A heat-resistant and pressure-resistant detection device for heat-resistant rubber sheet for automobiles and a detection method thereof

Abstract

The present application relates to detection equipment technical field, especially to a kind of heat-resistant rubber sheet heat resistance and pressure resistance detection device and detection method for automobile;Including: circulating oven, base, upper clamp and lower clamp;The base is installed in circulating oven;The upper clamp and the lower clamp are symmetrically arranged, and the rubber sheet is clamped;Laser displacement sensor and pressure sensor are arranged in the circulating oven;The laser displacement sensor measures the distance between the end face of the upper clamp and the lower clamp close to each other;The pressure sensor measures the pressure that the extrusion block applies to the upper clamp;The present application is placed on the lower clamp by the rubber sheet, and the upper clamp and the lower clamp clamps the rubber sheet, and circulating oven continues to heat, so that the rubber sheet is in high temperature and under pressure, and then the heat resistance and pressure resistance of the rubber sheet are detected.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to a device and method for testing the heat resistance and pressure resistance of heat-resistant rubber sheets for automobiles. Background Technology

[0002] Heat-resistant rubber sheets for automobiles are key materials for achieving sealing, shock absorption and protection functions in high-temperature environments, and their performance directly affects the reliability and safety of automotive systems. Currently, the mainstream materials include fluororubber (FKM), silicone rubber (VMQ), hydrogenated nitrile rubber (HNBR) and acrylic rubber (ACM).

[0003] Heat resistance performance testing of automotive heat-resistant rubber sheets is often performed using the hot air aging method. The rubber sheet sample is suspended in a forced-ventilation constant-temperature aging chamber and exposed to normal pressure and specified temperature for a specified time. After the rubber sheet is removed, it is conditioned in a standard laboratory environment, and then the changes in the physical properties of the automotive heat-resistant rubber sheet are tested. For the pressure resistance test, pressure is applied to the rubber sheet and maintained for a period of time. After the pressure is released, the change in the thickness of the rubber sheet is measured.

[0004] Existing testing methods separate thermal aging from pressure resistance testing, thus failing to realistically simulate the actual working conditions of automotive rubber sheets (such as engine gaskets and transmission oil seals) under the coupled action of high temperature and continuous compressive force. This separate testing will seriously underestimate the performance degradation of materials in real environments (such as increased compression set and seal failure), thus creating limitations.

[0005] Therefore, we propose a device and method for testing the heat resistance and pressure resistance of heat-resistant rubber sheets for automobiles. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention provides a device and method for testing the heat resistance and pressure resistance of heat-resistant rubber sheets for automobiles, which overcomes the shortcomings of the prior art and aims to solve the problems in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for testing the heat resistance and pressure resistance of automotive heat-resistant rubber sheets, comprising:

[0008] A circulating oven, a base, an upper clamp, and a lower clamp are provided. The base is installed inside the circulating oven. The upper and lower clamps are symmetrically arranged vertically for clamping rubber sheets. A support is provided on the base. Both the upper and lower clamps are mounted on the support. A mounting plate is fixedly connected to the support. A compression screw is screwed onto the mounting plate. A compression block is rotatably connected to the lower end of the compression screw. The compression block can apply pressure to the upper clamp. A laser displacement sensor and a pressure sensor are provided inside the circulating oven. The laser displacement sensor measures the distance between the close-to-each end faces of the upper and lower clamps. The pressure sensor measures the pressure applied to the upper clamp by the compression block.

[0009] Preferably, a mounting block is fixedly connected to the bracket; an extrusion motor is mounted on the mounting block; a connecting sleeve is fixedly connected to the output end of the extrusion motor; a connecting rod is fixedly connected to the extrusion screw; the connecting rod can be inserted into the connecting sleeve and slides with the connecting sleeve.

[0010] By placing a rubber sheet on the lower clamp, which is held in place by the upper and lower clamps, and continuously heating it in a circulating oven, the rubber sheet is subjected to high temperature and pressure, thereby testing its heat resistance and pressure resistance.

