A shear strength detection device and detection method for asphalt mixture

Abstract

The present invention discloses a shear strength detection device for asphalt mixture and a detection method thereof, comprising a base, a frame and a top seat, wherein a fixed seat is movably mounted on the base, a rotating shaft is rotatably mounted on the frame, the rotating shaft penetrates the fixed seat and is fixedly connected to the fixed seat, a buffer bottom plate is mounted on the upper end of the fixed seat, a lower mold is arranged on the buffer bottom plate, a hydraulic cylinder is fixedly mounted on the top seat, a lifting top plate is fixedly connected to the extended end of the hydraulic cylinder, the lifting top plate is slidably connected to the frame, and an upper mold is fixedly mounted below the lifting top plate. The present invention sets the upper mold and the lower mold at 45 degrees, and when working, the columnar asphalt mixture to be detected can be placed obliquely inside the lower mold, and then the hydraulic cylinder is extended to push the lifting top plate downward, so that the upper mold presses down the columnar asphalt mixture, so that the asphalt mixture can be subjected to a shear test, and the shear test efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt mixture detection, and in particular to a shear strength detection device and a detection method for asphalt mixture. Background Art

[0002] With the rapid development of society, the technical requirements for asphalt pavements in highways are getting higher and higher, and the construction technology is also constantly improving; with the development of transportation, the increase in traffic volume, overloading and heavy loading, many highways have serious rutting problems shortly after opening to traffic, and the rutting problem is closely related to the shear properties of asphalt mixtures; in addition to load and environment, factors affecting the shear strength of pavement are also related to pavement materials and structures; therefore, studying the shear properties of asphalt mixtures and asphalt pavements is very necessary for pavement structure design and material design.

[0003] The existing asphalt mixture shear strength testing device has a complex structure and is not easy to operate. During the testing process, the asphalt mixture is prone to collapse under pressure, causing harm to the tester. At the same time, after the existing testing device is used, the slag falls on the testing table, which is not easy to clean, thus affecting the use of the device, and needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a shear strength detection device and a detection method for asphalt mixture to solve the above technical problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a shear strength detection device for asphalt mixture, comprising a base, a frame and a top seat, the base is movably provided with a fixed seat, the frame is rotatably provided with a rotating shaft, the rotating shaft passes through the fixed seat and is fixedly connected to the fixed seat, a buffer bottom plate is installed on the upper end of the fixed seat, a lower mold is provided on the buffer bottom plate, a hydraulic cylinder is fixedly installed on the top seat, a lifting top plate is fixedly connected to the extending end of the hydraulic cylinder, the lifting top plate is slidably connected to the frame, an upper mold is fixedly installed below the lifting top plate, a transparent protective cover is provided on the lifting top plate, the transparent protective cover passes through the lifting top plate and is slidably connected to the lifting top plate, the upper mold and the lower mold are staggered, a cavity is provided inside the base, and a movable support mechanism is installed inside the cavity, and the top end of the movable support mechanism is in contact with the lower surface of the fixed seat.

[0006] As a further preferred embodiment of the present technical solution: the lower mold and the upper mold are both arranged in an arc groove shape, the lower mold opening is upward and installed at a 45-degree angle on the buffer bottom plate, and the upper mold opening is downward and installed at a 45-degree angle below the lifting top plate.

[0007] As a further preferred embodiment of the present technical solution: the movable support mechanism includes two transmission screws, the two transmission screws are fixedly connected by a rotating rod, a driving motor is provided on one side of the outside of the base, the output shaft of the driving motor is fixedly connected to one end of any one of the transmission screws, the textures on the two transmission screws are arranged in opposite directions, the two transmission screws are provided with screw nuts, and a movable support plate is fixedly installed on the two screw nuts.

[0008] As a further preferred embodiment of the present technical solution: sliders are fixedly installed on both side walls of the movable support plate, and sliding grooves are opened on both side walls inside the base. The movable support plate is slidably connected to the base through the sliders and the sliding grooves, and the top end of the movable support plate is in contact with the bottom end of the fixed seat.

[0009] As a further preferred embodiment of the technical solution: a planetary gear is installed on any of the transmission screws, a pulley is sleeved on the planetary gear, a pulley is fixedly sleeved on the rotating shaft, and a transmission belt is connected between the two pulleys.

