Suspension drive self-centering fixture

Abstract

The application discloses a suspension type driving automatic centering clamp, which comprises a base, a reference seat and at least one set of synchronous centering clamping mechanism, each set of synchronous centering clamping mechanism comprises two symmetrically arranged clamping jaws, a wedge-shaped core block and a clamping driving mechanism, the wedge-shaped core block is connected with the two clamping jaws through oblique sliding fit structure, and the clamping driving mechanism is arranged on the reference seat through transverse sliding structure. Workpiece reference positioning clamping blocks are arranged at both ends of the reference seat, and the clamping blocks are arranged between the clamping jaws or between adjacent clamping jaws to form clamping stations. Point contact, line contact or discontinuous sliding surface formed by discontinuous surface between the clamping jaws and the face plate and the wedge-shaped core block and the clamping jaws is adopted to reduce friction. A follow-up sealing assembly is arranged on the face plate and is composed of a fixed sealing plate and a movable sealing plate. The face plate is a steel plate, and the reference seat is an aluminum alloy plate. The application can simultaneously clamp multiple stations, automatically adapt to follow-up centering, adapt to workpieces of different sizes, follow up sealing, and balance rigidity, light weight and vibration resistance.

Description

Technical Field

[0001] This invention relates to clamps, and more specifically to a suspended drive automatic centering clamp. Background Technology

[0002] A fixture is a process device used during machining to quickly secure a workpiece, maintaining the correct relative position of the machine tool, cutting tool, and workpiece. When machining a workpiece on a machine tool, to ensure that the workpiece surface meets the technical requirements specified in the drawing, such as dimensions, geometry, and positional accuracy relative to its surface, the workpiece must be positioned and clamped before machining. In other words, tooling fixtures are indispensable components of machining. Driven by the development of machine tool technology towards high speed, high efficiency, precision, composite, intelligent, and environmentally friendly directions, fixture technology is developing towards high precision, high efficiency, modularity, versatility, and economy.

[0003] For example, the utility model patent disclosed in CN222134131U discloses a hydraulic matrix universal clamping fixture, including a base, a pull-down jaw assembly, a fixed jaw assembly, and a hydraulic cylinder. The pull-down jaw assembly is disposed on the base and includes a translation block and a pull-down block. The fixed jaw assembly is disposed on the base and cooperates with the translation block to clamp and lock the workpiece. The hydraulic cylinder is disposed on the base and drives the pull-down block to move up and down. There are at least two pull-down jaw assemblies arranged side by side with intervals. By setting at least two pull-down jaw assemblies for each hydraulic cylinder, and cooperating with each hydraulic cylinder to drive the pull-down blocks of at least two pull-down jaw assemblies to move up and down simultaneously through a lever mechanism, multiple workpieces can be clamped at the same time, effectively improving clamping efficiency. It can also greatly reduce the number of hydraulic cylinders, making the internal structure of the fixture more spacious and simple, while also saving overall manufacturing costs and enhancing product competitiveness.

[0004] However, the above-mentioned general-purpose fixtures still have the following shortcomings:

[0005] The hydraulic cylinders of the aforementioned general-purpose fixtures are fixedly mounted on the base and cannot move laterally, resulting in a relatively fixed clamping position that is difficult to flexibly adapt to workpieces of different sizes or processing positions. Especially when multiple workpieces need to be clamped simultaneously for multi-station processing, the fixed clamping unit cannot adjust the clamping position according to the actual distribution of the workpieces, thus resulting in poor adaptability and inconvenient adjustment. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned problems and provide a suspended drive automatic centering fixture. This fixture can not only clamp multiple workpieces, but also adapt to workpieces of different sizes, adaptively complete positioning, and has better adaptability and higher accuracy.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A suspended drive automatic centering fixture includes a base and a reference seat and a synchronous centering clamping mechanism disposed on the base.

