Equipment for measuring bonding strength of dry-mixed mortar

Abstract

The invention discloses dry-mixed mortar bonding strength measuring equipment in the technical field of mortar monitoring, the dry-mixed mortar bonding strength measuring equipment comprises a bottom plate, the top of the bottom plate is provided with a tension assembly and a test block preparation assembly, the test block preparation assembly comprises a partition plate, the bottom of the partition plate is fixedly connected with a supporting column, and the supporting column is rotatably connected with the bottom plate; a plurality of preparation boxes are symmetrically and fixedly connected to the two sides of the partition plate, openings are formed in the sides, close to the partition plate, of the tops of the preparation boxes, iron plates are detachably connected to the sides, away from the partition plate, of the preparation boxes, pull rings are fixedly connected to the sides, away from the partition plate, of the iron plates, and tension sensing assemblies and oscillation assemblies are arranged on the preparation boxes; according to the dry-mixed mortar bonding strength testing device, the bonding strength of multiple dry-mixed mortar in different proportions and the bonding strength of mortar in different molding dates are tested through the preparation box, the electromagnet, the tensile machine and the tension sensor, and the efficiency of testing the bonding strength of the dry-mixed mortar is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mortar detection, and specifically to an equipment for measuring the bonding strength of dry-mixed mortar. Background Art

[0002] Dry-mixed mortar, as a kind of premixed building material, is mainly composed of cementitious materials (such as cement), fine aggregates (such as sand), additives (such as admixtures, mineral admixtures, etc.) mixed in a certain proportion, and is sold and used in the form of dry powder. Compared with the traditional on-site mixed mortar, dry-mixed mortar has the advantages of stable quality, good construction performance, high production efficiency, environmental protection and energy conservation, so it has been widely used in the modern construction industry, especially in high-rise buildings, bridges, tunnels, wall insulation and other fields.

[0003] The bonding strength of dry-mixed mortar, as one of the important indicators to measure its quality performance, is directly related to the structural safety and durability of buildings. The level of bonding strength not only affects the bonding firmness between the mortar and the substrate, but also directly relates to the ability of the mortar to resist damage from external factors (such as temperature changes, humidity changes, load effects, etc.) during long-term use. Therefore, accurately and reliably measuring the bonding strength of dry-mixed mortar is of great significance for ensuring the quality of construction projects and guaranteeing the safety of people's lives and property.

[0004] At present, most of the existing equipment for measuring the bonding strength of mortar directly measures the bonding strength of mortar through a tensile testing machine. When measuring the bonding strength of mortar with different dates and different proportions, separate monitoring is required, which is not conducive to improving the efficiency of measuring the bonding strength of dry-mixed mortar. Therefore, it is necessary to propose an equipment for measuring the bonding strength of dry-mixed mortar. Summary of the Invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide an equipment for measuring the bonding strength of dry-mixed mortar, which realizes the measurement of the bonding strength of dry-mixed mortar with multiple different proportions and the bonding strength of mortar with different molding dates through a preparation box, an electromagnet, a tensile testing machine and a tensile sensor, and improves the efficiency of measuring the bonding strength of dry-mixed mortar.

[0006] In order to achieve the above purpose, the technical solution of the present invention is as follows: An equipment for measuring the bonding strength of dry-mixed mortar, including a bottom plate, and a tensile assembly for providing tensile force for the measurement of the strength of dry-mixed mortar and a test block preparation assembly for preparing dry-mixed mortar test blocks are arranged on the top of the bottom plate;

[0007] The test block preparation assembly includes a partition board. A support column is fixedly connected to the bottom of the partition board, and the support column is rotatably connected to the bottom plate. A number of preparation boxes are symmetrically and fixedly connected to both sides of the partition board. An opening is provided on the top of each preparation box near one side of the partition board. An iron plate is detachably connected to the side of each preparation box away from the partition board. A pull ring is fixedly connected to the side of the iron plate away from the partition board. A tensile sensing assembly for monitoring the bonding strength of the dry mortar and an oscillating assembly for oscillating the mortar are provided on the preparation box. A cavity is provided inside the partition board, and a magnetic attraction assembly for providing magnetic attraction to attract the iron plate is provided in the cavity.

