Clamping device

Abstract

The clamping device is characterized in that a fixing part is used for extending into a fixed matching cavity and can move along a first preset path, when the fixing part is located at the initial end of the first preset path, a preset gap is formed between the fixing part and the inner cavity face of the fixed matching cavity, and when the fixing part is located at the tail end of the first preset path, the preset gap is formed between the fixing part and the inner cavity face of the fixed matching cavity. The multiple fixing parts abut against the inner cavity face of the fixed matching cavity. The first driving piece is used for driving the multiple fixing parts to synchronously move along a first preset path. According to the clamping device, the multiple fixing parts are arranged, the workpiece is fixed from the interior of the workpiece, the surface of the workpiece is prevented from being damaged during external clamping, the multiple fixing parts abut against the inner cavity face of the workpiece, force can be applied to the workpiece from multiple directions, stress is more balanced, the multiple fixing parts are driven by the first driving piece to move synchronously, and the workpiece is more stable. And the integrity of the workpiece can be protected to the maximum extent while the clamping effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of mechanical clamping fixture technology, and in particular to a clamping device. Background Technology

[0002] In many machining processes, such as specific processing of shaft parts, stable and reliable clamping of the workpiece is required to ensure machining accuracy and operational safety. Traditional clamping fixtures often use an inward clamping method, that is, fixing the workpiece by retracting the clamp.

[0003] However, for some workpieces with special structures or surface requirements, this traditional clamping method may damage the workpiece. For example, when machining thin-walled workpieces, the inward clamping force may cause the workpiece to deform and affect its dimensional accuracy. At the same time, for some workpieces with complex internal structures that cannot be supported from the inside, the traditional clamping method is also difficult to meet the clamping requirements, which limits the diversity of machining processes and the improvement of machining accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a clamping device to solve the problems in the prior art, achieve effective and non-destructive clamping of workpieces, and improve processing quality and efficiency.

[0005] This utility model provides a clamping device for clamping and fixing a workpiece, wherein the workpiece has a fixed mating cavity, and the clamping device includes:

[0006] The fastener has multiple fastening portions, each of which extends into the fixed mating cavity. The fastening portions are movable along a first preset path. When the fastening portion is located at the initial end of the first preset path, there is a preset gap between the fastening portion and the inner cavity surface of the fixed mating cavity. When the fastening portion is located at the end of the first preset path, the multiple fastening portions press against the inner cavity surface of the fixed mating cavity.

[0007] The first driving component is used to drive the plurality of fixed parts to move synchronously along the first preset path.

[0008] In the clamping device described above, preferably, the first driving member includes a pull rod, the pull rod includes a main rod body and a driving block, the main rod body has a first end and a second end, the driving block is disposed at the first end of the main rod body, and a first guide slope is formed on the outer circumferential surface of the driving block;

[0009] Multiple fixing parts are arranged in a ring with the main rod body as the center, and a second guide slope is formed on the surface of the fixing part facing the drive block;

[0010] in:

[0011] The first driving member can move along the second preset path. During the movement of the first driving member, the first guide slope and the second guide slope are in contact to drive the multiple fixed parts to move synchronously along the first preset path.

[0012] In the clamping device described above, preferably, the clamping device further includes a base, and the first driving member further includes a driving cylinder, wherein:

[0013] The fixing component and the driving cylinder are both fixedly connected to the base. The output end of the driving cylinder is directly or indirectly connected to the second end of the pull rod, and the pull rod moves along the second preset path.

[0014] In the clamping device described above, preferably, the driving cylinder has a piston, an end cap is connected to the piston, the end cap has a first abutment surface facing the piston, the piston has a second abutment surface facing the first abutment surface, and a preset chamber is formed between the first abutment surface and the second abutment surface;

[0015] The first driving component also includes a connecting block, which is connected to the second end of the pull rod. A protruding ring is provided on the outer circumferential surface of the connecting block, and the protruding ring extends into the preset cavity.

[0016] In the clamping device described above, preferably, the connecting block has an internal threaded groove in the axial direction, and the second end of the pull rod has an external threaded section, the external threaded section being threaded into the internal threaded groove.

[0017] In the clamping device described above, preferably, an adjusting block is provided on the side of the connecting block opposite to the pull rod.

