seat is disposed on the mounting seat where the rotating seat is located. The positioning adjustment member is disposed on the positioning seat in a threaded connection manner, and the positioning adjustment member can move and engage with the rotating seat.

[0010] In certain embodiments of the present application, the positioning adjustment member includes a positioning threaded member and a positioning pin. The positioning threaded member is movably connected to the positioning pin. The positioning threaded member drives the positioning pin to reciprocate, and the positioning pin can engage with the positioning groove or the positioning pin can withdraw from the positioning groove.

[0011] In certain embodiments of the present application, the fixture includes a first gear and a second gear. The first gear is disposed on the mounting seat where the rotating seat is located. The second gear is fixedly disposed on the rotating seat and the second gear is arranged concentrically with the rotating seat. The first gear and the second gear are in meshing transmission, and the second gear can drive the rotating seat to rotate and adjust its position.

[0012] In certain embodiments of the present application, the support seat includes a base and a top cover. The free end of the crankshaft is disposed on the base. The top cover and the base embrace the free end of the crankshaft and the top cover is fixedly connected to the base.

[0013] In certain embodiments of the present application, the fixture includes a positioning member. The positioning member is fixedly disposed on both mounting seats. The positioning member is connected to a set position of the crankshaft grinding machine to position the mounting seats at the position of the crankshaft grinding machine.

[0014] The embodiments of the present application at least have the following beneficial effects: The two mounting seats in the fixture are respectively disposed on the main shafts at the headstock and the tailstock of the crankshaft grinding machine. The user pre-rotates the rotating seat and uses the positioning component to position the rotating seat. The flywheel end of the crankshaft is fixedly disposed on the rotating seat of one of the mounting seats, and the free end of the crankshaft is fixedly disposed on the support seat of the other mounting seat. The user has fixed the position of the rotating seat in advance according to the position of the crank journal of the crankshaft to be processed, thereby ensuring that the crank journal to be processed is concentric with the main shaft. The present application can be widely applied to the technical field of crankshaft processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The aspects and advantages described and / or appended in the embodiments of the present application will become apparent and be easily understood in conjunction with the following drawings. It should be noted that the embodiments shown in the following drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0016] Figure 1 It is a structural diagram of the fixture connecting the main shaft of the crankshaft grinding machine and clamping the crankshaft.

[0017] Figure 2 is Figure 1 the front view in the A direction.

[0018] Figure 3 is the structural diagram of the rotating base and the B-B cross-sectional view.

[0019] Figure 4 is the structural diagram of the positioning and adjusting part.

[0020] Figure 5 is the structural diagram of the positioning rotating shaft.

[0021] Figure 6 is the structural diagram of the base and the C-C cross-sectional view.

[0022] Figure 7 is the structural diagram of the top cover.

[0023] Reference numerals: 1000, main shaft; 2100, mounting seat; 2200, rotating base; 2201, positioning groove; 2202, opening seat; 2203, first through hole; 2204, positioning rotating shaft; 2300, support seat; 2301, positioning structure; 2302, base; 2303, top cover; 2304, second through hole; 2401, positioning seat; 2402, positioning threaded part; 2403, positioning pin; 2501, first gear; 2502, second gear; 2600, locking part; 2700, positioning part. Detailed implementation manners

[0024] The following will combine the attached Figure 1 to the attached Figure 7 to describe the embodiments of the present application in detail, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the attached drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0025] In the description of the present application, it should be understood that if terms such as "center", "middle part", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0026] In the description of the present application, the meaning of "several" is more than one, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, and understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0027] In the description of the present application, unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", and "coupled" shall be understood in a broad sense. For example: it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] In the description of the present application, if there are descriptions of reference terms such as "as an embodiment", "an embodiment", "some examples", "some embodiments", "schematic embodiments", "examples", "specific examples", "some examples", etc., it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0029] The present application relates to a crankshaft grinding machine. The crankshaft grinding machine includes a fixture, and the fixture is fixedly arranged on the main shaft 1000 of the crankshaft grinding machine. The two ends of the crankshaft are fixed on the fixture. Driven by the main shaft 1000 of the crankshaft grinding machine, the crankshaft rotates so that the crankshaft grinding machine can process the crankshaft.

[0030] The other components and operations of the crankshaft grinding machine are already recorded in the relevant art for those of ordinary skill in the art and will not be described in detail here. The structure of the fixture will be introduced below.

