Tooling fixture with rotation function

Abstract

The application discloses a tool clamp with rotating function, which comprises a base and a rotary table positioned at the rotary center, the rotary table can rotate along the rotary center on the base, a clamping device for fixing workpieces is arranged on the rotary table, an elastic supporting device for driving the rotary table to lift is arranged between the base and the rotary table, the elastic supporting device comprises a rolling part for providing rolling friction for the rotary table rotation, a locking device for pressing the rotary table on the base and driving the rolling part to retract into the elastic supporting device is arranged between the rotary table and the base; the tool clamp adopting the technical scheme can provide support and rolling friction for the rotary table through the elastic supporting device arranged between the rotary table and the base when the rotary table rotates, and when the rotary table is locked, the elastic supporting device is compressed to make the rotary table and the base in plane contact, so that the locking of the rotary table is reliable and the flatness can be ensured.

Description

Technical Field

[0001] This invention relates to tooling fixtures. Background Technology

[0002] Tooling fixtures provide clamping for parts in machining to facilitate equipment processing. Some parts require machining multiple surfaces during general-purpose machine processing. When using traditional tooling fixtures, it is necessary to continuously clamp the workpiece to adjust its position so that the surface to be machined is in the machining position. However, secondary clamping of the workpiece is not only prone to errors, but also time-consuming and labor-intensive. Therefore, tooling fixtures with rotation functions are designed for workpieces that require machining on multiple surfaces. The position of the surface to be machined on the workpiece is adjusted by rotating the turntable. The frictional contact between the traditional turntable and the base results in high resistance during rotation and inconvenient operation. Therefore, it is necessary to improve the rotation smoothness of the turntable. For example, a multi-station milling rotary fixture disclosed in patent 201620519683.6 includes a fixed base and a rotary table. The rotary table is set on the fixed base by bearings and rotating pins. Although the rotation resistance of the rotary table is reduced, the bottom surface of the rotary table does not contact the top surface of the fixed base, making the turntable locking unstable and difficult to level. Summary of the Invention

[0003] To address the problems of high rotational resistance and unstable locking between the turntable and base in existing technologies, the technical solution adopted in this invention is as follows:

[0004] A tooling fixture with a rotation function includes a base and a turntable with a rotation center positioned thereon. The turntable is rotatable on the base along the rotation center. A clamping device for fixing a workpiece is provided on the turntable. An elastic support device for lifting the turntable is provided between the base and the turntable. The elastic support device includes rolling elements that provide rolling friction for the rotation of the turntable. A locking device for pressing the turntable against the base and driving the rolling elements back into the elastic support device is provided between the turntable and the base.

[0005] Furthermore, a positioning structure for positioning the rotation angle of the turntable is provided between the turntable and the base; the positioning structure is a pin hole and pin or a keyway and key.

[0006] Furthermore, the elastic support device is mounted on a turntable or base, and the turntable or base is provided with a mounting groove for the elastic support device to be embedded in.

[0007] Furthermore, the elastic support device includes an elastic element, and the rolling element is a planar bearing with the axis of the planar bearing coaxial with the rotation center of the turntable.

[0008] Furthermore, a set of elastic support devices is arranged circumferentially along the rotation center. The elastic support device includes a mounting sleeve, a movable sleeve for mounting rolling elements is floatingly disposed within the mounting sleeve, an elastic element for driving the movable sleeve to extend out of the movable sleeve is provided within the mounting sleeve, an adjusting element for adjusting the compression amount of the elastic element is provided on the mounting sleeve, and a limiting element for limiting the extension length of the movable sleeve is provided on the mounting sleeve.

[0009] Furthermore, the locking device consists of a shaft and a pressure block located at the center of the turntable.

[0010] Furthermore, the locking device includes a set of pull rods, each pull rod having a pressure block arranged circumferentially on the base, and each pull rod having a nut threadedly connected to drive the pressure block to retract, and each pull rod having a linkage hinged to it; each pressure block has a clamping part at both ends, and the turntable and the base have clamping grooves that cooperate with the clamping parts, at least one of the clamping parts being wedge-shaped and the clamping groove that cooperates with the wedge-shaped clamping part having an inclined surface.

