Reverse clamping device

Abstract

The utility model discloses a reverse clamping device. The reverse clamping device comprises a positioning plate, an upper support and a lower support, the top face of the positioning plate is connected with an upper support through a pressing piece, the bottom face of the positioning plate is connected with a lower support, the upper support is provided with a clamping arc face used for clamping parts, and the lower support extends downwards to form an operation space located below the positioning plate. A driving part is arranged on the positioning plate, the lower end of the driving part is located in the operation space, and the upper end of the driving part penetrates through the positioning plate and is connected to the pressing part, so that the pressing part ascends and descends up and down and presses or breaks away from the part. According to the reverse clamping device, the part is connected with the reverse clamping device through a part'wrapping 'upper support, so that the inner molded surface of the part is the contact surface of the part and the reverse clamping device, and the problem that the part of a special structure is difficult to clamp is solved. Therefore, the part with the special structure can be effectively fixed, subsequent machining is facilitated, and the machining quality can be guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of tooling fixtures, and in particular relates to a reverse clamping device. Background Art

[0002] Fixtures are often used in the process of mechanical processing. Fixtures are used to fix and position parts, thereby ensuring the processing quality. In the prior art, taking the processing of parts of CNC machine tools as an example, the clamping method of parts is generally to clamp the parts from the outside or from the end face. This clamping method may make the parts unable to be clamped when dealing with some special structural parts. Utility Model Content

[0003] The purpose of the utility model is to provide a reverse clamping device to solve the above problems existing in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A reverse clamping device comprises a positioning plate, an upper support and a lower support;

[0006] The top surface of the positioning plate is connected to the upper support through a clamping piece, and the bottom surface of the positioning plate is connected to the lower support. The upper support is provided with a clamping arc surface for clamping parts, and the lower support extends downward to form an operating space below the positioning plate;

[0007] A driving member is arranged on the positioning plate, the lower end of the driving member is located in the operating space, and the upper end of the driving member passes through the positioning plate and is connected to the pressing member, so that the pressing member can be lifted up and down and press or separate from the parts.

[0008] In a possible design, the positioning plate has a closed side with a plurality of concave avoidance grooves on the side, and a plurality of convex arc steps are provided at the lower part of the side of the positioning plate. The top surfaces of the plurality of arc steps are located on the same circle and form a step surface.

[0009] In a possible design, the upper support is constructed as a platform with the small diameter end at the top and the large diameter end at the bottom, and the side surface of the upper support is constructed as the clamping arc surface. Accordingly, the clamping arc surface is closed and constructed as an elliptical arc surface.

[0010] In a possible design, the clamping member includes a clamping block, a connecting shaft and a connecting screw; the clamping block is located between the positioning plate and the upper support, a plurality of auxiliary avoidance grooves are provided on the clamping block, a plurality of connecting screws are provided and are located on the auxiliary avoidance grooves, the connecting shaft passes through and connects the positioning plate, the clamping block and the upper support, the lower end of the connecting shaft is connected to the driving member, and the connecting screw passes through and connects the positioning plate and the upper support.

[0011] In a possible design, the clamping block includes a base block and a clamping block. The base block is located between the positioning plate and the upper support. A plurality of clamping blocks are provided and are arranged on the side of the base block. The clamping blocks extend outward and extend outside the positioning plate. Accordingly, the portion of the clamping block located outside the positioning plate is used to clamp the parts, and the gap between adjacent clamping blocks forms the secondary avoidance groove.

[0012] In a possible design, a plurality of support blocks are provided on the top surface of the positioning plate, and the connecting screws pass through the support blocks and are plugged into the positioning plate. Accordingly, the support blocks and the connecting screws are provided in a one-to-one correspondence.

[0013] In a possible design, the driving member includes a threaded rod and a driving nut, the threaded rod is connected to the connecting shaft, and the driving nut is sleeved on the threaded rod and located below the positioning plate; accordingly, the upper end of the connecting shaft is connected to the upper support through a positioning pin.

[0014] In one possible design, the lower support includes several support columns.