[0031] This application relates to a fixture that clamps and fixes both ends of a crankshaft. The fixture includes mounting seats 2100, and there are two mounting seats 2100, which serve as the left base 2302 and the right base 2302 of the fixture. The two mounting seats 2100 are respectively arranged at the headstock and the tailstock of the crankshaft grinding machine, and are respectively arranged on the main shaft 1000 of the crankshaft grinding machine. The mounting seat 2100 is fixedly connected to the main shaft 1000 through a flange and bolts or screws. Further, the fixture includes a rotating seat 2200 and a supporting seat 2300. The rotating seat 2200 is arranged on one of the mounting seats 2100, and the supporting seat 2300 is arranged on the other mounting seat 2100.

[0032] The crankshaft is clamped and fixed between the rotating seat 2200 and the supporting seat 2300. Specifically, the rotating seat 2200 is used for fixedly connecting the flywheel end of the crankshaft, and the supporting seat 2300 is used for fixedly connecting the free end of the crankshaft, thereby realizing the clamping of both ends of the crankshaft by the fixture.

[0033] The fixture is set as an eccentric fixture. The rotating seat 2200 and the supporting seat are both in an eccentric position with respect to the main shaft 1000 of the crankshaft grinding machine. And after the fixture clamps the crankshaft, the crank neck to be machined is adjusted to a position concentric with the main shaft 1000 for machining the crank neck.

[0034] The rotating seat 2200 is arranged on the corresponding mounting seat 2100 through a positioning rotating shaft 2204. The rotating seat 2200 can rotate on the mounting seat 2100 to adjust the position of the rotating seat 2200 on the mounting seat 2100, and further adjust the crank neck to be machined to a position concentric with the main shaft 1000. It can be understood that if the crankshaft has multiple cylinders, it is difficult to machine the crank necks. After the crankshaft grinding machine machines the crank necks, the user rotates the rotating seat 2200 by a set angle to switch the next crank neck to be machined to a position concentric with the main shaft 1000.

[0035] Further, the fixture includes a positioning component, which is arranged on the mounting seat 2100 where the rotating seat 2200 is located. The positioning component clamps the rotating seat 2200 and positions the position of the rotating seat 2200 after rotation, and the positioning component clamping the rotating seat 2200 can fix the rotating seat 2200 to the mounting seat 2100.

[0036] It should be noted that after the mounting seat 2100 equipped with the rotating seat 2200 is fixedly connected to the main shaft 1000 of the crankshaft grinding machine, the user rotates and adjusts and fixes the position of the rotating seat 2200 so that the crank neck to be machined on the crankshaft is in a position concentric with the main shaft 1000, and uses the positioning component to clamp the rotating seat.

[0037] As an implementation manner, the rotating base 2200 is arranged in a disc shape. Further, along the circumferential contour of the rotating base 2200, at least two positioning grooves 2201 are arranged on the edge of the rotating base 2200. The positioning grooves 2201 are formed by extending along the thickness direction of the rotating base 2200. The positioning grooves 2201 are distributed at intervals around the rotation center of the rotating base 2200. The positioning assembly is clamped to the side wall of the positioning groove 2201 to position the rotating base 2200. It can be understood that the user rotates the rotating base 2200 by a set angle and clamps one of the positioning grooves 2201 with the positioning assembly, then the rotating base 2200 can be positioned.

[0038] Further, the positioning grooves 2201 are distributed at intervals of 90° around the rotation center of the rotating base 2200. Alternatively, at least it can also be designed as an alternative: the positioning grooves 2201 are distributed at intervals of 120° around the rotation center of the rotating base 2200.

[0039] In some examples, the positioning grooves 2201 are divided into at least two groups. The positioning grooves 2201 in each group are distributed at intervals around the rotation center of the rotating base 2200, and the intervals of different groups are different, so that the rotating base 2200 can be adapted to crankshafts with different numbers of cylinders. For example: some of the positioning grooves 2201 are distributed at intervals of 90° around the rotation center of the rotating base 2200, and some of the positioning grooves 2201 are distributed at intervals of 120° around the rotation center of the rotating base 2200.

[0040] In some examples, the fixture includes an opening seat 2202. The opening seat 2202 is fixedly arranged in the positioning groove 2201. The opening seat 2202 has an opening facing outward in the radial direction of the rotating base 2200. The positioning assembly is clamped to the opening seat 2202 to achieve clamping of the rotating base 2200.