[0008] The principle of the basic solution is as follows: The preparation boxes symmetrically arranged on the partition board are used to prepare mortars with different forming dates. The longitudinally arranged different preparation boxes are used to prepare mortars with different ratios. The bonding strength of mortars with different ratios is measured. Different material test plates can be inserted through the openings to test the bonding strength between different materials and the mortar.

[0009] The beneficial effects of the basic solution are as follows: 1. By arranging multiple preparation boxes on the same partition board, dry mortar test blocks with different ratios or different forming dates can be prepared and tested simultaneously, greatly improving the test efficiency and flexibility.

[0010] 2. The opening design at the top of the preparation box allows the insertion of test plates of various materials, such as metal, plastic, wood, etc., so as to comprehensively evaluate the bonding strength between different materials and the mortar, and improve the universality of the preparation box for testing the bonding strength of the mortar.

[0011] Furthermore, the magnetic attraction assembly includes an electromagnet, and the electromagnet is fixedly connected to the side wall of the cavity. A controller and a display are fixedly connected to the top of the partition board, and the display is signal-connected to the controller.

[0012] The controller is used to control the switch of the electromagnet, and further control the attraction force of the electromagnet on the iron plate.

[0013] The beneficial effects of the basic solution are as follows: Through the attraction of the electromagnet on the iron plate, during the preparation process of the mortar test block, the iron plate can be firmly held on the side of the preparation box away from the partition board, which is beneficial to improving the forming effect of the mortar test block, and the electromagnet can be turned on and off at any time, which is beneficial to improving the flexibility when measuring the bonding strength of the mortar test block.

[0014] Furthermore, the tensile assembly includes a tensile machine. A number of hooks are telescopically connected to the side of the tensile machine near the partition board, and the positions of the hooks correspond to the positions of the pull rings.

[0015] The beneficial effects of the basic solution are as follows: The telescopic hook design on the side of the tensile machine near the partition board is beneficial to hooking preparation boxes at different distances, and the positions of the hooks correspond to the positions of the pull rings, ensuring that the tensile force can directly act on the mortar test block and improving the measurement accuracy of the bonding strength of the mortar test block.

[0016] Furthermore, the tensile force sensing component includes a number of tensile force sensors, which are all fixedly connected inside the pull ring, and the tensile force sensors are signal-connected to the controller.

[0017] The beneficial effects of the basic solution are as follows: The tensile force sensors inside each pull ring can all capture and accurately measure the change in the tensile force value during the stretching process in real time, which is conducive to ensuring the accuracy of the data for measuring the mortar bonding strength and providing a reliable basis for analyzing the mortar bonding strength. The display on the top of the preparation box can display the tensile force data in a timely manner, which is convenient for the operator to directly observe the results and improves the convenience and efficiency of the testing process.

[0018] Furthermore, the oscillation component includes an oscillator, which is fixedly connected to the partition plate, and the oscillation heads of the oscillator are in contact with the side wall of the preparation box.

[0019] The beneficial effects of the basic solution are as follows: By oscillating the mortar in the preparation box with the oscillator, it is conducive to discharging the air bubbles in the mortar, thereby improving the density and uniformity of the mortar, and ensuring the accuracy and reliability of the test results.

[0020] Furthermore, the inner walls between the iron plate and the partition plate in the preparation box are all covered with an anti-sticking coating.

[0021] The beneficial effects of the basic solution are as follows: When the tensile machine applies a tensile force to the pull ring of the iron plate through the hook, frictional forces will be generated between the inner walls between the iron plate and the partition plate in the preparation box and the mortar. Therefore, covering the anti-sticking coating on the inner walls between the iron plate and the partition plate in the preparation box is conducive to reducing the frictional force between the inner walls between the iron plate and the partition plate in the preparation box and the mortar, thereby being conducive to improving the accuracy of the measured mortar bonding strength.

[0022] Furthermore, a timer is fixedly connected to the top of the partition plate, and the timer is used to record the time from the completion of the preparation of the test block to the determination of the bonding strength.

[0023] The beneficial effects of the basic solution are as follows: The timer can record the preparation time of the test block and the curing time after molding, which is conducive to the staff to determine the bonding strength of the mortar test blocks with different curing days.

