Mortar concrete impact resistance test device and test method

Abstract

The invention belongs to the technical field of mortar concrete testing, and particularly relates to a mortar concrete impact resistance testing device and a testing method. A mortar concrete impact resistance test device comprises a test rack, an impact module and a measurement control module, and the test rack comprises a test rack bottom plate, a test shield, a test rack bearing beam and a test rack top plate; the impact module comprises an impact ball, an impact hammer, an impact hammer lifting rope, a height adjuster and an impact adjusting mechanism, the impact hammer is arranged over the impact ball and connected with the impact hammer lifting rope, and the impact adjusting mechanism is used for driving the impact hammer lifting rope to ascend and descend to achieve impact of the impact hammer on the impact ball; and the measurement control module comprises a plurality of sample crushing limiting sensors, a high-speed camera and a controller. According to the invention, automatic lifting of the impact hammer in the impact test process, controllable impact height and datamation monitoring of the sample damage state are realized, the automation degree in the test process is high, the manual error is reduced, and the manual test cost and time are saved.

Description

Technical Field

[0001] The invention belongs to the technical field of mortar concrete testing, and in particular relates to a mortar concrete impact resistance testing device and a testing method. Background Art

[0002] Mortar concrete, as a key material widely used in construction projects, plays an indispensable role in all kinds of building structures. The impact resistance of mortar concrete is crucial to the safety and durability of the structure. The mortar concrete impact test is to detect and analyze the damage and energy absorption capacity of the mortar concrete specimen by applying an impact load of a certain energy or impact force. The fundamental purpose of the impact test is to evaluate the resistance and failure mode of mortar concrete when subjected to dynamic impact loads, and to determine the impact strength and toughness of mortar concrete. These key data and indicators will provide solid theoretical support for engineering design, help designers optimize structural solutions, and also provide a clear basis for material selection, ensuring that the mortar concrete material with the best performance is selected in actual projects.

[0003] At present, the common mortar concrete impact test devices are manufactured according to the requirements of the "Technical Specification for Epoxy Resin Mortar" DL / T5193-2021 or the "Fiber Concrete Test Method Standard" CECS 13-2009, which usually include an impact frame, an impact hammer and an impact ball. The existing test devices have some defects during use: (1) The existing test device requires manual lifting of the impact hammer to the required height for each impact. The impact hammer has no vertical constraints, and manual operation errors are large, which increases the test cost and time. When using a large-mass impact hammer, there may be safety hazards such as falling or flying out. (2) The existing test device does not constrain the impact hammer and the impact ball. After the impact hammer falls on the impact ball, it may bounce back to the surface of the sample, causing secondary damage to the sample and affecting the test results. After each impact, the impact ball needs to be manually placed in the middle of the top surface of the sample. The manual placement operation has large errors and wastes time. (3) The observation of sample cracks, the degree of sample damage, and the number of impacts during the impact test were all recorded manually, and the overall measurement accuracy was limited; (4) The overall automation level of the test device is too low, which does not meet the current requirements for efficient and accurate experiments and the industry’s performance expectations for such devices. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a mortar concrete impact resistance testing device and testing method. The device block realizes automatic lifting and lowering of the impact hammer during the impact test, and the impact height is controllable, and the position of the impact ball is accurately supported and fixed. Through the measurement and control module, digital monitoring of the sample destruction state during the impact test is realized. The test process has a high degree of automation, which reduces manual errors and saves manual testing costs and time.

[0005] The technical solution of the present invention is: a mortar concrete impact resistance test device, comprising a test frame, an impact module and a measurement control module, wherein: The test frame comprises a test frame bottom plate, a test area is provided on the top surface above the test frame bottom plate, a test shield is fixedly provided on the outside of the test area, a test frame load-bearing beam is provided on the outside of the test shield near the middle of the test frame bottom plate, and a test frame top plate is provided on the top of the test frame load-bearing beam; The impact module includes an impact ball, an impact hammer, an impact hammer lifting cable, a height adjuster and an impact adjustment mechanism. The impact ball is fixed on the upper surface of the mortar concrete to be tested. An impact hammer is arranged directly above the impact ball. The impact hammer is connected to the impact hammer lifting cable. The height adjuster is fixedly mounted on the load-bearing beam of the test frame. The impact adjustment mechanism is used to drive the impact hammer lifting cable to move up and down to realize the impact of the impact hammer on the impact ball. The measurement control module includes a plurality of sample crushing limit sensors, a high-speed camera and a controller. The sample crushing limit sensors are installed on the inner wall of the test shield, and the high-speed camera is installed on the lower surface of the top plate of the test frame above the test area. The sample crushing limit sensors and the high-speed camera are electrically connected to the controller respectively.

