A concrete salt-frost testing device for a seasonal freeze zone

Abstract

The utility model discloses a kind of concrete salt freeze testing equipment in seasonal frost region, belong to concrete salt freeze cycle testing equipment technical field. Including: the top of bottom chamfer plate is rotationally connected top chamfer plate, rotation component is connected on the bottom chamfer plate and drives top chamfer plate to rotate;Vertical moving component drives top plate to move up and down, and top plate is connected in vertical sliding with top chamfer plate;Horizontal moving component drives a pair of clamping plates to be close to each other or away from each other, and the top wall of high-low temperature alternation box is provided with opening and fixed in the top surface right side of bottom plate, and top plate can close opening;First through slot is opened in bottom chamfer plate, and mixing box is fixed on the groove bottom of first through slot;Spraying device is fixed on the left side of bottom chamfer plate;Liquid pump inputs the salt solution after mixing in mixing box to spraying device, and spraying device sprays salt solution to the object to be detected after freezing. Solve the problem that traditional soaking method test accuracy is low and cannot simulate real environment change. Increase the change of salt solution concentration, improve test precision.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete salt-freezing cycle testing equipment, and in particular to a concrete salt-freezing testing equipment for seasonally frozen areas. Background Technology

[0002] In today's rapidly developing construction industry, concrete is widely used in engineering projects. However, for a long time, people have mistakenly believed that concrete is a durable building material. This misconception often leads to insufficient durability of concrete structures, causing premature engineering defects in concrete buildings. This not only threatens life safety and affects the service life of buildings, but also results in huge repair and reinforcement costs, causing serious economic losses. In today's rapidly developing infrastructure industry, neglecting the durability of concrete can easily lead to serious losses. For example, a durability survey of concrete structures along the Zhejiang coast conducted by the Hangzhou Bay Bridge project department found that more than 80% of the concrete structures had varying degrees of steel reinforcement corrosion. In particular, the area where the Hangzhou Bay Bridge is located has harsh climate conditions and frequent typhoons, causing severe erosion and corrosion of bridge piers and other parts, leading to concrete spalling and steel reinforcement corrosion. Therefore, researchers at home and abroad have conducted in-depth research on the durability of concrete.

[0003] Common cyclic testing typically employs the immersion method. The specific procedure involves immersing the concrete test block in an open container filled with a solution of a specific salt concentration. The container is then placed in a high-low temperature alternating test chamber (which controls the output of heat and cold sources to rapidly raise or lower the internal temperature to the desired range. Typically, a high-low temperature alternating test chamber consists of a control system, a cold source, and a heat source; the control system monitors and regulates the temperature, while the heat and cold sources rapidly raise or lower the temperature, such as the GDW-010L high-low temperature alternating test chamber). After multiple freeze-thaw cycles, the data changes are recorded each time, and the salt-freezing resistance of the concrete is evaluated by analyzing the gradient changes in the data. However, this testing method has the following problems:

[0004] 1. Due to repeated tests over a long period of time, the water in the solution will evaporate, causing the salt concentration to increase, which will reduce the accuracy of the test.

[0005] 2. With a fixed solution concentration, it is difficult to simulate changes in salt concentration in the actual environment.

[0006] Therefore, we propose a concrete salt freezing test device for seasonally frozen areas to solve the above problems. Utility Model Content

[0007] To address the lack of a solution in existing technologies to reduce the accuracy of immersion testing and prevent the simulation of real-world environmental changes, the present invention aims to provide a concrete salt-freezing testing device for seasonally frozen regions. To achieve the above objective, the present invention provides the following technical solution:

[0008] A concrete salt-freezing test device for frost-prone areas includes:

[0009] Base plate, bottom chamfer plate, top chamfer plate, top plate, a pair of clamping plates, high and low temperature alternating chamber, mixing tank for providing brine, spraying device, and liquid pump;

[0010] The bottom chamfer plate is fixedly connected to the top of the base plate;

[0011] The top of the bottom chamfer plate is rotatably connected to the top chamfer plate, and the rotating component connected to the bottom chamfer plate drives the top chamfer plate to rotate;

[0012] A vertical moving component is connected to the top chamfer plate, which drives the top plate to move up and down, and the top plate and the top chamfer plate are vertically slidably connected.

[0013] A horizontal moving component is connected to the top plate. The horizontal moving component drives a pair of clamping plates to move closer or further apart from each other. The clamping plates are used to clamp the object to be tested.

[0014] The top wall of the high and low temperature alternating chamber has an opening and is fixed to the right side of the top surface of the bottom plate. The top plate can close the opening.

[0015] The bottom chamfered plate has a first through groove, and the mixing box is fixed on the bottom of the first through groove;

[0016] The spraying device is fixed to the left side of the bottom chamfered plate;

[0017] The spraying device's inlet, the liquid pump, and the bottom of the mixing tank are connected in sequence. The liquid pump inputs the salt solution stirred in the mixing tank into the spraying device, and the spraying device sprays the salt solution onto the object to be tested.

