Multi-point-position self-centering clamp

Abstract

The utility model discloses a multi-point self-centering clamp, which belongs to the technical field of clamps and comprises a bottom plate. A first fixing mechanism is mounted on the left side of the bottom plate, and two through grooves are formed in the left side of the bottom plate; the first fixing mechanism comprises a pressing assembly and fixing assemblies used for pre-pressing a blank workpiece, the pressing assembly is installed on the bottom plate, and the two fixing assemblies are installed on the bottom plate; the two fixing assemblies are symmetrically distributed on the two sides of the pressing assembly. The right side of the bottom plate is provided with two sets of second fixing mechanisms used for clamping the blank workpieces subjected to primary treatment. In this way, the fixing assemblies position and pre-press the blank workpieces, and then the blank workpieces in the two fixing assemblies are synchronously pressed through the pressing assemblies; the blank workpiece is positioned and clamped through the second fixing mechanism after being primarily machined; and through cooperation of the first fixing mechanism and the second fixing mechanism, comprehensive machining of the blank workpiece is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a multi-point self-centering clamp. Background Art

[0002] When some workpieces are being processed such as drilling or cutting, they need to be fixed by fixtures to prevent them from moving during processing. To ensure processing efficiency and accuracy, the fixture should be fast, convenient, safe and precise so that the workpiece is in the correct position during processing.

[0003] For example, Chinese patent CN2 1 6326722U discloses a multi-point positioning clamping fixture, which is provided with a base, a support column, a rotating shaft, a clamping claw, a support seat, a fastening screw and a clamping plate, and multiple points of a workpiece are clamped and fixed by the cooperation of various components.

[0004] However, there is a workpiece on the market with a slotted hole at the bottom, and its outer shape has a draft angle. If the slotted hole is not properly utilized, it is difficult to accurately position and press it, thus affecting the processing accuracy.

[0005] Based on this, the utility model designs a multi-point self-centering fixture to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a multi-point self-centering clamp.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A multi-point self-centering fixture includes a base plate;

[0009] A first fixing mechanism is installed on the left side of the bottom plate, and two through slots are provided on the left side of the bottom plate; the first fixing mechanism includes a clamping assembly and a fixing assembly for pre-pressing the blank workpiece, the clamping assembly is installed on the bottom plate, and two sets of fixing assemblies are installed on the bottom plate; the two sets of fixing assemblies are symmetrically distributed on both sides of the clamping assembly;

[0010] Two sets of second fixing mechanisms for clamping the semi-finished workpieces after preliminary processing are installed on the right side of the bottom plate.

[0011] Furthermore, the fixing assembly is composed of two groups of pre-pressing assemblies which are symmetrically installed front and back; the two groups of pre-pressing assemblies are symmetrically distributed at both ends of the through slot.

[0012] Furthermore, the pre-pressing assembly includes a support platform, a positioning block, a first oil cylinder and a pressure block. The first oil cylinder and the support platform for supporting the end of the blank workpiece are fixedly installed on the base plate. The positioning block plugged into the positioning groove is fixedly installed on the support platform. The first oil cylinder is located on the side of the support platform close to the edge of the base plate; a pressure block is fixedly installed on the output end of the first oil cylinder.

[0013] Furthermore, the fixing assembly also includes an appearance error-proofing block, which is fixedly mounted on the base plate, and the two appearance error-proofing blocks are symmetrically distributed on both sides of the first oil cylinder.

[0014] Furthermore, the clamping assembly includes a second oil cylinder and a first clamping block. The second oil cylinder is fixedly mounted on the bottom plate, and the first clamping block is fixedly mounted on the output end of the second oil cylinder.

[0015] Furthermore, the second fixing mechanism includes a positioning component and a fastening component, and the positioning component and the fastening component are installed on the base plate.

[0016] Furthermore, the positioning assembly includes a first support platform, a second support platform, an anti-error pin and a positioning pin. The first support platform and the second support platform are fixedly installed on the right side of the base plate for supporting the two ends of the semi-finished workpiece respectively. The first support platform is fixedly installed with a positioning pin that is plugged into the positioning groove; multiple anti-error pins are fixedly installed on the base plate; the anti-error pin is located at the edge of the semi-finished workpiece.