[0018] In the clamping device described above, preferably, the main rod body is provided with a sliding groove that extends along the axial direction of the main rod body;

[0019] The base is provided with a limiting rod, one end of which is connected to the base, and the other end of which extends into the groove.

[0020] Compared with the prior art, this utility model fixes the workpiece from the inside by setting multiple fixing parts, preventing damage to the workpiece surface when clamped from the outside. The multiple fixing parts press against the inner cavity surface of the workpiece, so that force can be applied to the workpiece from multiple directions, and the force is more balanced. The first driving member drives the multiple fixing parts to move synchronously. For some thin-walled, fragile or shape-accurate workpieces, it can protect the integrity of the workpiece to the greatest extent while ensuring the clamping effect. The clamping device has a compact structure, is easy to operate, and can adapt to the clamping needs of workpieces of different sizes and shapes. Attached Figure Description

[0021] Figure 1 This is a perspective view of the clamping device provided in an embodiment of the present invention;

[0022] Figure 2 This is a front view of the clamping device provided in an embodiment of this utility model;

[0023] Figure 3 This is a cross-sectional view of the clamping device provided in an embodiment of this utility model;

[0024] Figure 4 This is a perspective view of the pull rod provided in an embodiment of this utility model;

[0025] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 yes Figure 3 Enlarged view of point B in the middle;

[0027] Figure 7 yes Figure 3 Enlarged view of point C in the middle;

[0028] Figure 8 yes Figure 3 Enlarged view of point D in the middle;

[0029] Figure 9 This is a perspective view of the fixing part provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10-Fixing component, 11-Fixing part, 111-Second guide slope; 112-Recessed part;

[0032] 20-Pull rod, 21-Main rod body, 211-Slide groove, 22-Drive block, 221-First guide slope, 23-External thread section;

[0033] 30 - Base, 31 - Limiting rod;

[0034] 40 - Drive cylinder, 41 - Piston, 411 - Second abutment surface, 42 - End cap, 421 - First abutment surface

[0035] 43-Preset chamber, 44-Connecting block, 441-Protruding ring, 442-Internal thread groove, 45-First air port, 46-Second air port;

[0036] 50 - Adjustment block. Detailed Implementation

[0037] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] See Figure 1-3 As shown, this utility model provides a clamping device for clamping and fixing a workpiece. The workpiece has a fixed mating cavity (not shown in the figure). The clamping device includes: a fixing member 10, which has multiple fixing parts 11. The fixing parts 11 are used to extend into the fixed mating cavity. The fixing parts 11 can move along a first preset path. When the fixing parts 11 are located at the initial end of the first preset path, there is a preset gap between the fixing parts 11 and the inner cavity surface of the fixed mating cavity. When the fixing parts 11 are located at the end of the first preset path, the multiple fixing parts 11 all press against the inner cavity surface of the fixed mating cavity; and a first driving member for driving the multiple fixing parts 11 to move synchronously along the first preset path.

[0039] In the embodiments provided in this application, the workpiece is first placed on the outside of the fixing member 10. The first preset path is the path of multiple fixing parts 11 approaching the inner cavity surface of the fixing cavity from the initial state. In the initial state, there is a preset gap between the fixing parts 11 and the inner cavity surface of the fixing cavity. Under the drive of the first driving member, multiple fixing parts 11 will press against the inner cavity surface of the fixing cavity, thereby clamping the workpiece. This application clamps the workpiece through the inside of the workpiece.

[0040] To accommodate workpieces with complex internal structures, see [link / reference] Figure 9 As shown, the fixing part 11 and the front end form a recessed part 112 that is adapted to the fixed mating cavity, so that the fixing part 11 and the fixed mating cavity fit more closely. When the fixing part 11 moves towards the inner cavity surface, the force on the workpiece is more uniform. In addition, the recessed part 112 fits the curve of the inner cavity surface more precisely, which can play a role in accurate positioning and can also effectively prevent the workpiece and the clamping device from shifting during the clamping process.