[0009] The synchronous centering clamping mechanism is provided in at least one set. Each set of synchronous centering clamping mechanisms includes a jaw, a wedge-shaped expansion block, and a clamping drive mechanism for driving the wedge-shaped expansion block to move and for lateral adjustment relative to the reference seat in the clamping adjustment state. There is at least one jaw in the same set. The wedge-shaped expansion blocks are respectively connected to the jaws through an oblique sliding fit structure. The drive end of the clamping drive mechanism is directly or indirectly fixedly connected to the wedge-shaped expansion block. The clamping drive mechanism is movably mounted on the reference seat.

[0010] The reference base is provided with at least one workpiece reference positioning clamping block. The space between the workpiece reference positioning clamping block and the jaws of the adjacent synchronous centering clamping mechanism or the space between the jaws of two adjacent synchronous centering clamping mechanisms constitutes a clamping station.

[0011] In a preferred embodiment of the present invention, the same group of grippers has two grippers symmetrically arranged on both sides of the wedge-shaped expansion block; both ends of the reference base are provided with workpiece reference positioning clamping blocks, and the grippers are located between the two workpiece reference positioning clamping blocks.

[0012] The bottom of the gripper is provided with one or more integrally formed convex tails, and the reference base is provided with convex tail guide grooves that mate with the convex tails. When clamping the workpiece, the oblique sliding mating surface between the wedge-shaped expansion block and the gripper bears the clamping lateral force and the overturning torque, while the convex tails and the convex tail guide grooves play a role in lateral guidance and auxiliary limiting. The convex tails and the convex tail guide grooves are in contact through discontinuous sliding surfaces. In this way, the convex tails can resist the overturning torque generated by the clamping operation, reduce the wear of the convex tail parts, reduce the cumulative assembly error, and improve clamping accuracy and working stability.

[0013] In a preferred embodiment of the present invention, the bottom of the gripper is provided with one or more split convex tails, which are fixed to the bottom of the gripper by a fixed connection structure (e.g., screws).

[0014] In a preferred embodiment of the present invention, the lateral sliding structure includes an adaptive lateral movement hole, a lateral sliding groove, and a lateral sliding block. Both the adaptive lateral movement hole and the lateral sliding groove are formed on the reference base. The lateral sliding block cooperates with the lateral sliding groove. The clamping drive mechanism is fixedly mounted on the lateral sliding block, and its drive end passes through the lateral sliding groove and the adaptive lateral movement hole and is fixedly connected to the wedge-shaped expansion block. This structure enables the clamping drive mechanism to perform smooth and precise lateral adjustment and movement on the reference base, without interference between the drive end and the reference base during movement. This ensures smooth adjustment of the clamping position size and accurate positioning, thereby effectively enhancing the fixture's adaptability to workpieces of different sizes.

[0015] In a preferred embodiment of the present invention, the clamping drive mechanism includes a cylinder drive mechanism, a hydraulic drive mechanism, a manual drive mechanism, or a motor drive mechanism. This diverse selection of drive methods allows users to flexibly configure the clamping mechanism according to actual usage scenarios, cost budgets, and on-site power conditions: pneumatic methods offer fast response and are clean and environmentally friendly; hydraulic methods provide high clamping force and are stable and reliable; manual methods have a simple structure, require no external power source, and are suitable for small-batch or temporary processing, thereby significantly improving the applicability and economy of the clamp.

[0016] In a preferred embodiment of the present invention, the surface of the reference base is provided with a clamping guide groove and a panel, the panel limiting the convex tail of the gripper within the clamping guide groove. In this way, the gripper is always constrained by the guide groove during movement, ensuring that the gripper moves in a straight line and avoiding problems such as insecure clamping or inaccurate positioning due to skewness.

[0017] Furthermore, the oblique sliding fit structure is a dovetail groove or a T-groove; the gripper contacts the surface of the panel through a discontinuous sliding surface; the wedge-shaped expansion block contacts the surface of the gripper through a discontinuous sliding surface. With this structure, compared to the traditional method of sliding through a full surface contact, the discontinuous sliding surface reduces sliding friction, resulting in minimal resistance when the gripper contracts and clamps, faster response, and greater clamping force. This allows for a greater effective clamping force under the same driving force, while also reducing wear on the sliding surface and extending the service life of the fixture.

