Polyurethane expansion joint freezing resistance testing device based on temperature regulation

Abstract

The invention relates to the field of testing devices, and provides a polyurethane expansion joint freezing resistance testing device based on temperature regulation, which comprises a device body, a refrigeration system is arranged in the device body, the inner wall of a device cavity is fixedly connected with a multi-layer box, a motor and a hand pressure inflator pump, and the multi-layer box is provided with two or more standing cavities. A guide cavity communicated with all the standing cavities is formed in the multi-layer box, one inner wall of the guide cavity is an inclined plane, the inner wall of the standing cavity is slidably connected with an L-shaped push plate, the L-shaped push plate extends out of the standing cavity and is connected with the outer wall of the multi-layer box through a first elastic piece, and a gear is fixedly connected to a rotor of the motor; the inner wall of the device cavity is slidably connected with a force transmission toothed plate, the force transmission toothed plate is fixedly connected with a push cylinder, the bottom wall of a cylinder cavity is fixedly connected with a bearing block, the inner wall of the cylinder cavity is slidably connected with a piston, the piston is fixedly connected with a push rod, and the push cylinder is connected with the outer wall of the multi-layer box through a fourth elastic piece. According to the invention, all polyurethane concrete samples can automatically slide to the top wall of the movable supporting plate one by one for pressure resistance testing.

Description

Technical Field

[0001] The invention relates to the technical field of testing devices, and in particular to a polyurethane expansion joint antifreeze testing device based on temperature regulation. Background Art

[0002] Polyurethane expansion joints are flexible joints used in bridges, roads, and building structures. They are designed to absorb structural displacement or deformation caused by factors such as temperature fluctuations, loads, and earthquakes. Polyurethane concrete, with its excellent elasticity, durability, and aging resistance, has become a key choice for expansion joints.

[0003] Polyurethane concrete is an important material for polyurethane expansion joints. However, when conducting frost resistance tests on polyurethane concrete samples in polyurethane expansion joints, it is currently necessary to manually test each sample one by one, which is rather troublesome and reduces test efficiency. Summary of the Invention

[0004] In response to the above technical problems, the present invention aims to provide a polyurethane expansion joint frost resistance testing device based on temperature regulation. To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A temperature-regulated polyurethane expansion joint antifreeze test device includes a device body, a device cavity is defined on the device body, a refrigeration system is provided in the device body, a multilayer box, a motor, and a hand-pressed air pump are fixedly connected to the inner wall of the device cavity, two or more static chambers are defined on the multilayer box, a guide chamber is defined on the multilayer box that connects all the static chambers, an inner wall of the guide chamber is formed as an inclined surface, an L-shaped push plate is slidably connected to the inner wall of the static chamber, the L-shaped push plate extends outside the static chamber, and is connected to the outer wall of the multilayer box via a first elastic member. A gear is fixed to the rotor of the motor.

[0006] The inner wall of the device cavity is slidably connected to a force transmission toothed plate, which is meshed with a gear. A push cylinder is fixedly connected to the force transmission toothed plate. A cylinder cavity is formed on the push cylinder. A supporting block is fixedly connected to the bottom wall of the cylinder cavity. A piston is slidably connected to the inner wall of the cylinder cavity. A push rod is fixedly connected to the piston. The push cylinder is connected to the outer wall of the multi-layer box through a fourth elastic member.

[0007] An inflation rod is movably connected to the hand-pressure air pump, and the inflation rod is connected to the outer wall of the hand-pressure air pump through a third elastic member. An elastic and retractable air tube is fixedly connected to the hand-pressure air pump, and one end of the elastic and retractable air tube is fixedly connected to the inner wall of the cylinder cavity;

[0008] A pressure test assembly and a movable support plate are provided in the device cavity.

