Digital model box for testing dry shrinkage coefficient and temperature shrinkage coefficient of test piece

Abstract

The utility model relates to the field of dry and temperature shrinkage testing of inorganic binder stable materials, in particular to a digital model box for testing dry and temperature shrinkage coefficients of a test piece, the box body comprises an upper cover and a metal bottom plate, testing devices are arranged on the inner wall of the upper cover, the tested piece is surrounded by the testing devices and the metal bottom plate, and the testing devices are connected with the metal bottom plate. A temperature and humidity regulator is further arranged in the box body, all the testing devices, the metal bottom plate and the temperature and humidity regulator are connected with the same computer, an operator only needs to put a tested object into the model box through the device, a dial indicator or a dial indicator is not needed for measurement, the measurement efficiency is improved, and the measurement cost is reduced. Meanwhile, a temperature and humidity regulator is arranged in the box body, so that the tested object can be monitored according to the temperature and humidity of a real application environment, and the matching degree of an experiment result and actual application is higher.

Description

Technical Field

[0001] The utility model relates to the field of dry and temperature shrinkage testing of inorganic binder stabilized materials, in particular to a digital model box for testing dry and temperature shrinkage coefficients of test pieces. Background Art

[0002] Cement stabilized base is the main load-bearing layer in the pavement structure due to its "semi-rigid" structural characteristics. It is also one of the most widely used structural forms in my country's pavement engineering. Because of its good integrity, sufficient mechanical strength and water resistance, it is mostly used in high-grade highway pavements, municipal roads, and airport runways. However, cement stabilized base often has reflective cracks, which leads to cracks in the road, further affecting the service life of the road.

[0003] In the experiment of inorganic binder stabilized materials, the drying shrinkage coefficient and temperature shrinkage coefficient are often used as evaluation indicators of the crack resistance of inorganic binders. Traditional drying and temperature shrinkage experiments use a dial gauge or micrometer to conduct experiments. Daily observation is time-consuming and laborious, and cannot fully reflect the drying shrinkage and temperature shrinkage of various parts of the specimen, which will lead to a large deviation between the experimental results and actual applications. Utility Model Content

[0004] The purpose of the utility model is to provide a digital model box for testing the drying and temperature shrinkage coefficients of test pieces, aiming at the problem that the traditional drying and temperature shrinkage experiments in the prior art use a dial indicator or a micrometer to conduct the experiments, and the daily observation is time-consuming and laborious, and cannot fully reflect the drying shrinkage and temperature shrinkage of various parts of the test piece, which will lead to a large deviation between the experimental results and the actual application.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A digital model box for testing the dry and temperature shrinkage coefficients of a test piece comprises a box body, the box body comprises an upper cover and a metal bottom plate, the inner wall of the upper cover is provided with a testing device, the testing device and the metal bottom plate surround the test piece, the testing device is always in contact with the inner wall of the upper cover, a temperature and humidity adjuster is also provided inside the box body, and each of the testing devices, the metal bottom plate and the temperature and humidity adjuster are connected to the same computer.

[0007] The utility model is a digital model box for testing the dry and temperature shrinkage coefficients of a test piece. The test device is arranged in an upper cover, and the bottom plate is arranged as a metal bottom plate. The whole object to be tested is wrapped by the test device and the metal bottom plate to monitor the shape change of the object to be tested. A temperature and humidity adjuster capable of controlling the temperature and humidity is also arranged in the box body, so that the temperature and humidity in the whole box body are in a stable state. When the object to be tested is affected by the temperature and humidity, the shape of the object to be tested changes. At this time, the test device is in a fitted state with the object to be tested, and can follow the change of the shape of the object to be tested and generate displacement at the same time, so as to ensure that the test device and the object to be tested are tightly fitted. At the same time, the test device can also transmit the degree of deformation to an external computer through a wire, record data through the computer and calculate the dry and temperature shrinkage coefficients of the object to be tested. Through the device, an operator only needs to put the object to be tested into the model box, and does not need to measure through a dial gauge or a micrometer, so as to improve the efficiency of measurement. At the same time, because the temperature and humidity adjuster is arranged in the box body, the object to be tested can be monitored according to the temperature and humidity of the actual application environment, so that the experimental result has a higher matching degree with the actual application.

[0008] As a preferred solution of the utility model, the positions of the test devices on the upper cover relative to the inner wall are the same, so as to avoid the situation where the test devices cannot be changed with the changes of the tested object due to different relative positions inside the upper cover.

[0009] As a preferred embodiment of the present invention, the testing device includes a connecting rod, one end of which is movably connected to a metal contact plate, and the metal contact plate can rotate based on the connecting rod, so that the metal contact plate can tightly fit the surface of the object to be tested by applying external force.

[0010] As a preferred solution of the utility model, a ball head is provided at one end of the connecting rod, and a matching portion is provided at one end of the metal contact plate. The matching portion is adapted to the ball head so that the metal contact plate can move in multiple directions to ensure its fit with the object being measured.

