Accelerated aging test device for rubber sealing ring

Abstract

The invention belongs to the technical field of aging life evaluation of rubber sealing elements, and relates to an accelerated aging test device for a rubber sealing ring. Comprising a motor driving and torque detecting system (1), a rotating shaft system (2), a rubber sealing ring testing system (3) and a device mounting bottom plate (4), the rubber sealing ring accelerated aging test device provided by the invention is relatively simple in structural form and convenient to operate, and can be used for carrying out an accelerated aging test of the rubber sealing ring, so that the compression deformation during assembly of the rubber sealing ring can be flexibly controlled; parameters such as medium temperature, pressure, part rotating speed, torque, revolution and the like which are consistent with or higher than those of an actual sealing structure can be controlled in the test process, and the aging and failure processes of the rubber sealing ring during working in a weapon equipment structure can be effectively simulated; and the effect of improving the accuracy of aging resistance evaluation and service life prediction of the rubber sealing ring is achieved.

Description

Technical field:

[0001] The invention belongs to the technical field of aging life evaluation of rubber sealing parts and relates to an accelerated aging test device for rubber sealing rings. Background technology:

[0002] Rubber sealing rings are the most widely used type of sealing parts in weapon equipment bodies and accessories. When they are assembled at the sealing part, they are compressed by the components and produce a certain degree of initial deformation. They can fill the gaps between components and prevent the flow of gas or liquid. With the good elastic properties of rubber materials, the sealing rings and components are in close contact to prevent the leakage of gas or liquid with a certain pressure. However, the long-term use of rubber sealing rings in weapon equipment structures will inevitably be affected by factors such as heat, oxygen, and working media, resulting in aging, which will lead to a decrease in the elastic properties of the rubber material, and the sealing rings and components will no longer be in close contact, which will cause gas or liquid leakage accidents. Therefore, it is necessary to evaluate and study the aging resistance of rubber sealing rings at the beginning of the design of weapons and equipment, and predict their service life in equipment structures.

[0003] At present, the evaluation of the aging resistance of rubber sealing rings is generally carried out through the heat-medium aging test of rubber sealing rings under a persistent compression state. The corresponding persistent compression state simulates the compression deformation of the rubber sealing ring during assembly. The environmental conditions of the heat-medium aging simulate and strengthen the heat, oxygen, working medium and other factors in the working environment, so as to achieve the effect of accelerated aging and failure of the rubber sealing ring. Then, the aging resistance of the rubber sealing ring is reflected by the change rate of evaluation parameters such as compression permanent deformation and compression stress relaxation. For the prediction of the service life of the rubber sealing ring, the Arrhenius, Eyring and other aging dynamic models of evaluation parameters such as compression permanent deformation and compression stress relaxation are established on the basis of the above-mentioned heat-medium accelerated aging test, and the critical values ​​of the corresponding evaluation parameters at failure are combined for analysis and calculation. However, the existing accelerated aging test method only simulates and strengthens the static factors in the working environment, and has not yet considered the comprehensive effect of dynamic factors such as medium pressure and component movement on the aging process of the rubber sealing ring and the failure of the seal during the working process of the rubber sealing ring, which leads to inaccurate aging resistance evaluation and service life prediction. Summary of the invention:

[0004] The technical problem to be solved by the present invention is to provide a rubber sealing ring accelerated aging test device, which comprehensively simulates dynamic and static factors such as compression deformation, working medium, temperature, pressure, and component movement in the actual working environment of the rubber sealing ring, so as to improve the accuracy of the rubber sealing ring aging resistance performance evaluation and service life prediction.

[0005] The technical solution of the present invention is described as follows in conjunction with the accompanying drawings:

[0006] A rubber sealing ring accelerated aging test device, comprising: a motor drive and torque detection system 1, a rotating shaft system 2, a rubber sealing ring test system 3, and a device installation base plate 4; wherein the motor drive and torque detection system 1, the rotating shaft system 2, and the rubber sealing ring test system 3 are sequentially fixed on the device installation base plate 4, and the rubber sealing ring test system 3 is composed of a fixed disc 12, a test medium cavity 13, a temperature sensor 14, a pointer pressure gauge 15, a medium pipeline and a one-way valve 16, a fine-tuning needle valve 17, and a pressure sensor 18; the fixed disc 1 2 forms a clearance fit with the rotatable disc 11 in the rotating shaft system 2, a circular mounting groove 19 for a sealing ring is processed at the center of the fixed disc 12, the test medium chamber 13 adopts a horizontally placed cylindrical structure, one end is open and the other end is closed, the open end is fixedly connected to the fixed disc 12, the closed end is opened and a medium pipeline, a one-way valve 16 and a pressure sensor 18 are welded thereon, a fine-tuning needle valve 17 is arranged on the side of the medium pipeline and the one-way valve 16, a pointer pressure gauge 15 is arranged on the top of the test medium chamber 13, and a temperature sensor 14 is arranged on the side.

