A test laser welding plastic tightness pressure resistance test system

Abstract

The utility model provides a kind of test laser welding plastic tightness pressure resistance test system, including tightness test unit, tightness test unit includes test gas path, test gas path is equipped with gas source, gas pressurizing device and on-off control device and test sample in turn along airflow direction, and the end of test gas path is connected with test sample by locking assembly.The utility model is through setting gas pressurizing device and on-off control device, test sample locking assembly etc., not only simple structure easy to install, and low in cost;Through setting locking assembly makes the connection installation of test sample convenient and fast, can be completed in short time when maintaining disassembly work;The utility model is simple in operation, convenient, greatly shorten the time of test, improve test work efficiency, satisfy the demand of test sample, namely plastic welding product batch type test.

Description

Technical Field

[0001] This utility model relates to the field of sealing test technology, and in particular to a sealing test device. Background Technology

[0002] As the use of plastic welding in industrial product design increases, the requirements for the pressure resistance of plastic welded seals are becoming increasingly stringent, and the application tests for sealing resistance and pressure resistance are becoming more rigorous. For these non-standard plastic welded seal products, especially those designed with specific enterprise requirements, there is currently no mature testing equipment on the market to meet the testing needs. A testing system needs to be designed to meet the sealing pressure resistance testing requirements while simultaneously fulfilling the customer's objectives before the product can be shipped to the customer.

[0003] Chinese invention application CN 111024380 A, published on April 17, 2020, discloses a pressure resistance testing system and method for airtight sleeves. The system includes a pressure regulating valve, an inlet valve, an exhaust valve, and a test chamber. The test chamber has an inlet and an exhaust port. The input of the pressure regulating valve is connected to a gas source, and its output is connected in series with the inlet valve and then to the inlet. The exhaust valve is connected to the exhaust port. The method involves placing the airtight sleeve inside the test chamber when needed, supplying gas using the system, adjusting the pressure regulating valve to maintain the gas pressure at a user-preset test pressure, and after a user-preset test time, opening the exhaust valve to release the gas from the test chamber and removing the airtight sleeve. However, this pressure resistance testing system is not suitable for testing the sealing and pressure resistance performance of welded plastic sealing products. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model proposes a pressure resistance testing system for testing the sealing performance of laser-welded plastics, thereby solving the problem of the lack of testing devices for the sealing performance of welded plastic products in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A pressure resistance testing system for laser-welded plastics includes a pressure resistance testing unit. The unit comprises a test gas path, along which a gas source, a gas pressurization device, an on / off control device, and a test sample are sequentially arranged. The end of the test gas path is connected to the test sample via a locking assembly. This invention, by incorporating a gas source, gas pressurization device, on / off control device, and test sample locking assembly for pressure resistance testing, is not only simple in structure and easy to install, but also low in cost. The locking assembly facilitates quick and easy connection and installation between the test sample and the test gas path, allowing for rapid disassembly during maintenance. Furthermore, this invention is simple and convenient to operate, significantly reducing testing time and improving testing efficiency, thus meeting the needs of batch testing of welded plastic products.

[0006] Furthermore, the end of the test air path is provided with an air guide tube with external threads. The locking assembly includes a long nut threadedly connected to the air guide tube, a tension sealing ring sleeve fitted on the air guide tube, a tension clamp-type sealing ring clamped on the tension sealing ring sleeve, and a first nut threadedly connected to the end of the air guide tube. The air guide tube passes through the shell of the test sample so that the first nut and the long nut are located on the inner and outer sides of the test sample, respectively, and the tension sealing ring sleeve, the tension clamp-type sealing ring, and the shell wall of the test sample are clamped between the first nut and the long nut.

[0007] Furthermore, the tension sealing ring gasket includes a cylindrical section and an annular plate disposed at one end of the cylindrical section. The cylindrical section passes through the test sample, and the annular plate abuts against the outer side of the test sample's shell.

[0008] Furthermore, a pressure gauge is also installed in the test air circuit, and the pressure gauge is located between the on / off control device and the test sample.

[0009] Furthermore, it also includes a gas control unit, which is connected to the gas booster and the on / off control device, and is used to control the start and stop of the gas booster and the on / off state of the on / off control device.

[0010] Furthermore, the gas booster device is a pneumatic booster pump; the on / off control device is a pneumatic control valve.

[0011] Furthermore, the pneumatic control unit includes a pneumatic control source, which is connected to a pneumatic booster pump and a pneumatic control valve respectively via a valve island.