[0010] As a further preferred embodiment of the technical solution: one end of the two transmission screws extends to the outside of the base and is fixedly installed with an eccentric wheel, piston cylinders are fixedly installed on the two side walls of the base, a piston plate is provided inside the piston cylinder, a piston rod is movably connected to the lower surface of the piston plate, and one end of the piston rod is movably connected to one side of the eccentric wheel.

[0011] As a further preferred embodiment of the present technical solution: the input end and the output end of the piston cylinder are both provided with a one-way valve, the output end of the piston cylinder is connected to an air supply pipe, one end of the air supply pipe is connected to the interior of an air intake chamber provided inside the rotating shaft, a jet chamber seat is fixedly installed on one side of the upper surface of the buffer base plate, the air intake chamber is connected to the interior of the jet chamber seat through a pipeline, a plurality of jet heads are installed on one side surface of the jet chamber seat, and the jet heads face the upper surface of the buffer base plate.

[0012] As a further preferred embodiment of the present technical solution: a plurality of springs are installed on the lower surface of the buffer base plate, one end of the spring is fixedly connected to the fixed seat, a plurality of grooves are opened on the lower surface of the buffer base plate, magnet blocks are fixedly installed inside the plurality of grooves, a plurality of grooves are correspondingly opened on the upper surface of the fixed seat, electromagnets are fixedly installed inside the plurality of grooves, and the electromagnets are arranged in a one-to-one correspondence with the magnet blocks.

[0013] As a further preferred embodiment of the technical solution: a switch is fixedly installed on one side wall of the base, the switch is electrically connected to the electromagnet, the switch is located below the eccentric wheel, the eccentric wheel intermittently abuts against the switch, an opening is provided at the bottom end of the base, a slag collecting pan is provided below the base, and the slag collecting pan is slidably connected to the base.

[0014] A detection method for a shear strength detection device for asphalt mixture comprises the following steps:

[0015] Step 1: Place the columnar asphalt mixture to be tested in an inclined manner inside the lower mold, and then use the hydraulic cylinder to extend and push the lifting top plate downward, so that the top of the columnar asphalt mixture is inserted into the upper mold. The upper mold continues to move downward to extrude the asphalt mixture to achieve shear resistance test;

[0016] Step 2: After the test, the hydraulic cylinder is used to move up to drive the lifting top seat to move up, and at the same time, the transparent protective cover is reset under its own gravity, and the drive motor is started to rotate forward, so that the two screw nuts move backwards, and the moving support plate is driven to move synchronously and separate from the fixed seat, and at the same time, the fixed seat and the buffer bottom plate are turned over, so that the slag in the buffer bottom plate and the lower mold falls quickly;

[0017] Step 3: While the fixed seat is turning at a uniform speed, the eccentric wheel is driven to rotate by the rotation of the transmission screw. The eccentric wheel can push and pull the piston rod back and forth while rotating, so that the gas inside the piston cylinder is squeezed out and sent into the inside of the jet chamber seat through the air pipe. Then, the gas is blown to the surface of the buffer bottom plate through the jet head to blow off the slag attached to the buffer bottom plate;

[0018] Step 4: During the uniform reversal of the fixed seat and the buffer bottom plate, the eccentric wheel intermittently squeezes the switch. When the switch is squeezed, the electromagnet is energized to attract the magnet block, so that the buffer bottom plate moves downward. When the eccentric wheel is separated from the switch, the electromagnet is de-energized, the magnet block is separated from the electromagnet, and the spring pushes the buffer bottom plate upward, so that the buffer bottom plate shakes, thereby facilitating the shaking off of the slag on the buffer bottom plate and cleaning the buffer bottom plate.

[0019] Step 5: After flipping and cleaning, use the drive motor to rotate in the opposite direction to drive the two reciprocating screws to rotate. The shaft rotates at a constant speed to drive the fixed seat and the buffer bottom plate to flip and reset. At the same time, the support plate is moved to the bottom end of the fixed seat to support the fixed seat.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention sets an upper mold and a lower mold, and sets the upper mold and the lower mold at 45 degrees. When working, the columnar asphalt mixture to be tested can be placed in an inclined manner inside the lower mold, and then the hydraulic cylinder is extended to push the lifting top plate downward, so that the top of the columnar asphalt mixture can be inserted into the upper mold. When the hydraulic cylinder continues to extend downward, the upper mold can press down the columnar asphalt mixture, so that the asphalt mixture can be subjected to a shear test, and there is no need to fix the asphalt mixture to be tested, etc., which effectively improves the efficiency of the shear test.

