An airtightness testing device for casing products

Abstract

This utility model discloses an airtightness testing device for shell products, including a testing frame, a sealing and tightening assembly, a movable tightening assembly, and a lifting device. The sealing and tightening assembly is installed on a first side plate of the testing frame to seal the cavity opening of the workpiece. The movable tightening assembly is installed on a second side plate of the testing frame to cooperate with the sealing and tightening assembly to fix the workpiece. The first and second side plates are arranged opposite to each other, and the axial center line of the sealing and tightening assembly coincides with the axial center line of the movable tightening assembly. The upper support plate of the testing frame is fixed to the lifting end of the lifting device, and the lifting device controls the up-and-down movement of the testing frame. This utility model achieves high-precision airtightness testing of the workpiece through limiting slot positioning and a bidirectional tightening structure, while utilizing adjustable support and buffer design to improve the adaptability and testing reliability of shells of various specifications.

Description

Technical Field

[0001] This utility model belongs to the field of airtightness testing technology, and specifically relates to an airtightness testing device for shell products. Background Technology

[0002] Air tightness testing is a crucial step in industrial production to ensure the sealing performance of casing products (such as automotive parts, electronic equipment, and piping systems). The traditional compressed air immersion method is widely used for leak detection due to its intuitiveness and low cost. This method involves filling the workpiece with compressed air and immersing it in water, observing the bubbles to determine the location and extent of the leak. However, in practical applications, the testing stability of this method is affected by various factors, leading to inconsistent test results and impacting product quality control. Especially in traditional testing, the axial positioning of the workpiece (particularly irregularly shaped casings) is prone to misalignment, resulting in uneven stress on the sealing ring and subsequent leakage. Furthermore, fixed fixtures are difficult to adapt to workpieces of different sizes and shapes, requiring frequent tooling changes and resulting in low efficiency.

[0003] During the clamping process, the instability of the clamping during installation often leads to the instability of the seal of the workpiece opening, thus affecting the airtightness test. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an airtightness testing device for shell products. It achieves high-precision airtightness testing of workpieces through positioning with limiting slots and bidirectional clamping structure. At the same time, it improves the adaptability and testing reliability of shells of various specifications by utilizing adjustable support and buffer design.

[0005] The main technical solution adopted in this utility model is as follows:

[0006] An airtightness testing device for casing products includes a testing frame, a sealing and tightening assembly, a movable tightening assembly, and a lifting device. The sealing and tightening assembly is installed on a first side plate of the testing frame to seal the cavity opening of the workpiece. The movable tightening assembly is installed on a second side plate of the testing frame to cooperate with the sealing and tightening assembly to fix the workpiece. The first and second side plates are arranged opposite to each other, and the axial center line of the sealing and tightening assembly coincides with the axial center line of the movable tightening assembly. The upper support plate of the testing frame is fixed to the lifting end of the lifting device, and the lifting device controls the up-and-down movement of the testing frame.

[0007] Preferably, the sealing and tightening assembly includes a fastener and a sealing cover plate. The sealing cover plate is installed on the first side plate by the fastener. A limiting groove is formed on the sealing end face of the sealing cover plate, and the contour of the limiting groove is consistent with the outer contour of the cavity opening end of the workpiece. A sealing ring groove is provided on the end face of the sealing cover plate that abuts against the cavity opening end of the workpiece for installing a sealing ring. The sealing ring groove is located in the limiting groove. An air channel is provided on the sealing cover plate for communicating with compressed air.

[0008] Preferably, the movable clamping assembly 3 includes an adjusting screw, an adjusting nut, a half-plate, and a clamping block. The adjusting nut is installed on the second side plate. The telescopic end of the adjusting screw is connected to the clamping block through the half-plate. The driving end of the adjusting screw passes through the adjusting nut and the second side plate in sequence and is connected to the driving component. The clamping block abuts against the tail end of the workpiece.

[0009] Preferably, it further includes at least one set of adjustable support components, which are mounted on the lower support plate for supporting the workpiece.

[0010] Preferably, the adjustable support assembly includes an adjustable support screw, an adjustable support nut, and a support block. The adjustable support nut is fixed to the lower support plate. One end of the adjustable support screw is fitted with the adjustable support nut. The support block is installed at the other end of the adjustable support screw and abuts against the outer peripheral surface of the workpiece. The central axis of the adjustable support screw is perpendicular to the central axis of the movable clamping assembly.

[0011] Preferably, the workpiece contact end of the support block is designed as an arc-shaped surface or a V-shaped surface.

[0012] Preferably, the workpiece abutment end of the clamping block is further provided with a rubber pad for cushioning.

[0013] Beneficial effects: This utility model provides an airtightness testing device for casing products, which has the following advantages:

[0014] (1) This utility model utilizes a dual design of limiting groove and sealing ring. The limiting groove of the sealing cover plate matches the outline of the workpiece opening to ensure accurate radial positioning; the built-in sealing ring groove achieves axial flexible sealing and reduces the risk of leakage.

