Hydraulic clamping fixture for large workpieces
By designing a hydraulically driven clamping mechanism, the problem of CNC machining center fixtures requiring multiple manual movements for positioning was solved, achieving precise positioning and efficient clamping of large workpieces, thus improving processing efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-03-31
AI Technical Summary
Existing CNC machining center fixtures require manual movement multiple times after the workpiece is placed in order to accurately position it, resulting in slow processing, low efficiency, and laborious operation, especially for large workpieces that are heavy and difficult to move.
Design a hydraulic clamping fixture for large workpieces, which adopts a clamping mechanism composed of a lever cylinder, a rotary cylinder and a linear cylinder. The workpiece is accurately positioned and clamped by hydraulic oil drive, reducing manual operation.
It achieves one-time precise positioning and clamping of the workpiece, improves processing efficiency, reduces manual operation time and labor consumption, and avoids damage to the workpiece during movement.
Smart Images
Figure CN224059299U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic tooling fixture technology, and in particular to a hydraulic clamping fixture for large workpieces. Background Technology
[0002] A CNC machining center is a type of CNC machine tool with multiple functions. It integrates milling, boring, drilling, tapping, and thread cutting functions into a single machine, enabling it to perform various machining processes. The machining center is equipped with a tool magazine containing a different number of various cutting tools, which are automatically selected and changed by the program during machining. This is the main difference between it and CNC milling machines and CNC boring machines. When machining a workpiece, a CNC machining center needs to use a fixture to clamp the workpiece, thus completing the machining process. Fixtures are an indispensable part of the CNC machining process and a significant factor affecting machining accuracy and efficiency. A fixture is a device used in mechanical manufacturing to fix the workpiece in the correct position for machining or inspection; it is also called a clamp. In any step of the manufacturing process, any device used to quickly, conveniently, and safely install a workpiece can be called a fixture.
[0003] In existing technologies, fixtures all have a certain gap to facilitate the placement and removal of workpieces. When machining shells or large workpieces, the machining center places the workpiece in the fixture. After the workpiece is placed, it needs to be manually moved multiple times to push it to a precise position before clamping. This repeated movement of large workpieces results in slow processing and low processing efficiency. Moreover, the large workpieces themselves are heavy and not easy to move, making the operation time-consuming and labor-intensive. This utility model discloses a hydraulic clamping fixture for large workpieces to solve the above problems. Utility Model Content
[0004] The purpose of this utility model is to solve the technical problem that existing CNC machining center fixtures require manual movement of the workpiece multiple times after it is placed in the workpiece to push it to a precise position before clamping it. This repeated movement of large workpieces results in slow processing, low processing efficiency, and the large weight of the workpieces makes them difficult to move, making the operation time-consuming and labor-intensive. The present invention provides a hydraulic clamping fixture for large workpieces to solve the above technical problems.
[0005] A hydraulic clamping fixture for large workpieces, characterized in that it comprises a clamping body, a clamping mechanism, a positioning device, and a supporting mechanism. The clamping body has an irregular hollow structure in the middle. The clamping mechanism, positioning device, and supporting mechanism are assembled on the clamping body and distributed around the irregular hollow structure in the middle of the clamping body. The clamping mechanism consists of a lever cylinder assembly, a rotary cylinder assembly, and a linear cylinder assembly. The positioning device consists of a positioning bracket and a positioning support. The supporting mechanism consists of a support shaft and a support shaft support seat, with the support shaft mounted on the support shaft support seat. The lever cylinder assembly consists of a lever cylinder and a lever cylinder support seat, with the lever cylinder assembled on the lever cylinder support seat. The rotary cylinder assembly consists of a rotary cylinder and a rotary cylinder support seat, with the rotary cylinder assembled on the rotary cylinder support seat. On the rotating cylinder support base, the straight-line cylinder assembly consists of a straight-line cylinder and a straight-line cylinder support base. The front end of the output shaft of the straight-line cylinder is connected to a rubber block. The straight-line cylinder is assembled on the straight-line cylinder support base. There are four sets of lever cylinder assemblies, which are distributed in the four corner frames of the clamping body. There are four sets of rotating cylinder assemblies, which are distributed in the four corner frames of the clamping body and adjacent to the lever cylinder assemblies. There are four sets of straight-line cylinder assemblies, which are distributed in pairs in the two adjacent side frames of the clamping body. There are six positioning devices, which are distributed in groups of three in the two adjacent side frames of the clamping body and in different side frames from the straight-line cylinder assemblies of the clamping body. There are eight support mechanisms, four of which are distributed inside the irregular hollow structure in the middle of the clamping body, and the other four are distributed on the periphery of the irregular hollow structure in the middle of the clamping body.
