Position-limiting detection tool for preventing product from being deformed by positive pressure

Abstract

This utility model discloses a limiting detection fixture for preventing product deformation under positive pressure, relating to the field of automotive parts testing. It includes multiple sets of parallel product limiting units, each set consisting of parallel limiting clamps (first and second). Both limiting clamps in each set can open and close. When limiting clamps are closed, they form a space to accommodate the product. Based on the combination of multiple product limiting units, this utility model allows for simultaneous testing of multiple products, improving testing efficiency. Simultaneously, it prevents product deformation and bulging caused by multiple products being unable to withstand high pressure after positive pressure filling in a vacuum chamber, ensuring the stability of the vacuum chamber's interior. During product positioning, manual installation of sealing elements is unnecessary, offering automation and improving the efficiency of helium leak detection.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts testing, and in particular to a limit testing fixture for preventing product deformation under positive pressure. Background Technology

[0002] Helium leak detection is a highly sensitive non-destructive leak detection method. Its core principle involves placing the test piece in a sealed vacuum chamber, applying helium gas inside the product, and using a helium mass spectrometer to detect any helium leaking into the vacuum chamber. During the detection process, the product needs to be filled with pure helium to a predetermined concentration and maintained in a helium environment. Then, the helium mass spectrometer is activated and monitored continuously for a certain period. If the helium mass spectrometer reading continuously rises and exceeds a threshold, a leak is determined to exist. A weak reading that stabilizes at the background level is considered acceptable.

[0003] Existing vacuum chambers used for helium leak detection of automotive battery liquid cooling plates typically only allow for the testing of one product at a time. If multiple products need to be tested, to prevent deformation or bulging due to the pressure after positive pressure filling, additional product positioning fixtures are required to hold the products in place. Therefore, the positioning fixtures must be operated sequentially when placing multiple products, which is time-consuming and reduces testing efficiency. Utility Model Content

[0004] To address the aforementioned issues, this application provides a limit detection fixture for preventing product deformation under positive pressure.

[0005] To achieve the above objectives, this application provides the following technical solution: a limit detection fixture for preventing product deformation under positive pressure, comprising multiple sets of parallel product limit units, each set of product limit units consisting of a first limit clamp and a second limit clamp, both of which can be opened and closed. When the first limit clamp and the second limit clamp are in a closed state, a space is formed that can accommodate the product.

[0006] The first and second limiting clamps are respectively provided with a linkage frame and a docking frame at both ends. The linkage frame and the docking frame are respectively provided with a first sealing joint and a second sealing joint on opposite sides. When the first and second limiting clamps are closed, the linkage frame and the docking frame are located on both sides of the product, and the first sealing joint and the second sealing joint abut against the through hole of the product.

[0007] Furthermore, the docking frame is provided with a limiting rod, the linkage frame is slidably connected to the limiting rod, and a return spring is fixed on the side of the linkage frame away from the docking frame. An anti-detachment block is fixed on the other end of the return spring. The anti-detachment block is installed on the end of the limiting rod away from the docking frame. When the first limiting clamp moves and closes with the second limiting clamp, the linkage frame moves toward the docking frame, and the return spring expands until the first sealing joint and the second sealing joint abut against the through hole of the product.

[0008] Furthermore, multiple parallel support frames are provided below the first and second limiting clamps. The front ends of the support frames are fixed by connecting frames, and multiple linear guide rods are fixed on the connecting frames.

[0009] Multiple first sliding blocks are fixedly installed at the bottom end of each limiting clamp plate one, and multiple second sliding blocks are installed at the bottom end of each limiting clamp plate two. The first sliding blocks and the second sliding blocks are slidably connected to the linear guide rod.

[0010] Furthermore, the limiting clamps 2 and 1 in the two adjacent sets of product limiting units are connected by a connecting frame. The first sliding blocks at the bottom of the limiting clamps 1 in the two adjacent sets of product limiting units are connected by a first pressure spring, and the second sliding blocks at the bottom of the limiting clamps 2 are connected by a second pressure spring. When the limiting clamps 1 in the front product limiting unit moves and closes with the limiting clamps 2, as the limiting clamps 1 continues to move, the limiting clamps 2, the connecting frame and the limiting clamps 1 in the rear product limiting unit move synchronously. The limiting clamps 1 and 2 in the rear product limiting unit close one after another, and the first pressure spring and the second pressure spring contract one after another until multiple sets of product limiting units close together.