[0011] Preferably, the bracket is rotatably connected to the base; a rotating motor is fixedly connected to the base; the rotating motor and the bracket are driven by a gear set; two disc blocks are fixedly connected to the bracket; the upper clamp is slidably connected to the upper disc block; the lower clamp is fixedly connected to the lower disc block; the upper clamp and the lower clamp form a ring on the corresponding disc blocks.

[0012] Preferably, a support frame is fixedly connected to the base; a first rod and a second rod are slidably connected to the support frame; a movable electric push rod is connected between the first rod and the second rod and the support frame; a first sliding block is symmetrically slidably connected to the first rod; an adjusting electric push rod is connected between the first sliding block and the first rod; the laser displacement sensor is divided into a transmitting end and a receiving end, and the transmitting end and the receiving end of the laser displacement sensor are respectively fixedly connected to the two first sliding blocks; a contact rod is installed on one side of the transmitting end and the receiving end of the laser displacement sensor; an electrode plate is fixedly connected to the contact rod; an electrode plate is also fixedly connected to the transmitting end and the receiving end of the laser displacement sensor; the electrode plate on the contact rod is in contact with the electrode plate on the transmitting end and the receiving end.

[0013] Preferably, a connecting block is slidably connected to the extrusion block; a connecting electric push rod is connected between the connecting block and the extrusion block; a second sliding block is slidably connected to the second rod; a telescopic electric push rod is connected between the second sliding block and the second rod; and the pressure sensor is fixedly connected to the second sliding block.

[0014] By encircling the upper and lower clamps around the disc block, the number of rubber sheets that can be clamped is increased. At the same time, by moving the transmitter and receiver of the laser displacement sensor, the transmitter and receiver of the laser displacement sensor are aligned with the upper and lower clamps. Thus, the laser displacement sensor detects the thickness of the rubber sheet. After the second rod and pressure sensor replace the connecting block, they detect the pressure. After the detection is completed, they return to their original positions, the disc block and the rubber sheet rotate, and then the next rubber sheet is detected. Thus, the laser displacement sensor and pressure sensor of this invention can detect multiple rubber sheets, saving costs.

[0015] Preferably, the number of connecting blocks on the extrusion block is two; the two connecting blocks are arranged symmetrically.

[0016] A method for testing the heat resistance and pressure resistance of automotive heat-resistant rubber sheets, applicable to the aforementioned testing device for automotive heat-resistant rubber sheets, comprising the following steps:

[0017] S1. Cut a rubber sheet sample, that is, place the rubber sheet on the lower clamp, the extrusion motor drives the upper clamp to move downward to clamp the rubber sheet, the circulating air box is started to maintain high temperature and the circulating air box is used for ventilation;

[0018] S2. The laser displacement sensor is close to the lower and upper clamps to detect the thickness of the rubber sheet. The pressure sensor is close to the connecting block to detect the force transmitted by the connecting block to the upper clamp to the squeezing block and to detect the pressure on the rubber sheet. After the detection is completed, the disc block drives the rubber sheet to rotate to detect the next rubber sheet.

[0019] S3. After the test is completed, let the rubber sheet cool naturally with the circulating air box, then take out the rubber sheet and use a hardness tester to test its hardness.

[0020] The beneficial effects of this invention are:

[0021] 1. The present invention places a rubber sheet on a lower clamp, which is held in place by the upper and lower clamps, and a circulating oven continuously heats the rubber sheet, subjecting it to high temperature and pressure, thereby testing the heat resistance and pressure resistance of the rubber sheet.

[0022] 2. This invention increases the number of rubber sheets that can be clamped by surrounding the upper and lower clamps around the disc block. Simultaneously, by moving the transmitter and receiver of a laser displacement sensor, the transmitter and receiver are aligned with the upper and lower clamps, allowing the laser displacement sensor to detect the thickness of the rubber sheet. The second rod and pressure sensor, replacing the connecting block, detect the pressure. After detection, they return to their original positions, the disc block and rubber sheet rotate, and the next rubber sheet is detected. Thus, the laser displacement sensor and pressure sensor of this invention can detect multiple rubber sheets, saving costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a heat resistance and pressure resistance testing device for heat-resistant rubber sheets used in automobiles according to the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0026] Figure 4 This is a partial cross-sectional view of the extrusion block and the connecting block in this invention;

[0027] Figure 5 This is a cross-sectional view of the support frame, rod number one, contact rod, and sliding block number one in this invention;

[0028] Figure 6 This is a cross-sectional view of the support frame, rod number two, and sliding block number two in this invention.