[0041] As an implementation manner, the positioning assembly includes a positioning adjusting member. The positioning adjusting member can move and clamp the rotating base 2200 to position the position of the rotating base 2200 after rotation. The positioning adjusting member is arranged in a long rod shape. The positioning adjusting member can reciprocate along its own length direction, and the positioning adjusting member can be inserted into the positioning groove 2201 or the positioning adjusting member can withdraw from the positioning groove 2201. Specifically, the front end of the positioning adjusting member can be inserted into the positioning groove 2201 or the front end of the positioning adjusting member can withdraw from the positioning groove 2201.

[0042] Further, the positioning assembly includes a positioning seat 2401. The positioning seat 2401 is arranged on the mounting seat 2100 where the rotating base 2200 is located. The positioning adjusting member is arranged on the positioning seat 2401. Specifically, the positioning adjusting member is arranged on the positioning seat 2401 in a threaded connection manner. The movement of the positioning adjusting member is realized through screw drive between the positioning adjusting member and the positioning seat 2401, and then the positioning adjusting member is inserted into the positioning groove 2201 or withdraws from the positioning groove 2201.

[0043] In some examples, the positioning adjustment member includes a positioning threaded member 2402. The positioning seat 2401 is provided with a threaded hole, and the positioning threaded member 2402 passes through the threaded hole. When the user rotates the positioning threaded member 2402, the movement of the positioning adjustment member can be realized. Specifically, an adjustment seat is provided on the positioning seat 2401, and the threaded hole is arranged on the adjustment seat. Further, the positioning adjustment member includes a positioning pin 2403. The positioning threaded member 2402 is connected to the positioning pin 2403, and the positioning threaded member 2402 and the positioning pin 2403 are arranged coaxially. The positioning threaded member 2402 drives the positioning pin 2403 to move back and forth, so that the positioning pin 2403 is engaged with or withdrawn from the positioning groove 2201.

[0044] It should be noted that the positioning threaded member 2402 is movably connected to the positioning pin 2403, so that the positioning threaded member 2402 can drive the positioning pin 2403 to move and avoid driving the positioning pin 2403 to rotate. Specifically, a ball head is provided at the front end of the positioning threaded member 2402, and a groove body is provided at the rear end of the positioning pin 2403. The groove body extends perpendicular to the axis of the positioning pin 2403 to the side wall port of the positioning pin 2403. The ball head at the front end of the positioning threaded member 2402 is inserted into the groove body from the port of the groove body, thereby realizing the assembly of the positioning threaded member 2402 and the positioning pin 2403, and the positioning threaded member 2402 and the positioning pin 2403 remain coaxially.

[0045] In some examples, the positioning seat 2401 is provided with a moving groove. The mounting seat 2100 is located at one end of the positioning seat 2401 close to the rotating seat 2200. The positioning pin 2403 is arranged in the moving groove, and driven by the positioning threaded member 2402, the positioning pin 2403 is movable in the moving groove. Further, the positioning seat 2401 is provided with a pressing plate, and the pressing plate is fixed on the surface of the positioning seat 2401 and covers the moving groove, so that the positioning pin 2403 is arranged in the moving groove.

[0046] Regarding the positioning adjustment member, in some examples, at least it can also be alternatively designed as: the positioning adjustment member elastically protrudes on the positioning seat 2401 and engages with the rotating disk. Specifically, a spring is sleeved on the outer side wall of the positioning adjustment member. Under the action of the spring, the front end of the positioning adjustment member is inserted into the positioning groove 2201. If the positioning adjustment member withdraws from the positioning groove 2201, the spring is in a compressed state.

[0047] As an implementation, the fixture includes a first gear 2501 and a second gear 2502. The first gear 2501 is arranged on the mounting base 2100 where the rotating base 2200 is located. The second gear 2502 is fixedly arranged on the rotating base 2200, and the second gear 2502 is fixedly connected to the rotating base 2200 through a plurality of bolts or screws. Further, the second gear 2502 and the rotating base 2200 are arranged concentrically on the same central axis. The first gear 2501 and the second gear 2502 are in meshing transmission, and the second gear 2502 can drive the rotating base 2200 to rotate and adjust its position.

[0048] It can be understood that under the operation of the user, the first gear 2501 rotates, the first gear 2501 drives the second gear 2502 to rotate, and the rotating base 2200 rotates synchronously with the second gear 2502, so as to realize the rotation and position adjustment of the rotating base 2200.

[0049] The first gear 2501 is set as a small gear, the second gear 2502 is set as a large gear, and the radius of the second gear 2502 is greater than that of the first gear 2501.

[0050] Further, the first gear 2501 is arranged on the mounting base 2100 where the rotating base 2200 is located through a gear shaft. One end of the gear shaft is rotatably connected to the mounting base 2100, and the other end of the gear shaft is provided with a structure that can be operated and rotated by the user using a tool. The user applies torque to the gear shaft of the toolbox to rotate the first gear 2501.