[0018] Furthermore, the discontinuous sliding surface is composed of point contact, line contact, or discontinuous surface.

[0019] Furthermore, the panel is provided with guide clearance holes, and both side walls of the guide clearance holes are provided with sealing mounting grooves. A follow-up sealing assembly is provided at the top of the guide clearance holes. At least one set of follow-up sealing assemblies is provided, each set including a fixed sealing plate and a movable sealing plate. Two fixed sealing plates are provided in the same set, covering both ends of the clamping guide groove. The side walls of the same fixed sealing plate extend into the sealing mounting grooves of the two panels respectively. Two movable sealing plates are provided in the same set, both covering the clamping guide groove. One side wall of the movable sealing plate extends into the sealing mounting groove of one of the panels, and the other side wall of the movable sealing plate is provided with a mounting clearance groove for avoiding the gripper. The two movable sealing plates are symmetrically arranged on both sides of the gripper. One end of the movable sealing plate overlaps one end of one of the fixed sealing plates, and the other end of the movable sealing plate overlaps one end of the other fixed sealing plate. With this structure, on the one hand, impurities such as iron filings can be prevented from entering the interior from the clamping guide groove, protecting the internal structure from being affected by impurities. On the other hand, a relatively flat surface is created, facilitating cleaning and reducing cleaning time.

[0020] Furthermore, one end of the guide clearance hole is an open structure, and the other end is a closed structure. This design facilitates the insertion or removal of components such as wedge-shaped expansion blocks and grippers from the open end during assembly and maintenance, reducing assembly difficulty. It also provides necessary clearance space for the movement of the drive end, while the closed end restricts the extreme positions of the moving parts, playing a limiting and protective role.

[0021] Furthermore, the panel and the reference base are a composite assembly structure, with the panel being a steel plate and the reference base being an aluminum alloy plate. The advantage of this design is that the steel plate has high hardness and wear resistance, capable of withstanding the wear caused by frequent sliding of the grippers, ensuring long-term accuracy; the aluminum alloy plate is lightweight and easy to process, reducing the overall weight and manufacturing cost of the fixture. This composite assembly leverages the advantages of each material while facilitating separate processing and replacement, improving the fixture's overall performance and economy.

[0022] Furthermore, the reference base is an integrated structure. It has good overall rigidity, avoiding assembly errors and relative looseness that may occur with split structures. This helps ensure positional accuracy between each clamping station, simplifies the assembly process, and improves the overall stability of the fixture.

[0023] Furthermore, the movable sealing plate is not limited to one embodiment. The movable sealing plate is an integral structure and is located in front of or behind the moving direction of the gripper, and is connected to the bottom of the gripper for sealing the guide groove.

[0024] In a preferred embodiment of the present invention, an adjustable support structure is provided below the reference base. This adjustable support structure includes an upper support plate, a lower support plate, and a double-ended screw. The double-ended screw is threaded between the upper and lower support plates, and the upper support plate rests on the bottom surface of the reference base. By rotating the double-ended screw, the distance between the upper and lower support plates can be precisely adjusted, thereby changing the support height of the reference base. This structure can compensate for the unevenness of the machine tool worktable, ensuring that the reference base is in a horizontal and stable state, thus guaranteeing the reference accuracy of workpiece clamping. Simultaneously, when it is necessary to change workpieces of different thicknesses or adjust the overall height of the fixture, adjustments can be quickly made, enhancing the adaptability of the fixture to different machine tools and processing conditions.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. By setting at least one set of synchronous centering clamping mechanism and combining it with workpiece reference positioning clamping block, multiple clamping stations can be formed (between workpiece reference positioning clamping block and jaws, or between two adjacent sets of jaws), so as to realize the simultaneous clamping of multiple workpieces and significantly improve batch processing efficiency.

[0027] 2. By using a wedge-shaped expansion block to drive the symmetrical jaws on both sides through an oblique sliding fit structure, the two jaws move synchronously and symmetrically, thereby automatically positioning the workpiece center, ensuring the consistency of the workpiece clamping position, and improving machining accuracy.

