Stress testing device for prefabricated building prefabricated concrete slab

Abstract

The application discloses a stress testing device for prefabricated concrete slabs of fabricated buildings, which comprises a bearing table, a moving frame arranged at the top side of the bearing table, a rotating screw rod and an auxiliary rod rotatably arranged on the two sides of the bearing table, and a stepping motor arranged on the side of the bearing table. The stress testing device for prefabricated concrete slabs of fabricated buildings is used for rubbing and resisting the concrete stone residues adhered to the surface of the concrete slab during the movement of the moving frame and the reciprocating movement of the cleaning plate, so that the residues are separated from the surface of the concrete slab. Then, the separated concrete stone residues are scooped up by the arc-shaped scooping plate and fall into the collecting grooves on the two sides along the guiding track of the arc-shaped scooping plate, so that the impurities on the surface of the concrete slab can be automatically cleaned and collected during the detection, and the stress testing mechanism can be fully contacted with the concrete slab during the detection, so that the accuracy of the measurement result is ensured.

Description

Technical Field

[0001] This invention relates to the field of precast concrete slab stress testing technology, specifically a stress testing device for precast concrete slabs in assembled buildings. Background Technology

[0002] Precast concrete refers to concrete products manufactured in a factory or on-site (not at the final design location). Precast concrete is poured elsewhere, not at the final construction site. Fiber-reinforced concrete of various sizes and shapes can enhance its reliability and crack resilience. Stress testing of concrete structures refers to the measurement of stress and its changes under load and other factors using monitoring instruments and equipment embedded in the surface and interior of concrete structures. Its purpose is to understand the stress state of the structure, analyze its operational status, assess its safety, provide a scientific basis for safe operation and maintenance reinforcement, and also provide measured data for evaluating construction quality and improving design.

[0003] Existing methods for surface stress testing of concrete slabs require attaching a stress testing device to the surface before performing stress value measurements. Before testing, the concrete slab surface needs to be cleaned to ensure sufficient contact between the device and the slab. However, during the fabrication or placement of the concrete slab, some concrete aggregate residue may adhere to its surface. When the stress testing device is applied to multiple points on the concrete slab surface, it may come into contact with this residue, making it difficult to guarantee sufficient contact. Furthermore, the lack of an automatic cleaning function reduces the accuracy of the test results and limits its practical application. Summary of the Invention

[0004] The purpose of this invention is to provide a stress testing device for precast concrete slabs in prefabricated buildings, in order to solve the problems mentioned in the background art, where concrete slabs may have some concrete aggregate residue adhering to their surface during the production or placement of the concrete slabs. When the stress testing mechanism is applied to the surface of the concrete slab at multiple points, it may adhere to the surface of some of the adhering concrete aggregate residue, making it impossible to ensure sufficient contact between the stress testing mechanism and the concrete slab. The device also lacks an automatic cleaning function, thereby reducing the accuracy of the test results and having certain limitations in practical use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stress testing device for precast concrete slabs in prefabricated buildings, comprising a support platform, a movable frame disposed on one side of the top of the support platform, a rotating lead screw and an auxiliary rod respectively mounted on both sides of the support platform, a stepper motor disposed on one side of the support platform, and the output end of the stepper motor being fixedly installed with the rotating lead screw, the bottom ends of the movable frame respectively penetrating through the outside of one side of the rotating lead screw and the auxiliary rod, a concrete slab body disposed on one side of the top of the support platform, and a cavity pre-formed inside the top of the support platform; a rotating lead screw is also installed inside the top of the movable frame, and a stepper motor is also installed on the outside of one side of the movable frame, with the output end of the stepper motor there connected to one end of the rotating lead screw inside the top of the movable frame. The movable frame is equipped with a slidable locking limit block on one side of its top. A rotating screw inside the top of the movable frame penetrates one side of the limit block, and an electric telescopic rod is installed on the bottom side of the limit block. A stress detection mechanism is installed at the output end of the electric telescopic rod. A cleaning mechanism is located on the outside of one side of the movable frame. The cleaning mechanism removes impurities adhering to the surface of the concrete slab. The cleaning mechanism includes a fixed frame, a cleaning plate, and a scraping plate. The fixed frame is installed on the outside of one side of the movable frame, and the scraping plate is installed on the side of the fixed frame near the concrete slab. The scraping plate is generally arc-shaped, and the cleaning plate is fitted against the bottom side of the scraping plate. The side of the cleaning plate near the top surface of the concrete slab is serrated.

[0006] Preferably, the cleaning mechanism further includes a rotating rod, an auxiliary block, a limiting rotating rod, a positioning rack, a limiting gear, a bevel gear set, a turntable, a positioning column, a limiting frame, an auxiliary slide groove, an extension rod, and a collection groove. The rotating rod is rotatably installed inside the bottom side of the fixed frame at the middle position. The limiting rotating rod is horizontally arranged on the bottom side of the fixed frame. The auxiliary block is rotatably installed outside the limiting rotating rod on one side, and one side of the auxiliary block is fixedly installed on the inner wall of the bottom side of the fixed frame.

[0007] The above technical solution ensures that the limiting rod is more stable during rotation by using the auxiliary block for limiting.

