A fixture system for rotating shaft-like parts about an axis

Abstract

The utility model discloses a kind of clamps system of driving shaft class parts around axis rotation, belong to precision grinding machine clamp technology, existing clamp for high-precision shaft class parts grinding either difficult to realize automatic feeding and discharging, either have loss positioning accuracy, either rotation rigidity is insufficient, the utility model is equipped with including clamping component, force component and rotary joint component clamp assembly by being coaxial in the end of rotating main shaft, clamping component and force component are fixedly assembled in rotating main shaft to rotate with rotating main shaft, clamping component has the clamping part for clamping part, force component has annular sealing cavity and as the elastic body of annular sealing cavity inner wall, elastic body is sleeved outside clamping part, rotary joint component is rotationally arranged relative to clamping component and force component and is equipped with the pipe interface of pressure fluid input to annular sealing cavity. Its structure is simple, clamping force is big and circumferential rotation rigidity is enough, it is convenient to realize automation, and it does not affect the positioning accuracy of original double top of part.

Description

Technical Field

[0001] This utility model belongs to the field of precision grinding machine fixture technology, specifically relating to a fixture system that drives shaft-type parts to rotate around an axis, suitable for rapid loading and unloading of shaft-type parts and high-precision grinding of their outer surfaces. Background Technology

[0002] In recent years, with the rise of new energy vehicles, humanoid robots, and robot dog industries, the demand for various shaft parts, especially high-precision shaft parts, has been increasing day by day.

[0003] Grinding high-precision shaft parts requires two centers to support the center holes at both ends of the shaft part. The traditional method is to clamp a chuck at the end of the shaft part and then use the machine tool's power head to rotate the part to achieve grinding. However, the process of clamping and unclamping the chuck is difficult to automate and is inefficient.

[0004] While using diaphragm chucks, pneumatic chucks, spring chucks, floating chucks, etc., can improve work efficiency, it can lead to "over-positioning" of the radial positioning accuracy of the parts, affecting and interfering with the positioning reference of the center hole, resulting in a decrease in accuracy.

[0005] The method of using an overrunning clutch to drive the rotation of shaft parts is convenient for automation and has high efficiency. However, the circumferential stiffness of the driving parts is insufficient, which cannot meet the requirements for machining some parts that require uniform rotation speed, such as threads and lead screws. Utility Model Content

[0006] This invention addresses the shortcomings of existing fixtures used for grinding high-precision shaft parts, such as difficulty in achieving automated loading and unloading, loss of positioning accuracy, or insufficient rotational stiffness. It provides a fixture system that drives shaft parts to rotate around an axis, aiming to drive the shaft parts to rotate with high circumferential stiffness without compromising the positioning accuracy of the double centers, and is also suitable for rapid automated loading and unloading.

[0007] To achieve the above objectives, the clamping system of this utility model for driving shaft-type parts to rotate around an axis includes: Rotary spindle; A clamping assembly, coaxially mounted at the end of a rotating spindle, includes a clamping member, a force-applying member, and a rotary joint member. The clamping member and the force-applying member are fixedly assembled to the rotating spindle for rotating together with the rotating spindle. The clamping member has a clamping portion for clamping parts, and the force-applying member has an annular sealing cavity and an elastic body serving as the inner wall of the annular sealing cavity. The elastic body is sleeved on the radially outer surface of the clamping portion. The rotary joint member is rotatably configured relative to the clamping member and the force-applying member and is provided with a pipe interface for inputting pressurized fluid into the annular sealing cavity. The tip is located radially inside the rotating spindle and extends toward the clamping part.

[0008] Therefore, when grinding the outer surface of shaft parts, the two ends of the shaft parts are supported by two centers, and the pressurized fluid is filled into the annular sealing cavity through the pipe interface of the rotary joint component. This causes the elastic body to deform and tighten the clamping part to clamp the shaft parts, thereby making the shaft parts rotate synchronously with the rotating spindle.

[0009] This clamping system uses two centers supporting the center holes at both ends of a shaft-like part to achieve axial positioning and clamping. The system only drives the shaft-like part to rotate in the circumferential clamping direction, ensuring high rigidity in this direction and preserving the positioning accuracy of the two centers. The system clamps the part by filling a ring-shaped sealed cavity with pressurized fluid and releases the shaft-like part by depressurizing the cavity. It is easy to control and suitable for rapid, automated loading and unloading.

[0010] The tip can be fixedly assembled with the rotary spindle to achieve synchronous rotation; or it can maintain relative rotation with the rotary spindle, with the tip fixed when the rotary spindle rotates.

[0011] The clamping component and the force-applying component are fixedly assembled to the rotating spindle, either directly or indirectly, or one is directly assembled and the other is indirectly assembled.