[0006] Two laser-etched scales are arranged in the test area above the test frame bottom plate. The two scales intersect at the center of the test area and are perpendicular to each other. Test frame feet are arranged around the bottom of the test frame bottom plate. The test frame feet are made of stainless steel and rubber laminated.

[0007] The height range of the load-bearing beam of the test frame is 2500mm~3000mm, and a laser-etched scale is provided on the load-bearing beam of the test frame.

[0008] The impact adjustment mechanism includes a first steering pulley, a second steering pulley, a first magnetic block, a second magnetic block, an ascending motor and a descending motor. The first steering pulley is installed on the lower surface of the top plate of the test frame and is located directly above the impact ball. The second steering pulley is installed on the load-bearing beam of the test frame. The ascending motor is installed on the lower surface of the top plate of the test frame and is located directly above the second steering pulley. The descending motor is installed on the upper surface of the bottom plate of the test frame and is located directly below the second steering pulley. One end of the impact hammer lifting cable is fixedly connected to the impact hammer, and the other end passes through the first steering pulley and the second steering pulley in sequence. The steering pulley is connected to the first magnetic block, a second magnetic block is magnetically connected to the bottom of the first magnetic block, second magnetic block ascending ropes are provided on both sides of the second magnetic block, the second magnetic block ascending ropes are connected to the ascending motor, a second magnetic block descending rope is provided on the lower surface of the second magnetic block, the second magnetic block descending rope is connected to the descending motor, a magnetic switching valve is also provided on the second magnetic block, when the magnetic switching valve contacts the wrench on the height adjuster, the second magnetic block and the first magnetic block change from attraction to repulsion, and the ascending motor and the descending motor are electrically connected to the controller respectively.

[0009] A limiting ring is provided on the side of the second diverting pulley away from the load-bearing beam of the test frame.

[0010] The impact hammer is provided with an impact hammer fixing bolt, and the impact hammer is fixedly connected to the impact hammer lifting cable through the impact hammer fixing bolt. The impact ball is a hard steel ball with a diameter range of 63mm~63.5mm. The impact hammer is a steel cube with a mass range of 4kg~20kg.

[0011] The height adjuster is provided with a fastening bolt, and the height adjuster is fixedly connected to the load-bearing beam of the test frame through the fastening bolt.

[0012] A magnetic base is provided at the bottom of the sample crushing limit sensor, and a plurality of magnetic tracks are distributed at equal distances on the inner side wall of the test shield of the test area according to the sample height, and the magnetic base is slidably connected to the magnetic track.

[0013] Two impact ball positioning supports are symmetrically arranged on the inner side of the test shield. A spring is arranged on the side of the impact ball positioning support close to the inner wall of the test shield. The side of the impact ball positioning support close to the impact ball is arc-shaped. The two impact ball positioning supports support and fix the impact ball.