[0029] In the diagram: 1. Circulating oven; 11. Base; 12. Upper clamp; 13. Lower clamp; 2. Support; 21. Mounting plate; 22. Extrusion screw; 23. Extrusion block; 24. Laser displacement sensor; 25. Pressure sensor; 26. Mounting block; 27. Extrusion motor; 28. Connecting sleeve; 29. ​​Connecting rod; 3. Rotating motor; 31. Disc block; 4. Support frame; 41. Rod No. 1; 42. Rod No. 2; 43. Moving electric push rod; 44. Sliding block No. 1; 45. Contact rod; 46. Electrode plate; 5. Connecting block; 51. Connecting electric push rod; 52. Sliding block No. 2; 53. Telescopic electric push rod; 54. Adjusting electric push rod. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Refer to the appendix of the instruction manual. Figures 1 to 6 A device for testing the heat resistance and pressure resistance of heat-resistant rubber sheets for automobiles, comprising:

[0032] A circulating oven 1, a base 11, an upper clamp 12, and a lower clamp 13 are provided. The base 11 is installed inside the circulating oven 1. The upper clamp 12 and the lower clamp 13 are symmetrically arranged vertically to clamp a rubber sheet. A bracket 2 is provided on the base 11. The upper clamp 12 and the lower clamp 13 are both installed on the bracket 2. A mounting plate 21 is fixedly connected to the bracket 2. A pressing screw 22 is screwed onto the mounting plate 21. A pressing block 23 is rotatably connected to the lower end of the pressing screw 22. The pressing block 23 can apply pressure to the upper clamp 12. A laser displacement sensor 24 and a pressure sensor 25 are provided inside the circulating oven 1. The laser displacement sensor 24 measures the distance between the close-to-each end faces of the upper clamp 12 and the lower clamp 13. The pressure sensor 25 measures the pressure applied to the upper clamp 12 by the pressing block 23.

[0033] In this invention, a mounting block 26 is fixedly connected to the bracket 2; an extrusion motor 27 is mounted on the mounting block 26; a connecting sleeve 28 is fixedly connected to the output end of the extrusion motor 27; a connecting rod 29 is fixedly connected to the extrusion screw 22; the connecting rod 29 can be inserted into the connecting sleeve 28 and slides with the connecting sleeve 28.

[0034] In this invention, a heat-resistant rubber sheet for automobiles is placed on the lower clamp 13. Then, the extrusion motor 27 drives the connecting sleeve 28 to rotate, causing the connecting rod 29 to drive the extrusion screw 22 to rotate. The extrusion screw 22 rotates downward, thereby pushing the extrusion block 23 and the upper clamp 12 downward, so that the upper clamp 12 and the lower clamp 13 together hold the heat-resistant rubber sheet for automobiles, simulating the scenario when the heat-resistant rubber sheet for automobiles is installed on a car. Then, the door of the circulating oven 1 is closed, and the circulating oven 1 is started again. The circulating oven 1 heats the internal space, so that the internal components and the heat-resistant rubber sheet for automobiles are in a high-temperature environment. Thus, during the testing process, the heat-resistant rubber sheet for automobiles is in a high-temperature and pressure environment. The laser displacement sensor 24 detects the thickness of the rubber sheet, and the pressure sensor 25 detects the pressure on the rubber sheet. Furthermore, by instantaneously adjusting the pressure of the extruded rubber sheet, the thickness change of the rubber sheet can be detected, thereby detecting the elastic change of the rubber sheet.

[0035] The present invention places a rubber sheet on a lower clamp 13, which is held by an upper clamp 12 and a lower clamp 13, and the circulating oven 1 continuously heats the rubber sheet, subjecting it to high temperature and pressure, thereby testing the heat resistance and pressure resistance of the rubber sheet.