[0008] Preferably, the positioning rack is installed on the outside of one side of the top of the support platform, the limiting gear is fixedly installed on the outside of one side of the limiting rotating rod, and one side of the limiting gear is meshed with one side of the positioning rack. A bevel gear set is installed between one side of the top of the rotating rod and one end of the limiting rotating rod, so that the limiting rotating rod rotates while the fixed frame moves.

[0009] The above technical solution enables the entire unit to move during use, allowing the limit gear to move on the positioning rack via the movement of the fixed frame, thereby causing the rotating rod on one side to rotate and providing power for the subsequent operation of the sweeping mechanism, without the need for external drive components.

[0010] Preferably, the turntable is fixedly installed at the middle position on one side of the outside of the bottom end of the rotating rod, the positioning post is installed at the edge of the bottom end of the turntable, the limiting frame is provided with an auxiliary sliding groove through the inside, and the limiting frame is slidably sleeved on the outside of the positioning post. Extension rods are fixedly provided on both sides of the bottom end of the limiting frame near the moving frame, and both ends of the extension rods are slidably installed through the bottom ends of the fixed frame on both sides. One side of the cleaning plate is fixedly installed with one side of the two extension rods.

[0011] The above-mentioned technical solution enables the turntable to rotate when the rotating rod is in use. With the setting of the limit frame and positioning column, the extension rods on both sides reciprocate, which drives the cleaning plate on one side to reciprocate, thereby rubbing and wiping away the concrete residue on the surface of the concrete slab, making it easy to clean and achieving good overall cleaning effect.

[0012] Preferably, a collection trough is fixedly installed inside one side of the support platform near the two edges of the scooping plate, and the collection trough is inclined as a whole, with the inclined end of the collection trough penetrating and installed outside one side of the support platform.

[0013] The above technical solution enables the entire unit to collect and gather the impurities removed by friction through the scooping plate during use, and then guide the impurities into the collection tank on the side, thereby enabling the entire unit to automatically clean and collect.

[0014] Preferably, the top cavity of the support platform is provided with an air storage mechanism, which includes a support plate, a suction cylinder, a piston rod, an exhaust one-way valve pipe, an air storage cylinder, a contact spring, an inlet one-way valve pipe, a hose reel, and an air blowing pipe. The support plate is attached to the bottom outer surface of the concrete slab body. The suction cylinders are longitudinally fixed at equal intervals on the bottom wall of the cavity of the support platform. A piston rod is installed inside each suction cylinder, and the top of each piston rod is fixedly installed on the bottom outer surface of one side of the support plate.

[0015] The above technical solution allows the concrete slab to be placed on top of the support plate during use. Due to its own weight, the piston rod at the bottom descends, squeezing the gas inside the suction cylinder into the gas storage cylinder for gas storage. This facilitates the later discharge of the gas stored in the gas storage cylinder through the air blowing pipe.

[0016] Preferably, the air storage cylinder is embedded in the internal cavity of one side of the support platform, and an exhaust one-way valve pipe is provided through one side of the bottom end of the suction cylinder, and the output end of the exhaust one-way valve pipe is installed through one side of the air storage cylinder. An air inlet one-way valve pipe is provided through the other side of the bottom end of the suction cylinder.

[0017] The above technical solution enables the piston rod to move more smoothly and orderly during both the intake and exhaust phases by using the intake and exhaust one-way valve pipes.

[0018] Preferably, a contact spring is fixedly installed between the top end of the piston rod and the bottom wall of the cavity inside the support platform, so that the piston rod rebounds and resets after the pressure is lost. The air inlet end of the air blowing pipe is connected and installed inside one side of the air storage cylinder. The hose reel is fixedly installed outside the top end of the support platform, and the air blowing pipe is wound around the outside of the hose reel. The air outlet end of the air blowing pipe is installed outside one side edge of the stress detection mechanism, and the air outlet end of the air blowing pipe faces the bottom end of the stress detection mechanism.

[0019] By adopting the above technical solution, when the whole system is in use, the setting of the anti-collision spring allows the concrete slab body on the bearing plate to be removed after the inspection is completed. At this time, the anti-collision spring rebounds and drives the piston rod to rise at the same time, so that the piston rod draws the external gas back into the interior of the vacuum cylinder, thus facilitating the next anti-collision discharge and storage.

[0020] Preferably, an air blowing control mechanism is provided on one side of the electric telescopic rod. The air blowing control mechanism includes a mounting frame, a stop block, a contact block, a rotating shaft, a pressure sensor one, a solenoid valve, a squeezing rod, a pressure sensor two, a limit spring, an extension block, and a return spring. The solenoid valve is installed inside one side of the air blowing pipe. The mounting frame is longitudinally fixed on the outside of the bottom end of the outer rod of the electric telescopic rod. The stop block is fixed on the outside of the bottom end of the inner rod of the electric telescopic rod near the mounting frame. The end of the stop block near the mounting frame is arc-shaped. A contact block is provided on the side of the mounting frame near the bottom end of the stop block, and the end of the contact block near the stop block is also arc-shaped.

