An on-line testing device for low-temperature performance of deep-cold rubber-plastic material and a control method thereof

Abstract

The application belongs to the technical field of performance testing of rubber and plastic materials, and particularly relates to a device for on-line testing of low-temperature performance of deep-cooled rubber and plastic materials and a control method thereof. The device comprises a rack, conveying chains arranged on the rack, a cold air cylinder and a measuring cylinder. A temperature sensor is arranged in the measuring cylinder. A driving shaft drives the conveying chains to move. The conveying chains are arranged at intervals along the axial direction of the driving shaft. Two ends of the rubber and plastic material are connected to two adjacent conveying chains respectively. The conveying chains comprise a detection section and a rotating section. The cold air cylinder and the measuring cylinder are arranged between the two adjacent conveying chains. The cold air cylinder and the measuring cylinder are arranged on the two sides of the detection section and abut against the two sides of the rubber and plastic material respectively. The device can automatically complete sample feeding, closed refrigeration, measurement and discharging, and realizes on-line continuous and automatic testing of the low-temperature performance of the rubber and plastic material.

Description

Technical Field

[0001] This invention belongs to the field of rubber and plastic material performance testing technology, specifically relating to an online testing device and control method for the low-temperature performance of cryogenic rubber and plastic materials. Background Technology

[0002] Cryogenic rubber and plastic materials not only possess excellent thermal insulation properties but also good cold resistance, making them a common choice for insulation materials in low-temperature environments. To meet the requirements of low-temperature applications, rubber and plastic materials need to undergo low-temperature testing to verify their reliability in cold-temperature service. Current low-temperature performance testing methods for rubber and plastic materials involve using large-area samples with multiple test points. After testing one point, the sample is manually moved to change the test location. This manual movement carries the risk of accidentally touching low-temperature test components, resulting in frostbite. Furthermore, manual sample movement cannot achieve automated continuous feeding or online continuous monitoring by the testing device.

[0003] Therefore, there is an urgent need to design an online low-temperature performance testing device that can realize automatic and continuous sample feeding and testing of rubber and plastic materials. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an online testing device and control method for the low-temperature performance of cryogenic rubber and plastic materials, which can automatically complete sample delivery, closed cooling, measurement and discharge, realizing online continuous automated testing of the low-temperature performance of rubber and plastic materials.

[0005] The specific technical solution adopted in this invention is as follows:

[0006] A cryogenic online testing device for the low-temperature performance of rubber and plastic materials includes a frame, a conveyor belt mounted on the frame, a cooling cylinder, and a measuring cylinder. The openings of the cooling cylinder and the measuring cylinder face each other. The cooling cylinder has an air inlet and an air outlet, and the air inlet of the cooling cylinder is connected to the output end of a cooling device. A temperature sensor is installed inside the measuring cylinder. A drive shaft drives the conveyor belt to move. The conveyor belts are spaced apart along the axial direction of the drive shaft. Both ends of the rubber and plastic material are connected to two adjacent conveyor belts. The conveyor belt includes a detection section and a rotation section. The cooling cylinder and the measuring cylinder are located between two adjacent conveyor belts. The cooling cylinder and the measuring cylinder are located on both sides of the detection section and respectively abut against both sides of the rubber and plastic material.

[0007] The frame is equipped with a telescopic cylinder for measuring cylinder. The axis of the telescopic cylinder is perpendicular to the conveying direction of the detection section. The measuring cylinder has the freedom to move back and forth towards the cooling cylinder by means of the telescopic cylinder.

[0008] The frame is also equipped with a spring push rod, which is located on the same side as the air cooler. The axial direction of the spring push rod is parallel to the axial direction of the telescopic cylinder. The end of the measuring cylinder is provided with a protruding edge, which forms a retraction mechanism for the spring push rod by means of the telescopic cylinder.

[0009] The spring push rod includes a rod body and a spring. The frame is provided with a mounting plate with guide holes. The rod body is axially connected to the mounting plate. The cantilever end of the rod body is located between two adjacent conveyor belts and abuts against the rubber and plastic material. The spring is fitted on the rod body and is located between the mounting plate and the cantilever end. The two ends of the spring abut against the mounting plate and the cantilever end respectively for limiting.

