A gas mask airtightness testing device

Abstract

This invention discloses a gas mask airtightness testing device, including a workbench and a PLC panel installed on the front surface of the workbench. A testing mechanism and a dust cover are also installed on the upper part of the workbench, with the testing mechanism located inside the dust cover. This invention selects a qualified airtightness filter canister as a benchmark, obtains benchmark values ​​for both positive and negative pressure testing of the canister, and stores these benchmark values ​​in the PLC panel. By testing the filter canister under identical conditions, if the data obtained from the positive and negative pressure tests are significantly greater than the benchmark values ​​when compared through the PLC panel, the airtightness of the tested filter canister is determined to be unqualified. This eliminates the need for complex absolute leakage rate calculations and unit conversions, and the testing equipment is low-cost, enabling the detection of leaking filter canisters on-site or in rapid screening, thus improving testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of gas mask testing, and in particular to a gas mask airtightness testing device. Background Technology

[0002] Gas masks are personal protective equipment (PPE) and individual soldier protective gear. Worn on the head, they protect the respiratory organs, eyes, and face from toxic gases, dust, bacteria, and other harmful substances such as toxic gases or vapors. The filter canister is the core component of a gas mask and is a consumable. It is an independently replaceable part and can be damaged before use or after storage. A leaking filter canister can cause the entire gas mask to fail. Therefore, it is extremely important to individually inspect the filter canister of a gas mask.

[0003] A gas mask filter canister airtightness testing device, disclosed in CN219104272U, includes a frame assembly, a linear module, and a test piece. The frame assembly includes three movable joints along the X, Y, and Z axes, driven by the linear module. The test piece is connected to the frame assembly and moves linearly along the X, Y, and Z axes to perform airtightness testing on the filter canister. A detection element is also included, used to perform airtightness testing in conjunction with the test piece. The frame assembly includes a first frame, a second frame, and a third frame. This invention uses the frame assembly and linear module to perform airtightness testing on the filter canister before assembly and off-line testing, and to perform omnidirectional angle adaptation testing at any air intake position. This effectively simulates the air intake effect testing of the filter canister under different usage environments, thereby achieving effective process airtightness quality control and ensuring the finished product yield.

[0004] The above-disclosed technical solutions have the following shortcomings: the operation of airtight testing of the filter canister on the gas mask is very complicated, the testing equipment is expensive, and it is impossible to detect leaking filter canisters on the production site or in rapid screening, which reduces the testing efficiency. In addition, the filter canister is clamped by a three-jaw chuck during the testing process, and excessive clamping force can easily cause the filter canister to deform and be damaged. Utility Model Content

[0005] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a gas mask airtightness testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a gas mask airtightness testing device, including a workbench and a PLC panel installed on the front surface of the workbench, wherein a testing mechanism and a dust cover are also installed on the upper end of the workbench, and the testing mechanism is located inside the dust cover;

[0007] The testing mechanism includes a placement base, a filter canister, a multi-functional air pump, and a conduit. The placement base is installed on the upper surface of the workbench, and the lower end of the filter canister is inserted into the connection port of the gas mask and installed inside the sealing ring set in the middle of the placement base. The multi-functional air pump is installed inside the workbench and is electrically connected to the PLC panel. The upper end of the multi-functional air pump is connected to the inside of the sealing ring through a conduit.

[0008] As a further embodiment of this utility model, the detection mechanism also includes an auxiliary mechanism, which consists of a support base, a support top plate, and a sealing mechanism. The upper end of the support base is fixed to the support top plate by bolts, and the sealing mechanism is installed in the middle of the support top plate.

[0009] As a further embodiment of this utility model, the sealing mechanism includes a cylinder, a lifting plate, a top spring, a linkage support plate, a magnetic block, and a sealing plate. The cylinder is installed in the middle of the upper part of the supporting top plate, and the cylinder output end passes through the middle of the upper part of the supporting top plate and is fixed to the lifting plate. The lifting plate is located below the supporting top plate, and the middle of the bottom of the lifting plate is welded to the top of the top spring. The upper part of the linkage support plate is shaft-connected to the bottom of the lifting plate, and the bottom of the linkage support plate is shaft-connected to the magnetic block, and the magnetic block is embedded inside the upper part of the sealing plate.