[0024] Furthermore, pressure sensors are fixedly connected to the inner bottom wall of the preparation box, the pressure sensors are signal-connected to the controller, electric heating wires are fixedly connected to the inner side walls of the preparation box, the electric heating wires are signal-connected to the controller, and the inner and outer walls of the preparation box are all covered with corrosion-resistant materials.

[0025] The beneficial effects of the basic solution are as follows: The pressure sensors can be used to monitor the quality of the mortar placed in the preparation box, which is conducive to ensuring that the quality of the mortar used in the two preparation boxes is the same.

[0026] The electric heating wire heats the mortar, promoting the solidification of the mortar, thereby shortening the time for the staff to measure the strength of the mortar.

[0027] The corrosion-resistant material can effectively resist the erosion of chemical substances in the mortar, which is beneficial to extending the service life of the preparation box, reducing the replacement cost. And after the material of the preparation box is corroded, it will have an adverse effect on the performance of the mortar, which is not conducive to ensuring the accuracy and reliability of the test results.

[0028] Furthermore, a fault alarm is fixedly connected to the top of the tensile machine. The fault alarm is used to give an alarm when the tensile machine suddenly malfunctions or suddenly stops working. The fault alarm is signal-connected to the controller.

[0029] The beneficial effect of the basic scheme is that the fault alarm is used to give an alarm when the tensile machine suddenly malfunctions or stops working, which is beneficial to reminding the staff that the working state of the tensile machine is abnormal and needs to be checked as soon as possible.

[0030] Furthermore, a baffle for dividing the preparation box into an upper chamber and a lower chamber is slidably connected inside the preparation box. A plurality of springs are fixedly connected to the inner bottom wall of the preparation box, and the other ends of the springs are fixedly connected to the baffle; an air delivery pipe is communicated with the bottom of each preparation box, and the other end of the air delivery pipe is communicated with the upper chamber of the adjacent preparation box.

[0031] The beneficial effect of the basic scheme is that through the sliding of the baffle, the gas in the lower chamber of the preparation box can be squeezed into the upper chamber of the adjacent preparation box, thereby promoting the flow of air, improving the efficiency of mortar solidification, and thus reducing the waiting time required for the staff to measure the strength of the mortar. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an axonometric view of the dry mortar bonding strength measuring device in the embodiment of the present invention.

[0033] Figure 2 It is a front view of the dry mortar bonding strength measuring device in the embodiment of the present invention.

[0034] Figure 3 It is a sectional view of the dry mortar bonding strength measuring device in the embodiment of the present invention.

[0035] Figure 4 It is a sectional view of the baffle and the spring in the embodiment of the present invention.

[0036] The reference numerals in the accompanying drawings of the specification include: 1, bottom plate; 2, support column; 3, oscillation head; 4, oscillator; 5, preparation box; 6, display; 7, timer; 8, hook; 9, fault alarm; 10, pull ring; 11, tensile machine; 12, electromagnet; 13, partition plate; 14, baffle; 15, spring; 16, air delivery pipe. Detailed implementation mode

[0037] The following is a further detailed description through specific implementation modes:

[0038] Example 1:

[0039] Basically as shown in the attached Figures 1 - 3 Shown: A dry-mixed mortar bonding strength measuring device, including a bottom plate 1, on the top of the bottom plate 1, there is a tensile force component for providing tensile force for the dry-mixed mortar strength measurement and a test block preparation component for preparing dry-mixed mortar test blocks;

[0040] The test block preparation component includes a partition plate 13, at the bottom of the partition plate 13, there are support columns 2 fixedly connected by bolts, the support columns 2 are rotatably connected to the bottom plate 1, on both sides of the partition plate 13, a number of preparation boxes 5 are symmetrically and fixedly connected by bolts, on the top of the preparation boxes 5 near one side of the partition plate 13, there are openings, on the side of the preparation boxes 5 away from the partition plate 13, there are iron plates detachably connected, on the side of the iron plates away from the partition plate 13, there are pull rings 10 fixedly connected by bolts, on the preparation boxes 5, there is a tensile force sensing component for monitoring the bonding strength of the dry-mixed mortar and an oscillation component for oscillating the mortar, the oscillation component includes an oscillator 4, the oscillators 4 are fixedly connected to the partition plate 13 by screws, and the oscillation heads 3 of the oscillators 4 are in contact with the side walls of the preparation boxes 5.

