Pressure maintaining testing machine

Abstract

The utility model relates to the technical field of air tightness detection of filter elements, in particular to a pressure maintaining testing machine, which comprises a workbench; the test assembly is arranged on the workbench and is suitable for accommodating the filter element; the fixing assembly is movably arranged on the workbench in the vertical direction and located above the testing assembly; the fixing assembly has a test state in which the fixing assembly is driven by the driving piece to move downwards in the vertical direction to fix the filter element and a separation state in which the fixing assembly moves upwards to be spaced from the filter element; the limiting assembly is arranged on the workbench; the adjusting end of the limiting assembly has a limiting state that the adjusting end is adjusted to abut against the fixing assembly downwards when the fixing assembly is in the testing state and an installation state that the adjusting end is adjusted to be away from the fixing assembly. The technical problems that in an existing pressure maintaining testing device, the stability is poor when a fixing assembly and a testing assembly are matched to fix a filter element, the situation that an air cylinder cannot press the filter element under the large pressure is likely to happen, and the requirement for testing the filter element under the high-pressure working condition is difficult to meet are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter element air tightness detection, in particular to a pressure-maintaining testing machine. Background Art

[0002] The pressure holding test is a common method for testing the air tightness of products. The basic principle is to cut off the gas source after the product is inflated, and observe whether the pressure drops within a period of time to determine whether the product has air leakage. The filter pressure holding test is one of the important tests to evaluate the structural strength of the filter. By applying a certain pressure between the inlet and outlet of the filter and measuring the deformation and leakage of the filter, the pressure resistance of the filter can be understood. The pressure holding test can help determine whether the filter can work safely and reliably under normal working pressure. In the field of filters, the role of the pressure holding test is to test the important parameters of filter performance. As various industries have higher and higher requirements for filter performance, the requirements for filter pressure holding tests are also getting higher and higher. Filters need more efficient, safe and reliable pressure holding test equipment to ensure the quality of filters.

[0003] Existing pressure-maintaining test equipment usually includes a workbench, a test assembly and a fixed assembly; the fixed assembly is set on the workbench through a cylinder and is located above the test assembly, and is driven by the cylinder to move in the vertical direction; during the test, the filter element is accommodated by the test assembly, and the fixed assembly is driven downward by the cylinder to cooperate with the test assembly to fix the filter element, and then compressed air is introduced to perform a pressure-maintaining test; however, the stability of the fixed assembly and the test assembly in fixing the filter element is poor, and the cylinder is prone to fail to hold down the filter under high pressure, which makes it difficult to meet the demand for testing the filter element under high pressure conditions. Utility Model Content

[0004] The utility model provides a pressure-maintaining test machine, which solves the technical problem that in the existing pressure-maintaining test equipment, the stability of the fixing assembly and the test assembly in cooperating to fix the filter element is poor, the cylinder is prone to fail to be pressed under a large pressure, and it is difficult to meet the technical problem of testing the filter element under high-pressure conditions.

[0005] In view of this, the utility model provides a pressure-maintaining testing machine, comprising:

[0006] Workbench;

[0007] A test assembly, disposed on the workbench and adapted to accommodate a filter element;

[0008] A fixing assembly is movably arranged on the workbench in a vertical direction and is located above the test assembly; the fixing assembly is driven by a driving member to move downward in a vertical direction to a test state for fixing the filter element, and to move upward to a separation state spaced apart from the filter element;

[0009] A limit assembly is arranged on the workbench; the adjustment end of the limit assembly has a limit state that is adjusted to downwardly abut against the fixing assembly when the fixing assembly is in a testing state, and a mounting state that is adjusted to be away from the fixing assembly.