[0010] As a further embodiment of this utility model, a positioning tube is provided in the middle of the upper end of the sealing plate, the lower end of the top spring is located inside the positioning tube, and the lower end of the top spring abuts against the middle of the upper end of the sealing plate.

[0011] As a further embodiment of this utility model, a silicone plate is also installed inside the lower end of the sealing plate, and when the sealing plate descends, the silicone plate abuts against the air inlet at the upper end of the filter canister.

[0012] As a further embodiment of this utility model, a spring is also provided on the inner side of the support base, and a clamping mechanism is fixed to the inner end of the spring, with the inner end of the clamping mechanism installed inside the support base.

[0013] As a further embodiment of this utility model, the clamping mechanism includes a pressing rod, a central contact wheel, a swing plate, a torsion shaft, and a side contact wheel. The inner end of the pressing rod is installed inside the support base and is welded to the inner end of the spring. A central contact wheel is fixed in the middle of the inner end of the pressing rod. The middle of the pressing rod is hinged to one end of the swing plate via the torsion shaft, and the other end of the swing plate is axially connected to the side contact wheel.

[0014] Compared with the prior art, this utility model provides a gas mask airtightness detection device, which has the following beneficial effects:

[0015] 1. In this utility model, a filter canister with qualified airtightness is selected as a benchmark. The benchmark values ​​of the positive pressure method test and the negative pressure method test of the filter canister are obtained, and the benchmark data are stored in the PLC panel. By testing the filter canister under the same test conditions, if the data obtained by the positive pressure method test and the negative pressure method test are significantly greater than the benchmark value through comparison on the PLC panel, the airtightness of the tested filter canister can be determined to be unqualified. There is no need for complicated absolute leakage rate calculation and unit conversion. Moreover, the testing equipment has low cost and can detect leaking filter canisters on the production site or in rapid screening, thus improving the testing efficiency.

[0016] 2. In this utility model, the silicone plate is soft and easily compressed and deformed. When the sealing plate presses the silicone plate against the air inlet interface of the filter canister, the silicone plate can fit well against the uneven surface of the air inlet of the filter canister, fill the tiny gaps, and form an effective seal, thereby improving the sealing effect of the air inlet of the filter canister and improving the accuracy of the air tightness test of the filter canister.

[0017] 3. In this utility model, the torsion shaft applies elastic force to make the side contact wheel and the center contact wheel contact and clamp the filter canister, which can avoid excessive clamping and damage to the filter canister. Furthermore, by applying equal elastic force through the two sets of clamping mechanisms, the filter canister is stably clamped in the center directly below the sealing mechanism, ensuring the accuracy of the sealing and the stability during the airtightness test of the filter canister. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the three-dimensional disassembled structure of the testing mechanism of this utility model;

[0020] Figure 3 This is a three-dimensional structural diagram of the auxiliary mechanism of this utility model;

[0021] Figure 4 This is a three-dimensional structural diagram of the sealing mechanism of this utility model;

[0022] Figure 5 This is a three-dimensional bottom view of the sealing plate structure of this utility model;

[0023] Figure 6 This is a top view schematic diagram of the support structure of this utility model;

[0024] Figure 7 This is a top view of the clamping mechanism of this utility model.

[0025] The components include: workbench-1, PLC panel-2, detection mechanism-3, placement seat-31, sealing ring-311, filter canister-32, multi-functional air pump-33, conduit-34, auxiliary mechanism-35, support seat-351, spring-3511, clamping mechanism-3512, extrusion rod-5121, center contact wheel-5122, swing plate-5123, torsion shaft-5124, side contact wheel-5125, support top plate-352, sealing mechanism-353, cylinder-3531, lifting plate-3532, top spring-3533, linkage support plate-3534, magnetic block-3535, sealing plate-3536, silicone plate-5361, positioning tube-3537, and dust cover-4. Detailed Implementation

[0026] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0027] Please see Figure 1-2 A gas mask airtightness testing device includes a workbench 1 and a PLC panel 2 installed on the front surface of the workbench 1. A testing mechanism 3 and a dust cover 4 are also installed on the upper end of the workbench 1, and the testing mechanism 3 is located inside the dust cover 4.