[0012] Furthermore, the pneumatic control source includes an air compressor and a pneumatic dual unit connected to the air compressor.

[0013] Furthermore, an air storage tank is installed between the air compressor and the pneumatic dual unit.

[0014] Furthermore, the sealing test unit also includes a test container for placing test samples, the test container having a placement inlet and a lockable door panel on the placement inlet.

[0015] The beneficial effects of this utility model are: 1. This utility model, by setting up a booster pump, control valve, digital display pressure gauge, test sample locking assembly, safety test container, air pipe, etc., not only has a simple structure and is easy to install, but also has low cost; 2. This utility model makes the connection and installation of test samples convenient and quick by setting a locking component, and the disassembly work can be completed within 1 minute during maintenance; 3. This utility model achieves test sequence by setting up a pneumatic control unit to coordinate the control of key components in the test pneumatic circuit and eliminates human error. 4. This utility model is simple and convenient to operate, greatly shortens the testing time, improves the efficiency of testing work, and meets the needs of batch testing; 5. The locking component of this utility model can be flexibly customized, is easy to operate, and can be widely used in the testing of the sealing performance and pressure resistance of welded plastic materials. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the locking assembly of this utility model; Figure 3 This is a schematic diagram of the structure of the tension sealing ring gasket of this utility model; Figure 4 This is a schematic diagram of the tension clamp-type sealing ring of this utility model.

[0018] In the diagram: 1. Air source, 2. Air pipe, 3. Booster pump, 4. Control valve, 5. Digital pressure gauge, 6. Test container, 7. Locking assembly, 71. First nut, 72. Tensioning clamp seal, 73. Tensioning seal gasket, 74. Long nut, 8. Valve island, 9. Pneumatic dual unit, 10. Air tank, 11. Air compressor, 12. Test sample, 13. Air guide pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1 As shown in Embodiment 1 of this utility model, a pressure resistance testing system for testing the sealing performance of laser-welded plastics includes a sealing performance testing unit. The sealing performance testing unit includes a test gas path. Along the airflow direction, the test gas path is sequentially equipped with a gas source 1, a gas pressurization device, an on / off control device, and a test sample 12. The end of the test gas path is connected to the test sample 12 via a locking assembly 7. Specifically, the gas source 1 is connected to the gas pressurization device via a gas pipe 2, and the gas pressurization device is connected to the on / off control device via a gas pipe 2. Finally, the end of the test gas path is connected to the test sample 12, i.e., the plastic seal, via the locking assembly 7. Before welding, a perforation is provided in the center of the bottom groove of the test sample 12. In this embodiment, the radius of the perforation R = 10 mm. The end of the test gas path is fixedly installed in the perforation in the center of the bottom groove of the test sample 12 via the locking assembly 7. Then, the cover of the test sample 12 is fastened before laser welding. After welding, air is supplied to test the test sample 12. This testing device is simple to operate, convenient and quick to test, and provides accurate and reliable data, meeting the requirements for pressure resistance testing after laser welding of plastics.

[0021] Furthermore, in this embodiment, the gas booster device is a pneumatic booster pump 3; the on / off control device is a pneumatic control valve 4. In a preferred embodiment, the pneumatic control valve 4 is a two-position three-way valve.

[0022] Example 2 differs from Example 1 in that, as Figure 1 As shown, the sealing test unit also includes a test container 6 for placing the test sample 12. The test container 6 has a placement inlet with a lockable door. After welding, the test sample 1 is placed in the sealed test container for testing. The test container ensures the safety of surrounding personnel and materials, preventing damage to surrounding personnel and materials should the test sample 1 burst open in extreme circumstances.

[0023] Example 3 differs from Example 2 in that, as Figure 1 As shown, a pressure gauge 5 is also provided in the test air circuit, and the pressure gauge 5 is located between the on / off control device and the test sample 12. In this embodiment, the pressure gauge 5 is a digital display pressure gauge. During the test, the peak value on the pressure gauge 5 is recorded, which is the maximum pressure that the test sample 12, i.e., the plastic welded sample, can withstand for sealing.