[0010] A set of screws is provided on the conveyor belt. The screws are arranged sequentially at intervals along the moving direction of the conveyor belt. The axial direction of the screws is perpendicular to the moving direction of the conveyor belt. The screws fix the rubber and plastic materials to the conveyor belt with the help of nuts.

[0011] Both the measuring cylinder and the cooling cylinder are insulated cylinders. The measuring cylinder is provided with a wire hole with a sealing ring, and the cable of the temperature sensor is connected to the external signal receiving unit through the sealing ring.

[0012] The exhaust port is connected to the input end of the air conditioning equipment. The air conditioning equipment forms a cold air circuit with the air conditioning cylinder through the air inlet and exhaust port. Valves are respectively installed on the exhaust port and the air inlet.

[0013] A control method for an online testing device for the low-temperature performance of cryogenic rubber and plastic materials includes the following steps:

[0014] S1. Set multiple test points on the rubber and plastic material to be tested, install the rubber and plastic material on the conveyor belt, and drive the drive shaft to move the conveyor belt so that the test points move between the cooling cylinder and the measuring cylinder.

[0015] S2. The telescopic cylinder drives the measuring cylinder to move towards the cooling cylinder. The measuring cylinder and the cooling cylinder respectively abut against the two sides of the test point on the rubber and plastic material and cover the rubber and plastic material. The spring push rod is compressed.

[0016] S3. The air conditioning unit continuously supplies cold air into the air conditioning cylinder;

[0017] S4. The temperature sensor monitors the temperature inside the measuring cylinder and outputs the test temperature to the external signal receiving unit.

[0018] S5. After the preset test duration is reached, the air conditioning equipment stops supplying air to the air conditioning cylinder, the telescopic cylinder drives the measuring cylinder to retract away from the air conditioning cylinder, and the spring push rod resets to push the rubber and plastic material away from the opening of the air conditioning cylinder.

[0019] S6. Drive the conveyor belt to move the next test point on the rubber and plastic material to the space between the cooling cylinder and the measuring cylinder. Repeat steps S2-S6 until the test points of the rubber and plastic material are completed.

[0020] S7. The drive shaft drives the conveyor belt to move in the opposite direction, so that the test points on the rubber and plastic material move in reverse order between the cooling cylinder and the measuring cylinder. Repeat steps S2-S6 to complete the secondary test of each test point. The test of the rubber and plastic material is completed.

[0021] The beneficial effects of this invention are:

[0022] This invention employs multiple rubber and plastic materials mounted on a conveyor belt. A drive shaft drives the conveyor belt to move, and the rubber and plastic materials sequentially pass between a cooling cylinder and a measuring cylinder for low-temperature testing. This achieves continuous testing of the rubber and plastic materials without requiring manual movement, reducing the risk of frostbite from accidental contact with the cooling cylinder. The cooling equipment blows cold air into the cooling cylinder through the air inlet, placing the rubber and plastic materials in a low-temperature environment. The rubber and plastic materials act as heat insulation and sealing materials, isolating the cooling cylinder and the measuring cylinder. The edges of the cooling cylinder and the measuring cylinder squeeze and clamp the rubber and plastic materials, causing slight stretching. The cooling cylinder maintains a preset low temperature. If the temperature inside the measuring cylinder drops suddenly, it indicates that the rubber and plastic materials have cracked and leaked in the low-temperature environment.

[0023] A spring push rod was added. After the test is completed, the measuring cylinder retracts, and the spring push rod resets, pushing the rubber and plastic material away from the opening of the cold air cylinder. This creates a gap between the rubber and plastic material and the cold air cylinder, which facilitates the rapid heating of the cold air cylinder to room temperature, reduces the waiting time for the next test, helps ensure that the initial temperature of each rubber and plastic material is the same, and improves the consistency of the test.

[0024] Each test point is tested twice, so that the test points on each part of the rubber and plastic material undergo a temperature change process of cooling, reheating, and cooling again, so as to test the performance of the rubber and plastic material after temperature fluctuation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 for Figure 1 AA-shaped cross-sectional view;

[0027] Figure 3 for Figure 2 A magnified schematic diagram of part B in the middle;

[0028] Figure 4 This is a schematic diagram of the structure of a cooling air cylinder;

[0029] Figure 5 This is a schematic diagram of the measuring cylinder.