[0051] In some examples, one end of the gear shaft is connected to the mounting base 2100 through a bearing or a bushing.

[0052] As an implementation, the fixture includes a locking member 2600. The locking member 2600 is set to be at least one. After the rotating base 2200 rotates, it is fixed to the mounting base 2100 where it is located through the locking member 2600. Specifically, one end of the locking member 2600 is fixedly connected to the rotating base 2200, and the other end of the locking member 2600 is fixedly connected to the mounting base 2100 where the rotating base 2200 is located.

[0053] It should be noted that after the user rotates and adjusts the position of the rotating base 2200, the rotating base 2200 and the mounting base 2100 are fixed by the locking member 2600, so that the main shaft 1000 of the crankshaft grinding machine can drive the mounting base 2100 and the rotating base 2200 to rotate.

[0054] Further, at least two first through holes 2203 for installing the locking member 2600 are provided on the rotating base 2200. The first through holes 2203 penetrate the rotating base 2200 along the thickness direction of the rotating base 2200, and the first through holes 2203 are circumferentially spaced around the rotation center of the rotating base 2200. A second through hole 2304 is provided on the mounting base 2100 where the rotating base 2200 is located. The second through hole 2304 penetrates the mounting base 2100 along the thickness direction of the mounting base 2100. The locking member 2600 is disposed in the second through hole 2304, and the locking member 2600 penetrates the first through hole 2203 to fixedly connect the rotating base 2200 and the mounting base 2100.

[0055] In some examples, the locking member 2600 is set as a bolt. The locking member 2600 penetrates the first through hole 2203 and the second through hole 2304, and a nut presses the rotating base 2200 on the locking member 2600, thereby fixing the rotating base 2200 and the mounting base 2100.

[0056] As an implementation manner, one end of the positioning rotating shaft 2204 is fixedly connected to the rotating base 2200, and the other end of the positioning rotating shaft 2204 is connected to the mounting base 2100 through a rolling bearing.

[0057] Specifically, the positioning rotating shaft 2204 and the rotating base 2200 are fixedly connected by a flange and bolts or screws. The positioning rotating shaft 2204 and the mounting base 2100 are connected by a single-row radial ball bearing. The single-row radial ball bearing is sleeved on the outer side wall of the positioning rotating shaft 2204, and a spacer sleeve is sleeved on the outer side wall of the positioning rotating shaft 2204.

[0058] Regarding the positioning rotating shaft 2204, at least it can also be alternatively designed as: one end of the positioning rotating shaft 2204 is connected to the rotating base 2200 through a rolling bearing, and the other end of the positioning rotating shaft 2204 is fixedly connected to the mounting base 2100.

[0059] As an implementation manner, the support base 2300 and the mounting base 2100 where it is located are positioned and installed through a positioning structure 2301. Both ends of the positioning structure 2301 are respectively connected to the support base 2300 and the mounting base 2100. The positioning structure 2301 is set as a positioning pin, and the support base 2300 and the mounting base 2100 are respectively provided with positioning holes.

[0060] As an implementation manner, the support base 2300 includes a base 2302, and the free end of the crankshaft is disposed on the base 2302. Further, the free end of the crankshaft is fixed to the base 2302. The base 2302 is fixedly connected to the mounting base 2100 where the support base 2300 is located. The positioning structure 2301 is respectively connected to the base 2302 and the mounting base 2100. The base 2302 and the mounting base 2100 are fixedly connected by a flange and bolts or screws.

[0061] Further, the support base 2300 includes a top cover 2303. The top cover 2303 and the base 2302 embrace the free end of the crankshaft, and the top cover 2303 is fixedly connected to the base 2302, thereby fixing the free end of the crankshaft. Specifically, both the top cover 2303 and the base 2302 are provided with arc-shaped grooves. The top cover 2303 and the base 2302 embrace to form a hoop structure for clamping the free end of the crankshaft. The two ends of the top cover 2303 are respectively fixedly connected to the two ends of the base 2302, so that the top cover 2303 and the base 2302 clamp the free end of the crankshaft.

[0062] In some examples, the base 2302 is provided as a bearing block, and the top cover 2303 is provided as a bearing cover. The top cover 2303 and the base 2302 embrace to form a round hole for clamping the free end of the crankshaft.

[0063] In some examples, the two ends of the top cover 2303 and the base 2302 are respectively locked by bolts.