[0012] Preferably, the rotary joint component is rotatably assembled to the clamping component and / or the force-applying component. While the clamping component and the force-applying component rotate together with the main shaft, the rotary joint component remains fixed, facilitating pipe interface connection to an external pipe interface providing pressurized fluid.

[0013] Preferably, the pipe interface of the rotary joint component is connected to the sealing cavity through a channel on the clamping component and / or the force-applying component. Providing a channel on the clamping component and / or the force-applying component, so that the channel rotates with the clamping component and / or the force-applying component, can ensure the rotational balance of the clamping assembly and avoid the additional pipe interface from being entangled or twisted.

[0014] Preferably, the force-applying component includes a skeleton, with an elastomer fixedly assembled to the skeleton and located radially inside the skeleton, and an annular sealing cavity defined between the skeleton and the elastomer. This ensures the sealing performance of the annular sealing cavity. Preferably, a rotary joint component is coaxially fitted onto the radially outer surface of the skeleton, and the rotary joint component and / or the skeleton has an annular groove for connecting the pipe interface. The skeleton has several through holes, through which the annular sealing cavity communicates with the annular groove. This ensures smooth communication between the pipe interface of the rotary joint component and the annular sealing cavity. In particular, pressurized fluid can be quickly injected into and depressurized from the annular sealing cavity using only a single pipe interface.

[0015] Preferably, the clamping member includes a flange fixedly mounted to the rotating spindle, with the clamping portion extending axially from the flange. Accordingly, while ensuring strength, the clamping portion can maintain a large deformability. For example, the clamping portion can be a deformable sleeve or a plurality of arc-shaped lobes distributed circumferentially.

[0016] Preferably, the pressure fluid is a high-pressure liquid or gas.

[0017] Preferably, the rotary joint component is coaxially rotatably mounted on the clamping component and / or the force-applying component via a support component to achieve rotation relative to the clamping component and the force-applying component. The support component includes, but is not limited to, rolling elements, rolling bearings, and sliding bearings.

[0018] Preferably, the rotary joint component is provided with an exhaust port communicating with the annular sealing cavity. Air inside the annular sealing cavity is expelled when pressurized fluid is introduced into it; this is particularly suitable when the pressurized fluid is a high-pressure liquid.

[0019] This invention relates to a fixture assembly coaxially mounted at the end of a rotating spindle, comprising a clamping member, a force-applying member, and a rotary joint member. The clamping and force-applying members are fixedly mounted on the rotating spindle for rotation with it. The clamping member has a clamping portion for clamping parts, and the force-applying member has an annular sealing cavity and an elastic body serving as the inner wall of the annular sealing cavity. The elastic body is fitted onto the radially outer surface of the clamping portion. The rotary joint member is rotatably configured relative to the clamping and force-applying members and has a pipe interface for inputting pressurized fluid into the annular sealing cavity. A tip extending towards the clamping portion is also constructed on the radially inner side of the rotating spindle. Pressurized fluid is introduced into the annular sealing cavity through the pipe interface of the rotary joint member, causing the elastic body to deform and tighten the clamping portion to clamp the shaft-like parts, thereby causing the shaft-like parts to rotate synchronously with the rotating spindle. This fixture system achieves axial positioning and clamping of the shaft-like parts by using two tips supporting the center holes at both ends of the shaft-like parts. The fixture system only drives the rotation of the shaft-like parts in the circumferential direction, ensuring high rigidity of the circumferential clamping drive without compromising the positioning accuracy of the two tips. This clamping system clamps shaft-type parts by filling the annular sealing cavity with pressurized fluid and releasing the annular sealing cavity to loosen them. It is easy to control and suitable for rapid automated loading and unloading. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the clamping system of this utility model; Figure 2 for Figure 1 A schematic diagram of the central rotary spindle and the center point; Figure 3 for Figure 1 An enlarged schematic diagram of the clamping components; Figure 4 for Figure 3 An enlarged schematic diagram of the clamping components; Figure 5 for Figure 3 A schematic diagram of the rotary joint component; Figure 6 for Figure 3 A schematic diagram of the clamping components; Figure 7 This is a schematic diagram of another clamping component of this utility model; Explanation of the labels in the diagram: 1. Rotary spindle; 2. Fixture assembly 21 top, 22 Clamping component, 221 Clamping part, 2211 Sleeve, 2212 Arc-shaped petal, 222 Flange. 23 Force-applying component, 231 Annular sealing cavity, 232 skeleton, 2321 through hole, 233 elastic body. 24 Rotary joint component, 241 Pipe interface, 242 Exhaust port, 243 Annular groove, 25 supporting components; 3-axis parts. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this utility model are intended to cover non-exclusive inclusion, such as a method or product that includes a series of technical features, not limited to those technical features explicitly listed, but also including other technical features that may be included in the method or product but not explicitly listed.

