A device for detecting the hardness of building materials

Abstract

The present invention discloses a hardness detection device for building materials, which relates to the technical field of hardness detection, and includes: the processing table, on the surface of the processing table, a support frame is fixedly installed, on the top of the processing table, a slide rail is fixedly installed, and a placement table is slidably installed on the inner wall of the slide rail; a support device, the support device is arranged on the top of the processing table, and the support device includes a hardness detector, a support base, an electric telescopic rod, a clamping plate, a sliding rod and a clamping plate. By moving the output end of the electric telescopic rod towards the middle of the processing table to drive the clamping plate to move towards the middle of the processing table, the clamping plate moving towards the middle of the processing table will support the building materials. The hardness detector is fixedly installed on the top of the inner wall of the support frame, and the support base is fixedly installed on the top of the processing table, preventing the building materials from shifting due to excessive impact when the hardness detector detects the building materials, which affects the subsequent detection effect.

Description

Technical Field

[0001] The present invention relates to the technical field of hardness detection, and particularly to a hardness detection device for building materials. Background Art

[0002] Building materials refer to various raw materials, products and components used in construction and structural engineering, which are used to build various parts and structures of buildings. Building materials can be natural materials or artificial materials that have been processed and manufactured. Before the materials are used in construction, their hardness often needs to be detected, and they can only be used in construction after meeting the strength requirements.

[0003] The patent with the patent announcement number CN220063621U relates to a hardness detection device for building materials, including a support base and a detection probe installed on the surface of the connecting plate of the support base. An adjustment component is installed on the support base. The adjustment component includes a fixed block, a threaded rod, a block body, a panel, a bracket, an adjustment screw, an extrusion plate, a fixing plate, a T-shaped rod, an insertion block and a spring. The left and right sides of the upper surface of the support base are both slidably connected with the fixed block through the opened chutes. By setting the adjustment component, the test piece can be adjusted left, right, front and back to achieve multi-directional detection, thereby improving work efficiency and reducing the labor intensity of the staff. And a support component is added to this mechanism, which can stably support the moving fixed block, making the fixing plate more evenly stressed and improving the accuracy of detection.

[0004] In the above patent, by setting the adjustment component, the test piece can be adjusted left, right, front and back to achieve multi-directional detection, thereby improving work efficiency and reducing the labor intensity of the staff. And a support component is added to this mechanism, which can stably support the moving fixed block, making the fixing plate more evenly stressed and improving the accuracy of detection. However, during support, the material plate may be lifted upwards due to impact, resulting in inaccurate detection structure and affecting the accuracy of data. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a hardness detection device for building materials, which solves the problems raised in the above background art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A hardness detection device for building materials, comprising: the processing table, on the surface of the processing table, a support frame is fixedly installed, on the top of the processing table, a slide rail is fixedly installed, and a placement table is slidably installed on the inner wall of the slide rail; a support device, the support device is arranged on the top of the processing table, the support device includes a hardness detector, a support base, an electric telescopic rod, a clamping plate, a slide rod and a clamping block. By moving the output end of the electric telescopic rod towards the middle of the processing table, the clamping plate is driven to move towards the middle of the processing table. When the clamping plate moves towards the middle of the processing table, it will support the building materials. The hardness detector is fixedly installed on the top of the inner wall of the support frame, the support base is fixedly installed on the top of the processing table, the electric telescopic rod is fixedly installed on the surface of the support base, the clamping plate is fixedly installed at the output end of the electric telescopic rod, the slide rod slidably penetrates the surface of the clamping plate, and the clamping block is fixedly installed on the surface of the slide rod.

[0007] According to the above technical solution, a connecting seat is fixedly installed on the top of the clamping plate, an L-shaped rod is rotatably installed on the inner wall of the connecting seat, a limiting plate is fixedly installed on the surface of the L-shaped rod, and a second torsion spring is arranged between the connecting seat and the L-shaped rod. When the slide rod moves towards the clamping plate, it will contact the L-shaped rod. The slide rod will push the L-shaped rod to rotate upwards, and the upward rotation of the L-shaped rod will drive the limiting plate to rotate downwards, and the L-shaped rod is driven to reset by the second torsion spring.