[0015] Beneficial effects:

[0016] The reverse clamping device connects the part to the reverse clamping device by "wrapping" the upper support with the part, so that the inner surface of the part is the contact surface between the part and the reverse clamping device, thereby solving the problem of difficult clamping of parts with special structures. Therefore, parts with special structures can be effectively fixed, which is convenient for subsequent processing and helps to ensure the quality of processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the structure of a reverse clamping device.

[0018] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure.

[0019] Figure 3 The figure is a schematic diagram of the structure of a reverse clamping device after the parts are installed.

[0020] In the figure:

[0021] 1. Positioning plate; 101. Avoidance groove; 102. Arc step; 103. Support block; 2. Upper support; 201. Clamping arc surface; 3. Lower support; 301. Support column; 4. Clamping member; 410. Clamping block; 411. Base block; 412. Pressing block; 420. Connecting shaft; 430. Connecting screw; 5. Driving member; 501. Threaded rod; 502. Driving nut. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0023] Example:

[0024] like Figure 1-Figure 3 As shown, a reverse clamping device comprises a positioning plate 1, an upper support 2 and a lower support 3;

[0025] The top surface of the positioning plate 1 is connected to the upper support 2 through the clamping member 4, and the bottom surface of the positioning plate 1 is connected to the lower support 3. The upper support 2 is provided with a clamping arc surface 201 for clamping parts, and the lower support 3 extends downward to form an operating space below the positioning plate 1;

[0026] A driving member 5 is provided on the positioning plate 1, the lower end of the driving member 5 is located in the operating space, and the upper end of the driving member 5 passes through the positioning plate 1 and is connected to the clamping member 4, so that the clamping member 4 can be lifted up and down and clamp or release the parts.

[0027] For special parts, such as conical parts, the clamping devices in the prior art all clamp by clamping the outer surface, but the outer surface of the conical part cannot be clamped. In this case, the reverse clamping device is used to fix and then process the parts.

[0028] Specifically, the outer surface of the upper support 2 is constructed as the clamping arc surface 201, and the clamping arc surface 201 is used to achieve the connection between the upper support 2 and the parts. At the same time, the clamping arc surface 201 is preferably provided with a convex part, which further increases the force between the upper support 2 and the parts and improves the fixing effect.

[0029] The positioning plate 1 is used to connect the parts, and also makes the contact part between the parts and the upper support 2 a preset contact surface. At the same time, in order to further improve the fixing effect, a clamping member 4 is provided, and the clamping member 4 applies a force to press the parts to achieve position limiting and fixing, ensuring that the parts will not be disturbed during the processing.

[0030] The lower support 3 supports the positioning plate 1 on the one hand so that the reverse clamping device is at the designed height, and on the other hand, forms an operating space, thereby facilitating the operation of the driving member 5. The driving member 5 is used to control the height of the pressing member 4, and then control the positional relationship between the pressing member 4 and the part, that is, when processing the part, the pressing member 4 moves down and presses the part, and after the processing is completed, the pressing member 4 moves up and releases the part to facilitate the removal of the part.

[0031] Based on this, the reverse clamping device realizes the connection between the part and the reverse clamping device by "wrapping" the upper support 2 by the part, so that the inner surface of the part is the contact surface between the part and the reverse clamping device, thereby solving the problem of difficult clamping of parts with special structures. Therefore, parts with special structures can be effectively fixed, which is convenient for subsequent processing and helps to ensure the quality of processing.

[0032] In this embodiment, the positioning plate 1 has a closed side surface, and a plurality of concave avoidance grooves 101 are provided on the side surface, and a plurality of convex arc steps 102 are provided at the lower part of the side surface of the positioning plate 1, and the top surfaces of the plurality of arc steps 102 are located on the same circumference and constitute a step surface.

[0033] Based on the above design, the parts are moved down and covered on the positioning plate 1, so that the parts are loaded on the positioning plate 1, and the parts are located at the designed position through the connection and limitation of the upper support 2; at the same time, the step surface is used to limit the parts to prevent them from falling. Considering that some parts have an inner convex structure on the inner surface, in order to avoid the inner convex structure interfering with the loading of the parts, an avoidance groove 101 is designed on the positioning plate 1, and the inner convex structure is aligned with the adjacent avoidance groove 101, so that the parts can move down smoothly.

[0034] It is easy to understand that the avoidance grooves 101 are arranged in a one-to-one correspondence with the inner convex structure, that is, the number and position of the avoidance grooves 101 are determined according to the corresponding parts, and the present invention does not impose any limitation on this.

