Explosion-proof concrete and mortar misfire performance testing device

Abstract

The invention relates to a device for testing the misfire performance of explosion-proof concrete and mortar, which is characterized in that a sample block mounting box is horizontally arranged, and a sample block horizontally slides along the sample block mounting box; a sample block can be quickly put in or taken out through the first opening of the sample block mounting box, and the grinding wheel is in contact with the sample block through the second opening of the sample block mounting box; the upper wall and the lower wall of the sample block mounting box constrain and protect the sample block, so that the pressure on the sample block can be basically and completely applied to the grinding wheel; the pressure adjusting assembly applies relatively stable pressure to the sample block in the horizontal direction through a spring with a known stiffness coefficient; during testing, an operator can observe the condition in the box body through the observation opening, the testing result can be determined without the help of a camera or a light sensing part, and the observation effect is more visual. And through the flexible shading ring, the ambient light is shielded when people approach to observe, a darkroom environment in the box body is created, and the safety is good.

Description

Technical Field

[0001] The present invention belongs to the technical field of performance testing of building materials, and particularly relates to a non-sparking performance test device for explosion-proof concrete and mortar. Background Art

[0002] Non-sparking concrete, also known as explosion-proof concrete, is a special type of concrete that can withstand a certain degree of impact and friction without generating sparks. It is mainly used in oil and gas production, transportation, storage and other places, electronic workshops, explosive factories, airport parking lots and military manufacturing and other fields with high-level fire protection, fire prevention and explosion-proof requirements.

[0003] Generally speaking, when a hard object such as metal or stone undergoes mechanical actions such as friction, impact or rubbing with concrete materials, no red-hot sparks or sparks are generated, and there is no danger of causing flammable substances to catch fire or explode, that is, it has non-sparking properties.

[0004] Before non-sparking concrete is put into use, a qualified test report on the non-sparking performance of the material needs to be issued by a third-party agency. At present, the test of the non-sparking performance of concrete materials is generally carried out by grinding test with a grinding wheel in a dark room. The test room should be completely dark so that it is easy to see sparks during the test. However, the current test standards are not very clear. Generally, it is required to make sample blocks of a certain specification, use a grinding wheel with a diameter of 150 mm, the grinding wheel speed is 600-1000 r / min, under a pressure of 10-20 N, grind the sample blocks at night or in a dark room, and observe the generation of sparks during the process of grinding off a certain mass (such as 20 g) of the sample blocks to judge the non-sparking property of the concrete. At present, the demand for non-sparking performance tests is relatively small. A testing agency may only receive a few non-sparking performance test orders in a year. Therefore, instrument companies have no motivation to develop special test equipment. There is still much room for improvement in the control of the pressure and speed of the grinding wheel during the test and the safety guarantee of the operators in the dark room. The test results are greatly affected by the test level of the operator, and there are certain errors.

[0005] In a Chinese patent with the authorization announcement number CN203561573 and the name "An experimental device for the non-sparking performance of concrete and mortar", an experimental device for the non-sparking performance of concrete and mortar is disclosed. By arranging an experimental component inside the box body, a servo motor is arranged on the experimental component. At one end of the box body away from the bottom plate, there is a placement cavity for placing the concrete block to be tested. A light-shielding component is arranged above the placement cavity. At one end of the box body away from the ground, there is a pressing component for pressing the experimental concrete block; it also includes a detection module and an alarm module. The output end of the detection module is connected to the input end of the alarm module; the detection module is used to detect sparks and flying sparks, and the alarm module is used to remind the staff. This solution discovers sparks and flying sparks through the detection module and gives an alarm, which may be different from the judgment standard of the human eye. The imaging effect of capturing the image in the dark room by the camera is poor, and there may be a situation where some tiny flying sparks cannot be displayed or recognized in the camera image; in addition, this solution provides pressure by weights, but does not consider the influence of the self-weight of specimens with different weights on the pressure.

[0006] In a Chinese patent with the authorization announcement number CN213121565 and the name "An experimental device for the non-sparking performance of concrete and mortar", detecting the firelight and flying sparks through the detection module has a high cost. It is not only difficult to apply a constant pressure to the sample block, but also, discovering the sparks and flying sparks through the detection module and giving an alarm may be different from the judgment standard of the human eye, and there is still a high possibility of large errors in the test results.