[0006] Furthermore, the support shaft is mounted on the clamping body via a support shaft support seat, the rotary cylinder is assembled on the clamping body via a rotary cylinder support seat, the linear cylinder is assembled on the clamping body via a linear cylinder support seat, and the lever cylinder is assembled on the clamping body via a lever cylinder support seat.
[0007] Furthermore, the rotation angle of the rotary cylinder is 90°.
[0008] Furthermore, a plastic protective sleeve is provided on the outside of the positioning support.
[0009] Furthermore, the clamp body is equipped with an oil passage inside, which is connected to the lever cylinder, the rotary cylinder, the linear cylinder and the threaded linear cylinder. One side of the clamp body is provided with an oil inlet and an oil outlet, which are connected to the oil passage.
[0010] Compared with the prior art, the advantages of this utility model include:
[0011] 1. By using a linear hydraulic cylinder to replace manual labor, large workpieces are horizontally pushed and aligned with the positioning device. Positioning is successful on the first attempt, accurate, time-saving, labor-saving, and highly efficient. The positioning support of the positioning device is equipped with a plastic protective sleeve on the outside, and a rubber block is set at the front end of the output shaft of the linear hydraulic cylinder. When the linear hydraulic cylinder assembly pushes the large workpiece horizontally and aligns it with the positioning support without gaps, the rubber block and plastic protective sleeve can protect the appearance of the large workpiece and avoid damage during the pushing process.
[0012] 2. Hydraulic oil is injected through the oil inlet. The hydraulic oil flows along the oil passage inside the clamping body, thereby triggering the linear cylinder to push the large workpiece to fit and position the workpiece, completing the positioning of the workpiece. This triggers the lever cylinder and rotary cylinder to complete the clamping action of the large workpiece, saving time and effort and greatly improving production efficiency. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0014] Figure 1 This is a top view of the structure of a large workpiece hydraulic clamping fixture provided in this embodiment of the utility model;
[0015] Figure 2 This is a three-dimensional structural view of a lever cylinder assembly in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention.
[0016] Figure 3 This is a three-dimensional structural view of the rotary cylinder assembly in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention.
[0017] Figure 4 This is a three-dimensional structural view of the straight-line cylinder assembly in a hydraulic clamping fixture structure for large workpieces provided in this embodiment of the present utility model;
[0018] Figure 5 This is a three-dimensional structural view of the positioning device in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention;
[0019] Figure 6 This is a three-dimensional structural view of the support mechanism in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention;
[0020] Figure 7 This is a schematic diagram of the internal oil circuit of the clamping body in a hydraulic clamping fixture for large workpieces provided in this embodiment of the utility model;
[0021] In the attached diagram: 1. Clamping body; 2. Clamping mechanism; 3. Positioning device; 4. Support mechanism; 201. Lever cylinder assembly; 202. Rotary cylinder assembly; 203. Straight cylinder assembly; 301. Positioning bracket; 302. Positioning support column; 401. Support shaft; 402. Support shaft support seat; 2011. Lever cylinder; 2012. Lever cylinder support seat; 2021. Rotary cylinder; 2022. Rotary cylinder support seat; 2031. Straight cylinder; 2032. Straight cylinder support seat; 5. Oil passage; 501. Oil inlet; 502. Oil outlet. Detailed Implementation
[0022] In view of the shortcomings of the prior art, this invention, through long-term research and extensive practice, has yielded the technical solution of this utility model. The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments.
