Asphalt concrete immersion residual Marshall stability detection device

Abstract

The utility model discloses an asphalt concrete immersion residual Marshall stability detection device, and relates to the technical field of detection instruments, the asphalt concrete immersion residual Marshall stability detection device comprises a main body, two stand columns, a lifting table, a lower pressure head and an upper pressure head, a lifting part is arranged in the main body, the lifting table is fixedly installed at the movable end of the lifting part, and the lifting part is used for controlling the lifting table to lift; the bottom of the lower pressing head is fixedly connected with a sleeve disc, the sleeve disc is placed on the lifting table, a through hole is formed in the sleeve disc, and the inner wall of the sleeve disc is matched with the outer side of the lower pressing head. According to the utility model, the sleeve disc is arranged, so that the lower pressing head can be quickly placed in the middle on the lifting table without influencing the disassembly and assembly speed; and by arranging the adjusting component, the position of the sample can be centered and corrected, so that the sample can be located at the relative central position during detection, the detection accuracy is improved, meanwhile, the problems of abrasion and potential safety hazards caused by the deflection of the position of the pressure head are avoided, and the service life of the device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of detection instruments, and particularly relates to a device for detecting the immersion residual Marshall stability of asphalt concrete. Background Art

[0002] The asphalt mixture Marshall tester is a device used to evaluate the stability and anti-plastic deformation ability of asphalt mixtures. By measuring the stability and fluidity of the mixture, this tester can be used for the stability evaluation and test of asphalt mixtures, providing a basis for the design of asphalt mixtures and the quality control of asphalt pavement construction.

[0003] During the test process of existing Marshall detectors, the centered placement of the asphalt sample is a key link to ensure the accuracy and reliability of the test. However, in actual operation, both the indenter and the sample are manually operated, which undoubtedly increases a certain risk of error. Due to the existence of human factors, even skilled operators may have slight deviations during the sample placement process, making the sample unable to be precisely centered between the indenters, thus affecting the detection accuracy; in addition, the non-centered sample is prone to uneven pressure distribution when subjected to the vertical pressure applied by the indenter, which not only affects the accuracy of the performance evaluation of the asphalt sample but may also cause unnecessary damage to the equipment. Over time, it will also lead to increased wear of the equipment, thereby affecting its service life. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for detecting the immersion residual Marshall stability of asphalt concrete to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A device for detecting the immersion residual Marshall stability of asphalt concrete includes a main body, two columns, a lifting platform, a lower indenter, and an upper indenter. A lifting component is arranged inside the main body, and the lifting platform is fixedly installed at the movable end of the lifting component. The lifting component is used to control the lifting of the lifting platform; a sleeve plate is fixedly connected to the bottom of the lower indenter, and the sleeve plate is placed on the lifting platform. Through holes are provided on the sleeve plate, and the inner wall of the sleeve plate fits with the outer side of the lower indenter. The upper indenter is placed on the top of the lower indenter, and guiding columns are arranged on the lower indenter; the two columns are symmetrically and fixedly connected to the top of the main body, and a top beam is fixedly connected between the tops of the columns. A calibration component is arranged on the outer side of the top beam, and the calibration is used to perform centering correction on the target to be detected; a force-bearing frame is fixedly connected to the bottom of the top beam, and a pressure sensor is fixedly installed at the bottom of the force-bearing frame; a displacement sensor is detachably connected to the upper indenter, and both the pressure sensor and this displacement sensor are electrically connected to a processor inside the main body; a protective component is arranged on the outer side of one of the columns, and the protective component is used to protect the detection part.

[0007] With the above technical solution, by setting the sleeve plate, the lower pressing head can be quickly centered on the lifting platform without affecting the disassembly and assembly speed; and by setting the adjusting component, the position of the sample can be centered and corrected so that the sample can be in a relatively central position during detection, thereby improving the detection accuracy and avoiding the problems of wear and safety hazards caused by the skewed position of the pressing head.