[0022] 2. The present invention provides a rotating shaft on the fixed seat, and connects the rotating shaft to the planetary gear provided on the transmission screw through a transmission belt. After the detection is completed, the driving motor can be used to rotate forward, so that the two screw nuts move in reverse directions, and drive the movable support plate to move synchronously, so that the movable support plate is separated from the fixed seat. At the same time, the transmission belt drives the rotating shaft to rotate at a uniform speed, so that the fixed seat and the buffer bottom plate can be flipped, so that the slag in the buffer bottom plate and the lower mold can fall quickly, and it can be effectively cleaned for easy use.

[0023] 3. The present invention provides a jet chamber seat, and during the process of uniform reversal of the fixed seat and the buffer bottom plate, the eccentric wheel can be driven to rotate by the rotation of the transmission screw. The piston rod can be pushed and pulled back and forth while the eccentric wheel rotates. When the eccentric wheel pushes the piston rod upward, the gas inside the piston cylinder can be squeezed out and sent into the air cavity through the air pipe, and then enters the jet chamber seat. The gas is then blown toward the surface of the buffer bottom plate through the jet head to blow off the slag attached to the buffer bottom plate.

[0024] 4. The present invention arranges a magnet block and an electromagnet, and arranges the switch of the electromagnet below the eccentric wheel. In the process of uniform reversal of the fixed seat and the buffer bottom plate, the eccentric wheel can intermittently squeeze the switch. When the switch is squeezed, the electromagnet is energized to adsorb the magnet block, so that the buffer bottom plate moves downward. When the eccentric wheel is separated from the switch, the electromagnet is de-energized, the magnet block is separated from the electromagnet, and the spring pushes the buffer bottom plate to move up. This reciprocating process can make the buffer bottom plate shake, thereby facilitating the shaking off of the slag on the buffer bottom plate and facilitating the quick cleaning of the buffer bottom plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0027] Figure 3 It is a partial structural schematic diagram of the present invention;

[0028] Figure 4 This is a top view of the structure of the buffer bottom plate of the present invention;

[0029] Figure 5 For the present invention Figure 3 Schematic diagram of the structure of part A;

[0030] Figure 6 For the present invention Figure 3 Schematic diagram of the structure of part B;

[0031] Figure 7 It is a schematic diagram of the upper mold structure of the present invention;

[0032] Figure numerals: 1. base; 2. frame; 3. top seat; 4. hydraulic cylinder; 5. lifting top plate; 6. driving motor; 7. transparent protective cover; 8. lower mold; 9. piston cylinder; 10. rotating shaft; 11. fixed seat; 12. slag collecting plate; 13. upper mold; 14. rotating rod; 15. transmission screw; 16. eccentric wheel; 17. transmission belt; 18. screw nut; 19. movable support plate; 20. slide groove; 21. slider; 22. buffer bottom plate; 23. jet chamber seat; 24. jet head; 25. air inlet chamber; 26. air supply pipe; 27. spring; 28. electromagnet; 29. ​​piston rod; 30. switch; 31. magnet block; 32. ball bearing. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0034] The specific embodiments of the present invention are described below with reference to the accompanying drawings. Example

[0035] like Figure 1 , Figure 2 and Figure 7 As shown, a shear strength testing device for asphalt mixture comprises a base 1, a frame 2 and a top seat 3, a fixed seat 11 is movably mounted on the base 1, a rotating shaft 10 is rotatably mounted on the frame 2, the rotating shaft 10 penetrates the fixed seat 11 and is fixedly connected to the fixed seat 11, a buffer bottom plate 22 is mounted on the upper end of the fixed seat 11, a lower die 8 is arranged on the buffer bottom plate 22, a hydraulic cylinder 4 is fixedly mounted on the top seat 3, a lifting top plate 5 is fixedly connected to the extended end of the hydraulic cylinder 4, the lifting top plate 5 is slidably connected to the frame 2, an upper die 13 is fixedly mounted below the lifting top plate 5, a transparent protective cover 7 is arranged on the lifting top plate 5, the transparent protective cover 7 penetrates the lifting top plate 5 and is slidably connected to the lifting top plate 5, the upper die 13 and the lower die 8 are staggered, a cavity is arranged inside the base 1, and a movable support mechanism is installed inside the cavity, and the top end of the movable support mechanism contacts the lower surface of the fixed seat 11;

