Clamp

Abstract

The clamp is used for clamping a crankshaft and comprises a shaft sleeve assembly, a fixing assembly and a positioning disc, the first end of the crankshaft penetrates into the first end of the shaft sleeve assembly, the first end of the crankshaft and the first end of the shaft sleeve assembly are fixed, the first end of the shaft sleeve assembly penetrates through the positioning disc and then is located in the fixing assembly, and the fixing assembly can conduct clamping and positioning; the shaft sleeve assembly can drive the crankshaft to move in the radial direction of the positioning disc so that the center of the eccentric circle of the crankshaft and the center of the fixing assembly can be located on the same straight line. The fixture provided by the utility model can correspond to crankshafts with different eccentricity, and when an eccentric circle is processed, the fixture does not need to be frequently replaced, and only the position of the crankshaft needs to be adjusted through the shaft sleeve assembly, so that the center of the eccentric circle of the current crankshaft and the center of the fixing assembly are positioned on the same straight line; and the influence on the machining efficiency caused by frequent replacement of the clamp is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of crankshaft processing auxiliary equipment and relates to a clamp. Background Art

[0002] The crankshaft is generally fixed on the rotating shaft of the motor through an eccentric hole, and has a wide range of applications. When machining the crankshaft, the eccentric circle on the crankshaft has always been a difficult point in machining.

[0003] When machining the eccentric circle, the crankshaft needs to be fixed by a fixture before machining. When batch machining crankshafts with different eccentricities, the traditional fixture can only position the crankshaft with a fixed eccentricity, so the crankshaft fixture with the corresponding eccentricity needs to be replaced for machining. Frequent fixture replacement reduces machining efficiency. Utility Model Content

[0004] In view of this, the utility model provides a clamp, which can correspond to crankshafts with different eccentricities, thereby solving the influence of frequent replacement of the clamp on the processing efficiency.

[0005] In order to solve the above problems, according to one aspect of the present application, an embodiment of the utility model provides a clamp for clamping a crankshaft, including a sleeve assembly, a fixing assembly and a positioning plate, the first end of the crankshaft is inserted into the first end of the sleeve assembly and the two are fixed, the first end of the sleeve assembly is located inside the fixing assembly after passing through the positioning plate, and the fixing assembly can clamp the positioning plate; the sleeve assembly can drive the crankshaft to move radially along the positioning plate so that the center of the eccentric circle of the crankshaft is in the same straight line as the center of the fixing assembly.

[0006] In some embodiments, the sleeve assembly includes a locking section and a fixed section, the fixed section has a mating piece, the locking section outer cover is provided with a locking piece for locking the crankshaft after the first end of the crankshaft passes through the first end of the sleeve assembly, the fixed section is located inside the fixed assembly after passing through the positioning plate, and the mating piece cooperates with the positioning plate to realize the movement of the sleeve assembly.

[0007] In some embodiments, the outer surface of the locking section has an external thread, and the locking section has a gap opened along the axial direction; the locking member has an internal thread; after the external thread and the internal thread are matched, the gap can be tightened or released.

[0008] In some embodiments, there are at least two gaps, and at least two gaps are evenly opened on the locking segment along the circumferential direction, and each gap runs through the axial direction of the locking segment.

[0009] In some embodiments, the fixing section extends radially outward to form the mating piece, the upper surface of the positioning plate has a groove, the middle portion of the groove has a first hole for the fixing section to pass through, the fixing section is gap-fitted with the first hole, the mating piece is located in the groove and can move along the groove, so that the sleeve assembly drives the crankshaft to move radially in the first hole.

[0010] In some embodiments, the groove has first threaded holes on both sides of the first hole, and the mating piece has U-shaped holes on both sides. The U-shaped holes cooperate with the first threaded holes to fix the mating piece and the positioning plate at different positions.

