A general machine crankshaft turning eccentric crank handle clamp

Abstract

The utility model relates to machine crankshaft crank machining technical field, concretely relates to a machine crankshaft eccentric crank clamp, including clamp body, first fixed part, movable bottom plate, collet pull plate, pull cover, spring collet, cone cover, second fixed part, locating cap, crank positioning block, counterweight block, multiple counterweight bars and adjusting screw, first, the clamp body is designed as small volume and is convenient to adjust the change type through the first fixed part, second, the movable bottom plate can be adjusted up and down through the adjusting screw, ensure the accurate stability of eccentric distance, reduce the processing allowance of subsequent crank grinding process, in addition, a plurality of counterweight bars are arranged on the counterweight block, the corresponding counterweight bar can be replaced according to different models of products, the gravity center of the clamp is basically coincident with the lathe spindle, effectively reduces or eliminates centrifugal force, reduces the lathe vibration.

Description

Technical Field

[0001] This utility model relates to the field of general-purpose crankshaft and crankpin machining technology, and in particular to a general-purpose crankshaft machining eccentric crankpin fixture. Background Technology

[0002] In the field of machining, especially in the turning process of crankshafts and crankpins for general-purpose machines, existing crankpin fixtures have achieved the positioning and clamping functions of crankshafts to a certain extent, providing basic support for automated turning. Through specific structural designs, these fixtures can fix the crankshaft in the working position of the CNC lathe, enabling the lathe to perform precise turning of the crankpin according to a preset program, improving machining efficiency and product consistency, and meeting the basic needs of some markets for general-purpose machine crankshafts.

[0003] However, existing general-purpose crankshaft crank jigs still have many shortcomings. First, the jig is quite large, which not only occupies a lot of machine tool workspace, but also makes the adjustment process cumbersome and complicated when different models of products need to be processed. Second, the eccentricity dimension is not stable, which means that a large machining allowance needs to be reserved in the subsequent crankshaft grinding process. In addition, due to the design defects of the jig, when the lathe rotates at high speed, the jig's center of gravity deviates from the center of the lathe spindle, which generates a large centrifugal force and causes the lathe to vibrate. Utility Model Content

[0004] The purpose of this utility model is to provide a general-purpose crankshaft machining eccentric crank jig, aiming to solve the following problems in the prior art: First, the jig is relatively large, which not only occupies a lot of machine tool working space, but also makes the adjustment process cumbersome and complicated when different models of products need to be processed; second, the eccentricity dimension is not stable, which requires a large machining allowance in the subsequent crankshaft grinding process; in addition, due to the defects in the jig design, when the lathe rotates at high speed, the jig's center of gravity deviates from the lathe spindle center, which generates a large centrifugal force and causes lathe vibration.

[0005] To achieve the above objectives, this utility model employs a general-purpose crankshaft machining eccentric crank clamp, comprising a clamp body. A movable base plate is provided on the front end face of the clamp body via a first fixing member. A collet pull plate is provided on one end face of the movable base plate. A pull sleeve is slidably provided on the end of the collet pull plate away from the movable base plate. A spring collet is provided on the end of the collet pull plate near the movable base plate. A conical sleeve is provided on the other end face of the movable base plate, and the conical sleeve is fitted onto the spring collet. A positioning cover and a crank positioning block are provided on the end of the conical sleeve away from the movable base plate via a second fixing member, and the positioning cover abuts against the spring collet. A counterweight block is also provided on the front end face of the clamp body, and the counterweight block is located below the movable base plate. Multiple counterweight bars are provided on the front end face of the counterweight block, and an adjusting screw is provided between the counterweight block and the movable base plate.

[0006] The first fixing component includes multiple double-ended bolts, each of which is provided with a nut. The movable base plate has adjustment grooves on both sides, and the multiple double-ended bolts are respectively disposed in the corresponding adjustment grooves, with the nuts abutting against the front end face of the movable base plate.

[0007] The collet pull plate has a sliding groove seat at one end away from the movable base plate, one end of the pull sleeve has an internal thread adapted to the hydraulic cylinder pull rod of the lathe spindle, and the other end of the pull sleeve is provided with a slider, which is slidably disposed in the sliding groove seat.

[0008] The second fixing component includes multiple fixing bolts, and both the positioning cover and the crank positioning block are set at the end of the cone sleeve away from the movable base plate by multiple fixing bolts.

[0009] The inner edge of the conical sleeve has a first conical surface, and the outer edge of the spring collet has a second conical surface, with the first conical surface abutting against the second conical surface.