[0021] The above technical solution enables the entire system to function when the inner rod of the electric telescopic rod extends, causing the abutment block on one side to descend. This causes the abutment block to contact one end of the contact block, while the other end of the contact block tilts up and contacts the pressure sensor at the top. This controls the opening of the solenoid valve on one side, allowing the air pipe to begin exhausting and blowing dust.

[0022] Preferably, a rotating shaft is fixedly installed inside the contact block near the middle position. Pressure sensor one is fixedly installed on the top side of the mounting bracket located on the contact block. A compression rod is longitudinally slidably engaged at the bottom edge of the stress detection mechanism. A limit spring is sleeved on the bottom of the compression rod and abuts against it. Pressure sensor two is installed on the outside of the stress detection mechanism near the top of the compression rod. Both pressure sensor one and pressure sensor two are electrically controlled by a solenoid valve. Pressure sensor one controls the opening of the solenoid valve, and pressure sensor two controls the closing of the solenoid valve. Both ends of the rotating shaft are rotatably installed through the outside of the two sides of the mounting bracket. An extension block is fixedly installed at one rotatable end of the rotating shaft, and a return spring is installed between the side of the extension block away from the rotating shaft and the bottom side of the mounting bracket.

[0023] The above technical solution enables the stress detection mechanism to descend and fit against the surface of the concrete slab during use. At this time, the compression rod on one side rises and contacts the pressure sensor, thereby controlling the solenoid valve on one side to close. This stops the air blowing pipe from blowing air, saving gas and facilitating continuous multi-point testing.

[0024] Compared with the prior art, the beneficial effects of the present invention are: the stress testing device for precast concrete slabs in prefabricated buildings:

[0025] 1. This stress testing device for precast concrete slabs in prefabricated buildings, when in use, utilizes a cleaning mechanism installed on one side of the stress testing mechanism. This cleaning mechanism, along with its internal components including a positioning rack, limiting gears, bevel gear set, rotating rod, turntable, positioning column, limiting frame, auxiliary slide, and extension rod, allows the moving frame to drive the stress testing mechanism. This causes the turntable on one side to rotate, resulting in the extension rods on both sides driving a cleaning plate on one side to reciprocate against the surface of the concrete slab. The cleaning plate has a serrated edge on one side. This allows the moving frame to work in conjunction with the reciprocating movement of the cleaning plate to rub against and remove concrete aggregate residue adhering to the concrete slab surface. The removed residue is then scraped off by an arc-shaped shovel on one side and guided along its trajectory to the collection troughs on both sides. This automatic cleaning and collection of impurities from the concrete slab surface ensures that the stress testing mechanism makes full contact with the concrete slab during testing, guaranteeing the accuracy of the measurement results.

[0026] 2. This stress testing device for precast concrete slabs in prefabricated buildings, when in use, utilizes a system consisting of piston rods, an exhaust check valve, an air storage cylinder, a contact spring, and an inlet check valve. During testing, the concrete slab is placed on a support plate. The weight of the concrete slab causes multiple piston rods at the bottom to descend, directly injecting gas from the suction cylinder into the air storage cylinder on one side. This gas is then stored and can be easily expelled later via a blowing pipe to a small area of ​​the concrete slab surface to be tested, removing dust and ensuring cleanliness. This ensures sufficient contact and accurate test results. No additional air pump components are required, making the device easy to use.

[0027] 3. This stress testing device for precast concrete slabs in prefabricated buildings utilizes an internal mounting frame, contact block, rotating shaft, pressure sensor, and solenoid valve within its air-blowing control mechanism. When the electric telescopic rod extends the stress testing mechanism close to the concrete slab surface, one side of the contact block abuts against the contact block, causing one end of the contact block to rotate and contact the pressure sensor at its top. This controls the opening of the solenoid valve on one side, allowing the air-blowing pipe to expel gas for dust removal. When the stress testing mechanism contacts the concrete slab, the compression rod on one side compresses and contacts the pressure sensor, thus controlling the solenoid valve on that side to open. When the solenoid valve closes, the air blowing pipe stops blowing air. Simultaneously, after the test is completed, the contact block rises with the stress detection mechanism and contacts the contact block. At this time, one end of the contact block rotates towards the side away from the pressure sensor, so that one end of the contact block will not contact the pressure sensor, thus preventing the solenoid valve on one side from opening. This allows the entire system to be used in an orderly manner during air blowing, preventing continuous gas discharge and waste, which would affect subsequent normal use. The overall performance is good. At the same time, the extension block and return spring ensure that the contact block is always in a parallel state when not in contact, ensuring stable overall operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0029] Figure 2 This is a three-dimensional structural diagram of the installation of the movable frame and the limiting block of the present invention;

[0030] Figure 3 This is a three-dimensional cross-sectional view of the gas storage mechanism and the support platform of the present invention.

[0031] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0032] Figure 5This is a three-dimensional structural diagram of the air blowing control mechanism and the electric telescopic rod of the present invention.

[0033] Figure 6 This is a bottom-view perspective view of the cleaning mechanism and the mobile frame installation structure of the present invention;

[0034] Figure 7 For the present invention Figure 1 Enlarged structural diagram at point B;

[0035] Figure 8 For the present invention Figure 6 Enlarged structural diagram at point C.