[0041] In one possible implementation, see [link to implementation details]. Figure 3-6As shown, the first driving member includes a pull rod 20, which includes a main rod body 21 and a driving block 22. The main rod body 21 has a first end and a second end. The first end of the main rod body 21 is the end close to the fixed mating cavity, and the second end of the main rod body 21 is the end away from the fixed mating cavity. The driving block 22 is disposed at the first end of the main rod body 21, and a first guide slope 221 is formed on the outer circumferential surface of the driving block 22. A plurality of fixing parts 11 are arranged in a ring with the main rod body 21 as the center, and a second guide slope 111 is formed on the surface of the fixing parts 11 facing the driving block 22. The first driving member can move along a second preset path. During the movement of the first driving member, the first guide slope 221 and the second guide slope 111 are in contact to drive the plurality of fixing parts 11 to move synchronously along the first preset path.

[0042] Multiple fixing parts 11 are connected at one end as a whole, and the other end is a free end. There is a gap between the multiple fixing parts 11. The second preset path is the path along which the pull rod 20 moves along its axis. Through the movement of the pull rod, the first guide sliding slope 221 and the second guide sliding slope 111 slide relative to each other. In this embodiment, the first guide sliding slope 221 and the second guide sliding slope 111 are parallel to each other. When the pull rod moves, the first guide sliding slope 221 and the second guide sliding slope 111 cooperate with each other. The two gradually intersect and generate sliding friction. The interaction between the slopes can convert a small input force into a large lateral thrust, so that the free ends of the multiple fixing parts 11 can expand outward, that is, the fixing parts 11 move along the first preset path, thereby achieving the clamping of the workpiece.

[0043] To allow the first guide slope 221 and the second guide slope 111 to slide relative to each other, see [reference needed]. Figure 1-6 As shown, the clamping device also includes a base 30, and the first driving component includes a driving cylinder 40. Both the fixing component 10 and the driving cylinder 40 are fixedly connected to the base 30. The output end of the driving cylinder 40 is directly or indirectly connected to the second end of the pull rod 20, and the pull rod 20 moves along a second preset path. The base 30 serves as a fixed base, connecting the fixing component 10 and the driving cylinder 40 respectively. The base 30 and the fixing component 10 can be threaded together to facilitate disassembly and replacement of the fixing component 10. A through groove is provided inside the base 30, through which the second end of the pull rod 20 passes and extends to the end of the base 30. The driving cylinder 40 can be directly connected to the second end of the pull rod 20, and its movement drives the pull rod 20 to move along the second preset path. The driving cylinder 40 can also be indirectly connected to the pull rod 20, coordinating with other driving components.

[0044] Further, see Figure 1-3 as well as Figure 7As shown, the drive cylinder 40 has a piston 41, an end cap 42 connected to the piston 41, a first abutment surface 421 on the end cap 42 facing the piston 41, a second abutment surface 411 on the piston 41 facing the first abutment surface 421, and a preset chamber 43 is formed between the first abutment surface 421 and the second abutment surface 411; the first drive member also includes a connecting block 44, which is connected to the second end of the pull rod 20, and a protruding ring 441 is provided on the outer circumferential surface of the connecting block 44, which extends into the preset chamber 43.

[0045] In this embodiment, the output end of the drive cylinder 40 is indirectly connected to the second end of the pull rod 20. Specifically, the convex ring 441 is provided with ball bearings to facilitate the movement of the connecting block 44 by the convex ring 441. The convex ring 441 moves within the preset chamber 43 along with the movement of the piston 41. The drive piston 41 also includes a first air port 45 and a second air port 46. When air is blown into the first air port 45, the piston 41 moves towards the end cover 42, driving the convex ring 441 from the second contact surface 411 towards... When the first contact surface 421 moves, the convex ring 441 is connected to the connecting block 44, and the connecting block 44 is connected to the pull rod 20. Therefore, the pull rod 20 moves in the direction of piston 41, the fixing part 11 is opened, and the fixing part 11 presses against the inner cavity surface of the fixed mating cavity. When air is blown into the second air port 46, the piston 41 moves away from the end cover 42. The end cover 42 drives the convex ring 441 to move from the first contact surface 421 to the second contact surface 411, and then the pull rod 20 is reset.

[0046] To achieve the connection between connecting block 44 and pull rod 20, see... Figure 3 As shown, the connecting block 44 has an internal thread groove 442 along its axial direction, and the second end of the pull rod 20 has an external thread section 23. The external thread section 23 is threaded into the internal thread groove 442, and the threaded connection between the two has a certain degree of adjustability.