[0011] In some embodiments, the sleeve assembly also includes a positioning block, which is connected to the end of the first end of the sleeve assembly; the end of the first end of the crankshaft has a tail groove; after the first end of the crankshaft penetrates into the first end of the sleeve assembly, the tail groove cooperates with the positioning block.

[0012] In some embodiments, the positioning block includes a body having a plug-in plate, the end surface of the fixing section has a plug-in slot, and the plug-in plate cooperates with the plug-in slot.

[0013] In some embodiments, the plug plate has a step, and the step is an inclined surface for matching with the first end of the crankshaft.

[0014] In some embodiments, the fixing assembly includes a chuck having a second hole in the center thereof. After the first end of the crankshaft passes through the first end of the sleeve assembly, the first end of the sleeve assembly passes through the positioning plate and is located in the second hole and is gap-matched with the second hole.

[0015] Compared with the prior art, the clamp of the utility model has at least the following beneficial effects:

[0016] The clamp provided by the utility model is used for clamping a crankshaft, and includes a sleeve assembly, a fixing assembly and a positioning plate. The first end of the crankshaft passes through the first end of the sleeve assembly and the two are fixed. The first end of the sleeve assembly is located inside the fixing assembly after passing through the positioning plate. The fixing assembly can clamp the positioning plate. The sleeve assembly can drive the crankshaft to move radially along the positioning plate so that the center of the eccentric circle of the crankshaft and the center of the fixing assembly are in the same straight line.

[0017] When machining the eccentric circle, the first end of the crankshaft is placed into the sleeve assembly and fixed, and then the sleeve assembly can drive the crankshaft to move radially along the positioning disk so that the center of the eccentric circle of the crankshaft is in the same straight line as the center of the fixing assembly. After completing the positioning and clamping, the eccentric circle can be machined. When it is necessary to machine other eccentric circles with different eccentricities, the first end of the new crankshaft is inserted into the first end of the sleeve assembly again according to this method and the two are fixed. After the first end of the sleeve assembly passes through the positioning disk, it is located inside the fixing assembly. The fixing assembly clamps the positioning disk, and then the sleeve assembly drives the crankshaft to move radially along the positioning disk so that the center of the eccentric circle of the new crankshaft is in the same straight line as the center of the fixing assembly, and then machining can be carried out.

[0018] In other words, the fixture provided by the utility model can correspond to crankshafts with different eccentricities. When processing eccentric circles, there is no need to frequently replace the fixture. It is only necessary to adjust the position of the crankshaft through the sleeve assembly, thus solving the impact of frequent fixture replacement on processing efficiency.

[0019] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of a clamp provided by an embodiment of the utility model when it is in a working state;

[0022] Figure 2 It is an exploded view of a clamp provided in an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of a shaft sleeve assembly and a positioning plate in a clamp provided by an embodiment of the utility model after being matched;

[0024] Figure 4 It is a schematic diagram of the structure of a crankshaft, a sleeve assembly and a positioning plate in a fixture provided by an embodiment of the utility model after being matched;

[0025] Figure 5 It is a structural schematic diagram of a shaft sleeve assembly in a clamp provided by an embodiment of the utility model;

[0026] Figure 6 It is a structural schematic diagram of a positioning plate in a clamp provided by an embodiment of the utility model;

[0027] Figure 7 This is a front view of a shaft sleeve assembly and a positioning plate in a fixture provided by an embodiment of the utility model after being matched;

[0028] Figure 8 It is a structural schematic diagram of a crankshaft in a clamp provided by an embodiment of the utility model;

[0029] Fig. 9 It is a schematic diagram of the structure of a crankshaft and a positioning block in a clamp provided by an embodiment of the utility model after being matched;

[0030] Fig.10 It is a structural schematic diagram of a positioning block in a clamp provided by an embodiment of the utility model;

[0031] Fig.11 It is a cross-sectional view of a shaft sleeve assembly and a positioning plate in a clamp provided by an embodiment of the utility model after being matched.