[0008] A further improvement of the technical solution of the present utility model lies in that: the alignment component includes two sliding seats and two movable blocks. The two sliding seats are symmetrically and fixedly connected to both sides of the top beam. A through groove is opened at the top of the sliding seat and extends to the bottom. A first sliding rod is fixedly connected between the inner walls of the through groove. A slider is slidably connected between the outer side of the first sliding rod and the inner wall of the through groove. A first spring is sleeved on the outer side of the first sliding rod. One side of the slider is fixedly connected with a transmission block. An alignment head is fixedly connected to the side of the movable block close to each other. A transmission frame is fixedly connected to the top of the movable block. The transmission block and the inner wall of the transmission frame slide in the vertical direction. A centering component is arranged on the top of the top beam. The centering component is used to center the adjustment position of the alignment component. The transmission frame is limited in the horizontal direction by the centering component and the sliding seat.

[0009] With the above technical solution, it is convenient to release the transmission frame in the area where the alignment heads are located on both sides of the two pressing heads, so that under the reset of the first spring, the slider is pushed to reset, and then the two corresponding alignment heads are driven to reset and center and squeeze the sample to adjust the position of the sample, and cooperate with the centering component to achieve centering adjustment.

[0010] A further improvement of the technical solution of the present utility model lies in that: the centering component includes a gear rotatably connected to the top of the top beam. Two fixing blocks are fixedly connected to the top of the top beam. A second sliding rod is arranged on the fixing block. The second sliding rod penetrates through the fixing block and is slidably connected to the fixing block. Follow-up blocks are fixedly connected to both ends of the second sliding rod. A rack is fixedly connected between the follow-up blocks. Some areas of the rack are toothless. The rack is meshed with the gear. One side of the rack is fixedly connected with the transmission block. Both sides of the transmission frame are respectively in contact with the sliding seat and the toothless part of the rack.

[0011] With the above technical solution, it is convenient to pull the transmission frame, so that the movable block and the alignment head at the bottom of the transmission frame both move to the side away from the storage cylinder. At the same time, the transmission frame drives one of the racks to move through the transmission block, and the gear rotates through meshing, and then drives the other rack to move synchronously, so that the alignment head on the other side can move at the same speed. The moving directions of the two alignment heads are opposite, so as to facilitate centering positioning.

[0012] A further improvement of the technical solution of the present utility model lies in that: storage cylinders are fixedly connected to both sides of the stress frame.

[0013] Adopting the above technical solution facilitates the storage of the centering head.

[0014] A further improvement of the technical solution of the present utility model lies in that: the protective component includes a second rotating ring, the second rotating ring is rotatably connected to the outside of the column, and a first rotating ring is also rotatably connected to the outside of the column. Flip frames are fixedly connected to the outside of both the first rotating ring and the second rotating ring, and one end of the flip frame is fixedly connected to a protective plate.

[0015] Adopting the above technical solution facilitates protecting the test position by flipping the protective plate to both sides of the displacement ram, reducing the situation of splashes generated during the high-voltage test causing harm to personnel.

[0016] A further improvement of the technical solution of the present utility model lies in that: a first jack is provided on the end face of the first rotating ring, a second jack is provided on the end face of the second rotating ring, a sliding ring is slidably connected to the outside of the column, a pin is fixedly connected to one side of the sliding ring, a fixed ring is fixedly connected to the outside of the column, and a second spring is sleeved on the outside of the column between the fixed ring and the sliding ring. The pin is used in cooperation with the first jack and the second jack. A strip-shaped limiting groove is provided on the outside of the column, and a limiting block is provided on the inner side of the sliding ring to cooperate with the strip-shaped limiting groove.

[0017] Adopting the above technical solution enables the sliding ring to slide along the axial direction of the column, compress the second spring, and at the same time drive the pin to leave the two jacks, so that the first rotating ring and the second rotating ring can rotate. The sliding ring can only slide axially along the column. When the pin is inserted into the two through holes, the two rotating rings can no longer rotate.

[0018] A further improvement of the technical solution of the present utility model lies in that: four first jacks and second jacks are equidistantly arranged on the end face.

[0019] Adopting the above technical solution enables the first jack and the second jack to face the pin again when the two flip frames (corresponding to the first rotating ring and the second rotating ring) are both flipped by 90 degrees.

[0020] Due to adopting the above technical solution, the technical progress achieved by the present utility model compared with the prior art is:

[0021] 1. The present utility model provides an asphalt concrete immersion residual Marshall stability detection device. By setting the sleeve plate, the lower ram can be quickly centered and placed on the lifting platform without affecting the disassembly and assembly speed; and by setting the adjusting component, the position of the sample can be centered and corrected, so that the sample can be in a relatively central position during detection, thereby improving the detection accuracy. At the same time, the problem of wear and safety hazards caused by the deviation of the ram position is avoided, and the service life of the device is improved.