[0008] According to the above technical solution, a first spring is arranged between the slide rail and the placement table, and the placement table is driven to reset by the first spring. A second spring is arranged between the slide rod and the clamping plate, and the slide rod is driven to reset by the second spring.

[0009] According to the above technical solution, a protection device and a cleaning device are further included. The protection device includes a fixed rod, a guide rod, a connecting rope and a connecting column. By moving the clamping plate towards the middle of the processing table, the connecting rope is pulled towards the middle of the processing table. The movement of the connecting rope towards the middle of the processing table is guided by the fixed rod and the guide rod. The movement of the connecting rope towards the middle of the processing table will drive the connecting column to move towards the bottom of the hardness detector. The fixed rod is fixedly installed on the top of the processing table, the guide rod is fixedly installed on the top of the processing table, the connecting column is fixedly installed on the bottom of the placement table, one end of the connecting rope is fixedly installed on the surface of the clamping plate, and the other end of the connecting rope is fixedly installed on the surface of the connecting column.

[0010] According to the above technical solution, an elastic telescopic rod is fixedly installed on the surface of the clamping plate. A connecting rod is fixedly installed at the bottom of the elastic telescopic rod. A sliding groove is formed in the inner wall of the processing table. An L-shaped plate is slidably installed on the inner wall of the sliding groove. An elastic telescopic block is fixedly installed on the surface of the L-shaped plate. A clamping block is fixedly installed at the bottom of the placing table. A limiting block is fixedly installed on the top of the processing table. During the movement of the clamping block, it will contact the free end of the elastic telescopic block, and the clamping block will push the free end of the elastic telescopic block downward. When the clamping block is separated from the free end of the elastic telescopic block, the free end of the elastic telescopic block will reset and get stuck between the clamping blocks.

[0011] According to the above technical solution, the connecting rope contacts the surface of the fixed rod, the connecting rope contacts the surface of the guide rod. An inclined groove is formed in the surface of the L-shaped plate. A third spring is arranged between the sliding groove and the L-shaped plate. The third spring drives the L-shaped plate to reset.

[0012] According to the above technical solution, the cleaning device includes a mounting seat, a cleaning roller, a winding wheel, a pulling rope and a guiding seat. When the connecting column moves towards the bottom of the hardness detector, it will pull the pulling rope. When the pulling rope is pulled, it will drive the winding wheel to rotate. When the winding wheel rotates, it will drive the cleaning roller to rotate. The mounting seat is fixedly installed on the top of the processing table. The cleaning roller is rotatably installed on the surface of the mounting seat. The winding wheel is fixedly installed on the circumferential surface of the cleaning roller. One end of the pulling rope is fixedly installed on the surface of the winding wheel. The other end of the pulling rope is fixedly installed on the surface of the connecting column. The guiding seat is fixedly installed on the top of the processing table.

[0013] According to the above technical solution, a pulley frame is fixedly installed on the surface of the connecting column. An air pressure box is fixedly installed on the surface of the support frame. An air pressure plate is slidably installed in the inner wall of the air pressure box. A sliding rod is fixedly installed at the bottom of the air pressure plate. A triangular plate is fixedly installed at the bottom of the sliding rod. When the connecting column moves towards the bottom of the hardness detector, it will drive the pulley frame to move towards the air pressure box. When the pulley frame moves towards the air pressure box, it will contact the triangular plate. The pulley frame will push the triangular plate upward. When the triangular plate moves upward, it will drive the sliding rod downward. When the sliding rod moves upward, it will drive the air pressure plate upward.

[0014] According to the above technical solution, a first torsion spring is arranged between the cleaning roller and the mounting seat. The first torsion spring drives the cleaning roller to reset. The pulling rope is wound around the surface of the winding wheel. A fourth spring is arranged between the air pressure box and the air pressure plate. The fourth spring drives the air pressure plate to reset.

[0015] The present invention provides a hardness detection device for building materials, having the following beneficial effects:

[0016] (1) In this invention, when the clamping plate moves towards the middle of the processing table, it will support the building material, preventing the building material from shifting due to excessive impact during the detection by the hardness detector, which may affect the subsequent detection effect. At the same time, through the sliding rod and the first spring, it is prevented that when the clamping plate holds the building material, continuous clamping may cause the building material to deform, affecting the hardness detection effect. The limiting plate rotates downward to limit the building material, preventing the edge of the building material from tilting due to impact during detection, resulting in non-standard detection data and affecting the detection effect.