[0024] Example 4 differs from Example 1 in that, as Figure 2 As shown, the end of the test gas path is provided with a threaded gas guide tube 13. The locking assembly 7 includes a long nut 74, a tension sealing ring gasket 73, a tension clamp-type sealing ring 72, and a first nut 71. The long nut 74 is first threaded onto the gas guide tube 13, then the tension sealing ring gasket 73 is fitted onto it. The gas guide tube 13 is then passed through the shell wall of the test sample 12, simultaneously placing the tension sealing ring gasket 72 through a perforation in the shell wall of the test sample 12. Next, the tension clamp-type sealing ring 72 is fitted onto the gas guide tube and clamped onto the tension sealing ring gasket 73. Finally, the first nut 71 is threaded onto the end of the gas guide tube 13. The first nut 71 and the long nut 74 are located on the inner and outer sides of the test sample 12, respectively. By tightening the first nut 71 and the long nut 74, the tension sealing ring gasket 73, the tension clamp sealing ring 72, and the shell wall of the test sample 12 are clamped between the first nut 71 and the long nut 74, which locks and seals the gas guide tube 13 to the shell of the test sample 12, and allows the gas guide tube 13 to send gas into the test sample 12.

[0025] Furthermore, such as Figure 3 As shown, the tension sealing ring gasket 73 includes a cylindrical section and an annular plate disposed at one end of the cylindrical section, the outer diameter of the annular plate being larger than that of the cylindrical section. The cylindrical section passes through the test sample 12, and the annular plate abuts against the outer side of the shell at the perforation of the test sample 12. The cylindrical section of the tension sealing ring gasket 73 has a certain degree of flexibility, allowing it to be clamped to the outside of the air guide tube 13. Under the clamping action of the tension clamp-type sealing ring 72, and under the pressure exerted on the shell wall of the test sample 12 after the first nut 71 and the long nut 74 are tightened, the air guide tube 13 is locked while simultaneously sealing the perforation.

[0026] Furthermore, such as Figure 4 As shown, the tensioning clamp-type sealing ring 72 is an elastic ring with a notch, and the clamp plays an elastic clamping role on the tensioning sealing ring gasket 73.

[0027] Example 5 differs from Example 1 in that, as Figure 1 As shown, the test system for testing the sealing pressure resistance of laser-welded plastics also includes a pneumatic control unit. The pneumatic control unit is connected to a gas booster device, namely a pneumatic booster pump 3, and an on / off control device, a pneumatic control valve 4, and is used to control the start and stop of the pneumatic booster pump 3 and the on / off state of the pneumatic control valve 4.

[0028] Furthermore, the pneumatic control unit includes a pneumatic control source, which comprises an air compressor 11 and a pneumatic dual unit 9 connected in series. The pneumatic dual unit 9 is connected to a valve island 8, which is connected to a pneumatic booster pump 3 and a pneumatic control valve 4, respectively. Both the pneumatic dual unit 9 and the valve island 8 adopt existing structures.

[0029] Furthermore, such as Figure 1 As shown, an air tank 10 is provided between the air compressor 11 and the pneumatic dual unit 9. By providing the air tank 10, the air control unit plays a role in stabilizing pressure, buffering pulses, and storing energy.

[0030] Furthermore, the pneumatic control unit can be connected to an external manual valve, or the valve island 8 itself can be equipped with a manual knob or other functions, thereby realizing manual control of the pneumatic control unit. By coordinating the control of key components in the test air circuit, namely the pneumatic booster pump 3 and the pneumatic control valve 4, the test efficiency is improved and human error is eliminated.

[0031] In another preferred embodiment, the pneumatic control source can also be connected to a host computer or PLC controller to achieve automatic control.

[0032] Example 6: The testing process of this utility model is as follows: 1. Preparations before testing 1.1 Before laser welding, a long nut 74 with a fastening washer and a tension sealing ring 73 are sequentially fitted onto the gas duct, passing through the vent of the test sample 13. Simultaneously, the cylindrical section of the tension sealing ring 73 is also inserted into the vent, with the annular end of the tension sealing ring 73 abutting against the long nut 74. A tension clamp-type sealing ring 72 is then fitted onto the gas duct and clamps the cylindrical end of the tension sealing ring 73. Next, a first nut 71 with a fastening washer is fitted onto the gas duct. After tightening the first nut 71, the long nut 74 is also pulled tight against the test sample 13. After the gas duct is locked onto the test sample 13 by the two nuts, the tension sealing ring 73, and the tension clamp-type sealing ring 72, the bottom of the test sample 13 is welded and sealed. 1.2 Place the test sample 13 into the test container 6, and connect the air delivery tube to the digital pressure gauge through the hole in the test container 6. Close the door of the test container and lock it. 1.3 Configure the digital pressure gauge to retain peak pressure value mode.

