A fiber grating expansion joint testing device for construction engineering

Abstract

This invention relates to the field of testing equipment technology, and more particularly to a fiber optic expansion joint testing device for building engineering. The device includes a base plate, a mounting frame fixedly connected to the top of the base plate, a movable plate slidably connected inside the mounting frame, a cleaning mechanism on one side of the base plate, a recycling mechanism on the top of the mounting frame, an expansion detection mechanism and a pressure resistance detection mechanism inside the mounting frame, an early warning mechanism on the top of the movable plate, and a collection box fixedly installed at the top of the mounting frame. This invention controls the expansion detection mechanism using an electric push rod and a cylinder to achieve cleaning of the inner wall of the expansion joint and performance testing. The electric push rod cleans impurities, the cylinder heats the rubber strip to test expansion performance, and gas is stored for pressure resistance testing. The movement of the push plate triggers an alarm to prevent damage to the rubber strip, thus improving overall testing efficiency and safety.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to a fiber grating expansion joint testing device for construction engineering. Background Art

[0002] At present, in large-scale civil engineering and model tests, it is often necessary to monitor the displacement of cracks and fissures in different ranges in real time. Fiber Bragg gratings are small in size, light in weight, resistant to electromagnetic interference, waterproof and moisture-proof, easy to use and maintain. Sensors based on fiber Bragg gratings have the characteristics of large bandwidth range, small additional loss, strong wavelength coding anti-interference ability, miniaturized devices, good coupling performance, and integration of "transmission" and "sensing". Therefore, they are widely used in civil engineering, aerospace, biomedicine, petrochemical and other industries.

[0003] However, in the prior art, the detection process of expansion joints relies on manual operation and the use of handheld tools for measurement, which is not only labor-intensive and time-consuming, but also has a single detection method, which is mainly limited to the detection of expansion performance and lacks an evaluation of the expansion joint's compressive performance. In addition, dust and impurities are easily accumulated in the expansion joints, and there is no automatic removal of dust, dirt and other impurities in the expansion joints. The accumulation of dust, dirt and other impurities in the expansion joints will affect the detection of bridge expansion joints.

[0004] In view of this, research and improvements are conducted on the existing problems, and a fiber grating expansion joint testing device for construction engineering is provided to improve the efficiency and accuracy of detection, while increasing the testing capability of the compression performance of the expansion joint. The purpose is to solve the problem and improve the practical value through this technology. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings existing in the prior art, and a fiber grating expansion joint testing device for construction engineering is proposed. The present invention controls the expansion detection mechanism through an electric push rod and a cylinder to realize the cleaning of the inner wall of the expansion joint and the performance detection. The electric push rod cleaning brush cleans impurities, and the cylinder heats the rubber strip to detect the expansion performance. At the same time, the gas storage is used for pressure resistance testing, and the push plate moves to trigger the alarm to prevent damage to the rubber strip, thereby improving the overall detection efficiency and safety.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fiber grating expansion joint testing device for construction engineering, comprising a base plate, a mounting frame is fixedly connected to the top of the base plate, a movable plate is slidably connected to the inside of the mounting frame, a cleaning mechanism is arranged on one side of the base plate, a recycling mechanism is arranged on the top of the mounting frame, a telescopic detection mechanism and a pressure resistance detection mechanism are arranged inside the mounting frame, and an early warning mechanism is arranged on the top of the movable plate; the recycling mechanism comprises a collecting box, the collecting box is fixedly installed on the top of the mounting frame, a dust suction fan is fixedly installed on the top of the collecting box, a feeding pipe is fixedly connected to one side of the dust suction fan, and a connecting pipe is fixedly connected to the outer wall of the feeding pipe; the telescopic detection mechanism comprises an air disk, the air disk is arranged below the movable plate, a heat-conducting copper pipe is fixedly installed on the bottom of the air disk, a heating block is fixedly installed on the bottom end of the heat-conducting copper pipe, and the air The cam is provided with a plurality of connecting rods, and the connecting rods are connected with the connecting rods at two ends respectively.