[0011] As a preferred solution of the utility model, a displacement sensor is provided on the ball head, and the rotation direction and movement distance of the metal contact plate can be accurately monitored in real time through the displacement sensor.

[0012] As a preferred solution of the utility model, each of the displacement sensors is connected to a computer, so as to collect deformation data of each surface of the entire measured object, thereby making the experimental results more accurate.

[0013] As a preferred solution of the present invention, one end of the metal contact plate is connected to the connecting rod, and the other end of the metal contact plate is in contact with the measured object.

[0014] As a preferred solution of the present invention, a pressure rod is provided between the metal contact plate and the inner wall of the upper cover, one end of the pressure rod is provided with an elastic component, the end of the pressure rod not provided with the elastic component is connected to the metal contact plate, and the end of the pressure rod provided with the elastic component is connected to the inside of the upper cover. Through the cooperation between the pressure rod and the elastic component, when the object to be measured is deformed and the metal contact plate cannot fit with the surface of the object to be measured, the elastic component will push the pressure rod to ensure that the metal contact plate can fit with the surface of the object to be measured.

[0015] As a preferred solution of the present invention, the elastic component body is a spring.

[0016] As a preferred solution of the utility model, at least four pressure rods are provided between each metal contact plate and the corresponding inner wall of the upper cover, and each pressure rod is connected to the corner of the metal contact plate. By providing four pressure rods and connecting them to the corner points of the metal contact plates, it can be ensured that the pressure rods can monitor the shape changes of the measured object more quickly, thereby adaptively adjusting the metal contact plate.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. The utility model is a digital model box for testing the dry and temperature shrinkage coefficients of test pieces. A test device is arranged in the upper cover, and the bottom plate is arranged as a metal bottom plate. The entire object to be tested is wrapped by the test device and the metal bottom plate to monitor the shape change of the object to be tested. A temperature and humidity adjuster capable of controlling the temperature and humidity is also arranged in the box body, so that the temperature and humidity in the entire box body are in a stable state. When the object to be tested is affected by the temperature and humidity, the shape of the object to be tested changes. At this time, since the test device and the object to be tested are in a fitted state, it can follow the shape of the object to be tested. The change of the shape of the measured object will cause displacement at the same time, ensuring that it fits tightly with the measured object. At the same time, the test device can also transmit the degree of deformation to the external computer through the wire, and the computer records the data and calculates the dry and temperature shrinkage coefficients of the measured object. Through this device, the operator only needs to put the measured object into the model box, without the need to measure it through a dial indicator or a micrometer, which improves the measurement efficiency. At the same time, since the box is equipped with a temperature and humidity adjuster, the measured object can be monitored according to the temperature and humidity of the actual application environment, so that the experimental results are more compatible with the actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the utility model;

[0020] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the connection between the connecting rod and the metal contact plate of the utility model;

[0022] Figure 4 The utility model Figure 2 A partial enlarged view of point A.

[0023] Icons: 1-box; 11-upper cover; 12-metal bottom plate; 2-test device; 21-connecting rod; 211-ball head; 22-metal contact plate; 221-matching part; 23-pressure rod; 231-elastic component; 3-computer; 4-temperature and humidity adjuster. DETAILED DESCRIPTION

[0024] The utility model is described in detail below in conjunction with the accompanying drawings.

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] Example 1

[0027] like Figure 1-2 A digital model box for testing the dry and temperature shrinkage coefficients of a test piece is shown, and the box body 1 is spliced ​​together by a metal bottom plate 12 and an upper cover 11, and a test device 2 is evenly arranged on each inner wall of the upper cover 11, and the test device 2 and the metal bottom plate 12 cover each surface of the tested component, and a temperature and humidity adjuster 4 is also arranged in the box body 1, and the temperature and humidity inside the box body 1 are adjusted by controlling the temperature and humidity adjuster 4, and the test device 2 can be fitted with the surface of the tested object and move with the movement of the tested object, so that when the tested object is shrunk and displaced due to the change of temperature and humidity in the box body 1 during the test, the test device 2 fitted with the tested object is also displaced and the data is transmitted to an external computer 3, and the data is recorded by the computer 3 and the dry and temperature shrinkage coefficients of the tested object are calculated.

[0028] The test device 2 includes a connecting rod 21 connected to the inner wall of the upper cover 11, one end of the connecting rod 21 is provided with a ball head 211, and the ball head 211 is connected to a metal contact plate 22 that can fit the surface of the object to be tested;

[0029] Furthermore, a matching portion 221 is provided at one end of the metal contact plate 22 connected to the connecting rod 21, and the matching portion 221 is connected to the ball head 211 of the connecting rod 21, so that the metal contact plate 22 can rotate around the ball head 211, and a displacement sensor is provided on the ball head 211, and the movement of the metal contact plate 22 around the ball head 211 is monitored by the displacement sensor;

[0030] Furthermore, the displacement sensors are connected to an external computer 3, and the measured data are transmitted to the computer 3 so that the computer can calculate the dry and temperature shrinkage coefficients of the measured object. Figure 2-3 shown.