[0023] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0024] Example 1
[0025] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 1 This is a top view of the structure of a large workpiece hydraulic clamping fixture provided in this embodiment of the utility model; Figure 2 This is a three-dimensional structural view of the lever cylinder assembly in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention. Figure 3 This is a three-dimensional structural view of the rotary cylinder assembly in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention. Figure 4 This is a three-dimensional structural view of the straight-line cylinder assembly in a hydraulic clamping fixture structure for large workpieces provided in this embodiment of the present utility model; Figure 5 This is a three-dimensional structural view of the positioning device in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention; Figure 6 This is a three-dimensional structural view of the support mechanism in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention; Figure 7This is a schematic diagram of the internal oil circuit of the clamping body in a hydraulic clamping fixture for large workpieces provided in this embodiment of the present invention; a hydraulic clamping fixture for large workpieces: characterized in that: it includes a clamping body 1, a clamping mechanism 2, a positioning device 3, and a supporting mechanism 4. The middle part of the clamping body 1 is an irregular hollow structure. The hollow structure design reduces the overall weight of the clamping body, making the fixture lightweight. The clamping mechanism 2, the positioning device 3, and the supporting mechanism 4 are assembled on the clamping body 1 and are distributed around the irregular hollow structure in the middle part of the clamping body 1. The clamping mechanism 2 is composed of a lever cylinder assembly 201, a rotary cylinder assembly 202, and a linear cylinder assembly 203. The positioning device 3 is composed of a positioning bracket 301 and a positioning support column 302. A plastic protective sleeve is provided on the outside of column 302. When the straight-line hydraulic cylinder assembly pushes the large workpiece horizontally and fits seamlessly with the positioning column, the plastic protective sleeve can protect the appearance of the large workpiece and prevent damage during the pushing process. The support mechanism 4 consists of a support shaft 401 and a support shaft support seat 402. The support shaft 401 is mounted on the support shaft support seat 402 and is mounted on the clamping body 1 via the support shaft support seat 402. The lever cylinder assembly 201 consists of a lever cylinder 2011 and a lever cylinder support seat 2012. The lever cylinder 2011 is assembled on the lever cylinder support seat 2012 and is assembled on the clamping body 1 via the lever cylinder support seat 2012. The lever cylinder supports the large workpiece. The workpiece is clamped and fixed. The rotary cylinder assembly 202 consists of a rotary cylinder 2021 and a rotary cylinder support 2022. The rotary cylinder 2021 is assembled on the rotary cylinder support 2022 and is mounted on the clamping body 1 via the rotary cylinder support 2022. The rotary cylinder 2021 rotates 90°, and its output shaft rotates 90° to clamp and release the workpiece. The linear cylinder assembly 203 consists of a linear cylinder 2031 and a linear cylinder support 2032. The output shaft of the linear cylinder is connected to a rubber block 2033. The linear cylinder 2031 is assembled on the linear cylinder support 2032, and its output shaft is mounted on the linear cylinder support 2032 via the linear cylinder support 2022. The support base 2032 is assembled on the clamp body 1. There are four sets of lever cylinder assemblies 201, distributed within the four corner frames of the clamp body 1. There are four sets of rotary cylinder assemblies 202, distributed within the four corner frames of the clamp body 1 and adjacent to the lever cylinder assemblies 201. There are four sets of linear cylinder assemblies 203, distributed in pairs within two adjacent side frames of the clamp body 1. There are six positioning devices 3, distributed in groups of three within two adjacent side frames of the clamp body 1, but located in different side frames from the linear cylinder assemblies 203. There are eight support mechanisms 4, four located inside the irregular hollow structure in the middle of the clamp body 1, and the other four located on the periphery of the irregular hollow structure in the middle of the clamp body 1. The clamp body 1 has an internal oil passage 5.The hydraulic circuit 5 is connected to the lever cylinder 201, the rotary cylinder 202, and the straight-line cylinder 203. One side of the clamping body 1 is provided with an oil inlet 501 and an oil outlet 502, which are connected to the hydraulic circuit 5. Hydraulic oil enters the hydraulic circuit 5 through the oil inlet 501 and flows along the hydraulic circuit 5 inside the clamping body 1, thereby triggering the output shaft of the straight-line cylinder to extend, pushing the large workpiece to engage with the positioning device, completing the precise positioning of the large workpiece. This replaces manual positioning of the large workpiece, ensuring accurate positioning and saving time and effort. The entry of hydraulic oil also triggers the lever cylinder and the rotary cylinder to work, completing the clamping action of the large workpiece, saving time and effort and greatly improving production efficiency. The straight-line cylinder pushes the workpiece to engage with the positioning device and can also clamp the workpiece, further ensuring the stability of the large workpiece clamping.