[0032] in:

[0033] 1. crankshaft; 11. eccentric circle; 12. tail groove; 13. long shaft; 111. upper eccentric circle; 112. lower eccentric circle; 2. sleeve assembly; 21. locking section; 22. fixing section; 23. matching piece; 24. locking piece; 25. positioning block; 26. second hole; 27. second threaded hole; 28. positioning bolt; 29. ​​gasket; 211. external thread; 212. gap; 221. plug-in groove; 231. U-shaped hole; 241. internal thread; 251. body; 252. plug-in plate; 253. step; 3. fixing assembly; 4. fixing screw; 5. positioning plate; 51. groove; 52. first hole; 53. first threaded hole. DETAILED DESCRIPTION

[0034] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the specific implementation methods, structures, features and effects of the utility model application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0035] In the description of the present invention, it should be clarified that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence; the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not mean that the referred device or element must have a specific direction or position, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] This embodiment provides a clamp for clamping a crankshaft 1, such as Figure 1-11 As shown, it includes a sleeve assembly 2, a fixing assembly 3 and a positioning plate 5. The first end of the crankshaft 1 is inserted into the first end of the sleeve assembly 2 and the two are fixed. The first end of the sleeve assembly 2 is located inside the fixing assembly 3 after passing through the positioning plate 5. The fixing assembly 3 can clamp the positioning plate 5; the sleeve assembly 2 can drive the crankshaft 1 to move radially along the positioning plate 5 so that the center of the eccentric circle 11 of the crankshaft 1 is in the same straight line as the center of the fixing assembly 3.

[0038] When machining the eccentric circle 11 of the crankshaft 1, the crankshaft 1 needs to be clamped and fixed with a fixture before machining. When machining crankshafts 1 with different eccentricities in batches, since the traditional fixture can only machine crankshafts with fixed eccentricities, it is necessary to replace the crankshaft fixture with the corresponding eccentricity for machining, making the machining process more complicated.

[0039] In view of the above problems, in this embodiment, the center of the sleeve assembly 2 has a second hole 26 for fixing the long axis 13 of the crankshaft 1; the positioning disk 5 has a through hole. When the sleeve assembly 2 is matched with the positioning disk 5, the sleeve assembly 2 can move along the radial direction of the positioning disk 5 through the through hole, thereby driving the crankshaft 1 to move radially to adjust the center position of the eccentric circle 11 of the crankshaft 1 so that it is in the same straight line with the center of the fixing assembly 3. When it is necessary to process other eccentric circles 11 with different eccentricities, the first end of the new crankshaft 1 is re-inserted into the first end of the sleeve assembly 2 according to this method and the two are fixed. After the first end of the sleeve assembly 2 passes through the positioning disk 5, it is located inside the fixing assembly 3. The fixing assembly 3 clamps the positioning disk 5, and then the sleeve assembly 2 drives the crankshaft 1 to move along the radial direction of the positioning disk 5 so that the center of the eccentric circle 11 of the new crankshaft 1 is in the same straight line with the center of the fixing assembly 3, and then the processing can be carried out. In addition, during the machining process, the setting of the fixing assembly 3 plays a role in clamping the sleeve assembly 2 and the crankshaft 1, so that the crankshaft 1 rotates around it, thereby ensuring the machining accuracy.

[0040] That is to say, the fixture provided in this embodiment can correspond to crankshafts 1 with different eccentricities. When processing the eccentric circle 11, there is no need to frequently replace the fixture, thus solving the impact of frequent fixture replacement on processing efficiency.

[0041] In addition, when it is necessary to process other crankshafts 1 of different models and diameters, it is only necessary to replace the sleeve assembly 2 of the corresponding diameter, which can greatly reduce the manufacturing cost of the fixture for the eccentric circle 11 on the crankshaft 1, and the fixture is highly interchangeable.