[0017] (2) In this invention, when the connecting column moves towards the bottom of the hardness detector, it will drive the placement table to move towards the bottom of the hardness detector. By moving the placement table towards the bottom of the hardness detector, it can prevent workers from being injured if the hardness detector suddenly starts when placing the building material, which poses a safety hazard. At the same time, by limiting the block, the placement table stops moving, preventing the placement table from moving when the hardness detector impacts, and preventing inaccurate detection results, which may affect the accuracy of the detection.

[0018] (3) In this invention, the cleaning roller rotates to clean the impurities on the building material, preventing the hardness detector from not fully contacting the material surface or forming a gap between the impurities and the material surface when there are impurities such as particles, dust or other foreign objects on the surface of the building material, thus affecting the accuracy of the hardness test. At the same time, when the air pressure plate moves upward, it will squeeze the gas inside the air pressure box to eject, and the ejected gas will blow away the impurities on the building material, preventing the impurities from affecting the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a schematic diagram of the overall sectional structure of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of the support device of the present invention;

[0022] Figure 4 is a schematic diagram of the sectional structure of the processing table of the present invention;

[0023] Figure 5 is a schematic diagram of the bottom structure of the placement table of the present invention;

[0024] Figure 6 is of the present invention Figure 5 is an enlarged schematic diagram of the structure of part A in;

[0025] Figure 7 is a schematic diagram of the sectional structure of the air pressure box of the present invention.

[0026] In the figure: 1, processing table; 2, support frame; 3, slide rail; 4, placement table; 5, hardness detector; 6, support base; 7, electric telescopic rod; 8, clamping plate; 9, slide bar; 10, clamping plate; 11, connection seat; 12, L-shaped rod; 13, limiting plate; 141, fixing rod; 142, guiding rod; 143, connecting rope; 144, connecting column; 145, elastic telescopic rod; 146, connecting rod; 147, L-shaped plate; 148, elastic telescopic block; 149, clamping block; 1410, limiting block; 151, mounting seat; 152, cleaning roller; 153, winding wheel; 154, pulling rope; 155, guiding seat; 156, pulley frame; 157, air pressure box; 158, air pressure plate; 159, sliding rod; 1510, triangular plate. Detailed implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1 - 3 , an embodiment of the present invention is: a hardness detection device for building materials, including: a processing table 1, a support frame 2 is fixedly installed on the surface of the processing table 1, a slide rail 3 is fixedly installed on the top of the processing table 1, and a placement table 4 is slidably installed on the inner wall of the slide rail 3; a support device, the support device is arranged on the top of the processing table 1, and the support device includes a hardness detector 5, a support base 6, an electric telescopic rod 7, a clamping plate 8, a slide bar 9 and a clamping plate 10. When the hardness detector 5 detects the building materials, excessive impact may cause the building materials to shift, affecting the subsequent detection effect. The hardness detector 5 is fixedly installed on the top of the inner wall of the support frame 2, the support base 6 is fixedly installed on the top of the processing table 1, the electric telescopic rod 7 is fixedly installed on the surface of the support base 6, the clamping plate 8 is fixedly installed at the output end of the electric telescopic rod 7, the slide bar 9 slidably penetrates the surface of the clamping plate 8, and the clamping plate 10 is fixedly installed on the surface of the slide bar 9.

[0029] A connection seat 11 is fixedly installed on the top of the clamping plate 8, an L-shaped rod 12 is rotatably installed in the inner wall of the connection seat 11, a limiting plate 13 is fixedly installed on the surface of the L-shaped rod 12, and a second torsion spring is arranged between the connection seat 11 and the L-shaped rod 12. The building materials are limited by the downward rotation of the limiting plate 13, preventing the edges of the building materials from warping due to impact during detection, resulting in inaccurate detection data and affecting the detection effect. The L-shaped rod 12 is driven to reset by the second torsion spring.

[0030] A first spring is provided between the sliding rail 3 and the placement table 4, and the placement table 4 is driven to reset by the first spring. A second spring is provided between the sliding rod 9 and the clamping plate 8, and the sliding rod 9 is driven to reset by the second spring.