[0036] In the diagram: 1. Support platform; 2. Gas storage mechanism; 201. Support plate; 202. Suction cylinder; 203. Piston rod; 204. Exhaust check valve pipe; 205. Gas storage cylinder; 206. Contact spring; 207. Inlet check valve pipe; 208. Hose reel; 209. Air blowing pipe; 3. Rotating screw; 4. Auxiliary rod; 5. Stepper motor; 6. Moving frame; 7. Limit block; 8. Electric telescopic rod; 9. Stress detection mechanism; 10. Air blowing control mechanism; 1001. Mounting frame; 1002. Contact block; 1003. Contact block; 1004. Rotating shaft; 1005. Pressure sensor one; 1006. Solenoid valve; 007. Extrusion rod; 1008. Pressure sensor II; 1009. Limiting spring; 10010. Extension block; 10011. Reset spring; 11. Cleaning mechanism; 1101. Fixing frame; 1102. Rotating rod; 1103. Auxiliary block; 1104. Limiting rotating rod; 1105. Positioning rack; 1106. Limiting gear; 1107. Bevel gear set; 1108. Turntable; 1109. Positioning column; 11010. Limiting frame; 11011. Auxiliary slide; 11012. Extension rod; 11013. Cleaning plate; 11014. Shovel plate; 11015. Collection trough; 12. Concrete slab body. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1-8This invention provides a technical solution: a stress testing device for precast concrete slabs in prefabricated buildings, comprising a support platform 1, a movable frame 6 disposed on one side of the top of the support platform 1, a rotating screw 3 and an auxiliary rod 4 respectively mounted and rotatably disposed on both sides of the support platform 1, a stepper motor 5 disposed on one side of the support platform 1, and the output end of the stepper motor 5 being fixedly installed with the rotating screw 3, the bottom ends of the movable frame 6 being respectively disposed through the outside of one side of the rotating screw 3 and the auxiliary rod 4, a concrete slab body 12 disposed on one side of the top of the support platform 1, and a cavity pre-formed inside the top of the support platform 1; the top of the movable frame 6 being internally... A rotating lead screw 3 is also installed, and a stepper motor 5 is also installed on the outside of one side of the moving frame 6. The output end of the stepper motor 5 is installed with one end of the rotating lead screw 3 inside the top of the moving frame 6. A limit block 7 is slidably engaged on one side of the top of the moving frame 6. The rotating lead screw 3 inside the top of the moving frame 6 penetrates one side of the limit block 7. An electric telescopic rod 8 is installed on the bottom side of the limit block 7. A stress detection mechanism 9 is installed at the output end of the electric telescopic rod 8. A cleaning mechanism 11 is located on the outside of one side of the moving frame 6. The function of the cleaning mechanism 11 is to remove impurities adhering to the surface of the concrete slab body 12.

[0039] In this embodiment, the stress testing device for precast concrete slabs in prefabricated buildings mainly includes a support platform 1, a movable frame 6, a stress detection mechanism 9, and a cleaning mechanism 11. In actual use, the stress testing device for precast concrete slabs in prefabricated buildings provided by this solution can control the rotation of the stepper motor 5 and the rotating screw 3 on one side of the support platform 1, thereby causing the movable frame 6 at the top of the support platform 1 to move. Simultaneously, the rotation of the stepper motor 5 and the rotating screw 3 at the top of the movable frame 6, in conjunction with the rotation of the stepper motor 5 and the rotating screw 3 at the top of the movable frame 6, allows the limiting block 7 at the bottom to drive the electric telescopic rod 8 and the stress detection mechanism 9 to move, thus enabling the entire system to move accordingly. The position of the stress detection mechanism 9 can be changed at will, so that stress detection can be performed at any position on the surface of the concrete slab body 12, thereby realizing multi-point detection and improving the accuracy of the overall detection results. During use, as the moving frame 6 moves from one side of the support platform 1 to the other side, it drives the cleaning mechanism 11 on one side to move against the surface of the concrete slab body 12, so that impurities on the surface of the concrete slab body 12 can be automatically cleaned and collected during the detection. This ensures that the stress detection mechanism 9 makes full contact with the concrete slab body 12 during the detection, thus ensuring the accuracy of the measurement results.