[0035] In this embodiment, the upper support 2 is constructed as a platform with the small diameter end at the top and the large diameter end at the bottom, and the side surface of the upper support 2 is constructed as the clamping arc surface 201. Accordingly, the clamping arc surface 201 is closed and constructed as an elliptical arc surface.

[0036] Based on the above design, the shape of the upper support 2 is adapted to the inner surface of the part, thereby increasing the contact area between the two to ensure the effectiveness of fixation. At the same time, the clamping arc surface 201 is constructed as an elliptical arc surface, and the two ends of the elliptical major diameter are used to achieve clamping, thereby improving the fixing effect.

[0037] Optionally, a weight-reducing hole is provided on the upper support 2. Based on this, the weight is effectively reduced and the convenience of lifting is improved.

[0038] It is easy to understand that the positioning plate 1 and the upper support 2 can be constructed into any suitable shape to adapt to the inner surface of the part.

[0039] In this embodiment, the clamping member 4 includes a clamping block 410, a connecting shaft 420 and a connecting screw 430; the clamping block 410 is located between the positioning plate 1 and the upper support 2, and a plurality of auxiliary avoidance grooves 101 are provided on the clamping block 410, and a plurality of connecting screws 430 are provided and located on the auxiliary avoidance grooves 101, the connecting shaft 420 passes through and connects the positioning plate 1, the clamping block 410 and the upper support 2, the lower end of the connecting shaft 420 is connected to the driving member 5, and the connecting screw 430 passes through and connects the positioning plate 1 and the upper support 2.

[0040] Based on the above design, the clamping block 410 is the working part of the clamping member 4. The clamping block 410 moves downward to clamp the part. Accordingly, the inner surface of the part is provided with a step or a similar platform structure adapted to the clamping block 410. The connecting shaft 420 is used to connect the driving member 5, the clamping member 4, the positioning plate 1 and the upper support 2, so as to input the driving force of the driving member 5 so that the clamping block 410 can be lifted up and down. The connecting screw 430 plays a connecting role on the one hand, and also guides the lifting direction of the upper support 2 on the other hand.

[0041] Preferably, if Figure 1 As shown, the auxiliary avoidance grooves 101 correspond to the avoidance grooves 101 one by one and are aligned to avoid the inner convex structure on the inner surface of the part from pressing the clamping block 410, ensuring that the part can move down smoothly.

[0042] In a possible implementation, the clamping block 410 includes a base block 411 and a clamping block 412. The base block 411 is located between the positioning plate 1 and the upper support 2. A plurality of clamping blocks 412 are provided and are arranged on the side of the base block 411. The clamping blocks 412 extend outward and extend outside the positioning plate 1. Accordingly, the portion of the clamping block 412 located outside the positioning plate 1 is used to clamp parts, and the gap between adjacent clamping blocks 412 forms the secondary avoidance groove 101.

[0043] Based on the above design, the length of the extended portion of the pressing block 412 is controlled to ensure that the pressing block 412 does not block the downward movement of the part and can also effectively press against the step on the inner surface of the part. The base block 411 can be constructed in any suitable shape.

[0044] In a possible implementation, a plurality of support blocks 103 are provided on the top surface of the positioning plate 1 , and the connecting screws 430 pass through the support blocks 103 and are plugged into the positioning plate 1 . Accordingly, the support blocks 103 and the connecting screws 430 are provided in a one-to-one correspondence.

[0045] Based on the above design scheme, a lower limit is formed by multiple support blocks 103 to limit the lower limit position of the upper support 2, and the clamping block 410 moves synchronously with the upper support 2, thereby limiting the lower limit position of the clamping block 410, thereby preventing the clamping block 410 from crushing parts and protecting the parts.

[0046] In this embodiment, the driving member 5 includes a threaded rod 501 and a driving nut 502. The threaded rod 501 is connected to the connecting shaft 420. The driving nut 502 is sleeved on the threaded rod 501 and is located below the positioning plate 1. Accordingly, the upper end of the connecting shaft 420 is connected to the upper support 2 through a positioning pin.