[0007] Preferably, the cleaning mechanism comprises an electric push rod, which is fixedly mounted on the bottom end of one side of the base plate, a rotating drum is fixedly mounted on the output end of the electric push rod, and a cleaning brush is fixedly mounted on the bottom of the rotating drum.

[0008] Preferably, a dust collector head is detachably mounted on one end of the feed pipe, a filter is fixedly mounted inside the connecting pipe, and one end of the connecting pipe is fixedly connected to the inside of the air storage box.

[0009] Preferably, a spring A is arranged inside the sleeve, and the spring A is sleeved on the periphery of the moving rod, and the air disk and the air storage box are fixedly connected through an air supply pipe.

[0010] Preferably, the movable plate and the gas disk are fixedly connected via a plurality of groups of shock absorbers, and the plurality of groups of shock absorbers are distributed in a linear array along the axial direction of the movable plate.

[0011] Preferably, a spring C is arranged inside the cylinder, and the spring C is sleeved on the outside of the slide rod.

[0012] Preferably: the early warning mechanism includes an installation box, the installation box is fixedly installed on the top of the movable plate, the installation box is slidably connected to a guide rod inside, one end of the guide rod is fixedly connected to an insulating plate, a conductive sheet A is fixedly installed on one side of the insulating plate, the installation box is slidably connected to a conductive sheet B inside, and an insulating spring is fixedly installed on the side of the conductive sheet B away from the conductive sheet A.

[0013] Preferably: the early warning mechanism also includes a gear, which is rotatably installed on the top of the movable plate through a rotating shaft, the top of the gear is meshedly connected with a rack A, one end of the rack A is fixedly connected to one end of the guide rod, and the bottom of the gear is meshedly connected with a rack B, one end of the rack B is fixedly connected to the push plate through a connecting plate.

[0014] Preferably, a pressure detector is disposed on the top of the pressing plate, a displacement sensor is disposed on one side of the pushing plate, and both the pressure detector and the displacement sensor are electrically connected to an external display.

[0015] Preferably, four groups of universal wheels are fixedly installed at the bottom of the base plate, and a handrail frame is fixedly installed at one side of the base plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes an electric push rod to drive a cleaning brush to penetrate deep into the expansion joint, quickly clean impurities on the inner wall, ensure cleanliness, and avoid detection errors. After cleaning, a dust suction fan sucks impurities into a collection box, and stores gas in a gas storage box for use by the expansion detection mechanism and pressure resistance detection, thereby improving test efficiency and resource utilization.

[0018] 2. The present invention controls the telescopic detection mechanism through a cylinder to extend into the expansion joint. The heating block contacts the rubber strip and heats it, causing the gas in the gas disk to expand, pushing the piston and the moving rod, thereby driving the push plate to move. The rubber strip is heated and expanded, the gap of the expansion joint changes, the push plate moves synchronously, and the displacement detector captures the changes and displays them on an external display, thereby monitoring the telescopic performance of the expansion joint under heat in real time to ensure its normal operation.

[0019] 3. The present invention utilizes that when the expansion and contraction detection mechanism has completed the detection, the control valve on the surface of the air supply pipe is manually closed, and the dust suction fan works to transport the generated gas to the inside of the air storage box through the connecting pipe. A part of the gas expanded by the air disc enters the inside of the air storage box through the air supply pipe. When the internal pressure of the air storage box reaches a certain threshold, the sealing ball is pushed downward by the gas, and the gas enters the inside of the air outlet pipe through the gap between the air storage box and the sealing ball. The air pressure inside the cylinder increases, and the gas pushes the sliding rod to move downward, and the sliding rod synchronously drives the mounting plate to move downward, and the mounting plate then drives the pressure plate to squeeze the surface of the expansion joint. As the push plate continues to move, the air pressure inside the cylinder becomes higher and higher, so that the pressure of the pressure plate on the surface of the expansion joint is continuously increased, thereby realizing the detection of the pressure resistance of the expansion joint. The pressure change to which the expansion joint is subjected in actual use is simulated by gas pressurization, so as to detect whether the pressure resistance of the expansion joint meets the requirements, thereby ensuring that the detected expansion joint can maintain the structural integrity and functionality under different pressures.