[0010] Optionally, a limiting portion is provided on the fixing assembly; the limiting assembly includes a base plate, a telescopic member and a fastening hook claw; the base plate is arranged on the workbench; one end of the fastening hook claw is hinged to the base plate, and the other end is provided with a fastening portion facing the side of the fixing assembly, suitable for limiting the limiting portion by the fastening portion downwardly abutting; one end of the telescopic member is hinged to the base plate, and the other end is hinged to one end of the fastening hook claw having the fastening portion, suitable for controlling the fastening hook claw to rotate on the base plate by telescoping; when the limiting assembly is in a limiting state, the fastening hook claw rotates until the fastening portion downwardly abuts against the limiting portion; when the limiting assembly is in an installed state, the fastening hook claw rotates until the fastening portion is away from the limiting portion.

[0011] Optionally, the telescopic member is a cylinder, the cylinder is hinged to the base plate, and the output shaft of the cylinder is hinged to one end of the fastening claw having the fastening portion.

[0012] Optionally, an adjusting screw is slidably passed through the fastening portion from the top to the bottom, and the adjusting screw is threadably matched with the fastening portion; the fastening portion abuts downward against the limiting portion through the adjusting screw.

[0013] Optionally, each group of the fixing components is provided with a plurality of groups of the limiting components correspondingly, and the plurality of groups of the limiting components are evenly arranged around the periphery of the testing component.

[0014] Optionally, it further comprises an air purification component, wherein the air purification component is connected to the test component, and the test component is suitable for being connected to an external air source device through the air purification component.

[0015] Optionally, the air purification component includes at least one of a water removal filter, an oil removal filter and an activated carbon filter.

[0016] Optionally, it also includes an exhaust valve assembly, which is connected to the test assembly and is suitable for controlling the exhaust of airflow in the test assembly.

[0017] Optionally, the exhaust valve assembly includes a mounting frame and at least one ball valve, the mounting frame is disposed on the workbench, and the ball valve is connected to the test assembly.

[0018] Optionally, an air outlet communicating with the interior of the workbench is provided on the peripheral side of the workbench, and a cooling fan is provided at the air outlet;

[0019] And / or, a position detection component is provided at the output end of the driving component, and the position detection component is communicatively connected with the driving component and the limit assembly, and is suitable for detecting the moving distance of the fixed assembly through the position detection component.

[0020] The technical solution of the utility model has the following advantages:

[0021] In the utility model, when it is necessary to perform a pressure test on the filter element, the fixed assembly is driven by the driving member to move upward to a preset distance from the test assembly, that is, the fixed assembly is in a separated state, and then the filter element to be tested is placed in the test assembly, and then the fixed assembly is driven by the driving member to move downward to the fixed filter element for testing, that is, the fixed assembly is in a testing state, at this time, the adjusting end of the adjustment limit assembly is downwardly abutted against the fixed assembly to limit the fixed assembly in the vertical direction, and the fixed assembly is further fixed, and then compressed air can be introduced to perform a pressure test on the filter element. The pressure test machine provided in this embodiment limits the fixed assembly by setting a limit assembly, improves the stability of the fixed assembly fixing the filter element, makes it more firmly fixes the filter element, avoids the situation that the cylinder drives the fixed assembly and cannot be pressed due to excessive pressure, and at the same time can increase the pressure range of the filter element test, so that it can also be tested within a higher pressure value, which can meet the test of the filter element under high pressure conditions, improve the test effect, and ensure the stability during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of the pressure-maintaining testing machine provided by the utility model at a first viewing angle;

[0024] Figure 2 for Figure 1 Middle AA section view;

[0025] Figure 3 An exploded view of the pressure-maintaining testing machine provided by the utility model at a second viewing angle;

[0026] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0027] Figure 5 for Figure 3 Enlarged view of point C in the middle;

[0028] Figure 6 An exploded view of the pressure-maintaining testing machine provided by the utility model at a third viewing angle;

[0029] Figure 7 A schematic diagram of the partial structure of the pressure-maintaining testing machine provided by the utility model;

[0030] Figure 8 A schematic diagram of the structure of the limit assembly provided by the utility model;

[0031] Fig. 9 A schematic diagram of the structure of the pressure-maintaining testing machine provided by the utility model at a fourth viewing angle;