[0036] The lower die 8 and the upper die 13 are both arranged in an arc-shaped groove, the lower die 8 opens upward and is installed at a 45-degree angle on the buffer bottom plate 22, and the upper die 13 opens downward and is installed at a 45-degree angle below the lifting top plate 5;

[0037] During the working process: the columnar asphalt mixture to be tested can be placed in an inclined manner inside the lower mold 8, and then the hydraulic cylinder 4 is extended to push the lifting top plate 5 downward, so that the top of the columnar asphalt mixture can be inserted into the upper mold 13. When the hydraulic cylinder 4 continues to extend downward, the upper mold 13 can press down the columnar asphalt mixture, so that the asphalt mixture can be subjected to a shear test, and there is no need to fix the asphalt mixture to be tested, etc., which effectively improves the efficiency of the shear test;

[0038] At the same time, if Figure 1 and Figure 2 As shown, the lower die 8 and the upper die 13 are arranged at a 45-degree angle, which can achieve a good shear strength detection and monitoring effect; Figure 7 As shown, a ball 32 is installed on the top of the upper mold 13, and the upper mold 13 is connected to the lifting top plate 5 through the ball 32. When the upper mold 13 is subjected to pressure during the test, it can be used to adjust the balance, so that the device has high working stability.

[0039] Example 2

[0040] like Figure 2 , Figure 3 As shown, the mobile support mechanism includes two transmission screws 15, and the two transmission screws 15 are fixedly connected by a rotating rod 14. A driving motor 6 is provided on one side of the outside of the base 1, and the output shaft of the driving motor 6 is fixedly connected to one end of any transmission screw 15. The textures on the two transmission screws 15 are arranged in reverse, and screw nuts 18 are provided on the two transmission screws 15. A mobile support plate 19 is fixedly installed on the two screw nuts 18; sliders 21 are fixedly installed on the two side walls of the mobile support plate 19, and slide grooves 20 are provided on the two side walls inside the base 1. The mobile support plate 19 is slidably connected to the base 1 through the sliders 21 and the slide grooves 20, and the top of the mobile support plate 19 contacts the bottom end of the fixed seat 11; a planetary gear is installed on any transmission screw 15, and a pulley is sleeved on the planetary gear. A pulley is also fixedly sleeved on the rotating shaft 10, and a transmission belt 17 is connected between the two pulleys;

[0041] During the working process: when the detection is completed, the driving motor 6 can be used to rotate forward to drive the transmission screw 15 to rotate. Since the patterns on the two transmission screws 15 are set in opposite directions, the two screw nuts 18 can move in opposite directions and drive the movable support plate 19 to move synchronously. While the support plate moves, it can slide along the slide groove 20 through the slider 21, so that the movable support plate 19 is separated from the fixed seat 11. The transmission screw 15 drives the planetary gear to rotate at a constant speed. While the planetary gear rotates, the transmission belt 17 drives the rotating shaft 10 to rotate at a constant speed, so that the fixed seat 11 and the buffer bottom plate 22 can be turned over, so that the slag in the buffer bottom plate 22 and the lower mold 8 can fall off quickly, which can be effectively cleaned and convenient for use;

[0042] After flipping and cleaning, the driving motor 6 can be used to rotate in the opposite direction to drive the two reciprocating screws to rotate, so that the two screw nuts 18 can move toward each other and drive the two movable support plates 19 to move toward each other. At the same time, the rotating shaft 10 rotates at a uniform speed to drive the fixed seat 11 and the buffer bottom plate 22 to flip and reset, and the movable support plate 19 moves to the bottom end of the fixed seat 11 to support the fixed seat 11. Example

[0043] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, one end of the two transmission screws 15 extends to the outside of the base 1 and is fixedly installed with an eccentric wheel 16, and a piston cylinder 9 is fixedly installed on both side walls of the base 1, and a piston plate is provided inside the piston cylinder 9, and a piston rod 29 is movably connected to the lower surface of the piston plate, and one end of the piston rod 29 is movably connected to one side of the eccentric wheel 16; the input end and the output end of the piston cylinder 9 are both provided with a one-way valve, and the output end of the piston cylinder 9 is connected to an air supply pipe 26, and one end of the air supply pipe 26 is connected to the inside of the rotating shaft 10. An air intake chamber 25 is provided inside the rotating shaft 10, and an air injection chamber seat 23 is fixedly installed on one side of the upper surface of the buffer bottom plate 22, and the air intake chamber 25 is connected to the inside of the air injection chamber seat 23 through a pipeline, and a plurality of air injection heads 24 are installed on one side of the air injection chamber seat 23, and the air injection heads 24 face the upper surface of the buffer bottom plate 22;

[0044] During the working process: while the fixed seat 11 is turned at a uniform speed, the transmission screw 15 is used to rotate the eccentric wheel 16, and while the eccentric wheel 16 rotates, the piston rod 29 can be pushed and pulled back and forth.