[0014] A mortar concrete impact resistance test method, using the mortar concrete impact resistance test device as described above, comprises the following steps: S1: Prepare mortar concrete specimens of specified size and shape according to standard specifications, cure the specimens to the specified age, take them out, place them in the test room where the test device is located, adjust the test room temperature to a standard test environment of 23℃±2℃ and relative humidity of 50%±5%, and adjust for 24h; S2: Place the specimen in the test area on the bottom plate of the test frame, center the specimen, and then install the test shield; S3: Install the specimen crushing limit sensor on the inner wall of the test shield according to the specimen size, and place the impact ball in the middle of the top surface of the specimen; S4: Adjust the position of the height adjuster on the load-bearing beam of the test frame according to the impact test height; S5: Start the impact adjustment mechanism and start the impact test. The specific process of a single impact test cycle is as follows: First, the descending motor is started, and the second magnetic block and the first magnetic block are driven to descend through the descending rope of the second magnetic block, and the impact hammer is raised; when the second magnetic block descends to the point where the magnetic conversion valve contacts the height adjuster, the second magnetic block completes the magnetic conversion, and the second magnetic block and the first magnetic block change from attraction to repulsion, and the first magnetic block, the impact hammer lifting rope, and the impact hammer change from a restrained state to a relaxed state, and the impact hammer drops to impact the impact ball, completing an impact test on the sample; after the impact is completed, the descending motor stops working, and the ascending motor starts, and the second magnetic block is driven to ascend through the ascending rope of the second magnetic block, and when it rises to the point where the magnetic conversion valve of the second magnetic block is separated from the height adjuster, the magnetism of the second magnetic block is again converted to an attractive state with the first magnetic block, and the second magnetic block continues to rise with the ascending rope of the second magnetic block until it contacts and adsorbs the first magnetic block, and the ascending motor stops working, and then the descending motor continues to start, and the next impact test cycle is carried out; S6: During the entire impact test cycle, the controller keeps the sample crushing limit sensor and the high-speed camera working continuously. The sample crushing limit sensor is used to monitor whether the dimensional change during the impact test reaches the specification requirement value. The high-speed camera is used to observe the crack expansion and crushing conditions on the surface of the specimen in each impact test cycle. When the high-speed camera observes the first crack on the surface of the specimen, the controller records the impact number at this time as the initial crack impact number; when the sample crushing limit sensors on the three surfaces alarm at the same time or the high-speed camera observes the sample cracking, it indicates that the specimen has been destroyed, and the test ends. The controller records the impact number at this time as the destruction impact number; S7: The number of impact test cycles of the sample is recorded through the controller, and the impact energy consumption of the mortar concrete against initial cracking and the impact energy consumption against destruction are calculated according to the requirements of the specification.

[0015] The technical effects of the present invention are: 1. The present invention cooperates with an ascending motor, a descending motor, a first magnetic block, a second magnetic block and a height adjuster. When the impact hammer is in rigid contact with the impact ball, the first magnetic block contacts the limit ring on the second steering pulley, and the descending distance of the impact hammer is equal to the ascending distance of the first magnetic block. At this time, the impact hammer stops moving after completing the rigid impact and does not continue to descend, thereby realizing automatic lifting and lowering of the impact hammer during the impact test and controllable impact height, reducing manual errors and saving manual test costs and time; 2. The present invention realizes precise support and fixation of the impact ball position through symmetrically arranged impact ball positioning supports, and monitors the destruction state of the sample during the impact test through the measurement control module. The test process has a high degree of automation and reduces manual errors; 3. On the inner wall of the test shield in the test area of ​​the present invention, a plurality of magnetic tracks are equidistantly distributed according to the sample height, and are slidably connected to the magnetic track through a magnetic base, so that the installation is quick and convenient and the adjustment is easy.

[0016] The following is a further description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a structural front view of a mortar concrete impact resistance testing device according to an embodiment of the present invention.

[0018] Figure 2 The present invention is a top view of the structure of a mortar concrete impact resistance testing device according to an embodiment of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the impact ball positioning support structure according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the structure of the sample crushing limit sensor according to an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of the laser scale lines of the test stand bottom plate and the magnetic base according to an embodiment of the present invention.

[0022] Figure markings: 101-test frame bottom plate, 102-test shield, 103-test frame load-bearing beam, 104-test frame top plate, 105-test frame foot, 201-impact ball, 202-impact hammer, 203-impact hammer fixing bolt, 204-impact hammer lifting cable, 205-first steering pulley, 206-second steering pulley, 207-first magnetic block, 208-second magnetic block, 209-height adjuster, 210-fastening bolt, 211-ascending motor, 212-second magnetic block ascending cable, 213-second magnetic block descending cable, 214-descending motor, 215-impact ball positioning support, 301-magnetic rail, 302-magnetic base, 303-sample crushing limit sensor, 304-high-speed camera, 305-controller. DETAILED DESCRIPTION Example 1