[0030] In the attached diagram, 1 is the frame, 2 is the conveyor belt, 201 is the detection section, 202 is the rotating section, 203 is the screw, 3 is the cooling cylinder, 301 is the air inlet, 302 is the exhaust port, 4 is the measuring cylinder, 401 is the flange, 402 is the sealing ring, 5 is the drive shaft, 6 is the rubber and plastic material, 7 is the telescopic cylinder, 8 is the spring push rod, 801 is the rod body, 802 is the spring, 803 is the cantilever end, 9 is the mounting plate, and 10 is the cable. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0032] Specific implementation examples Figure 1 , Figure 2 As shown, this invention relates to an online testing device for the low-temperature performance of cryogenic rubber and plastic materials, including a frame 1 and a conveyor belt 2 mounted on the frame 1. Multiple sets of matching cooling air cylinders 3 and measuring cylinders 4 are mounted on the frame 1, with the openings of the matching cooling air cylinders 3 and measuring cylinders 4 facing each other. Figure 4 As shown, the air cooler 3 is provided with an air inlet 301 and an exhaust outlet 302. The air inlet 301 of the air cooler 3 is connected to the output end of the air cooling equipment. A temperature sensor is provided inside the measuring cylinder 4. The drive shaft 5 drives the conveyor belt 2 to move. The conveyor belt 2 is spaced apart along the axial direction of the drive shaft 5. The two ends of the rubber and plastic material 6 are respectively connected to two adjacent conveyor belts 2. The middle part of the rubber and plastic material 6 is suspended between two adjacent conveyor belts 2, which facilitates the measuring cylinder 4 and the air cooler 3 to clamp the rubber and plastic material 6 for testing. The conveyor belt 2 includes a detection section 201 and a rotating section 202. The air cooler 3 and the measuring cylinder 4 are located between two adjacent conveyor belts 2. The air cooler 3 and the measuring cylinder 4 are located on both sides of the detection section 201 and respectively abut against both sides of the rubber and plastic material 6 to form a nearly sealed cavity. In this embodiment, the air cooler 3 is located between the detection section 201 and the rotating section 202, and the measuring cylinder 4 is located outside the detection section 201.

[0033] This invention employs multiple rubber and plastic materials 6 mounted on a conveyor belt 2. A drive shaft 5 drives the conveyor belt 2 to move, and the rubber and plastic materials 6 sequentially pass between a cooling cylinder 3 and a measuring cylinder 4 for low-temperature testing, achieving continuous testing of the rubber and plastic materials 6. The cooling equipment blows cold air into the cooling cylinder 3 through the air inlet 301, placing the rubber and plastic materials 6 in a low-temperature environment. The rubber and plastic materials 6 act as heat-insulating and sealing materials, isolating the cooling cylinder 3 and the measuring cylinder 4. A temperature sensor measures the temperature inside the measuring cylinder 4. The edges of the cooling cylinder 3 and the measuring cylinder 4 squeeze and clamp the rubber and plastic materials 6, causing slight stretching of the rubber and plastic materials 6. When the temperature inside the cooling cylinder 3 is maintained at a preset low temperature for a preset duration, the test of the rubber and plastic materials 6 is completed. If the temperature inside the measuring cylinder 4 drops sharply, it indicates that the rubber and plastic materials 6 have cracked and leaked in the low-temperature environment.

[0034] The frame 1 is equipped with a telescopic cylinder 7 for the measuring cylinder 4. The axis of the telescopic cylinder 7 is perpendicular to the conveying direction of the detection section 201. The measuring cylinder 4 has the freedom to move back and forth towards the cooling cylinder 3 with the help of the telescopic cylinder 7. After one test is completed, the telescopic cylinder 7 drives the measuring cylinder 4 to move away from the cooling cylinder 3, which facilitates the conveyor belt 2 to move the rubber and plastic material 6 and reduces the friction between the cooling cylinder 3 and the measuring cylinder 4, thus reducing the wear of the rubber and plastic material 6.