[0045] When the eccentric wheel 16 pushes the piston rod 29 upward, the gas inside the piston cylinder 9 can be squeezed out and sent into the air cavity through the air pipe 26, and then enter the inside of the jet chamber seat 23, and then the gas is blown to the surface of the buffer bottom plate 22 through the jet head 24 to blow off the slag attached to the buffer bottom plate 22;

[0046] When the eccentric wheel 16 pulls the piston rod 29 and the piston plate downward, negative pressure can be generated inside the piston cylinder 9, so that air can enter the piston cylinder 9 through the input end of the piston cylinder 9, which can facilitate reciprocating jet cleaning work. Example

[0047] like Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, a plurality of springs 27 are installed on the lower surface of the buffer bottom plate 22, one end of the spring 27 is fixedly connected to the fixed seat 11, a plurality of grooves are provided on the lower surface of the buffer bottom plate 22, magnet blocks 31 are fixedly installed inside the plurality of grooves, a plurality of grooves are correspondingly provided on the upper surface of the fixed seat 11, electromagnets 28 are fixedly installed inside the plurality of grooves, and the electromagnets 28 and the magnet blocks 31 are arranged one by one; a switch 30 is fixedly installed on one side wall of the base 1, the switch 30 is electrically connected to the electromagnet 28, the switch 30 is located below the eccentric wheel 16, the eccentric wheel 16 intermittently abuts against the switch 30, an opening is provided at the bottom end of the base 1, a slag collecting pan 12 is provided below the base 1, and the slag collecting pan 12 is slidably connected to the base 1;

[0048] During the working process: when the detection is completed, the eccentric wheel 16 can intermittently squeeze the switch 30 during the uniform reversal of the fixed seat 11 and the buffer bottom plate 22. When the switch 30 is squeezed, the electromagnet 28 is energized to adsorb the magnet block 31, so that the buffer bottom plate 22 moves down. When the eccentric wheel 16 is separated from the switch 30, the electromagnet 28 is de-energized, the magnet block 31 is separated from the electromagnet 28, and the spring 27 pushes the buffer bottom plate 22 to move up. This reciprocating motion can make the buffer bottom plate 22 shake, thereby facilitating the shaking off of the slag on the buffer bottom plate 22 and facilitating the quick cleaning of the buffer bottom plate 22. Example

[0049] A detection method for a shear strength detection device for asphalt mixture comprises the following steps:

[0050] Step 1: Place the columnar asphalt mixture to be tested in an inclined manner inside the lower mold 8, and then use the hydraulic cylinder 4 to extend and push the lifting top plate 5 downward, so that the top of the columnar asphalt mixture is inserted into the upper mold 13, and the upper mold 13 continues to move downward to extrude the asphalt mixture to achieve shear resistance test;

[0051] Step 2: After the test is completed, the hydraulic cylinder 4 can be used to move up to drive the lifting top seat 3 to move up, and at the same time, the transparent protective cover is reset under its own gravity, and the driving motor 6 is started to rotate forward, so that the two screw nuts 18 move backwards, and drive the moving support plate 19 to move synchronously and separate from the fixed seat 11, and at the same time, the fixed seat 11 and the buffer bottom plate 22 are turned over, so that the slag in the buffer bottom plate 22 and the lower mold 8 falls quickly;

[0052] Step 3: While the fixed seat 11 is turning at a uniform speed, the transmission screw 15 is used to rotate the eccentric wheel 16. While the eccentric wheel 16 is rotating, the piston rod 29 can be pushed and pulled back and forth, so that the gas inside the piston cylinder 9 is squeezed out and sent into the inside of the jet chamber seat 23 through the gas pipe 26, and then the gas is blown to the surface of the buffer bottom plate 22 through the jet head 24 to blow off the slag attached to the buffer bottom plate 22;