[0028] The testing mechanism 3 includes a placement base 31, a filter canister 32, a multi-functional air pump 33, and a conduit 34. The placement base 31 is installed on the upper surface of the workbench 1, and the lower end of the filter canister 32 is inserted into the connection port of the gas mask and installed inside the sealing ring 311 set in the middle of the placement base 31. The multi-functional air pump 33 is installed inside the workbench 1 and is electrically connected to the PLC panel 2. The upper end of the multi-functional air pump 33 is connected to the inside of the sealing ring 311 through the conduit 34.

[0029] It should be further explained that the core of the multi-functional air pump 33 is a piston or turbine driven by an electric motor. The motor rotates, driving the piston to reciprocate, thereby generating airflow. The multi-functional air pump 33 has an inflation mode and an exhaust mode. In the inflation mode, the motor rotates forward, drawing in external air into the pump body, then compressing and pushing it towards the outlet, through the conduit 34 and the sealing ring 311, and discharging it into the filter canister 32, filling the filter canister 32 with gas at a certain pressure, which is the pressure value measured by the positive pressure method. In the exhaust mode, the motor rotates in reverse, drawing air out of the filter canister 32 to create a certain negative pressure, which is then pushed towards the exhaust port of the pump body and discharged into the outside atmosphere, which is the pressure value measured by the negative pressure method.

[0030] In this embodiment: a qualified airtightness filter canister 32 is selected as a benchmark. The benchmark values ​​of the positive pressure test and the negative pressure test of the filter canister 32 are obtained, and the benchmark data are stored in the PLC panel 2. By testing the filter canister 32 under exactly the same test conditions, if the data obtained by the positive pressure test and the negative pressure test are significantly greater than the benchmark value when compared through the PLC panel 2, the airtightness of the tested filter canister 32 can be determined to be unqualified. Conversely, if the data is the same as or close to the benchmark value, the airtightness of the tested filter canister 32 can be determined to be qualified. The judgment criteria for data comparison here are common technical knowledge in the field and will not be elaborated here. This measurement only requires data detection and comparison through the multi-functional air pump 33 and the PLC panel 2. There is no need for complicated absolute leakage rate calculation and unit conversion. Moreover, the detection equipment has low cost and can detect leaking filter canisters in the production site or in rapid screening, thus improving detection efficiency.

[0031] Please refer to 3-7. The testing mechanism 3 also includes an auxiliary mechanism 35. The auxiliary mechanism 35 consists of a support base 351, a support top plate 352, and a sealing mechanism 353. The upper end of the support base 351 is fixed to the support top plate 352 by bolts, and the sealing mechanism 353 is installed in the middle of the support top plate 352.

[0032] The sealing mechanism 353 includes a cylinder 3531, a lifting plate 3532, a top spring 3533, a linkage support plate 3534, a magnetic block 3535, and a sealing plate 3536. The cylinder 3531 is installed in the middle of the upper end of the supporting top plate 352, and the output end of the cylinder 3531 passes through the middle of the upper end of the supporting top plate 352 and is fixed to the lifting plate 3532. The lifting plate 3532 is located below the supporting top plate 352, and the middle of the bottom of the lifting plate 3532 is welded to the top of the top spring 3533. The upper end of the linkage support plate 3534 is shaft-connected to the bottom of the lifting plate 3532, and the bottom of the linkage support plate 3534 is shaft-connected to the magnetic block 3535. The magnetic block 3535 is embedded in the upper end of the sealing plate 3536.