[0009] Preferably, the pressure testing assembly includes a hydraulic cylinder, a hydraulic rod and a test head. The hydraulic cylinder is fixed to the inner wall of the device cavity, the hydraulic rod is movably connected to the hydraulic cylinder, the test head is fixed to the lower end of the hydraulic rod, and a pressure sensor is embedded in the bottom wall of the test head.

[0010] Preferably, the inner wall of the device cavity is fixed with a fixed support plate and an extension plate, the movable support plate is slidably connected to the fixed support plate, the movable support plate is connected by a connecting rod and a sliding rod, the sliding rod is slidably connected to the bottom wall of the device cavity, a transmission plate is fixed on the sliding rod, a plate channel is opened on the transmission plate, the plate channel is inclined, a slide plate is slidably connected to the inner wall of the device cavity, a first permanent magnet is fixed on the slide plate, a linkage cylinder is rotatably connected to the slide plate, the linkage cylinder is slidably connected to the inner wall of the plate channel, the slide plate is connected to the bottom wall of the device cavity through a second elastic member, and the bottom wall of the force transmission tooth plate is inlaid with a second permanent magnet.

[0011] Preferably, the hand-operated air pump is fixedly connected to a deflation valve, the elastically retractable air tube is fixedly connected to the deflation valve, the deflation valve is rotatably connected to a transmission shaft, and one end of the transmission shaft extends to the outside of the device body.

[0012] Preferably, one end of the transmission shaft located outside the device body is fixedly connected to a handle.

[0013] Preferably, an air outlet pipe is fixedly connected to the refrigeration system, and an air supply channel is opened on the multi-layer box. The air supply channel is connected to all the static chambers, and the air supply channel is connected to the air outlet pipe.

[0014] Preferably, an inlet door and an outlet door are movably connected to the device body.

[0015] Preferably, the refrigeration system includes a compressor, a condenser, a throttling device and an evaporator. The compressor is connected to the condenser through a pipeline, the condenser is connected to the throttling device through a pipeline, the throttling device is connected to the evaporator through a pipeline, and the evaporator is connected to the compressor through a pipeline to form a closed-cycle refrigeration circuit.

[0016] Preferably, a temperature sensor is provided in the device cavity.

[0017] Preferably, a processing module is provided in the device body.

[0018] The present invention has the following beneficial effects:

[0019] The present invention can simultaneously place multiple polyurethane concrete samples of different shapes in layers to facilitate low-temperature testing. Driven by a motor, all polyurethane concrete samples can automatically slide one by one to the top wall of the movable support plate for compression resistance testing. The advantage of testing one by one is that it can adapt to samples of different shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0021] Figure 1 This is a schematic structural diagram of a polyurethane expansion joint frost resistance testing device based on temperature regulation according to the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of a polyurethane expansion joint antifreeze testing device based on temperature regulation according to the present invention;

[0023] Figure 3 This invention Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This invention Figure 3 Schematic diagram of the structure of the middle transmission plate and linkage cylinder.

[0025] Reference numerals: 1, device body; 2, device chamber; 3, hydraulic cylinder; 4, hydraulic rod; 5, test head; 6, air outlet duct; 7, multi-layer box; 8, static chamber; 9, guide chamber; 10, inclined plane; 11, air supply channel; 12, L-shaped push plate; 13, first elastic member; 14, fixed support plate; 15, extension plate; 16, movable support plate; 17, connecting rod; 18, sliding rod; 19, transmission plate; 20, plate channel; 21, slide plate; 22, first permanent magnet; 23. Linkage cylinder; 24. Second elastic member; 25. Motor; 26. Gear; 27. Power transmission gear plate; 28. Second permanent magnet; 29. Hand-operated air pump; 30. Inflating rod; 31. Third elastic member; 32. Air release valve; 33. Elastic and retractable air tube; 34. Transmission shaft; 35. Turning handle; 36. Push cylinder; 37. Cylinder cavity; 38. Support block; 39. Piston; 40. Push rod; 41. Fourth elastic member; 42. Inlet door; 43. Outlet door. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] like Figures 1-4 As shown, a polyurethane expansion joint antifreeze test device based on temperature regulation includes a device body 1, a device cavity 2 is defined on the device body 1, a refrigeration system is provided in the device body 1, a multilayer box 7, a motor 25, and a hand-pressure air pump 29 are fixedly connected to the inner wall of the device cavity 2, two or more static chambers 8 are defined on the multilayer box 7, a guide chamber 9 is defined on the multilayer box 7 to connect all the static chambers 8, an inner wall of the guide chamber 9 is a slope 10, an L-shaped push plate 12 is slidably connected to the inner wall of the static chamber 8, the L-shaped push plate 12 extends to the outside of the static chamber 8, the L-shaped push plate 12 is connected to the outer wall of the multilayer box 7 through a first elastic member 13, and a gear 26 is fixed to the rotor of the motor 25;