[0028] 3. The clamping drive mechanism of the present invention moves laterally relative to the reference seat in the clamping adjustment state, thereby changing the distance between the clamping jaw and the workpiece reference positioning clamping block or adjacent clamping jaw, that is, adjusting the size of the clamping station, which can flexibly adapt to workpieces of different sizes and enhance the versatility of the fixture.

[0029] 4. The moving drive of the wedge-shaped expansion block of the present invention allows the jaws on both sides to open and close synchronously. Without the need to adjust each jaw separately, it can automatically adapt to the actual size of the workpiece to complete centering and clamping, reducing the number of manual centering and adjustment steps. Attached Figure Description

[0030] Figure 1-2 These are three-dimensional structural diagrams of the suspended drive automatic centering fixture of the present invention from two different perspectives.

[0031] Figure 3 This is an exploded three-dimensional structural diagram of the suspended drive automatic centering fixture of the present invention.

[0032] Figure 4 This is a cross-sectional view of the suspended drive automatic centering fixture of the present invention.

[0033] Figure 5This is an exploded three-dimensional structural diagram of the gripper and wedge-shaped expansion block of the present invention.

[0034] Figure 6 This is a three-dimensional structural diagram of the gripper, wedge-shaped expansion block, panel, and follow-up sealing assembly of the present invention.

[0035] Figure 7 This is an exploded three-dimensional structural diagram of the gripper, wedge-shaped expansion block, panel, and follow-up sealing assembly of the present invention.

[0036] Figure 8-9 This is an exploded three-dimensional structural diagram of the reference base and panel of the present invention from two different perspectives. Detailed Implementation

[0037] To enable those skilled in the art to fully understand the technical solutions of the present invention, the present invention will be further described below in conjunction with embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0038] Combination Figure 1-9 The suspended drive automatic centering fixture of this embodiment includes a base 1 and a reference seat 2 disposed on the base 1, and a synchronous centering clamping mechanism; the synchronous centering clamping mechanism is provided in at least one set, and each set of synchronous centering clamping mechanisms includes a jaw 3, a wedge-shaped expansion block 4, and a clamping drive mechanism for driving the wedge-shaped expansion block 4 to move. Two jaws 3 are provided in the same set and symmetrically disposed on both sides of the wedge-shaped expansion block 4 (or one). The wedge-shaped expansion block 4 is connected to the two jaws 3 respectively through a dovetail groove or a T-groove; the clamping drive mechanism... The moving end is directly or indirectly fixedly connected to the wedge-shaped expansion block 4. The clamping drive mechanism is suspended on the reference base 2 through a transverse sliding structure. The clamping drive mechanism moves laterally relative to the reference base 2 in the clamping adjustment state. Both ends of the reference base 2 are provided with workpiece reference positioning clamping blocks 5. The jaws 3 are located between the two workpiece reference positioning clamping blocks 5. The space between the workpiece reference positioning clamping block 5 and the jaws 3 of the adjacent synchronous centering clamping mechanism or the space between the jaws 3 of two adjacent synchronous centering clamping mechanisms constitutes the clamping station.

[0039] Furthermore, the bottom of the gripper 3 is provided with an integrally formed convex tail 3-1, and the reference base 2 is provided with a convex tail guide groove that mates with the convex tail 3-1. When clamping the workpiece, the oblique sliding mating surface between the wedge-shaped expansion block 4 and the gripper 3 bears the clamping lateral force and the overturning torque, while the convex tail 3-1 and the convex tail guide groove play a role in lateral guidance and auxiliary limiting. The convex tail 3-1 and the convex tail guide groove are in contact through a discontinuous sliding surface. In this way, the convex tail 3-1 can resist the overturning torque generated by the clamping operation, reduce the wear of the convex tail, reduce the cumulative assembly error, and improve the clamping accuracy and working stability.