[0042] In a specific embodiment, Figure 2 and Figure 5 As shown, the shaft sleeve assembly 2 includes a locking section 21 and a fixed section 22, the fixed section 22 has a fitting 23, and the outer movable sleeve of the locking section 21 is provided with a locking member 24, and the locking member 24 is used to lock the crankshaft 1 after the first end of the crankshaft 1 penetrates into the first end of the shaft sleeve assembly 2, and the fixed section 22 is located inside the fixed assembly 3 after passing through the positioning plate 5, and the fitting 23 cooperates with the positioning plate 5 to realize the movement of the shaft sleeve assembly 2.

[0043] Specifically, the general contours of the locking section 21 and the fixing section 22 are both cylindrical, and the two are coaxially arranged. The locking section 21 and the fixing section 22 can be integrally formed or separately arranged. Both the locking section 21 and the fixing section 22 have a through hole for the long axis 13 of the crankshaft 1 to pass through, and the two through holes are connected and coaxial. The material of the locking section 21 is elastic. In this way, when the first end of the crankshaft 1 is inserted into the through holes of the locking section 21 and the fixing section 22, the locking member 24 is sleeved on the locking section 21, which can tighten the locking section 21 and thereby fix the crankshaft 1. When the locking member 24 is removed or reacted, the locking section 21 returns to its initial state under the action of the restoring force.

[0044] In a specific embodiment, Figure 5 As shown, the outer surface of the locking section 21 has an external thread 211, and the locking section 21 has a gap 212 opened along the axial direction; Figure 2 As shown, the locking member 24 has an internal thread 241; after the external thread 211 and the internal thread 241 cooperate, the gap 212 can be tightened or released. Specifically, the outer surface of the locking segment 21 has an external thread 211 arranged along the circumferential direction, and the inner surface of the locking member 24 has an internal thread 241 arranged along the circumferential direction. In this way, after the locking member 24 is sleeved on the locking segment 21, the locking member 24 is rotated along the first direction to tighten the locking segment 21 until it is completely in contact with the crankshaft 1 in the through hole. When the crankshaft 1 needs to be replaced or the eccentric circle 11 on the crankshaft 1 is processed, the locking member 24 is rotated along the second direction, and the locking segment 21 is released and returns to the initial state. At this time, the crankshaft 1 can be taken out.

[0045] In addition, in order to make the locking section 21 more contractible and releaseable, the locking section 21 is made of a material with a certain elasticity, and a gap 212 is provided on the locking section 21, and the gap 212 is provided along the axial direction; thus, when the locking member 24 is rotated in the first direction, the gap 212 is contracted, and when the gap 212 is completely closed, it is proved that the contraction has reached the limit; conversely, when the locking member 24 is rotated in the second direction, the gap 212 is restored. Therefore, the width of the gap 212 needs to be set in advance, which depends on the diameter of the major axis 13 of the crankshaft 1, the elasticity of the material of the locking section 21 and other parameters.

[0046] In a specific embodiment, there are at least two gaps 212 , and at least two gaps 212 are evenly opened on the locking section 21 along the circumferential direction, and each gap 212 runs through the axial direction of the locking section 21 .

[0047] For example, Figure 3As shown, four gaps 212 are provided, and the four gaps 212 are evenly distributed on the locking section 21 along the circumferential direction, that is, there is an angle of 90° between adjacent gaps 212. On the basis of ensuring the structural strength of the locking section 21, more gaps 212 can make the contraction of the locking section 21 more uniform, thereby making the force applied to the crankshaft 1 in all directions more uniform, which is conducive to fixing the crankshaft 1.

[0048] In a specific embodiment, Figure 2 and Figure 7 As shown, the fixing section 22 extends radially outward to form the matching piece 23, and the upper surface of the positioning plate 5 has a groove 51. Figure 6 As shown, the middle part of the groove 51 has a first hole 52 for the fixing section 22 to pass through, the fixing section 22 is clearance-matched with the first hole 52, the fitting 23 is located in the groove 51 and can move along the groove 51, so that the sleeve assembly 2 drives the crankshaft 1 to move radially in the first hole 52.