[0030] A force transmission toothed plate 27 is slidably connected to the inner wall of the device chamber 2. The force transmission toothed plate 27 meshes with the gear 26. A push cylinder 36 is fixedly connected to the force transmission toothed plate 27. The push cylinder 36 defines a cylinder cavity 37. A support block 38 is fixedly connected to the bottom wall of the cylinder cavity 37. A piston 39 is slidably connected to the inner wall of the cylinder cavity 37. A push rod 40 is fixedly connected to the piston 39. The push cylinder 36 is connected to the outer wall of the multi-layer box 7 via a fourth elastic member 41.

[0031] The hand-operated air pump 29 is movably connected to an inflating rod 30, which is connected to the outer wall of the hand-operated air pump 29 via a third elastic member 31. An elastic and retractable air tube 33 is fixed to the hand-operated air pump 29, and one end of the elastic and retractable air tube 33 is fixed to the inner wall of the cylinder cavity 37.

[0032] A pressure testing assembly and a movable support plate 16 are provided in the device cavity 2 .

[0033] The internal structure of the hand-pressure air pump 29 can refer to the internal structure of the hand-pressure air pump used for bicycles. The pressure testing component is used to perform pressure resistance testing on polyurethane concrete samples. The refrigeration system can achieve temperature regulation of the device chamber 2 and the static chamber 8 by controlling the operating status of the refrigeration system.

[0034] According to an optional embodiment of the present invention, the pressure testing assembly includes a hydraulic cylinder 3, a hydraulic rod 4, and a test head 5. The hydraulic cylinder 3 is fixedly connected to the inner wall of the device chamber 2, the hydraulic rod 4 is movably connected to the hydraulic cylinder 3, and the test head 5 is fixedly connected to the lower end of the hydraulic rod 4. The bottom wall of the test head 5 is embedded with a pressure sensor. The core principle of the pressure sensor is to convert mechanical pressure signals into electrical signals, so that the user can determine the pressure applied by the test head 5 to the sample.

[0035] According to an optional embodiment of the present invention, the inner wall of the device cavity 2 is fixed with a fixed support plate 14 and an extension plate 15, the movable support plate 16 is slidably connected to the fixed support plate 14, the movable support plate 16 is connected through a connecting rod 17 and a sliding rod 18, the sliding rod 18 is slidably connected to the bottom wall of the device cavity 2, a transmission plate 19 is fixed on the sliding rod 18, a plate channel 20 is opened on the transmission plate 19, the plate channel 20 is tilted, the inner wall of the device cavity 2 is slidably connected with a slide plate 21, a first permanent magnet 22 is fixed on the slide plate 21, a linkage cylinder 23 is rotatably connected to the slide plate 21, the linkage cylinder 23 is slidably connected to the inner wall of the plate channel 20, the slide plate 21 is connected to the bottom wall of the device cavity 2 through a second elastic member 24, and the bottom wall of the force transmission tooth plate 27 is inlaid with a second permanent magnet 28.