[0007] The motor drive and torque detection system 1 is composed of a servo motor 5, a planetary reducer 6, a dynamic torque sensor 7, and a coupling 8. The servo motor 5 is connected to the planetary reducer 6, the dynamic torque sensor 7, and the coupling 8 in sequence, and the coupling 8 is connected to the rotating shaft 9 in the rotating shaft system 2.

[0008] The rotating shaft system 2 consists of a rotating shaft 9, a bearing seat 10, and a rotatable disc 11; the rotating shaft 9 is connected to the bearing seat 10 and the rotatable disc 11 in sequence, the rotating shaft 9 is connected to the coupling 8 in the motor drive and torque detection system 1, and forms a clearance fit with the fixed disc 12 in the rubber sealing ring test system 3.

[0009] The rotatable disc 11 is manufactured according to the material and surface treatment process of the moving parts in the actual sealing structure.

[0010] The fixed disc 12 is manufactured according to the material and surface treatment process of the static parts in the actual sealing structure.

[0011] The width and depth of the circular installation groove 19 are consistent with the groove dimensions of the rubber sealing ring of the actual sealing structure.

[0012] The test medium chamber 13 and the fixed disc 12 are connected by flange sealing or welding.

[0013] The steps of performing an aging test using the rubber sealing ring accelerated aging test device are as follows:

[0014] Step 1: Install the rubber seal ring to be tested on the seal ring circular installation groove 19 at the center of the fixed disc 12, fix the rubber seal ring test system 3 on the device installation base plate 4, and press the rotatable disc 11 of the rotating shaft system 2 against the rubber seal ring installed on the fixed disc 12, control the gap between the rotatable disc 11 and the fixed disc 12 to make it the same as the sealing gap of the actual sealing structure, and under this condition, fix the rotating shaft system 2 and the motor drive and torque detection system 1 on the device installation base plate;

[0015] Step 2: Inject the medium required for sealing the actual sealing structure into the test medium cavity 13 through the medium pipeline and the one-way valve 16, and use the pointer pressure gauge 15 and the fine-tuning needle valve 17 to control the pressure of the injected medium to reach 5% to 20% of the working pressure required for the aging test; use a temperature-controlled heating table or a heating belt to heat and control the temperature of the test medium cavity 13, so that the medium temperature monitored by the temperature sensor 14 reaches the temperature required for the aging test; further inject the medium required for sealing the actual sealing structure into the test medium cavity 13 through the medium pipeline and the one-way valve 16, and use the pointer pressure gauge 15 and the fine-tuning needle valve 17 to control the pressure of the injected medium to reach the medium working pressure required for the aging test;

[0016] Step 3: When the medium temperature and pressure reach the set value, keep the controlled temperature unchanged, start the aging test timing, and continuously record the medium temperature and pressure data during the test;

[0017] Step 4: When the components of the actual sealing structure are rotating at a low speed, the servo motor 5 is started to rotate the rotatable disc 11 according to the speed, torque and frequency of the actual working condition, and the speed, torque and cumulative number of revolutions of the rotatable disc 11 are continuously recorded during the test;

[0018] Step 5: When the test time reaches the preset test time of the accelerated aging test, the test ends; or when the medium pressure in the test medium chamber 13 drops below the set minimum working pressure, the rubber sealing ring is determined to have failed sealing and the test ends.

[0019] Technical effect of the invention: The accelerated aging test device for rubber sealing rings provided by the invention has a relatively simple structure and is easy to operate. By using the accelerated aging test device for rubber sealing rings, the compression deformation of the rubber sealing rings during assembly can be flexibly controlled, and the medium temperature, pressure and component rotation speed, torque, number of revolutions and other parameters that are consistent with or higher than the actual sealing structure can be controlled during the test process. The aging and failure process of the rubber sealing rings when working in the weapon equipment structure can be effectively simulated, thereby achieving the effect of improving the evaluation of the aging resistance of the rubber sealing rings and the accuracy of service life prediction. Description of the drawings:

[0020] Attached Figure 1 It is a structural schematic diagram of the accelerated aging test device for rubber sealing rings of the present invention;

[0021] In the figure, 1 is the motor drive and torque detection system, 2 is the rotating shaft system, 3 is the rubber sealing ring test system, and 4 is the device installation base plate.