[0053] Step 4: During the uniform reversal of the fixed seat 11 and the buffer bottom plate 22, the eccentric wheel 16 intermittently squeezes the switch 30. When the switch 30 is squeezed, the electromagnet 28 is energized to attract the magnet block 31, so that the buffer bottom plate 22 moves downward. When the eccentric wheel 16 is separated from the switch 30, the electromagnet 28 is de-energized, the magnet block 31 is separated from the electromagnet 28, and the spring 27 pushes the buffer bottom plate 22 to move upward, so that the buffer bottom plate 22 shakes, thereby facilitating the shaking off of the slag on the buffer bottom plate 22 and cleaning the buffer bottom plate 22.

[0054] Step 5: After flipping and cleaning, the drive motor 6 can be used to rotate in the opposite direction to drive the two reciprocating screws to rotate. The rotating shaft 10 rotates at a constant speed to drive the fixed seat 11 and the buffer bottom plate 22 to flip and reset. At the same time, the supporting plate 19 moves to the bottom end of the fixed seat 11 to support the fixed seat 11.

[0055] Working principle: During the working process, the columnar asphalt mixture to be tested can be placed in an inclined manner inside the lower mold 8, and then the hydraulic cylinder 4 is extended to push the lifting top plate 5 downward, so that the top of the columnar asphalt mixture can be inserted into the upper mold 13. When the hydraulic cylinder 4 continues to extend downward, the upper mold 13 can press down the columnar asphalt mixture. Figure 2 As shown, a pressure detector is provided on the lifting top plate 5, which can perform shear test on the asphalt mixture, and there is no need to fix the asphalt mixture to be tested, which effectively improves the efficiency of the shear test;

[0056] At the same time, when the lifting top plate 5 moves down, the transparent protective cover can be driven to move down synchronously. When the bottom end of the transparent protective cover abuts against the rotating shaft 10, the transparent protective cover can be moved up relative to the lifting top plate 5. The transparent protective cover can be used to protect the asphalt mixture from breaking and collapsing during the shear test, thereby protecting the test personnel.

[0057] At the same time, if Figure 1 and Figure 2 As shown, the lower die 8 and the upper die 13 are arranged at a 45-degree angle, which can achieve a good shear strength detection and monitoring effect; Figure 7 As shown, a ball 32 is installed on the top of the upper mold 13, and the upper mold 13 is connected to the lifting top plate 5 through the ball 32, which can be used to adjust the balance when subjected to pressure during the test, so that the device has high working stability;

[0058] The upper die 13 and the lower die 8 are both made of steel, with a thickness of 20 mm, an inner die diameter of 101.6 mm, an upper die inner die height of 25 mm, and a lower die inner die height of 25 mm;

[0059] After the test is completed, the hydraulic cylinder 4 can be used to move up to drive the lifting top seat 3 to move up, and at the same time, the transparent protective cover can be reset under its own gravity. Then the driving motor 6 can be started to rotate forward to drive the transmission screw 15 to rotate. Since the patterns on the two transmission screws 15 are arranged in opposite directions, the two screw nuts 18 can move back to back and drive the movable support plate 19 to move synchronously. While the support plate moves, it can slide along the slide groove 20 through the slider 21, so that the movable support plate 19 is separated from the fixed seat 11. The transmission screw 15 drives the planetary gear to rotate at a constant speed. While the planetary gear rotates, the transmission belt 17 drives the rotating shaft 10 to rotate at a constant speed, so that the fixed seat 11 and the buffer bottom plate 22 can be turned over, so that the slag in the buffer bottom plate 22 and the lower mold 8 can fall off quickly, which can be effectively cleaned and convenient for use.

[0060] While the fixed seat 11 is turned over at a constant speed, the eccentric wheel 16 is driven to rotate by the rotation of the transmission screw 15. The eccentric wheel 16 can push and pull the piston rod 29 back and forth while rotating.