[0010] This utility model discloses a machining fixture for eccentric crankshafts on a general-purpose crankshaft lathe. The fixture body includes a fixture body with a movable base plate mounted on its front end face via a first fixing member. A collet pull plate is mounted on one end face of the movable base plate, and a pull sleeve is slidably mounted on the end of the collet pull plate away from the movable base plate. A spring collet is mounted on the end of the collet pull plate near the movable base plate. A conical sleeve is mounted on the other end face of the movable base plate and fits onto the spring collet. A positioning cover and a crankshaft positioning block are mounted on the end of the conical sleeve away from the movable base plate via a second fixing member, with the positioning cover abutting against the spring collet. The front end face of the fixture body also includes... The fixture includes a counterweight located below the movable base plate. Multiple counterweight bars are mounted on the front face of the counterweight, and an adjusting screw is installed between the counterweight and the movable base plate. Firstly, the fixture body is designed to be small in size and easily adjustable via the first fixing component. Secondly, the movable base plate can be adjusted up and down via the adjusting screw to ensure precise and stable eccentricity, reducing machining allowance in subsequent crankshaft grinding processes. Furthermore, the multiple counterweight bars on the counterweight allow for replacement of corresponding counterweight bars according to different product models, ensuring the fixture's center of gravity is approximately aligned with the lathe spindle, effectively reducing or eliminating centrifugal force and lowering lathe vibration. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a three-dimensional perspective view of the eccentric crankshaft machining fixture of this utility model.

[0013] Figure 2 This is a front view of the eccentric crankshaft machining fixture for general-purpose crankshafts according to this utility model.

[0014] Figure 3 This is the utility model Figure 2 A cross-sectional view along line AA in the middle.

[0015] Figure 4 This is the utility model Figure 3 A magnified view of a section at point B.

[0016] Figure 5 This is the utility model Figure 3 A cross-sectional view of the CC line.

[0017] Figure 6This is a three-dimensional perspective view of the eccentric crankshaft body installed in the machining fixture for general-purpose crankshafts of this utility model.

[0018] Figure 7 This is a schematic diagram showing the disassembled design of the eccentric crankshaft machining fixture for general-purpose crankshafts according to this utility model.

[0019] 1-Clamp body, 2-Modible base plate, 3-Collet pull plate, 4-Pull sleeve, 5-Spring collet, 6-Conical sleeve, 7-Positioning cover, 8-Crank positioning block, 9-Counterweight block, 10-Counterweight bar, 11-Adjusting screw, 12-Double-ended bolt, 13-Nut, 14-Adjusting groove, 15-Slide seat, 16-Internal thread, 17-Slider, 18-Fixing bolt, 19-First conical surface, 20-Second conical surface, 21-Through crankshaft body. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0021] Please see Figures 1 to 7 This utility model provides a machining fixture for eccentric cranks on a general-purpose crankshaft lathe, including a fixture body 1. A movable base plate 2 is provided on the front end face of the fixture body 1 via a first fixing member. A collet pull plate 3 is provided on one end face of the movable base plate 2. A pull sleeve 4 is slidably provided on the end of the collet pull plate 3 away from the movable base plate 2. A spring collet 5 is provided on the end of the collet pull plate 3 near the movable base plate 2. A conical sleeve 6 is provided on the other end face of the movable base plate 2, and the conical sleeve 6 is fitted onto the spring collet 5. A positioning cover 7 and a crank positioning block 8 are provided on the end of the conical sleeve 6 away from the movable base plate 2 via a second fixing member, and the positioning cover 7 abuts against the spring collet 5. A counterweight block 9 is also provided on the front end face of the fixture body 1, and the counterweight block 9 is located below the movable base plate 2. A plurality of counterweight bars 10 are provided on the front end face of the counterweight block 9, and an adjusting screw 11 is provided between the counterweight block 9 and the movable base plate 2.

[0022] In this embodiment, by optimizing the fixture structure design, the fixture volume is significantly reduced, solving the problem of the original fixture's large volume occupying machine tool space. The movable base plate 2 achieves quick change and adjustment through the cooperation of the double-headed bolt 12 and the adjustment groove 14. The conical surface cooperation design of the spring collet 5 and the conical sleeve 6 ensures clamping stability. At the same time, the combination of the counterweight block 9 and the counterweight bar 10 effectively solves the centrifugal force problem during high-speed rotation, making the fixture's center of gravity coincide with the lathe spindle, reducing vibration, and improving machining accuracy and equipment life.

[0023] Furthermore, the first fixing member includes a plurality of double-ended bolts 12, each of which is provided with a nut 13. The movable base plate 2 has adjustment grooves 14 on both sides. The plurality of double-ended bolts 12 are respectively disposed in the corresponding adjustment grooves 14, and the nuts 13 abut against the front end face of the movable base plate 2.

[0024] In this embodiment, the combination of the double-headed bolt 12 and nut 13, along with the design of the adjustment grooves 14 on both sides of the movable base plate 2, enables flexible adjustment and quick fixation of the movable base plate 2. This structure not only simplifies the adjustment steps during model change, but also improves the accuracy and stability of the adjustment, effectively solving the problem of cumbersome and complicated adjustment of the original fixture model change.

[0025] Furthermore, the end of the collet pull plate 3 away from the movable base plate 2 has a sliding groove seat 15, one end of the pull sleeve 4 has an internal thread 16 adapted to the hydraulic cylinder pull rod of the lathe spindle, and the other end of the pull sleeve 4 is provided with a slider 17, which is slidably disposed in the sliding groove seat 15.