[0023] like Figure 1~Figure 5 As shown, a mortar concrete impact resistance test device includes a test frame, an impact module and a measurement control module, wherein: The test frame comprises a test frame bottom plate 101, a test area is provided on the top surface above the test frame bottom plate 101, a test shield 102 is fixedly provided on the outside of the test area, a test frame load-bearing beam 103 is provided on the outside of the test shield 102 near the middle of the test frame bottom plate 101, and a test frame top plate 104 is provided on the top of the test frame load-bearing beam 103; The impact module includes an impact ball 201, an impact hammer 202, an impact hammer lifting cable 204, a height adjuster 209 and an impact adjustment mechanism. The impact ball 201 is fixed on the upper surface of the mortar concrete to be tested. The impact hammer 202 is arranged directly above the impact ball 201. The impact hammer 202 is connected to the impact hammer lifting cable 204. The height adjuster 209 is fixedly installed on the load-bearing beam 103 of the test frame. The impact adjustment mechanism is used to drive the impact hammer lifting cable 204 to move up and down to realize the impact of the impact hammer 202 on the impact ball 201. The measurement control module includes multiple sample breakage limit sensors 303, a high-speed camera 304 and a controller 305. The sample breakage limit sensors 303 are installed on the inner wall of the test shield 102, and the high-speed camera 304 is installed on the lower surface of the test frame top plate 104 above the test area. The sample breakage limit sensors 303 and the high-speed camera 304 are electrically connected to the controller 305 respectively.

[0024] In actual use, the present invention places the sample in the test area on the test frame bottom plate 101, places the sample in the center, and then installs the test shield 102; the sample crushing limit sensor 303 is installed on the inner wall of the test shield 102 according to the size of the sample. Place the impact ball 201 in the middle of the top surface of the sample; adjust the position of the height adjuster 209 on the load-bearing beam 103 of the test frame according to the impact test height; start the impact adjustment mechanism and start the impact test; during the entire impact test cycle, the sample crushing limit sensor 303 and the high-speed camera 304 are continuously operated through the controller 305. The sample crushing limit sensor 303 is used to monitor whether the dimensional change during the impact test reaches the required value of the specification, and the high-speed camera 304 is used to observe the crack expansion and crushing of the surface of the specimen in each impact test cycle. When the sample crushing limit sensors 303 on the three surfaces alarm at the same time and the high-speed camera 304 observes that the sample is cracked or the specimen has been damaged, the test is terminated; the number of impact test cycles of the sample is recorded through the controller 305, and the anti-initial crack impact energy consumption and anti-destruction impact energy consumption of the mortar concrete are calculated according to the specification requirements. The present invention realizes automatic lifting and lowering of the impact hammer and controllable impact height during the impact test, and accurate support and fixation of the impact ball position. Through the measurement control module, digital monitoring of the destruction state of the sample during the impact test is realized. The test process has a high degree of automation, reduces manual errors, and saves manual test costs and time. Example 2

[0025] Preferably, on the basis of Example 1, in this embodiment, two laser-etched scales are provided in the test area above the test frame base plate 101, the two scales intersect at the center of the test area and are perpendicular to each other, and test frame feet 105 are respectively provided around the bottom of the test frame base plate 101, and the test frame feet 105 are made of stainless steel and rubber stacked together.

[0026] During actual use, two laser-etched scales are provided in the test area above the bottom plate 101 of the test frame of the present invention. The two scales intersect at the center of the test area and are perpendicular to each other, so as to facilitate the rapid centering of the sample. The test frame foot 105 is made of stainless steel and rubber stacking. During the impact test, the rubber layer absorbs the impact energy and eliminates the damage to the ground caused by the test. Example 3

[0027] Preferably, on the basis of Example 1 or Example 2, in this embodiment, the height range of the test frame load-bearing beam 103 is 2500 mm to 3000 mm, and the test frame load-bearing beam 103 is provided with a laser-etched scale.

[0028] During actual use, the load-bearing beam 103 of the test frame of the present invention is provided with a laser-etched scale to facilitate adjustment of the height of the height adjuster 209 . Example 4

[0029] Preferably, on the basis of Example 1 or Example 3, in this embodiment, the impact adjustment mechanism includes a first steering pulley 205, a second steering pulley 206, a first magnetic block 207, a second magnetic block 208, an ascending motor 211 and a descending motor 214, the first steering pulley 205 is installed on the lower surface of the test frame top plate 104, located directly above the impact ball 201, the second steering pulley 206 is installed on the test frame load-bearing beam 103, the ascending motor 211 is installed on the lower surface of the test frame top plate 104, located directly above the second steering pulley 206, the descending motor 214 is installed on the upper surface of the test frame bottom plate 101, located directly below the second steering pulley 206, one end of the impact hammer lifting cable 204 is fixedly connected to the impact hammer 202, and the other end is sequentially connected to the impact hammer 202. It passes through the first steering pulley 205 and the second steering pulley 206 and is connected to the first magnetic block 207. The second magnetic block 208 is magnetically connected to the bottom of the first magnetic block 207. Second magnetic block ascending ropes 212 are provided on both sides of the second magnetic block 208. The second magnetic block ascending rope 212 is connected to the ascending motor 211. The lower surface of the second magnetic block 208 is provided with a second magnetic block descending rope 213, and the second magnetic block descending rope 213 is connected to the descending motor 214. The second magnetic block 208 is also provided with a magnetic conversion valve. When the magnetic conversion valve contacts the wrench on the height adjuster 209, the second magnetic block 208 and the first magnetic block 207 change from attraction to repulsion. The ascending motor 211 and the descending motor 214 are electrically connected to the controller 305 respectively.