[0047] Further, see Figure 1-3 As shown, an adjusting block 50 is provided on the side of the connecting block 44 opposite to the pull rod 20. The adjusting block 50 is used to close the clamping device, increase the sealing of the device, and the adjusting block 50 can also be connected to other equipment to improve the applicability of the device.

[0048] In one possible implementation, see [link to implementation details]. Figure 3-4 and Figure 8As shown, the main rod 21 is provided with a sliding groove 211, which extends along the axial direction of the main rod 21. A limiting rod 31 is provided inside the base 30, with one end connected to the base 30 and the other end extending into the sliding groove 211. During the movement of the pull rod 20, the limiting rod 31 slides within the sliding groove 211, serving as a guide and limiting the range of motion of the pull rod 20, thus ensuring the stability and reliability of the device operation.

[0049] The working principle of the clamping device is as follows: First, the fixing part 10 is placed in the fixed mating cavity of the workpiece. Air is blown into the first air port 45, and the piston 41 moves towards the end cover 42, pushing the convex ring 441 towards the end cover 42. At this time, the connecting block 44 drives the pull rod 20 to move in the direction of piston 41. The first guide sliding slope 221 and the second guide sliding slope 111 are in contact. Under the action of the slope, multiple fixing parts 11 expand outward until they all press against the inner cavity surface of the fixed mating cavity, thereby achieving the clamping of the workpiece. When it is necessary to remove the workpiece, air is blown into the second air port 46, and the piston 41 moves away from the end cover 42. The end cover 42 pushes the convex ring 441 towards the base 30. At this time, the connecting block 44 drives the pull rod 20 to move towards the workpiece. The sliding friction between the first guide sliding slope 221 and the second guide sliding slope 111 gradually disappears, and multiple fixing parts 11 return to the initial position, so that the processed workpiece can be removed.

[0050] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. A clamping device for clamping and fixing a workpiece, the workpiece having a fixed mating cavity, characterized in that, The clamping device comprises: a fixing member having a plurality of fixing portions for extending into the fixing fitting cavity, the fixing portions being movable along a first preset path, and having a preset gap between the fixing portions and the inner cavity surface of the fixing fitting cavity when the fixing portions are located at the initial end of the first preset path, and the fixing portions being pressed against the inner cavity surface of the fixing fitting cavity when the fixing portions are located at the terminal end of the first preset path; a first driving member for driving the plurality of fixing portions to move synchronously along the first preset path; the first driving member comprises a pull rod, the pull rod comprising a main rod body and a driving block, the main rod body having a first end and a second end, the driving block being arranged at the first end of the main rod body, and a first guide sliding inclined surface being formed on the outer circumferential surface of the driving block; the plurality of fixing portions are arranged in a ring shape at intervals around the main rod body, and a second guide sliding inclined surface being formed on the surface of the fixing portions facing the driving block; wherein: the first driving member is movable along a second preset path, and the first guide sliding inclined surface and the second guide sliding inclined surface are fitted together during the movement of the first driving member to drive the plurality of fixing portions to move synchronously along the first preset path; the clamping device further comprises a base, and the first driving member further comprises a driving cylinder, wherein: the fixing member and the driving cylinder are fixedly connected with the base, and the output end of the driving cylinder is directly or indirectly connected with the second end of the pull rod, and the pull rod is movable along the second preset path.

2. The clamping device of claim 1, wherein the driving cylinder has a piston, an end cover is connected to the piston, the end cover has a first abutting surface facing the piston, the piston has a second abutting surface facing the first abutting surface, and a preset chamber is formed between the first abutting surface and the second abutting surface; the first driving member further comprises a connecting block connected to the second end of the pull rod, and a convex ring is protruded on the outer circumferential surface of the connecting block and extends into the preset chamber.

3. The clamping device of claim 2, wherein a female thread groove is arranged in the axial direction of the connecting block, and a male thread segment is arranged at the second end of the pull rod and threadedly fitted into the female thread groove.

4. The clamping device of claim 2, wherein an adjusting block is arranged on the side of the connecting block away from the pull rod.

5. The clamping device of claim 1, wherein a sliding groove is arranged on the main rod body and extends along the axial direction of the main rod body; a limiting rod is arranged in the base, one end of the limiting rod is connected with the base, and the other end of the limiting rod extends into the sliding groove.

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