[0023] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings.

[0024] Figure 1 A clamping system is shown that drives shaft-type parts to rotate about an axis, including a rotary spindle 1, a clamping assembly 2, and a center.

[0025] The rotating spindle 1 provides the power to rotate about the axis.

[0026] The clamp assembly 2 is coaxially mounted at the end of the rotating spindle 1. The clamp assembly includes a clamping member 22, a force-applying member 23, and a rotary joint member 24. The clamping member 22 and the force-applying member 23 are fixedly assembled to the rotating spindle 1 to rotate together with the rotating spindle 1. In the illustrated structure, the clamping member 22 is fixedly assembled to the end face of the rotating spindle 1 via a flange, and the force-applying member 23 is fixedly assembled to the clamping member 22. Fasteners such as countersunk bolts are preferred for their fixed assembly.

[0027] like Figure 6-7 As shown, the clamping member 22 has a clamping portion 221 for clamping the parts. As... Figure 4 As shown, the force-applying member 23 has an annular sealing cavity 231 and an elastic body 233 serving as the inner wall of the annular sealing cavity 231. The elastic body 233 is as follows... Figure 3 The rotary joint member 24 is rotatably configured relative to the clamping member 22 and the force-applying member 23 and is provided with a pipe interface 241 for inputting pressurized fluid into the annular sealing cavity 231.

[0028] The tip 21 is located radially inside the rotating spindle 1 and extends toward the clamping part 221. The tip 21 is used to support the center holes at both ends of the shaft-like parts, so the tip is only one of two tips, the other being coaxial with and facing the tip shown in the figure.

[0029] Therefore, when grinding the outer surface of a shaft-like part, the two ends of the shaft-like part 3 are supported by two centers, and pressurized fluid is injected into the annular sealing cavity 231 through the pipe interface 241 of the rotary joint component 24. This causes the elastic body 232 to deform and tighten the clamping part 221 to clamp the shaft-like part 3, thereby causing the shaft-like part 3 to rotate synchronously with the rotating spindle 1. The pressurized fluid is a high-pressure liquid or gas.

[0030] This clamping system uses two centers supporting the center holes at both ends of the shaft-like parts to achieve axial positioning and clamping. The system only drives the shaft-like parts to rotate in the circumferential direction, ensuring high rigidity in this direction and preserving the positioning accuracy of the two centers. The system clamps the parts by filling the annular sealing cavity 231 with pressurized fluid and releases the shaft-like parts by depressurizing the cavity. It is easy to control and suitable for rapid automated loading and unloading.

[0031] The tip 21 can be fixedly assembled with the rotating spindle 1 to achieve synchronous rotation. Alternatively, the tip 21 can maintain relative rotation with the rotating spindle 1, with the tip 21 remaining stationary while the rotating spindle 1 rotates.

[0032] The clamping member 22 and the force-applying member 23 are fixedly assembled to the rotating spindle 1, which can be either direct assembly or indirect assembly, or one can be directly assembled and the other indirectly assembled.

[0033] like Figure 3As shown, the rotary joint component 24 is rotatably mounted on the force-applying component 23. While the clamping component 22 and the force-applying component 23 rotate together with the rotating spindle, the rotary joint component 24 remains fixed, facilitating the connection of the pipe interface 241 to an external pipe interface providing pressurized fluid. In other embodiments, the rotary joint component 24 may be rotatably mounted on the clamping component 22 or simultaneously rotatably mounted on both the force-applying component 23 and the clamping component 22. Further, the rotary joint component 24 is coaxially rotatably mounted on the clamping component 22 and / or the force-applying component 23 via a support component 25 to achieve relative rotation with respect to the clamping component 22 and the force-applying component 23. The support component 25 includes, but is not limited to, rolling elements, rolling bearings, and sliding bearings. To achieve a seal and prevent pressurized fluid leakage, a sealing ring is placed between the rotary joint component 24 and the force-applying component 23 and the clamping component 22.

[0034] like Figure 3 As shown, the force-applying component 23 includes a frame 232, the inner surface of which has an inner annular groove. An annular elastomer 233 is fitted into the inner annular groove to be fixedly assembled with the frame 232, thereby positioning the elastomer radially inside the frame 232. An annular sealing cavity 231 is defined between the frame 232 and the elastomer 233. This ensures the sealing performance of the annular sealing cavity 231.

