WO2016110191A1

WO2016110191A1 - Compression heating detector

Info

Publication number: WO2016110191A1
Application number: PCT/CN2015/098679
Authority: WO
Inventors: 王梦蛟; 戴德盈; 李夕鑫; 王文刚; 胡保敏
Original assignee: 怡维怡橡胶研究院有限公司
Priority date: 2015-01-07
Filing date: 2015-12-24
Publication date: 2016-07-14
Also published as: MY190491A; CN104569041A; CN104569041B

Abstract

Disclosed is a compression heating detector, comprising a detection unit, and the detection unit comprising a perpendicular compression device and a perpendicular compensation device, wherein the perpendicular compression device comprises a transmission motor (37), an eccentric adjusting mechanism, a transmission lever (10) and an upper pressure plate (15), and the transmission motor (37) drives the upper pressure plate (15) to compress a rubber test sample (1) by virtue of the eccentric adjusting mechanism and the transmission lever (10); and the perpendicular compensation device comprises a test sample chassis (12) and a test sample lower chassis (11) which are connected with each other in a universal connection manner, when a lever (22) is unbalanced, the lever (22) is always perpendicular to an adjusting plate (19), and the test sample chassis (12) always applies an upward force perpendicular to the test sample (1).

Description

Compressed heat detector

Technical field

The invention relates to a compression and heat generation detector for rubber materials, in particular to a device for detecting the phenomenon of heat generation of rubber under dynamic alternating load or strain.

Background technique

The phenomenon of heat generation of rubber under dynamic alternating load has always been an indicator of concern to researchers. In practical applications, the internal heat generation of various tires and conveyor belts in high-speed operation, the viscoelastic damping effect of vibration-damping, sound-insulating materials and their structures all involve energy loss analysis caused by material hysteresis.

The existing Goodrich rubber compression and heat tester applies a certain compressive load to the sample through an inert lever system, and applies periodic high frequency compression of the sample to the sample through a transmission system at room temperature or above. The compression fatigue temperature rise and fatigue life of the sample were measured for a certain period of time. Suitable for vulcanized rubber with a hardness of 30-85 IRHD.

The principle of the existing compression heat generator is shown in Fig. 1. The structure diagram is shown in Fig. 2. The distance from the center line of the sample 1 to the lever fulcrum 3 is 127±0.5mm, and the center line of the load weight is 5 to the lever fulcrum. The distance of 3 is 288 ± 0.5 mm. Under the action of the load, the sample is driven by the upper platen to reciprocally compress and generate heat due to the internal resistance of the rubber compound. The compression load of the sample is based on the balance balance compensation principle of the balance, and the balance of the lever is maintained by the lever balance adjusting device 6. The mechanical model is shown in Figure 3. The shortcomings of the existing compressed heat detectors are mainly reflected in:

1. Due to the mechanical construction problem of this test machine, the force of the sample is often uneven during use, and the balance of the balance lever compensates the lower surface of the sample. Because the lever support point and the sample support point do not coincide, when the weight is due to the front and rear When the difference causes the lever to tilt at a certain angle α, the lower surface of the sample is not parallel with the upper surface subjected to the pressure, and the wheel is subjected to the gravity model of the vehicle body, which periodically deviates from the compression of the vehicle body, and cannot accurately simulate the actual work under the experimental conditions. The situation is shown in Figure 4 (the weight of G1 is much larger than G2).

2. The compensation value is not accurate. The compression is in the vertical direction and the compensation is the oblique direction. Similarly, as shown in Fig. 4, the compression of the rubber sample is vertical, but the compensation by the lever is oblique, and the angle between the compensation direction and the vertical compression direction is α.

3. It is not possible to accurately measure the core center temperature in real time. Most of the devices of this construction measure the internal temperature rise by inserting the sample immediately after the completion of the test, and inserting the rubber sample by the needle temperature sensor, and there is a certain temperature loss in this operation. In addition, when the equipment is vulcanized, the temperature sensing wire is embedded or the sample is drilled, and the temperature measuring wire is inserted into the sample. The vulcanization method cannot ensure that the sample is in the vulcanization process, and the temperature line is always at the center of the vulcanized rubber (the sample is squeezed during the vulcanization process, and the excess waste rubber is removed, which causes the temperature line to change and deviate from the center line). The method of punching is especially important for the size of the aperture (the hole is too large, the temperature sensitive line is easy to fall off, the hole is too small, the temperature sensing line cannot be “plugged into the center of the sample”), and the sample is subjected to high frequency during the test. During the process of vibration and compression deformation, the temperature sensing line 7 moves from the position of a in FIG. 5 to the position of b, and the temperature line of the insertion is deviated from the center of the sample due to friction and the like, as shown in FIG. 5.

