Workpiece clamping device
By setting a spiral groove on the pneumatic rod to engage with the spiral pattern of the support plate, and combining the adjustment of the threaded rod and the locking nut, the problem of the inability to independently adjust the height of the pressing component and the non-reconfigurable support space in the spiral lifting mechanism is solved. This achieves adaptive height adjustment of the pressing block and flexible reconfiguration of the support space, adapting to the clamping requirements of different workpieces.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIXIA LIANGFAN AUTO PARTS CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-10
AI Technical Summary
In existing screw lifting mechanisms, the height of the pressing component cannot be adjusted independently of the rotation path, and the fixed support space cannot be dynamically reconfigured, resulting in insufficient flexibility of the clamping device when handling workpieces of different shapes and sizes.
A workpiece clamping device was designed. By setting a helical groove on the pneumatic rod and engaging it with the helical pattern of the support plate, the pneumatic rod can be lifted and rotated. The height and position of the pressure block can be adjusted independently by the cooperation of the threaded rod and the locking nut. At the same time, the long and short plate structure of the support plate forms a reconfigurable support space.
It achieves adaptive height adjustment of the clamping block and flexible reconstruction of the support space, expands the workpiece operation window, adapts to the clamping requirements of workpieces of different thicknesses and shapes, and improves the flexibility and adaptability of the clamping device.
Smart Images
Figure CN224476091U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of workpiece clamping technology, and in particular to a workpiece clamping device. Background Technology
[0002] ① Early workpiece clamping devices often used pneumatic rods that were directly driven by cylinders for vertical lifting, with a pressing component mounted at the top moving linearly along a fixed trajectory. When the pneumatic rod was in the raised state, the height of the opening between the pressing block and the workpiece support surface was limited by the cylinder stroke, and the pressing block was always suspended directly above the operating area of the automotive parts. This structure meant that when placing automotive parts, it was necessary to precisely avoid the projection range of the pressing block, especially for workpieces with protrusions or irregular contours, which often required tilting during placement. The operating window was effectively equivalent to a narrow gap between the bottom surface of the pressing block and the support surface. The fundamental problem with this existing system is that the linear lifting mechanism only allows for vertical space release, with no horizontal displacement, resulting in a narrow effective operating volume.
[0003] ② A subsequent improvement introduces a helical drive assembly, enabling the pneumatic rod to rotate synchronously during lifting and lowering. In practice, a cylinder drives the pneumatic rod with helical grooves through the helical guide hole in the support plate. As the pneumatic rod rises, it rotates along the helical path, deviating from its original position, and the pressing assembly rotates away from directly above the automotive parts. This structure allows the pressing block end to generate an incremental horizontal displacement in the non-pressing state, expanding the area where the automotive parts are placed from the original vertical gap into a fan-shaped space centered on the pneumatic rod. Through trajectory conversion, the helical structure transforms the vertical stroke into a horizontal clearance distance, physically expanding the workpiece operating opening.
[0004] ③ However, the aforementioned screw lifting device still has two limitations: First, the rotation angle of the pneumatic rod is proportional to the lifting height, and the end height of the pressure block is always determined by the screw lead. When clamping ultra-thin or extra-thick automotive parts, the base height of the pressure block cannot be adjusted independently of the rotation path, resulting in excessive crushing of thin parts or insufficient pressing force for thick parts. Second, the spatial division mode of the support plate is fixed, and the relative positions of the long support space and the short support space formed by the partition plate cannot be reconfigured. When facing irregularly shaped automotive workpiece combinations that require changing the positioning reference (such as the short support space needing to change from a longitudinal angle mode to a transverse rounded corner mode), the entire device needs to be disassembled and reassembled. The screw lifting structure sacrifices the freedom of height adjustment in exchange for horizontal clearance space, and the fixed support combination lacks spatial vector strain capability. Its essential defect lies in the insufficient dynamic expandability of the mechanism. Utility Model Content
[0005] The purpose of this utility model is to provide a workpiece clamping device that solves the problem that the height of the pressing component in the screw lifting mechanism cannot be adjusted independently of the rotation path, and at the same time overcomes the defect that the fixed support space cannot dynamically reconfigure the spatial orientation.