[0020] 4. The present invention drives the rack B by moving the push plate, which in turn causes the gear to rotate, driving the rack A. When the conductive sheets A and B come into contact, the circuit is closed, triggering the alarm, prompting the staff to turn off the power supply of the heating block, preventing the expansion joint from over-stretching and tearing the rubber strip, thereby protecting the expansion joint structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0022] Figure 2 A schematic diagram of the side structure of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0023] Figure 3 A schematic diagram of the cleaning mechanism structure of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the enlarged structure of part A of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0026] Figure 6 This is a schematic diagram of the enlarged structure of part B of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of the enlarged structure of part C of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of a compressive testing mechanism of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention;

[0029] Fig. 9 This is a schematic diagram of the enlarged structure of part D of a fiber Bragg grating expansion joint testing device for construction engineering proposed by the present invention.

[0030] Legend:

[0031] 1. Bottom plate; 2. Mounting frame; 3. Moving plate; 4. Cleaning mechanism; 401. Electric push rod; 402. Rotating drum; 403. Cleaning brush; 5. Recycling mechanism; 501. Collection box; 502. Dust suction fan; 503. Feed pipe; 504. Connecting pipe; 6. Telescopic detection mechanism; 601. Gas plate; 602. Thermal copper pipe; 603. Heating block; 604. Sleeve; 605. Piston; 606. Moving rod; 607. Push plate; 608. Spring A; 609. Shock absorber; 610. Air pipe; 7. Anti- Pressure detection mechanism; 701, air outlet pipe; 702, air storage box; 703, sealing ball; 704, telescopic rod; 705, spring B; 706, arc plate; 707, cylinder; 708, slide rod; 709, mounting plate; 710, vertical rod; 711, pressure plate; 712, spring C; 8, early warning mechanism; 801, mounting box; 802, guide rod; 803, insulating plate; 804, conductive sheet A; 805, conductive sheet B; 806, insulating spring; 807, gear; 808, rack A; 809, rack B. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides a fiber grating expansion joint testing device for construction engineering, comprising a bottom plate 1, a mounting frame 2 is fixedly connected to the top of the bottom plate 1, a moving plate 3 is slidably connected inside the mounting frame 2, a cleaning mechanism 4 is arranged on one side of the bottom plate 1, a recycling mechanism 5 is arranged on the top of the mounting frame 2, a telescopic detection mechanism 6 and a compression detection mechanism 7 are arranged inside the mounting frame 2, and an early warning mechanism 8 is arranged on the top of the moving plate 3;

[0034] See also Figure 1 to Figure 2As shown, the recovery mechanism 5 includes a collection box 501, which is fixedly installed on the top of the mounting frame 2, and a dust suction fan 502 is fixedly installed on the top of the collection box 501. A feeding pipe 503 is fixedly connected to one side of the dust suction fan 502, and a connecting pipe 504 is fixedly connected to the outer wall of the feeding pipe 503. When the cleaning mechanism 4 cleans the impurities inside the expansion joint, the dust suction fan 502 is started, and the dust suction fan 502 sucks the impurities inside the expansion joint through the feeding pipe 503, and sucks the impurities into the collection box 501, so as to collect the impurities. At the same time, when the dust suction fan 502 is working, a part of the sucked gas is transported to the inside of the gas storage box 702 through the connecting pipe 504 for storage. The gas stored in the gas storage box 702 can be used to assist the expansion and contraction detection mechanism 6, and can also be used for the pressure resistance detection mechanism 7, thereby improving the efficiency and resource utilization of the entire testing device.