[0061] When the eccentric wheel 16 pushes the piston rod 29 upward, the gas inside the piston cylinder 9 can be squeezed out and sent into the air cavity through the air pipe 26, and then enter the inside of the jet chamber seat 23, and then the gas is blown to the surface of the buffer bottom plate 22 through the jet head 24 to blow off the slag attached to the buffer bottom plate 22;

[0062] When the eccentric wheel 16 pulls the piston rod 29 and the piston plate downward, negative pressure can be generated inside the piston cylinder 9, so that the air can enter the piston cylinder 9 through the input end of the piston cylinder 9, which can facilitate reciprocating jet cleaning work;

[0063] During the process of the fixed seat 11 and the buffer bottom plate 22 being reversed at a uniform speed, the eccentric wheel 16 can intermittently squeeze the switch 30. When the switch 30 is squeezed, the electromagnet 28 is energized to attract the magnet block 31, so that the buffer bottom plate 22 moves downward. When the eccentric wheel 16 is separated from the switch 30, the electromagnet 28 is de-energized, the magnet block 31 is separated from the electromagnet 28, and the spring 27 pushes the buffer bottom plate 22 to move upward. This reciprocating process can make the buffer bottom plate 22 shake, so as to facilitate shaking off the slag on the buffer bottom plate 22 and facilitate quick cleaning of the buffer bottom plate 22.

[0064] After flipping and cleaning, the driving motor 6 is used to rotate in the opposite direction to drive the two reciprocating screws to rotate, so that the two screw nuts 18 can move toward each other and drive the two movable support plates 19 to move toward each other. At the same time, the rotating shaft 10 rotates at a uniform speed to drive the fixed seat 11 and the buffer bottom plate 22 to flip and reset, and the movable support plate 19 moves to the bottom end of the fixed seat 11 to support the fixed seat 11, so as to facilitate further experimental detection.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A shear strength testing device for asphalt mixture, comprising a base (1), a frame (2) and a top seat (3), characterized in that: A fixed seat (11) is movably mounted on the base (1), a rotating shaft (10) is rotatably mounted on the frame (2), the rotating shaft (10) passes through the fixed seat (11) and is fixedly connected to the fixed seat (11), a buffer bottom plate (22) is mounted on the upper end of the fixed seat (11), a lower die (8) is arranged on the buffer bottom plate (22), a hydraulic cylinder (4) is fixedly mounted on the top seat (3), a lifting top plate (5) is fixedly connected to the extended end of the hydraulic cylinder (4), the lifting top plate (5) is slidably connected to the frame (2), an upper die (13) is fixedly mounted below the lifting top plate (5), a transparent protective cover (7) is arranged on the lifting top plate (5), the transparent protective cover (7) passes through the lifting top plate (5) and is slidably connected to the lifting top plate (5), the upper die (13) and the lower die (8) are staggered, a cavity is arranged inside the base (1), and a movable support mechanism is mounted inside the cavity, and the top end of the movable support mechanism is in contact with the lower surface of the fixed seat (11); The movable support mechanism comprises two transmission screws (15), the two transmission screws (15) are fixedly connected via a rotating rod (14), a driving motor (6) is provided on one side of the outside of the base (1), an output shaft of the driving motor (6) is fixedly connected to one end of any one of the transmission screws (15), the textures on the two transmission screws (15) are arranged in opposite directions, the two transmission screws (15) are provided with screw nuts (18), and the movable support plates (19) are fixedly mounted on the two screw nuts (18); One end of each of the two transmission screws (15) extends to the outside of the base (1) and is fixedly mounted with an eccentric wheel (16); a piston cylinder (9) is fixedly mounted on both side walls of the base (1); a piston plate is provided inside the piston cylinder (9); a piston rod (29) is movably connected to the lower surface of the piston plate; one end of the piston rod (29) is movably connected to one side of the eccentric wheel (16); A plurality of springs (27) are mounted on the lower surface of the buffer bottom plate (22), one end of the spring (27) being fixedly connected to the fixing seat (11), a plurality of grooves are provided on the lower surface of the buffer bottom plate (22), a magnet block (31) is fixedly mounted inside each of the plurality of grooves, a plurality of grooves are correspondingly provided on the upper surface of the fixing seat (11), an electromagnet (28) is fixedly mounted inside each of the plurality of grooves, and the electromagnets (28) and the magnet blocks (31) are arranged in a one-to-one correspondence.

2. The shear strength testing device for asphalt mixture according to claim 1, characterized in that: The lower die (8) and the upper die (13) are both arranged in an arc-shaped groove shape; the lower die (8) opens upward and is installed at a 45-degree angle on the buffer bottom plate (22); the upper die (13) opens downward and is installed at a 45-degree angle below the lifting top plate (5).