[0033] A positioning tube 3537 is provided in the middle of the upper end of the sealing plate 3536, and the lower end of the top spring 3533 is located inside the positioning tube 3537, and the lower end of the top spring 3533 abuts against the middle of the upper end of the sealing plate 3536.

[0034] A silicone plate 5361 is also installed inside the lower end of the sealing plate 3536, and when the sealing plate 3536 descends, the silicone plate 5361 abuts against the air inlet at the upper end of the filter canister 32.

[0035] It should be further explained that there are two sets of linkage support plates 3534, and each set has two linkage support plates 3534. The two linkage support plates 3534 in each set are connected by a shaft to form a "V" structure. The two sets of linkage support plates 3534 are located on the left and right sides of the top spring 3533. Under the elastic linkage of the two sets of linkage support plates 3534 and top spring 3533, when the cylinder 3531 drives the sealing plate 3536 to descend and seal the upper air inlet of the filter canister 32, it can provide a certain elastic buffer for the filter canister 32, so as to avoid the filter canister 32 being subjected to large resistance pressure and deforming, which would damage the filter canister 32.

[0036] Furthermore, the silicone plate 5361 is soft and easily compressed and deformed. When the sealing plate 3536 pushes the silicone plate 5361 to press against the air inlet interface of the filter canister 32, the silicone plate 5361 can fit well against the uneven surface of the air inlet of the filter canister 32, fill the tiny gaps, and form an effective seal, thereby improving the sealing effect of the air inlet of the filter canister 32 and improving the accuracy of the air tightness test of the filter canister 32.

[0037] A spring 3511 is also provided inside the support base 351, and a clamping mechanism 3512 is fixed to the inner end of the spring 3511. The inner end of the clamping mechanism 3512 is installed inside the support base 351.

[0038] The clamping mechanism 3512 includes a pressing rod 5121, a central contact wheel 5122, a swing plate 5123, a torsion shaft 5124, and a side contact wheel 5125. The inner end of the pressing rod 5121 is installed inside the support base 351, and the inner end of the pressing rod 5121 is welded to the inner end of the spring 3511. The central contact wheel 5122 is fixed in the middle of the inner end of the pressing rod 5121. The middle of the pressing rod 5121 is hinged to one end of the swing plate 5123 through the torsion shaft 5124, and the other end of the swing plate 5123 is axially connected to the side contact wheel 5125.

[0039] It should be noted that the two support bases 351 are installed symmetrically from left to right, and a clamping mechanism 3512 is installed between the inner sides of the two support bases 351 to clamp and fix the filter canister 32 on the left and right sides.

[0040] Each set of compression rods 5121 is equipped with two swing plates 5123, a torque shaft 5124, and side contact wheels 5125. Under the elastic torque applied by the torque shaft 5124 to the swing plates 5123, the two side contact wheels 5125 can be adjusted to follow the filter canisters 32 of different diameters, ensuring that the two side contact wheels 5125 and the center contact wheel 5122 abut against the middle and the two sides of the outer surface of the filter canister 32. The elastic force applied by the torque shaft 5124 causes the side contact wheels 5125 and the center contact wheel 5122 to abut against and clamp the filter canister 32, which can avoid over-clamping and damage to the filter canister 32. Furthermore, by applying equal elastic clamping force through the two sets of clamping mechanisms 3512, the filter canister 32 is stably and centrally clamped directly below the sealing mechanism 353, ensuring the accuracy of the sealing and the stability of the filter canister 32 during the airtightness test.

[0041] refer to Figures 1-7 In use, the lower end of the filter canister 32 is inserted into the connection port of the gas mask and installed inside the sealing ring 311. The filter canister 32 is clamped by the center contact wheel 5122 and the side contact wheel 5125, and the filter canister 32 is stably installed on the placement seat 31. Then, the lifting plate 3532 is lowered by the starting cylinder 3531, so that the sealing plate 3536 seals the air inlet at the upper end of the filter canister 32.