[0040] Combination Figure 1-9 The lateral sliding structure includes an adaptive lateral movement hole 2-1, a lateral sliding groove 2-2, and a lateral sliding block 6. Both the adaptive lateral movement hole 2-1 and the lateral sliding groove 2-2 are formed on the reference base 2. The lateral sliding block 6 cooperates with the lateral sliding groove 2-2. The clamping drive mechanism is fixedly mounted on the lateral sliding block 6. The drive end of the clamping drive mechanism passes through the lateral sliding groove 2-2 and the adaptive lateral movement hole 2-1 and is fixedly connected to the wedge-shaped expansion block 4. This structure allows the clamping drive mechanism to perform smooth and precise lateral adjustment and movement on the reference base 2, without interference between the drive end and the reference base 2 during movement. This ensures smooth adjustment of the clamping position size and accurate positioning, effectively enhancing the fixture's adaptability to workpieces of different sizes.

[0041] Combination Figure 1-4 The clamping drive mechanism is a cylinder drive mechanism 7, but it can also be a hydraulic drive mechanism, a manual drive mechanism, or a motor drive mechanism. This diverse selection of drive methods allows users to flexibly configure the system according to actual usage scenarios, cost budgets, and on-site power conditions: pneumatic methods offer fast response and are clean and environmentally friendly; hydraulic methods provide strong clamping force and are stable and reliable; and manual methods have a simple structure, require no external power source, and are suitable for small-batch or temporary processing, thus significantly improving the applicability and economy of the fixture.

[0042] Combination Figure 1-9 The reference base 2 has a clamping guide groove 2-3 and a panel 8 on its surface. The panel 8 limits the convex tail 3-1 of the gripper 3 in the clamping guide groove 2-3. In this way, the gripper 3 is always constrained by the guide groove during movement, ensuring that the gripper 3 moves in a straight line and avoiding problems such as insecure clamping or inaccurate positioning due to skew.

[0043] Combination Figure 5 The gripper 3 contacts the surface of the panel 8 via a discontinuous sliding surface 9; the wedge-shaped expansion block 4 contacts the surface of the gripper 3 via the discontinuous sliding surface 9. With this structure, compared to the traditional method of sliding through a continuous surface, the discontinuous sliding surface 9 reduces sliding friction, resulting in minimal resistance, faster response, and greater clamping force when the gripper 3 contracts and clamps. This allows for a greater effective clamping force under the same driving force, while also reducing wear on the sliding surface and extending the service life of the fixture.

[0044] Furthermore, the discontinuous sliding surface 9 is composed of point contact, line contact, or discontinuous surface.

[0045] Combination Figure 1-9The panel 8 has a guide clearance hole 8-1, and both sides of the guide clearance hole 8-1 are provided with sealing mounting grooves 8-2. A follow-up sealing assembly is provided at the top of the guide clearance hole 8-1. At least one set of the follow-up sealing assembly is provided, and each set includes a fixed sealing plate 10 and a movable sealing plate 11. Two fixed sealing plates 10 are provided in the same set and cover both ends of the clamping guide groove 2-3. The two sides of the same fixed sealing plate 10 extend into the sealing mounting grooves 8-2 of the two panels 8, respectively. Two movable sealing plates 11 are provided in the same set and both cover the... Above the clamping guide groove 2-3, one side wall of the movable sealing plate 11 extends into the sealing mounting groove 8-2 of one of the panels 8. The other side wall of the movable sealing plate 11 is provided with a mounting clearance groove 11-1 for avoiding the gripper 3. The two movable sealing plates 11 are symmetrically arranged on both sides of the gripper 3. One end of the movable sealing plate 11 overlaps one end of one of the fixed sealing plates 10, and the other end of the movable sealing plate 11 overlaps one end of the other fixed sealing plate 10. The guide clearance hole 8-1 and the clamping guide groove 2-3 constitute the convex tail guide groove. With the above structure, on the one hand, it can prevent impurities such as iron filings from entering the interior from the clamping guide groove 2-3, protecting the internal structure from being affected by impurities. On the other hand, it creates a relatively flat surface, which is convenient for cleaning and reduces cleaning time.