[0017] Furthermore, the fastening assembly includes a single-acting cylinder, a push block, a third oil cylinder and a second clamping block. The single-acting cylinder is fixedly mounted on the base plate, and the push block is fixedly mounted on the output end of the single-acting cylinder; two third oil cylinders are fixedly mounted on the base plate, and the two third oil cylinders are symmetrically distributed on the left and right sides of the semi-finished workpiece; and the second clamping block is fixedly mounted on the output end of the third oil cylinder.

[0018] The utility model has the following technical effects:

[0019] 1. The utility model places the blank workpiece on the fixing assembly, positions and pre-presses the blank workpiece through the fixing assembly, and then synchronously presses the blank workpieces in the two groups of fixing assemblies through the clamping assembly; the fixing assembly does not block the upper surface of the blank workpiece to be processed; the through groove is used to prevent the bottom plate from blocking the lower surface of the blank workpiece to be processed; thus, after the blank workpiece is fixed, it is convenient to process the upper and lower surfaces of the blank workpiece; after the blank workpiece is initially processed, the clamping assembly and the fixing assembly are reset, and the blank workpiece after the initial processing is placed on the second fixing mechanism, and the blank workpiece is positioned and clamped by the second fixing mechanism, and the second fixing mechanism does not block the two ends of the blank workpiece, so that the forging blank workpiece is accurately clamped, the workpiece is located in the correct position, and the processing accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The utility model is a three-dimensional multi-point self-centering clamp Figure 1 ;

[0022] Figure 2 It is a top view of a multi-point self-centering fixture of the utility model;

[0023] Figure 3 The utility model is a three-dimensional multi-point self-centering clamp Figure 2 ;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 Schematic diagram of the workpiece structure.

[0026] The numbers in the figure represent:

[0027] 1. Bottom plate; 3. First fixing mechanism; 31. Fixing assembly; 311. Support platform; 312. Positioning block; 313. Shape error prevention block; 314. First oil cylinder; 315. Pressing block; 32. Clamping assembly; 321. Second oil cylinder; 322. First clamping block; 4. Second fixing mechanism; 41. First support platform; 42. Second support platform; 43. Error prevention pin; 44. Positioning pin; 45. Single-acting cylinder; 46. Pushing block; 47. Third oil cylinder; 48. Second clamping block; 5. Rough workpiece; 51. Positioning groove; 6. Through groove; 7. Semi-finished workpiece. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model is further described below in conjunction with embodiments.

[0030] Example 1

[0031] Please refer to the instruction manual Figure 1-2 , a multi-point self-centering fixture, comprising a base plate 1;

[0032] The first fixing mechanism 3 is installed on the left side of the bottom plate 1, and two through slots 6 are provided on the left side of the bottom plate 1; the first fixing mechanism 3 includes a clamping assembly 32 and a fixing assembly 31 for pre-pressing the blank workpiece 5, the clamping assembly 32 is installed on the bottom plate 1, and two groups of fixing assemblies 31 are installed on the bottom plate 1; the two groups of fixing assemblies 31 are symmetrically distributed on both sides of the clamping assembly 32;

[0033] Two sets of second fixing mechanisms 4 for clamping the semi-finished workpiece 7 after preliminary processing are installed on the right side of the base plate 1.

[0034] In this embodiment, when the multi-point self-centering fixture works normally, the blank workpiece 5 is placed on the fixing component 31, the blank workpiece 5 is positioned and pre-pressed by the fixing component 31, and then the blank workpiece 5 in the two groups of fixing components 31 are synchronously pressed by the clamping component 32; the fixing component 31 does not block the upper surface of the blank workpiece 5 to be processed; the through groove 6 is used to prevent the bottom plate 1 from blocking the lower surface of the blank workpiece 5 to be processed; thus, after the blank workpiece 5 is fixed, it is convenient to process the upper and lower surfaces of the blank workpiece 5; the blank workpiece 5 becomes a semi-finished workpiece 7 after preliminary processing; the clamping component 32 and the fixing component 31 are reset, and the semi-finished workpiece 7 after preliminary processing is placed on the second fixing mechanism 4, and the semi-finished workpiece 7 is positioned and clamped by the second fixing mechanism 4, and the second fixing mechanism 4 does not block the two ends of the semi-finished workpiece 7, so that it is convenient to process the two ends of the semi-finished workpiece 7.