[0022] Attached Figure 2 It is a structural schematic diagram of the motor drive and torque detection system in the device;

[0023] In the figure, 5 is a servo motor, 6 is a planetary reducer, 7 is a dynamic torque sensor, and 8 is a coupling.

[0024] Attached Figure 3 It is a structural schematic diagram of the rotating shaft system in the device;

[0025] In the figure, 9 is a rotating shaft, 10 is a bearing seat, and 11 is a rotatable disc.

[0026] Attached Figure 4 It is a structural schematic diagram of the rubber sealing ring test system in the device;

[0027] In the figure, 12 is a fixed disc, 13 is a test medium chamber, 14 is a temperature sensor, 15 is a pointer pressure gauge, 16 is a medium pipeline and a one-way valve, 17 is a fine-tuning needle valve, and 18 is a pressure sensor.

[0028] Attached Figure 5 This is a schematic diagram of the installation location of the rubber sealing ring;

[0029] 19 is a circular mounting groove for the rubber sealing ring. Specific implementation method:

[0030] The specific implementation of the accelerated aging test device for rubber sealing rings is further described below in conjunction with the accompanying drawings.

[0031] As attached Figure 1 As shown, the rubber seal ring accelerated aging test device of the present invention comprises four parts: a motor drive and torque detection system 1, a rotating shaft system 2, a rubber seal ring test system 3, and a device installation base plate 4. A plurality of positioning holes are punched on the device installation base plate 4, which are used to fix the three systems, namely, the motor drive and torque detection system 1, the rotating shaft system 2, and the rubber seal ring test system 3, through positioning bolts or positioning pins.

[0032] As attached Figure 2 As shown, the motor drive and torque detection system 1 is composed of four components, namely, a servo motor 5, a planetary reducer 6, a dynamic torque sensor 7, and a coupling 8.

[0033] The servo motor 5 is connected to the rotating shaft 9 in the rotating shaft system 2 through the planetary reducer 6, the dynamic torque sensor 7, and the coupling 8 in sequence, and can provide power to drive the rotating parts in the test device to rotate at a low speed, while controlling the speed and torque of the corresponding parts.

[0034] The planetary reducer 6 is used to reduce the rotation speed of the servo motor 5 and increase its output torque.

[0035] The dynamic torque sensor 7 is used to detect the torque value during the rotation of the component.

[0036] The coupling 8 can slide forward and backward to achieve the connection between the power shaft of the motor drive and torque detection system 1 and the rotating shaft system 2. The coupling 8 is equipped with a spring pin to achieve the locking and disconnection of the corresponding connection.

[0037] As attached Figure 3 As shown, the rotating shaft system is composed of a rotating shaft 9, a bearing seat 10, a rotatable disc 11 and other components.

[0038] The rotating shaft 9 is connected to the coupling 8 in the motor drive and torque detection system 1 to transmit the rotation speed and torque of the servo motor 5 .

[0039] The bearing seat 10 is equipped with a double bearing bracket and bearings, which can provide support for the rotating shaft 9 and reduce the vibration of the rotating shaft 9.

[0040] The rotatable disc 11 is a component in contact with the rubber seal ring, and is used to realize the end face sealing of the rubber seal ring test system 3. It is manufactured according to the material and surface treatment process of the dynamic component in the actual sealing structure, and forms a clearance fit with the fixed disc 12 in the rubber seal ring test system 3. The servo motor 5 is started as needed to realize the low-speed rotation of the disc, thereby realizing the simulation of the dynamic sealing working condition.

[0041] As attached Figure 4 As shown, the rubber sealing ring test system is composed of seven components, namely, a fixed disc 12, a test medium chamber 13, a temperature sensor 14, a pointer pressure gauge 15, a medium pipeline and a one-way valve 16, a fine-tuning needle valve 17, and a pressure sensor 18.

[0042] The fixed disc 12 is used as a mounting component for the rubber seal ring. It is made according to the material and surface treatment process of the static component in the actual sealing structure. A circular mounting groove 19 for the rubber seal ring is processed in the center. The width and depth of the groove are consistent with the groove dimensions of the rubber seal ring in the actual sealing structure. The gap between the fixed disc 12 and the rotatable disc 11 in the rotating shaft system 2 is controlled to simulate the sealing gap of the actual sealing structure.