[0018] Furthermore, the top of the mixing tank is connected to a salt tank, and the top wall of the mixing tank is provided with a through hole. The mixing tank is connected to the salt tank through the through hole, and a valve that can change the flow rate is provided on the through hole.

[0019] Furthermore, the rotating component includes a third motor and a built-in slot;

[0020] The bottom chamfered plate has an internal groove, and a third motor is fixedly connected to the bottom of the inner wall of the internal groove. The bottom of the top chamfered plate has a rotating shaft, and the third motor drives the rotating shaft to rotate.

[0021] Furthermore, the vertical moving component includes a vertical lead screw, a sliding plate, and a vertical guide column;

[0022] The top chamfer plate is internally rotatably connected to a lead screw, and a sliding plate is fixedly connected to the left side of the top plate. The sliding plate is threaded onto the outside of the lead screw. An extension plate is fixedly connected to the left side of the sliding plate. The top chamfer plate is fixedly connected to a guide post, and the extension plate is slidably connected to the outside of the guide post. A second motor that drives the lead screw to rotate is fixedly connected to the top of the top chamfer plate.

[0023] Furthermore, the horizontal moving component includes a bidirectional threaded rod, two trapezoidal plates, and a fourth motor;

[0024] The top plate is rotatably connected to both ends of the bidirectional threaded rod, and the top of each of the two clamping plates is fixedly connected to the trapezoidal plate. The two trapezoidal plates are threaded onto the outside of both ends of the bidirectional threaded rod, and a fourth motor for driving the bidirectional threaded rod to rotate is fixedly connected to the right side of the top plate.

[0025] Furthermore, a stirring rod is rotatably mounted inside the mixing tank, and a first motor is fixedly mounted on the top of the mixing tank, with the output end of the first motor connected to the top of the stirring rod.

[0026] Furthermore, a connecting rod is rotatably mounted on the top wall of the mixing tank. A butterfly valve plate, which serves as a valve, is fixedly connected to the left side of the connecting rod and is placed inside the through hole. A knob is fixedly connected to the right side of the connecting rod. The connecting rod is rotatably connected to the inner wall of the mixing tank, and the knob is located on the outside of the mixing tank.

[0027] A locking plate is horizontally slidably connected inside the knob. Multiple limiting grooves are provided on the right side of the mixing tank. The multiple limiting grooves are evenly distributed around the circumference of the connecting rod axis. The locking plate can be selectively inserted into a certain limiting groove. A pull ring located on the outer surface of the knob is fixed on the right side of the locking plate.

[0028] Furthermore, the knob is provided with a horizontal groove, and a horizontal plate is horizontally slidably connected in the horizontal groove. A pull ring is fixedly connected to the right side of the horizontal plate, and a locking plate is fixedly connected to the left side of the pull ring. A first spring is fixedly connected to the left side of the horizontal plate, and the left end of the first spring is fixedly connected to the left side of the inner wall of the horizontal groove.

[0029] Furthermore, the bottom of the mixing tank is connected to a conveying pipe, which is connected to a water pump that pumps external water into the mixing tank; the bottom of the mixing tank is equipped with a valve to open or close the conveying pipe.

[0030] Furthermore, the spraying device is a spraying plate, which is a hollow cavity. Multiple spraying holes are provided on the left side of the spraying plate, and an input port is provided on the right side of the spraying plate.

[0031] The above technical solution provides the following beneficial effects of a concrete salt-freezing testing device for frost-prone areas:

[0032] (1) In this utility model, after weighing and recording the object to be tested, the object to be tested is placed on one side of the two clamping plates that are close to each other, and then the object to be tested is clamped by the horizontal moving part. The vertical moving part drives the top plate to start moving downward, thereby bringing the object to be tested into the interior of the high and low temperature alternating chamber to start freezing. After freezing is completed, the heating function is started to heat the concrete block and the object to be tested. After heating for a certain period of time, the vertical moving part is started again to move the object to be tested upward from the interior of the high and low temperature alternating chamber, and the rotating part is started to drive the top chamfer plate to start rotating, thereby rotating the frozen object to the left side of the bottom chamfer plate. Move the frozen object to be tested to the left side of the spray plate. Start the water pump to pump water from an external water source into the mixing tank, or manually add water and salt or a salt solution of known concentration into the mixing tank. The mixing tank will thoroughly stir the internal mixture. Then, start the pump to pump all the thoroughly stirred salt solution into the spray plate and spray it onto the surface of the object. Let it stand for a period of time to allow the salt solution on the surface to fully react with the frozen object. This completes one experiment.

[0033] By conducting multiple freeze-thaw cycles and recording the weight changes each time, the salt resistance index of concrete was finally evaluated by analyzing the gradient changes in the data. This novel salt solution is stored in an independent mixing tank and applied to the concrete by spraying. The advantage is that the concentration of the salt solution can be kept constant with each spray, resulting in higher test accuracy and solving the problem of increased salt concentration that often occurs with traditional soaking methods.