[0032] Fig.10 A schematic diagram of the structure of the pressure-maintaining testing machine provided by the utility model at a third viewing angle;

[0033] Fig.11 A schematic diagram of the structure of the air purification component provided by the utility model;

[0034] Fig.12 A schematic diagram of the structure of the exhaust valve assembly provided by the utility model at a fourth viewing angle;

[0035] Fig.13 A schematic diagram of the structure of the exhaust valve assembly provided by the utility model at a fifth viewing angle;

[0036] Fig.14 This is a schematic structural diagram of the pressure-maintaining testing machine provided by the utility model at the fifth viewing angle.

[0037] Description of reference numerals:

[0038] 1. Workbench; 2. Test assembly; 3. Fixing assembly; 4. Driving part; 5. Limiting assembly; 501. Bottom plate; 502. Telescopic part; 503. Fastening claw; 504. Fastening part; 505. Adjusting screw; 506. Adjusting nut; 6. Limiting part; 7. Air purification assembly; 8. Exhaust valve assembly; 801. Mounting bracket; 802. Ball valve; 9. Cooling fan; 10. Filter element. DETAILED DESCRIPTION

[0039] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] See also Figures 1 to 14 The present embodiment provides a pressure-maintaining testing machine, comprising: a workbench 1; a test assembly 2, which is arranged on the workbench 1 and is suitable for accommodating a filter element 10; a fixing assembly 3, which is movably arranged on the workbench 1 along the vertical direction and is located above the test assembly 2; the fixing assembly 3 has a function of being driven by a driving member 4 to move downward in the vertical direction to a test state in which the filter element 10 is fixed, and to move upward to a separation state spaced apart from the filter element 10; a limiting assembly 5, which is arranged on the workbench 1; the adjusting end of the limiting assembly 5 has a function of being adjusted to a limiting state in which the fixing assembly 3 is downwardly abutted against the fixing assembly 3 when the fixing assembly 3 is in the test state, and to be adjusted to an installation state in which the fixing assembly 3 is away from the fixing assembly 3.

[0045] It should be noted that the test assembly 2 is connected to an external air source device for testing to provide compressed air for testing.

[0046] In this embodiment, when it is necessary to perform a pressure test on the filter element 10, the fixing component 3 is driven upward by the driving member 4 to move to a preset distance from the test component 2, that is, the fixing component 3 is in a separated state, and then the filter element 10 to be tested is placed in the test component 2, and then the fixing component 3 is driven downward by the driving member 4 to fix the filter element 10 for testing, that is, the fixing component 3 is in a testing state. At this time, the adjusting end of the adjusting limit component 5 is downwardly abutted against the fixing component 3 to limit the fixing component 3 in the vertical direction, and the fixing component 3 is further fixed, and then compressed air can be introduced to perform a pressure test on the filter element 10. The pressure-maintaining testing machine provided in the present embodiment limits the fixing component 3 by setting a limit component 5, thereby improving the stability of the fixing component 3 in fixing the filter element 10, making the fixing of the filter element 10 more firmly and avoiding the situation where the fixing component 3 cannot be pressed down due to excessive pressure. At the same time, the pressure range for testing the filter element 10 can be increased, so that the test can be performed within a higher pressure value, which can meet the test of the filter element 10 under high-pressure conditions, improve the test effect, and ensure the stability during the test.

[0047] Example 2

[0048] As a further improvement to Example 1, Figures 2 to 8 As shown, a limiting portion 6 is provided on the fixing component 3; the limiting component 5 includes a base plate 501, a telescopic member 502 and a fastening hook claw 503; the base plate 501 is arranged on the workbench 1; one end of the fastening hook claw 503 is hinged to the base plate 501, and the other end is provided with a fastening portion 504 facing the side of the fixing component 3, which is suitable for the limiting portion 6 to be abutted downward by the fastening portion 504 to be limited; one end of the telescopic member 502 is hinged to the base plate 501, and the other end is hinged to one end of the fastening hook claw 503 having the fastening portion 504, which is suitable for controlling the fastening hook claw 503 to rotate on the base plate 501 by telescopic control; when the limiting component 5 is in the limiting state, the fastening hook claw 503 rotates until the fastening portion 504 abuts downward against the limiting portion 6; when the limiting component 5 is in the installation state, the fastening hook claw 503 rotates until the fastening portion 504 is away from the limiting portion 6.

