Automobile polymer rubber part testing tool

Abstract

The present application relates to the field of rubber material testing, especially to a kind of automobile polymer rubber part test tool.The present application relates to a kind of automobile polymer rubber part test tool, by inverting installation of two air shock air bags, and using hydraulic telescopic rod to drive double swing arm, reciprocating compression and stretching test are carried out to the polymer rubber parts used for left and right two air shock air bags, and air flow containing sand is sprayed to the outer surface of air shock air bag by the spray head of annular pipeline, in the process of inverting compression of air shock air bag, fine sand will enter the contraction area of air shock air bag, so that fine sand simultaneously rubs the outer surface on the both sides of contraction area of air shock air bag.The technical problem that the existing test equipment can only implement single form of reciprocating compression and stretching test to air shock air bag, cannot combine environmental influence factors existing in actual use, so that there lacks reliable mapping relationship between laboratory test result and real vehicle service life is overcome.

Description

Technical Field

[0001] This invention relates to the field of rubber material testing, and more particularly to a testing fixture for automotive polymer rubber parts. Background Technology

[0002] As the core actuator of the automotive air suspension system, the airbag is mainly composed of fiber-reinforced polymer rubber composite material. During actual service, it continuously bears the periodic alternating loads caused by road surface unevenness and changes in vehicle body posture. Therefore, the reciprocating compression and stretching test of the polymer rubber material used in the airbag is a key means to evaluate its dynamic fatigue durability, viscoelastic hysteresis heat generation characteristics, and stiffness decay law under long-term use conditions. It is also a verification step that must be completed in the product development stage. However, existing testing equipment can generally only perform a single form of reciprocating compression and extension test on air suspension airbags, that is, it can only provide a fixed loading path with constant amplitude and frequency. It cannot simultaneously apply the coupled effects of multiple factors such as temperature field changes, abrasive erosion, and humidity intrusion. This results in a serious disconnect between the test conditions and real harsh road conditions such as high temperature, high humidity, and mud. It cannot effectively reproduce the failure mechanisms of rubber materials in actual use, such as stress concentration, accelerated wear, and coupled damage caused by surface contamination and abrasive particles. As a result, there is no reliable mapping relationship between laboratory test results and the service life of actual vehicles, making it difficult to accurately guide material formulation optimization and structural fatigue resistance design. Summary of the Invention

[0003] To overcome the shortcomings of existing testing equipment, which can only perform a single form of reciprocating compression and expansion test on air suspension airbags and cannot take into account the environmental factors that exist in actual use, resulting in a lack of reliable mapping relationship between laboratory test results and actual vehicle service life, this invention provides a testing fixture for automotive polymer rubber parts.

[0004] Technical Solution: A testing fixture for automotive polymer rubber parts includes a working frame, a bottom mounting frame, double swing arms, a hydraulic telescopic rod, a top mounting frame, an annular pipe, nozzles, a three-way valve, a sand delivery branch pipe, a sand shield, a recovery tray, and an output valve. A bottom mounting frame is fixedly connected to the left and right sides of the working frame. The double swing arms are rotatably connected to the working frame. A hydraulic telescopic rod is mounted on the working frame to drive the double swing arms to reciprocate up and down. A top mounting frame is fixedly connected to the left and right sides of the double swing arms, located directly above the bottom mounting frames on the same side. An annular pipe is fixedly connected to the top mounting frame. Several nozzles are connected to the annular pipe. A three-way valve is connected to the annular pipe. The three-way valve is connected to the sand delivery branch pipe. A sand shield covering the outside of the annular pipe is fixedly connected to the top mounting frame. A recovery tray is fixedly connected to the bottom mounting frame. Each recovery tray is connected to an output valve.

[0005] As a further preferred option, a cushioning pad is fixed between the bottom of the bottom mounting bracket and the work frame.

[0006] Based on the above scheme, as a further preferred option, the sand shield is slidably connected to a sliding cover.

[0007] As a further preferred option, each sliding cover is fixed with explosion-proof glass for observing the internal test status.

[0008] Based on the above scheme, as a further preferred option, an electric heater is installed on the three-way valve.

[0009] As a further preferred option, the inner surfaces of the sand shield, sliding shield, and recovery tray are all provided with an insulating lining structure.

[0010] As a further preferred option, a temperature sensor is installed on the bottom mounting bracket.

[0011] Based on the above scheme, as a further preferred scheme, a spray pipe is fixed to the left and right sides of the double swing arm to spray water mist into the sand shield; the spray pipe is connected to a mist inlet valve.