[0034] (2) The present invention provides a concrete salt-freezing cycle testing device for seasonally frozen areas. When it is necessary to simulate the testing conditions of objects after freezing and thawing under different salt concentrations, the concentration of the salt solution input into the mixing tank is manually adjusted, and the above operation is repeated to complete a single experiment. After multiple tests, the object to be tested is removed and re-weighed for comparison. Compared with the traditional soaking method, the present invention is more convenient to adjust the test environment with different salt concentrations and temperatures to simulate changes in external conditions in the real environment, and solves the problem that the traditional soaking method is not convenient to adjust the salt solution concentration. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0036] Figure 1 This is a three-dimensional structural diagram of a concrete salt freezing test device for seasonally frozen areas proposed in this utility model.

[0037] Figure 2 This is a cross-sectional structural schematic diagram of a concrete salt-freezing test device for seasonally frozen areas proposed in this utility model.

[0038] Figure 3 This utility model provides a three-dimensional structural diagram of a concrete salt-freezing test equipment for seasonally frozen areas, including a spraying device, a mixing tank, and a mixing rod.

[0039] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0040] Figure 5 for Figure 3 A magnified view of part B in the middle section;

[0041] Figure 6 for Figure 3 A magnified view of part C in the middle.

[0042] In the diagram: 1. Base plate; 2. Bottom chamfer plate; 3. Top chamfer plate; 4. Top plate; 5. Clamping plate; 6. High and low temperature alternating chamber; 7. First through slot; 8. Mixing tank; 9. Spraying device; 10. First through pipe; 11. Salt granule box; 12. Through hole; 13. Connecting rod; 14. Butterfly valve plate; 15. Knob; 16. Clamping plate; 17. Limiting slot; 18. Horizontal slot; 19. Horizontal plate; 20. Pull ring; 21. First spring; 22. Mixing rod; 23. 24. Liquid pump; 25. First motor; 26. Circular groove; 27. Second spring; 28. Sealing gasket; 29. ​​Delivery pipe; 30. Water pump; 31. Lead screw; 32. Sliding plate; 33. Extension plate; 34. Side plate; 35. Guide column; 36. First motor; 37. Internal groove; 38. Third motor; 39. Bidirectional threaded rod; 40. Trapezoidal plate; 41. Fourth motor; 42. Second through groove; 43. Spray hole; 44. Second through pipe. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0044] It should be noted that the terms "above," "one end," "up," etc. used in this document indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Similar expressions are only for illustrative purposes and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "part," "two parts," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] A concrete salt-freezing testing device for seasonally frozen regions includes: a base plate 1, a bottom chamfered plate 2, a top chamfered plate 3, a top plate 4, a pair of clamping plates 5, a high-low temperature alternating chamber 6, a mixing tank for providing salt solution 8, a spraying device 9, and a liquid pump 23. The pair of clamping plates 5 are liftable and rotatable around the top chamfered plate 3, which is a hollow cylindrical structure.

[0046] The bottom chamfer plate 2 is fixedly connected to the top of the base plate 1; the top of the bottom chamfer plate 2 is rotatably connected to the top chamfer plate 3, and the rotating component connected to the bottom chamfer plate 2 drives the top chamfer plate 3 to rotate. The rotation axis of the top chamfer plate 3 is vertical.

[0047] A vertical moving component is connected to the top chamfer plate 3. The vertical moving component drives the top plate 4 to move up and down, and the top plate 4 and the top chamfer plate 3 are vertically slidably connected.

[0048] The top plate 4 is horizontally arranged in the left-right direction and is connected to a horizontal moving component. The horizontal moving component drives a pair of clamping plates 5 to move closer or further apart. The clamping plates 5 are used to clamp the object to be inspected. The pair of clamping plates 5 are slidably connected to the top plate 4 in the horizontal direction. The top ends of the clamping plates are connected to the horizontal moving component, and the bottom ends of the clamping plates are the clamping parts. The shapes of the opposing inner wall surfaces of the two clamping parts match the outer surface of the object to be inspected. Generally, the object to be inspected is a rectangular or prism-shaped block, and the clamping parts are flat. The inner wall surface of the clamping parts can also be provided with an anti-slip layer to increase the friction between the clamping parts and the object to be inspected.

[0049] The high and low temperature alternating chamber 6 has an opening on its top wall, which is fixed to the right side of the top surface of the base plate 1. The top plate 4 can close the opening. The high and low temperature alternating chamber 6 is located to the right of the bottom chamfered plate 2. The top of the high and low temperature alternating chamber 6 has an opening with a sealing strip around its edge. The top plate 4 acts as a cover for the opening, and can be directly closed after concrete is placed inside. The high and low temperature alternating chamber 6 is equipped with a refrigeration system and a heating system, the principle of which is the same as that of existing high and low temperature alternating test chambers, such as the GDW-010L type high and low temperature alternating test chamber. Vertical moving parts allow the top plate 4 to be raised and lowered, thereby allowing entry into and exit from the high and low temperature alternating chamber 6.