[0049] It should be noted that the bottom plate 501 , the telescopic member 502 and the fastening hook 503 are arranged in a triangle.

[0050] In this embodiment, when the fixing component 3 moves downward to fix the filter element 10, the length of the telescopic member 502 is adjusted to extend, so that the telescopic member 502 pushes the fastening hook claw 503 to rotate toward one side of the fixing component 3 until the fastening portion 504 downwardly abuts against the limiting portion 6 for limiting; conversely, when the test is completed, the length of the telescopic member 502 is adjusted to shorten, so that the telescopic member 502 pulls the fastening hook claw 503 to rotate toward the side away from the fixing component 3 until the fastening portion 504 is away from the limiting portion 6, so as to avoid affecting the upward movement of the fixing component 3 to install the filter element 10 or remove the filter element 10; at the same time, according to the height of the limiting portion 6, by controlling the rotation angle of the fastening hook claw 503 to abut against the limiting portion 6, it can adapt to limiting portions 6 of different heights, and has a wide range of applications.

[0051] Based on the above implementation, in a preferred implementation, Figure 8 As shown, the telescopic member 502 is a cylinder, the cylinder is hinged to the bottom plate 501, and the output shaft of the cylinder is hinged to one end of the fastening claw 503 having a fastening portion 504.

[0052] In this embodiment, the telescopic member 502 may be a cylinder, and the tightening claw 503 is controlled to rotate toward the fixing component 3 or toward a side away from the fixing component 3 by adjusting the extension and retraction of the output shaft of the cylinder.

[0053] As a convertible embodiment, the telescopic member 502 may be an electric telescopic rod or a hydraulic cylinder. The telescopic length is controlled to drive the fastening hook 503 to rotate, so as to control the fastening hook 503 to rotate toward the fixing assembly 3 or to rotate toward a side away from the fixing assembly 3.

[0054] Based on the above implementation, in a preferred implementation, Figure 8 As shown, an adjusting screw 505 is slidably passed through the fastening portion 504 from the top to the bottom, and the adjusting screw 505 is threadedly matched with the fastening portion 504 ; the fastening portion 504 is downwardly abutted against the limiting portion 6 through the adjusting screw 505 .

[0055] In this embodiment, the fastening portion 504 is limited by abutting against the limiting portion 6 through the adjusting screw 505. When the limiting height of the limiting portion 6 is adjusted, since the adjusting screw 505 is threadedly matched with the fastening portion 504, the adjusting screw 505 can be rotated to change the length of the adjusting screw 505 passing through the fastening portion 504, thereby achieving adjustment of the limiting height of the limiting portion 6.

[0056] Specifically, a through hole is opened on the fastening portion 504 corresponding to the adjusting screw 505 , and an adjusting nut 506 is provided on the fastening portion 504 corresponding to the through hole. The adjusting screw 505 passes through the fastening portion 504 through the through hole and is threadedly connected with the adjusting nut 506 .

[0057] Based on the above implementation, in a preferred implementation, Figures 2 to 7 As shown, each set of fixing components 3 is correspondingly provided with a plurality of sets of limiting components 5 , and the plurality of sets of limiting components 5 are evenly arranged around the test component 2 .

[0058] In this embodiment, multiple groups of limit assemblies 5 are evenly arranged around the test assembly 2 to limit the fixing assembly 3 when the fixing assembly 3 fixes the filter element 10, thereby further improving its stability. The number of limit assemblies 5 can be set to 2, 3, 4 or more groups, which can be selected according to actual needs. In this embodiment, the number of limit assemblies 5 is preferably set to 2 groups.