[0035] See also Figures 4 to 5 As shown, the telescopic detection mechanism 6 includes an air disk 601, which is arranged below the movable plate 3. A heat-conducting copper tube 602 is fixedly installed at the bottom of the air disk 601, and a heating block 603 is fixedly installed at the bottom end of the heat-conducting copper tube 602. Both sides of the air disk 601 are fixedly connected with a sleeve 604 through an air delivery pipe. A piston 605 is slidably connected inside the sleeve 604. A moving rod 606 is fixedly connected to one side of the piston 605. One end of the moving rod 606 that passes through the outside of the sleeve 604 is fixedly connected to a push plate 607. When the cleaning mechanism 4 cleans out the impurities in the expansion joint, the telescopic detection mechanism 6 is lowered and penetrated into the expansion joint by starting the cylinder. When the heating block 603 is lowered to contact the rubber strip inside the expansion joint, the power is turned on to heat the heating block 603, so that the heating block 603 is heated. The expansion joint is heated. As the temperature of the heating block 603 continues to rise, the heated volume of the gas inside the gas disk 601 continues to increase, so that the internal air pressure of the gas disk 601 can push the push plate 607 to move, and the gas enters the inside of the casing 604 through the gas pipe, so that the internal pressure of the casing 604 pushes the piston 605 to drive the moving rod 606 to move, so that the moving rod 606 synchronously drives the push plate 607 to move. As the heating block 603 heats the inside of the expansion joint, the rubber strip is gradually expanded by the heat, and the gap of the expansion joint changes accordingly. The synchronous movement of the push plate 607 causes the position of the displacement detector to change. The displacement change detected by the displacement detector is transmitted to the external display. Whether the expansion joint can be normally expanded and contracted when heated is observed through the external display to ensure the normal working performance of the expansion joint;

[0036] In addition, the control valve on the surface of the air delivery pipe 610 can be opened manually, so that the gas inside the air storage box 702 enters the inside of the air disk 601, so that the internal air pressure of the air disk 601 is further increased, so that the force of pushing the push plate 607 is increased, thereby increasing the pressure on the expansion joint detection and improving its detection flexibility;

[0037] See also Figures 8 to 9 As shown, the compression detection mechanism 7 includes an air outlet pipe 701, which is fixedly installed on the top of the mounting frame 2, and the top of the air outlet pipe 701 is fixedly connected to the air storage box 702. The inside of the air outlet pipe 701 is movably connected to a sealing ball 703. The inner wall of the air outlet pipe 701 is rotatably installed with a telescopic rod 704 through a rotating seat. The outer wall of the telescopic rod 704 is sleeved with a spring B705. One end of the telescopic rod 704 is fixedly connected to an arc plate 706. The top of the arc plate 706 is connected to the sealing ball 703. The bottom of the gas outlet pipe 701 is fixedly connected with a cylinder 707 through a gas delivery pipe. The inside of the cylinder 707 is slidably connected with a slide rod 708. One end of the slide rod 708 that passes through the outside of the cylinder 707 is fixedly connected with a mounting plate 709. The bottom of the mounting plate 709 is fixedly connected with a vertical rod 710. The bottom of the vertical rod 710 is fixedly connected with a pressure plate 711. As the gas continues to enter, the pressure inside the gas storage box 702 gradually increases. When the pressure inside the gas storage box 702 reaches a certain threshold, the air storage box 702 is sealed. The sealing ball 703 is pushed downward by the gas, and the sealing ball 703 moves downward to squeeze the arc plate 706. The arc plate 706 moves downward and contracts due to the action of the telescopic rod 704, and the gas enters the interior of the gas outlet pipe 701 through the gap between the gas storage box 702 and the sealing ball 703, and the gas enters the interior of the cylinder 707 through the gas supply pipe. As the gas enters, the air pressure inside the cylinder 707 increases, and the gas pushes the sliding rod 708 to move downward, and the sliding rod 708 simultaneously drives the mounting plate 709 to move downward, and the mounting plate 709 then drives the pressing plate 711 to squeeze the surface of the expansion joint. As the push plate 607 continues to move, the air pressure inside the cylinder 707 becomes higher and higher, so that the pressure of the pressing plate 711 on the surface of the expansion joint continues to increase, thereby realizing the detection of the pressure resistance of the expansion joint. By using gas pressurization to simulate the pressure changes to which the expansion joint is subjected in actual use, it is possible to detect whether the pressure resistance of the expansion joint meets the requirements, thereby ensuring that the detected expansion joint can maintain the structural integrity and functionality under different pressures.