[0040] In some embodiments, the cleaning mechanism 11 includes a fixed frame 1101, a cleaning plate 11013, and a shovel plate 11014. The fixed frame 1101 is installed on one side of the movable frame 6. The shovel plate 11014 is installed on the side of the fixed frame 1101 near the concrete slab body 12. The shovel plate 11014 is generally arc-shaped. The cleaning plate 11013 is fitted to the bottom end of the shovel plate 11014, and the side of the cleaning plate 11013 near the top surface of the concrete slab body 12 is serrated. The cleaning mechanism 11 also includes a rotating rod 1102, an auxiliary block 1103, a limiting rotating rod 1104, and a positioning rack 1105. The system includes a limiting gear 1106, a bevel gear set 1107, a turntable 1108, a positioning pin 1109, a limiting frame 11010, an auxiliary slide 11011, an extension rod 11012, and a collection groove 11015. A rotating rod 1102 is rotatably installed inside the bottom side of the fixed frame 1101 at the middle position. A limiting rotating rod 1104 is laterally positioned on one side of the bottom end of the fixed frame 1101. An auxiliary block 1103 is rotatably installed outside one side of the limiting rotating rod 1104, and one side of the auxiliary block 1103 is fixedly installed on the inner wall of the bottom side of the fixed frame 1101. A positioning rack 1105 is installed on the outer side of the top of the support platform 1. The positioning gear 1106 is fixedly installed on the outside of one side of the limiting rotating rod 1104, and one side of the limiting gear 1106 is meshed with one side of the positioning rack 1105. A bevel gear set 1107 is installed between the top end of the rotating rod 1102 and one end of the limiting rotating rod 1104, so that the limiting rotating rod 1104 rotates while the fixed frame 1101 moves, thereby driving the rotating rod 1102 to rotate. The turntable 1108 is fixedly installed on the outside of the bottom end of the rotating rod 1102 at the middle position of one side. The positioning post 1109 is installed on the edge of the bottom end of the turntable 1108. An auxiliary slide groove 11011 is provided through the inside of the limiting frame 11010. The limiting frame 11010 is slidably sleeved and installed outside the positioning column 1109. Extension rods 11012 are fixedly installed on both sides of the bottom end of the limiting frame 11010 near the moving frame 6. Both ends of the extension rods 11012 are slidably installed through and outside the bottom end of the fixed frame 1101. One side of the cleaning plate 11013 is fixedly installed with one side of the two extension rods 11012. A collection trough 11015 is fixedly installed inside one side of the support platform 1 near the two edges of the scooping plate 11014. The collection trough 11015 is inclined as a whole, and the inclined end of the collection trough 11015 is installed through and outside one side of the support platform 1.

[0041] When the entire device is in use, it is combined with Figure 1 , Figure 6 , Figure 7 and Figure 8As shown, firstly, the concrete slab body 12 to be inspected is hoisted and placed parallel to the top of the bearing plate 201 using existing hoisting equipment. Then, during the inspection process, the moving frame 6 at the top is able to move against the surface of the concrete slab body 12 through the cooperation of a stepper motor 5, a rotating lead screw 3, and an auxiliary rod 4. During the movement of the moving frame 6, the fixed frame 1101 on one side moves simultaneously. The movement of the fixed frame 1101, combined with the meshing connection between a limiting gear 1106 and a positioning rack 1105, causes the limiting gear 1106 to rotate. This rotation of the limiting gear 1106 drives the limiting rotating rod 1104 on one side to rotate simultaneously. The rotation of the limiting rotating rod 1104, combined with the installation of a bevel gear set 1107 on one side, drives the... The rotating rod 1102 rotates simultaneously, causing the turntable 1108 at the bottom to rotate. Simultaneously, the positioning column 1109, the limiting frame 11010, and the auxiliary slide 11011 are installed and coordinated, causing the limiting frame 11010 to drive the side extension rod 11012 to reciprocate between the fixed frame 1101. This causes the cleaning plate 11013 on one side to reciprocate against the surface of the concrete slab body 12. Since one side of the cleaning plate 11013 is serrated, during the advancement of the moving frame 6, the reciprocating motion of the cleaning plate 11013 rubs away any concrete aggregate residue adhering to the surface of the concrete slab body 12, causing it to detach from the surface and thus enabling automatic cleaning.

[0042] At the same time, after the friction separation, the arc-shaped shovel plate 11014 on one side is set to bring the separated stone chips together and shovel them. As more and more stone chips and other impurities are shoveled, the impurities and stone chips are guided by the trajectory of the shovel plate 11014 and fall into the collection troughs 11015 set on both sides. Then they roll out from one side and are collected and processed.

[0043] This allows for the automatic cleaning and collection of impurities on the surface of the concrete slab 12 during testing, ensuring that the stress testing mechanism 9 makes full contact with the concrete slab 12 during testing, thus guaranteeing the accuracy of the measurement results.

[0044] In some embodiments, an air storage mechanism 2 is provided in the internal cavity at the top of the support platform 1. The air storage mechanism 2 includes a support plate 201, a suction cylinder 202, a piston rod 203, an exhaust one-way valve pipe 204, an air storage cylinder 205, a contact spring 206, an inlet one-way valve pipe 207, a hose reel 208, and an air blowing pipe 209. The support plate 201 is attached to the bottom outer surface of the concrete slab body 12. The suction cylinders 202 are longitudinally fixedly installed at equal intervals on the bottom wall of the internal cavity of the support platform 1. A piston rod 203 is installed inside each suction cylinder 202, and the top of each piston rod 203 is fixedly installed on the bottom outer surface of one side of the support plate 201. The air storage cylinder 205 is embedded in the internal cavity of one side of the support platform 1. An exhaust one-way valve pipe 204 is provided through the bottom side of each suction cylinder 202. 04, and the output end of the exhaust one-way valve pipe 204 is installed inside one side of the air storage cylinder 205. The bottom end of the suction cylinder 202 is connected to the other side of the intake one-way valve pipe 207. The top end of the piston rod 203 is fixedly installed between the top side and the bottom wall of the cavity inside the support platform 1. The piston rod 203 rebounds and resets after losing pressure. The air inlet end of the blowing pipe 209 is connected inside one side of the air storage cylinder 205. The hose reel 208 is fixedly installed outside the top side of the support platform 1. The blowing pipe 209 is wrapped around the outside of the hose reel 208. The air outlet end of the blowing pipe 209 is installed outside the edge of one side of the stress detection mechanism 9. The air outlet end of the blowing pipe 209 faces the bottom side of the stress detection mechanism 9.

