Flexible pressing tool for helium detection product of vacuum box

Abstract

The utility model relates to the technical field of helium detection, and particularly discloses a flexible pressing tool for a vacuum box helium detection product, which comprises a fixed block. A plurality of fasteners are in threaded connection with openings in the upper ends of the fixing blocks; the fixing block can be stably connected to the compression tool through the fasteners, and can move up and down along with the compression tool to press an object to be detected for helium detection; the degree of extruding the spring is changed by rotating the positions of the first nut and the second nut on the T-shaped screw rod, so that the T-shaped screw rod has set elastic force at the initial position in the counterbore, external force is not applied to the product, and when the pressing sleeve is in contact with the product for pressing to achieve sealing, the pressing force is the elastic force of the spring, so that the sealing effect is improved. When the product is filled with helium for helium detection, the product slightly expands to jack up the T-shaped screw rod, and as long as the jacking amplitude is not greater than the depth of the counterbore, the stress on the product is only the spring force for compressing the deformation quantity of the sealing ring.

Description

Technical Field

[0001] This utility model relates to the field of helium detection technology, specifically a flexible clamping tool for vacuum chamber helium detection products. Background Technology

[0002] Helium testing is an inspection method that involves evacuating the workpiece and then filling it with helium gas at a certain pressure. The workpiece is placed in a vacuum chamber with a certain vacuum level requirement, and the vacuum chamber is connected to the leak detection port of a helium mass spectrometer.

[0003] Chinese utility model patent CN209407997U, published on September 20, 2019, discloses a hydraulic mechanical clamping device, including a frame. The device is characterized by: a base at the bottom of the frame's inner cavity; a hydraulic cylinder on the base; a movably connected hydraulic rod at the output end of the hydraulic cylinder; a support plate at the end of the hydraulic rod away from the hydraulic cylinder; a fixing block in the middle of the upper surface of the support plate; a telescopic rod on the fixing block; a first spring sleeved on the surface of the telescopic rod; a first clamping device at the end of the telescopic rod away from the fixing block; and connecting rods on both sides of the support plate near the fixing block, with an adjusting groove in the middle of each connecting rod. The advantage of this utility model compared to existing technologies is that the clamping degree is adjustable.

[0004] However, the above-mentioned disclosed solutions have the following shortcomings: Although the existing elastic clamping devices can also achieve the function of adjusting the clamping force, they cannot limit the maximum safe clamping force. Especially when the clamped object needs to be subjected to reverse force for sealing test, they cannot achieve the limit required for sealing test while reflecting pressure change. Utility Model Content

[0005] The purpose of this invention is to solve the problem that while existing elastic clamping devices can adjust the clamping force, they cannot limit the maximum safe clamping force. In particular, when the clamped object needs to be subjected to reverse force for sealing testing, they cannot achieve the technical problem of limiting the pressure change required for sealing testing. This invention provides a flexible clamping tool for vacuum chamber helium testing products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution;

[0007] The present invention relates to a flexible clamping fixture for a vacuum chamber helium testing product, comprising a fixing block; a plurality of fasteners are threadedly connected to the upper end of the fixing block; a countersunk hole is provided at the upper end of the fixing block; a T-shaped screw is slidably inserted into the countersunk hole; a first nut, a second nut, a pressing sleeve, and a spring are threadedly sleeved at the lower end of the T-shaped screw.

[0008] Furthermore, the pressing sleeve is symmetrically provided with first locking grooves.

[0009] Furthermore, the lower end of the T-shaped screw is symmetrically provided with a second locking groove.

[0010] The flexible clamping fixture for vacuum chamber helium testing products provided by this utility model has the following beneficial effects:

[0011] 1. This utility model uses multiple fasteners to stably connect the fixing block to the pressing fixture, allowing it to move up and down with the pressing fixture to press the object to be tested for helium testing. By rotating the positions of the first and second nuts on the T-shaped screw, the degree of compression of the spring is changed, so that the initial position of the T-shaped screw in the countersunk hole has a set elastic force, without applying external force to the product. When the pressing sleeve contacts the product to achieve a seal, the pressing force is the elastic force of the spring. When the product is filled with helium for helium testing, the product slightly expands and lifts the T-shaped screw. As long as the lifting amplitude does not exceed the depth of the countersunk hole, the force on the product is only the spring force compressing the deformation of the sealing ring.

[0012] 2. This utility model allows the T-shaped screw to be clamped by a tool through the second locking slot, preventing it from rotating. This allows the first nut and the second nut to rotate and move upward along the T-shaped screw, compressing the rectangular spring to generate pressure. This allows the T-shaped screw to be pre-loaded with elasticity, so that the initial pressure of the external force compressing the test object can be set to meet the compression sealing requirements. This enables the test object to be compressed and sealed while being inflated to observe the sealing performance and deformation. Attached Figure Description

[0013] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings;

[0014] Figure 1 This is a schematic diagram of the first isometric structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the second isometric structure of this utility model;

[0016] Figure 3 This is a front cross-sectional view of the present invention.