[0030] During actual use, the present invention starts the impact adjustment mechanism and starts the impact test. The specific process of a single impact test cycle is as follows: first, the descending motor 214 is started, and the second magnetic block 208 and the first magnetic block 207 are driven to descend through the second magnetic block descending rope 212, and the impact hammer 202 is raised; when the second magnetic block 208 descends to the point where the magnetic conversion valve contacts the height adjuster 209, the second magnetic block 208 completes the magnetic conversion, and the second magnetic block 208 and the first magnetic block 207 change from attraction to repulsion, and the first magnetic block 207, the impact hammer lifting rope 204, and the impact hammer 202 change from a constrained state to a relaxed state, and the impact hammer 202 falls. Impact the impact ball 201 to complete an impact test on the sample; after the impact is completed, the descending motor 214 stops working, and the ascending motor 211 starts, and the second magnetic block 208 is driven to rise through the second magnetic block ascending rope 212. When it rises to the second magnetic block 208, the magnetic conversion valve is separated from the height adjuster 209, and the magnetism of the second magnetic block 208 is converted to the state of attraction with the first magnetic block 207 again. When the second magnetic block 208 continues to rise with the second magnetic block ascending rope 212 until it contacts and adsorbs with the first magnetic block 207, the ascending motor 211 stops working, and then the descending motor 214 continues to start, and the next impact test cycle is carried out. The present invention cooperates with an ascending motor, a descending motor, a first magnetic block, a second magnetic block and a height adjuster. When the impact hammer is in rigid contact with the impact ball, the first magnetic block contacts the limiting ring on the second steering pulley, and the descending distance of the impact hammer is equal to the ascending distance of the first magnetic block. At this time, the impact hammer stops moving after completing the rigid impact and does not continue to descend, thereby realizing automatic lifting and lowering of the impact hammer during the impact test and controllable impact height, reducing manual errors, and saving manual test costs and time. Example 5

[0031] Preferably, on the basis of Example 1 or Example 4, in this embodiment, a limiting ring is provided on the side of the second diverting pulley 206 away from the load-bearing beam 103 of the test frame.

[0032] During actual use, a limiting ring is provided on the side of the second steering pulley 206 of the present invention away from the load-bearing beam 103 of the test frame. When the impact test is performed, the impact hammer falls and the first magnetic block rises to the limiting ring and stops, which can prevent the impact hammer from causing secondary damage to the sample after falling and completing the impact, and at the same time avoids the first magnetic block from flying out. Example 6

[0033] Preferably, on the basis of Example 1 or Example 5, in this embodiment, the impact hammer 202 is provided with an impact hammer fixing bolt 203, the impact hammer 202 is fixedly connected to the impact hammer lifting cable 204 through the impact hammer fixing bolt 203, the impact ball 201 is a hard steel ball with a diameter ranging from 63mm to 63.5mm, and the impact hammer 202 is a steel cube with a mass ranging from 4kg to 20kg.

[0034] During actual use, the impact hammer 202 of the present invention is provided with an impact hammer fixing bolt 203, and the impact hammer 202 is fixedly connected to the impact hammer lifting cable 204 through the impact hammer fixing bolt 203. The use of the impact hammer fixing bolt for connection facilitates connection and disassembly. Example 7

[0035] Preferably, on the basis of Example 1 or Example 6, in this embodiment, a fastening bolt 210 is provided on the height adjuster 209 , and the height adjuster 209 is fixedly connected to the load-bearing beam 103 of the test frame through the fastening bolt 210 .