[0012] As a further preferred option, the inner surface of the explosion-proof glass is coated with a transparent hydrophobic coating.

[0013] As a further preferred option, the bottom of the sand shield is fixed with an annular scraper that is in close contact with the inner surface of the explosion-proof glass; an electric telescopic rod is installed on the left and right sides of the double swing arm to drive the sliding cover on the same side to move up and down.

[0014] Beneficial Effects: This invention provides a testing fixture for automotive polymer rubber components. By inverting two airbags and using a hydraulic telescopic rod to drive a double swing arm, it simultaneously performs reciprocating compression and tensile tests on the polymer rubber components used in the left and right airbags. Simultaneously, a sand-containing airflow is sprayed onto the outer surface of the airbags through a nozzle in a ring-shaped pipe. During the inverted compression process, fine sand enters the airbag's contraction area, causing the sand to simultaneously rub against the outer surfaces on both sides of the contraction area. At the same time, the sand-containing airflow can be heated to simulate the operation of the polymer rubber components used in the airbags under high-temperature road conditions. The harsh environment testing can also be conducted by spraying water mist into the sand-laden airflow to simulate the harsh environment testing of the polymer rubber components used in air suspension under muddy road conditions. This overcomes the technical problem that existing testing equipment can only perform a single form of reciprocating compression and expansion test on air suspension, and cannot combine the environmental influence factors existing in actual use, resulting in a lack of reliable mapping relationship between laboratory test results and actual vehicle service life. This provides a more accurate and accelerated verification method for material selection, structural optimization and durability life prediction of polymer rubber components used in air suspension under various harsh road conditions. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the double swing arm of the present invention; Figure 3 This is a perspective view of the bottom mounting bracket of the present invention; Figure 4 This is a perspective view of the top mounting bracket of the present invention; Figure 5 This is a three-dimensional structural diagram of the sand shield of the present invention.

[0016] Reference numerals: 1-Working frame, 2-Bottom mounting bracket, 21-Buffer pad, 22-Temperature sensor, 3-Double swing arm, 31-Hydraulic telescopic rod, 32-Top mounting bracket, 4-Annular pipe, 41-Nozzle, 42-Three-way valve, 43-Sand conveying branch pipe, 44-Electric heater, 5-Sand baffle, 51-Sliding cover, 52-Explosion-proof glass, 53-Electric telescopic rod, 54-Annular scraper, 6-Recovery disc, 61-Output valve, 7-Spray pipe, 71-Mist inlet valve. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] Example 1: A testing fixture for automotive polymer rubber parts, as described in this example. Figures 1-5As shown, it includes a working frame 1, a bottom mounting frame 2, a double swing arm 3, a hydraulic telescopic rod 31, a top mounting frame 32, an annular pipe 4, a nozzle 41, a three-way valve 42, a sand conveying branch pipe 43, a sand baffle 5, a recovery disc 6, and an output valve 61; a bottom mounting frame 2 is fixedly connected to the left and right sides of the working frame 1; a double swing arm 3 is rotatably connected to the working frame 1; a hydraulic telescopic rod 31 is rotatably connected to the working frame 1 via a rotating shaft; the telescopic end of the hydraulic telescopic rod 31 is rotatably connected to the double swing arm 3 via a rotating shaft; a top mounting frame 32 is fixedly connected to the left and right sides of the double swing arm 3, and the top mounting frame 32 is located above the bottom mounting frame 2 on the same side; two Each of the two top mounting brackets 32 has a ring pipe 4 fixedly connected to it; the bottom of each of the two ring pipes 4 is connected to several nozzles 41; each of the two ring pipes 4 is connected to a three-way valve 42, and the three-way valve 42 is connected to an airflow conveying device; the third port of each of the two three-way valves 42 is connected to a sand conveying branch pipe 43, and the sand conveying branch pipe 43 is connected to a fine sand conveying device; each of the two top mounting brackets 32 has a sand baffle 5 fixedly connected to it, and the sand baffle 5 is located outside the ring pipe 4; each of the two bottom mounting brackets 2 has a recovery disc 6 fixedly connected to it; each of the two recovery discs 6 is connected to an output valve 61, and the output valve 61 is connected to the fine sand recovery channel of the fine sand conveying device.