[0011] Furthermore, the rear end of the support frame is fixed by an interceptor plate. When the first and second limit plates in the multiple product limit units are closed, the second limit plate in the product limit unit located at the tail end abuts against the interceptor plate.

[0012] In summary, the technical effects and advantages of this utility model are as follows:

[0013] This invention, based on a combination of multiple product limiting units, allows for simultaneous testing of multiple products, improving testing efficiency. Simultaneously, it prevents product deformation and bulging that can occur when multiple products in a vacuum chamber are subjected to positive pressure filling, ensuring the stability of the chamber's interior. Furthermore, the product positioning process eliminates the need for manual installation of sealing elements, offering automation and enhancing the efficiency of helium leak detection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the second perspective structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the third-view structure of this utility model.

[0018] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0019] Figure 5 This is a schematic diagram of the connection structure between the first limiting clamp and the second limiting clamp of this utility model.

[0020] Figure 6 This is a schematic diagram of the connection structure between the first limiting clamp and the second limiting clamp of this utility model from a second perspective.

[0021] Figure 7 This utility model Figure 6 Enlarged structural diagram of section B.

[0022] In the diagram: 1. Limiting clamp one; 2. Limiting clamp two; 3. Connecting frame; 4. Support frame; 5. Connecting frame; 6. Linear guide rod; 7. Intercepting plate; 8. First pressure spring; 9. Second pressure spring; 101. First sliding block; 102. Linkage frame; 103. First sealing joint; 104. Return spring; 201. Second sliding block; 202. Connecting frame; 203. Second sealing joint; 204. Limiting rod; 205. Anti-detachment block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: Reference Figure 1 , Figure 2A limit detection tooling for preventing the positive pressure deformation of products is shown. This limit detection tooling is applied to a vacuum chamber for helium leak detection of products. The limit detection tooling includes multiple groups of product limit units distributed in parallel. Each group of product limit units consists of a limit clamping plate 1 and a limit clamping plate 2 distributed in parallel, and the limit clamping plate 1 and the limit clamping plate 2 in each group of limit units can move in an opening and closing manner. When the limit clamping plate 1 and the limit clamping plate 2 are in a closed state, a space for accommodating the product is formed, and the product is placed vertically in this space.

[0025] Subsequently, during the process of helium leak detection operation, helium with a set pressure and concentration needs to be filled into the product. During the detection process, if the product contains leakage points, helium molecules can fully diffuse to the periphery of the leakage point. Therefore, during the detection process, the helium mass spectrometer needs to be started, the detection parameters are set, and continuous monitoring is carried out for 2 - 5 minutes. If the reading of the helium mass spectrometer continuously rises and exceeds the threshold, it is determined that there is a leak. If the reading stabilizes at the background level, it is determined to be qualified.

[0026] During the process of detecting the product, based on the combined setting of multiple product limit units, multiple products can be detected simultaneously, which improves the efficiency of the detection work. At the same time, it can also avoid the deformation, bulging and other bad phenomena of the products in the vacuum chamber that cannot withstand the high pressure after positive pressure filling, ensuring the stable state inside the vacuum chamber and effectively avoiding the collision and deformation of the products during the detection process.

[0027] Furthermore, as Figure 3 、 Figure 4 shown, linkage frames 102 and docking frames 202 are respectively provided at both ends of the limit clamping plate 1 and the limit clamping plate 2. First sealing joints 103 and second sealing joints 203 are respectively provided on the opposite sides of the linkage frames 102 and the docking frames 202. When the limit clamping plate 1 and the limit clamping plate 2 are closed, the linkage frames 102 and the docking frames 202 are respectively located on both sides of the product, and the first sealing joint 103 and the second sealing joint 203 abut against the through holes of the product. The combined setting of the first sealing joint 103 and the second sealing joint 203 has a positioning effect on the product to be detected, and at the same time can maintain the sealing performance of the product to be detected, avoid leakage at the through hole position of the product, reduce the error of the leak detection operation, and improve the accuracy of the detection work.