[0011] The tooling fixture using this technical solution has an elastic support device between the turntable and the base. When the turntable rotates, the elastic support device provides support and rolling friction to the turntable. When the turntable is locked, the elastic support device is compressed so that the planes of the turntable and the base come into contact, ensuring that the turntable is locked reliably and that the flatness is guaranteed. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention;

[0013] Figure 2 for Figure 1 Sectional view;

[0014] Figure 3 This is a schematic diagram of the structure of the elastic support device of Embodiment 1 and the turntable rotation center positioning structure of Embodiment 1 of the present invention;

[0015] Figure 4 This is a schematic diagram of the structure of the elastic support device of Embodiment 2 and the turntable rotation center positioning structure of Embodiment 2 of the present invention;

[0016] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the elastic support device of the present invention, wherein (a) is an exploded view and (b) is a sectional view;

[0017] Figure 6 This is a schematic diagram of the overall structure of the locking device of the present invention;

[0018] Figure 7 for Figure 6 Partial sectional view of the locking device. Detailed Implementation

[0019] To better understand the concept of this invention, the technical solution of this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 The tooling fixture shown includes a base 1, a turntable 2 on the base 1, and a clamping device 3 on the turntable 2. The clamping device 3 is used to clamp workpiece A onto the turntable 2. When the turntable 2 rotates, it drives the workpiece to rotate synchronously.

[0021] like Figure 2 The clamping device 3 shown includes a fixed shaft 3-1 mounted on a turntable 2. One end of the fixed shaft 3-1 extends out of the upper surface of the turntable 2. A pressure plate 3-2 is provided at the part of the fixed shaft 3-1 that extends out of the upper surface of the turntable 2. The pressure plate 3-2 can press and fix the workpiece onto the turntable 2 by means of a nut 3-3. Of course, the attached figure only shows one embodiment. Pneumatic chucks or other clamping devices can also be provided on the turntable 2 as clamping devices to fix and clamp parts.

[0022] To prevent the rotation center of turntable 2 from changing, such as Figure 2 and 4 As shown, a positioning shaft 7 is provided on the base 1. The positioning shaft 7 passes through the turntable 2, allowing the turntable to rotate around the positioning shaft 7. In this embodiment, the positioning shaft 7 is fixedly connected to the turntable 2, allowing the positioning shaft 7 to rotate within the base 1. To prevent wear, a bushing 7-1 is provided between the positioning shaft 7 and the base 1. In this structure, the positioning shaft 7 and the fixed shaft 3-1 can be considered as a single unit. Alternatively, the positioning shaft 7 can be fixed to the base 1, allowing the turntable 2 to rotate around the positioning shaft 7. To prevent displacement between the fixed shaft 3-1 (for clamping the workpiece) and the workpiece, or to prevent the workpiece from being released during turntable rotation, the fixed shaft 3-1 is not integrated with the positioning shaft 7 and is instead located within the turntable 2. Besides... Figure 2 and Figure 4 In addition to the method of positioning the rotary table rotation center via positioning axis 7 given in the text, such as Figure 3 As shown, a protruding ridge 8 can also be set on the edge of the base 1 to constrain the turntable 2 in the circumferential direction, thereby positioning the rotation center of the turntable.

[0023] To minimize resistance and ensure smoother rotation of the turntable 2, an elastic support device 4 is installed between the turntable 2 and the base 1. This elastic support device 4 can be mounted on either the turntable 2 or the base 1. When the turntable 2 is rotating, the elastic support device 4 provides support, preventing the bottom surface of the turntable 2 from contacting the top surface of the base 1, thus reducing friction. Furthermore, the elastic support device 4 provides rolling friction for the turntable 2, resulting in even less resistance and smoother rotation. A locking device 5 is also installed between the base 1 and the turntable 2. This locking device 5 applies pressure to the turntable 2, compressing the elastic support device 4 back into the base 1 or the turntable 2, eliminating the gap between them. This forces the bottom surface of the turntable 2 to press tightly against the top surface of the base 1, locking the turntable 2 onto the base 1 and preventing it from rotating under external forces. On one hand, the bottom surface of the turntable 2 and the top surface of the base 1 provide significant friction; on the other hand, the top surface of the base 1 provides planar support for the turntable 2, ensuring its flatness.