[0045] When using the whole, combine Figure 2 and Figure 3 As shown, before the test, when the concrete slab body 12 is placed on top of the bearing plate 201, the weight of the concrete slab body 12 itself causes the piston rod 203 at the bottom to be compressed. At this time, the contact spring 206 on one side is compressed at the same time. Through the downward pressure of the piston rod 203, the gas inside the suction cylinder 202 is injected into the air storage cylinder 205 through the exhaust one-way valve pipe 204 for storage. This makes it easy to discharge the gas stored in the air storage cylinder 205 through the air blowing pipe 209 later. The top surface of the concrete slab body 12 that the stress testing mechanism 9 needs to contact for testing is blown with air in a small range. This is a secondary dust removal after the cleaning mechanism 11, ensuring cleanliness, ensuring sufficient contact, and ensuring the accuracy of the test results. The whole system does not require any other external air pump components and is easy to use.

[0046] When the entire system is in use, after the inspection of one concrete slab body 12 is completed, the concrete slab body 12 is removed. After the concrete slab body 12 is removed, the bottom contact spring 206 is no longer under force, thus rebounding, causing the piston rod 203 and the bearing plate 201 to rebound as a whole. At this time, with the setting of the one-way air inlet valve pipe 207, the piston rod 203 draws outside air into the suction cylinder 202 during the lifting process. This makes it convenient to refill the air storage cylinder 205 on one side for future use when inspecting and placing other concrete slab bodies 12. This makes the whole system convenient to use and has a good overall performance.

[0047] In some embodiments, an air blowing control mechanism 10 is provided on the outside of one side of the electric telescopic rod 8. The air blowing control mechanism 10 includes a mounting bracket 1001, an abutment block 1002, a contact block 1003, a rotating shaft 1004, a pressure sensor 1005, a solenoid valve 1006, a squeezing rod 1007, a pressure sensor 1008, a limit spring 1009, an extension block 10010, and a return spring 10011. The solenoid valve 1006 is conductively installed inside one side of the air blowing pipe 209. The mounting bracket 1001... 1. A longitudinally fixed installation is made on the outer side of the bottom end of the outer rod of the electric telescopic pole 8. An abutment block 1002 is fixedly installed on the outer side of the inner rod of the electric telescopic pole 8 near the bottom end of the mounting bracket 1001. The end of the abutment block 1002 near the mounting bracket 1001 is arc-shaped. A contact block 1003 is provided on the side of the mounting bracket 1001 near the bottom end of the abutment block 1002, and the end of the contact block 1003 near the abutment block 1002 is also arc-shaped. The contact block 1003 is internally fixed on the side near the middle position. A rotating shaft 1004 is provided. Pressure sensor 1005 is fixedly mounted on the mounting bracket 1001 at the top of the contact block 1003. A compression rod 1007 is longitudinally slidably engaged at one edge of the bottom end of the stress detection mechanism 9. A limit spring 1009 is sleeved on the outside of the bottom end of the compression rod 1007. Pressure sensor 1008 is mounted on the outside of the stress detection mechanism 9 near the top of the compression rod 1007. Both pressure sensor 1005 and pressure sensor 1008 are... Electrically connected to solenoid valve 1006, pressure sensor 1005 controls solenoid valve 1006 to open, and pressure sensor 1008 controls solenoid valve 1006 to close. Both ends of rotating shaft 1004 are rotatably mounted on the outside of both sides of mounting bracket 1001. An extension block 10010 is fixedly mounted on one side of rotating shaft 1004, and a return spring 10011 is installed between the side of extension block 10010 away from rotating shaft 1004 and the bottom side of mounting bracket 1001.

[0048] When using the whole, combine Figure 1 , Figure 4 and Figure 5As shown, when the stress testing mechanism 9 needs to perform a contact stress test on one side of the top of the concrete slab body 12, it first activates the electric telescopic rod 8 on one side. When the inner rod of the electric telescopic rod 8 extends, it drives the abutment block 1002 on one side to descend simultaneously. When the abutment block 1002 descends to a certain position, one end of it abuts against one end of the contact block 1003. Then it continues to descend. At this time, through the installation of the rotating shaft 1004, the abutment block 1002 abuts against the contact block 1003. At this time, the contact block 1003 is subjected to force and rotates, thereby causing one side of the contact block 1003 to rotate and tilt. When the entire structure is raised a certain distance, one side of the contact block 1003 comes into contact with the pressure sensor 1005 on the top side. At this time, the pressure sensor 1005 sends a signal to control the solenoid valve 1006 on one side to open. Through the opening of the solenoid valve 1006, the gas that has been compressed and stored in the air storage cylinder 205 is discharged from the output end of the air blowing pipe 209 on one side, and blown towards the surface of the area to be tested on the top of the concrete slab body 12. This allows for secondary air blowing and dust removal after the cleaning mechanism 11 has finished its work, ensuring cleanliness, ensuring sufficient contact of the entire structure, and ensuring the accuracy of the test results.