[0007] In view of this, it is necessary to propose a non-sparking performance test device for explosion-proof concrete and mortar with a simple design structure, stable pressure, not relying on an electronic module to detect sparks and flying sparks, enabling the operator to directly observe the situation during the test with the eyes, and making the judgment of the result more intuitive and accurate. Summary of the Invention

[0008] The purpose of the present invention is to provide a non-sparking performance test device for explosion-proof concrete and mortar with a small volume, a simple structural design, stable control of the pressure of the sample block on the grinding wheel, and capable of testing two samples simultaneously.

[0009] To solve the above technical problems, the present invention discloses a non-sparking performance test device for explosion-proof concrete and mortar, which includes a box body for forming a darkroom environment. A box door is provided at the front of the box body, and a sample block mounting component mounted on the side wall of the box body and a grinding wheel component arranged inside the box body are provided on the box body; the grinding wheel component includes a grinding wheel and an electric component for driving the grinding wheel to rotate, and the disk surface of the grinding wheel faces the box door; the sample block mounting component includes a pressure adjustment component and a sample block mounting box, and the sample block mounting box is horizontally fixed inside the box body; the pressure adjustment component includes an adjusting rod, a locking member for locking the adjusting rod, a spring and a slider arranged inside the sample block mounting box. The adjusting rod passes through the side wall of the box body from the outside to the inside in the horizontal direction and is connected to the spring. The adjusting rod pushes the slider to slide along the sample block mounting box through the spring; a scale is provided on the surface of the adjusting rod;

[0010] A first opening for placing the sample block is provided on one side of the sample block mounting box close to the box door, and a second opening for the sample block to be exposed and contact the grinding wheel is provided on one side of the sample block mounting box close to the grinding wheel;

[0011] During use, open the box door, place the sample block through the first opening, and make one side surface of the sample block contact the outer circumference of the grinding wheel. Push the adjusting rod to make the slider contact the adjusting rod, record the initial scale of the adjusting rod exposed outside the box body when the slider contacts the sample block, and then push the adjusting rod so that the product of the moving distance of the adjusting rod and the spring constant is 10 - 20 N. Lock the adjusting rod with the locking member and record and calculate the moving distance of the adjusting rod, so that the pressure exerted by the slider on the sample block is 10 - 20 N; during the test of subsequent samples of the same batch, the moving distance of the adjusting rod remains the same.

[0012] Preferably, notches are provided on the upper and lower side walls of the second opening, and a part of the grinding wheel extends into the notches; after the sample block is fixed in the sample block mounting box, the middle part of the side of the sample block close to the grinding wheel is exposed from the second opening and contacts the grinding wheel.

[0013] Preferably, the spring constant of the spring is 50 N / m - 200 N / m.

[0014] Preferably, one sample block mounting component is provided on each of the left and right side walls of the box body to test two specifications of samples or test two samples simultaneously.

[0015] Preferably, an observation port for observing the internal situation of the box body during the test is provided on the box door, and an observation window or an observation tube is provided at the observation port; a flexible light-shielding ring adapted to the contour of the human eye is also provided around the outside of the observation port. During the test, the human eye is close to the observation port and contacts the flexible light-shielding ring, so that the human face forms a shield for external light, thereby preventing ambient light from entering the box body to interfere with the test and forming a darkroom environment inside the box body for convenient observation.

[0016] Preferably, a partition plate is detachably arranged in the box body and located in the middle of the front side of the grinding wheel. The partition plate divides the field of view of the observation port into two parts to prevent interference between two sample blocks during simultaneous tests.

[0017] Preferably, when conducting the test, the box door can be opened only after the grinding wheel stops rotating.

[0018] Preferably, the width of the inner accommodating space of the sample block installation box is smaller than the width of the sample block.

[0019] Preferably, the height of the inner accommodating space of the sample block installation box is adapted to the thickness of the sample block, and the height of the inner accommodating space of the sample block installation box is 0.1 - 0.5 cm larger than the thickness of the sample block.

[0020] Preferably, the inner wall of the sample block installation box is processed into a smooth surface or multiple rollers are provided at the bottom of the inner wall of the sample block installation box to reduce the influence of the frictional force between the sample block and the inner wall of the sample block installation box on the pressure received by the grinding wheel.

[0021] The non-sparking performance test device for explosion-proof concrete and mortar of the present invention has at least the following advantages:

[0022] 1. The sample block installation box is horizontally arranged, and the sample block slides horizontally along the sample block installation box; the sample block can be quickly placed or taken out through the first opening of the sample block installation box, which is convenient and efficient; the grinding wheel is brought into contact with the sample block through the second opening of the sample block installation box; the upper and lower walls of the sample block installation box form constraints and protection on the sample block, so that the pressure on the sample block can be basically fully applied to the grinding wheel.

