A sealed test device

Abstract

This utility model discloses a sealing test device for detecting the sealing performance of a workpiece. The device includes: an upper cavity, a lower cavity, a clamping column, and a sealing block for sealing the oil passage hole on the workpiece. The lower cavity has a through-chamber, and an inflation hole is provided on the lower cavity. The sealing block is installed on the lower end of the clamping column and has at least a horizontal degree of freedom to move within the lower cavity. An air passage is formed between the clamping column and the inner wall of the lower cavity, connecting the sealing block and the workpiece joint to the inflation hole. During testing, the lower cavity is sealed to the workpiece around the oil passage hole. The clamping column is compressed downwards by the upper cavity until the sealing block is pressed against the oil passage hole. Air is injected into the inflation hole, forming high-pressure gas in the air passage. At this time, the device detects whether there is any leakage between the sealing block and the oil passage hole, thus completing the sealing test of the workpiece. This method meets product testing requirements while also achieving cost savings.

Description

Technical Field

[0001] This utility model belongs to the field of machining testing equipment, and specifically relates to a sealing testing device. Background Technology

[0002] When a hard workpiece is in operation, the oil passage holes on it need to cooperate with the sealing holes to switch between two states: closed and open. In the closed state, there should be no or only a very small possibility of leakage. Therefore, the workpiece needs to undergo a sealing test before leaving the factory. Since the sealing component in contact with the workpiece is also made of hard material, the test sealing block for the oil passage hole sealing needs to simulate the sealing block used in the workpiece's working state. However, the existing sealing test device cannot achieve adaptive fitting and sealing on the hard contact surface between the sealing block and the oil passage hole. How to solve the above-mentioned adaptive sealing test is a technical problem that urgently needs to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a sealing test device.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a sealing test device, which is used to test the sealing performance of a workpiece, the device comprising: an upper cavity and a lower cavity;

[0005] The lower cavity has a vertically penetrating lower chamber, and an air inlet communicating with the lower chamber is provided on the lower cavity.

[0006] The device further includes a pressing column that moves up and down with the upper cavity and has telescopic flexibility, and a sealing block for sealing the oil passage hole on the workpiece. The sealing block is installed on the lower end of the pressing column and has at least one degree of freedom to move horizontally within the lower cavity. An air passage is formed between the pressing column and the inner wall of the lower cavity, connecting the sealing block and the workpiece joint to the air inlet. During testing, the lower cavity is sealed to the workpiece around the oil passage hole, the pressing column is compressed downward by the upper cavity until the sealing block is pressed against the oil passage hole, and air is injected into the air inlet, forming high-pressure gas in the air passage. At this time, the sealing block and the oil passage hole are checked for leakage, thus completing the sealing test of the workpiece.

[0007] In another embodiment, the clamping column includes a column body movable in the vertical direction and disposed in the lower cavity, and an elastic element connected between the upper end of the column body and the upper cavity to ensure that the column body always has a downward tendency. When the upper cavity moves downward, the column body presses the sealing block onto the oil passage hole. The elastic element buffers the pressure of the column body on the workpiece, preventing the workpiece from deforming, and at the same time provides the sealing block with a certain degree of freedom of left and right movement to ensure that the sealing block is aligned with the oil passage hole.

[0008] In another embodiment, a magnetic block with magnetic properties is embedded in the lower end of the column body. The sealing block is attracted to the magnetic block and has at least a degree of freedom to move in the horizontal direction in the lower cavity, ensuring that the sealing block is aligned with the oil passage hole.

[0009] In another embodiment, the lower chamber comprises, from top to bottom, a first lower chamber segment, a second lower chamber segment, and a third lower chamber segment, wherein the diameter of the second lower chamber segment is larger than the diameter of the third lower chamber segment. The column body comprises, from top to bottom, a first column segment, a second column segment, and a third column segment. A central boss is formed at the joint of the second lower chamber segment and the third lower chamber segment to limit the downward stroke of the second column segment; this further prevents the column body from excessively compressing the workpiece, which could lead to workpiece deformation.

[0010] In another embodiment, the magnetic block is embedded on the lower end surface of the column body, and a limiting ring is formed on the lower end surface of the column body and around the magnetic block. The sealing block is attracted by the magnetic block on the lower end surface of the column body and is restricted within the range of the limiting ring.

[0011] In another embodiment, the sealing block is spherical; the oil passage is a circular hole with an arc-shaped depression around its perimeter, and the spherical sealing block matches the oil passage precisely.

[0012] In another embodiment, the lower end of the upper cavity has an upper boss that extends downward and into the lower cavity. A limiting hole is formed on the lower end face of the upper boss. The upper end of the clamping column is connected to the limiting hole, and the upper end of the elastic element is fixed in the limiting hole. The limiting hole provides a certain guiding function for the elastic element.