3. The shear strength testing device for asphalt mixture according to claim 2, characterized in that: Slide blocks (21) are fixedly mounted on both side walls of the movable support plate (19), and slide grooves (20) are provided on both side walls inside the base (1). The movable support plate (19) is slidably connected to the base (1) via the slide blocks (21) and the slide grooves (20), and the top end of the movable support plate (19) contacts the bottom end of the fixed seat (11).

4. The shear strength testing device for asphalt mixture according to claim 3 is characterized in that: A planetary gear is mounted on any one of the transmission screw rods (15), a belt pulley is sleeved on the planetary gear, a belt pulley is also fixedly sleeved on the rotating shaft (10), and a transmission belt (17) is connected between the two belt pulleys.

5. The shear strength testing device for asphalt mixture according to claim 4, characterized in that: The input end and the output end of the piston cylinder (9) are both provided with a one-way valve. The output end of the piston cylinder (9) is connected to an air supply pipe (26). One end of the air supply pipe (26) is connected to the interior of an air inlet chamber (25) provided inside the rotating shaft (10). An air jet chamber seat (23) is fixedly mounted on one side of the upper surface of the buffer bottom plate (22). The air inlet chamber (25) is connected to the interior of the air jet chamber seat (23) through a pipeline. A plurality of air jet heads (24) are mounted on one side of the surface of the air jet chamber seat (23). The air jet heads (24) face the upper surface of the buffer bottom plate (22).

6. The shear strength testing device for asphalt mixture according to claim 5, characterized in that: A switch (30) is fixedly mounted on one side wall of the base (1), the switch (30) being electrically connected to the electromagnet (28), the switch (30) being located below the eccentric wheel (16), the eccentric wheel (16) being intermittently in contact with the switch (30), an opening being provided at the bottom end of the base (1), a slag collecting pan (12) being provided below the base (1), the slag collecting pan (12) being slidably connected to the base (1).

7. A detection method based on the shear strength detection device for asphalt mixture according to claim 6, characterized in that: The steps include: Step 1: The columnar asphalt mixture to be tested is placed in an inclined manner inside the lower mold (8), and then the hydraulic cylinder (4) is extended to push the lifting top plate (5) downward, so that the top of the columnar asphalt mixture is inserted into the upper mold (13), and the upper mold (13) continues to move downward to extrude the asphalt mixture to achieve a shear test; Step 2: After the test is completed, the hydraulic cylinder (4) can be used to move upward to drive the lifting top seat (3) to move upward, and at the same time, the transparent protective cover is reset under the action of its own gravity, and the drive motor (6) is started to rotate forward, so that the two screw nuts (18) move backwards and drive the movable support plate (19) to move synchronously and separate from the fixed seat (11), and at the same time, the fixed seat (11) and the buffer bottom plate (22) are turned over, so that the slag in the buffer bottom plate (22) and the lower mold (8) falls quickly; Step 3: while the fixed seat (11) is turned at a uniform speed, the transmission screw (15) is rotated to drive the eccentric wheel (16) to rotate. While the eccentric wheel (16) is rotating, the piston rod (29) can be pushed and pulled back and forth, so that the gas inside the piston cylinder (9) is squeezed out and sent into the inside of the jet chamber seat (23) through the gas pipe (26), and then the gas is blown toward the surface of the buffer bottom plate (22) through the jet head (24), so that the slag attached to the buffer bottom plate (22) is blown off; Step 4: During the process of the fixed seat (11) and the buffer bottom plate (22) being reversed at a uniform speed, the eccentric wheel (16) intermittently squeezes the switch (30). When the switch (30) is squeezed, the electromagnet (28) is energized to attract the magnet block (31), so that the buffer bottom plate (22) moves downward. When the eccentric wheel (16) is separated from the switch (30), the electromagnet (28) is de-energized, the magnet block (31) is separated from the electromagnet (28), and the spring (27) pushes the buffer bottom plate (22) upward, so that the buffer bottom plate (22) shakes, thereby facilitating the shaking off of slag on the buffer bottom plate (22) and cleaning the buffer bottom plate (22); Step 5: After flipping and cleaning, the driving motor (6) is used to rotate in the opposite direction to drive the two reciprocating screws to rotate, and the rotating shaft (10) rotates at a constant speed to drive the fixed seat (11) and the buffer bottom plate (22) to flip and reset, and at the same time, the moving support plate (19) moves to the bottom end of the fixed seat (11) to support the fixed seat (11).

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