[0059] Based on the above implementation, in a preferred implementation, Figure 3 , Figure 6 , Figure 7 , Fig. 9 , Fig.10 and Fig.11 As shown, the pressure-maintaining testing machine further includes an air purification component 7 , which is connected to the testing component 2 , and the testing component 2 is suitable for being connected to an external air source device through the air purification component 7 .

[0060] In this embodiment, by providing an air purification component 7, the test component 2 is connected to an external air source device through the air purification component 7 so as to filter and purify the compressed air entering the test component 2, so that impurities such as solid particles, liquid droplets and oil stains will not enter the pneumatic system, thereby maintaining the stability and normal operation of the air path and preventing the interior of the filter element 10 from being polluted.

[0061] Based on the above implementation, in a preferred implementation, Fig.11 As shown, the air purification component 7 includes at least one of a water removal filter, an oil removal filter and an activated carbon filter.

[0062] In this embodiment, the air purification component 7 includes at least one of a water removal filter, an oil removal filter and an activated carbon filter, so as to filter and purify the compressed air entering the test component 2, so that impurities such as solid particles, liquid droplets and oil stains will not enter the pneumatic system, maintain the stability and normal operation of the air path, and will not pollute the interior of the filter element 10.

[0063] Based on the above implementation, in a preferred implementation, Figure 2 , Fig.12 and Fig.13 As shown, the pressure-maintaining test machine further includes an exhaust valve assembly 8 , which is connected to the test assembly 2 and is suitable for controlling the exhaust of the airflow in the test assembly 2 .

[0064] In this embodiment, by providing the exhaust valve assembly 8, after the test is completed, the exhaust valve assembly 8 is opened to exhaust gas for gas circulation treatment, so that some dust impurities are effectively discharged and the cleanliness inside the filter element 10 is improved.

[0065] Based on the above implementation, in a preferred implementation, Figure 2 , Fig.12 and Fig.13 As shown, the exhaust valve assembly 8 includes a mounting frame 801 and at least one ball valve 802 . The mounting frame 801 is disposed on the workbench 1 , and the ball valve 802 is connected to the test assembly 2 .

[0066] In this embodiment, the ball valve 802 is provided to control the connection and disconnection between the test component 2 and the outside, so that after the test is completed, the ball valve 802 is opened to exhaust gas for gas circulation treatment, so that some dust impurities are effectively discharged and the internal cleanliness of the filter element 10 is improved.

[0067] Based on the above implementation, in a preferred implementation, Figure 1 As shown, an air outlet communicating with the interior of the workbench 1 is provided on the peripheral side thereof, and a heat dissipation fan 9 is provided at the air outlet.

[0068] In this embodiment, a cooling fan 9 is provided on the workbench 1 to dissipate heat, thereby lowering the working temperature and ensuring stable operation of the internal equipment of the workbench 1.

[0069] Based on the above embodiment, in a preferred embodiment, a position detection component is provided at the output end of the driving member 4, and the position detection component is communicatively connected with the driving member 4 and the limit assembly 5, and is suitable for detecting the moving distance of the fixing assembly 3 through the position detection component.

[0070] It should be noted that the position detection components are communicatively connected with the driving component 4 and the limit assembly 5 .

[0071] In this embodiment, the moving distance of the output end of the driving member 4 is detected by the position detection member, and then the moving distance of the fixing component 3 is obtained to determine whether the fixing component 3 presses down the filter element 10 into place. When it is not in place, the fixing component 3 is further pressed down by controlling the driving member 4 and the limiting component 5 to press the filter element 10 into place to ensure sealing, which is convenient for detection.

[0072] Specifically, the position detection element may be a photoelectric sensor or an ultrasonic sensor.