[0049] When the electric telescopic rod 8 extends and drives the stress detection mechanism 9 to descend to a certain height, the bottom end of the compression rod 1007 contacts the surface of the concrete slab body 12. It continues to descend and is subjected to force and resistance, which compresses the compression rod 1007 and the limit spring 1009. When the stress detection mechanism 9 comes into contact with the surface of the concrete slab body 12, the compression rod 1007 contacts the pressure sensor 1008 at the top. At this time, the pressure sensor 1008 sends a signal to control the solenoid valve 1006 on one side to close and the electric telescopic rod 8 to stop extending, which stops the air blowing pipe 209 from blowing air. This prevents the continuous emission of gas during the test, which would cause ineffective emission and cause the gas inside the air storage cylinder 205 to leak too quickly, making it inconvenient for subsequent multi-point test air blowing. The overall self-opening and closing operation ensures the rational use of resources.

[0050] When a detection contact is made on the surface of the concrete slab body 12, the electric telescopic rod 8 on one side drives the stress detection mechanism 9 at the bottom to retract. After the inner rod of the electric telescopic rod 8 retracts to a certain position, the abutment block 1002 on one side abuts against the contact block 1003 again. Since the abutment block 1002 has an upward retraction force, one side of the contact block 1003 rotates downward and not upward, so it will not abut against the pressure sensor 1005. This prevents the solenoid valve 1006 on one side from opening, allowing the whole system to operate automatically during use without causing gas loss from the air storage tank 205, resulting in good overall performance.

[0051] Meanwhile, during use, the extension block 10010 and the reset spring 10011 ensure that after the contact block 1003 loses contact with the abutment block 1002, it can automatically rotate and spring back to the initial parallel position, which facilitates subsequent use and ensures the stability and smoothness of the overall use, thus guaranteeing the overall performance.

[0052] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stress testing device for precast concrete slabs in prefabricated buildings, comprising a support platform (1), characterized in that: A movable frame (6) is provided on one side of the top of the support platform (1). A rotating screw (3) and an auxiliary rod (4) are respectively installed on both sides of the support platform (1). A stepper motor (5) is installed on one side of the support platform (1), and the output end of the stepper motor (5) is fixed to the rotating screw (3). The bottom sides of the movable frame (6) are respectively provided outside one side of the rotating screw (3) and the auxiliary rod (4). A concrete slab body (12) is provided on one side of the top of the support platform (1). A cavity is pre-set inside the top of the support platform (1). The top of the movable frame (6) is also equipped with a rotating screw (3), and a stepper motor (5) is also installed on the outside of one side of the movable frame (6). The output end of the stepper motor (5) is installed with one end of the rotating screw (3) inside the top of the movable frame (6). A limit block (7) is slidably engaged on one side of the top of the movable frame (6). The rotating screw (3) inside the top of the movable frame (6) penetrates one side of the limit block (7). An electric telescopic rod (8) is installed on one side of the bottom of the limit block (7). A stress detection mechanism (9) is installed at the output end of the electric telescopic rod (8). The cleaning mechanism (11) is located on the outside of one side of the movable frame (6). The function of the cleaning mechanism (11) is to remove impurities adhering to the surface of the concrete slab body (12). The cleaning mechanism (11) includes a fixed frame (1101), a cleaning plate (11013) and a shovel plate (11014). The fixed frame (1101) is installed on the outside of one side of the movable frame (6). The shovel plate (11014) is installed on the side of the fixed frame (1101) close to the concrete slab body (12). The shovel plate (11014) is arc-shaped. The cleaning plate (11013) is fitted to the bottom side of the shovel plate (11014). The side of the cleaning plate (11013) close to the top surface of the concrete slab body (12) is serrated. The cleaning mechanism (11) also includes a rotating rod (1102), an auxiliary block (1103), a limiting rotating rod (1104), a positioning rack (1105), a limiting gear (1106), a bevel gear set (1107), a turntable (1108), a positioning column (1109), a limiting frame (11010), an auxiliary slide (11011), an extension rod (11012), and a collection groove (11015). The rotating rod (1102) is rotatably installed inside the bottom side of the fixed frame (1101) in the middle position. The limiting rotating rod (1104) is horizontally arranged on the bottom side of the fixed frame (1101). The auxiliary block (1103) is rotatably installed outside the side of the limiting rotating rod (1104), and one side of the auxiliary block (1103) is fixedly installed on the inner wall of the bottom side of the fixed frame (1101). The positioning rack (1105) is installed on the outside of one side of the top of the support platform (1), the limiting gear (1106) is fixedly installed on the outside of one side of the limiting rotating rod (1104), and one side of the limiting gear (1106) is meshed with one side of the positioning rack (1105). A bevel gear set (1107) is installed between one side of the top of the rotating rod (1102) and one end of the limiting rotating rod (1104), so that the limiting rotating rod (1104) rotates while the fixed frame (1101) moves; The turntable (1108) is fixedly installed at the middle position on one side of the rotating rod (1102) outside the bottom end. The positioning post (1109) is installed at the edge of the bottom end of the turntable (1108). The interior of the limiting frame (11010) is provided with an auxiliary sliding groove (11011), and the limiting frame (11010) is slidably sleeved on the outside of the positioning post (1109). The limiting frame (11010) is fixedly provided with extension rods (11012) on both sides of the bottom end near the moving frame (6). Both ends of the extension rods (11012) are slidably installed through the bottom ends of the fixed frame (1101) outside the bottom ends. One side of the cleaning plate (11013) is fixedly installed with one side of the two extension rods (11012).