[0033] 2. Conduct testing 2.1 Connect the power supply to the booster pump and the pneumatic control unit, and set the input gas switch of the booster pump to the "ventilation" position. Set the control valve through the pneumatic control unit to increase the valve air intake at a rate of 0.01 MPa / s. Observe the value of the digital pressure gauge. Continue to increase the pressure until the welded seal cracks and the value of the digital pressure gauge stops increasing. The test is then complete. 2.2 When testing the weld sealing performance, inject pure water into the test sealing container until the water level submerges the test sample. After turning on the control valve, gradually increase the pressure (until the air pressure reaches the level that would cause the weld sealing plastic part to crack). Observe whether there are continuous bubbles on the surface of the pure water. If no bubbles are generated, it indicates that the weld sealing performance is good. If there are continuous bubbles discharged, it indicates that the weld is completely sealed. 2.3 To better analyze the quality of welding strength, the data monitored by the digital pressure gauge during the pressurization process can be imported. Through the pressure-time relationship graph, three aspects can be analyzed. 1) Normal welding of plastic parts (pressure-time relationship graph) 2) Plastic parts with uneven welding but good sealing performance (pressure-time graph) 3) Plastic parts with incomplete welding and poor sealing (pressure-time graph) 2.4 Record the maximum value of the digital pressure gauge, which is the maximum pressure resistance value of the welded plastic parts for sealing.

[0034] 3. Equipment reset 3.1 After the test, first turn off the power switch of the booster pump, then control the gas output switch of the booster pump to the "off" position; when the pressure gauge of the pneumatic control valve displays "0", reduce the pressure of the pneumatic control valve to the zero position. 3.2 Remove the nuts, tension sealing ring gaskets, and tension clamp-type sealing rings from the tested welded plastic parts for future use; 3.3 Remove the test sample and complete the test report.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some or all of the technical features thereof, within the spirit and principles of the present invention, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A pressure resistance testing system for testing the sealing performance of laser-welded plastics, characterized in that, It includes a sealing test unit, which includes a test gas path. Along the airflow direction, the test gas path is provided with a gas source (1), a gas pressurization device, an on / off control device, and a test sample (12). The end of the test gas path is connected to the test sample (12) through a locking assembly (7).

2. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to claim 1, characterized in that, The end of the test air path is provided with an air guide tube (13) with external threads. The locking assembly (7) includes a long nut (74) threaded on the air guide tube (13), a tension sealing ring gasket (73) sleeved on the air guide tube (13), a tension clamp sealing ring (72) clamped on the tension sealing ring gasket (73), and a first nut (71) threaded on the end of the air guide tube (13). The air guide tube (13) passes through the shell of the test sample (12) so that the first nut (71) and the long nut (74) are located on the inner and outer sides of the test sample (12) respectively, and the tension sealing ring gasket (73), the tension clamp sealing ring (72), and the shell wall of the test sample (12) are clamped between the first nut (71) and the long nut (74).

3. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to claim 2, characterized in that, The tension sealing ring gasket (73) includes a cylindrical section and an annular plate disposed at one end of the cylindrical section. The cylindrical section passes through the test sample (12), and the annular plate abuts against the outer side of the shell of the test sample (12).

4. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to any one of claims 1 to 3, characterized in that, A pressure gauge (5) is also provided on the test air circuit, and the pressure gauge (5) is located between the on / off control device and the test sample (12).

5. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to any one of claims 1 to 3, characterized in that, It also includes a gas control unit, which is connected to the gas booster and the on / off control device, and is used to control the start and stop of the gas booster and the on / off status of the on / off control device.

6. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to claim 5, characterized in that, The gas booster device is a pneumatic booster pump (3); the on / off control device is a pneumatic control valve (4).

7. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to claim 6, characterized in that, The pneumatic control unit includes a pneumatic control source, which is connected to a pneumatic booster pump (3) and a pneumatic control valve (4) via a valve island (8).

8. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to claim 7, characterized in that, The pneumatic control source includes an air compressor (11) and a pneumatic dual unit (9) connected to the air compressor (11).

9. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to claim 8, characterized in that, An air storage tank (10) is provided between the air compressor (11) and the pneumatic dual unit (9).

10. The pressure resistance testing system for testing the sealing performance of laser-welded plastics according to any one of claims 1-3 and 6-9, characterized in that, The sealing test unit also includes a test container (6) for placing the test sample (12), the test container (6) having a placement inlet and a lockable door panel on the placement inlet.

Images