[0031] When this embodiment works, the output end of the electric telescopic rod 7 moves towards the middle of the processing table 1 to drive the clamping plate 8 to move towards the middle of the processing table 1. When the clamping plate 8 moves towards the middle of the processing table 1, it will support the building material, preventing the building material from shifting due to excessive impact when the hardness detector 5 detects the building material, which affects the subsequent detection effect. At the same time, when the clamping plate 8 moves towards the middle of the processing table 1, it will drive the sliding rod 9 to move towards the middle of the processing table 1. When the sliding rod 9 moves towards the middle of the processing table 1, it will drive the clamping plate 10 to move towards the middle of the processing table 1. When the clamping plate 10 moves towards the middle of the processing table 1, it will contact the building material. Through the sliding rod 9 and the first spring, it is prevented that when the clamping plate 10 clamps the building material, continuous clamping causes the building material to deform, affecting the hardness detection effect. At the same time, when the clamping plate 10 contacts the building material, due to the reaction force of the building material in the opposite direction, the clamping plate 10 will drive the sliding rod 9 to move towards the direction close to the clamping plate 8. When the sliding rod 9 moves towards the direction close to the clamping plate 8, it will contact the L-shaped rod 12. The sliding rod 9 will push the L-shaped rod 12 to rotate upward. When the L-shaped rod 12 rotates upward, it will drive the limiting plate 13 to rotate downward. The building material is limited by the downward rotation of the limiting plate 13, preventing the edge of the building material from tilting up due to impact during detection, resulting in inaccurate detection data and affecting the detection effect.

[0032] Please refer to Figures 1 - 7 , on the basis of the above embodiment, in another embodiment of the present invention, it further includes a protection device and a cleaning device. The protection device includes a fixed rod 141, a guide rod 142, a connecting rope 143 and a connecting column 144. The fixed rod 141 is fixedly installed on the top of the processing table 1, the guide rod 142 is fixedly installed on the top of the processing table 1, the connecting column 144 is fixedly installed on the bottom of the placement table 4, one end of the connecting rope 143 is fixedly installed on the surface of the clamping plate 8, and the other end of the connecting rope 143 is fixedly installed on the surface of the connecting column 144. By moving the placement table 4 towards the bottom of the hardness detector 5, it can prevent workers from being injured when placing building materials due to the sudden start of the hardness detector 5, which poses a safety hazard.

[0033] An elastic telescopic rod 145 is fixedly installed on the surface of the clamping plate 8. The bottom of the elastic telescopic rod 145 is fixedly installed with a connecting rod 146. A chute is opened on the inner wall of the processing table 1. An L-shaped plate 147 is slidably installed on the inner wall of the chute. An elastic telescopic block 148 is fixedly installed on the surface of the L-shaped plate 147. A clamping block 149 is fixedly installed on the bottom of the placement table 4. A limiting block 1410 is fixedly installed on the top of the processing table 1. By limiting the clamping block 149, the placement table 4 is stopped from moving, preventing the placement table 4 from moving when the hardness detector 5 impacts, and preventing the detection result from being inaccurate and affecting the accuracy of the detection.

[0034] The connecting rope 143 is in contact with the surface of the fixed rod 141, the connecting rope 143 is in contact with the surface of the guide rod 142, an inclined groove is formed on the surface of the L-shaped plate 147, and a third spring is arranged between the sliding groove and the L-shaped plate 147 to drive the L-shaped plate 147 to reset through the third spring.

[0035] The cleaning device includes a mounting seat 151, a cleaning roller 152, a winding wheel 153, a pulling rope 154 and a guide seat 155. The mounting seat 151 is fixedly installed on the top of the processing table 1, the cleaning roller 152 is rotatably installed on the surface of the mounting seat 151, the winding wheel 153 is fixedly installed on the circumferential surface of the cleaning roller 152, one end of the pulling rope 154 is fixedly installed on the surface of the winding wheel 153, and the other end of the pulling rope 154 is fixedly installed on the surface of the connecting column 144. The guide seat 155 is fixedly installed on the top of the processing table 1 to prevent impurities such as particles, dust or other foreign objects on the surface of the building material from causing the hardness detector 5 to not fully contact the material surface, or creating a gap between the impurity and the material surface, thereby affecting the accuracy of the hardness test.