[0028] Furthermore, as Figure 3 、 Figure 4As shown, the docking frame 202 is provided with a limiting rod 204, the linkage frame 102 is slidably connected to the limiting rod 204, and a return spring 104 is fixed on the side of the linkage frame 102 away from the docking frame 202. An anti-detachment block 205 is fixed on the other end of the return spring 104. The anti-detachment block 205 is installed on the end of the limiting rod 204 away from the docking frame 202. When the first limiting clamp 1 moves and closes with the second limiting clamp 2, the linkage frame 102 moves toward the docking frame 202, and the return spring 104 expands until the first sealing joint 103 and the second sealing joint 203 abut against the through hole of the product.

[0029] During this process, the linkage frame 102 can reduce the distance between itself and the docking frame 202 as the limiting clamp 1 moves, so that the first sealing joint 103 and the second sealing joint 203 can be simultaneously aligned with the through hole of the product. Therefore, during the helium leak detection operation of the product, after the product limiting unit is closed and docked with the product, there is no need to manually install the sealing element, which improves the portability of operation. The whole process has the advantage of automation and improves the efficiency of the helium leak detection operation of the product.

[0030] After the helium leak detection operation is completed, the linkage frame 102 can increase the distance between itself and the docking frame 202 as the limit clamp 1 resets. The reset spring 104 can increase the reset speed of the linkage frame 102, thereby allowing the first sealing joint 103 to quickly detach from the product, so that the product can be removed later.

[0031] like Figure 2 , Figure 3 As shown, multiple parallel support frames 4 are provided below the first limiting clamp 1 and the second limiting clamp 2. The front ends of the support frames 4 are fixed to each other by connecting frames 5, and multiple linear guide rods 6 are fixed on the connecting frames 5. Multiple first sliding blocks 101 are fixedly installed at the bottom of the first limiting clamp 1, and multiple second sliding blocks 201 are installed at the bottom of the second limiting clamp 2. The first sliding blocks 101 and the second sliding blocks 201 are slidably connected to the linear guide rods 6. Therefore, when the first limiting clamp 1 and the second limiting clamp 2 in the product limiting unit move, they move along a straight path, improving the docking accuracy of the product limiting unit.

[0032] Example 2: Based on Example 1, such as Figure 5-7As shown, the multiple sets of product limiting units in this utility model are arranged from front to back inside the vacuum chamber. The limiting clamps 2 and 1 in adjacent sets of product limiting units are connected by a connecting frame 3. The first sliding blocks 101 at the bottom of the limiting clamps 1 in adjacent sets of product limiting units are connected by a first pressure spring 8, and the second sliding blocks 201 at the bottom of the limiting clamps 2 are connected by a second pressure spring 9. Therefore, when the limiting clamp 1 in the front product limiting unit moves and closes with the limiting clamp 2, the limiting clamp 2, the connecting frame 3, and the limiting clamp 1 in the rear product limiting unit move synchronously with the continuous movement of the limiting clamp 1. Subsequently, the limiting clamps 1 and 2 in the rear product limiting unit close successively.

[0033] Therefore, by simply issuing a driving command to the first limiting plate 1 in the product limiting unit at the very beginning, causing it to move along a straight path, the first limiting plate 1 and the second limiting plate 2 in the subsequent product limiting units will close successively. This will cause the first pressure spring 8, which is connected in series with the first sliding block 101 distributed from front to back, and the second pressure spring 9, which is connected in series with the second sliding block 201 distributed from front to back, to contract successively, until multiple sets of product limiting units are completely closed. In this process, the synchronous high-speed linear positioning eliminates the need to operate each product limiting unit individually, improving the efficiency of the positioning work and also enhancing the portability during the operation of the product limiting units.

[0034] After the helium leak detection operation is completed, the driving command is applied again to the limiting clamp 1 in the product limiting unit at the very beginning, so that it moves and resets along a straight path. Under the elastic potential energy of the first pressure spring 8 and the second pressure spring 9, the limiting clamp 1 and the limiting clamp 2 in multiple sets of product limiting units can be reset one after another, releasing the positioning connection of the product, so as to remove the product and carry out subsequent transfer operations.