[0046] Furthermore, one end of the guide clearance hole 8-1 is an open structure, and the other end is a closed structure. This design facilitates the insertion or removal of components such as the wedge-shaped expansion block 4 and the gripper 3 from the open end during assembly and maintenance, reducing assembly difficulty. It also provides necessary clearance space for the movement of the drive end, while the closed end restricts the extreme positions of the moving parts, playing a limiting and protective role.

[0047] Furthermore, the panel 8 and the reference base 2 are a composite assembly structure, with the panel 8 being a steel plate and the reference base 2 being an aluminum alloy plate. The advantage of this design is that the steel plate has high hardness and wear resistance, capable of withstanding the wear caused by frequent sliding of the grippers 3, ensuring long-term accuracy; the aluminum alloy plate is lightweight and easy to process, reducing the overall weight and manufacturing cost of the fixture. This composite assembly leverages the advantages of each material while facilitating separate processing and replacement, improving the fixture's overall performance and economy.

[0048] Furthermore, the reference base 2 is an integrated structure. It has good overall rigidity, avoiding assembly errors and relative looseness that may occur with split structures. This helps ensure positional accuracy between each clamping station, simplifies the assembly process, and improves the overall stability of the fixture.

[0049] Furthermore, the movable sealing plate is not limited to one embodiment. The movable sealing plate is an integral structure and is located in front of or behind the moving direction of the gripper, and is connected to the bottom of the gripper for sealing the guide groove.

[0050] Combination Figure 1-4 An adjustable support structure is provided below the reference base 2. This adjustable support structure includes an upper support plate 12, a lower support plate 13, and a double-ended screw 14. The double-ended screw 14 is threaded between the upper support plate 12 and the lower support plate 13, and the upper support plate 12 is supported on the bottom surface of the reference base 2. By rotating the double-ended screw 14, the distance between the upper support plate 12 and the lower support plate 13 can be precisely adjusted, thereby changing the support height of the reference base 2. This structure can compensate for the unevenness of the machine tool worktable, ensuring that the reference base 2 is in a horizontal and stable state, thus guaranteeing the reference accuracy of workpiece clamping. At the same time, when it is necessary to change workpieces of different thicknesses or adjust the overall height of the fixture, adjustments can be made quickly, enhancing the adaptability of the fixture to different machine tools and processing conditions.

[0051] Combination Figure 1-9 The working principle of the suspended drive automatic centering fixture in this embodiment is as follows:

[0052] During operation, the workpiece is first placed in the corresponding clamping station, and the clamping drive mechanism of each group of synchronous centering clamping mechanisms is activated. The drive end of the clamping drive mechanism retracts, driving the wedge-shaped expansion block 4 to move downward. Under the guidance of the inclined sliding fit structure and the inclined surface fit, the two jaws 3 of the same group are simultaneously pushed to move in opposite directions along the clamping guide groove 2-3, thereby achieving the clamping of the workpiece.

[0053] Furthermore, during the clamping process, since the clamping drive mechanism is mounted on the reference base 2 via a transverse sliding structure, and can be transversely adjusted relative to the reference base 2 in the clamping adjustment state, when the gripper 3 contacts the workpiece and continues to advance, the workpiece will generate a reverse force on the gripper 3. This reverse force is transmitted to the clamping drive mechanism through the gripper 3 and the wedge-shaped expansion block 4, causing the entire clamping drive mechanism, along with the wedge-shaped expansion block 4 and the gripper 3, to automatically make a small transverse movement along the transverse sliding groove 2-2 until the gripper 3 on both sides and the workpiece reach force balance, and the center of the workpiece is automatically determined. In other words, the transverse movement of the clamping drive mechanism is not pre-adjusted actively, but adaptively follows the reverse push of the workpiece during the clamping process, thereby achieving automatic centering of the workpiece position. This follow-up centering mechanism enables the fixture to automatically compensate for deviations in the workpiece's external dimensions or offsets in its placement, ensuring that the workpiece center remains consistent after each clamping, thus improving machining accuracy.