[0050] The bottom chamfered plate 2 has a first through groove 7, and the mixing box is fixed on the bottom of the first through groove 7; the bottom chamfered plate 6 also has a first through groove 7, which runs through the front and back, and the mixing box 8 is fixed on the bottom of the first through groove 7. The bottom chamfered plate 2 has a space below the first through groove 7 to accommodate the liquid pump 23. The first through groove 7 is located in the middle of the bottom chamfered plate 2.

[0051] The function of the mixing tank 8 is to mix salt and water. The mixing tank is equipped with an inlet that can be opened and closed, and salt or water can be added through the inlet.

[0052] In a preferred embodiment, a stirring rod 22 is rotatably mounted inside the mixing tank, and a first motor 24 is fixedly mounted on the top of the mixing tank 8, with the output end of the first motor 24 connected to the top end of the stirring rod 22.

[0053] The spraying device 9 is fixed to the left side of the bottom chamfered plate 2. The inlet of the spraying device 9, the liquid pump 23, and the bottom of the mixing tank 8 are connected in sequence. The liquid pump 23 can input all the salt solution after mixing in the mixing tank 8 into the spraying device 9, and the spraying device 9 sprays the salt solution onto the object to be tested. The spraying device 9 is fixed to the left side of the bottom chamfered plate to receive the mixed salt solution and spray it onto the object to be tested. The bottom plate of the mixing tank 8 and the bottom of the first through groove 7 are provided with a first through hole 10. A pipe connecting the bottom of the mixing tank 8 and the liquid pump 23 is provided in the first through hole 10.

[0054] The bottom chamfered plate 2 is also provided with a second through groove 41, which is located below the first through groove 7; the liquid pump 23 and the water pump 29 are both placed in the second through groove 42.

[0055] Furthermore, the liquid pump 23 is a centrifugal pump.

[0056] In a preferred embodiment, to increase the spraying area, the spraying device 9 is a spraying plate, which is a hollow cavity, preferably a cuboid cavity. Multiple spray holes 42 are provided on the left side of the spraying plate, and an input port that is sealed to the bottom chamfered plate 2 is provided on the right side. Through holes are provided on the left side wall of the bottom chamfered plate 2. A sealing ring is used to seal the input hole to the left side wall of the bottom chamfered plate 2. The through holes are used to house a second pipe 43 that connects the input hole and the liquid pump 23.

[0057] The first pipe 10 passes through the bottom of the mixing tank 8 and the bottom of the first channel 7. The top end of the first pipe 10 is connected to the mixing tank 8, and the bottom end of the first pipe 10 is connected to the input end of the pump 23. The spray plate 9 is provided with a cavity. Multiple evenly distributed spray holes 42 are opened on the left side wall of the spray plate 9. The pump 23 transports the liquid in the mixing tank 8 to the spray plate 9 through the first pipe 10. Under pressure, the liquid is sprayed out from the spray holes 42 to achieve spraying on the surface of the concrete block.

[0058] In a preferred embodiment, the top of the mixing tank 8 is connected to the salt tank 11, and the top wall of the mixing tank 8 is provided with a through hole 12. The mixing tank is connected to the salt tank 11 through the through hole 12, and a valve that can change the flow rate is provided on the through hole 12. The valve is preferably a manually operated butterfly valve or a flow valve controlled by a controller, or a preferred embodiment described later.

[0059] The salt box 11 is a box structure with an internal storage space. The top of the salt box 11 is provided with an inlet and the bottom of the salt box 11 is provided with an outlet, which is connected to the through hole 12. The outlet is located at the center of the bottom of the salt box 11. The bottom surface of the salt box 11 is inclined to the horizontal plane, and the horizontal height of the bottom surface gradually decreases from the edge to the outlet position to facilitate the flow of salt particles in the salt box 11.

[0060] Although salt granules can be directly added through the inlet of the mixing tank 8, there is a lack of storage space for salt products. The salt granule tank 11 provides an independent and stable storage space for salt products. A valve allows the salt products to slowly flow into the mixing tank, resulting in better mixing. It can achieve a continuous supply of salt products based on its own storage capacity, significantly improving the continuity and convenience of experimental operations. In addition, high-concentration solutions can be added to the salt granule tank 11 and diluted with water from the mixing tank.

[0061] To reduce the labor intensity of manually adding water directly to the inlet of the mixing tank 8, in a preferred embodiment, a delivery pipe 28 is connected to the bottom of the mixing tank, and the delivery pipe 28 is connected to a water pump 29, which pumps external water to the mixing tank; a valve is provided at the bottom of the mixing tank to open or close the delivery pipe. Water input is achieved through the water pump.

[0062] Optionally, a solenoid valve is provided at the outlet of the salt tank 11, and the solenoid valve is controlled by a controller to open or close the salt tank 11.

[0063] The valve can be selected from existing one-way valves, electric regulating valves, or the following preferred embodiments:

[0064] Preferably, the one-way valve includes a sealing gasket 27 and a second spring 26.