[0064] In some examples, the top cover 2303 is provided with a second through hole 2304 in the radial direction. A top support member is provided in the second through hole 2304, and the top support member is threadedly connected to the inner side wall of the second through hole 2304. The top support member is provided as a screw. The user rotates the top support member so that the front end of the top support member presses against the side wall of the crankshaft, and further separates the top cover 2303 from the crankshaft. Further, the second through holes 2304 are symmetrically arranged near the two ends on the top cover 2303, so that the top cover 2303 can be evenly stressed.

[0065] As an implementation manner, the fixture includes a positioning member 2700. Positioning members 2700 are fixedly provided on both mounting seats 2100. The positioning member 2700 is connected to a set position of the crankshaft grinder to position the mounting seat 2100 on the crankshaft grinder. It can be understood that the positions of the two mounting seats 2100 on the crankshaft grinder correspond to each other, so that both ends of the crankshaft can be clamped in the fixture.

[0066] Specifically, the positioning member 2700 is provided as a positioning plate or a positioning block. One end of the positioning member 2700 is fixedly connected to the surface of the mounting seat 2100 facing the main shaft 1000. The base 2302 with a positioning hole is provided on the crankshaft grinder. The other end of the positioning plate has a corresponding positioning hole. The user aligns the positioning holes of the positioning plate and the base 2302 with a positioning pin, thereby realizing the positioning of the mounting seat 2100 on the crankshaft grinder.

[0067] It should be noted that after the fixture and the crankshaft grinder are assembled, the user removes the positioning pin on the positioning member 2700.

[0068] The above has described the embodiments of the present application in detail with reference to the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the gist of the present application within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A clamp, characterized in that: include Two mounting seats, the two mounting seats are respectively arranged on the main shaft of the crankshaft grinder; A rotating seat, the rotating seat is arranged on one of the mounting seats through a positioning shaft, and the rotating seat is used to fix the flywheel end connected to the crankshaft; A positioning assembly, the positioning assembly is arranged on the mounting seat where the rotating seat is located, the positioning assembly is clamped with the rotating seat and locates the position of the rotating seat after rotation; A support seat, wherein the support seat is arranged on another of the mounting seats, and the support seat is used for fixing the free end of the crankshaft.

2. The clamp according to claim 1, characterized in that: The clamp comprises a locking member, and the rotating seat is fixed to the mounting seat through the locking member after the rotating seat is rotated.

3. The clamp according to claim 2, characterized in that: The rotating seat is provided with at least two first through holes for installing the locking member, the first through holes are distributed at intervals along the circumference around the rotation center of the rotating seat, and the locking member passes through the first through holes to fixedly connect the rotating seat and the mounting seat.

4. The clamp according to claim 1, characterized in that: At least two positioning grooves are arranged at the edge of the rotating seat, and the positioning grooves are spaced around the rotation center of the rotating seat. The positioning assembly is engaged with the side walls of the positioning grooves to position the rotating seat.

5. The clamp according to claim 4, characterized in that: The positioning assembly includes a positioning seat and a positioning adjustment member. The positioning seat is arranged on the mounting seat where the rotating seat is located. The positioning adjustment member is arranged on the positioning seat in a threaded connection manner. The positioning adjustment member can move and clamp the rotating seat.

6. The clamp according to claim 5, characterized in that: The positioning adjustment member includes a positioning screw and a positioning pin, wherein the positioning screw is movably connected to the positioning pin, the positioning screw drives the positioning pin to move back and forth, and the positioning pin can be engaged with the positioning groove or the positioning pin can be withdrawn from the positioning groove.

7. The clamp according to claim 1, characterized in that: The fixture includes a first gear and a second gear, the first gear is arranged on the mounting seat where the rotating seat is located, the second gear is fixedly arranged on the rotating seat and the second gear and the rotating seat are arranged coaxially, the first gear and the second gear are meshed for transmission and the second gear can drive the rotating seat to rotate and adjust the position.

8. The clamp according to claim 1, characterized in that: The support seat comprises a base and a top cover, the free end of the crankshaft is arranged on the base, the top cover and the base embrace the free end of the crankshaft and the top cover is fixedly connected to the base.

9. The clamp according to claim 1, characterized in that: The fixture comprises a positioning member, and the two mounting seats are both fixedly provided with the positioning member, and the positioning member is connected to a set position of the crankshaft grinder to position the mounting seat on the crankshaft grinder.

10. A crankshaft grinding machine, characterized in that: Comprising the clamp as claimed in any one of claims 1 to 9.

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