[0041] There is a cavity inside the partition plate 13, and inside the cavity, there is a magnetic attraction component for providing magnetic attraction to attract the iron plate. The magnetic attraction component includes an electromagnet 12, the electromagnet 12 is fixedly connected to the side wall of the cavity by bolts, on the top of the partition plate 13, there is a controller and a display 6 fixedly connected by bolts, and the display 6 is signal-connected to the controller;

[0042] The controller is used to control the magnitude of the current in the electromagnet 12, and thus control the attraction force of the electromagnet 12 on the iron plate.

[0043] On the top of the partition plate 13, there is a timer 7 fixedly connected by bolts, and the timer 7 is used to record the time from the completion of the preparation of the test block to the measurement of the bonding strength.

[0044] On the inner bottom wall of the preparation boxes 5, there are pressure sensors fixedly connected by bolts, the pressure sensors are signal-connected to the controller, on the inner side walls of the preparation boxes 5, there are heating wires fixedly connected by screws, and the heating wires are signal-connected to the controller. The inner and outer walls of the preparation boxes 5 are covered with corrosion-resistant materials, and the corrosion-resistant material is preferably polypropylene.

[0045] The specific implementation process is as follows: When staff members measure the bonding strength of mortar, they need to select the test plates to be used. Since a number of preparation boxes 5 are symmetrically and fixedly connected to both sides of the partition plate 13, for the preparation boxes 5 on the same horizontal plane, they can be used to measure the bonding strength of mortar with different curing times. For the preparation boxes 5 within the same vertical plane, they can be used to measure the bonding strength of mortar with different proportions. Both the inner and outer walls of the preparation boxes 5 are covered with corrosion-resistant materials, which is conducive to extending the service life of the preparation boxes 5 and reducing the adverse effects on the performance of mortar caused by the corrosion of the materials of the preparation boxes 5.

[0046] First, the staff can put the selected test plate into the preparation box 5 from the opening. Then, the staff starts the electromagnet 12 through the controller, and uses the magnetic attraction generated by the electromagnet 12 to firmly adsorb the iron plate on the outside of the preparation box 5, ensuring that the iron plate will not move or fall off during the pouring and curing processes of the mortar.

[0047] Then, the staff can choose mortars with different proportions and pour them from the openings of different vertical preparation boxes 5 respectively. For mortars that need to test different proportions, different proportions of mortars can be poured into the preparation boxes 5 within the same vertical plane respectively. For mortars that need to test different curing dates, mortars with the same proportion can be poured into the preparation boxes 5 on the same plane simultaneously.

[0048] At this time, the pressure sensor will continuously monitor the pressure changes of the mortar poured into the preparation boxes 5 on the same horizontal plane, and then the controller will display this pressure change on the display 6. The staff can judge the quality of the mortar poured into the preparation boxes 5 on the same horizontal plane by observing the pressure changes in different preparation boxes 5 on the display 6.

[0049] Due to the attracting effect of the electromagnet 12 on the iron plate, since the attracting effect of the electromagnet 12 on the iron plate is the same, the volumes of the preparation boxes 5 within the same horizontal plane will also be the same. At this time, when the staff pours the mortar, they can ensure that the volume of the mortar poured into the preparation boxes 5 is consistent, which is more conducive to measuring the strength of the mortar under different conditions.

[0050] After the mortar is poured into the preparation box 5, the oscillator 4 can be started. The oscillator 4 applies vibration to the side wall of the preparation box 5 through its oscillation head 3 to help the mortar be evenly distributed in the preparation box 5 and discharge air bubbles, improving the density and uniformity of the mortar.

[0051] Finally, the mortar can be left to cure naturally in the preparation box 5. During this process, the staff can record the time from the pouring of the mortar to its curing by observing the timer 7, or record the curing time of the mortar by observing the timer 7.

[0052] By rotating the support column 2, the rotation of the partition plate 13 can be realized, so as to adjust the position of the preparation box 5 on the partition plate 13, and measure the bonding strength of the mortar in the preparation box 5 at different positions, which is beneficial to improving the flexibility of the mortar bonding strength measurement.

[0053] When the staff needs to accelerate the curing of the mortar in the preparation box 5, the electric heating wire can be started through the controller to increase the temperature in the preparation box 5, and the curing of the mortar in the preparation box 5 is promoted by the increase in temperature.