[0023] 2. The pressure adjustment component applies pressure to the sample block horizontally through a spring with a known stiffness coefficient. By adjusting the length required for compressing the spring through a graduated adjusting rod, the pressure on the sample block can be applied more precisely and stably, and the influence of the self-weight of the sample block on the test pressure is preferably excluded. For sample blocks of different weights, the same spring compression length is adopted, which preferably ensures the consistency of conditions such as pressure during the test and effectively reduces test errors.

[0024] 3. One sample block installation component is provided on each of the left and right sides of the grinding wheel, and two sample blocks can be tested at one time, improving the detection efficiency.

[0025] 4. During the test, the operator can observe the situation inside the box body through the observation port without relying on a camera or photosensitive component to determine the test result. The observation effect is more intuitive and the overall cost is lower; through the flexible light-shielding ring, the ambient light is blocked when the person approaches for observation, creating a darkroom environment inside the box. In this way, the requirement for a dark environment in the laboratory during previous tests can be well avoided. The operator can conduct the experiment at any time, with better safety and it is not easy to cause psychological discomfort of the operator due to the darkroom environment. Description of the Drawings

[0026] Figure 1 The figure is a structural diagram of a non-flammable performance test device for explosion-proof concrete and mortar (excluding the box door).

[0027] Figure 2 The present invention is a schematic diagram of the box door structure of a non-flammable performance test device for explosion-proof concrete and mortar.

[0028] Figure 3 This is a structural schematic diagram of a sample block installation box.

[0029] The numbers in the figure are: box body 1, box door 2, grinding wheel 3, pressure adjustment assembly 4, adjusting rod 410, locking piece 420, sleeve 421, bolt 422, spring 430, slider 440, first opening 510, second opening 520, notch 521, front and rear connection 522, sample block mounting box 5, observation port 6, flexible light shielding ring 7, partition 8. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below through examples so that those skilled in the art can implement the invention with reference to the description.

[0031] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0032] like Figures 1-3 As shown, a non-fire performance test device for explosion-proof concrete and mortar comprises a box body 1 for forming a darkroom environment, a box door 2 is provided at the front of the box body 1, a sample block mounting component mounted on the side wall of the box body and a grinding wheel component arranged in the box body are provided on the box body 1; the grinding wheel component comprises a grinding wheel 3 and an electric component for driving the grinding wheel 3 to rotate, and the disk of the grinding wheel 3 faces the box door 2; the sample block mounting component comprises a pressure adjustment component 4 and a sample block mounting box 5, and the sample block mounting box 5 is horizontally fixed in the box body 1; the pressure adjustment component It includes an adjusting rod 410, a locking member 420 for locking the adjusting rod 410, a spring 430 and a slider 440 arranged in the sample block mounting box 5; the locking member 420 is arranged on the outer wall of the box body 1, and the locking member 420 can adopt a spring 430 buckle, an electric lock, etc. In this embodiment, the locking member 420 includes a sleeve 421 and a bolt 422 arranged on the sleeve. The adjusting rod 410 passes through the sleeve sleeve, and the bolt 422 is rotated so that the bolt 422 is against the adjusting rod 410 to lock the adjusting rod 410.

[0033] The adjusting rod 410 passes through the side wall of the box body 1 from the outside to the inside in the horizontal direction and is connected to the spring 430. The adjusting rod 410 pushes the slider 440 to slide along the sample block mounting box 5 through the spring 430; a scale is provided on the surface of the adjusting rod 410. In order to accurately record the rotation speed of the grinding wheel 3 during the test, a display screen for displaying the rotation speed of the grinding wheel 3 can be arranged outside the box body 1 to facilitate the operator to record and make the rotation speed of the grinding wheel 3 as consistent as possible when testing the same batch of samples.