[0036] Example 2: Based on Example 1, refer to the appendix of the instruction manual. Figures 1 to 6 In this invention, the bracket 2 is rotatably connected to the base 11; a rotating motor 3 is fixedly connected to the base 11; the rotating motor 3 and the bracket 2 are driven by a gear set; two disc blocks 31 are fixedly connected to the bracket 2; the upper clamp 12 is slidably connected to the upper disc block 31; the lower clamp 13 is fixedly connected to the lower disc block 31; the upper clamp 12 and the lower clamp 13 form a ring on the corresponding disc blocks 31.

[0037] In this invention, a support frame 4 is fixedly connected to the base 11; a first rod 41 and a second rod 42 are slidably connected to the support frame 4; a movable electric push rod 43 is connected between the first rod 41 and the second rod 42 and the support frame 4; a first sliding block 44 is symmetrically slidably connected to the first rod 41; an adjusting electric push rod 54 is connected between the first sliding block 44 and the first rod 41; the laser displacement sensor 24 is divided into a transmitting end and a receiving end, and the transmitting end and the receiving end of the laser displacement sensor 24 are respectively fixedly connected to two first sliding blocks 44; a contact rod 45 is installed on one side of the transmitting end and the receiving end of the laser displacement sensor 24; an electrode plate 46 is fixedly connected to the contact rod 45; an electrode plate 46 is also fixedly connected to the transmitting end and the receiving end of the laser displacement sensor 24; the electrode plate 46 on the contact rod 45 is in contact with the electrode plate 46 on the transmitting end and the receiving end.

[0038] In this invention, a connecting block 5 is slidably connected to the extrusion block 23; a connecting electric push rod 51 is connected between the connecting block 5 and the extrusion block 23; a second sliding block 52 is slidably connected to the second rod 42; a telescopic electric push rod 53 is connected between the second sliding block 52 and the second rod 42; and a pressure sensor 25 is fixedly connected to the second sliding block 52.

[0039] In this invention, since multiple rubber sheets need to be tested simultaneously to form sufficient sample data when testing the heat resistance and pressure resistance of rubber sheets, and the cost of laser displacement sensor 24 and pressure sensor 25 is high, this invention uses a set of laser displacement sensor 24 and pressure sensor 25 to detect the thickness and pressure of all rubber sheets.

[0040] In this invention, a protruding structure is provided at one end of the outer side of the upper clamp 12 and the lower clamp 13. The moving electric push rod 43 pushes out the first rod 41, so that the laser displacement sensor 24 moves towards the upper clamp 12 and the lower clamp 13. Then, the electric push rod 54 is adjusted to push the first sliding block 44, so that the first sliding block 44 moves the transmitting end and the receiving end of the laser displacement sensor 24. When the transmitting end and the receiving end move away from each other, the contact rod 45 contacts the protruding part of the upper clamp 12 and the lower clamp 13, so that the contact rod 45 bends and the electrode plate 46 on the contact rod 45 is disengaged from the electrode plate 46 on the laser displacement sensor 24. The electrode plate 46 is connected to the controller circuit. So after the connection between the two electrode plates 46 is broken, the controller controls the transmitting end and the receiving end of the laser displacement sensor 24 to stop moving. At this time, the distance detected by the laser displacement sensor 24 minus the distance from the protruding part of the upper clamp 12 and the lower clamp 13 to the end face is the real-time thickness of the rubber sheet.

[0041] The moving electric push rod 43 pushes out the second rod 42, causing the pressure sensor 25 to move towards the connecting block 5. When the front end of the second rod 42 moves to the lower end of the extrusion block 23, the connecting electric push rod 51 drives the connecting block 5 to retract into the extrusion block 23. At the same time, the telescopic electric push rod 53 pushes the pressure sensor 25 outward. The upper end of the second rod 42 contacts the extrusion block 23, and the pressure sensor 25 contacts the upper clamp 12. This makes the overall height of the second rod 42 and the pressure sensor 25 the same as the original length of the connecting block 5 protruding from the extrusion block 23. At this time, the second rod 42 and the pressure sensor 25 replace the original connecting block 5 and transmit the force of the extrusion block 23 downward to the upper mold, thereby detecting the pressure on the rubber sheet while extruding the rubber sheet.