[0035] like Figure 3 , Figure 5 As shown, the pipe interface 241 of the rotary joint component 24 is connected to the sealing cavity 231 through a channel on the clamping component 22 and / or the force-applying component 23. The channel on the clamping component 22 and / or the force-applying component 23 allows the channel to rotate with the clamping component 22 and / or the force-applying component 23, ensuring the rotational balance of the clamp assembly 2 and preventing the additional pipe interface from becoming entangled or twisted. Specifically, the rotary joint component 24 is coaxially fitted onto the radial outer surface of the frame 232. The rotary joint component 24 forms an annular groove 243 connecting the pipe interface 241. The frame 232 has several through holes 2321, and the annular sealing cavity 231 communicates with the annular groove 243 through the through holes 2321. In other embodiments, the annular groove 243 can be provided on the frame 232, on the rotary joint component 24, or simultaneously on both the rotary joint component 24 and the frame 232. This ensures smooth communication between the pipe interface 241 of the rotary joint component 24 and the annular sealing cavity. In particular, the annular sealing cavity 231 can be quickly filled with pressurized fluid and depressurized using only one pipe interface 241.

[0036] In the illustrated structure, the clamping member 22 includes a flange 222 fixedly mounted to the rotating spindle 1, and a clamping part 221 extending axially from the flange 222. Accordingly, while ensuring strength, the clamping part 221 can maintain a large deformation capacity without affecting the double-center positioning accuracy of the part. Specifically, the clamping part 221 is as follows... Figure 7 The deformable sleeve 2211 shown or as Figure 6 The image shows several arc-shaped lobes 2212 distributed along the circumference.

[0037] In the illustrated structure, the rotary joint component 24 is provided with an exhaust port 242 that connects to the annular sealing cavity. When pressurized fluid is filled into the annular sealing cavity 231, the air in the annular sealing cavity 231 can be discharged through the exhaust port. After the air is discharged, the channel is closed. This is especially suitable for situations where the pressurized fluid is a high-pressure liquid. Since air is compressible, by discharging the air, insufficient clamping force caused by air in the pressurized fluid can be avoided.

Claims

1. A clamping system that drives shaft-like parts to rotate about an axis, characterized in that: include: Rotating spindle (1); The clamp assembly (2), which is coaxially mounted at the end of the rotating spindle (1), includes a clamping member (22), a force-applying member (23), and a rotary joint member (24) that are radially mounted. The clamping member (22) and the force-applying member (23) are fixedly mounted on the rotating spindle (1) to rotate together with the rotating spindle (1). The clamping member (22) has a clamping part (221) for clamping parts. The force-applying member (23) has an annular sealing cavity (231) and an elastic body (233) that serves as the inner wall of the annular sealing cavity (231). The elastic body (233) is fitted on the radial outer surface of the clamping part (221). The rotary joint member (24) is rotatably configured relative to the clamping member (22) and the force-applying member (23) and is provided with a pipe interface (241) for inputting pressurized fluid into the annular sealing cavity (231). The tip (21) is located radially inside the rotating spindle (1) and extends toward the clamping part (221).

2. The clamping system according to claim 1, characterized in that: The rotary joint component (24) is rotatably assembled to the clamping component (22) and / or the force-applying component (23).

3. The clamping system according to claim 1, characterized in that: The pipe interface (241) of the rotary joint component (24) is connected to the sealing cavity (231) through a channel on the clamping component (22) and / or the force-applying component (23).

4. The clamping system according to claim 1, characterized in that: The force-applying component (23) includes a skeleton (232), an elastomer (233) is fixedly assembled with the skeleton (232) and located on the radial inner side of the skeleton (232), and an annular sealing cavity (231) is defined between the skeleton (232) and the elastomer (233).

5. The clamping system according to claim 4, characterized in that: The rotary joint component (24) is coaxially fitted on the radial outer surface of the skeleton (232). The rotary joint component (24) and / or the skeleton (232) form an annular groove (243) for the connecting pipe interface (241). The skeleton (232) is provided with several through holes (2321). The annular sealing cavity (231) is connected to the annular groove (243) through the through holes (2321).

6. The clamping system according to claim 1, characterized in that: The clamping member (22) includes a flange (222) fixedly mounted to the rotating spindle (1), and a clamping part (221) extending axially from the flange (222).

7. The clamping system according to claim 6, characterized in that: The clamping part (221) is a deformable sleeve (2211) or a number of arc-shaped lobes (2212) distributed along the circumference.

8. The clamping system according to claim 1, characterized in that: The pressure fluid is a high-pressure liquid or gas.

9. The clamping system according to claim 1, characterized in that: The rotary joint component (24) is coaxially rotatably mounted on the clamping component (22) and / or the force-applying component (23) via the support component (25) to achieve relative rotation of the clamping component (22) and the force-applying component (23).

10. The clamping system according to claim 9, characterized in that: The rotary joint component (24) is provided with an exhaust port that connects to the annular sealing cavity.

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