[0038] In addition, when the control valve on the surface of the air duct 610 is opened, after the expansion joint is detected, the control valve on the surface of the air duct 610 is manually closed, and the dust suction fan 502 works to deliver the generated gas only to the inside of the air storage box 702 through the connecting pipe 504.

[0039] It is also noted that: when the internal pressure of the gas storage box 702 reaches a certain threshold, the sealing ball 703 is pushed downward by the gas. The threshold here can be adjusted according to actual conditions by manually opening the arc-shaped connector at one end of the gas outlet pipe 701 and replacing the specifications of the spring B705. The threshold can be reached during the detection process of the telescopic detection mechanism 6, or after the telescopic detection mechanism 6 has completed the detection, thereby further improving the flexibility of detection.

[0040] See also Figures 1 to 3 As shown, the cleaning mechanism 4 includes an electric push rod 401, which is fixedly mounted on the bottom end of one side of the base plate 1, and a rotating drum 402 is fixedly mounted on the output end of the electric push rod 401, and a cleaning brush 403 is fixedly mounted on the bottom of the rotating drum 402. By starting the electric push rod 401, the rotating drum 402 is extended into the expansion joint, so that the rotating drum 402 drives the cleaning brush 403 to rotate rapidly, and the rotating cleaning brush 403 cleans the impurities on the inner wall of the expansion joint to ensure the cleanliness of the inside of the expansion joint. By cleaning the inner wall of the expansion joint, errors can be avoided in subsequent expansion and compression tests, thereby ensuring the accuracy of the test results.

[0041] See also Figure 1 to Figure 2 As shown, a dust collector head is detachably mounted on one end of the feed pipe 503, a filter screen is fixedly mounted inside the connecting pipe 504, and one end of the connecting pipe 504 is fixedly connected to the inside of the air storage box 702. The dust collector head is in direct contact with the expansion joint, so that impurities and dust in the expansion joint can be effectively absorbed. The filter screen is used to filter the impurities and dust sucked in through the feed pipe 503, so as to prevent these impurities from entering the air storage box 702 or other components, thereby keeping the gas clean.

[0042] See also Figure 6 As shown, a spring A608 is provided inside the sleeve 604, and the spring A608 is sleeved on the periphery of the moving rod 606. The use of the spring A608 facilitates the rapid reset of the moving rod 606 after the pressure is released. The gas disk 601 and the gas storage box 702 are fixedly connected through the air supply pipe 610, so that the gas in the gas storage box 702 can enter the interior of the gas disk 601.

[0043] See also Figure 4 As shown, the movable plate 3 and the gas disk 601 are fixedly connected via multiple groups of shock absorbers 609, which are distributed in a linear array along the axis of the movable plate 3. The shock absorbers 609 are used to reduce the vibration caused by mechanical movement or external impact during the expansion joint test.

[0044] See also Figures 1 to 4 As shown, a spring C712 is provided inside the cylinder 707, and the spring C712 is sleeved on the outside of the slide bar 708. The use of the spring C712 facilitates the rapid reset of the slide bar 708 after the pressure is released.

[0045] See also Fig. 9As shown, the early warning mechanism 8 includes an installation box 801, which is fixedly installed on the top of the movable plate 3. The installation box 801 is internally slidably connected with a guide rod 802, one end of the guide rod 802 is fixedly connected with an insulating plate 803, one side of the insulating plate 803 is fixedly installed with a conductive sheet A804, the installation box 801 is internally slidably connected with a conductive sheet B805, and an insulating spring 806 is fixedly installed on the side of the conductive sheet B805 away from the conductive sheet A804.