[0026] In this embodiment, the sliding fit design between the slide block 17 on the pull sleeve 4 and the slide seat 15 achieves a stable connection and flexible movement between the pull sleeve 4 and the collet pull plate 3. This structure ensures the smoothness and accuracy of clamping force transmission, improves the working reliability and clamping accuracy of the fixture, and helps to reduce errors in the processing.

[0027] Furthermore, the second fixing member includes a plurality of fixing bolts 18, and the positioning cover 7 and the crank positioning block 8 are both set at the end of the cone sleeve 6 away from the movable base plate 2 by a plurality of fixing bolts 18.

[0028] In this embodiment, the positioning cover 7 and the crank positioning block 8 are securely fixed to the cone sleeve 6 by multiple fixing bolts 18, which enhances the overall structural strength and rigidity of the fixture. This design helps to maintain the stability of the fixture during the processing, reduces processing errors caused by vibration or loosening, improves processing quality and efficiency, and also facilitates the subsequent replacement of the spring collet 5.

[0029] Furthermore, the inner edge of the cone sleeve 6 has a first cone surface 19, and the outer edge of the spring collet 5 has a second cone surface 20, with the first cone surface 19 abutting against the second cone surface 20.

[0030] In this embodiment, the automatic tightening function of the spring collet 5 under force is achieved by the contact and cooperation between the first conical surface 19 of the inner edge of the conical sleeve 6 and the second conical surface 20 of the outer edge of the spring collet 5. This design not only improves the stability and reliability of clamping, but also reduces the eccentricity error during clamping through the automatic centering characteristic of the conical surface cooperation, further improving the processing accuracy.

[0031] In this utility model, firstly, the internal thread 16 of the pull sleeve 4 is connected to the hydraulic cylinder pull rod of the lathe spindle to provide clamping power; then, the crankshaft to be machined is installed into the spring collet 5 in the spindle hole of the fixture body 1, and the hydraulic cylinder pull rod is activated to drive the relevant parts to move. The first conical surface 19 of the tapered sleeve 6 contacts the second conical surface 20 of the spring collet 5 to receive force, so that the right end clamping part of the spring collet 5 is tightened to clamp the workpiece; when changing models, the positioning cover 7 can be removed and the corresponding spring collet 5 can be replaced according to the diameter of the different crankshaft clamping parts. The double-ended bolt 12 is loosened and the movable base plate 2 is adjusted up and down by adjusting the adjusting screw 11 to change the eccentricity. At the same time, the corresponding counterweight bar 10 is replaced according to the product model so that the center of gravity of the fixture is basically coincident with the lathe spindle. Finally, the program is started for machining.

[0032] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A fixture for machining eccentric crankshafts on a general-purpose crankshaft lathe, characterized in that, The fixture includes a clamp body. A movable base plate is provided on the front end face of the clamp body via a first fixing member. A collet pull plate is provided on one end face of the movable base plate. A pull sleeve is slidably provided on the end of the collet pull plate away from the movable base plate. A spring collet is provided on the end of the collet pull plate near the movable base plate. A conical sleeve is provided on the other end face of the movable base plate and is fitted onto the spring collet. A positioning cover and a crank positioning block are provided on the end of the conical sleeve away from the movable base plate via a second fixing member. The positioning cover abuts against the spring collet. A counterweight is also provided on the front end face of the clamp body and is located below the movable base plate. Multiple counterweight bars are provided on the front end face of the counterweight. An adjusting screw is provided between the counterweight and the movable base plate.

2. The machining fixture for eccentric crankshafts on a general-purpose crankshaft lathe as described in claim 1, characterized in that, The first fixing component includes multiple double-ended bolts, each of which is provided with a nut. The movable base plate has adjustment grooves on both sides, and the multiple double-ended bolts are respectively disposed in the corresponding adjustment grooves, with the nuts abutting against the front end face of the movable base plate.

3. The machining fixture for eccentric crankshafts on a general-purpose crankshaft lathe as described in claim 2, characterized in that, The collet pull plate has a sliding groove seat at one end away from the movable base plate, and one end of the pull sleeve has an internal thread adapted to the hydraulic cylinder pull rod of the lathe spindle. The other end of the pull sleeve is provided with a slider, and the slider is slidably disposed in the sliding groove seat.

4. The machining fixture for eccentric crankshafts on a general-purpose crankshaft lathe as described in claim 3, characterized in that, The second fixing member includes multiple fixing bolts, and both the positioning cover and the crank positioning block are set at the end of the cone sleeve away from the movable base plate by multiple fixing bolts.

5. The machining fixture for eccentric crankshafts on a general-purpose crankshaft lathe as described in claim 4, characterized in that, The inner edge of the cone sleeve has a first cone surface, and the outer edge of the spring collet has a second cone surface, with the first cone surface abutting against the second cone surface.

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