[0035] Example 2

[0036] like Figure 1-5 As shown, as a preferred embodiment of the utility model, the fixing assembly 31 is composed of two groups of pre-pressing assemblies symmetrically installed front and back; the two groups of pre-pressing assemblies are symmetrically distributed at both ends of the through slot 6;

[0037] The pre-pressing assembly includes a support platform 311, a positioning block 312, a first oil cylinder 314 and a pressing block 315. The first oil cylinder 314 and the support platform 311 for supporting the end of the rough workpiece 5 are fixedly installed on the bottom plate 1. The positioning block 312 plugged into the positioning groove 51 is fixedly installed on the support platform 311. The first oil cylinder 314 is located on one side of the support platform 311 close to the edge of the bottom plate 1; the pressing block 315 is fixedly installed on the output end of the first oil cylinder 314;

[0038] The fixing assembly 31 further includes an outer shape error-proofing block 313, which is fixedly mounted on the bottom plate 1, and two outer shape error-proofing blocks 313 are symmetrically distributed on both sides of the first oil cylinder 314;

[0039] The clamping assembly 32 includes a second oil cylinder 321 and a first clamping block 322 . The second oil cylinder 321 is fixedly mounted on the bottom plate 1 , and the first clamping block 322 is fixedly mounted on the output end of the second oil cylinder 321 .

[0040] The second fixing mechanism 4 includes a positioning component and a fastening component, and the positioning component and the fastening component are installed on the base plate 1;

[0041] The positioning assembly includes a first support platform 41, a second support platform 42, an anti-error pin 43 and a positioning pin 44. The first support platform 41 and the second support platform 42 are fixedly installed on the right side of the bottom plate 1 to support the two ends of the semi-finished workpiece 7 respectively. The first support platform 41 is fixedly installed with a positioning pin 44 plugged into the positioning groove 51 at the bottom of the semi-finished workpiece 7; a plurality of anti-error pins 43 are fixedly installed on the bottom plate 1; the anti-error pins 43 are located at the edge of the semi-finished workpiece 7;

[0042] The fastening assembly includes a single-acting cylinder 45, a push block 46, a third oil cylinder 47 and a second pressing block 48. The single-acting cylinder 45 is fixedly mounted on the bottom plate 1, and the push block 46 is fixedly mounted on the output end of the single-acting cylinder 45; two third oil cylinders 47 are fixedly mounted on the bottom plate 1, and the two third oil cylinders 47 are symmetrically distributed on the left and right sides of the semi-finished workpiece 7; and the second pressing block 48 is fixedly mounted on the output end of the third oil cylinder 47;

[0043] The bottom plate 1 is also provided with an airtight detection module for detecting whether the first pressing block 322 and the second pressing block 48 are in place. The airtight detection module adopts mature technology in the market in this field.

[0044] In this embodiment, when the first fixing mechanism 3 and the second fixing mechanism 4 are working normally, the positioning groove 51 at the bottom of the rough workpiece 5 is aligned with the positioning block 312 on the support platform 311, and the rough workpiece 5 is placed on the support platform 311; the support platform 311 supports the rough workpiece 5, and the positioning block 312 positions the rough workpiece 5; the side of the rough workpiece 5 is limited by the shape anti-error block 313, and the two ends of the rough workpiece 5 are prevented from being placed in the opposite direction; thereby realizing automatic centering of the rough workpiece 5; the first oil cylinder 314 drives the pressure block 315 to rotate and press down to pre-press the rough workpiece 5; then the second oil cylinder 321 is started to drive the first clamping block 322 to rotate and press down, and the two rough workpieces 5 are synchronously clamped by the first clamping block 322; after preliminary processing of the upper and lower surfaces of the rough workpiece 5, the second oil cylinder 321 drives the first clamping block 322 to reset, and the first oil cylinder 314 drives the pressure block 315 Reset; then place the semi-finished workpiece 7 after preliminary processing on the first support platform 41 and the second support platform 42; position the semi-finished workpiece 7 through the positioning pin 44, and prevent the semi-finished workpiece 7 from being placed in the opposite direction through the anti-error pin 43; then the single-acting cylinder 45 pushes the push block 46 to move, and the side of the semi-finished workpiece 7 is positioned and pressed by the push block 46; the third oil cylinder 47 drives the second clamping block 48 to rotate and press down to clamp the semi-finished workpiece 7; thereby facilitating the processing of both ends of the semi-finished workpiece 7; after the processing is completed, the third oil cylinder 47 drives the second clamping block 48 to reset, and the single-acting cylinder 45 drives the push block 46 to reset, and then the semi-finished workpiece 7 is taken out; in this process, the second clamping block 48 and the first clamping block 322 are detected in place and reset through the fixture airtight detection module installed on the base plate 1, and an alarm is issued in time when the second clamping block 48 and the first clamping block 322 are not in place to avoid damage.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-point self-centering fixture, comprising a base plate (1), characterized in that: A first fixing mechanism (3) is installed on the left side of the base plate (1), and two through slots (6) are provided on the left side of the base plate (1); the first fixing mechanism (3) comprises a clamping assembly (32) and a fixing assembly (31) for pre-pressing the blank workpiece (5); the clamping assembly (32) is installed on the base plate (1), and two groups of fixing assemblies (31) are installed on the base plate (1); the two groups of fixing assemblies (31) are symmetrically distributed on both sides of the clamping assembly (32); Two sets of second fixing mechanisms (4) for clamping the semi-finished workpiece (7) after preliminary processing are installed on the right side of the bottom plate (1).