[0046] See also Figure 6 to Figure 7 As shown, the early warning mechanism 8 also includes a gear 807, which is rotatably installed on the top of the moving plate 3 through a rotating shaft, and the top of the gear 807 is meshed with a rack A808, one end of the rack A808 is fixedly connected to one end of the guide rod 802, and the bottom of the gear 807 is meshed with a rack B809, one end of the rack B809 is fixedly connected to the push plate 607 through a connecting plate. When the push plate 607 moves, the push plate 607 drives the rack B809 to move through the connecting plate, and then the rack B809 drives the gear 807 to rotate, and as the gear 807 rotates, the gear 807 synchronously drives the rack A808 to move , so that the rack A808 drives the guide rod 802 to move synchronously. When the conductive sheet A804 is not in contact with the conductive sheet B805, it indicates that the size of the expansion joint is in a normal state. When the insulating plate 803 drives the conductive sheet A804 to contact with the conductive sheet B805, the circuit is connected to form a closed loop, so that the alarm sounds to alert the staff. The alarm reminds the staff to turn off the power in time, so that the heating block 603 stops heating, thereby avoiding the situation where the rubber strip is torn due to excessive stretching of the expansion joint, thereby avoiding the situation where the rubber strip is torn due to excessive stretching of the expansion joint, and protecting the structural integrity of the expansion joint.

[0047] See also Figure 4 As shown, a pressure detector is provided at the top of the pressure plate 711, and a displacement sensor is provided on one side of the push plate 607, and both the pressure detector and the displacement sensor are electrically connected to the external display. The pressure detector is used to monitor in real time the pressure applied by the pressure plate 711 during the pressure resistance test, and the displacement sensor is provided on one side of the push plate 607 to detect the position change of the push plate 607 during the telescopic test.

[0048] See also Figure 1 to Figure 2 As shown, four sets of universal wheels are fixedly installed at the bottom of the base plate 1, providing the device with the ability to move in different directions. An armrest is fixedly installed on one side of the base plate 1, providing an operator with a stable gripping point.

[0049] Working principle: when in use, the device is moved to the designated position, and the rotary drum 402 is extended into the expansion joint by starting the electric push rod 401, so that the rotary drum 402 drives the cleaning brush 403 to rotate rapidly, and the rotating cleaning brush 403 cleans the impurities on the inner wall of the expansion joint to ensure the cleanliness of the expansion joint. By cleaning the inner wall of the expansion joint, errors can be avoided in subsequent expansion and compression tests, and the accuracy of the test results can be ensured. After the cleaning mechanism 4 cleans the impurities inside the expansion joint, the dust suction fan 502 is started, and the dust suction fan 502 sucks the impurities inside the expansion joint through the feeding pipe 503, and sucks the impurities into the collection box 501 to collect the impurities. At the same time, when the dust suction fan 502 is working, it transports part of the sucked gas to the inside of the gas storage box 702 through the connecting pipe 504 for storage. The gas stored in the gas storage box 702 can be used to assist the expansion and contraction detection mechanism 6, and can also be used for the compression detection mechanism 7, thereby improving the efficiency and resource utilization of the entire test device.

[0050] After the cleaning mechanism 4 cleans out the impurities in the expansion joint, the expansion detection mechanism 6 is lowered and penetrated into the expansion joint by starting the cylinder. When the heating block 603 is lowered to contact the rubber strip inside the expansion joint, the power is turned on to heat the heating block 603, so that the heating block 603 is heated and heats the inside of the expansion joint. As the temperature of the heating block 603 continues to rise, the heated volume of the gas inside the gas disk 601 continues to increase, and the gas enters the inside of the sleeve 604 through the gas pipe, so that the internal pressure increase of the sleeve 604 pushes the piston 605 to drive the moving rod 606 to move, so that the moving rod 606 synchronously drives the push plate 607 to move. As the heating block 603 heats the inside of the expansion joint, the rubber strip is heated and gradually expands, and the gap of the expansion joint changes accordingly. The synchronous movement of the push plate 607 causes the position of the displacement detector to change, and the displacement change detected by the displacement detector is transmitted to the external display. Whether the expansion joint can be normally expanded and contracted when heated is observed through the external display to ensure the normal working performance of the expansion joint;

[0051] In addition, the control valve on the surface of the air delivery pipe 610 can be opened manually, so that the gas inside the air storage box 702 enters the inside of the air disk 601, so that the internal air pressure of the air disk 601 is further increased, so that the force of pushing the push plate 607 is increased, thereby increasing the pressure on the expansion joint detection and improving its detection flexibility;