Summary of the invention

In view of the problems existing in the above existing instruments, the present invention improves the existing Goodrich rubber compression and heat tester, and can improve the force of the sample evenly and overcome the defects of the original equipment.

A compression heat generation detector includes a detection unit including a vertical compression device and a vertical compensation device; the vertical compression device includes a transmission motor, an eccentric adjustment mechanism, a transmission lever, and a sample upper pressure plate. The transmission motor drives the rubber sample by driving the upper platen of the sample through the eccentric adjustment mechanism and the transmission lever; the vertical compensation device comprises a sample chassis and a device connected to the lever, perpendicular to the lever and adjustable up and down (adjustment plate) The universal connection method is adopted between the two.

The sample chassis passes through the bottom of the environmental chamber and is matched with the bottom of the environmental chamber by a linear bearing. The center line of the adjustment disc is in line with the center line of the sample chassis, and the adjustment disc is embedded in the cavity of the lever to adjust the amount of compression through the bottom of the disc. The adjusting screw is connected to the bottom of the lever cavity, and one side of the adjusting disc is provided with a positioning pin on the inner wall of the lever cavity for positioning.

The invention is directed to the problem that the prior art can not accurately measure the core center temperature in real time, and further improves, and the improved device can accurately measure the internal temperature rise of the rubber.

A compression heat generation detector further includes a core temperature sensor synchronization device including a core temperature sensor, a slider, a guide rail, a baffle and a bearing module.

In order to make the temperature measurement point of the core temperature sensor always located at the center position of the sample after punching, the present invention also makes the following improvements:

The core temperature sensor can be moved and adjusted in the vertical direction and the horizontal direction with respect to the sample. Preferably, the present invention adopts a specific design: the guide rail is disposed inside the baffle, and the core temperature sensor is It is fixed to one end of the slider by screws, and the other end of the slider is slidably engaged with the guide rail, and can freely move up and down on the guide rail with the compression of the sample, and an adjustment device for adjusting the horizontal position of the core temperature sensor is arranged outside the baffle. The adjusting device comprises a push-pull handle disposed outside the baffle, a support plate connected to the baffle, a bearing module carrying the support plate, the bearing module is sleeved on the horizontal lead screw, and the horizontal lead screw is fixed by the bracket at the compression On the thermal detector, the front and rear movement of the core temperature sensor can be achieved.

In the above solution, the core temperature sensor synchronizing device is located at the rear side position of the environmental tank.

In the above scheme, the center temperature and the bottom temperature of the sample can be simultaneously detected.

In the above scheme, the bottom temperature is measured by a temperature sensitive sheet placed at the center of the sample chassis.

The compressed heat generating detector of the present invention has the following advantages:

(1) Vertical compression

As shown in FIG. 7 and FIG. 11, when the transmission motor 37 drives the eccentric 29 and the transmission 27 to reciprocate, the sample reciprocating compression test is finally carried out by the upper platen 15 of the sample connected to the transmission lever 10.

(2) Vertical direction compensation

Since the device is placed on the test chassis 12 just after the sample 1, the lever is attached to the front hanging clamp 39, the lever 22 is in an unbalanced state, and in the prior art, the sample chassis and the lever 22 are hardly connected, and the two are always vertical. When the lever 22 is unbalanced, the two faces of the platen 15 and the sample chassis are caused on the sample. The state is not parallel, causing the force applied to the specimen not always vertically upward, as shown in Figures 2 and 4.

In view of this, the present invention improves the original mechanical structure, and changes the hard connection between the sample chassis and the lever 22 in the prior art to a flexible connection, that is, the prior art sample placement chassis 11 is The form of the column is changed to the upper and lower two columns, and the upper and lower columns are contacted by the ball branch and the ball seat. Preferably, the bottom of the upper segment is a convex semicircle, and the other half connected thereto is a concave semicircle, as shown in the figure. 6 and FIG. 11, after the modification, the original sample chassis is divided into upper and lower parts, respectively, a sample chassis 12 and an adjustment plate 19 connected to the lever 22 and vertically adjusted perpendicularly to the lever 22, and a universal joint is used therebetween. In the manner that when the lever is out of balance, the lever 22 is always perpendicular to the adjustment dial 19, and the sample chassis 12 always gives the specimen a vertical upward force, as shown in FIG.

(3) The center temperature and the bottom temperature of the sample 1 can be simultaneously detected, and the core temperature sensor 33 is mounted on the slider 31, and can be moved up and down along the guide rail 9 in Fig. 9 during the compression of the sample to prevent the sample 1 from being compressed. During the deformation process, the deformation core portion temperature sensor 33 is deviated from the position of the core of the sample 1, and the core temperature measuring system is located at the rear side of the environmental tank 25, as shown in FIG.