[0034] As Figure 3 shown, a first opening 510 for placing the sample block is provided on one side of the sample block mounting box 5 close to the box door 2, and a second opening 520 for exposing the sample block and contacting the grinding wheel 3 is provided on one side of the sample block mounting box 5 close to the grinding wheel 3;

[0035] During use, open the box door 2, place the sample block from the first opening, and make one side of the sample block contact the outer circumference of the grinding wheel 3. Push the adjusting rod 410 to make the slider 440 contact the adjusting rod 410, record the initial scale of the adjusting rod 410 exposed outside the box body 1 when the slider 440 contacts the sample block, and then push the adjusting rod 410 so that the product of the moving distance of the adjusting rod 410 and the spring constant of the spring 430 is 10-20 N. Lock the adjusting rod 410 with the locking member 420 and record and calculate the moving distance of the adjusting rod 410, so that the pressure applied by the slider 440 to the sample block is 10-20 N; during the subsequent tests of the same batch of samples, the moving distance of the adjusting rod 410 remains consistent. Generally speaking, if the grinding wheel 3 does not show obvious wear and the sample block length is standard, the initial scale displayed by the adjusting rod 410 when the spring 430 contacts the sample block is 0. At this time, the initial scale can be defaulted to 0 without recording.

[0036] As Figure 3As shown, notches 521 are provided on the upper and lower side walls of the second opening, and a part of the grinding wheel 3 extends into the notches 521. After the sample block is fixed in the sample block mounting box 5, the middle part of the side of the sample block near the grinding wheel 3 is exposed from the second opening and contacts the grinding wheel 3. The second opening is preferably not designed to be completely open. The design consideration is that the front and rear connection parts 522 of the side wall where the second opening is located can block the sample block. Before the test starts, there is a certain distance between the sample block and the front and rear connection parts. After the test starts, after grinding for a period of time, the sample block is cut by the grinding wheel 3, and the sample block moves towards the grinding wheel 3 side under the push of the spring 430 until the sample block touches the front and rear connection parts and stops moving (the moving distance of the sample block during the grinding process should be controlled within 15 mm). At this time, the grinding wheel 3 will rotate idly. According to this characteristic, by changing the initial distance between the sample block and the front and rear connection parts after the sample block is installed, the cutting amount of the sample block during the test can be better controlled, and the cutting amount of the sample block can be controlled at 20 g or more. When the operator finds that the grinding noise of the grinding wheel 3 disappears or the rotation speed of the grinding wheel 3 suddenly increases, it can be judged that the sample block touches the front and rear connection parts and the cutting amount is sufficient, and the test is completed. For sample blocks with a larger density, a smaller moving distance of the sample block can reach the required cutting amount. At this time, a spacer can be set on the side of the sample block near the grinding wheel 3 or inside the front and rear connection parts to reduce the necessary moving distance of the sample block.

[0037] The stiffness coefficient of the spring 430 is 50 N / m to 200 N / m. The smaller the stiffness coefficient of the spring 430, the greater the pushing distance of the adjusting rod 410 during the installation of the sample block. In this way, during the test, when the sample block moves closer to the front and rear connection parts, the change in the elastic force of the spring 430 caused by the change in distance is smaller, and the pressure of the sample block on the grinding wheel 3 is more stable.

[0038] A sample block mounting component is provided on each of the left and right side walls of the box body 1 to test two specifications of samples, or to test two samples simultaneously. In this way, two sample blocks can be tested at one time, improving the detection efficiency.

[0039] As Figure 2 As shown, an observation port 6 for observing the internal situation of the box body 1 during the test is provided on the box door 2, and an observation window or an observation cylinder is provided at the observation port 6; a flexible light-shielding ring 7 adapted to the contour of the human eye is also provided around the outside of the observation port 6. During the test, the human eye approaches the observation port 6 and contacts the flexible light-shielding ring 7, so that the human face blocks the external light, thereby preventing the ambient light from entering the box body 1 to interfere with the test and forming a darkroom environment inside the box body 1 for convenient observation.

[0040] A partition 8 is detachably provided in the box body 1 at the middle part in front of the grinding wheel 3. The partition 8 divides the field of view of the observation port 6 into two parts to prevent interference between the two sample blocks during simultaneous testing.

[0041] During the test, the box door 2 can be opened only after the grinding wheel 3 stops rotating to ensure the safety of the operator.

[0042] The width of the inner accommodation space of the sample block mounting box 5 is smaller than the width of the sample block. After the sample block is installed in the sample block mounting box 5, the edge of the sample block near the box door 2 can protrude from the sample block mounting box 5, facilitating the removal of the sample block from the sample block mounting box 5.

[0043] The height of the inner accommodation space of the sample block mounting box 5 is adapted to the thickness of the sample block. The height of the inner accommodation space of the sample block mounting box is 0.1 - 0.5 cm larger than the thickness of the sample block. A certain gap is left in the height of the inner accommodation space of the mounting box so that the sample block can smoothly enter the sample block mounting box 5 while avoiding friction between the sample block and the top of the inner accommodation space of the mounting box.