[0036] During actual use, the height adjuster 209 of the present invention is provided with a fastening bolt 210, and the height adjuster 209 is fixedly connected to the test frame load-bearing beam 103 through the fastening bolt 210. The fastening bolt is used to fix the height adjuster 209, which is convenient for connection and disassembly. Example 8

[0037] Preferably, on the basis of Example 1 or Example 7, in this embodiment, a magnetic base 302 is provided at the bottom of the sample crushing limit sensor 303, and a plurality of magnetic tracks 301 are distributed on the inner wall of the test shield 102 of the test area at equal distances according to the sample height, and the magnetic base 302 is slidably connected to the magnetic track 301.

[0038] In actual use, the sample crushing limit sensor 303 of the present invention is provided with a magnetic base 302 at the bottom, and a plurality of magnetic tracks 301 are distributed at equal distances on the inner wall of the test shield 102 of the test area according to the sample height, and the magnetic base 302 is slidably connected to the magnetic track 301. The installation is quick and convenient and the adjustment is easy. Example 9

[0039] Preferably, on the basis of Example 1 or Example 8, in this embodiment, two impact ball positioning supports 215 are symmetrically provided on the inner side of the test shield 102, and a spring is provided on the side of the impact ball positioning support 215 close to the inner wall of the test shield 102. The side of the impact ball positioning support 215 close to the impact ball 201 is arc-shaped, and the two impact ball positioning supports 215 support and fix the impact ball 201.

[0040] During actual use, two impact ball positioning supports 215 are symmetrically provided on the inner side of the test shield 102 of the present invention. A spring is provided on the impact ball positioning support 215 close to the inner wall of the test shield 102. The impact ball positioning support 215 is arc-shaped on the side close to the impact ball 201. The impact ball is supported and fixed by the two impact ball positioning supports, thereby achieving accurate fixation of the position of the impact ball. Example 10

[0041] A mortar concrete impact resistance test method, using the mortar concrete impact resistance test device as described above, comprises the following steps: S1: Prepare mortar concrete specimens of specified size and shape according to standard specifications, cure the specimens to the specified age, take them out, place them in the test room where the test device is located, adjust the test room temperature to a standard test environment of 23℃±2℃ and relative humidity of 50%±5%, and adjust for 24h; S2: Place the sample in the test area on the test frame bottom plate 101, center the sample, and then install the test shield 102; S3: Install the sample crushing limit sensor 303 on the inner wall of the test shield 102 according to the size of the sample, and place the impact ball 201 in the middle of the top surface of the sample; S4: adjusting the position of the height adjuster 209 on the test frame load-bearing beam 103 according to the impact test height; S5: Start the impact adjustment mechanism and start the impact test. The specific process of a single impact test cycle is as follows: First, the descending motor 214 is started, and the second magnetic block 208 and the first magnetic block 207 are driven to descend through the second magnetic block descending rope 212, and the impact hammer 202 is raised; when the second magnetic block 208 descends to the point where the magnetic conversion valve contacts the height adjuster 209, the second magnetic block 208 completes the magnetic conversion, and the second magnetic block 208 and the first magnetic block 207 change from attraction to repulsion, and the first magnetic block 207, the impact hammer lifting rope 204, and the impact hammer 202 change from a restrained state to a relaxed state, and the impact hammer 202 falls to impact the impact ball 201, completing an impact test on the sample. After the impact is over, the descending motor 214 stops working, and the ascending motor 211 starts, and the second magnetic block 208 is driven to rise through the second magnetic block ascending rope 212. When it rises to the point where the magnetic conversion valve of the second magnetic block 208 is separated from the height adjuster 209, the magnetic properties of the second magnetic block 208 are again converted to a state of attraction with the first magnetic block 207. When the second magnetic block 208 continues to rise with the second magnetic block ascending rope 212 until it contacts and adsorbs with the first magnetic block 207, the ascending motor 211 stops working, and then the descending motor 214 continues to start, and the next impact test cycle is carried out; S6: During the entire impact test cycle, the sample crushing limit sensor 303 and the high-speed camera 304 are kept working by the controller 305. The sample crushing limit sensor 303 is used to monitor whether the dimensional change during the impact test reaches the specification requirement value, and the high-speed camera 304 is used to observe the crack expansion and crushing conditions on the surface of the specimen in each impact test cycle. When the high-speed camera 304 observes the first crack on the surface of the specimen, the controller 305 records the impact number at this time as the initial crack impact number; when the sample crushing limit sensors 303 on three surfaces alarm at the same time or the high-speed camera 304 observes the sample cracking, it indicates that the specimen has been destroyed, and the test is ended. The controller 305 records the impact number at this time as the destruction impact number; S7: The number of impact test cycles of the sample is recorded through the controller 305, and the impact energy consumption of the mortar concrete against initial cracking and the impact energy consumption against destruction are calculated according to the requirements of the specification.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A mortar concrete impact resistance test device, characterized in that: It includes a test stand, an impact module and a measurement control module, wherein: The test frame comprises a test frame bottom plate (101), a test area is provided on the top surface above the test frame bottom plate (101), a test shield (102) is fixedly provided on the outside of the test area, a test frame load-bearing beam (103) is provided on the outside of the test shield (102) near the middle of the test frame bottom plate (101), and a test frame top plate (104) is provided on the top of the test frame load-bearing beam (103); The impact module comprises an impact ball (201), an impact hammer (202), an impact hammer lifting cable (204), a height adjuster (209) and an impact adjustment mechanism; the impact ball (201) is fixed to the upper surface of the mortar concrete to be tested; an impact hammer (202) is arranged directly above the impact ball (201); the impact hammer (202) is connected to the impact hammer lifting cable (204); the height adjuster (209) is fixedly mounted on the load-bearing beam (103) of the test frame; and the impact adjustment mechanism is used to drive the impact hammer lifting cable (204) to move up and down to achieve the impact of the impact hammer (202) on the impact ball (201); The measurement control module comprises a plurality of sample breakage limit sensors (303), a high-speed camera (304) and a controller (305); the sample breakage limit sensors (303) are mounted on the inner wall of the test shield (102); the high-speed camera (304) is mounted on the lower surface of the test frame top plate (104) above the test area; the sample breakage limit sensors (303) and the high-speed camera (304) are respectively electrically connected to the controller (305).