[0026] In summary, the working principle of this utility model is as follows: During use, a large workpiece is placed into the fixture, and hydraulic oil enters from the oil inlet. The hydraulic oil flows along the oil passage inside the fixture, thereby triggering the straight-line cylinder to push the large workpiece to fit with the positioning device, completing the precise positioning of the large workpiece. This triggers the lever cylinder and the rotary cylinder to work, completing the clamping action of the large workpiece.
[0027] In addition, in specific embodiments, rubber protective sleeves can be added to the positions where the lever cylinder assembly, rotary cylinder assembly, linear cylinder assembly, positioning device and support mechanism come into contact with the large workpiece. This can protect the appearance of the workpiece when it is fixed and clamped, avoid appearance damage during the clamping process, and improve appearance quality.
[0028] This utility model provides a hydraulic clamping fixture for large workpieces. It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, intended to enable those skilled in the art to understand its content and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. Any simple modifications and substitutions made using the content of this utility model are included within the scope of protection of this utility model.
Claims
1. A hydraulic clamp for clamping large workpieces, characterized in that: The utility model relates to a clamping device, including clamping body, clamping mechanism, positioning device and support mechanism, the middle part of clamping body is irregular hollow structure, clamping mechanism, positioning device and support mechanism are assembled on clamping body and are assembled distribution in the periphery of irregular hollow structure in the middle part of clamping body, clamping mechanism is composed of lever oil cylinder assembly, rotary oil cylinder assembly and straight oil cylinder assembly, positioning device is composed of positioning support and positioning pillar, support mechanism is composed of support shaft and support shaft support seat, support shaft is installed on support shaft support seat, lever oil cylinder assembly is composed of lever oil cylinder and lever oil cylinder support seat, lever oil cylinder is assembled on lever oil cylinder support seat, rotary oil cylinder assembly is composed of rotary oil cylinder and rotary oil cylinder support seat, rotary oil cylinder is assembled on rotary oil cylinder support seat, straight oil cylinder assembly is composed of straight oil cylinder and straight oil cylinder support seat, the output shaft front end of straight oil cylinder is connected rubber block, straight oil cylinder is assembled on straight oil cylinder support seat, lever oil cylinder assembly has four groups, is distributed in four corner frames of clamping body respectively, rotary oil cylinder assembly has four groups, is distributed in four corner frames of clamping body respectively and is adjacent with lever oil cylinder assembly, straight oil cylinder assembly has four groups, and two two distributions are in the two edge frames of clamping body adjacent, positioning device has six, three three distributions are in the two edge frames of clamping body adjacent and with straight oil cylinder assembly distribution in the different edge frame of clamping body, support mechanism has eight, wherein four are distributed in the inside of irregular hollow structure in the middle part of clamping body, and the other four are distributed in the periphery of irregular hollow structure in the middle part of clamping body.
2. A hydraulic fixture for holding large workpieces according to claim 1, characterized in that: The support shaft is installed on the clamping body through the support shaft support seat, the rotary oil cylinder is assembled on the clamping body through the rotary oil cylinder support seat, the straight oil cylinder is assembled on the clamping body through the straight oil cylinder support seat, and the lever oil cylinder is assembled on the clamping body through the lever oil cylinder support seat.
3. A hydraulic fixture for holding large workpieces according to claim 1, wherein: The rotation angle of the rotary cylinder is 90 degrees.
4. The hydraulic fixture of claim 1 wherein: The positioning pillar is provided with a plastic protective sleeve on the outer side.
5. The hydraulic fixture of claim 1 wherein: The clamping body is provided with an oil channel, and the oil channel is communicated with the lever oil cylinder, the rotary oil cylinder, the straight oil cylinder and the threaded linear oil cylinder. One side of the clamping body is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are communicated with the oil channel.