[0013] In another embodiment, an upper sealing ring is provided on the lower end face of the upper cavity and around the upper boss. When the upper cavity moves downward and pushes the pressing column downward until the sealing block presses on the oil passage hole, the lower end face of the upper cavity presses on the upper end face of the lower cavity, and the upper sealing ring seals and fits the lower end face of the upper cavity and the upper end face of the lower cavity.

[0014] In another embodiment, a lower sealing ring is provided on the lower end of the lower cavity. When the upper cavity moves downward and pushes the pressing column downward until the sealing block presses on the oil passage hole, the lower sealing ring is sleeved around the oil passage hole of the workpiece, so that the contact surface between the lower end of the lower cavity and the workpiece is sealed.

[0015] In another embodiment, the device includes a connecting rod connected to the upper end of the upper cavity, the connecting rod being connected to a power source for the downward pressing action, the power source being a cylinder or a hydraulic cylinder, etc.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: By movably connecting the sealing block to the lower end of the clamping column, this utility model can enable the sealing block to automatically find the final suitable sealing position, and can stably test whether the workpiece leaks or what the leakage value is, so as to screen out products that meet the customer's terminal leakage requirements, which can both meet the product testing requirements and achieve the goal of saving costs. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention;

[0018] Figure 2 for Figure 1 AA sectional view. Detailed Implementation

[0019] The sealing test device is used to test the sealing performance of the oil passage hole B at the top of workpiece 0, such as... Figure 1-2 As shown, the device includes: an upper cavity 2, a lower cavity 8, a pressing column, a sealing block 7, and a connecting rod 1 connected to the upper end of the upper cavity 2; a lower chamber is formed in the lower cavity, and an air inlet 5 communicating with the lower chamber is provided on the lower cavity; the pressing column moves up and down with the upper cavity 2 and has telescopic properties; the sealing block 7 is used to seal the oil passage hole B on the workpiece 0; the sealing block 7 is installed on the lower end of the pressing column and has at least a degree of freedom to move in the horizontal direction within the lower cavity; an air passage is formed between the pressing column and the inner wall of the lower cavity 8, connecting the sealing block 7 and the workpiece 0 joint and the air inlet 5; the connecting rod 1 is connected to the power source for the downward pressing action, which can be a cylinder or a hydraulic cylinder, etc.

[0020] Specifically:

[0021] The clamping column includes a column body 4 movable in the vertical direction and located in the lower cavity, and an elastic element 3 connecting the upper end of the column body 4 and the upper cavity 2 to ensure that the column body 4 always has a downward tendency. When the upper cavity 2 moves downward, the column body 4 presses the sealing block 7 onto the oil passage hole B. The elastic element 3 buffers the pressure of the column body 4 on the workpiece 0, preventing the workpiece 0 from deforming, and at the same time provides a certain degree of freedom of left and right movement for the sealing block 7 to ensure that the sealing block 7 is aligned with the oil passage hole B. In order to achieve free movement of the sealing block 7, a groove with a wide belly and a narrow opening can be opened at the lower end of the column body 4, and the sealing block 7 can be embedded in the groove, with a certain margin between the sealing block 7 and the side wall of the groove. However, in order to reduce the processing difficulty, in this embodiment, a magnetic block 6 with magnetic properties is embedded at the lower end of the column body 4, and the sealing block 7 is spherical. The oil passage hole B is a circular hole with an arc-shaped depression around its perimeter, and the spherical sealing block 7 matches the oil passage hole B perfectly. The magnetic block 6 is embedded on the lower end face of the column body 4. A limiting ring 44 is formed on the lower end face of the column body 4 and around the magnetic block 6. The sealing block 7 is attracted to the lower end face of the column body 4 by the magnetic block 6 and is restricted within the range of the limiting ring 44. The sealing block 7 is attracted to the magnetic block 6 and has at least one degree of freedom to move in the horizontal direction within the lower cavity, ensuring that the sealing block 7 is aligned with the oil passage hole B.

[0022] The lower chamber comprises, from top to bottom, a first lower chamber segment 81, a second lower chamber segment 82, and a third lower chamber segment 83. The diameter of the second lower chamber segment 82 is larger than the diameter of the third lower chamber segment 83. The column body 4 comprises, from top to bottom, a first column segment 41, a second column segment 42, and a third column segment 43. A central boss 84 is formed at the joint of the second lower chamber segment 82 and the third lower chamber segment 83 to limit the downward stroke of the second column segment 42, further preventing the column body 4 from excessively compressing the workpiece 0 and causing deformation of the workpiece 0.