2. A mortar concrete impact resistance testing device according to claim 1, characterized in that: Two laser-etched scales are provided in the test area above the test frame bottom plate (101); the two scales intersect at the center of the test area and are perpendicular to each other; test frame feet (105) are provided around the bottom of the test frame bottom plate (101); the test frame feet (105) are made of laminated stainless steel and rubber.

3. A mortar concrete impact resistance testing device according to claim 1, characterized in that: The height range of the test frame load-bearing beam (103) is 2500 mm to 3000 mm, and a laser-etched scale is provided on the test frame load-bearing beam (103).

4. The mortar concrete impact resistance testing device according to claim 1, characterized in that: The impact adjustment mechanism comprises a first steering pulley (205), a second steering pulley (206), a first magnetic block (207), a second magnetic block (208), an ascending motor (211) and a descending motor (214); the first steering pulley (205) is mounted on the lower surface of the test frame top plate (104) and is located directly above the impact ball (201); the second steering pulley (206) is mounted on the test frame load-bearing beam (103); the ascending motor (211) is mounted on the lower surface of the test frame top plate (104) and is located directly above the second steering pulley (206); the descending motor (214) is mounted on the upper surface of the test frame bottom plate (101) and is located directly below the second steering pulley (206); one end of the impact hammer lifting cable (204) is fixedly connected to the impact hammer (202), and the other end passes through the first steering pulley (205) in sequence. The second deflection pulley (206) is connected to the first magnetic block (207); a second magnetic block (208) is magnetically connected below the first magnetic block (207); second magnetic block ascending ropes (212) are provided on both sides of the second magnetic block (208); the second magnetic block ascending ropes (212) are connected to an ascending motor (211); a second magnetic block descending rope (213) is provided on the lower surface of the second magnetic block (208); the second magnetic block descending rope (213) is connected to a descending motor (214); a magnetic conversion valve is also provided on the second magnetic block (208); when the magnetic conversion valve contacts a wrench on the height adjuster (209), the second magnetic block (208) and the first magnetic block (207) change from attraction to repulsion; the ascending motor (211) and the descending motor (214) are respectively electrically connected to a controller (305).

5. A mortar concrete impact resistance testing device according to claim 4, characterized in that: A limiting ring is provided on the side of the second diverting pulley (206) away from the test frame load-bearing beam (103).