[0036] Then the linkage cylinder 23 slides in the plate channel 20, so that the transmission plate 19 can be moved up and down.

[0037] According to an optional embodiment of the present invention, the hand-operated air pump 29 is fixedly connected to a deflation valve 32, the elastically retractable air tube 33 is fixedly connected to the deflation valve 32, and the deflation valve 32 is rotatably connected to a transmission shaft 34, one end of the transmission shaft 34 extends to the outside of the device body 1.

[0038] According to an optional embodiment of the present invention, one end of the transmission shaft 34 located outside the device body 1 is fixedly connected to a turning handle 35 .

[0039] According to an optional embodiment of the present invention, an air outlet pipe 6 is fixedly connected to the refrigeration system, and an air supply channel 11 is opened on the multi-layer box 7. The air supply channel 11 connects all the static chambers 8, and the air supply channel 11 is connected to the air outlet pipe 6.

[0040] According to an optional embodiment of the present invention, the device body 1 is movably connected with an inlet door 42 and an outlet door 43. The inlet door 42 and the outlet door 43 can be connected to the device body 1 by sliding or rotating.

[0041] According to an optional embodiment of the present invention, the refrigeration system includes a compressor, a condenser, a throttling device, and an evaporator. The compressor is connected to the condenser via a pipeline, the condenser is connected to the throttling device via a pipeline, the throttling device is connected to the evaporator via a pipeline, and the evaporator is connected to the compressor via a pipeline, forming a closed-loop refrigeration circuit. The evaporator is connected to the air outlet pipe 6.

[0042] According to an optional embodiment of the present invention, a temperature sensor is provided in the device cavity 2. The temperature sensor can obtain the temperature condition in the device cavity 2.

[0043] According to an optional embodiment of the present invention, a processing module is provided in the device body 1. The processing module is used to control the operation of various components and process data.

[0044] Working principle:

[0045] In the initial state, the push cylinder 36 and the inflation rod 30 are in contact with each other, the deflation valve 32 is in a closed state, and the second permanent magnet 28 is located directly above the first permanent magnet 22 .

[0046] The polyurethane concrete to be used in the polyurethane expansion joint is sampled to obtain multiple polyurethane concrete samples. The inlet door 42 is opened to place the samples in each static chamber 8 respectively, and a static chamber 8 can place at most one sample. The inlet door 42 is closed, and the refrigeration system is turned on. Cold air is blown from the air outlet pipe 6 to the air supply channel 11. The cold air is transmitted through the air supply channel 11 to each static chamber 8, so that all samples are in a low-temperature environment.

[0047] After a period of time, the motor 25 is turned on, and the rotor of the motor 25 drives the gear 26 to rotate. The gear 26 drives the transmission gear plate 27 and the push cylinder 36 to move right, and the second permanent magnet 28 moves to the right of the first permanent magnet 22. The first permanent magnet 22 moves upward after losing the magnetic repulsion of the second permanent magnet 28, and the linkage cylinder 23 slides on the inner wall of the plate channel 20, thereby driving the transmission plate 19, the slide rod 18, the connecting rod 17, and the movable support plate 16 to move left to a position where the sample can be received. The push cylinder 36 pushes the lowest L-shaped push plate 12 to overcome the The first elastic member 13 moves rightward by elastic force, and the L-shaped push plate 12 pushes the sample in the lowest static chamber 8 to the right. The sample slides along the inclined surface 10 to the top wall of the movable support plate 16. The inclined surface 10 can prevent the sample from falling directly and being damaged. The force transmission tooth plate 27 continues to move rightward, and the force transmission tooth plate 27 pushes the sample to the right to the bottom of the test head 5. The motor 25 stops running, the hydraulic cylinder 3 is turned on, and the hydraulic rod 4 is extended so that the test head 5 can perform a pressure resistance test on the sample. The pressure sensor can obtain pressure data in real time so that the user can know the test result. In this case, the hydraulic rod 4 is shortened, the motor 25 is reversed, and the force transmission gear plate 27 is driven to move left and reset. After the second permanent magnet 28 moves to the top of the first permanent magnet 22, the first permanent magnet 22 moves downward under the magnetic repulsion of the second permanent magnet 28, and the linkage cylinder 23 drives the transmission plate 19 and the movable support plate 16 to move right. The sample and the extension plate 15 are offset. As the movable support plate 16 moves right, the sample loses the support of the movable support plate 16 and falls to the bottom wall of the device chamber 2, so that the user can open the outlet door 43 to take out the sample for subsequent processing. During operation, the push cylinder 36 pushes the inflation rod 30 to overcome the elastic force of the third elastic member 31 and move it to the left, so that the hand-pressure inflation pump 29 inflates the cylinder cavity 37 through the elastic retractable air tube 33. The gas pushes the piston 39 and the push rod 40 to move upward, and the motor 25 is reversed again, and the force transmission gear plate 27 moves to the right. Since the push rod 40 moves upward, the push rod 40 will drive the upper L-shaped push plate 12 to move to the right together. Through the above principle, the pressure resistance test of the upper sample can be carried out, and this is repeated to carry out pressure resistance test on each sample one by one.