[0042] After detecting the thickness of one rubber sheet, the laser displacement sensor 24 retracts, and the pressure sensor 25 and the connecting block 5 return to their original positions. Then, the rotating motor 3 drives the bracket 2, the disc block 31, the upper clamp 12 and the lower clamp 13 to rotate, rotating the remaining rubber sheets to the position of the support frame 4, so that the laser displacement sensor 24 and the pressure sensor 25 can then detect the thickness and pressure of the next rubber sheet.

[0043] This invention increases the number of rubber sheets that can be clamped by surrounding the upper clamp 12 and lower clamp 13 around the disc block 31. At the same time, by moving the transmitter and receiver of the laser displacement sensor 24, the transmitter and receiver of the laser displacement sensor 24 are aligned with the upper clamp 12 and lower clamp 13. Thus, the laser displacement sensor 24 detects the thickness of the rubber sheet. After the second rod 42 and pressure sensor 25 replace the connecting block 5, they detect the pressure. After the detection is completed, they return to their original positions, the disc block 31 and the rubber sheet rotate, and then the next rubber sheet is detected. Thus, the laser displacement sensor 24 and pressure sensor 25 of this invention can detect multiple rubber sheets, saving costs.

[0044] In this invention, there are two connecting blocks 5 on the extrusion block 23; the two connecting blocks 5 are arranged symmetrically.

[0045] In this invention, two connecting blocks 5 are provided on the extrusion block 23. After the second rod 42 and the pressure sensor 25 extend below the extrusion block 23, one connecting block 5 retracts into the extrusion block 23, while the other connecting block 5 remains connected between the upper clamp 12 and the extrusion block 23. Therefore, during the process of the connecting block 5 retracting into the extrusion block 23 and the pressure sensor 25 moving downward, the extrusion block 23 can still transmit force downward through the other connecting block 5, and there will be no interruption in the extrusion of the rubber sheet, thereby reducing the instability caused by the interruption of the extrusion of the rubber sheet during the detection process.

[0046] Example 3: A method for using a heat resistance and pressure resistance testing device for automotive heat-resistant rubber sheets. This method is applicable to the aforementioned heat resistance and pressure resistance testing device for automotive heat-resistant rubber sheets. The steps of this method are as follows:

[0047] S1. Cut a rubber sheet sample by placing the rubber sheet on the lower clamp 13. The extrusion motor 27 drives the upper clamp 12 to move downward to hold the rubber sheet. The circulating air box is started to maintain high temperature and the circulating air box is used for ventilation.

[0048] S2. The laser displacement sensor 24 is close to the lower clamp 13 and the upper clamp 12 to detect the thickness of the rubber sheet. The pressure sensor 25 is close to the connecting block 5 to detect the force transmitted by the connecting block 5 to the upper clamp 12 to the extrusion block 23. After the pressure detection of the rubber sheet is completed, the disc block 31 drives the rubber sheet to rotate to detect the next rubber sheet.