[0073] Specifically, the test assembly 2 includes a base, which is arranged on the workbench 1, and is provided with at least one accommodating cavity for accommodating the filter element 10; the accommodating cavity is connected to an external air source device, suitable for passing compressed air for pressure holding test; the fixing assembly 3 includes at least one shell; the output end of the driving member 4 is connected to the body-connectable shell, suitable for driving the shell to move in the vertical direction; one shell cooperates with one accommodating cavity to seal and fix one filter element 10. The number of shells can be determined according to actual conditions, and is suitable for cooperating with the accommodating cavity to seal and fix the filter element 10 for testing.

[0074] Specifically, the limiting portion 6 is connected to each housing.

[0075] Specifically, Figure 2 , Figure 3 , Figure 7 , Fig. 9 and Fig.14 As shown, there are multiple groups of test components 2, and the multiple groups of test components 2 are arranged side by side and at intervals on the workbench 1, and each group of test components 2 is correspondingly provided with a group of fixing components 3.

[0076] Specifically, Figure 2 As shown, the driving member 4 is located above the test assembly 2 . The driving member 4 is a cylinder or a hydraulic cylinder. The output shaft of the cylinder or the hydraulic cylinder is vertically arranged downward and is connected to the fixing assembly 3 .

[0077] Specifically, the pressure-maintaining testing machine also includes a control component, which is in communication with the driving component 4, the fixing component 3, the testing component 2 and the limiting component 5 for easy control; the control component can be selected as a control panel or a computer control device.

[0078] The specific working principle of the pressure-maintaining test machine provided in this embodiment is as follows: when it is necessary to perform a pressure-maintaining test on the filter element 10, the fixing assembly 3 is driven upward by the driving member 4 to move to a preset distance from the test assembly 2, that is, the fixing assembly 3 is in a separated state, and then the filter element 10 to be tested is placed in the test assembly 2, and then the fixing assembly 3 is driven downward by the driving member 4 to fix the filter element 10 for testing, that is, the fixing assembly 3 is in a testing state. At this time, the length of the screw 505 penetrating the fastening portion 504 is adjusted according to the limit height, and then the length of the telescopic member 502 is adjusted to extend, so that the telescopic member 502 pushes the fastening hook claw 503 to rotate toward one side of the fixing assembly 3 until the fastening portion 504 is passed. The adjusting screw 505 is downwardly abutted against the limit part 6 for limiting, so as to limit the fixing component 3 in the vertical direction and further fix the fixing component 3. Then the external air source equipment can filter the compressed air through the air purification component 7 and then pass it into the test component 2 to perform a pressure test on the filter element 10. After the test is completed, the gas is circulated by opening the ball valve 802 to exhaust and effectively discharge some dust impurities to improve the internal cleanliness of the filter element 10. Then the length of the telescopic part 502 is adjusted to be shortened so that the telescopic part 502 pulls the fastening claw 503 to rotate toward the side away from the fixing component 3 until the fastening part 504 is away from the limit part 6, so as to avoid affecting the upward movement of the fixing component 3 to disassemble the filter element 10. The pressure-maintaining test machine provided in this embodiment limits the fixing component 3 by setting the limiting component 5, thereby improving the stability of the fixing component 3 in fixing the filter element 10, making it more firmly fix the filter element 10, and avoiding the situation that the fixing component 3 cannot be pressed down due to excessive pressure. At the same time, the pressure range for testing the filter element 10 can be increased, so that it can be tested within a higher pressure value, which can meet the test of the filter element 10 under high pressure conditions, improve the test effect, and ensure the stability during the test process; in specific applications, the pressure-maintaining test machine provided in this embodiment can also test the filter element 10 under conditions where the pressure value is greater than 0.7MPa. It solves the technical problem that the fixing component 3 and the test component 2 in the existing pressure-maintaining test equipment have poor stability in fixing the filter element 10, and the cylinder is prone to fail to be pressed down under high pressure, which makes it difficult to meet the demand for testing the filter element 10 under high pressure conditions.