[0044] The inner wall of the sample block mounting box 5 is processed into a smooth surface or multiple rollers are provided at the bottom of the inner wall of the sample block mounting box 5 to reduce or basically eliminate the influence of the frictional force between the sample block and the inner wall of the sample block mounting box 5 on the pressure received by the grinding wheel 3.

[0045] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A non-flammable performance test device for explosion-proof concrete and mortar, characterized in that: The invention comprises a box for forming a darkroom environment, wherein the front part of the box is provided with a box door, and the box is provided with a sample block installation component installed on the side wall of the box and a grinding wheel component arranged in the box; the grinding wheel component comprises a grinding wheel and an electric component for driving the grinding wheel to rotate, and the disk surface of the grinding wheel faces the box door; the sample block installation component comprises a pressure adjustment component and a sample block installation box, and the sample block installation box is horizontally fixed in the box; the pressure adjustment component comprises an adjustment rod, a locking member for locking the adjustment rod, a spring and a slider arranged in the sample block installation box, the adjustment rod passes through the side wall of the box from the outside to the inside in a horizontal direction and is connected with the spring, and the adjustment rod pushes the slider to slide along the sample block installation box through the spring; the surface of the adjustment rod is provided with a scale; The sample block installation box is provided with a first opening near the box door for placing the sample block therein, and a second opening near the grinding wheel for exposing the sample block therein and contacting the grinding wheel. When in use, open the box door, put the sample block in from the first opening, and make one side of the sample block contact with the outer circumference of the grinding wheel, push the adjusting rod to make the slider contact with the adjusting rod, record the initial scale of the adjusting rod exposed to the outside of the box when the slider contacts with the sample, and then push the adjusting rod so that the product of the moving distance of the adjusting rod and the stiffness coefficient of the spring is 10~20N, make the locking piece lock the adjusting rod and record the calculated moving distance of the adjusting rod, so that the pressure applied by the slider on the sample block is 10~20N; when testing the samples of the same batch subsequently, the moving distance of the adjusting rod shall be kept consistent.

2. The non-fire performance test device for explosion-proof concrete and mortar according to claim 1 is characterized in that: The upper and lower side walls of the second opening are provided with notches, and the grinding wheel partially extends into the notches; after the sample block is fixed in the sample block installation box, the middle part of the sample block near the grinding wheel is exposed from the second opening and contacts the grinding wheel.

3. The non-fire performance test device for explosion-proof concrete and mortar according to claim 1, characterized in that: The spring coefficient is 50N / m to 200N / m.

4. The non-fire performance test device for explosion-proof concrete and mortar according to claim 1, characterized in that: The left and right side walls of the box are each provided with a sample block mounting component to test samples of two specifications, or to test two samples at the same time.

5. The non-flammable performance test device for explosion-proof concrete and mortar according to claim 4, characterized in that: The box door is provided with an observation port for observing the internal situation of the box during the test, and an observation window or an observation tube is provided at the observation port; a flexible shading ring adapted to the contour of human eyes is also provided around the outer side of the observation port. During the test, the human eye is close to the observation port and contacts the flexible shading ring, so that the human face is shielded from external light, thereby preventing ambient light from entering the box to interfere with the test, and forming a darkroom environment in the box for easy observation.

6. The non-fire performance test device for explosion-proof concrete and mortar according to claim 5, characterized in that: The box body is detachably provided with a partition located in the middle of the front side of the grinding wheel, and the partition divides the field of view of the observation port into two parts to prevent mutual interference when two sample blocks are tested simultaneously.

7. The non-fire performance test device for explosion-proof concrete and mortar according to claim 6, characterized in that: During the test, the box door can be opened only after the grinding wheel stops rotating.

8. The non-fire performance test device for explosion-proof concrete and mortar according to claim 1, characterized in that: The width of the accommodation space inside the sample block installation box is smaller than the width of the sample block.

9. The non-fire performance test device for explosion-proof concrete and mortar according to claim 8, characterized in that: The height of the accommodation space inside the sample block installation box is adapted to the thickness of the sample block, and the height of the accommodation space inside the sample block installation box is 0.1 to 0.5 cm greater than the thickness of the sample block.

10. The non-fire performance testing device for explosion-proof concrete and mortar according to claim 1, characterized in that: The inner wall of the sample block installation box is processed into a smooth surface or a plurality of rollers are arranged at the bottom of the inner wall of the sample block installation box to reduce the influence of the friction between the sample block and the inner wall of the sample block installation box on the pressure on the grinding wheel.

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