[0052] As the gas continues to enter, the pressure inside the gas storage box 702 gradually increases. When the pressure inside the gas storage box 702 reaches a certain threshold, the sealing ball 703 is pushed downward by the gas, and the sealing ball 703 moves downward to squeeze the arc plate 706. The arc plate 706 moves downward and contracts under the action of the telescopic rod 704. The gas enters the inside of the gas outlet pipe 701 through the gap between the gas storage box 702 and the sealing ball 703. The gas enters the inside of the cylinder 707 through the gas transmission pipe. As the gas enters, the gas pressure inside the cylinder 707 increases, and the gas pushes the sliding rod 708 to The slide bar 708 moves downward, and the mounting plate 709 moves downward synchronously, and the mounting plate 709 drives the pressure plate 711 to squeeze the surface of the expansion joint. As the push plate 607 continues to move, the air pressure inside the cylinder 707 becomes higher and higher, so that the pressure of the pressure plate 711 on the surface of the expansion joint is continuously increased, so as to realize the detection of the pressure resistance of the expansion joint. By means of gas pressurization, the pressure change of the expansion joint in actual use is simulated, and whether the pressure resistance of the expansion joint meets the requirements can be detected, so as to ensure that the expansion joint can maintain the structural integrity and functionality under different pressures;

[0053] In addition, when the control valve on the surface of the air duct 610 is opened, after the expansion joint is detected, the control valve on the surface of the air duct 610 is manually closed, and the dust suction fan 502 works to deliver the generated gas only to the inside of the air storage box 702 through the connecting pipe 504.

[0054] When the push plate 607 moves, the push plate 607 drives the rack B809 to move through the connecting plate, and then the rack B809 drives the gear 807 to rotate. As the gear 807 rotates, the gear 807 synchronously drives the rack A808 to move, so that the rack A808 drives the guide rod 802 to move synchronously. When the conductive sheet A804 is not in contact with the conductive sheet B805, it indicates that the size of the expansion joint is in a normal state. When the insulating plate 803 drives the conductive sheet A804 to contact the conductive sheet B805, the circuit is connected to form a closed loop, so that the alarm sounds to remind the staff to pay attention. The alarm reminds the staff to turn off the power in time, so that the heating block 603 stops heating, so as to avoid the expansion joint from over-stretching and causing the rubber strip to tear, thereby avoiding the expansion joint from over-stretching and causing the rubber strip to tear, thereby protecting the structural integrity of the expansion joint.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fiber Bragg grating expansion joint testing device for construction engineering, comprising a bottom plate (1), characterized in that: The top of the bottom plate (1) is fixedly connected to a mounting frame (2), the interior of the mounting frame (2) is slidably connected to a moving plate (3), a cleaning mechanism (4) is provided on one side of the bottom plate (1), a recycling mechanism (5) is provided on the top of the mounting frame (2), a telescopic detection mechanism (6) and a pressure resistance detection mechanism (7) are provided inside the mounting frame (2), and an early warning mechanism (8) is provided on the top of the moving plate (3); the recycling mechanism (5) comprises a collection box (501), the collection box (501) is fixedly mounted on the top of the mounting frame (2), and a dust suction fan (501) is fixedly mounted on the top of the collection box (501). 502), one side of the dust suction fan (502) is fixedly connected to a feed pipe (503), and the outer wall of the feed pipe (503) is fixedly connected to a connecting pipe (504); the telescopic detection mechanism (6) comprises an air disk (601), the air disk (601) is arranged below the movable plate (3), a heat-conducting copper tube (602) is fixedly installed at the bottom of the air disk (601), a heating block (603) is fixedly installed at the bottom of the heat-conducting copper tube (602), and both sides of the air disk (601) are fixedly connected to a sleeve (604) through an air delivery pipe, and a piston (605) is slidably connected to the inside of the sleeve (604). , one side of the piston (605) is fixedly connected to a moving rod (606), and one end of the moving rod (606) passing through the outside of the sleeve (604) is fixedly connected to a push plate (607); the pressure resistance detection mechanism (7) comprises an air outlet pipe (701), the air outlet pipe (701) passes through and is fixedly installed on the top of the mounting frame (2), the top of the air outlet pipe (701) is fixedly connected to an air storage box (702), the inside of the air outlet pipe (701) is movably connected to a sealing ball (703), and the inner wall of the air outlet pipe (701) is rotatably mounted with a telescopic rod (704) through a rotating seat, and the outer wall of the telescopic rod (704) is The wall sleeve is provided with a spring B (705), one end of the telescopic rod (704) is fixedly connected to an arc plate (706), the top of the arc plate (706) is movably connected to the sealing ball (703), the bottom of the air outlet pipe (701) is fixedly connected to a cylinder (707) through an air supply pipe, the interior of the cylinder (707) is slidably connected to a slide rod (708), one end of the slide rod (708) passing through the outside of the cylinder (707) is fixedly connected to a mounting plate (709), the bottom of the mounting plate (709) is fixedly connected to a vertical rod (710), and the bottom of the vertical rod (710) is fixedly connected to a pressure plate (711).