[0054] For the preparation boxes 5 on the same horizontal plane, if the staff only adjusts the temperature increase of one of the preparation boxes 5 to accelerate the curing of the mortar in the preparation box 5, the mortar can reach the strength for measurement faster, so that the strength measurement time of the mortar can be shortened. By controlling the temperature in the preparation box 5, the bonding strength of mortars with different strengths can be measured in a shorter time.

[0055] Embodiment 2:

[0056] The difference from the above embodiment is that the tension assembly includes a tensile testing machine 11. A plurality of hooks 8 are telescopically connected to one side of the tensile testing machine 11 close to the partition plate 13, and the positions of the hooks 8 correspond to the position of the pull ring 10. The tensile force sensing assembly includes a plurality of tensile force sensors, and the tensile force sensors are all fixedly connected inside the pull ring 10 by bolts, and the tensile force sensors are signal-connected to the controller. The inner walls between the iron plates in the preparation box 5 and the partition plate 13 are all covered with an anti-adhesive coating, and the anti-adhesive coating preferably uses a release agent. A fault alarm 9 is fixedly connected to the top of the tensile testing machine 11 by bolts. The fault alarm 9 is used to give an alarm when the tensile testing machine 11 suddenly fails or stops working, and the fault alarm 9 is signal-connected to the controller.

[0057] The specific implementation process is as follows: When measuring the bonding strength of the mortar, first, the hook 8 can be used to hook the hook 8 on the pull ring 10 through telescopic connection, and then the tensile testing machine 11 can be started to apply a tensile force to the pull ring 10 through the hook 8 until the mortar breaks. Since the inner walls between the iron plates in the preparation box 5 and the partition plate 13 are all covered with an anti-adhesive coating, the anti-adhesive coating can reduce the influence of the adhesion between the inner walls of the iron plates in the preparation box 5 and the partition plate 13 and the mortar on the measurement of the bonding strength.

[0058] The tensile force sensor will record the tensile force value in real time and transmit the tensile force value to the controller, and the controller will display the tensile force value on the display 6, and this tensile force value is the bonding strength of the dry mortar.

[0059] When the tensile testing machine 11 fails and causes the tensile testing machine 11 to malfunction or stop working, the controller will control the fault alarm 9 to give an alarm, and the alarm is used to remind the staff to quickly turn off the tensile testing machine 11 and then check the fault of the tensile testing machine 11.

[0060] When it is necessary to measure the bonding strength of mortars with the same proportion but different curing days, it is only necessary to measure the bonding strength of the mortar in the preparation box 5 on the same horizontal plane. Observe the curing time through the timer 7, and the measurement can be carried out after the curing time meets the experimental requirements.

[0061] When it is necessary to measure the bonding strength of mortars with different proportions, it is only necessary to measure the bonding strength of the mortar in the preparation box 5 on the same vertical plane, and apply tensile force through different hooks 8 corresponding to the pull rings 10 in different vertical planes.

[0062] Example 3:

[0063] As Figure 4 shown, the difference from the above embodiment is that baffles 14 for dividing the preparation box 5 into an upper chamber and a lower chamber are slidably connected in the preparation box 5, and a plurality of springs 15 are fixedly connected to the bottom wall of the preparation box 5 by screws, and the other ends of the springs 15 are fixedly connected to the baffles 14 by screws; an air delivery pipe 16 is communicated with the bottom of each preparation box 5, and the other end of the air delivery pipe 16 is communicated with the upper chamber of the adjacent preparation box 5.

[0064] Specific implementation process: The staff will first add mortar into the upper preparation box 5. After the mortar is added, it is necessary to wait for the mortar to solidify for strength testing. Subsequently, the staff can add mortar into the lower preparation box 5. When the mortar is added into the lower preparation box, the baffle 14 will slide down under the action of the gravity of the mortar, thereby squeezing the spring 15. When the baffle 14 slides down, the gas in the lower chamber will be introduced into the upper chamber of the upper preparation box 5 through the air delivery pipe 16, so as to blow the mortar in the upper preparation box 5, and promote air flow through blowing, so as to achieve the effect of promoting the accelerated solidification of the mortar in the upper preparation box 5 and reducing the waiting time required for the staff to measure the mortar strength.