[0006] To achieve the above objectives, this utility model provides a workpiece clamping device, comprising a plurality of cylinders. Each cylinder has a pneumatic rod at its top end, a spiral groove on its radially outer side, and an internal thread groove at its top end. Threaded rods are threadedly installed in the internal thread grooves, and locking nuts are threadedly installed on the radially outer side of each threaded rod. A cross brace is fixedly installed at the top end of each threaded rod, and a pressure block is threadedly installed on the bottom surface of the other end of each cross brace. A support plate is bolted to the top end of each cylinder.
[0007] The support plate has a long dividing plate and a short dividing plate perpendicular to the long dividing plate at the top center, so that the top of the support plate forms a set of long support spaces and two sets of short support spaces for workpiece support and positioning.
[0008] The junction center points of the long and short dividing plates are respectively perpendicularly through the support plate and have through holes, and the through holes are respectively provided with spiral patterns.
[0009] When the support plate is fixed to the cylinder, the pneumatic rod passes through the through hole, and the spiral groove and spiral thread mesh to form a pneumatic rod lifting and rotating spiral structure. The bottom end of the cylinder is fixedly installed with a base plate.
[0010] The base plate extends from the center point to both sides laterally and longitudinally, and has through holes. Adjusting screws pass through the through holes on both sides laterally or longitudinally.
[0011] The ends of the adjusting screws are respectively threaded into the adjusting screw holes, which are respectively opened on both sides of the top of the sliding block, and the sliding blocks are respectively slidably installed in the sliding groove.
[0012] The sliding grooves are in multiple sets and spaced apart on the top of the fixed platform, and the fixed platform has fixing holes at the four corners for bolts to pass through to form an integral fixing structure.
[0013] This utility model discloses a workpiece clamping device. A support plate component is rigidly fixed to the top of a cylinder by bolts. A pneumatic rod connected to the piston end of the cylinder vertically penetrates the central through hole of the support plate. The pneumatic rod has a precision-machined spiral groove structure on its radially outer side. This spiral groove and the spiral pattern matching the inner wall of the through hole of the support plate form a forced engagement pair. An internal threaded groove cavity is axially formed on the end face of the top of the pneumatic rod. A threaded rod assembly is installed within the internal threaded groove cavity by threaded engagement. A locking nut component is screwed onto the radially outer surface of the threaded rod. A cross brace structure is fixed to the top of the threaded rod by interference fit or welding. A threaded hole is machined on the bottom surface of the cross brace, and a replaceable pressure block element is installed through threaded engagement.
[0014] In terms of height adjustment, the threaded rod assembly is directly rotated to generate pure axial displacement within the internal threaded groove cavity: when processing ultra-thin workpieces, the reverse rotation of the threaded rod causes the pressure block to rise slightly, eliminating the risk of crushing caused by excessive minimum stroke in traditional devices; when dealing with heavy workpieces, the forward rotation of the threaded rod increases the pressing stroke, solving the problem of pressure force attenuation.
[0015] To address the space constraints, vertically arranged long partitions and orthogonally arranged short partitions on the support plate surface form a rigid physical barrier. The long partitions define a single set of long support spaces, forming an axial through-positioning channel for rod-shaped workpieces. The two sets of short support spaces divided by the short partitions construct the edge positioning boundary for irregularly shaped workpieces. Through the permanent physical existence of this partition system, the geometric contours of the long and short support spaces are forcibly solidified, eliminating the structural defect of "non-reconfigurable relative positions of support spaces" as described in the background technology, which leads to a rigid positioning mode. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.
[0018] Figure 2 This is a structural schematic diagram of the fixing platform according to an embodiment of the present invention.
[0019] Figure 3 This is a schematic diagram of the cylinder structure according to an embodiment of the present invention.
[0020] Figure 4 This is a schematic diagram of the threaded rod in an embodiment of this utility model.
[0021] Figure 5 This is a schematic diagram of the planar structure of the through hole in an embodiment of this utility model.
[0022] In the diagram: 101, cylinder; 102, pneumatic rod; 103, spiral groove; 104, internal thread groove; 105, threaded rod; 106, locking nut; 107, cross brace; 108, pressure block; 109, support plate; 110, long partition plate; 111, short partition plate; 112, long support space; 113, short support space; 114, through hole; 115, spiral pattern; 116, base plate; 117, through hole; 118, adjusting screw; 119, adjusting screw hole; 120, sliding block; 121, sliding groove; 122, fixed platform; 123, fixed hole. Detailed Implementation
[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0024] Please see Figures 1-5 .