[0079] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A pressure-maintaining testing machine, characterized in that: include: Workbench (1); A test assembly (2), arranged on the workbench (1) and suitable for accommodating a filter element (10); A fixing assembly (3) is movably arranged on the workbench (1) in a vertical direction and is located above the test assembly (2); the fixing assembly (3) is driven by a driving member (4) to move downward in a vertical direction to a test state in which the filter element (10) is fixed, and to move upward to a separation state in which the filter element (10) is spaced apart. A limit assembly (5) is arranged on the workbench (1); the adjustment end of the limit assembly (5) has a limit state that is adjusted to downwardly abut against the fixing assembly (3) when the fixing assembly (3) is in a testing state, and a mounting state that is adjusted to be away from the fixing assembly (3).

2. The pressure-maintaining testing machine according to claim 1, characterized in that: The fixing assembly (3) is provided with a limiting portion (6); the limiting assembly (5) comprises a base plate (501), a telescopic member (502) and a fastening hook (503); the base plate (501) is arranged on the workbench (1); one end of the fastening hook (503) is hinged to the base plate (501), and the other end is provided with a fastening portion (504) on a side facing the fixing assembly (3), and is suitable for abutting the limiting portion (6) downwards through the fastening portion (504) to limit the position; one end of the telescopic member (502) is hinged to the base plate (501), and the other end is hinged to one end of the fastening hook (503) having the fastening portion (504), and is suitable for controlling the fastening hook (503) to rotate on the base plate (501) by telescopic control; when the limiting assembly (5) is in the limiting state, the fastening hook (503) rotates until the fastening portion (504) downwardly abuts against the limiting portion (6); when the limiting assembly (5) is in the installation state, the fastening hook (503) rotates until the fastening portion (504) is away from the limiting portion (6).

3. The pressure-maintaining testing machine according to claim 2, characterized in that: The telescopic member (502) is a cylinder, the cylinder is hinged to the bottom plate (501), and the output shaft of the cylinder is hinged to one end of the fastening hook (503) having the fastening portion (504).

4. The pressure-maintaining testing machine according to claim 2, characterized in that: An adjusting screw (505) is slidably inserted through the fastening portion (504) from the top to the bottom, and the adjusting screw (505) is threadedly matched with the fastening portion (504); the fastening portion (504) is downwardly abutted against the limiting portion (6) through the adjusting screw (505).

5. The pressure-maintaining testing machine according to any one of claims 1 to 4, characterized in that: Each group of the fixing components (3) is provided with a plurality of groups of the limiting components (5) in correspondence, and the plurality of groups of the limiting components (5) are evenly arranged around the periphery of the testing component (2).

6. The pressure-maintaining testing machine according to claim 1, characterized in that: It also comprises an air purification component (7), wherein the air purification component (7) is connected to the test component (2), and the test component (2) is suitable for being connected to an external air source device through the air purification component (7).

7. The pressure-maintaining testing machine according to claim 6, characterized in that: The air purification component (7) comprises at least one of a water removal filter, an oil removal filter and an activated carbon filter.

8. The pressure-maintaining testing machine according to claim 1, characterized in that: It also comprises an exhaust valve assembly (8), wherein the exhaust valve assembly (8) is connected to the test assembly (2) and is suitable for controlling the exhaust of the airflow in the test assembly (2).

9. The pressure-maintaining testing machine according to claim 8, characterized in that: The exhaust valve assembly (8) comprises a mounting frame (801) and at least one ball valve (802); the mounting frame (801) is arranged on the workbench (1); and the ball valve (802) is arranged in communication with the test assembly (2).

10. The pressure-maintaining testing machine according to claim 1, characterized in that: An air outlet communicating with the interior of the workbench (1) is provided on the peripheral side thereof, and a cooling fan (9) is provided at the air outlet; And / or, a position detection component is provided at the output end of the driving component (4), and the position detection component is communicatively connected with the driving component (4) and the limit component (5), and is suitable for detecting the moving distance of the fixing component (3) through the position detection component.

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