DRAWINGS

1 is a schematic diagram of the working principle of a compression heat generating detector in the prior art;

2 is a structural diagram of a prior art compression heat detector;

3 is a mechanical model of the equilibrium state of a compression heat generating detector in the prior art;

Figure 4 is a schematic view showing the top and bottom surfaces of the sample in the prior art;

FIG. 5 is a schematic diagram showing changes in position of a temperature measuring line in the prior art; FIG.

Figure 6 is an improvement of the stress imbalance of the sample of the prior art compression heat tester;

Figure 7 is a transmission diagram of the present invention;

Figure 8 is a diagram showing the stress analysis of the improved sample of the present invention;

9 and 10 are intermediate temperature measuring devices of the compressed heat generating detector of the present invention;

Figure 11 is a general assembly drawing of the apparatus of the present invention.

In the figure, 1 is the sample, 3 is the lever fulcrum, 5 is the load weight, 6 is the lever balance adjustment device, 9 is the guide rail, 10 is the transmission lever, 11 is the sample placement chassis, 12 is the sample chassis, 13 is Linear bearing, 15 is the pressure plate on the sample, 17 is the temperature sensor, 19 is the adjustment plate, 20 is the compression adjustment screw, 21 is the positioning pin, 22 is the lever, 24 is the temperature control system, 25 is the environmental box, 27 28 is the transmission device, 29 is the eccentric wheel, 31 is the slider, 32 is the screw, 33 is the core temperature sensor, 34 is the horizontal screw, 35 is the support plate, 36 is the bearing module, 37 is the transmission motor, 38 is After hanging, 39 is the front hanging, 41 is the baffle, 42 is the push-pull handle, 50 is the bracket, 60 is the hand wheel, 61 is the lever balance device, and 62 is the compression amount detecting device.

detailed description

A compression and heat generation detector includes a detection unit including a vertical compression device and a vertical compensation device; the vertical compression device includes a transmission motor 37, an eccentric adjustment mechanism, a transmission lever 10, and a sample pressurization The disk, the drive motor 37 drives the sample upper platen 15 to compress the rubber sample through the eccentric adjustment mechanism and the transmission lever 10; the vertical compensation device includes a sample chassis and is connected to the lever, perpendicular to the lever and adjustable up and down The device (adjustment plate 19) is connected in a universal manner.

The sample chassis 12 passes through the bottom of the environmental chamber and is matched with the bottom of the environmental chamber 25 by a linear bearing 13. The center line of the adjustment disk 19 is in line with the center line of the sample chassis 12, and the adjustment disk 19 is embedded in the cavity of the lever 22. The bottom of the adjusting plate 19 is connected to the bottom of the cavity of the lever 22 by the compression amount adjusting screw 20, and the positioning pin 21 is disposed on one side of the adjusting disk 19 and the inner wall of the cavity of the lever 22.

In the above solution, the force received by the sample 1 is driven by the eccentric wheel 29 to drive the

transmission devices

27 and 28 of the transmission lever 10 when the transmission motor 37 rotates, and finally the reeling of the pressure plate 15 on the sample is performed, thereby making the sample 1 Constantly compressed.

In the above solution, the front hanging clamp 39 and the rear hanging clamp 38 are respectively loaded on both ends of the sample, and the sample 1 is loaded with a certain load due to the difference in weight before and after, and the sample 1 is deformed by the force, causing the lever 22 to be lost. Balancing, the lever balance adjusting device 6 drives the dial 19 to move up and down, thereby ensuring the balance of the lever 22. The lever balance adjusting device 6 includes a lever balancing device 61 that detects and displays the lever state, and a compression amount detecting device 62 that detects and records the amount of compression.

In the above scheme, the bottom temperature rise value of the sample 1 is measured in real time by the temperature sensing sheet 17 placed at the center of the sample chassis 12, and the sample center temperature is measured in real time by the temperature measuring system of FIG.

In the above invention, the center temperature measuring system of the sample 1 is located behind the environmental tank 25 as shown in FIG. 11, and a hole matching the temperature measuring device shutter 41 is dug in the rear side of the environmental box 25. The temperature of the environmental chamber is ensured, the baffle 41 is made of heat insulating material, and the core temperature sensor 33, the slider 31, the guide rail 9, the baffle 41, the support plate 35 and the bearing module 36 constitute a temperature measuring system, and the temperature of the sample center is required. When measuring, it is only necessary to push the system to the environmental chamber so that the baffle 41 is in contact with the outer casing of the environmental tank 25.