[0024] The elastic support device 4 includes a rolling element 4-1 that provides rolling friction for the rotation of the turntable 2, such as... Figure 3 In the embodiment shown, the rolling element 4-1 is a planar bearing. An mounting groove 9 is provided on the base 1, and an elastic element 4-2 is provided in the mounting groove 9. In this embodiment, the elastic element 4-2 is a spring plate. After assembly, the planar bearing and the spring plate are embedded in the mounting groove 9. The planar bearing is driven to disengage from the mounting groove 9 by the action of the spring plate, thereby driving the turntable 2 to lift up and disengage the bottom surface of the turntable 2 from the top surface of the base 1, so that the turntable 2 rotates on the planar bearing. The rolling friction provided by the planar bearing reduces the rotational resistance of the turntable. It should also be noted that the center of the planar bearing must be kept coincident with the rotation center of the turntable 2.

[0025] Or like Figure 4 and Figure 5A set of elastic support devices 4 are arranged around the rotation center of the turntable. Each elastic support device 4 includes a mounting sleeve 4-3, a movable sleeve 4-4 and an elastic element 4-2 are arranged inside the mounting sleeve 4-3. The bottom of the movable sleeve 4-4 tends to detach from the mounting sleeve due to the force of the elastic element 4-2. A rolling element 4-1 is mounted on the mounting sleeve 4-3. To prevent the movable sleeve 4-4 from detaching from the mounting sleeve 4-3 and to limit its height extending out of the mounting sleeve 4-3, a limiting element 4-6 is provided on the mounting sleeve 4-3, and a limiting groove 4-61 is provided on the movable sleeve 4-4. The limiting element 4-6 is engaged with the limiting groove 4-61 to limit the movable sleeve 4-4. To improve the elastic force of the elastic element 4-2, an adjusting element 4-5, which is a nut, is provided at the bottom of the mounting sleeve 4-3. Tightening the nut adjusts the compression of the elastic element 4-2, thereby improving its elastic force. When the turntable 2 or the installed parts are heavy, they counteract the elastic force of the elastic element 4-2, requiring an increase in its elastic force to lift the turntable 2. This adjustment is achieved by using the adjusting element 4-5 to adjust the compression of the elastic element 4-2 and improve its elastic force. In this embodiment, the rolling element 4-1 is a bearing, but ball bearings can also be used.

[0026] To facilitate the control of the rotation angle of the turntable 2, a positioning structure 6 is provided between the turntable 2 and the base 1. Figure 1 The positioning structure 6 shown consists of a keyway and a key. The base 1 has one keyway, and the turntable 2 has a set of keyways arranged circumferentially. When the turntable 2 needs to rotate through a certain angle, the corresponding keyway on the turntable 2 aligns with the corresponding keyway on the base, and the key is engaged to lock the keyway for positioning. This positioning structure 6, in conjunction with the locking device 5, further locks the turntable 2 to prevent rotation of the turntable 2 during machining. Besides the embodiment shown in the figure, a pin and pin hole can also be used to achieve the positioning and locking of the turntable.

[0027] In order to lock the turntable 2 onto the base 1, a locking device 5 is provided between the base 1 and the turntable 2, such as... Figure 1 , 2The locking device shown in Figures 6 and 7 includes a set of pull rods 5-1. The pull rods 5-1 are placed inside the base 1, with one end extending beyond the side of the base 1. The ends of the pull rods 5-1 inside the base 1 are hinged together by a linkage 5-4. In this embodiment, the linkage 5-4 is a ring, and the end of the pull rod 5-1 inside the base 1 is hinged to this ring. When one pull rod 5-1 moves axially, it can drive the other pull rods 5-1 to move axially as well through the linkage 5-4. Of course, the linkage 5-4 can also be a connecting rod or a flexible rope, etc. A pressure block 5-2 is provided at the end of the pull rod 5-1 extending out of the base 1, and a nut 5-3 is threadedly connected to it. When the nut 5-3 is tightened, it will cause the pressure block 5-2 to move. The pull rod 5-1 moves axially towards the base 1 and the turntable 2. Therefore, when one of the nuts 5-3 is tightened, the linkage 5-4 can drive the other pull rods 5-1 to move the pressure blocks 5-2 on each pull rod 5-1 closer to the base 1 and the turntable 2, thereby achieving a quick locking effect. The turntable 2 and the base 1 are respectively provided with a locking groove 5-6. At both ends of each pressure block 5-2, there is a locking part 5-5 located in the locking groove 5-6. The locking part 5-5 is wedge-shaped and the locking groove 5-6 is provided with a slope that cooperates with it. When the pressure block 5-2 moves closer to the base 1, the wedge-shaped structure of the locking part 5-5 squeezes the slope of the locking groove 5-6, thereby pressing the turntable 2 onto the base 1 to achieve locking. In this embodiment, the clamping parts 5-5 are all wedge-shaped and the clamping grooves 5-6 are all inclined. Theoretically, one of the clamping parts 5-5 in each pressing block 5-2 only needs to be wedge-shaped and the clamping groove 5-6 that matches it needs to be inclined. For example, the clamping part 5-5 on one side of the turntable 2 is wedge-shaped and the clamping groove 5-6 on the turntable has an inclined surface, which can achieve the purpose of pressing the turntable 2 onto the base 1. Of course, in addition to the locking device 5 shown in the figure, a shaft and a pressing block passing through the rotation center of the turntable can also be used to lock the turntable 2 and the base 1. That is, a shaft is fixed on the base (1), the turntable is sleeved on the shaft and the shaft is used as the rotation center. A pressing block and a nut are set on the top of the shaft and the turntable 2 is locked to the base 1 by locking the nut.