[0042] Next, the multi-functional air pump 33 is started via PLC panel 2 to enter the inflation mode, delivering air pressure into the filter canister 32. The positive pressure test value displayed on PLC panel 2 is compared with the reference value. Then, the multi-functional air pump 33 is started via PLC panel 2 to enter the evacuation mode, and the negative pressure test value displayed on PLC panel 2 is compared with the reference value. This allows it to be determined whether the air tightness of the filter canister 32 under test is qualified, thus quickly performing an air tightness test on the filter canister 32.

[0043] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0044] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0045] The above description is merely 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 gas mask airtightness testing device, comprising a workbench (1) and a PLC panel (2) installed on the front surface of the workbench (1), wherein a testing mechanism (3) and a dust cover (4) are also installed on the upper end of the workbench (1), and the testing mechanism (3) is located inside the dust cover (4); characterized in that The testing mechanism (3) includes a placement seat (31), a filter canister (32), a multi-functional air pump (33), and a conduit (34). The placement seat (31) is installed on the upper surface of the workbench (1), and the lower end of the filter canister (32) is inserted into the connection port of the gas mask and installed inside the sealing ring (311) set in the middle of the placement seat (31). The multi-functional air pump (33) is installed inside the workbench (1) and is electrically connected to the PLC panel (2). The upper end of the multi-functional air pump (33) is connected to the inside of the sealing ring (311) through the conduit (34).

2. The device for testing the air tightness of a gas mask according to claim 1, characterized in that: The detection mechanism (3) also includes an auxiliary mechanism (35), which consists of a support base (351), a support top plate (352), and a sealing mechanism (353). The upper end of the support base (351) is fixed to the support top plate (352) by bolts, and the sealing mechanism (353) is installed in the middle of the support top plate (352).

3. The device for testing the air tightness of a gas mask according to claim 2, characterized in that: The sealing mechanism (353) includes a cylinder (3531), a lifting plate (3532), a top spring (3533), a linkage support plate (3534), a magnetic block (3535), and a sealing plate (3536). The cylinder (3531) is installed in the middle of the upper end of the supporting top plate (352), and the output end of the cylinder (3531) passes through the middle of the upper end of the supporting top plate (352) and is fixed to the lifting plate (3532). The lifting plate (3532) is located below the supporting top plate (352), and the middle of the bottom of the lifting plate (3532) is welded to the top of the top spring (3533). The upper end of the linkage support plate (3534) is axially connected to the bottom of the lifting plate (3532), and the bottom of the linkage support plate (3534) is axially connected to the magnetic block (3535). The magnetic block (3535) is embedded in the upper end of the sealing plate (3536).

4. The device for testing the air tightness of a gas mask according to claim 3, characterized in that: The sealing plate (3536) has a positioning tube (3537) at the middle of its upper end, and the lower end of the top spring (3533) is located inside the positioning tube (3537), and the lower end of the top spring (3533) abuts against the middle of the upper end of the sealing plate (3536).

5. The device for testing the air tightness of a gas mask according to claim 4, characterized in that: A silicone plate (5361) is also installed inside the lower end of the sealing plate (3536), and when the sealing plate (3536) descends, the silicone plate (5361) abuts against the air inlet at the upper end of the filter canister (32).

6. The device for testing the air tightness of a gas mask according to claim 2, characterized in that: A spring (3511) is also provided on the inner side of the support base (351), and a clamping mechanism (3512) is fixed on the inner end of the spring (3511). The inner end of the clamping mechanism (3512) is installed inside the support base (351).

7. The device of claim 6, wherein: The clamping mechanism (3512) includes a pressing rod (5121), a central contact wheel (5122), a swing plate (5123), a torsion shaft (5124), and a side contact wheel (5125). The inner end of the pressing rod (5121) is installed inside the support base (351), and the inner end of the pressing rod (5121) is welded to the inner end of the spring (3511). The central contact wheel (5122) is fixed in the middle of the inner end of the pressing rod (5121). The middle part of the pressing rod (5121) is hinged to one end of the swing plate (5123) through the torsion shaft (5124), and the other end of the swing plate (5123) is axially connected to the side contact wheel (5125).

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