[0065] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0066] The above are only embodiments of the present invention. Specific structures and common knowledge such as characteristics that are well-known in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the invention pertains before the filing date or the priority date, can know all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, perfect and implement this solution in combination with their own abilities. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can also be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope claimed in this application should be based on the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A dry mortar bonding strength measuring device, comprising a bottom plate (1). A tension assembly for providing tension for measuring the strength of dry mortar and a test block preparation assembly for preparing dry mortar test blocks are provided on the top of the bottom plate (1). It is characterized in that: The test block preparation assembly includes a partition plate (13). A support column (2) is fixedly connected to the bottom of the partition plate (13). The support column (2) is rotatably connected to the bottom plate (1). A plurality of preparation boxes (5) are symmetrically and fixedly connected to both sides of the partition plate (13). An opening is provided on one side of the top of each preparation box (5) close to the partition plate (13). An iron plate is detachably connected to one side of each preparation box (5) away from the partition plate (13). A pull ring (10) is fixedly connected to one side of the iron plate away from the partition plate (13). A tension sensing assembly for monitoring the bonding strength of dry mortar and an oscillation assembly for oscillating the mortar are provided on the preparation box (5). A cavity is provided inside the partition plate (13), and a magnetic attraction assembly for providing magnetic attraction to attract the iron plate is provided in the cavity.

2. The dry mortar bonding strength measuring device according to claim 1, characterized in that: The magnetic attraction assembly includes an electromagnet (12). The electromagnet (12) is fixedly connected to the side wall of the cavity. A controller and a display (6) are fixedly connected to the top of the partition plate (13). The display (6) is in signal connection with the controller. The controller is used to control the switch of the electromagnet (12), thereby controlling the attraction of the electromagnet (12) to the iron plate.

3. The dry mortar bonding strength measuring device according to claim 2, characterized in that: The tension assembly includes a tensile testing machine (11). A plurality of hooks (8) are telescopically connected to one side of the tensile testing machine (11) close to the partition plate (13). The positions of the hooks (8) correspond to those of the pull rings (10).

4. The dry mortar bonding strength measuring device according to claim 3, characterized in that: The tension sensing assembly includes a plurality of tension sensors. The tension sensors are all fixedly connected inside the pull rings (10). The tension sensors are in signal connection with the controller.

5. The dry mortar bonding strength measuring device according to claim 4, characterized in that: The oscillation assembly includes an oscillator (4). The oscillators (4) are all fixedly connected to the partition plate (13). The oscillation heads (3) of the oscillators (4) are all in contact with the side walls of the preparation boxes (5).

6. The dry mortar bonding strength measuring device according to claim 5, characterized in that: Anti-sticking coatings are covered on the inner walls between the iron plates and the partition plate (13) inside the preparation boxes (5).

7. The dry mortar bonding strength measuring device according to claim 6, characterized in that: A timer (7) is fixedly connected to the top of the partition plate (13). The timer (7) is used to record the time from the completion of test block preparation to the measurement of bonding strength.

8. The dry mortar bonding strength measuring device according to claim 7, characterized in that: Pressure sensors are fixedly connected to the inner bottom walls of the preparation boxes (5). The pressure sensors are in signal connection with the controller. Electric heating wires are fixedly connected to the inner side walls of the preparation boxes (5). The electric heating wires are in signal connection with the controller. Corrosion-resistant materials are covered on the inner and outer walls of the preparation boxes (5).

9. The dry mortar bonding strength measuring device according to claim 8, characterized in that: A fault alarm (9) is fixedly connected to the top of the tensile testing machine (11). The fault alarm (9) is used to give an alarm when the tensile testing machine (11) suddenly malfunctions or suddenly stops working. The fault alarm (9) is in signal connection with the controller.

10. The dry mortar bonding strength measuring device according to claim 9, characterized in that: A baffle (14) for dividing the preparation box (5) into an upper chamber and a lower chamber is slidably connected inside the preparation boxes (5). A plurality of springs (15) are fixedly connected to the inner bottom walls of the preparation boxes (5). The other ends of the springs (15) are all fixedly connected to the baffle (14). An air delivery pipe (16) is communicated with the bottom of each preparation box (5). The other ends of the air delivery pipes (16) are all communicated with the upper chambers of the adjacent preparation boxes (5).

Images