[0035] Furthermore, such as Figure 3 As shown, a spring push rod 8 is also provided on the frame 1. The spring push rod 8 is located on the same side as the cooling air cylinder 3. In the initial state, the cantilever end 803 of the spring push rod 8 extends beyond the plane of the cooling air cylinder 3 and extends towards the measuring cylinder 4. The axial direction of the spring push rod 8 is parallel to the axial direction of the telescopic cylinder 7. Figure 5 As shown, the end of the measuring cylinder 4 is provided with a protruding edge 401. The protruding edge 401 forms a retraction mechanism for the spring push rod 8 by means of the telescopic cylinder 7. During the movement of the measuring cylinder 4 towards the cooling cylinder 3, the measuring cylinder 4 first contacts the rubber and plastic material 6. The protruding edge 401 of the measuring cylinder 4 applies pressure to the spring push rod 8, causing the spring push rod 8 to retract. The measuring cylinder 4 continues to move and covers both sides of the rubber and plastic material 6 with the cooling cylinder 3 respectively. After the test is completed, the measuring cylinder 4 retracts, and the spring push rod 8 resets, pushing the rubber and plastic material 6 away from the opening of the cooling cylinder 3, so that a gap is formed between the rubber and plastic material 6 and the cooling cylinder 3. This facilitates the cooling cylinder 3 to heat up to room temperature quickly, which helps to ensure that the initial temperature of each rubber and plastic material 6 is the same and improves the consistency of the test.

[0036] The spring push rod 8 includes a rod body 801 and a spring 802. The frame 1 is equipped with a mounting plate 9, on which a guide hole for the rod body 801 is provided. The rod body 801 passes through the guide hole and slides along its own axial direction with the mounting plate 9. The cantilever end 803 of the rod body 801 is located between two adjacent conveyor belts 2 and abuts against the rubber-plastic material 6. The spring 802 is fitted onto the rod body 801 and located between the mounting plate 9 and the cantilever end 803. Both ends of the spring 802 abut against and limit the movement of the mounting plate 9 and the cantilever end 803, respectively. When the measuring cylinder 4 pushes the cantilever end 803, the rod body 801 retracts axially, the distance between the cantilever end 803 and the mounting plate 9 decreases, and the spring 802 is compressed. During the retraction of the measuring cylinder 4, the spring 802 releases its elastic potential energy, pushing the rod body 801 back to its original position.

[0037] A set of screws 203 are provided on the conveyor belt 2. The screws 203 are arranged sequentially at intervals along the moving direction of the conveyor belt 2. The axial direction of the screws 203 is perpendicular to the moving direction of the conveyor belt 2. The screws 203 fix the rubber and plastic material 6 to the conveyor belt 2 with the help of nuts. The screws 203 pass through the rubber and plastic material 6. The screws are screwed on the screws 203. The screws 203 and nuts are easy to assemble and disassemble, and can quickly assemble and disassemble the rubber and plastic material 6.

[0038] The measuring cylinder 4 and the cooling cylinder 3 mentioned above are both insulated cylinders, such as Figure 5 As shown, the measuring cylinder 4 is provided with a wire hole, and a sealing ring 402 is provided on the wire hole. The cable 10 of the temperature sensor is connected to the external signal receiving unit through the sealing ring 402. The sealing ring 402 fills the gap between the wire hole and the cable 10, improves the sealing performance of the cylinder wall of the measuring cylinder 4, and reduces the entry of outside air into the measuring cylinder 4, which affects the measurement accuracy of the temperature sensor.

[0039] The exhaust port 302 is connected to the input end of the air conditioning equipment. The air conditioning equipment forms a cold air circuit with the air conditioning cylinder 3 through the air inlet 301 and the exhaust port 302. The air conditioning equipment delivers cold air into the air conditioning cylinder 3 through the air inlet 301. The cold air in the air conditioning cylinder 3 then enters the air conditioning equipment through the exhaust port 302, realizing the recovery and utilization of cold air, which helps to reduce energy consumption. Valves are respectively provided on the exhaust port 302 and the air inlet 301.