6. The mortar concrete impact resistance testing device according to claim 1, characterized in that: The impact hammer (202) is provided with an impact hammer fixing bolt (203), and the impact hammer (202) is fixedly connected to the impact hammer lifting cable (204) via the impact hammer fixing bolt (203). The impact ball (201) is a hard steel ball with a diameter ranging from 63 mm to 63.5 mm. The impact hammer (202) is a steel cube with a mass ranging from 4 kg to 20 kg.

7. The mortar concrete impact resistance testing device according to claim 1, characterized in that: The height adjuster (209) is provided with a fastening bolt (210), and the height adjuster (209) is fixedly connected to the test frame load-bearing beam (103) via the fastening bolt (210).

8. The mortar concrete impact resistance testing device according to claim 1, characterized in that: A magnetic base (302) is provided at the bottom of the sample crushing limit sensor (303), and a plurality of magnetic tracks (301) are distributed at equal distances on the inner side wall of the test shield (102) of the test area according to the sample height, and the magnetic base (302) is slidably connected to the magnetic track (301).

9. The mortar concrete impact resistance testing device according to claim 1, characterized in that: Two impact ball positioning supports (215) are symmetrically arranged on the inner side of the test shield (102); a spring is arranged on the side of the impact ball positioning support (215) close to the inner wall of the test shield (102); a side of the impact ball positioning support (215) close to the impact ball (201) is in an arc shape; the two impact ball positioning supports (215) support and fix the impact ball (201).

10. A mortar concrete impact resistance test method, using a mortar concrete impact resistance test device as claimed in claim 1, characterized in that: The following steps are involved: S1: Prepare mortar concrete specimens of specified size and shape according to standard specifications, cure the specimens to the specified age, take them out, place them in the test room where the test device is located, adjust the test room temperature to a standard test environment of 23℃±2℃ and relative humidity of 50%±5%, and adjust for 24h; S2: Place the sample in the test area on the test frame bottom plate (101), center the sample, and then install the test cover (102); S3: Install the sample crushing limit sensor (303) on the inner wall of the test shield (102) according to the size of the sample, and place the impact ball (201) in the middle of the top surface of the sample; S4: adjusting the position of the height adjuster (209) on the test frame load-bearing beam (103) according to the impact test height; S5: Start the impact adjustment mechanism and start the impact test. The specific process of a single impact test cycle is as follows: First, the descending motor (214) is started, and the second magnetic block (208) and the first magnetic block (207) are driven to descend through the second magnetic block descending rope (212), and the impact hammer (202) is raised; when the second magnetic block (208) descends until the magnetic conversion valve contacts the height adjuster (209), the second magnetic block (208) completes the magnetic conversion, and the second magnetic block (208) and the first magnetic block (207) change from attraction to repulsion, and the first magnetic block (207), the impact hammer lifting rope (204), and the impact hammer (202) change from a restrained state to a relaxed state, and the impact hammer (202) falls to impact the impact ball (201), completing an impact on the sample. Test; after the impact is over, the descending motor (214) stops working, the ascending motor (211) starts, and the second magnetic block (208) is driven to rise through the second magnetic block ascending rope (212). When the second magnetic block (208) rises to the point where the magnetic conversion valve is separated from the height adjuster (209), the magnetism of the second magnetic block (208) is again converted to a state of attraction with the first magnetic block (207). The second magnetic block (208) continues to rise along the second magnetic block ascending rope (212) until it contacts and adsorbs the first magnetic block (207). The ascending motor (211) stops working, and then the descending motor (214) continues to start, and the next impact test cycle is performed; S6: During the entire impact test cycle, the sample crushing limit sensor (303) and the high-speed camera (304) are continuously operated through the controller (305). The sample crushing limit sensor (303) is used to monitor whether the dimensional change during the impact test reaches the value required by the specification. The high-speed camera (304) is used to observe the crack expansion and crushing conditions on the surface of the sample in each impact test cycle. When the high-speed camera (304) observes the first crack on the surface of the sample, the controller (305) records the impact number at this time as the initial crack impact number; when the sample crushing limit sensors (303) on three surfaces alarm at the same time or the high-speed camera (304) observes the sample cracking, it indicates that the sample has been destroyed, and the test ends. The controller (305) records the impact number at this time as the destruction impact number; S7: The number of impact test cycles of the sample is recorded through the controller (305), and the impact energy dissipation against initial cracking and the impact energy dissipation against destruction of the mortar concrete are calculated according to the requirements of the specification.

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