[0015] (2) The present invention uses the adjusting screw of the movable clamping component and the half pressure plate structure to achieve axial stroke adjustment, and at the same time, it is equipped with a replaceable sealing cover plate (different limit slots) to quickly adapt to workpieces of different sizes.

[0016] (3) This utility model adjusts the height of the support block by screw, so that the axis of the workpiece coincides with the center line of the clamping assembly, avoiding sealing failure caused by off-center load, and providing auxiliary support for the workpiece, which is conducive to improving the stability of workpiece installation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 (lifting device omitted);

[0018] Figure 2 for Figure 1 Enlarged cross-sectional view of point A in the middle;

[0019] Figure 3 This is a partial top view of Embodiment 1;

[0020] In the diagram: Detection frame 1, First side plate 1-1, Second side plate 1-2, Upper support plate 1-3, Lower support plate 1-4, Sealing and tightening assembly 2, Fastener 2-1, Sealing cover plate 2-2, Limiting groove 2-21, Sealing ring groove 2-22, Sealing ring 2-23, Air channel 2-24, Movable tightening assembly 3, Adjusting screw 3-1, Adjusting nut 3-2, Half pressure plate 3-3, Pressing block 3-4, Rubber pad 3-5, Workpiece 4, Adjustable support assembly 5, Adjustable support screw 5-1, Adjustable support nut 5-2, Support block 5-3. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. Example 1

[0022] like Figure 1-3 As shown, an airtightness testing device for casing products includes a testing frame 1, a sealing and tightening assembly 2, a movable tightening assembly 3, and a lifting device. The sealing and tightening assembly 2 is installed on the first side plate 1-1 of the testing frame 1 and is used to seal the cavity opening end of the workpiece 4. The movable tightening assembly 3 is installed on the second side plate 1-2 of the testing frame 1 and is used to cooperate with the sealing and tightening assembly 2 to fix the workpiece. The first side plate 1-1 and the second side plate 1-2 are arranged opposite to each other, and the axial center line of the sealing and tightening assembly 2 coincides with the axial center line of the movable tightening assembly 3. The upper support plate 1-3 of the testing frame 1 is fixed to the lifting end of the lifting device, and the lifting device controls the testing frame 1 to move up and down.

[0023] In this embodiment 1, the sealing and tightening assembly 2 includes a fastener 2-1 and a sealing cover plate 2-2. The sealing cover plate 2-2 is installed on the first side plate 1-1 by the fastener 2-1. A limiting groove 2-21 is opened on the sealing end face of the sealing cover plate 2-2, and the outline of the limiting groove 2-21 is consistent with the outer outline of the cavity opening end of the workpiece 4. A sealing ring groove 2-22 is provided on the end face of the sealing cover plate 2-2 that abuts against the cavity opening end of the workpiece 4, for installing the sealing ring 2-23. The sealing ring groove 2-22 is located in the limiting groove 2-21. An air channel 2-24 is provided on the sealing cover plate 2-2 for connecting compressed air.

[0024] In this utility model, the fastener 2-1 can be fixed by using existing fastening connections such as bolts and screws.

[0025] In this embodiment 1, the movable clamping assembly 3 includes an adjusting screw 3-1, an adjusting nut 3-2, a half-plate 3-3, and a clamping block 3-4. The adjusting nut 3-2 is installed on the second side plate 1-2. The telescopic end of the adjusting screw 3-1 is connected to the clamping block 3-4 through the half-plate 3-3. The driving end of the adjusting screw 3-1 passes through the adjusting nut 3-2 and the second side plate 1-2 in sequence and is connected to the driving component. The clamping block 3-4 abuts against the tail end of the workpiece 4.

[0026] In this utility model, the adjusting screw 3-1 of the movable clamping assembly 3 can be driven and controlled by existing drive components such as handwheels and waterproof motors.

[0027] In order to reduce the wear of the workpiece by the clamping block 3-4 during the adjustment process and to provide a buffer for the clamping block to contact the workpiece, the present invention also provides a rubber pad 3-5 at the workpiece abutment end of the clamping block to avoid damaging the workpiece surface, which is especially suitable for sprayed or precision machined parts.

[0028] In this embodiment 1, at least one set of adjustable support components 5 is also provided on the detection frame 1. The adjustable support components 5 are installed on the lower support plate 1-4 and are used to support the workpiece 4. Under the auxiliary support of the adjustable support components, the central axis of the workpiece is kept parallel or coincident with the central axis of the movable clamping component during the workpiece installation and clamping process, thereby further ensuring the stability of the workpiece sealing and clamping.

[0029] In this embodiment 1, the specific structure of the adjustable support component 5 can be, but is not limited to, the following structures. For example... Figure 1As shown, the adjustable support assembly 5 includes an adjustable support screw 5-1, an adjustable support nut 5-2, and a support block 5-3. The adjustable support nut 5-2 is fixed on the lower support plate 1-4. One end of the adjustable support screw 5-1 is fitted with the adjustable support nut 5-2. The support block 5-3 is installed on the other end of the adjustable support screw 5-1 and abuts against the outer peripheral surface of the workpiece 4. The central axis of the adjustable support screw 5-1 is perpendicular to the central axis of the movable clamping assembly 3.