[0047] Based on the above design, by turning the driving nut 502, the threaded rod 501 rotates and moves up and down through the thread, and the connecting shaft 420 also moves up and down, so that the pressing member 4 moves up and down synchronously. The driving member 5 has the advantages of simple structure and convenient operation.

[0048] In this embodiment, the lower support 3 includes a plurality of support columns 301. Based on the above design, the support columns 301 can be selected in any suitable number and arranged at any suitable position, and the support columns 301 can be selected from any suitable commercially available models.

[0049] When the reverse clamping device is working, the part moves downward until the inner surface of the part contacts and is supported by the upper support 2. At this time, the lower end cover of the part is set on the positioning plate 1; the driving nut 502 is turned to move the clamping block 410 downward, so that the clamping block 412 clamps the part; after the part processing is completed, the driving nut 502 is turned to move the clamping block 410 upward, and the clamping block 412 is separated from the part, and the part can be removed at this time.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reverse clamping device, characterized in that: It comprises a positioning plate (1), an upper support (2) and a lower support (3); The top surface of the positioning plate (1) is connected to the upper support (2) via a clamping member (4), the bottom surface of the positioning plate (1) is connected to the lower support (3), the upper support (2) is provided with a clamping arc surface (201) for clamping parts, and the lower support (3) extends downward to form an operating space located below the positioning plate (1); A driving member (5) is provided on the positioning plate (1), the lower end of the driving member (5) is located in the operating space, and the upper end of the driving member (5) passes through the positioning plate (1) and is connected to the pressing member (4), so that the pressing member (4) can be lifted up and down and press or release the parts.

2. The reverse clamping device according to claim 1, characterized in that: The positioning plate (1) has a closed side surface, and a plurality of inwardly concave avoidance grooves (101) are provided on the side surface. A plurality of outwardly convex arc-shaped steps (102) are provided at the lower part of the side surface of the positioning plate (1). The top surfaces of the plurality of arc-shaped steps (102) are located on the same circumference and form a step surface.

3. The reverse clamping device according to claim 1, characterized in that: The upper support (2) is constructed as a platform with the small diameter end at the top and the large diameter end at the bottom. The side surface of the upper support (2) is constructed as the clamping arc surface (201). Accordingly, the clamping arc surface (201) is closed and constructed as an elliptical arc surface.

4. The reverse clamping device according to claim 1, characterized in that: The pressing member (4) comprises a pressing block (410), a connecting shaft (420) and a connecting screw (430); the pressing block (410) is located between the positioning plate (1) and the upper support (2); a plurality of auxiliary avoidance grooves (101) are provided on the pressing block (410); a plurality of connecting screws (430) are provided and are located on the auxiliary avoidance grooves (101); the connecting shaft (420) passes through and connects the positioning plate (1), the pressing block (410) and the upper support (2); the lower end of the connecting shaft (420) is connected to the driving member (5); and the connecting screw (430) passes through and connects the positioning plate (1) and the upper support (2).

5. The reverse clamping device according to claim 4, characterized in that: The pressing block (410) comprises a base block (411) and a pressing block (412); the base block (411) is located between the positioning plate (1) and the upper support (2); a plurality of pressing blocks (412) are provided and are arranged on the side of the base block (411); the pressing blocks (412) extend outward and extend outside the positioning plate (1); accordingly, the portion of the pressing block (412) located outside the positioning plate (1) is used to press parts; the gap between adjacent pressing blocks (412) forms the auxiliary avoidance groove (101).

6. The reverse clamping device according to claim 4, characterized in that: A plurality of support blocks (103) are arranged on the top surface of the positioning plate (1), and the connecting screws (430) pass through the support blocks (103) and are plugged into the positioning plate (1). Accordingly, the support blocks (103) and the connecting screws (430) are arranged in a one-to-one correspondence.

7. The reverse clamping device according to claim 1, characterized in that: The driving member (5) comprises a threaded rod (501) and a driving nut (502), wherein the threaded rod (501) is connected to the connecting shaft (420), and the driving nut (502) is sleeved on the threaded rod (501) and is located below the positioning plate (1); accordingly, the upper end of the connecting shaft (420) is connected to the upper support (2) via a positioning pin.

8. The reverse clamping device according to claim 1, characterized in that: The lower support (3) comprises a plurality of support columns (301).

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