The core temperature sensor 33 of the sample center temperature measuring mechanism core temperature is fixed to one end of the slider 31 by a screw 32, and the other end of the slider 31 is slidably engaged with the guide rail 9, and the slider 31 can be freely attached to the guide rail 9 with the compression of the sample. Up and down activities. The upper part of the shell of the compressed heat generating device carries a parallel horizontal lead screw 34 through the bracket 50. The bearing module 36 is sleeved on the horizontal lead screw 34, carries the supporting plate 35 and the temperature measuring system, and the push-pull handle is arranged outside the baffle 41 of the temperature measuring system. 42, the front and rear movement of the core temperature sensor can be achieved by adjusting the push-pull handle.

The core temperature sensor 33 can adjust its position in the thermostatic chamber at will. When the central temperature measurement is required, only the distance between the center of the sample chassis and the inner wall of the baffle 41 is measured, and the extension of the core temperature sensor 33 is adjusted. The length ensures that the temperature measurement point of the core temperature sensor 33 is always located at the center of the sample 1 after the punching, and the core temperature sensor 33 is made of a hard material, which can be easily inserted into the sample drilled in the small hole, and the baffle 41 tightly against the environmental box 25, these are indeed The measurement accuracy of the sample center temperature is guaranteed.

As shown in Fig. 7 and Fig. 11, when the lever is out of balance, the force applied to the sample will change, but due to the presence of the sample chassis 12 and the adjustment disk 19 in Fig. 6, the force of the entire system sample is always vertically upward.

The entire system inspection process:

1. Adjust the eccentric 29 so that the upper platen 15 of the sample is at the highest point inside the environmental chamber 25. At the same time, the adjusting plate 19 is adjusted so that the sample chassis 12 is located at the lowermost end inside the environmental chamber 25, and the sample 1 is reserved most. Place enough sample space.

2. Drill with a drill bit and drill to the center of sample 1.

3. Through the temperature control system 24, the internal temperature of the entire environmental chamber 25 is made uniform to reach the set temperature, and the sample 1 is placed in the environmental chamber 25 for adjustment for 30 minutes.

4. Hold the push-pull handle 42 and pull it away from the environmental box 25, insert the core temperature sensor 33 into the sample hole until the sample center position is reached, push the push-pull handle 42 to the position of the environmental box 25, until the block The plate 41 is in close contact with the environmental tank 25 while the sample is placed vertically on the sample chassis 12.

5. The sample chassis 12 is raised by adjusting the hand wheel 60, and the force is applied to the sample 1. At the same time, the presence of the pressure plate 15 on the sample causes the lever to be balanced, the lever balance device 61 detects and displays, and at the same time, compresses The amount detecting means 62 detects and records the amount of compression to complete the static compression.

6. The adjustment dial 19 is adjusted, the sample chassis 12 is lowered, and the sample 1 is released for a certain stroke. At this time, the lever is unbalanced, and the compression amount detecting means 62 detects and records the amount of compression.

7. The transmission motor 37 is actuated. When the transmission motor 37 drives the eccentric 29 and the transmission 27 to reciprocate, the reciprocating compression test of the sample is finally carried out by the upper platen 15 of the sample connected to the transmission lever 10.

8. The sample bottom temperature sensor and the core temperature sensor 33 located at the center of the sample chassis 12 simultaneously record the temperature change by software.

Claims

A compression and heat generation detector is characterized in that it comprises a detection unit comprising a vertical compression device and a vertical compensation device; the vertical compression device comprises a transmission motor, an eccentric adjustment mechanism, a transmission lever and a sample The pressure plate, the transmission motor drives the rubber sample by the eccentric adjustment mechanism and the transmission lever to drive the pressure plate on the sample; the vertical compensation device comprises a sample chassis and a lower chassis of the sample, and a universal joint is adopted between the two. .
A compressed heat generating detector according to claim 1, further comprising a core temperature sensor synchronizing means comprising a core temperature sensor, a slider, a guide rail, a baffle and a bearing module.
The compressed heat generating detector according to claim 2, wherein the guide rail is disposed inside the baffle, the core temperature sensor is fixed to one end of the slider by a screw, and the other end of the slider is slidably engaged with the guide rail, and the test can be carried out. The compression is free to move up and down on the guide rail, and the outer side of the baffle is provided with an adjusting device for adjusting the horizontal position of the core temperature sensor.
A compression heat generating detector according to claim 3, wherein the adjusting means comprises a push-pull handle disposed outside the baffle, a support plate connected to the baffle, and a bearing module carrying the support plate, the bearing module being sleeved at a level On the lead screw, the horizontal lead screw is fixed to the compression heat detector by a bracket.
A compressed heat generating apparatus according to any one of claims 2 to 4, wherein said core temperature sensor synchronizing means is located at a rear side position of the environmental tank.
The compressed heat generating detector according to claim 1, wherein said compressed heat generating detector simultaneously detects a center temperature and a bottom temperature of the sample.
The compressed heat generating detector according to claim 6, wherein said bottom temperature is measured by a temperature sensitive sheet placed at the center of the sample chassis.