Claims

1. A tooling fixture with a rotation function, comprising a base (1) and a turntable (2) with a rotation center positioned thereon, the turntable (2) being rotatable on the base (1) along the rotation center, and a clamping device (3) for fixing workpieces being provided on the turntable (2), characterized in that: An elastic support device (4) is provided between the base (1) and the turntable (2) to drive the turntable (2) to rise. The elastic support device (4) includes a rolling element (4-1) that provides rolling friction for the rotation of the turntable (2). A locking device (5) is provided between the turntable (2) and the base (1) to press the turntable (2) onto the base (1) and drive the rolling element (4-1) to retract into the elastic support device (4). After the elastic support device (4) is compressed, the bottom surface of the turntable (2) is pressed tightly against the top surface of the base (1). The elastic support device (4) is mounted on the turntable (2) or the base (1), and the turntable (2) or the base (1) is provided with a mounting groove (9) for the elastic support device (4) to be embedded in; the elastic support device (4) includes an elastic element (4-2), and the rolling element (4-1) is a plane bearing with its axis coaxial with the rotation center of the turntable; a set of elastic support devices (4) is arranged circumferentially along the rotation center, and the elastic support device (4) includes a mounting sleeve ( 4-3) A movable sleeve (4-4) for mounting the rolling element (4-1) is floatingly disposed inside the mounting sleeve (4-3). An elastic element (4-2) is provided inside the mounting sleeve (4-3) to drive the movable sleeve (4-4) to extend out of the movable sleeve (4-4). An adjusting element (4-5) for adjusting the compression of the elastic element (4-2) is provided on the mounting sleeve (4-3). A limiting element (4-6) for limiting the extension length of the movable sleeve (4-4) is provided on the mounting sleeve (4-3).

2. A tooling fixture with a rotation function according to claim 1, characterized in that: A positioning structure for positioning the rotation angle of the turntable (2) is also provided between the turntable (2) and the base (1); the positioning structure (6) is a pin hole and pin or a keyway and key.

3. A tooling fixture with a rotation function according to claim 1, characterized in that: The locking device (5) is a shaft, a pressure block, and a nut set at the center of the turntable (2). The turntable is sleeved on the shaft and uses the shaft as the rotation center. The pressure block and nut are set at the top of the shaft. The turntable (2) is locked to the base (1) by locking the nut.

4. A tooling fixture with a rotation function according to claim 1, characterized in that: The locking device (5) includes a set of pull rods (5-1), each of the pull rods (5-1) is provided with a pressure block (5-2) arranged in the circumferential direction of the base (1), each of the pull rods (5-1) is threaded with a nut (5-3) for driving the pressure block (5-2) to retract, and each of the pull rods (5-1) is hinged with a linkage (5-4); both ends of the pressure block (5-2) are provided with a clamping part (5-5), and both the turntable (2) and the base (1) are provided with a clamping groove (5-6) that cooperates with the clamping part (5-5), at least one of the clamping parts (5-5) is wedge-shaped and the clamping groove (5-6) that cooperates with the wedge-shaped clamping part (5-5) has an inclined surface.

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