[0040] A control method for an online testing device for the low-temperature performance of cryogenic rubber and plastic materials includes the following steps:

[0041] S1. Set multiple test points on the rubber and plastic material 6 to be tested, install the rubber and plastic material 6 on the conveyor belt 2, and drive the conveyor belt 2 to move the test points between the cooling cylinder 3 and the measuring cylinder 4.

[0042] S2, the telescopic cylinder 7 drives the measuring cylinder 4 to move towards the cooling cylinder 3. The measuring cylinder 4 and the cooling cylinder 3 respectively abut against the two sides of the test point on the rubber and plastic material 6 and cover the rubber and plastic material 6. The spring push rod 8 is compressed.

[0043] S3, The air conditioning equipment continuously supplies cold air into the air conditioning cylinder 3;

[0044] S4. The temperature sensor monitors the temperature inside the measuring cylinder 4 and outputs the test temperature to the external signal receiving unit.

[0045] S5. After the preset test duration is reached, the air conditioning equipment stops supplying air to the air conditioning cylinder 3, the telescopic cylinder 7 drives the measuring cylinder 4 to retract away from the air conditioning cylinder 3, and the spring push rod 8 resets to push the rubber and plastic material 6 away from the opening of the air conditioning cylinder 3.

[0046] S6. Drive shaft 5 drives conveyor belt 2 to move, so that the next test point on rubber and plastic material 6 moves between cooling cylinder 3 and measuring cylinder 4. Repeat steps S2-S6 until the test of each test point on rubber and plastic material 6 is completed.

[0047] S7. Drive shaft 5 drives conveyor belt 2 to move in the opposite direction, causing the test points on the rubber and plastic material 6 to move sequentially between the cooling cylinder 3 and the measuring cylinder 4. Repeat steps S2-S6 to complete the secondary test of each test point. The test of the rubber and plastic material 6 is completed. The test points on each part of the rubber and plastic material undergo a temperature change process of cooling, reheating, and recooling. The test is conducted to see if the rubber and plastic material becomes brittle after the temperature fluctuation. If brittleness occurs, cracks will be generated on the rubber and plastic material 6 when it comes into contact with the cover again by the cooling cylinder 3 and the measuring cylinder 4, and the temperature fluctuation inside the measuring cylinder 4 will increase.

[0048] During the test, staff can remove the tested rubber and plastic material 6 from the conveyor belt 2 and install a new rubber and plastic material 6 to be tested. The installation method of screw 203 and nut helps to quickly replace the rubber and plastic material 6 on the conveyor belt 2 within the specified time.

Claims

1. An online testing device for the low-temperature performance of cryogenic rubber and plastic materials, characterized in that: The system includes a frame (1), a conveyor belt (2) mounted on the frame (1), a cooling cylinder (3), and a measuring cylinder (4). The openings of the cooling cylinder (3) and the measuring cylinder (4) face each other. The cooling cylinder (3) is provided with an air inlet (301) and an exhaust outlet (302). The air inlet (301) of the cooling cylinder (3) is connected to the output end of the cooling equipment. A temperature sensor is installed inside the measuring cylinder (4). A drive shaft (5) drives the conveyor belt (2) to move. The conveyor belts (2) are spaced apart along the axial direction of the drive shaft (5). The two ends of the rubber and plastic material (6) are respectively connected to two adjacent conveyor belts (2). The conveyor belts (2) include a detection section (201) and a rotating section (202). The cooling cylinder (3) and measuring cylinder (4) are located between two adjacent conveyor belts (2). The cooling cylinder (3) and measuring cylinder (4) are located on both sides of the detection section (201) and respectively abut against both sides of the rubber and plastic material (6).

2. The online testing device for the low-temperature performance of cryogenic rubber and plastic materials according to claim 1, characterized in that: The frame (1) is provided with a telescopic cylinder (7) for measuring cylinder (4). The axis of the telescopic cylinder (7) is perpendicular to the conveying direction of the detection section (201). The measuring cylinder (4) has the freedom to move back and forth to the cold air cylinder (3) by means of the telescopic cylinder (7).