[0048] The sample is placed in a set low temperature environment for a period of time, and then the pressure data and sample damage degree obtained through the compression test can be used to know the anti-freeze performance of the polyurethane expansion joint.

[0049] After the test is completed, the push rod 40 needs to be reset. The turning handle 35 can open the air release valve 32, thereby releasing the gas below the piston 39 in the cylinder cavity 37. The piston 39 moves downward under the action of its own gravity until it contacts the support block 38, and the push rod 40 is reset to facilitate the next test.

[0050] The present invention can simultaneously place multiple polyurethane concrete samples of different shapes in layers to facilitate low-temperature testing. Driven by motor 25, all polyurethane concrete samples can be automatically slid one by one onto the top wall of the movable support plate 16 for compression testing. The advantage of testing one sample at a time is that it can accommodate samples of different shapes. After the compression test of a sample is completed, the sample can be automatically removed from the top wall of the movable support plate 16 to avoid interfering with the compression test of the next sample. The present invention has a high degree of automation and strong linkage, thereby improving the efficiency of frost resistance testing of polyurethane expansion joints.

[0051] The components, modules, mechanisms and devices not described in detail in the present invention are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polyurethane expansion joint frost resistance test device based on temperature regulation, characterized in that: The invention comprises a device body (1), a device cavity (2) is provided on the device body (1), a refrigeration system is provided in the device body (1), a multilayer box (7), a motor (25) and a hand-pressed air pump (29) are fixedly connected to the inner wall of the device cavity (2), two or more static chambers (8) are provided on the multilayer box (7), a guide chamber (9) communicating with all the static chambers (8) is provided on the multilayer box (7), an inner wall of the guide chamber (9) is an inclined surface (10), an L-shaped push plate (12) is slidably connected to the inner wall of the static chamber (8), the L-shaped push plate (12) extends to the outside of the static chamber (8), the L-shaped push plate (12) is connected to the outer wall of the multilayer box (7) through a first elastic member (13), and a gear (26) is fixedly connected to the rotor of the motor (25); The inner wall of the device cavity (2) is slidably connected to a force transmission tooth plate (27), the force transmission tooth plate (27) and the gear (26) are meshed, a push cylinder (36) is fixedly connected to the force transmission tooth plate (27), a cylinder cavity (37) is opened on the push cylinder (36), a supporting block (38) is fixedly connected to the bottom wall of the cylinder cavity (37), a piston (39) is slidably connected to the inner wall of the cylinder cavity (37), a push rod (40) is fixedly connected to the piston (39), and the push cylinder (36) is connected to the outer wall of the multi-layer box (7) through a fourth elastic member (41); An inflation rod (30) is movably connected to the hand-pressed air pump (29), and the inflation rod (30) is connected to the outer wall of the hand-pressed air pump (29) through a third elastic member (31). An elastic and retractable air tube (33) is fixed to the hand-pressed air pump (29), and one end of the elastic and retractable air tube (33) is fixed to the inner wall of the cylinder cavity (37); A pressure test assembly and a movable support plate (16) are provided in the device cavity (2).