[0065] The bottom plate of the mixing tank 8 has a circular groove 25 on its top surface and a through hole with a diameter smaller than that of the circular groove 25 on its bottom surface. The through hole is for connecting the conveying pipe 28. A sealing gasket is connected to the bottom of the inner wall of the mixing tank. A second spring is fixedly connected to the bottom of the sealing gasket, and the bottom end of the second spring is fixedly connected to the circular groove.

[0066] A circular groove 25 is provided at the bottom of the inner wall of the mixing tank 8. A second spring 26 is connected to the bottom of the inner wall of the circular groove 25. A sealing gasket 27 is fixedly connected to the top of the second spring 26. The sealing gasket 27 is used to open and close the top opening of the circular groove 25. A conveying pipe 28 is connected to the bottom of the circular groove. A water pump 29 is connected to the bottom end of the conveying pipe 28. The input end of the water pump 29 is connected to an external water source. In use, the water pump 29 is turned on, and the external water source is transmitted to the circular groove 25 through the conveying pipe 28. As the water pressure increases, the sealing gasket 27 is lifted, and water enters the mixing tank 8. At the same time, the first motor 24 is turned on, driving the stirring rod 22 to rotate, thereby fully stirring the injected water and salt products. When the water pump 29 is turned off, the water pressure gradually decreases, and the second spring 26 pulls the sealing gasket 27 back to its original position.

[0067] Salt granules and water can be added directly through the inlet of the mixing tank 8, but this increases the labor intensity. This embodiment provides an automatic water addition function.

[0068] In a preferred embodiment, the rotating component includes a third motor 37 and a built-in slot 36;

[0069] The bottom chamfer plate 2 has an internal groove 36. A third motor 37 is fixedly connected to the bottom of the inner wall of the internal groove 36. The bottom of the top chamfer plate 3 has a rotating shaft. The third motor 37 drives the rotating shaft to rotate, and the rotating shaft is rotatably connected to the bottom chamfer plate. The internal groove 36 is located above the first through groove 7.

[0070] In a preferred embodiment, the vertical moving component includes a vertical lead screw 30, a sliding plate 31, and a vertical guide post 34;

[0071] A lead screw 30 is rotatably connected inside the top chamfer plate 3. A sliding plate 31 is fixedly connected to the left side of the top plate 4, and the sliding plate 31 passes through the top chamfer plate 3. The middle thread of the sliding plate 31 is threaded onto the outside of the lead screw 30. An extension plate 32 is fixedly connected to the left side of the sliding plate 31. A vertical guide post 34 is fixedly connected to the top chamfer plate 3. The extension plate 32 is slidably connected to the outside of the guide post 34. A second motor 35 that drives the lead screw 30 to rotate is fixedly connected to the top of the top chamfer plate 3.

[0072] The left side of the top chamfer plate is fixedly connected to two side plates arranged vertically, and guide posts are fixedly connected to the side of the two side plates that are close to each other.

[0073] In a preferred embodiment, the horizontal moving component includes a horizontal bidirectional threaded rod 38, two trapezoidal plates 39, and a fourth motor 40;

[0074] The top plate 4 is rotatably connected to both ends with bidirectional threaded rods 38. The tops of the two clamping plates 5 are fixedly connected with trapezoidal plates 39, which are threaded onto the outside of both ends of the bidirectional threaded rods 38. A fourth motor 40 for driving the bidirectional threaded rods 38 to rotate is fixedly connected to the right side of the top plate 4. The top plate 1 also has a horizontal sliding rod inside, on which the two trapezoidal plates 16 slide.

[0075] In a preferred embodiment, the top wall of the mixing tank 8 is provided with a through hole 12. It should be noted that the part of the top wall with the through hole 12 should be thickened as needed. The mixing tank 21 is connected to the salt box 11 through the through hole 12. A connecting rod 13 is rotatably installed on the top wall of the mixing tank 8. A butterfly valve plate 14 is fixedly connected to the left side of the connecting rod 13. The butterfly valve plate 14 is placed in the through hole 12. A knob 15 is fixedly connected to the right side of the connecting rod 13. The connecting rod 13 is rotatably connected to the inner wall of the mixing tank 8. The knob 15 is located on the outside of the mixing tank 8. The outline shape of the through hole 12 when it is horizontal matches the through hole 12. The connecting rod 13 is set horizontally.

[0076] A retaining plate 16 is horizontally slidably connected inside the knob 15. Multiple limiting grooves 17 are provided on the right outer surface of the mixing tank 8, evenly distributed circumferentially along the axis of the connecting rod 13. The retaining plate can be selectively inserted into a specific limiting groove 17. Marks are provided on the right outer surface of the mixing tank 8 to indicate the position of the limiting groove 17. A pull ring is fixed to the right side of the retaining plate 16 on the outer surface of the knob 15. Pulling the pull ring moves the retaining plate 16 away from the limiting groove; the pull ring has a mark indicating the end position of the retaining plate 16.