2. The stress testing device for precast concrete slabs in prefabricated buildings according to claim 1, characterized in that: The support platform (1) has a collection trough (11015) fixedly installed inside one side of the edge of the scooping plate (11014). The collection trough (11015) is inclined, and the inclined end of the collection trough (11015) is installed through the outside of one side of the support platform (1).

3. The stress testing device for precast concrete slabs in prefabricated buildings according to claim 1, characterized in that: The bearing platform (1) has an air storage mechanism (2) in the cavity at the top. The air storage mechanism (2) includes a bearing plate (201), a suction cylinder (202), a piston rod (203), an exhaust one-way valve pipe (204), an air storage cylinder (205), a contact spring (206), an air inlet one-way valve pipe (207), a hose reel (208), and an air blowing pipe (209). The bearing plate (201) is attached to the bottom outer surface of the concrete slab body (12). The suction cylinders (202) are longitudinally fixed at equal intervals on the bottom wall of the cavity inside the bearing platform (1). A piston rod (203) is installed inside each suction cylinder (202). The top of each piston rod (203) is fixedly installed on the bottom outer surface of one side of the bearing plate (201).

4. The stress testing device for precast concrete slabs in prefabricated buildings according to claim 3, characterized in that: The gas storage cylinder (205) is embedded in the cavity inside one side of the support platform (1). The bottom side of the suction cylinder (202) is provided with an exhaust one-way valve pipe (204) and the output end of the exhaust one-way valve pipe (204) is installed inside one side of the gas storage cylinder (205). The other side of the bottom of the suction cylinder (202) is provided with an intake one-way valve pipe (207).

5. A stress testing device for precast concrete slabs in prefabricated buildings according to claim 4, characterized in that: A retaining spring (206) is fixedly installed between the top side of the piston rod (203) and the bottom wall of the cavity inside the support platform (1), so that the piston rod (203) will rebound and reset after losing pressure. The air inlet end of the air blowing pipe (209) is connected and installed inside the air storage cylinder (205) on one side. The hose reel (208) is fixedly installed outside the top side of the support platform (1), and the air blowing pipe (209) is wrapped around the outside of the hose reel (208). The air outlet end of the air blowing pipe (209) is installed outside the edge of one side of the stress detection mechanism (9), and the air outlet end of the air blowing pipe (209) faces the bottom side of the stress detection mechanism (9).

6. The stress testing device for precast concrete slabs in prefabricated buildings according to claim 5, characterized in that: An air blowing control mechanism (10) is provided on one side of the electric telescopic rod (8). The air blowing control mechanism (10) includes a mounting bracket (1001), an abutment block (1002), a contact block (1003), a rotating shaft (1004), a pressure sensor one (1005), a solenoid valve (1006), a squeezing rod (1007), a pressure sensor two (1008), a limit spring (1009), an extension block (10010), and a return spring (10011). The solenoid valve (1006) is connected to a valve installed on the air blowing pipe (209). Inside the side, the mounting bracket (1001) is longitudinally fixedly installed on the outside of the bottom end of the outer rod of the electric telescopic rod (8). The abutment block (1002) is fixedly installed on the outside of the bottom end of the inner rod of the electric telescopic rod (8) near the mounting bracket (1001). The abutment block (1002) is arc-shaped at one end near the mounting bracket (1001). A contact block (1003) is provided on one side of the mounting bracket (1001) near the bottom end of the abutment block (1002), and the contact block (1003) is also arc-shaped at one end near the abutment block (1002).

7. A stress testing device for precast concrete slabs in prefabricated buildings according to claim 6, characterized in that: A rotating shaft (1004) is fixedly installed inside the contact block (1003) near the middle position. The pressure sensor one (1005) is fixedly installed on the mounting bracket (1001) at the top of the contact block (1003). A compression rod (1007) is longitudinally slidably engaged at the bottom edge of the stress detection mechanism (9). A limit spring (1009) is sleeved on the bottom of the compression rod (1007) and abuts against it. A pressure sensor two (1008) is installed on the outside of the stress detection mechanism (9) near the top of the compression rod (1007). The pressure sensor one (1005) and the pressure sensor two (1008) are fixedly installed inside the contact block (1003) near the middle position. Force sensor two (1008) is electrically controlled to solenoid valve (1006). Pressure sensor one (1005) controls solenoid valve (1006) to open, and pressure sensor two (1008) controls solenoid valve (1006) to close. Both ends of the rotating shaft (1004) are rotatably installed on the outside of the two sides of the mounting bracket (1001). An extension block (10010) is fixedly installed on one side of the rotating shaft (1004). A return spring (10011) is installed between the side of the extension block (10010) away from the rotating shaft (1004) and the bottom side of the mounting bracket (1001).

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