[0025] This utility model provides a workpiece clamping device, in which a base plate 116 is mounted on the surface of a fixed platform 122 as a base. The fixed platform 122 has multiple sets of parallel sliding grooves 121 and through four corner fixing holes 123 to form the system foundation. A cylinder 101 is vertically fixed to the center of the top surface of the base plate 116 and has a built-in liftable pneumatic rod 102. A support plate 109 is fastened to the top of the cylinder 101 by bolts to form a bearing platform. A dividing long plate 110 and a perpendicularly intersecting dividing short plate 111 are provided on the surface of the support plate 109 to divide its top end into a set of long support spaces 112 and two sets of short support spaces 112. The support space 113 includes a long support space 112 that provides a through-positioning reference for the rod-shaped workpiece, and a short support space 113 that forms a contour positioning surface for irregularly shaped workpieces through its edge angle. The spiral pattern 115 on the inner wall of the central through hole 114 of the support plate 109 and the radially outer spiral groove 103 of the pneumatic rod 102 passing through it form a meshing guide mechanism, so that the pneumatic rod 102 rotates synchronously when driven to lift by the cylinder 101. The threaded rod 105 is screwed into the internal thread groove 104 at the top of the pneumatic rod 102 to achieve secondary height adjustment. The threaded rod 105 is installed radially outward. The locking nut 106 is used to lock the extension length of the threaded rod 105. The cross brace 107 fixed to the top of the threaded rod 105 transmits the movement to the pressure block 108 at the end. The pressure block 108 is replaceable by threaded connection to adapt to different pressing surfaces. The adjusting screw 118 is selectively inserted into the through holes 117 extending on both the transverse and longitudinal sides of the base plate 116. The end of the adjusting screw 118 is screwed into the adjusting screw hole 119 at the top of the sliding block 120, so that the rotation operation is converted into the displacement of the sliding block 120 in the sliding groove 121 of the fixed table 122. When the adjusting screw is inserted into the transverse through hole 117, the adjustment screw 118 is inserted into the adjusting screw hole 119 at the top of the sliding block 120. When rod 118 is in motion, it drives sliding block 120 to slide laterally. When the longitudinal through hole 117 passes through adjusting screw 118, it drives longitudinal sliding, thereby changing the overall orientation of base plate 116 to reorganize the spatial orientation of long support space 112 and short support space 113. Fixing hole 123 of fixed platform 122 achieves rigid anchoring of the entire device to workbench through bolts. The whole structure ultimately forms a triple functional mechanism: spiral engagement realizes automatic avoidance of lifting and rotating pressure block 108, threaded rod 105 precisely controls pressing stroke through extension and retraction, and base plate 116 sliding system reconstructs the orientation capability of support space combination.
[0026] Working principle: The cylinder 101 acts as a power source to drive the pneumatic rod 102 to move axially up and down. During the lifting and lowering process, the radially outer spiral groove 103 of the pneumatic rod 102 forms a path engagement constraint with the spiral pattern 115 on the inner wall of the through hole 114 of the support plate 109, forcing the pneumatic rod 102 to rotate circumferentially while moving vertically. This composite motion characteristic causes the threaded rod 105 fixed at the top of the pneumatic rod 102 to move up and down and rotate synchronously. At this time, the threaded rod 105 drives the pressure block 108 to change its spatial trajectory through the cross brace 107 installed at its top. In the non-pressing state, the pressure block 108 is lifted and rotated with the pneumatic rod 102 to deviate from the target position. The orientation of the workpiece area significantly expands the operating window for workpiece placement; when the cylinder 101 is driven in the reverse direction, the pressure block 108 descends and rotates along a spiral trajectory to return to the pressing position; the threaded engagement between the threaded rod 105 and the internal thread groove 104 at the top of the pneumatic rod 102 provides a second height adjustment mechanism. By rotating the threaded rod 105 to make it spiral within the internal thread groove 104, the installation height of the cross brace 107 can be independently adjusted, thereby changing the working stroke of the pressure block 108 and achieving adaptive pressing of workpieces of different thicknesses; the partition long plate 110 and the perpendicularly intersecting partition short plate 111 on the surface of the support plate 109 form a multi-area positioning structure: the long support space 112 supports... Rod-shaped