[0043] The test medium chamber 13 is used to contain the test medium such as gas or liquid in the test system. It adopts a horizontally placed cylindrical structure, with a pointer pressure gauge 15 on the top, which can be used to visually check the pressure of the test medium in the test system, and a temperature sensor 14 on the side, which can be used to monitor the temperature data of the medium in the test medium chamber. One end of the cylindrical structure is open and the other end is closed. The open end is connected to the fixed disc 12 by flange sealing or welding, and the closed end is opened on it and welded with a medium pipeline, a one-way valve 16 and a pressure sensor 18. The medium pipeline and the one-way valve are used to inject the test medium into the test medium chamber 13 and pressurize it to prevent the reverse flow of the test medium and improve the sealing of the test medium chamber; a fine-tuning needle valve 17 is set on the side of the medium pipeline, which can be used to accurately control the pressure of the test medium; the pressure sensor 18 is used to monitor the pressure data of the test medium chamber.

[0044] The specific steps of conducting the test using the rubber sealing ring accelerated aging test device are further described below in conjunction with the embodiments.

[0045] The accelerated aging test was conducted on the FX-17 fluororubber O-ring used in aviation equipment to simulate the actual sealing structure assembly parameters and working environment. The test was preset to be 500 hours under the typical extreme temperature and typical medium pressure during operation. The typical size of the FX-17 fluororubber seal ring is Φ38.7mm×Φ1.8mm, the sealing method is end face sealing, the diameter of the installation groove is Φ40mm, the width is 2mm, the depth is 1.2mm, the sealing gap is 0.24mm, the sealing medium is Pegasus II lubricating oil, the typical extreme temperature during operation is 150℃, the typical medium working pressure is 0.5MPa, the minimum working pressure is 0.3MPa, the material of the sealing part is ZL114A aluminum alloy, and the surface is treated with sulfuric acid anodizing process.

[0046] Step 1: The rotatable disc 11 and the fixed disc 12 of ZL114A aluminum alloy material are manufactured by mechanical processing, a circular mounting groove 19 with a diameter of Φ40 mm is processed in the center of the fixed disc 12, and the surfaces of the rotatable disc 11 and the fixed disc 12 are all subjected to sulfuric acid anodizing process, so that the final width of the circular mounting groove 19 is 2 mm and the final depth is 1.2 mm.

[0047] Step 2: Install the FX-17 fluororubber sealing ring to be tested on the circular sealing ring mounting groove 19 at the center of the fixed disk 12, fix the rubber sealing ring test system 3 on the device mounting base 4, and press the rotatable disk 11 of the rotating shaft system 2 against the FX-17 fluororubber sealing ring installed on the fixed disk 12, and use a feeler gauge to control the gap between the rotatable disk 11 and the fixed disk 12 to reach 0.24mm, and under this condition, fix the rotating shaft system 2 and the motor drive and torque detection system 1 on the device mounting base.

[0048] Step 3: Inject Pegasus II lubricating oil into the test medium cavity 13 through the medium pipeline and the one-way valve 16, and control the pressure of the Pegasus II lubricating oil through the pointer pressure gauge 15 and the fine-tuning needle valve 17 to reach 10% of the typical medium pressure of 0.5 MPa during operation at 0.05 MPa; use a temperature-controlled heating table or a heating belt to heat and control the temperature of the test medium cavity 13 so that the temperature of the Pegasus II lubricating oil monitored by the temperature sensor 14 reaches 150°C; at high temperature, further inject Pegasus II lubricating oil into the test medium cavity 13 through the medium pipeline and the one-way valve 16, and use the pointer pressure gauge 15 and the fine-tuning needle valve 17 to control the pressure of the Pegasus II lubricating oil to reach 0.5 MPa.

[0049] Step 4: When the temperature of Pegasus II lubricating oil reaches 150°C and the pressure reaches 0.5MPa, the controlled temperature is kept constant at 150°C, the aging test timing is started, and the temperature and pressure data of Pegasus II lubricating oil are continuously recorded during the test.

[0050] Step 5: Since there is no low-speed rotation condition of the component at the sealing part where the FX-17 fluororubber sealing ring is located, the servo motor 5 is not started, and there is no need to continuously record the speed, torque and cumulative number of revolutions of the rotatable disk 11 during the test.

[0051] Step 6: When the test time reaches the preset 500h of the accelerated aging test, the test ends; or when the Pegasus II lubricating oil pressure in the test medium chamber 13 drops below 0.3MPa, the FX-17 fluororubber sealing ring is determined to have failed, the corresponding failure time is recorded, and the test ends.