[0054] During the movement of the gripper 3, the gripper 3 contacts the surface of the panel 8 through the discontinuous sliding surface 9 (which is composed of point contact, line contact or discontinuous surface). The wedge-shaped expansion core block 4 also contacts the surface of the gripper 3 through the discontinuous sliding surface 9. This discontinuous sliding surface 9 significantly reduces the sliding friction, so that the gripper 3 has very little resistance when it contracts and clamps, responds faster, and has a greater clamping force.

[0055] The follow-up sealing assembly on panel 8 plays a protective role during the movement of the gripper 3. When the gripper 3 moves, the movable sealing plate 11 slides relative to it, always covering the opening of the clamping guide groove 2-3, effectively preventing impurities such as iron filings from entering the fixture, while keeping the surface of the reference seat 2 flat for easy cleaning.

[0056] The technical solution of the present invention mainly achieves the following technical effects:

[0057] 1. By setting at least one set of synchronous centering clamping mechanism and combining it with workpiece reference positioning clamping block, multiple clamping stations can be formed (between workpiece reference positioning clamping block and jaws, or between two adjacent sets of jaws), so as to realize the simultaneous clamping of multiple workpieces and significantly improve batch processing efficiency.

[0058] 2. By using a wedge-shaped expansion block to drive the symmetrical jaws on both sides through an oblique sliding fit structure, the two jaws move synchronously and symmetrically, thereby automatically positioning the workpiece center, ensuring the consistency of the workpiece clamping position, and improving machining accuracy.

[0059] 3. The clamping drive mechanism of the present invention moves laterally relative to the reference seat in the clamping adjustment state, thereby changing the distance between the clamping jaw and the workpiece reference positioning clamping block or adjacent clamping jaw, that is, adjusting the size of the clamping station, which can flexibly adapt to workpieces of different sizes and enhance the versatility of the fixture.

[0060] 4. The moving drive of the wedge-shaped expansion block of the present invention allows the jaws on both sides to open and close synchronously. Without the need to adjust each jaw separately, it can automatically adapt to the actual size of the workpiece to complete centering and clamping, reducing the number of manual centering and adjustment steps.

[0061] 5. Discontinuous sliding surfaces: The grippers and the panel, as well as the wedge-shaped expansion block and the grippers, are connected by point contact, line contact, or discontinuous surfaces, which significantly reduces sliding friction, resulting in low resistance, fast response, and large clamping force when the grippers are clamped. At the same time, it reduces wear and extends service life.

[0062] 6. The cooperation between the fixed sealing plate and the movable sealing plate effectively prevents impurities such as iron filings from entering the clamping guide groove, protecting the internal structure and making the surface flat for easy cleaning.

[0063] 7. The panel is made of steel plate (high hardness, wear-resistant), and the reference base is made of aluminum alloy plate (lightweight, easy to process, low cost), balancing accuracy and weight, facilitating processing and replacement, and improving overall performance.

[0064] 8. By adjusting the distance between the upper and lower support plates using a double-ended screw, the unevenness of the worktable can be compensated, the height of the fixture can be adjusted, the reference accuracy can be guaranteed, and the adaptability to different machine tools and workpieces can be enhanced.

[0065] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A suspended drive automatic centering fixture, characterized in that, Includes a base and a reference seat and a synchronous centering clamping mechanism mounted on the base; The synchronous centering clamping mechanism is provided in at least one set. Each set of synchronous centering clamping mechanisms includes a jaw, a wedge-shaped expansion block, and a clamping drive mechanism for driving the wedge-shaped expansion block to move and for lateral adjustment relative to the reference seat in the clamping adjustment state. There is at least one jaw in the same set. The wedge-shaped expansion blocks are respectively connected to the jaws through an oblique sliding fit structure. The drive end of the clamping drive mechanism is directly or indirectly fixedly connected to the wedge-shaped expansion block. The clamping drive mechanism is movably mounted on the reference seat. The reference base is provided with at least one workpiece reference positioning clamping block. The space between the workpiece reference positioning clamping block and the jaws of the adjacent synchronous centering clamping mechanism or the space between the jaws of two adjacent synchronous centering clamping mechanisms constitutes a clamping station.

