Reverse positioning clamping tool

Abstract

The utility model discloses a kind of reverse positioning clamping tool, can solve the problem of insufficient workpiece positioning accuracy, especially suitable for complex structure, with irregular curved surface or need multi-station machining workpiece, avoid the reference shift and machining assembly error caused by positive positioning due to workpiece size error, surface roughness etc. The tool includes base, the base both sides are provided with support, and are provided with limiting part, limiting block, compression member and detection part on it. Two groups are oppositely provided to limiting block, and card slot is opened to opposite side wall, and workpiece is clamped into both sides card slot;Limiting part is located between two groups of limiting blocks;Compression member acting end corresponds between two groups of limiting blocks, and workpiece is limited in limiting part;Detection part is arranged on limiting part, and corresponds with workpiece side wall, prevent workpiece installation direction error.

Description

Technical Field

[0001] This utility model relates to the field of positioning fixtures, and in particular to a reverse positioning clamping fixture. Background Technology

[0002] In existing technologies, accurate positioning and stable clamping of workpieces are crucial for ensuring product quality and production efficiency in industrial production fields such as machining and parts assembly. Currently, most workpiece clamping fixtures on the market adopt a forward positioning method, which achieves positioning by directly fitting the outer contour or reference surface of the workpiece with the limiting structure of the fixture, and then relying on manual wrenches, bolts, or simple pneumatic devices for clamping and fixing.

[0003] However, these traditional toolings have several shortcomings in practical applications: First, positioning accuracy is difficult to guarantee. For workpieces with complex structures, irregular curved surfaces, or multi-station machining requirements, forward positioning is easily affected by factors such as the workpiece's own dimensional errors and surface roughness, leading to positioning datum offset and consequently machining or assembly errors. Second, operational convenience is poor. The clamping mechanism of traditional tooling often requires manual adjustment one by one. In batch production scenarios, frequent clamping operations not only increase the labor intensity of workers but also prolong auxiliary production time, hindering the improvement of production efficiency. Third, error prevention capabilities are lacking. When the workpiece has directionality (such as front and back sides, or left and right symmetrical structures), traditional tooling cannot effectively detect the installation direction of the workpiece. If workers mistakenly install it, it may result in the scrapping of the workpiece or even damage to the processing equipment, causing unnecessary economic losses. Fourth, clamping stability is insufficient. The clamping force of some toolings is unevenly distributed, and during processing, factors such as vibration and cutting forces may cause the workpiece to loosen, affecting machining accuracy and even causing safety accidents. Utility Model Content

[0004] This application provides a reverse positioning clamping fixture, which solves the problem of difficulty in guaranteeing positioning accuracy in the prior art. For some workpieces with complex structures, irregular curved surfaces, or multi-station machining requirements, forward positioning is easily affected by factors such as the workpiece's own dimensional errors and surface roughness, leading to positioning datum offset and thus causing machining or assembly errors.

[0005] The technical solutions adopted in the embodiments of this application are as follows.

[0006] A reverse positioning clamping fixture includes a base, legs mounted on the base, limiting members mounted on the base, a workpiece detachable within the limiting members, a limiting block restricting one side of the workpiece, a clamping member restricting the workpiece within the limiting members, and a detection member preventing incorrect installation orientation of the workpiece. The legs are mounted on both sides of the base. Two sets of limiting blocks are arranged opposite each other. Slots are formed on the opposite sidewalls of the limiting blocks. The workpiece is inserted into the slots on both sides. The limiting members are mounted on the base and located between the two sets of limiting blocks. The clamping member is mounted on the base, and its actuating end corresponds to the two sets of limiting blocks. The detection member is mounted on the limiting members and corresponds to the sidewall of the workpiece.

[0007] As a further improvement to the above technical solution: the clamping component includes a cylinder and a clamping plate disposed at the working end of the cylinder; the clamping plate is located between the two sets of limiting blocks; the clamping plate corresponds to the bottom of the workpiece; the cylinder drives the side wall of the workpiece to correspond to the top of the slot, thereby limiting the workpiece.

[0008] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0009] 1. By employing a reverse positioning design, utilizing the interlocking components with the workpiece's internal or non-external reference datum, the influence of workpiece outer contour dimensional errors and surface roughness on positioning, which is present in traditional forward positioning, is avoided. The slots of the limiting blocks constrain the workpiece from both sides, while the clamping components push upwards from the bottom, ensuring a tight fit between the workpiece's sidewall and the top of the slot. This forms a rigid positioning mechanism of "bottom drive - top fit," significantly reducing the risk of positioning datum misalignment. It is particularly suitable for complex workpieces with irregular curved surfaces and multi-station machining requirements. The clamping components use cylinder-driven clamping plates, enabling automatic clamping and loosening of the workpiece without the need for manual adjustment of bolts or wrenches, greatly reducing auxiliary production time. For mass production scenarios, this design reduces worker labor intensity, better matches the clamping rhythm with the production cycle of the processing equipment, and improves overall production line efficiency. The detection component corresponds to the workpiece sidewall, allowing real-time identification of whether the workpiece's installation orientation is correct. When a workpiece is installed in the wrong direction due to misoperation, the detection component can trigger an early warning or prevent the clamping action, avoiding problems such as workpiece scrap and equipment damage caused by incorrect installation in traditional tooling, thus reducing quality risks and economic losses in the production process. The uniform clamping force provided by the cylinder ensures that the workpiece is stably fitted between the slot and the limiting component, forming a multi-directional constraint structure that can effectively resist interference from vibration and cutting forces during processing. Compared with the problem of uneven clamping force distribution in traditional tooling, this structure can reduce the probability of workpiece loosening, ensuring processing accuracy while reducing the risk of safety accidents caused by workpiece displacement. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the reverse positioning clamping fixture in this utility model.