[0077] Furthermore, the knob 15 is provided with a horizontal groove 18, and a horizontal plate 19 is horizontally slidably connected in the horizontal groove 18. A pull ring 20 is fixedly connected to the right side of the horizontal plate 19, and a retaining plate 16 is fixedly connected to the left side of the pull ring 20. A first spring 21 is fixedly connected to the left side of the horizontal plate 19, and the left end of the first spring 21 is fixedly connected to the left side of the inner wall of the horizontal groove 18.

[0078] The knob has a horizontal groove inside, parallel to the upper and lower parts of the retaining plate, facing the outer surface of the knob. A horizontal plate is horizontally slidably connected inside the groove. A pull ring is fixedly connected to the right side of the horizontal plate 19, and the retaining plate is fixedly connected to the left side of the pull ring. A first spring is fixedly connected to the left side of the horizontal plate 19, and the left end of the first spring is fixedly connected to the left side of the inner wall of the horizontal groove. The first spring 21 realizes the reset function of the horizontal plate 19.

[0079] When the horizontal cross-section of the through hole 12 is circular, and the butterfly valve plate 14 is in a horizontal state, the through hole 12 is closed; the outer periphery of the butterfly valve plate 14 is rounded; when it is necessary to adjust the butterfly valve plate 14, pull the pull ring 20 to the right, the pull ring 20 drives the locking plate 16 to move until it moves out of a limiting groove 17, then rotate the knob 15, the knob 15 drives the connecting rod 13 to rotate, the connecting rod 13 drives the butterfly valve plate 14 to rotate, thereby adjusting the horizontal angle of the butterfly valve plate 14, creating a gap between the butterfly valve plate 14 and the inner wall of the through hole 12, and the salt products in the salt granule box 11 will flow into the mixing box 8 through the gap, thus... It mixes with the water in the mixing tank 8; at the same time, when the knob 15 is rotated, the clamping plate 16 and the horizontal plate 19 will rotate accordingly. When the clamping plate 16 reaches the position of other limiting grooves 17, under the tension of the first spring 21, the horizontal plate 19 is pulled to the left, which drives the pull ring 20 and the clamping plate 16 to move to the left. Then the clamping plate 16 gradually enters the corresponding limiting groove 17, so that the position of the butterfly valve plate 14 is fixed, and the size of the gap between it and the through hole 12 is fixed, so that the salt product maintains a uniform flow rate; by adjusting the angle of the butterfly valve plate 14, the flow rate of the salt product can be controlled to adapt to different experimental requirements.

[0080] In use, the object to be tested is weighed and recorded. It is then placed on one side of the two clamping plates 5, close to each other. The fourth motor 40 is then activated, driving the bidirectional threaded rod 38 to rotate, causing the trapezoidal plates 39 on both sides to move closer together and clamp the object. The second motor 35 is then activated, driving the lead screw 30 to rotate, causing the sliding plate 31 and the top plate 4 to move downwards, thus drawing the object into the high-low temperature alternating chamber 6 for freezing. After freezing, the heating function is activated to heat the object. After heating, the second motor 35 is activated again to move the object upwards from inside the high-low temperature alternating chamber 6, and the third motor 37 is activated, driving the top chamfered plate 3 to rotate, moving the object to the left side of the bottom chamfered plate 2. The second motor 35 is then activated again to move the object to the left side of the spray plate 9, and the water pump 29 is activated to pump external water into the mixing tank 8. When external water enters the bottom of the sealing gasket 27, the continuous water flow impacts the sealing gasket 27, causing water to enter the interior of the mixing tank 8. After the water pump 29 stops working, under the action of the second spring 26, the bottom of the sealing gasket 27 abuts against the bottom of the inner wall of the mixing tank 8 again. The pull ring 20 moves further to the right, causing the clamping plate 16 to move to the right as well, thereby disengaging the clamping plate 16 from the interior of a certain limiting groove 17. Then, the knob 15 is turned, causing the connecting rod 13 and the butterfly valve plate 14 to rotate, thereby allowing the salt products inside the salt granule box 11 to enter the interior of the mixing tank 8. Then, the first motor 24 is started, causing the stirring rod 22 to start rotating, fully stirring the internal mixed solution. Then, the liquid pump 23 is started to pump the fully stirred salt solution inside the mixing tank 8 to the interior of the spray plate 9 and spray it onto the surface of the concrete specimen. It stays for a period of time to allow the salt solution on the surface to fully contact the concrete specimen. This is a complete freeze-thaw experiment. After multiple freeze-thaw cycles and recording the weight changes of concrete specimens each time, the salt-freezing resistance index of concrete was finally evaluated by analyzing the gradient changes in the data.