Claims

1. A rubber sealing ring accelerated aging test device, characterized in that: include: A motor drive and torque detection system (1), a rotating shaft system (2), a rubber sealing ring test system (3), and a device installation base plate (4); the motor drive and torque detection system (1), the rotating shaft system (2), and the rubber sealing ring test system (3) are fixed on the device installation base plate (4) in sequence, and the rubber sealing ring test system (3) is composed of a fixed disc (12), a test medium chamber (13), a temperature sensor (14), a pointer pressure gauge (15), a medium pipeline and a one-way valve (16), a fine-tuning needle valve (17), and a pressure sensor (18); the fixed disc (12) and the rotating shaft system The rotatable disc (11) in (2) forms a clearance fit, and a circular mounting groove (19) for a sealing ring is processed at the center of the fixed disc (12). The test medium chamber (13) adopts a horizontally placed cylindrical structure, one end is open and the other end is closed. The open end is fixedly connected to the fixed disc (12), and the closed end is opened and a medium pipeline, a one-way valve (16) and a pressure sensor (18) are welded thereon. A fine-tuning needle valve (17) is arranged on the side of the medium pipeline and the one-way valve (16). A pointer pressure gauge (15) is arranged on the top of the test medium chamber (13), and a temperature sensor (14) is arranged on the side.

2. The accelerated aging test device for rubber sealing ring according to claim 1, characterized in that: The motor drive and torque detection system (1) is composed of a servo motor (5), a planetary reducer (6), a dynamic torque sensor (7), and a coupling (8); the servo motor (5) is connected to the planetary reducer (6), the dynamic torque sensor (7), and the coupling (8) in sequence; and the coupling (8) is connected to a rotating shaft (9) in the rotating shaft system (2).

3. The accelerated aging test device for rubber sealing ring according to claim 1, characterized in that: The rotating shaft system (2) is composed of a rotating shaft (9), a bearing seat (10), and a rotatable disc (11); the rotating shaft (9) is connected to the bearing seat (10) and the rotatable disc (11) in sequence, and the rotating shaft (9) is connected to a coupling (8) in a motor drive and torque detection system (1), and forms a clearance fit with a fixed disc (12) in a rubber sealing ring test system (3).

4. The accelerated aging test device for rubber sealing ring according to claim 1, characterized in that: The rotatable disc (11) is manufactured according to the material and surface treatment process of the moving parts in the actual sealing structure.

5. The accelerated aging test device for rubber sealing ring according to claim 1, characterized in that: The fixed disc (12) is manufactured according to the material and surface treatment process of the static component in the actual sealing structure.

6. The accelerated aging test device for rubber sealing ring according to claim 1, characterized in that: The width and depth dimensions of the circular installation groove (19) are consistent with the groove dimensions of the rubber sealing ring of the actual sealing structure.

7. The accelerated aging test device for rubber sealing ring according to claim 1, characterized in that: The test medium chamber (13) and the fixed disc (12) are connected by flange sealing or welding.

8. A method for performing an aging test on a rubber sealing ring accelerated aging test device according to any one of claims 1 to 7, comprising the following steps: Step 1: Install the rubber sealing ring to be tested on the sealing ring circular installation groove (19) at the center of the fixed disc (12), fix the rubber sealing ring test system (3) on the device installation base plate (4), and press the rotatable disc (11) of the rotating shaft system (2) against the rubber sealing ring installed on the fixed disc (12), control the gap between the rotatable disc (11) and the fixed disc (12) to make it the same as the sealing gap of the actual sealing structure, and under this condition, fix the rotating shaft system (2) and the motor drive and torque detection system (1) on the device installation base plate; Step 2: inject the sealing medium required for the actual sealing structure into the test medium cavity (13) through the medium pipeline and the one-way valve (16), and use the pointer pressure gauge (15) and the fine-tuning needle valve (17) to control the pressure of the injected medium so that it reaches 5% to 20% of the working pressure required for the aging test; use a temperature-controlled heating table or a heating belt to heat and control the temperature of the test medium cavity (13) so that the medium temperature monitored by the temperature sensor (14) reaches the temperature required for the aging test; further inject the sealing medium required for the actual sealing structure into the test medium cavity (13) through the medium pipeline and the one-way valve (16), and use the pointer pressure gauge (15) and the fine-tuning needle valve (17) to control the pressure of the injected medium so that it reaches the working pressure of the medium required for the aging test; Step 3: When the medium temperature and pressure reach the set value, keep the controlled temperature unchanged, start the aging test timing, and continuously record the medium temperature and pressure data during the test; Step 4: When the components of the actual sealing structure are rotating at a low speed, the servo motor (5) is started to rotate the rotatable disc (11) according to the speed, torque and frequency of the actual working condition, and the speed, torque and cumulative number of revolutions of the rotatable disc (11) are continuously recorded during the test; Step 5: When the test time reaches the preset test time of the accelerated aging test, the test ends; or when the medium pressure in the test medium chamber (13) drops below the set minimum working pressure, it is determined that the rubber sealing ring has failed to seal and the test ends.

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