[0049] The general outline of the positioning plate 5 is a columnar structure with a certain thickness. On the side of the columnar structure away from the fixing component 3, there is an inwardly recessed groove 51. The groove 51 extends from one end of the positioning plate 5 to the other end and is located in the middle of the positioning plate 5. At the same time, the groove 51 also has a first hole 52 that penetrates the axial direction of the positioning plate 5.

[0050] The general contour of the fitting 23 is similar to the straight-shaped shoulder provided on the fixing section 22 .

[0051] In a specific embodiment, Figure 6 and Figure 7 As shown, on the groove 51, there are first threaded holes 53 on both sides of the first hole 52, and on both sides of the matching piece 23 there are U-shaped holes 231, and the U-shaped holes 231 cooperate with the first threaded holes 53 to achieve the fixation of the matching piece 23 and the positioning plate 5 at different positions.

[0052] During the radial movement of the sleeve assembly 2, the first threaded hole 53 corresponds to different positions of the U-shaped hole 231, but because the U-shaped hole 231 has a certain length, within a certain movement range, the first threaded hole 53 and the U-shaped hole 231 have an overlapping portion. At this time, the positioning plate 5 and the sleeve assembly 2 can be fixed by the combination of the positioning bolts 28 and the gaskets 29.

[0053] In a specific embodiment, Figure 2 and Figure 3As shown, the shaft sleeve assembly 2 also includes a positioning block 25, and the positioning block 25 is connected to the end of the first end of the shaft sleeve assembly 2; the end of the first end of the crankshaft 1 has a tail groove 12; after the first end of the crankshaft 1 penetrates into the first end of the shaft sleeve assembly 2, the tail groove 12 cooperates with the positioning block 25.

[0054] During the installation process, the positioning block 25 is first fixed to the bottom of the fixed section 22 of the sleeve assembly 2 by the fixing screw 4. After the crankshaft 1 passes through the sleeve assembly 2, the tail groove 12 at the long axis end of the crankshaft 1 is matched with the step 253 of the positioning block 25 to clamp the crankshaft 1, thereby achieving the purpose of quickly positioning the crankshaft 1.

[0055] In a specific embodiment, Fig.10 As shown, the positioning block 25 includes a body 251, and the body 251 has a plug board 252. Figure 5 As shown, the end surface of the fixing section 22 has a plug-in slot 221, and the plug-in plate 252 cooperates with the plug-in slot 221. The body 251 and the plug-in plate 252 are integrally formed. The plug-in plate 252 first matches with the plug-in slot 221 to achieve the connection and fixation of the positioning block 25 and the shaft sleeve assembly 2. After the crankshaft 1 is inserted into the shaft sleeve assembly 2, the tail groove 12 at the end of the crankshaft 1 cooperates with the plug-in plate 252 to achieve the fixation of the crankshaft 1.

[0056] In a specific embodiment, the plug plate 252 has a step 253 , and in order to cooperate with the inclined surface of the end of the crankshaft 1 , the step 253 is an inclined surface for cooperating with the first end of the crankshaft 1 .

[0057] In a specific embodiment, the fixing assembly 3 includes a chuck, the center of which has a second hole, and after the first end of the crankshaft 1 penetrates the first end of the sleeve assembly 2, the first end of the sleeve assembly 2 passes through the positioning plate 5 and is located in the second hole and is in clearance fit with the second hole. The chuck may be a three-jaw chuck, which plays a role in clamping the sleeve assembly 2 and the crankshaft 1.