[0035] It is worth mentioning that in this application, the limiting clamp 1 in the product limiting unit at the very front end is connected to the driving element installed on the outside of the vacuum chamber. The driving element can be a pneumatic component or other linear driving element widely used in the prior art, which will not be described in detail here.

[0036] like Figure 1 , Figure 2 As shown, to ensure the smooth closure of the limiting clamps 1 and 2 in the multiple product limiting units and to prevent the product limiting units from detaching from the support frame 4, the rear end of the support frame 4 is fixed by an intercepting plate 7. When the limiting clamps 1 and 2 in the multiple product limiting units are closed, the limiting clamp 2 in the product limiting unit located at the tail end abuts against the intercepting plate 7.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A limit detection tool for preventing positive deformation of a product, characterized by: It includes multiple sets of parallel product limiting units. Each set of product limiting units is composed of parallel limiting clamps 1 (1) and limiting clamps 2 (2). The limiting clamps 1 (1) and limiting clamps 2 (2) in each set of limiting units can open and close. When the limiting clamps 1 (1) and limiting clamps 2 (2) are in a closed state, a space that can accommodate the product is formed. The two ends of the first limiting clamp (1) and the second limiting clamp (2) are respectively provided with a linkage frame (102) and a docking frame (202). The opposite sides of the linkage frame (102) and the docking frame (202) are respectively provided with a first sealing joint (103) and a second sealing joint (203). When the first limiting clamp (1) and the second limiting clamp (2) are closed, the linkage frame (102) and the docking frame (202) are located on both sides of the product, and the first sealing joint (103) and the second sealing joint (203) abut against the through hole of the product.

2. The limit detection tool for preventing the product from being deformed by positive pressure according to claim 1, wherein: The docking frame (202) is provided with a limiting rod (204). The linkage frame (102) is slidably connected to the limiting rod (204). A return spring (104) is fixed on the side of the linkage frame (102) away from the docking frame (202). An anti-detachment block (205) is fixed on the other end of the return spring (104). The anti-detachment block (205) is installed on the end of the limiting rod (204) away from the docking frame (202). When the first limiting clamp (1) moves and closes with the second limiting clamp (2), the linkage frame (102) moves toward the docking frame (202), and the return spring (104) expands until the first sealing joint (103) and the second sealing joint (203) abut against the through hole of the product.

3. The limit detection tool for preventing the product from being deformed by positive pressure according to claim 2, characterized in that: Below the first limiting clamp (1) and the second limiting clamp (2) are multiple parallel support frames (4). The front end of the support frame (4) is fixed by a connecting frame (5). Multiple straight guide rods (6) are fixed on the connecting frame (5). The bottom end of each limiting clamp (1) is fixedly equipped with a plurality of first sliding blocks (101), and the bottom end of each limiting clamp (2) is equipped with a plurality of second sliding blocks (201). The first sliding blocks (101) and the second sliding blocks (201) are slidably connected to the linear guide rod (6).

4. The limit detection tool for preventing the product from being deformed by positive pressure according to claim 3, characterized in that: The limiting clamps 2 (2) and 1 (1) in the two adjacent product limiting units are connected by a connecting frame (3). The first sliding block (101) at the bottom of the limiting clamp 1 (1) in the two adjacent product limiting units is connected by a first pressure spring (8), and the second sliding block (201) at the bottom of the limiting clamp 2 (2) is connected by a second pressure spring (9). When the limiting clamp 1 (1) in the front product limiting unit moves and closes with the limiting clamp 2 (2), as the limiting clamp 1 (1) continues to move, the limiting clamp 2 (2), the connecting frame (3) and the limiting clamp 1 (1) in the rear product limiting unit move synchronously. The limiting clamp 1 (1) and the limiting clamp 2 (2) in the rear product limiting unit close one after another, and the first pressure spring (8) and the second pressure spring (9) contract one after another until multiple product limiting units close together.

5. The limit detection tool for preventing the product from being deformed by positive pressure according to claim 4, characterized in that: The rear end of the support frame (4) is fixed by an intercepting plate (7), when the limiting clamping plate one (1) and the limiting clamping plate two (2) in the product limiting unit are closed, the limiting clamping plate two (2) in the product limiting unit at the tail end is in abutment with the intercepting plate (7).

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