[0011] Figure 2 This is a schematic diagram of the reverse positioning clamping fixture in this utility model.

[0012] In the diagram: 1. Base; 2. Support leg; 3. Limiting component; 4. Workpiece; 5. Limiting block; 51. Slot; 6. Clamping component; 61. Cylinder; 62. Clamping plate; 7. Inspection component. Detailed Implementation

[0013] This application provides a reverse positioning clamping fixture, which solves the problem of difficulty in guaranteeing positioning accuracy in the prior art. For some workpieces with complex structures, irregular curved surfaces, or multi-station machining requirements, forward positioning is easily affected by factors such as the workpiece's own dimensional errors and surface roughness, leading to positioning datum offset and thus causing machining or assembly errors.

[0014] The technical solution in this application embodiment is to solve the above problems, and the overall idea is as follows:

[0015] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0016] A reverse positioning clamping fixture includes a base 1, legs 2 mounted on the base 1, limiting members 3 mounted on the base 1, a workpiece 4 detachably housed within the limiting members 3, a limiting block 5 restricting one side of the workpiece 4, a clamping member 6 that restricts the workpiece 4 within the limiting members 3, and a detection member 7 that prevents incorrect orientation of the workpiece 4 during installation. Legs 2 are provided on both sides of the base 1. Two sets of limiting blocks 5 are arranged opposite each other. Slots 51 are formed on the opposite sidewalls of the limiting blocks 5. The workpiece 4 is inserted into the slots 51 on both sides. The limiting members 3 are mounted on the base 1 and located between the two sets of limiting blocks 5. The clamping member 6 is mounted on the base 1, and its functional end corresponds to the two sets of limiting blocks 5. The detection member 7 is mounted on the limiting members 3 and corresponds to the sidewall of the workpiece 4.

[0017] The clamping component 6 includes a cylinder 61 and a clamping plate 62 disposed at the working end of the cylinder 61; the clamping plate 62 is located between two sets of limiting blocks 5; the clamping plate 62 corresponds to the bottom of the workpiece 4; the cylinder 61 drives the side wall of the workpiece 4 to correspond to the top of the slot 51, thereby limiting the workpiece 4.

[0018] By employing a reverse positioning design, the workpiece 4's internal or non-external reference datum is matched with the limiting component 3, avoiding the influence of workpiece 4's outer contour dimension error and surface roughness on positioning, which is common in traditional forward positioning. The slot 51 of the limiting block 5 constrains the workpiece 4 from both sides, and the clamping component 6 pushes upward from the bottom, making the side wall of the workpiece 4 tightly fit with the top of the slot 51, forming a rigid positioning mechanism of "bottom drive - top fit". This significantly reduces the risk of positioning reference offset, and is especially suitable for complex workpieces 4 with irregular curved surfaces and multi-station processing requirements. The clamping component 6 uses a cylinder 61 to drive the clamping plate 62, which can realize the automatic clamping and loosening of the workpiece 4, eliminating the need for manual adjustment of bolts or wrenches, and greatly reducing auxiliary production time. For batch production scenarios, this design can reduce the labor intensity of workers, make the clamping rhythm more matched with the production rhythm of the processing equipment, and improve the overall production line efficiency. The detection component 7 corresponds to the side wall of the workpiece 4, and can identify in real time whether the installation direction of the workpiece 4 is correct. When workpiece 4 is installed in the wrong direction due to misoperation, the detection component 7 can trigger an early warning or prevent the clamping action, avoiding problems such as workpiece 4 scrapping and equipment damage caused by incorrect installation due to traditional tooling, and reducing quality risks and economic losses in the production process; the uniform clamping force provided by cylinder 61 ensures that workpiece 4 is stably attached between slot 51 and limit component 3, forming a multi-directional constraint structure, which can effectively resist interference such as vibration and cutting force during processing. Compared with the problem of uneven clamping force distribution in traditional tooling, this structure can reduce the probability of workpiece 4 loosening, ensuring processing accuracy and reducing the risk of safety accidents caused by workpiece 4 displacement.

[0019] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0020] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A reverse positioning clamping fixture, characterized in that: Includes a base (1), support legs (2) on the base (1), a limiting member (3) on the base (1), a workpiece (4) detachable within the limiting member (3), a limiting block (5) restricting one side of the workpiece (4), a clamping member (6) limiting the workpiece (4) within the limiting member (3), and a detection member (7) preventing incorrect installation orientation of the workpiece (4); the support legs (2) are provided on both sides of the base (1); two sets of limiting blocks (5) are arranged opposite each other; The limiting block (5) has a slot (51) on its opposite sidewall; the workpiece (4) is inserted into the slot (51) on both sides; the limiting member (3) is set on the base (1) and the limiting member (3) is located between the two sets of limiting blocks (5); the clamping member (6) is set on the base (1) and the working end of the clamping member (6) corresponds to the two sets of limiting blocks (5); the detection member (7) is set on the limiting member (3) and the detection member (7) corresponds to the sidewall of the workpiece (4).

2. The reverse positioning clamping fixture according to claim 1, characterized in that: The clamping component (6) includes a cylinder (61) and a clamping plate (62) disposed at the working end of the cylinder (61); the clamping plate (62) is located between the two sets of limiting blocks (5); the clamping plate (62) corresponds to the bottom of the workpiece (4); the cylinder (61) drives the side wall of the workpiece (4) to correspond to the top of the slot (51), thereby limiting the workpiece (4).

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