2. The multi-point self-centering fixture according to claim 1, characterized in that: The fixing assembly (31) is composed of two groups of pre-pressing assemblies which are symmetrically installed front and back; the two groups of pre-pressing assemblies are symmetrically distributed at both ends of the through slot (6).

3. The multi-point self-centering fixture according to claim 2, characterized in that: The pre-pressing assembly comprises a support platform (311), a positioning block (312), a first oil cylinder (314) and a pressing block (315); the first oil cylinder (314) and the support platform (311) for supporting the end of the rough workpiece (5) are fixedly mounted on the bottom plate (1); the positioning block (312) plugged into the positioning groove (51) is fixedly mounted on the support platform (311); the first oil cylinder (314) is located on one side of the support platform (311) close to the edge of the bottom plate (1); and the pressing block (315) is fixedly mounted on the output end of the first oil cylinder (314).

4. The multi-point self-centering fixture according to claim 3, characterized in that: The fixing assembly (31) further comprises an outer shape error-proofing block (313), which is fixedly mounted on the bottom plate (1), and the two outer shape error-proofing blocks (313) are symmetrically distributed on both sides of the first oil cylinder (314).

5. The multi-point self-centering fixture according to claim 4, characterized in that: The clamping assembly (32) comprises a second oil cylinder (321) and a first clamping block (322); the second oil cylinder (321) is fixedly mounted on the base plate (1); and the first clamping block (322) is fixedly mounted on the output end of the second oil cylinder (321).

6. The multi-point self-centering fixture according to claim 5, characterized in that: The second fixing mechanism (4) comprises a positioning component and a fastening component, and the positioning component and the fastening component are mounted on the base plate (1).

7. The multi-point self-centering fixture according to claim 6, characterized in that: The positioning assembly comprises a first support platform (41), a second support platform (42), an anti-error pin (43) and a positioning pin (44); the first support platform (41) and the second support platform (42) are fixedly mounted on the right side of the base plate (1) for supporting the two ends of the semi-finished workpiece (7) respectively; the first support platform (41) is fixedly mounted with a positioning pin (44) plugged into the positioning groove (51); a plurality of anti-error pins (43) are fixedly mounted on the base plate (1); and the anti-error pins (43) are located at the edge of the semi-finished workpiece (7).

8. The multi-point self-centering fixture according to claim 7, characterized in that: The fastening assembly comprises a single-acting cylinder (45), a push block (46), a third oil cylinder (47) and a second pressing block (48); the single-acting cylinder (45) is fixedly mounted on a base plate (1); the push block (46) is fixedly mounted on the output end of the single-acting cylinder (45); two third oil cylinders (47) are fixedly mounted on the base plate (1); the two third oil cylinders (47) are symmetrically distributed on the left and right sides of the semi-finished workpiece (7); and the second pressing block (48) is fixedly mounted on the output end of the third oil cylinder (47).

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