2. The fiber grating expansion joint testing device for construction engineering according to claim 1, characterized in that: The cleaning mechanism (4) comprises an electric push rod (401), the electric push rod (401) being fixedly mounted on the bottom end of one side of the base plate (1), a rotating drum (402) being fixedly mounted on the output end of the electric push rod (401), and a cleaning brush (403) being fixedly mounted on the bottom of the rotating drum (402).

3. The fiber Bragg grating expansion joint testing device for construction engineering according to claim 1, characterized in that: A dust collector head is detachably mounted on one end of the feed pipe (503), a filter screen is fixedly mounted inside the connecting pipe (504), and one end of the connecting pipe (504) is fixedly connected to the inside of the air storage box (702).

4. The fiber grating expansion joint testing device for construction engineering according to claim 1, characterized in that: A spring A (608) is disposed inside the sleeve (604), and the spring A (608) is sleeved around the periphery of the moving rod (606). The air disk (601) and the air storage box (702) are fixedly connected via an air delivery pipe (610).

5. The fiber grating expansion joint testing device for construction engineering according to claim 1, characterized in that: The movable plate (3) and the gas disk (601) are fixedly connected via a plurality of groups of shock absorbers (609), and the plurality of groups of shock absorbers (609) are distributed in a linear array along the axial direction of the movable plate (3).

6. The fiber grating expansion joint testing device for construction engineering according to claim 1, characterized in that: A spring C (712) is arranged inside the cylinder (707), and the spring C (712) is sleeved on the outside of the sliding rod (708).

7. The fiber Bragg grating expansion joint testing device for construction engineering according to claim 1, characterized in that: The early warning mechanism (8) comprises an installation box (801), wherein the installation box (801) is fixedly installed on the top of the movable plate (3), a guide rod (802) is slidably connected inside the installation box (801), an insulating plate (803) is fixedly connected to one end of the guide rod (802), a conductive sheet A (804) is fixedly installed on one side of the insulating plate (803), a conductive sheet B (805) is slidably connected inside the installation box (801), and an insulating spring (806) is fixedly installed on the side of the conductive sheet B (805) away from the conductive sheet A (804).

8. The fiber Bragg grating expansion joint testing device for construction engineering according to claim 1, characterized in that: The warning mechanism (8) further comprises a gear (807), wherein the gear (807) is rotatably mounted on the top of the movable plate (3) via a rotating shaft, wherein the top of the gear (807) is meshedly connected with a rack A (808), wherein one end of the rack A (808) is fixedly connected to one end of the guide rod (802), and the bottom of the gear (807) is meshedly connected with a rack B (809), wherein one end of the rack B (809) is fixedly connected to the push plate (607) via a connecting plate.

9. The fiber grating expansion joint testing device for construction engineering according to claim 1, characterized in that: A pressure detector is provided at the top of the pressure plate (711), and a displacement sensor is provided at one side of the push plate (607), and both the pressure detector and the displacement sensor are electrically connected to an external display.

10. The fiber grating expansion joint testing device for construction engineering according to claim 1, characterized in that: Four groups of universal wheels are fixedly mounted on the bottom of the base plate (1), and a handrail frame is fixedly mounted on one side of the base plate (1).

Images