[0023] The lower end of the upper cavity 2 has an upper boss 21 that extends downward and into the lower cavity 8. A limiting hole 22 is formed on the lower end face of the upper boss 21. The upper end of the pressing column is connected to the limiting hole 22. In this embodiment, the upper end of the elastic element 3 is fixed in the limiting hole 22, and the limiting hole 22 provides a certain guiding function for the elastic element 3. An upper sealing ring 9 is provided on the lower end face of the upper cavity 2 and around the upper boss 21. When the upper cavity 2 moves downward and pushes the pressing column downward until the sealing block 7 presses on the oil passage hole B, the lower end face of the upper cavity 2 presses on the upper end face of the lower cavity 8, and the upper sealing ring 9 seals and fits the lower end face of the upper cavity 2 and the upper end face of the lower cavity 8.

[0024] The lower end of the lower cavity 8 is provided with a lower sealing ring 10. When the upper cavity 2 moves downward and pushes the pressing column downward until the sealing block 7 presses on the oil passage hole B, the lower sealing ring 10 is sleeved around the oil passage hole B of the workpiece 0, so that the contact surface between the lower end of the lower cavity 8 and the workpiece 0 is sealed.

[0025] During the test, the lower cavity 8 is sealed and fitted to the workpiece 0 around the oil passage hole B. The clamping column is compressed downward by the upper cavity 2 until the sealing block 7 is pressed against the oil passage hole B. Air is injected into the air inlet 5, forming high-pressure gas in the air passage. At this time, it is checked whether there is any air leakage between the sealing block 7 and the oil passage hole B, thus completing the sealing test of the workpiece 0.

[0026] This patent mainly targets the sealing of steel parts by steel balls. Through mechanical transmission, the spherical sealing block 7 seals the oil passage hole B. The sealing performance of the oil passage hole B is tested by the force of the elastic element 3, which also achieves the goal of saving costs. Its working principle is as follows: The cylinder is connected by the connecting rod 1. The cylinder compresses the elastic element 3 through the upper cavity 2. The elastic element 3 applies a certain force to the column body 4 and the sealing block 7. Because the sealing block 7 is attracted by the magnetic fastener, it can rotate freely or shift within a certain range. The air passage is filled with air through the air inlet 5. Due to the sealing of the upper cavity 2, the upper sealing ring 9, the lower cavity 8 and the T-shaped lower sealing ring 10, the gas can form a sealed space. At this time, the leakage value of the gas can be tested at the top of the workpiece 0.

[0027] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A seal testing apparatus for detecting the sealing performance of a workpiece, the apparatus comprising: Upper cavity, lower cavity; Its features are: The lower cavity has a vertically penetrating lower chamber, and an air inlet communicating with the lower chamber is provided on the lower cavity. The device further includes a pressing column that moves up and down with the upper cavity and has telescopic properties, and a sealing block for sealing the oil passage hole on the workpiece. The sealing block is installed on the lower end of the pressing column and has at least a degree of freedom to move in the horizontal direction within the lower cavity. An air passage is formed between the pressing column and the inner wall of the lower cavity, connecting the sealing block and the workpiece joint and the air inlet.

2. The sealed test device of claim 1, wherein: The clamping column includes a column body movable in the lower cavity along the vertical direction, and an elastic element connected between the upper end of the column body and the upper cavity to ensure that the column body always has a downward movement tendency. When the upper cavity moves downward, the column body presses the sealing block onto the oil passage hole.

3. The sealed test device of claim 2, wherein: A magnetic block with magnetic properties is embedded in the lower end of the column body. The sealing block is attracted to the magnetic block and has at least one degree of freedom to move in the horizontal direction within the lower cavity.

4. The sealed test device of claim 2, wherein: The lower chamber comprises, from top to bottom, a first lower chamber segment, a second lower chamber segment, and a third lower chamber segment. The diameter of the second lower chamber segment is larger than the diameter of the third lower chamber segment. The column body comprises, from top to bottom, a first column segment, a second column segment, and a third column segment. A central boss is formed at the joint of the second lower chamber segment and the third lower chamber segment to limit the downward travel of the second column segment.

5. The sealed test device of claim 3, wherein: The magnetic block is embedded on the lower end surface of the column body, and a limiting ring is formed on the lower end surface of the column body and around the magnetic block.

6. The sealed test device of claim 1, wherein: The sealing block is spherical.

7. The sealed test device of claim 1, wherein: The lower end of the upper cavity has an upper boss that extends downward and into the lower cavity. A limiting hole is formed on the lower end face of the upper boss, and the upper end of the clamping column is connected to the limiting hole.

8. The sealed test device of claim 7, wherein: The lower end face of the upper cavity and the area around the upper boss are provided with an upper sealing ring. When the upper cavity moves downward and pushes the pressing column downward until the sealing block presses on the oil passage hole, the lower end face of the upper cavity presses on the upper end face of the lower cavity.

9. The sealed test device of claim 1, wherein: A lower sealing ring is provided at the lower end of the lower cavity.

10. The sealed test device of claim 1, wherein: The device includes a connecting rod connected to the upper end of the upper cavity.

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