[0019] like Figure 3 and Figure 5 As shown, a buffer pad 21 is fixed between the bottom of each of the two bottom mounting brackets 2 and the working frame 1. The buffer pad 21 reduces the vibration transmitted from the bottom mounting bracket 2 to the working frame 1 during the test. A sliding cover 51 is slidably connected to the lower side of each of the two sand shields 5. Several explosion-proof glass 52 are fixed to each of the two sliding covers 51. The staff can clearly observe the test status inside the sliding cover 51 through the explosion-proof glass 52.

[0020] This embodiment can simulate the harsh environmental test of the polymer rubber components used in air suspension airbags under gravel road conditions. First, the operator raises the two sliding covers 51 along the sand shield 5 to facilitate the placement of the air suspension airbag between the bottom mounting brackets 2 and the corresponding top mounting brackets 32 on both sides, so that both ends of the air suspension airbag are installed between the corresponding bottom mounting brackets 2 and top mounting brackets 32. At this time, the telescopic end of the air suspension airbag faces upward. Then, the operator lowers the sliding covers 51 from the sand shield 5, with the lower end of the sliding covers 51 located at the return position. Inside the recovery tray 6, but the sliding cover 51 does not contact the recovery tray 6. Then, the hydraulic telescopic rod 31 drives the double swing arm 3 to swing back and forth. When the double swing arm 3 drives the top mounting bracket 32 ​​on one side to move downward, the top mounting bracket 32 ​​drives the telescopic end of the corresponding air shock absorber to compress downward. The telescopic end of the air shock absorber contracts downward and is in a concave state. When the double swing arm 3 drives the top mounting bracket 32 ​​to move upward, the top mounting bracket 32 ​​drives the telescopic end of the corresponding air shock absorber to unfold upward and stretch, thereby realizing the reciprocating compression and stretching test of the air shock absorber.

[0021] During the reciprocating compression and expansion test of the air damping airbags on both sides driven by the double swing arm 3, the three-way valve 42 first switches to a state that only connects to the external airflow conveying equipment. The external airflow conveying equipment continuously delivers airflow into the annular pipe 4 through the three-way valve 42. The airflow is continuously blown from the nozzle 41 to the outer surface of the air damping airbag. When the double swing arm 3 drives the top mounting bracket 32 ​​to compress the air damping airbag, the air damping airbag contracts downward and forms a concave state. At the same time, the three-way valve 42 briefly switches to a state that simultaneously connects to the sand conveying branch pipe 43. The external fine sand conveying equipment delivers fine sand into the airflow in the three-way valve 42 through the sand conveying branch pipe 43. The fine sand is sprayed onto the extension end of the air damping airbag with the airflow, allowing the fine sand to follow the airflow. When the telescopic end of the air damping airbag enters the area where the air damping airbag is in a concave state, the fine sand will simultaneously rub against the outer surfaces on both sides of the concave area of ​​the air damping airbag. When the double swing arm 3 drives the top mounting bracket 32 ​​to move upward and expand the air damping airbag, the concave area of ​​the air damping airbag is stretched upward. At the same time, the fine sand in the concave area of ​​the air damping airbag is ejected outward. The explosion-proof glass 52 on the sand baffle 5 and the sliding cover 51 intercepts the ejected fine sand, allowing the fine sand to fall downward into the recovery tray 6. At this time, the three-way valve 42 switches back to the state of only connecting to the external airflow conveying equipment, allowing the airflow to be continuously blown from the nozzle 41 to the outer surface of the air damping airbag to blow away the fine sand remaining on the outer surface of the air damping airbag.

[0022] This embodiment's timing control strategy of sandblasting during airbag compression and sand blowing during airbag extension not only highly replicates the real physical process of repeated intrusion and expulsion of sand and gravel during the dynamic deformation of the airbag, but also removes residual fine sand from the outer surface through continuous pure airflow purging. This effectively avoids the interference of excessive sand accumulation on subsequent test cycles, ensuring the uniformity and repeatability of sand and gravel friction in each compression and extension cycle. Ultimately, it provides a more realistic accelerated simulation test method for evaluating the wear resistance of polymer rubber components used in airbags under harsh road conditions with multiple sand and gravel, optimizing the design of wrinkled area structures, and studying the failure mechanism induced by sand and gravel intrusion.

[0023] With the output valve 61 in the open state, after the fine sand is collected into the collection disc 6, the double swing arm 3 will cause the bottom mounting bracket 2 and the collection disc 6 to vibrate continuously during the reciprocating compression and expansion test of the air damping airbag. At the same time, the fine sand collected in the collection disc 6 will vibrate, allowing the fine sand in the collection disc 6 to be smoothly discharged downward along the output valve 61 under the action of vibration and flow back to the external fine sand conveying equipment, so that the fine sand can circulate and participate in the spraying work.