[0058] This embodiment provides a clamp, and the sleeve assembly 2 is designed according to the outer diameter size of the long axis 13 of the crankshaft 1. The sleeve assembly 2 has a second hole 26 in the middle, which is a clearance fit with the long axis end of the crankshaft 1. The middle part of the sleeve assembly 2 has a straight shoulder, that is, the above-mentioned matching piece 23. The bottom surface of the sleeve assembly 2 reserves a second threaded hole 27. The front end of the sleeve assembly 2, that is, the locking section 21, has an external thread 211, and the locking section 21 has a gap 212. When the locking piece 24 is sleeved on the locking section 21, the crankshaft 1 can be clamped. The positioning block 25 is connected to the sleeve assembly 2 by a fixing screw 4. The step 253 of the positioning block 25 has a certain slope, which can cooperate with the tail groove 12 of the long axis end of the crankshaft 1 to clamp the crankshaft 1 and is used to quickly position the crankshaft 1.

[0059] The working process of the clamp provided in this embodiment is as follows:

[0060] During installation, the positioning block 25 is first fixed to the fixed section 22 of the sleeve assembly 2 by the fixing screw 4. After the crankshaft 1 passes through the sleeve assembly 2, the tail groove 12 of the long axis end of the crankshaft 1 is matched with the step 253 of the positioning block 25 to clamp the crankshaft 1, so as to achieve the effect of quickly positioning the crankshaft 1; and then the locking member 24 is used to lock the crankshaft 1. Since the middle of the positioning plate 5 is a U-shaped groove 51, the groove 51 can adjust the offset and offset direction of the sleeve assembly 2 in the first hole 52 of the positioning plate 5 after the matching member 23 is matched. After adjusting the offset and direction, the positioning plate 5 and the sleeve assembly 2 are fixed by the combination of the positioning bolt 28 and the gasket 29.

[0061] In the above process, since the opening direction of the tail groove 12 of the crankshaft 1 is the same as the eccentric direction of the upper eccentric circle 11 of the crankshaft 1, the fitting 23 is parallel to the groove 51 in the middle of the positioning plate 5, and the sleeve assembly 2 can move radially in the first hole 52 of the positioning plate 5, it is only necessary to adjust the sleeve assembly 2 along the positioning plate 5 The same offset amount of the upper eccentric circle of the crankshaft, the offset direction of the sleeve assembly 2 is opposite to the offset direction of the upper eccentric circle 111 of the crankshaft, since the upper and lower eccentric circles 112 and the upper eccentric circle 111 have the same eccentricity and opposite eccentricity directions, the lower eccentric circle 112 is also based on the above principle to ensure that the center of the circle is on the same straight line.

[0062] In addition, the setting of the chuck plays a role in clamping the sleeve assembly 2 and the crankshaft 1.

[0063] The specific processing process is as follows: before processing the upper eccentric circle 111 of the crankshaft 1, the offset of the sleeve assembly 2 along the groove 51 and the first hole 52 on the positioning plate 5 is adjusted according to the eccentricity of the upper eccentric circle 111 of the crankshaft 1. When the offset of the sleeve assembly 2 relative to the center of the positioning plate 5 is equal to the eccentricity of the upper eccentric circle 111 of the crankshaft 1, the sleeve assembly 2 is clamped with a chuck to fix the crankshaft 1 on the sleeve assembly 2, so that the center of the upper eccentric circle 111 of the crankshaft 1 is coaxial with the center of the chuck. line, so the upper eccentric circle 111 of the crankshaft 1 can be easily processed; when processing the lower eccentric circle 112 of the crankshaft 1, since the upper eccentric circle 111 and the lower eccentric circle 112 of the crankshaft 1 have the same eccentricity and opposite eccentricity, it is only necessary to remove the sleeve assembly 2 and the crankshaft 1 from the chuck, loosen the locking piece 24 and the fixing screw 4, fix the sleeve assembly 2, and then flip the crankshaft 1 and the positioning block 25 180° at the same time, and reinstall them to process the lower eccentric circle 112 of the crankshaft 1.