[0036] A pulley frame 156 is fixedly installed on the surface of the connecting column 144, a pneumatic box 157 is fixedly installed on the surface of the support frame 2, a pneumatic plate 158 is slidably installed on the inner wall of the pneumatic box 157, a sliding rod 159 is fixedly installed at the bottom of the pneumatic plate 158, and a triangular plate 1510 is fixedly installed at the bottom of the sliding rod 159. When the pneumatic plate 158 moves upward, it will squeeze the gas inside the pneumatic box 157 to eject, and the impurities on the building material will be blown away by the ejected gas to prevent the impurities from affecting the detection accuracy.

[0037] A first torsion spring is arranged between the cleaning roller 152 and the mounting seat 151 to drive the cleaning roller 152 to reset through the first torsion spring. The pulling rope 154 is wound around the surface of the winding wheel 153. A fourth spring is arranged between the pneumatic box 157 and the pneumatic plate 158 to drive the pneumatic plate 158 to reset through the fourth spring.

[0038] During the operation of this embodiment, the clamping plate 8 moves towards the middle of the processing table 1, pulling the connecting rope 143 to move towards the middle of the processing table 1. The movement of the connecting rope 143 towards the middle of the processing table 1 is guided by the fixed rod 141 and the guiding rod 142. The movement of the connecting rope 143 towards the middle of the processing table 1 will drive the connecting column 144 to move towards the bottom of the hardness detector 5. The movement of the connecting column 144 towards the bottom of the hardness detector 5 will drive the placing table 4 to move towards the bottom of the hardness detector 5. By moving the placing table 4 towards the bottom of the hardness detector 5, it can prevent workers from being injured when the hardness detector 5 suddenly starts when placing building materials, which poses a safety hazard. At the same time, the movement of the clamping plate 8 towards the middle of the processing table 1 will drive the elastic telescopic rod 145 to move towards the middle of the processing table 1. The movement of the elastic telescopic rod 145 towards the middle of the processing table 1 will drive the connecting rod 146 to move towards the middle of the processing table 1. The movement of the connecting rod 146 towards the middle of the processing table 1 will contact the inclined groove. The movement of the connecting rod 146 towards the middle of the processing table 1 will push the L-shaped plate 147 to move upwards. The upward movement of the L-shaped plate 147 will drive the elastic telescopic block 148 to move upwards. While the elastic telescopic block 148 moves upwards, the placing table 4 will drive the clamping block 149 to move towards the direction of the limiting block 1410. During the movement of the clamping block 149, it will contact the free end of the elastic telescopic block 148. The clamping block 149 will push the free end of the elastic telescopic block 148 to move downwards. When the clamping block 149 disengages from the free end of the elastic telescopic block 148, the free end of the elastic telescopic block 148 will reset and snap into between the clamping blocks 149. By limiting the clamping block 149, the placing table 4 is stopped from moving, preventing the placing table 4 from moving when the hardness detector 5 impacts, and preventing the test results from being inaccurate and affecting the accuracy of the detection.