[0081] The western part of Jilin Province, located in the heart of the Songnen Plain, is a typical seasonally frozen region in my country and also one of the areas with severe soil salinization, experiencing frequent freeze-thaw cycles. In this region, soil salt concentration changes with the seasons; similarly, in coastal areas like Dalian, the salt concentration of the water surrounding concrete structures that are submerged for extended periods fluctuates with temperature changes. Therefore, when simulating the actual salt concentration gradient in a natural environment—that is, the trend of salt concentration change—without requiring precise salt concentration, the butterfly valve plate 14 can greatly simulate the changes in salt concentration in the real environment. Specifically, rotating the knob 15 causes the butterfly valve plate 14 to rotate, establishing a locking relationship between the locking plate 16 and the new limiting groove, thereby adjusting the concentration of the salt solution sprayed by the spray plate 9. This process is repeated to complete a single experiment. After multiple experiments, the object to be tested is removed and re-weighed for comparison. This invention simulates changes in salt concentration in a real environment through repeated single experiments using a mechanical structure, and then measures the degree of salt erosion of concrete by comparing the weights after multiple single experiments. A specific implementation method is listed below:

[0082] The knob 15 is equipped with a pointer mark, and the outer right side of the mixing tank 8 is equipped with a number mark along the circumference of the knob 15. When the pointer mark points to the 12 o'clock position, the butterfly valve plate 14 is in a horizontal state. First experiment: A certain amount of water was first pumped into the mixing tank 8, then the pointer was rotated to the 1 o'clock position to allow salt to flow into the mixing tank 8. Simultaneously with the salt flow, the stirring rod 22 was started to rotate and stir. After 3 minutes, the pointer was reset to close the through hole 12, and stirring continued for a certain period. Finally, the pump 23 was started to spray all the solution onto the freeze-thawed concrete specimen. Second experiment: A certain amount of water was first pumped into the mixing tank 8, then the pointer was rotated to the 3 o'clock position to allow salt to flow into the mixing tank 8. Simultaneously with the salt flow, the stirring rod 22 was started to rotate and stir. After 3 minutes, the pointer was reset to close the through hole 12, and stirring continued for a certain period. Finally, the pump 23 was started to spray all the solution onto the freeze-thawed concrete specimen. Because the butterfly valve 14 opened at a greater angle in the second experiment than in the first experiment, the spray concentration in the second experiment was greater than that in the first experiment when using the same weight of water. Finally, by comparing the weight data of the concrete after the two experiments, the degree of erosion of concrete by changes in salt concentration under natural conditions can be quantitatively assessed; the weight changes of concrete with different compositions during the same test process can also be compared. If further research is needed on the specific value of salt concentration and its erosion effect on concrete, all known weights of salt products in salt granule box 11 can be added to the mixing tank for each experiment.

[0083] The salt tank 11 provides an independent and stable storage space for salt products, enabling a continuous supply of salt products based on its own storage capacity, significantly improving the continuity and convenience of experimental operations. The design employs a locking plate 16 that engages with any limiting groove 17. Its core purpose is to facilitate the positioning of the butterfly valve plate 14 at different angles to achieve different flow rates, thereby adjusting the concentration of the experimental solution. Furthermore, once the butterfly valve plate 14 is positioned, it provides a stable flow rate for the salt, which helps to disperse the salt more evenly in the mixing tank, thus improving the uniformity of mixing. In addition, compared to using an electric regulating valve to control the flow rate, this design reduces the risk of electrical failures and lowers the overall manufacturing and maintenance costs of the equipment.

[0084] In summary, this utility model achieves the function of testing concrete through the cooperation of high and low temperature alternating chamber 6, clamping plate 5, bidirectional threaded rod 38, lead screw 30, third motor 37, spraying plate 9 and liquid pump 23. Through the cooperation of salt granule box 11, stirring rod 22, butterfly valve plate 14, connecting rod 13, clamping plate 16, horizontal plate 18, first spring 21 and pull ring 20, the function of adjusting salt solution concentration is realized, thereby improving the accuracy and efficiency of testing.

[0085] Furthermore, traditional methods require placing the test sample in a container before placing it in a high-low temperature alternating test chamber, which imposes significant volume restrictions on the test sample. This invention places the test sample directly inside the high-low temperature alternating test chamber 6, thus reducing volume restrictions compared to traditional methods. The above description only illustrates certain exemplary embodiments of this invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of this invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of this invention.

Claims

1. A concrete salt-freezing test device for seasonally frozen zones, characterized in that, include: Bottom plate (1), bottom chamfer plate (2), top chamfer plate (3), top plate (4), a pair of clamping plates (5), high and low temperature alternating chamber (6), mixing tank for providing brine (8), spraying device (9), liquid pump (23); The bottom chamfer plate (2) is fixedly connected to the top of the base plate (1); The top of the bottom chamfer plate (2) is rotatably connected to the top chamfer plate (3), and the rotating component connected to the bottom chamfer plate (2) drives the top chamfer plate (3) to rotate. A vertical moving component is connected to the top chamfer plate (3), and the vertical moving component drives the top plate (4) to move up and down. The top plate (4) and the top chamfer plate (3) are vertically slidably connected. A horizontal moving component is connected to the top plate (4), which drives a pair of clamping plates (5) to move closer or further apart. The clamping plates (5) are used to clamp the object to be tested. The top wall of the high and low temperature alternating box (6) is provided with an opening and is fixed to the right side of the top surface of the bottom plate (1). The top plate (4) can close the opening. The bottom chamfered plate (2) has a first through groove (7), and the mixing box (8) is fixed on the bottom of the first through groove (7); The spraying device (9) is fixed to the outside of the left side of the bottom chamfer plate (2); The inlet of the spraying device (9), the liquid pump (23), and the bottom of the mixing tank (8) are connected in sequence. The liquid pump (23) inputs the salt solution after stirring in the mixing tank (8) into the spraying device (9), and the spraying device (9) sprays the salt solution onto the object to be tested.