[0031] As mentioned above, the test device 2 also includes a pressure rod 23, which is arranged between the metal contact plate 22 and the inner wall of the upper cover 11, and each test device 2 is provided with at least four pressure rods 23, one end of the pressure rod 23 is connected to the metal contact plate 22, and the other end is provided with an elastic component 231, which is connected to the inner wall of the upper cover 11 through the elastic component 231, so that when the object to be tested finds a shape change, the elastic component 231 on the pressure rod 23 is deformed accordingly, and the deformation of the elastic component 231 and the ball head 211 of the connecting rod 21 can ensure that the metal contact plate 22 is always in contact with the object to be tested, and the displacement sensor arranged on the ball head 211 can also capture the change of the object to be tested;

[0032] Furthermore, the pressure rod 23 is arranged at the corner of the metal contact plate 22, which can more sensitively capture the shape change of the object being measured, such as Figure 4 shown.

[0033] As mentioned above, the elastic component 231 of the pressure rod 23 is a spring, which is low in cost and easy to replace after being damaged.

[0034] Example 2

[0035] The second embodiment is the use process of the first embodiment, and the model box is mainly used to monitor the inorganic binder. First, the inorganic binder stabilized material specimen is placed on the metal bottom plate 12, and then the upper cover 11 and the metal bottom plate 12 are installed. During the installation, it should be ensured that the specimen is in contact with the metal contact plate 22. After the contact, the temperature and humidity regulator 4 is controlled by the computer 3 to adjust the temperature and humidity in the box to the required values. At this time, the inorganic binder stabilized material specimen changes under the temperature and humidity, and the metal contact plate 22 that is in contact with the upper cover 11 through the elastic component 231 and the ball head 211. The cover 11 is connected. When one end of the metal contact plate 22 cannot fit with the inorganic material, the elastic component 231 can change the length of the pressure rod 23 according to its own elasticity, so that the metal contact plate 22 at one end of the pressure rod 23 can produce different angles of displacement and keep the metal contact plate 22 itself fitting with the inorganic material. At this time, the displacement sensor set on the ball head 211 can measure the distance between itself and the metal contact plate 22, and transmit the data to the external computer 3. The dry and temperature shrinkage coefficients of the inorganic material are obtained through calculation by the computer 3, and a three-dimensional graph of the deformation of the inorganic material is constructed.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A digital model box for testing the dry and temperature shrinkage coefficients of a specimen, comprising a box body (1), wherein the box body (1) comprises an upper cover (11) and a metal bottom plate (12), characterized in that: The inner wall of the upper cover (11) is provided with a testing device (2), the testing device (2) and the metal bottom plate (12) surround the tested object, and the testing device (2) is always in contact with the inner wall of the upper cover (11), and a temperature and humidity adjuster (4) is also provided inside the box (1), and each of the testing devices (2), the metal bottom plate (12) and the temperature and humidity adjuster (4) are connected to the same computer (3).

2. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 1, characterized in that: The upper cover (11) is located at the same position relative to the inner wall where the testing device (2) is arranged.

3. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 1, characterized in that: The testing device (2) comprises a connecting rod (21), one end of which is movably connected to a metal contact plate (22), and the metal contact plate (22) can rotate with the connecting rod (21) as a reference.

4. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 3, characterized in that: A ball head (211) is provided at one end of the connecting rod (21), and a matching portion (221) is provided at one end of the metal contact plate (22), wherein the matching portion (221) is adapted to the ball head (211).

5. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 4, characterized in that: The ball head (211) is provided with a displacement sensor.

6. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 5, characterized in that: Each of the displacement sensors is connected to a computer (3).

7. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 4, characterized in that: One end of the metal contact plate (22) is connected to the connecting rod (21), and the other end of the metal contact plate (22) is in contact with the object to be tested.

8. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 7, characterized in that: A pressure rod (23) is provided between the metal contact plate (22) and the inner wall of the upper cover (11), one end of the pressure rod (23) is provided with an elastic component (231), the end of the pressure rod (23) not provided with the elastic component (231) is connected to the metal contact plate (22), and the end of the pressure rod (23) provided with the elastic component (231) is connected to the inside of the upper cover (11).

9. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 8, characterized in that: The elastic component (231) body is a spring.

10. A digital model box for testing the dry and temperature shrinkage coefficients of test pieces according to claim 9, characterized in that: At least four pressure rods (23) are provided between each metal contact plate (22) and the corresponding inner wall of the upper cover (11), and each pressure rod (23) is connected to a corner of the metal contact plate (22).

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