[0024] Example 2: A testing fixture for automotive polymer rubber parts, as described in this example. Figures 1-5 As shown, based on Example 1, each of the two three-way valves 42 is equipped with an electric heater 44; the inner surfaces of the two sand shields 5, the two sliding shields 51 and the two recovery trays 6 are all provided with a heat-insulating lining structure; and each of the two bottom mounting brackets 2 is equipped with a temperature sensor 22.

[0025] This embodiment simulates the harsh environmental testing of the polymer rubber components used in air suspension airbags under high-temperature road conditions. After installing two air suspension airbags between the left and right bottom mounting brackets 2 and their corresponding top mounting brackets 32, based on the steps of Embodiment 1, the hydraulic telescopic rod 31 drives the double swing arms 3 to reciprocate, causing the two air suspension airbags to undergo reciprocating compression and expansion tests. Simultaneously, the output valve 61 is closed, and the external airflow delivery device continuously delivers airflow to the annular pipe 4 through the three-way valve 42. The external fine sand delivery device intermittently delivers airflow to the annular pipe 4 through the sand delivery branch pipe 43. Fine sand is transported through the airflow in the three-way valve 42, and the nozzle 41 of the annular pipe 4 intermittently sprays fine sand into the air damping airbag. At the same time, the electric heater 44 heats the airflow transported in the three-way valve 42 into a high-temperature airflow. After the high-temperature airflow is sprayed into the cavity formed by the sand baffle 5, the sliding cover 51 and the recovery disc 6, its internal temperature gradually increases. Meanwhile, the temperature sensor 22 continuously monitors whether the internal temperature of the sand baffle 5 reaches the set high temperature state, so that the air damping airbag is subjected to reciprocating compression and expansion tests in a high-temperature environment, which truly reproduces the thermal decay effect of high temperature environment on the superelasticity and viscoelasticity of polymer rubber parts.

[0026] During the testing process, the high-temperature airflow transfers heat to the fine sand particles, causing the sand particles to heat up simultaneously. As the fine sand heats up, it continuously rubs against the outer surface of the airbag undergoing reciprocating compression and stretching tests, creating a superposition of high-temperature particle erosion and dynamic mechanical load. This not only accelerates the assessment of the wear resistance and tear resistance of polymer rubber components under hot conditions, but also effectively exposes the stress concentration and early crack initiation problems induced by sand particle embedding or scratching in the wrinkled areas of polymer rubber components under high-temperature softening conditions. The synergistic and continuous effect of the thermal environment and abrasive impact ultimately provides a more accurate and accelerated verification method for the material selection, structural optimization, and durability life prediction of polymer rubber components used in airbags under high-temperature and harsh road conditions, closely resembling the conditions of actual vehicle service.

[0027] Example 3: A testing fixture for automotive polymer rubber parts, as described in this example. Figures 1-5 As shown, based on Embodiment 1, a spray pipe 7 is fixedly connected to the left and right sides of the double swing arm 3, and the spray pipe 7 penetrates downward through the sand shield 5; each of the two spray pipes 7 is connected to a mist inlet valve 71, and the mist inlet valve 71 is connected to a water mist conveying device; each explosion-proof glass 52 is coated with a layer of transparent hydrophobic coating to reduce the adhesion of water mist on the inner surface of the explosion-proof glass 52; each of the two sand shields 5 is fixedly connected to the bottom of an annular scraper 54, and the annular scraper 54 is in close contact with the inner surface of the corresponding explosion-proof glass 52; an electric telescopic rod 53 is installed on the left and right sides of the double swing arm 3; the telescopic ends of the two electric telescopic rods 53 are respectively fixedly connected to the sliding cover 51 on the same side.