2. The temperature-regulated polyurethane expansion joint frost resistance testing device according to claim 1, characterized in that: The pressure test assembly comprises a hydraulic cylinder (3), a hydraulic rod (4) and a test head (5); the hydraulic cylinder (3) is fixedly connected to the inner wall of the device cavity (2); the hydraulic rod (4) is movably connected to the hydraulic cylinder (3); the test head (5) is fixedly connected to the lower end of the hydraulic rod (4); and a pressure sensor is embedded in the bottom wall of the test head (5).

3. The temperature-regulated polyurethane expansion joint frost resistance testing device according to claim 2, characterized in that: The inner wall of the device cavity (2) is fixedly connected with a fixed support plate (14) and an extension plate (15); the movable support plate (16) is slidably connected to the fixed support plate (14); the movable support plate (16) is connected to the fixed support plate (14) through a connecting rod (17) and a sliding rod (18); the sliding rod (18) is slidably connected to the bottom wall of the device cavity (2); a transmission plate (19) is fixedly connected to the sliding rod (18); a plate channel (20) is provided on the transmission plate (19); the plate channel (20) is tilted; a slide plate (21) is slidably connected to the inner wall of the device cavity (2); a first permanent magnet (22) is fixedly connected to the slide plate (21); a linkage cylinder (23) is rotatably connected to the slide plate (21); the linkage cylinder (23) is slidably connected to the inner wall of the plate channel (20); the slide plate (21) is connected to the bottom wall of the device cavity (2) through a second elastic member (24); and a second permanent magnet (28) is embedded in the bottom wall of the force transmission tooth plate (27).

4. The temperature-regulated polyurethane expansion joint frost resistance testing device according to claim 3, characterized in that: The hand-operated air pump (29) is fixedly connected to a deflation valve (32), the elastically retractable air tube (33) is fixedly connected to the deflation valve (32), and the deflation valve (32) is rotatably connected to a transmission shaft (34), one end of which extends to the outside of the device body (1).

5. The temperature-regulated polyurethane expansion joint frost resistance testing device according to claim 4, characterized in that: The transmission shaft (34) is located outside the device body (1), and one end thereof is fixedly connected to a turning handle (35).

6. The temperature-regulated polyurethane expansion joint frost resistance testing device according to claim 5, characterized in that: An air outlet pipe (6) is fixedly connected to the refrigeration system, and an air supply channel (11) is provided on the multi-layer box (7). The air supply channel (11) is connected to all the static chambers (8), and the air supply channel (11) is connected to the air outlet pipe (6).

7. The temperature-regulated polyurethane expansion joint frost resistance testing device according to claim 6, characterized in that: An inlet door (42) and an outlet door (43) are movably connected to the device body (1).

8. A temperature-regulated polyurethane expansion joint frost resistance testing device according to any one of claims 1 to 7, characterized in that: The refrigeration system includes a compressor, a condenser, a throttling device and an evaporator. The compressor is connected to the condenser through a pipeline, the condenser is connected to the throttling device through a pipeline, the throttling device is connected to the evaporator through a pipeline, and the evaporator is connected to the compressor through a pipeline to form a closed cycle refrigeration circuit.

9. The temperature-regulated polyurethane expansion joint frost resistance testing device according to claim 8, characterized in that: A temperature sensor is provided in the device cavity (2).

10. The temperature-regulated polyurethane expansion joint antifreeze testing device according to claim 9, characterized in that: A processing module is provided in the device body (1).

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