2. The concrete salt freezing test equipment for seasonally frozen areas according to claim 1, characterized in that, The top of the mixing tank (8) is connected to the salt tank (11). The top wall of the mixing tank (8) is provided with a through hole (12). The mixing tank (8) is connected to the salt tank (11) through the through hole (12). A valve that can change the flow rate is provided on the through hole (12).

3. The concrete salt freezing test equipment for seasonally frozen areas according to claim 1, characterized in that, The rotating component includes a third motor (37) and an internal slot (36); The bottom chamfer plate (2) has an internal groove (36), and a third motor (37) is fixedly connected to the bottom of the inner wall of the internal groove (36). The bottom of the top chamfer plate (3) is provided with a rotating shaft, and the third motor (37) drives the rotating shaft to rotate.

4. The concrete salt freezing test equipment for seasonally frozen areas according to claim 1, characterized in that, The vertical moving component includes a vertical lead screw (30), a sliding plate (31), and a vertical guide column (34). The top chamfer plate (3) is rotatably connected to a lead screw (30). A sliding plate (31) is fixedly connected to the left side of the top plate (4). The sliding plate (31) is threaded onto the outside of the lead screw (30). An extension plate (32) is fixedly connected to the left side of the sliding plate (31). A guide post (34) is fixedly connected to the top chamfer plate (3). The extension plate (32) is slidably connected to the outside of the guide post (34). A second motor (35) that drives the lead screw (30) to rotate is fixedly connected to the top of the top chamfer plate (3).

5. The concrete salt freezing test equipment for seasonally frozen areas according to claim 1, characterized in that, The horizontal moving component includes a bidirectional threaded rod (38), two trapezoidal plates (39), and a fourth motor (40). The top plate (4) is rotatably connected to the two ends of the bidirectional threaded rod (38), and the top of the two clamping plates (5) is fixedly connected to the trapezoidal plate (39). The two trapezoidal plates (39) are threaded onto the outside of the two ends of the bidirectional threaded rod (38). The right side of the top plate (4) is fixedly connected to the fourth motor (40) that drives the bidirectional threaded rod (38) to rotate.

6. A concrete salt-freezing testing device for seasonally frozen zones according to any one of claims 1-2, characterized in that, A stirring rod (22) is rotatably installed inside the mixing tank (8), and a first motor (24) is fixedly installed on the top of the mixing tank (8). The output end of the first motor (24) is connected to the top end of the stirring rod (22).

7. The concrete salt freezing test equipment for seasonally frozen areas according to claim 2, characterized in that, A connecting rod (13) is rotatably mounted on the top wall of the mixing tank (8). A butterfly valve plate (14) is fixedly connected to the left side of the connecting rod (13) as a valve. The butterfly valve plate (14) is placed in the through hole (12). A knob (15) is fixedly connected to the right side of the connecting rod (13). The connecting rod (13) is rotatably connected to the inner wall of the mixing tank (8). The knob (15) is located on the outside of the mixing tank (8). A locking plate (16) is horizontally slidably connected inside the knob (15). Multiple limiting grooves (17) are provided on the right side of the mixing tank (8). The multiple limiting grooves (17) are evenly distributed around the axis of the connecting rod (13). The locking plate (16) can be selectively inserted into a certain limiting groove (17). A pull ring (20) located on the outer surface of the knob (15) is fixed on the right side of the locking plate (16).

8. The concrete salt freezing test equipment for seasonally frozen areas according to claim 7, characterized in that, The knob (15) is provided with an outward-facing horizontal groove (18), and a horizontal plate (19) is horizontally slidably connected in the horizontal groove (18). A pull ring (20) is fixedly connected to the right side of the horizontal plate (19), and a retaining plate (16) is fixedly connected to the left side of the pull ring (20). A first spring (21) is fixedly connected to the left side of the horizontal plate (19), and the left end of the first spring (21) is fixedly connected to the left side of the inner wall of the horizontal groove (18).

9. The concrete salt freezing test equipment for seasonally frozen areas according to claim 1, characterized in that, The bottom of the mixing tank (8) is connected to a conveying pipe (28), which is connected to a water pump (29). The water pump (29) pumps external water to the mixing tank (8). The bottom of the mixing tank (8) is provided with a valve to open or close the conveying pipe (28).

10. The concrete salt freezing test equipment for seasonally frozen areas according to claim 1, characterized in that, The spraying device (9) is a spraying plate, which is a hollow cavity. Multiple spraying holes (42) are provided on the left side of the spraying plate, and an input port is provided on the right side of the spraying plate.

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