and strip-shaped workpieces are provided with through-type axial positioning. Two sets of short support spaces 113 are used to construct the limiting reference for irregularly shaped workpieces by combining the included angles of their edges. When a rounded workpiece is placed in the short support space 113, its arc surface and the three-sided baffle form a three-point positioning effect. When the positioning coordinate system needs to be adjusted, the base plate 116 installed at the bottom of the cylinder 101 drives the sliding block 120 to translate within the sliding groove 121 of the fixed table 122 through the adjusting screw 118 in the through hole 117. The selective penetration of the transverse through hole 117 or the longitudinal through hole 117 causes the axial direction of the adjusting screw 118 to change, thereby causing the sliding direction of the sliding block 120 to be in the transverse groove or the longitudinal groove. The conversion to the slot ultimately changes the spatial orientation configuration of the short support space 113 group and the long support space 112 group; by rotating the screw, the offset of the base plate 116 in the longitudinal and transverse directions is changed, so that the spatial combination composed of multiple support plates 109 can adapt to the variation of the workpiece shape; the above-mentioned multi-level collaborative working mode ultimately achieves three technical effects: the spiral meshing mechanism ensures that the pressure block 108 automatically avoids the working space during the opening and closing process; the partitioned support structure allows the combination of long and short plates to flexibly adapt to various irregular positioning requirements; the directional change capability of the sliding block 120 allows the support space group to be reorganized in spatial orientation; and the sliding adjustment system of the base plate 116 realizes the dynamic calibration of the overall positioning benchmark of the tooling.
[0027] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.
Claims
1. A workpiece clamping device, comprising a plurality of cylinders (101), characterized in that: The cylinder (101) is provided with a pneumatic rod (102) at its top. The pneumatic rod (102) is provided with a spiral groove (103) on its radial outer side. The pneumatic rod (102) is provided with an internal thread groove (104) at its top. A threaded rod (105) is installed in the internal thread groove (104) by thread. A locking nut (106) is installed on the radial outer side of the threaded rod (105) by thread. A cross brace (107) is fixedly installed at the top of the threaded rod (105). A pressure block (108) is installed on the bottom surface of the other end of the cross brace (107) by thread. A support plate (109) is installed on the top of the cylinder (101) by bolts.
2. The workpiece clamping device as described in claim 1, characterized in that: The top of the support plate (109) is provided with a long dividing plate (110) and a short dividing plate (111) perpendicular to the long dividing plate (110), so that the top of the support plate (109) forms a set of long support spaces (112) and two sets of short support spaces (113) for workpiece support and positioning.
3. The workpiece clamping device as described in claim 2, characterized in that: The junction center point of the dividing long plate (110) and the dividing short plate (111) are respectively perpendicularly through the support plate (109) and a through hole (114) is provided. The through hole (114) is provided with a spiral pattern (115).
4. The workpiece clamping device as described in claim 3, characterized in that: When the support plate (109) is fixed to the cylinder (101), the pneumatic rod (102) passes through the through hole (114), and the spiral groove (103) meshes with the spiral pattern (115) to form a lifting and rotating structure of the pneumatic rod (102). The bottom end of the cylinder (101) is fixedly installed with a base plate (116).
5. The workpiece clamping device as described in claim 4, characterized in that: The base plate (116) extends from the center point to both sides laterally and longitudinally and has through holes (117). Adjusting screws (118) pass through the through holes (117) on both sides laterally or longitudinally respectively.
6. The workpiece clamping device as described in claim 5, characterized in that: The ends of the adjusting screws (118) are respectively threaded into the adjusting screw holes (119), the adjusting screw holes (119) are respectively opened on both sides of the top of the sliding block (120), and the sliding blocks (120) are respectively slidably installed in the sliding grooves (121).
7. The workpiece clamping device as described in claim 6, characterized in that: The sliding grooves (121) are in multiple sets and spaced apart on the top of the fixed platform (122). The fixed platform (122) has fixing holes (123) at its four corners for bolts to pass through and form an integral fixing structure.