[0017] Figure 4 This is a schematic diagram of the assembly front structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the assembly axial structure of this utility model.

[0019] The following are the labels in the diagram: 1. Fixing block; 2. Fastener; 3. Countersunk hole; 4. T-bolt; 5. First nut; 6. Second nut; 7. Press sleeve; 8. First locking groove; 9. Spring; 10. Second locking groove; 11. Pressing fixture; 12. Limiting post. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that all directional indications (such as up-down-left-right-forward-backward...) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0023] Please see Figure 1-5 As shown, a flexible clamping fixture for a vacuum chamber helium testing product includes a fixing block 1; a plurality of fasteners 2 are threadedly connected to the upper end of the fixing block 1; a countersunk hole 3 is provided at the upper end of the fixing block 1; a T-shaped screw 4 is slidably inserted into the countersunk hole 3; a first nut 5, a second nut 6, a pressing sleeve 7, and a spring 9 are threadedly sleeved at the lower end of the T-shaped screw 4. The fixing block 1 can be stably connected to the clamping fixture 11 by the plurality of fasteners 2, and can move up and down with the clamping fixture 11 to press the test object for helium testing; by rotating the first nut 5, a second nut 6, a pressing sleeve 7, and a spring 9, the fixing block 1 can be stably connected to the clamping fixture 11. The positions of the first nut 5 and the second nut 6 on the T-screw 4 change the degree of compression of the spring 9, so that the initial position of the T-screw 4 in the countersunk hole 3 has a set elastic force and does not apply external force to the product. When the pressing sleeve 7 contacts the product to achieve a seal, the pressing force is the elastic force of the spring 9. When the product is filled with helium for helium testing, the product slightly expands and lifts the T-screw 4. As long as the lifting amplitude does not exceed the depth of the countersunk hole 3, the force on the product is only the force of the spring 9 that compresses the deformation of the sealing ring.

[0024] The pressing sleeve 7 is symmetrically provided with first locking grooves 8. A tool is fitted onto the first locking groove 8 so that the pressing sleeve 7 can be rotated and threaded onto the lower end of the T-shaped screw 4.

[0025] The lower end of the T-shaped screw 4 is symmetrically provided with a second locking groove 10. The T-shaped screw 4 can be clamped by a tool through the second locking groove 10 to prevent it from rotating. This allows the first nut 5 and the second nut 6 to rotate and move upward along the T-shaped screw 4, compressing the rectangular spring 9 to generate pressure. This allows the T-shaped screw 4 to be pre-loaded with elasticity, so that the initial pressure of the external force compressing the test object can be set to meet the pressure sealing requirements. This allows the test object to be compressed and sealed while being inflated to observe the sealing performance and deformation.

[0026] The fastener 2 is fitted with a compression fixture 11, which makes the fixing block 1 and the T-shaped screw 4 in a suspended position, so that they can move up and down with the compression fixture 11, thereby squeezing the object to be tested for sealing and fixing it to achieve a specific compression value. At the same time, it meets the sealing requirements and can also accommodate the pressure sealing requirements after the object to be tested is inflated and deformed.

[0027] Multiple limiting posts 12 are fixedly connected inside the compression fixture 11. The limiting posts 12 can block the descending part of the compression fixture 11, thereby limiting the maximum moving distance and thus limiting the maximum pressure on the object to be tested.

[0028] The upper hole depth of the countersunk hole 3 is greater than the upper thickness of the T-shaped screw 4, so that when the upper end of the fixing block 1 is in contact with the lower surface of the pressing fixture 11, the T-shaped screw 4 still has a distance to move in the countersunk hole 3, and after moving a certain distance, it presses against the pressing fixture 11 to achieve a rigid connection.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A flexible pressing tool for vacuum box helium inspection products, characterized in that; The utility model relates to a fixing block (1);A plurality of fasteners (2) are connected in thread on the upper end hole of fixing block (1);The upper end of fixing block (1) is provided with a countersunk hole (3);T-shaped screw rod (4) is inserted into the countersunk hole (3) and slides, the lower end of T-shaped screw rod (4) is provided with first nut (5), second nut (6), pressing sleeve (7) and spring (9) in thread.

2. The flexible compression tooling for vacuum box helium inspection products of claim 1, wherein: The pressing sleeve (7) is provided with first clamping groove (8) symmetrically.

3. The flexible compression tooling for vacuum box helium inspection products of claim 1, wherein: The lower end of T-shaped screw rod (4) is provided with second clamping groove (10) symmetrically.

4. The flexible compression tooling for vacuum box helium inspection products of claim 1, wherein: The fastener (2) is provided with pressing tool (11) in thread.

5. The flexible compression tooling for vacuum box helium inspection products of claim 4, wherein: The pressing tool (11) is fixed with a plurality of limiting columns (12) in.

6. The flexible compression tooling for vacuum box helium inspection products of claim 1, wherein: The upper end hole depth of the countersunk hole (3) is greater than the thickness of the upper end of T-shaped screw rod (4).

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