[0028] This embodiment simulates the harsh environmental testing of the polymer rubber components used in air suspension airbags under muddy road conditions. After installing two air suspension airbags between the left and right bottom mounting brackets 2 and their corresponding top mounting brackets 32, based on the steps of Embodiment 1, the hydraulic telescopic rod 31 drives the double swing arm 3 to swing back and forth, causing the two air suspension airbags to compress and expand repeatedly. Fine sand is intermittently sprayed into the air suspension airbags through the nozzle 41 of the annular pipe 4. Simultaneously, the output valve 61 is closed, and the mist inlet valve 71 is switched to the open state. An external water mist delivery device continuously supplies water mist into the spray pipe 7 through the mist inlet valve 71, and the water mist in the spray pipe 7 is continuously sprayed. The sand is sprayed between the sand shield 5, the sliding shield 51, and the recovery disc 6. When fine sand is sprayed onto the outer surface of the air damper, the water mist acts as a wetting medium and adheres to the surface of the polymer rubber component, increasing the adhesion to the fine sand particles. This causes the fine sand to clump together and adhere to the outer surface of the air damper. Simulating a car driving on a muddy road, the outer surface of the air damper is covered with a large amount of high-humidity mud. The air damper is subjected to continuous compression and expansion tests with a large amount of clumps of fine sand adhering to its outer surface. This allows the air damper to continuously withstand alternating loads under the condition of surface mud load, thereby effectively assessing the dynamic fatigue durability and sealing performance degradation law of the polymer rubber component under dirty conditions.

[0029] This test method accelerates the simulation of the coupled effects of mud on airbag surface wear, stress concentration in wrinkled areas, and material aging. It takes into account the controllability, repeatability, and economy of the test environment. Ultimately, it provides an accelerated testing method that is closer to the actual vehicle service conditions for the design verification of the adaptability of polymer rubber parts used in air suspension airbags under muddy road conditions. During the test, if the observation effect is affected by a large amount of mud adhering to the inner surface of the explosion-proof glass 52, the staff can temporarily shut down the hydraulic telescopic rod 31, the three-way valve 42, and the fog valve 71 to pause the test. Then, the electric telescopic rod 53 is controlled to pull the sliding cover 51 to move the explosion-proof glass 52 upward through the annular scraper 54, so that most of the mud adhering to the inner surface of the explosion-proof glass 52 can be scraped off by the annular scraper 54.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing fixture for automotive polymer rubber parts, comprising a work frame (1); a bottom mounting bracket (2) is fixedly connected to the left and right sides of the work frame (1); characterized in that: It also includes a double swing arm (3); the double swing arm (3) is rotatably connected to the work frame (1); the work frame (1) is equipped with a hydraulic telescopic rod (31) that drives the double swing arm (3) to swing up and down; a top mounting bracket (32) is fixed to each of the left and right sides of the double swing arm (3), and the top mounting bracket (32) is located directly above the bottom mounting bracket (2) on the same side; an annular pipe (4) is fixed to the top mounting bracket (32); the annular pipe (4) is connected to several nozzles (41); a three-way valve (42) is connected to the annular pipe (4); the three-way valve (42) is connected to a sand conveying branch pipe (43); a sand baffle (5) is fixed to the top mounting bracket (32) and covers the outside of the annular pipe (4); a recovery plate (6) is fixed to the bottom mounting bracket (2); and an output valve (61) is connected to each recovery plate (6).

2. The testing fixture for automotive polymer rubber parts according to claim 1, characterized in that: The bottom mounting bracket (2) has a buffer pad (21) fixed between its bottom and the work frame (1).

3. The testing fixture for automotive polymer rubber parts according to claim 1, characterized in that: The sand shield (5) is slidably connected to a sliding cover (51).

4. The testing fixture for automotive polymer rubber parts according to claim 3, characterized in that: Each sliding cover (51) is fixed with explosion-proof glass (52) for observing the internal test status.

5. A testing fixture for automotive polymer rubber parts according to claim 4, characterized in that: An electric heater (44) is installed on the three-way valve (42).

6. A testing fixture for automotive polymer rubber parts according to claim 5, characterized in that: The inner surfaces of the sand shield (5), sliding shield (51) and recovery tray (6) are all provided with a heat-insulating lining structure.

7. A testing fixture for automotive polymer rubber parts according to claim 5, characterized in that: A temperature sensor (22) is mounted on the bottom mounting bracket (2).

8. A testing fixture for automotive polymer rubber parts according to claim 7, characterized in that: A spray pipe (7) is fixed to the left and right sides of the double swing arm (3) to spray water mist into the sand shield (5); a mist inlet valve (71) is connected to the spray pipe (7).

9. A testing fixture for automotive polymer rubber parts according to claim 8, characterized in that: The inner surface of the explosion-proof glass (52) is coated with a transparent hydrophobic coating.

10. A testing fixture for automotive polymer rubber parts according to claim 8, characterized in that: The bottom of the sand shield (5) is fixed with an annular scraper (54) that is close to the inner surface of the explosion-proof glass (52); the left and right sides of the double swing arm (3) are each equipped with an electric telescopic rod (53) that drives the sliding cover (51) on the same side to move up and down.

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