[0030] To improve the stability of the support block 5-3 in contact with the workpiece 4, the workpiece contact end of the support block 5-3 is designed as an arc-shaped surface or a V-shaped surface.

[0031] In this embodiment 1, the detection frame 1 includes a first side plate 1-1, a second side plate 1-2, an upper support plate 1-3, and a lower support plate 1-4, and the first side plate 1-1 and the second side plate 1-2 are arranged parallel to each other between the upper support plate 1-3 and the lower support plate 1-4.

[0032] In this utility model, the detection frame 1 can be, but is not limited to, the above-mentioned structure. The existing detection frame 1 can satisfy the requirement that the upper support plate can be installed on the lifting end of the lifting device, and the first side plate 1-1 and the second side plate 1-2 can satisfy the installation of the sealing and tightening component 2 and the movable tightening component 3.

[0033] The working principle of this utility model is as follows:

[0034] When testing the airtightness of a workpiece, first adjust the height of the support block 5-3 in the adjustable support assembly 5 by rotating the adjustable support screw 5-1 to ensure that the central axis of the workpiece after placement coincides with the central axis of the movable clamping assembly 3 (at the same height). Then, position the workpiece in the support block 5-3 of the adjustable support assembly 5, with the support block 5-3 providing assistance. Next, push the workpiece axially towards the sealing cover plate 2-2 of the sealing clamping assembly 2 until the outer contour of the cavity opening end of the workpiece 4 is embedded in the limiting slot 2-21, abutting against the sealing ring 2-23 in the sealing ring groove 2-22 for sealing. Then, drive the adjusting screw 3-1 of the movable clamping assembly 3 to move, thereby driving the clamping block 3-4 to axially clamp the tail end of the workpiece 4, cooperating with the sealing clamping assembly 2 to fix the workpiece. Finally, control the lifting device to lower the entire testing frame 1 into the testing water tank, and introduce compressed air through the air channel 2-24 from the cavity opening end of the workpiece 4 to test the airtightness of the shell product.

[0035] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A device for detecting the airtightness of casing products, characterized in that, The device includes a detection frame, a sealing and tightening assembly, a movable tightening assembly, and a lifting device. The sealing and tightening assembly is installed on the first side plate of the detection frame to seal the cavity opening of the workpiece. The movable tightening assembly is installed on the second side plate of the detection frame to cooperate with the sealing and tightening assembly to fix the workpiece. The first and second side plates are arranged opposite to each other, and the axial center line of the sealing and tightening assembly coincides with the axial center line of the movable tightening assembly. The upper support plate of the detection frame is fixed to the lifting end of the lifting device, and the lifting device controls the up and down movement of the detection frame.

2. The airtightness testing device for casing products according to claim 1, characterized in that, The sealing and tightening assembly includes fasteners and a sealing cover plate. The sealing cover plate is installed on the first side plate by the fasteners. A limiting groove is opened on the sealing end face of the sealing cover plate, and the outline of the limiting groove is consistent with the outer outline of the cavity opening end of the workpiece. A sealing ring groove is provided on the end face of the sealing cover plate that abuts against the cavity opening end of the workpiece for installing a sealing ring. The sealing ring groove is located in the limiting groove. An air channel is provided on the sealing cover plate for connecting compressed air.

3. The airtightness testing device for casing products according to claim 1, characterized in that, The movable clamping assembly includes an adjusting screw, an adjusting nut, a half-plate, and a clamping block. The adjusting nut is mounted on the second side plate. The telescopic end of the adjusting screw is connected to the clamping block through the half-plate. The driving end of the adjusting screw passes through the adjusting nut and the second side plate in sequence and is connected to the driving component. The clamping block abuts against the tail end of the workpiece.

4. The airtightness testing device for casing products according to claim 1, characterized in that, It also includes at least one set of adjustable support components, which are mounted on the lower support plate for supporting the workpiece.

5. The airtightness testing device for casing products according to claim 4, characterized in that, The adjustable support assembly includes an adjustable support screw, an adjustable support nut, and a support block. The adjustable support nut is fixed to the lower support plate. One end of the adjustable support screw is fitted with the adjustable support nut. The support block is installed at the other end of the adjustable support screw and abuts against the outer peripheral surface of the workpiece. The central axis of the adjustable support screw is perpendicular to the central axis of the movable clamping assembly.

6. The airtightness testing device for casing products according to claim 5, characterized in that, The workpiece contact end of the support block is designed as an arc-shaped surface or a V-shaped surface.

7. The airtightness testing device for casing products according to claim 3, characterized in that, The workpiece abutment end of the clamping block is also provided with a rubber pad for cushioning.

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