[0039] The movement of the connecting column 144 towards the bottom of the hardness detector 5 will pull the pull rope 154. When the pull rope 154 is pulled, it will drive the winding wheel 153 to rotate. The rotation of the winding wheel 153 will drive the cleaning roller 152 to rotate. By rotating the cleaning roller 152, the impurities on the building materials are cleaned. When there are impurities such as particles, dust or other foreign objects on the surface of the building materials, it can prevent the hardness detector 5 from not fully contacting the material surface, or preventing voids from being formed between the impurities and the material surface, thus affecting the accuracy of the hardness test. At the same time, the movement of the connecting column 144 towards the bottom of the hardness detector 5 will drive the pulley frame 156 to move towards the direction of the air pressure box 157. The movement of the pulley frame 156 towards the direction of the air pressure box 157 will contact the triangular plate 1510. The pulley frame 156 will push the triangular plate 1510 to move upwards. The upward movement of the triangular plate 1510 will drive the sliding rod 159 to move downwards. The upward movement of the sliding rod 159 will drive the air pressure plate 158 to move upwards. The upward movement of the air pressure plate 158 will squeeze the gas inside the air pressure box 157 to spray out. The impurities on the building materials are blown away by the sprayed gas, preventing the impurities from affecting the accuracy of the detection.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hardness detection device for building materials, characterized in that, Including: The processing table (1), on the surface of the processing table (1), a support frame (2) is fixedly installed, on the top of the processing table (1), a slide rail (3) is fixedly installed, and a placement table (4) is slidably installed on the inner wall of the slide rail (3); A support device, the support device is arranged on the top of the processing table (1), the support device includes a hardness detector (5), a support seat (6), an electric telescopic rod (7), a clamping plate (8), a slide rod (9) and a clamping plate (10), the hardness detector (5) is fixedly installed on the top inner wall of the support frame (2), the support seat (6) is fixedly installed on the top of the processing table (1), the electric telescopic rod (7) is fixedly installed on the surface of the support seat (6), the clamping plate (8) is fixedly installed at the output end of the electric telescopic rod (7), the slide rod (9) slidably penetrates the surface of the clamping plate (8), and the clamping plate (10) is fixedly installed on the surface of the slide rod (9); Among them, a protection device for protecting the safety of workers is arranged on the processing table (1), and a cleaning device is arranged on the protection device; A first spring is arranged between the slide rail (3) and the placement table (4), and a second spring is arranged between the slide rod (9) and the clamping plate (8); The protection device includes a fixed rod (141), a guide rod (142), a connecting rope (143) and a connecting column (144), the fixed rod (141) is fixedly installed on the top of the processing table (1), the guide rod (142) is fixedly installed on the top of the processing table (1), the connecting column (144) is fixedly installed at the bottom of the placement table (4), one end of the connecting rope (143) is fixedly installed on the surface of the clamping plate (8), and the other end of the connecting rope (143) is fixedly installed on the surface of the connecting column (144); An elastic telescopic rod (145) is fixedly installed on the surface of the clamping plate (8), a connecting rod (146) is fixedly installed at the bottom of the elastic telescopic rod (145), a chute is opened on the inner wall of the processing table (1), an L-shaped plate (147) is slidably installed on the inner wall of the chute, an elastic telescopic block (148) is fixedly installed on the surface of the L-shaped plate (147), a clamping block (149) is fixedly installed at the bottom of the placement table (4), and a limiting block (1410) is fixedly installed on the top of the processing table (1); The connecting rope (143) is in contact with the surface of the fixed rod (141), the connecting rope (143) is in contact with the surface of the guide rod (142), an inclined groove is opened on the surface of the L-shaped plate (147), and a third spring is arranged between the chute and the L-shaped plate (147).

2. The hardness detection device for building materials according to claim 1, wherein: The cleaning device includes a mounting base (151), a cleaning roller (152), a winding wheel (153), a pulling rope (154), and a guiding base (155). The mounting base (151) is fixedly installed on the top of the processing table (1). The cleaning roller (152) is rotatably installed on the surface of the mounting base (151). The winding wheel (153) is fixedly installed on the circumferential surface of the cleaning roller (152). One end of the pulling rope (154) is fixedly installed on the surface of the winding wheel (153), and the other end of the pulling rope (154) is fixedly installed on the surface of the connecting column (144). The guiding base (155) is fixedly installed on the top of the processing table (1).

3. The hardness detection device for a building material according to claim 2, wherein: A pulley bracket (156) is fixedly installed on the surface of the connecting column (144). An air pressure box (157) is fixedly installed on the surface of the support frame (2). An air pressure plate (158) is slidably installed on the inner wall of the air pressure box (157). A sliding rod (159) is fixedly installed at the bottom of the air pressure plate (158), and a triangular plate (1510) is fixedly installed at the bottom of the sliding rod (159).

4. The hardness detection device for a building material according to claim 3, characterized in that: A first torsion spring is provided between the cleaning roller (152) and the mounting base (151). The pulling rope (154) is wound around the surface of the winding wheel (153). A fourth spring is provided between the air pressure box (157) and the air pressure plate (158).

5. The hardness detection device for a building material according to claim 4, wherein: A connecting seat (11) is fixedly installed on the top of the clamping plate (8). An L-shaped rod (12) is rotatably installed on the inner wall of the connecting seat (11). A limiting plate (13) is fixedly installed on the surface of the L-shaped rod (12). A second torsion spring is provided between the connecting seat (11) and the L-shaped rod (12).

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