[0049] S3. After the test is completed, let the rubber sheet cool naturally with the circulating air box, then take out the rubber sheet and use a hardness tester to test its hardness.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the heat resistance and pressure resistance of heat-resistant rubber sheets for automobiles, characterized in that: The utility model relates to a kind of rubber sheeting extrusion device, including: Circulating oven (1), base (11), upper clamp (12) and lower clamp (13);The base (11) is installed in circulating oven (1);The upper clamp (12) and the lower clamp (13) are symmetrically arranged, for clamping rubber sheeting;Bracket (2) is provided on the base (11);The upper clamp (12) and the lower clamp (13) are installed on the bracket (2);Mounting disc (21) is fixedly connected on the bracket (2);Extrusion screw (22) is screw-connected on the mounting disc (21);The lower end of extrusion screw (22) is rotatably connected with extrusion block (23);Extrusion block (23) can exert pressure on the upper clamp (12);Laser displacement sensor (24) and pressure sensor (25) are arranged in the circulating oven (1);The laser displacement sensor (24) measures the distance between the end face of the upper clamp (12) and the lower clamp (13) close to each other;The pressure sensor (25) measures the pressure exerted by the extrusion block (23) on the upper clamp (12); The base (11) is fixedly connected with support frame (4);Support frame (4) is slidably connected with a first rod (41) and a second rod (42);The first rod (41) and the second rod (42) are connected with the moving electric push rod (43) between the support frame (4);The first rod (41) is symmetrically slidably connected with a first sliding block (44);The first sliding block (44) is connected with the first rod (41) with the adjusting electric push rod (54);The laser displacement sensor (24) is divided into transmitting end and receiving end, and the transmitting end and the receiving end of the laser displacement sensor (24) are fixedly connected on two first sliding blocks (44) respectively;The transmitting end and the receiving end of the laser displacement sensor (24) are both installed with contact rod (45) on one side;The electrode piece (46) is fixedly connected on the contact rod (45);The transmitting end and the receiving end of the laser displacement sensor (24) are also fixedly connected with electrode piece (46);The electrode piece (46) on the contact rod (45) is in contact with the electrode piece (46) on the transmitting end and the receiving end; Extrusion block (23) is slidably connected with connecting block (5);The connecting block (5) is connected with the connecting electric push rod (51) between the extrusion block (23);The second rod (42) is slidably connected with a second sliding block (52);The second sliding block (52) is connected with the telescopic electric push rod (53) between the second rod (42);The pressure sensor (25) is fixedly connected on the second sliding block (52).

2. The device for testing the heat resistance and pressure resistance of automotive heat-resistant rubber sheets according to claim 1, characterized in that: The support (2) is fixedly connected with a mounting circular block (26); the mounting circular block (26) is mounted with an extrusion motor (27); the output end of the extrusion motor (27) is fixedly connected with a connecting sleeve (28); the extrusion screw rod (22) is fixedly connected with a connecting rod (29); the connecting rod (29) can be inserted into the connecting sleeve (28) and is in sliding fit with the connecting sleeve (28).

3. The heat resistance and pressure resistance testing device for heat-resistant rubber sheet for an automobile according to claim 2, characterized by: The support (2) is rotatably connected to the base (11); the base (11) is fixedly connected with a rotating motor (3); the rotating motor (3) is in transmission with the support (2) through a gear set; the support (2) is fixedly connected with two disc blocks (31); the upper clamp (12) is slidably connected to the upper disc block (31); the lower clamp (13) is fixedly connected to the lower disc block (31); the upper clamp (12) and the lower clamp (13) enclose a ring on the corresponding disc block (31).

4. The heat resistance and pressure resistance testing device for heat-resistant rubber sheet for an automobile according to claim 3, characterized by: The number of the connecting blocks (5) on the extrusion block (23) is two; the two connecting blocks (5) are symmetrically arranged.

5. A method for detecting the heat resistance and pressure resistance of a heat-resistant rubber sheet for an automobile, which is applied to the heat-resistant rubber sheet for an automobile heat resistance and pressure resistance detection device according to any one of claims 1 to 4, characterized by: The steps of the method are as follows: S1, cutting rubber sheet sample, i.e. placing the rubber sheet on the lower clamp (13), the extrusion motor (27) drives the upper clamp (12) to move downward for clamping the rubber sheet, the circulating air bellow is started to keep high temperature and air exchange; S2, the laser displacement sensor (24) is close to the lower clamp (13) and the upper clamp (12) to detect the thickness of the rubber sheet, the pressure sensor (25) is close to the connecting block (5) to detect the force transmitted from the extrusion block (23) to the upper clamp (12) and the pressure of the rubber sheet, after the detection, the disc block (31) drives the rubber sheet to rotate for detecting the next rubber sheet; S3, after the detection, the rubber sheet is naturally cooled with the circulating air bellow, then the rubber sheet is taken out and the hardness is detected by using a hardness tester.

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