3. The online testing device for the low-temperature performance of cryogenic rubber and plastic materials according to claim 2, characterized in that: The frame (1) is also provided with a spring push rod (8), which is located on the same side as the air cooler (3). The axial direction of the spring push rod (8) is parallel to the axial direction of the telescopic cylinder (7). The end of the measuring cylinder (4) is provided with a flange (401), which forms a retraction mechanism of the spring push rod (8) by means of the telescopic cylinder (7).

4. The online testing device for the low-temperature performance of cryogenic rubber and plastic materials according to claim 3, characterized in that: The spring push rod (8) includes a rod body (801) and a spring (802). The frame (1) is provided with a mounting plate (9) with a guide hole. The rod body (801) is slidably connected to the mounting plate (9) along its axial direction. The cantilever end (803) of the rod body (801) is located between two adjacent conveyor belts (2) and abuts against the rubber and plastic material (6). The spring (802) is fitted on the rod body (801) and is located between the mounting plate (9) and the cantilever end (803). The two ends of the spring (802) abut against the mounting plate (9) and the cantilever end (803) respectively for limiting.

5. The online testing device for the low-temperature performance of cryogenic rubber and plastic materials according to claim 1, characterized in that: A set of screws (203) is provided on the conveyor belt (2). The screws (203) are arranged sequentially at intervals along the moving direction of the conveyor belt (2). The axial direction of the screws (203) is perpendicular to the moving direction of the conveyor belt (2). The screws (203) fix the rubber and plastic material (6) to the conveyor belt (2) with the help of nuts.

6. The online testing device for the low-temperature performance of cryogenic rubber and plastic materials according to claim 1, characterized in that: The measuring cylinder (4) and the cooling cylinder (3) are both heat-insulating cylinders. The measuring cylinder (4) is provided with a wire hole with a sealing ring (402). The cable (10) of the temperature sensor is connected to the external signal receiving unit through the sealing ring (402).

7. The online testing device for the low-temperature performance of cryogenic rubber and plastic materials according to claim 1, characterized in that: The exhaust port (302) is connected to the input end of the air conditioning equipment. The air conditioning equipment forms a cold air circuit with the air conditioning cylinder (3) through the air inlet (301) and the exhaust port (302). Valves are respectively provided on the exhaust port (302) and the air inlet (301).

8. A control method for an online testing device for the low-temperature performance of cryogenic rubber and plastic materials, used to control the online testing device for the low-temperature performance of cryogenic rubber and plastic materials as described in claim 3, characterized in that: S1. Set multiple test points on the rubber and plastic material (6) to be tested, install the rubber and plastic material (6) on the conveyor belt (2), drive the drive shaft (5) to drive the conveyor belt (2) to move, so that the test points move between the cooling cylinder (3) and the measuring cylinder (4); S2, the telescopic cylinder (7) drives the measuring cylinder (4) to move towards the cold air cylinder (3). The measuring cylinder (4) and the cold air cylinder (3) respectively abut against the two sides of the test point on the rubber and plastic material (6) and cover the rubber and plastic material (6). The spring push rod (8) is compressed. S3, The air conditioning equipment continuously supplies air conditioning into the air conditioning cylinder (3); S4. The temperature sensor monitors the temperature inside the measuring cylinder (4) and outputs the test temperature to the external signal receiving unit. S5. After the preset test duration is reached, the air conditioning equipment stops supplying air to the air conditioning cylinder (3), the telescopic cylinder (7) drives the measuring cylinder (4) to retract away from the air conditioning cylinder (3), and the spring push rod (8) resets to push the rubber and plastic material (6) away from the opening of the air conditioning cylinder (3). S6. Drive shaft (5) drives conveyor belt (2) to move, so that the next test point on the rubber and plastic material (6) moves between the cooling cylinder (3) and the measuring cylinder (4). Repeat steps S2-S6 until the test of each test point on the rubber and plastic material (6) is completed.

9. The control method of the online testing device for low-temperature performance of cryogenic rubber and plastic materials according to claim 8, characterized in that, It also includes the following steps: S7. Drive shaft (5) drives conveyor belt (2) to move in the opposite direction, so that the test points on the rubber and plastic material (6) move in the opposite direction to the air cooler (3) and measuring cylinder (4) in sequence. Repeat steps S2-S6 to complete the secondary test of each test point. The test of the rubber and plastic material (6) is completed.

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