[0064] For example, when batch processing the same type of crankshafts 1, it is only necessary to loosen and tighten the locking piece 24, remove the crankshaft 1 and replace it with the next crankshaft 1 for processing. The upper eccentric circles 111 of the crankshaft 1 of this type can be batch processed first, and then the lower eccentric circles 112 can be processed according to the above steps, which can improve the processing efficiency.

[0065] When batch processing crankshafts of other different models and diameters is performed, it is only necessary to replace the sleeve assembly 2 of the corresponding diameter, which can greatly reduce the manufacturing cost and the fixture has high interchangeability.

[0066] The clamp provided in this embodiment has a simple structure and is easy to manufacture and install. It can greatly reduce the types of crankshaft clamps and can provide a stable clamping force. When processed on a CNC lathe, the crankshaft clamp can be universalized, the processing efficiency can be improved, and the needs of rapid switching of mass production of different models can be met.

[0067] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous technical features can be freely combined and superimposed.

[0068] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A clamp, characterized in that: Used to clamp a crankshaft, it includes a sleeve assembly, a fixing assembly and a positioning plate. The first end of the crankshaft passes through the first end of the sleeve assembly and the two are fixed. The first end of the sleeve assembly is located inside the fixing assembly after passing through the positioning plate. The fixing assembly can clamp the positioning plate; the sleeve assembly can drive the crankshaft to move radially along the positioning plate so that the center of the eccentric circle of the crankshaft and the center of the fixing assembly are in the same straight line.

2. The clamp according to claim 1, characterized in that: The shaft sleeve assembly includes a locking section and a fixed section, the fixed section has a mating piece, the locking section outer cover is provided with a locking piece for locking the crankshaft after the first end of the crankshaft passes through the first end of the shaft sleeve assembly, the fixed section is located inside the fixed assembly after passing through the positioning plate, and the mating piece cooperates with the positioning plate to realize the movement of the shaft sleeve assembly.

3. The clamp according to claim 2, characterized in that: The outer surface of the locking section has an external thread, and the locking section has a gap opened along the axial direction; the locking piece has an internal thread; after the external thread and the internal thread are matched, the gap can be tightened or released.

4. The clamp according to claim 3, characterized in that: There are at least two gaps, and at least two gaps are evenly arranged on the locking section along the circumferential direction, and each gap runs through the axial direction of the locking section.

5. The clamp according to claim 2, characterized in that: The fixing section extends radially outward to form the mating piece, the upper surface of the positioning plate has a groove, the middle part of the groove has a first hole for the fixing section to pass through, the fixing section is gap-matched with the first hole, the mating piece is located in the groove and can move along the groove, so that the sleeve assembly drives the crankshaft to move radially in the first hole.

6. The clamp according to claim 5, characterized in that On the groove, there are first threaded holes on both sides of the first hole, and on both sides of the matching piece there are U-shaped holes, which cooperate with the first threaded holes to achieve fixation of the matching piece and the positioning plate at different positions.

7. The clamp according to claim 2, characterized in that: The sleeve assembly also includes a positioning block, which is connected to the end of the first end of the sleeve assembly; the end of the first end of the crankshaft has a tail groove; after the first end of the crankshaft penetrates into the first end of the sleeve assembly, the tail groove cooperates with the positioning block.

8. The clamp according to claim 7, characterized in that: The positioning block comprises a body, a plug-in plate is provided on the body, an end surface of the fixing section has a plug-in slot, and the plug-in plate matches with the plug-in slot.

9. The clamp according to claim 8, characterized in that The plug board is provided with a step, and the step is an inclined surface for matching with the first end of the crankshaft.

10. The clamp according to any one of claims 1 to 9, characterized in that: The fixing assembly includes a chuck having a second hole at the center thereof. After the first end of the crankshaft penetrates into the first end of the sleeve assembly, the first end of the sleeve assembly passes through the positioning plate and is located in the second hole and is gap-matched with the second hole.

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