2. The suspended drive automatic centering fixture according to claim 1, characterized in that, The same set of grippers has two and is symmetrically arranged on both sides of the wedge-shaped expansion block; both ends of the reference base are provided with the workpiece reference positioning clamping block, and the gripper is located between the two workpiece reference positioning clamping blocks; The bottom of the gripper is provided with an integrally formed convex tail, and the reference base is provided with a convex tail guide groove that mates with the convex tail. When clamping the workpiece, the oblique sliding mating surface between the wedge-shaped expansion block and the gripper bears the clamping lateral force and the turning torque. The convex tail and the convex tail guide groove play the role of lateral guidance and auxiliary limiting. The convex tail and the convex tail guide groove are in contact through a discontinuous sliding surface.

3. The suspended drive automatic centering fixture according to claim 1, characterized in that, The clamping drive mechanism is movably mounted on the reference base via a transverse sliding structure. The transverse sliding structure includes an adaptive transverse movement hole, a transverse sliding groove, and a transverse sliding block. The adaptive transverse movement hole and the transverse sliding groove are both formed on the reference base. The transverse sliding block cooperates with the transverse sliding groove. The clamping drive mechanism is fixedly mounted on the transverse sliding block. The drive end of the clamping drive mechanism passes through the transverse sliding groove and the adaptive transverse movement hole and is fixedly connected to the wedge-shaped expansion block.

4. The suspended drive automatic centering fixture according to claim 1, characterized in that, The clamping drive mechanism includes a cylinder drive mechanism, a hydraulic drive mechanism, a manual drive mechanism, or a motor drive mechanism.

5. The suspended drive automatic centering fixture according to claim 1, characterized in that, The oblique sliding fit structure is a dovetail groove or a T-groove; The wedge-shaped expansion block and the gripper are in contact through a discontinuous sliding surface; the gripper slides laterally through the discontinuous sliding surface. The discontinuous sliding surface is composed of point contact, line contact, or intermittent surface.

6. The suspended drive automatic centering fixture according to claim 1, characterized in that, The reference base is provided with a clamping guide groove and a panel, and the panel limits the convex tail of the gripper in the clamping guide groove.

7. The suspended drive automatic centering fixture according to claim 6, characterized in that, The panel has guide clearance holes, and both sides of the guide clearance holes have sealing mounting grooves. A follow-up sealing assembly is located at the top of the guide clearance holes. There is at least one set of follow-up sealing assemblies, each set including a fixed sealing plate and a movable sealing plate. Two fixed sealing plates are provided in the same set, covering both ends of the clamping guide groove. The side walls of the same fixed sealing plate extend into the sealing mounting grooves of the two panels. Two movable sealing plates are provided in the same set, both covering the clamping guide groove. One side wall of the movable sealing plate extends into the sealing mounting groove of one of the panels, and the other side wall of the movable sealing plate has a mounting clearance groove for avoiding the gripper. The two movable sealing plates are symmetrically arranged on both sides of the gripper. One end of the movable sealing plate overlaps one end of one of the fixed sealing plates, and the other end of the movable sealing plate overlaps one end of the other fixed sealing plate. One end of the guide clearance hole is an open structure, and the other end is a closed structure.

8. The suspended drive automatic centering fixture according to claim 6, characterized in that, The panel and the reference base are a composite assembly structure, the panel is made of steel plate and the reference base is made of aluminum alloy plate.

9. The suspended drive automatic centering fixture according to claim 1, characterized in that, The reference base is an integrated structure.

10. The suspended drive automatic centering fixture according to claim 1, characterized in that, An adjustable support structure is provided below the reference base. The adjustable support structure includes an upper support plate, a lower support plate, and a double-ended screw. The double-ended screw is set between the upper support plate and the lower support plate through a threaded structure. The upper support plate is supported on the bottom surface of the reference base.

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