[0022] 2. The utility model provides a detection device for the immersion residual Marshall stability of asphalt concrete. By setting a protection component, it is convenient to protect the test position by flipping the protection plate to both sides of the displacement indenter, reducing the situation that splashes generated during the high-pressure test cause harm to personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following further describes the present utility model with reference to the drawings.

[0024] Figure 1 It is a schematic structural diagram of the first perspective of the present utility model;

[0025] Figure 2 It is a schematic structural diagram of the second perspective of the present utility model;

[0026] Figure 3 It is a schematic diagram of the disassembled structure of the present utility model;

[0027] Figure 4 It is a schematic structural diagram of the upper indenter and the lower indenter of the present utility model;

[0028] Figure 5 It is a schematic structural diagram of the protection component of the present utility model;

[0029] Figure 6 For the present utility model Figure 1 The enlarged view at A in.

[0030] In the figure: 1, main body; 2, column; 3, top beam; 4, lifting platform; 5, lower indenter; 6, sleeve disc; 7, upper indenter; 8, sliding seat; 9, sliding groove; 10, first sliding rod; 11, slider; 12, first spring; 13, movable block; 14, centering head; 15, transmission frame; 16, transmission block; 17, through hole; 18, gear; 19, fixed block; 20, second sliding rod; 21, follower block; 22, rack; 23, force-bearing frame; 24, receiving cylinder; 25, first rotating ring; 26, second rotating ring; 27, flipping frame; 28, protection plate; 29, first jack; 30, second jack; 31, fixed ring; 32, sliding ring; 33, bolt; 34, second spring; 35, pressure sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following further describes the present utility model in detail with reference to the embodiments:

[0032] Embodiment 1

[0033] As Figures 1-6As shown in the figure, the utility model provides a device for detecting the residual Marshall stability of asphalt concrete after immersion, which includes a main body 1, two columns 2, a lifting platform 4, a lower pressure head 5 and an upper pressure head 7. A lifting component is arranged inside the main body 1. The lifting platform 4 is fixedly installed at the movable end of the lifting component, and the lifting component is used to lift the lifting platform 4 up and down. A sleeve plate 6 is fixedly connected to the bottom of the lower pressure head 5. The sleeve plate 6 is placed on the lifting platform 4. A through hole 17 is formed in the sleeve plate 6. The inner wall of the sleeve plate 6 fits with the outer side of the lower pressure head 5. The upper pressure head 7 is placed on the top of the lower pressure head 5. Guide columns are arranged on the lower pressure head 5. The two columns 2 are symmetrically and fixedly connected to the top of the main body 1. A top beam 3 is fixedly connected between the tops of the columns 2. A calibration component is arranged on the outer side of the top beam 3, and the calibration is used to center and correct the target to be detected. A force-bearing frame 23 is fixedly connected to the bottom of the top beam 3, and a pressure sensor 35 is fixedly installed at the bottom of the force-bearing frame 23. A displacement sensor is detachably connected to the upper pressure head 7. Both the pressure sensor 35 and the displacement sensor are electrically connected to a processor inside the main body 1. A protective component is arranged on the outer side of one of the columns 2, and the protective component is used to protect the detection part.

[0034] In this embodiment, by setting the sleeve plate 6, the lower pressure head 5 can be quickly centered and placed on the lifting platform 4, and at the same time, the disassembly and assembly speed is not affected. And by setting the adjustment component, the position of the sample can be centered and corrected, so that the sample can be in a relatively central position during detection, thereby improving the accuracy of detection. At the same time, the problems of wear and safety hazards caused by the deviation of the pressure head position are avoided, and the service life of the device is improved.

[0035] Embodiment 2

[0036] As Figure 2 and Figure 3 shown, on the basis of Embodiment 1, the utility model provides a technical solution: Preferably, the calibration component includes two sliding seats 8 and two movable blocks 13. The two sliding seats 8 are symmetrically and fixedly connected to both sides of the top beam 3. A through groove 9 penetrating from the top to the bottom is formed in the top of the sliding seat 8. A first sliding rod 10 is fixedly connected between the inner walls of the through groove 9. A slider 11 is slidably connected between the outer side of the first sliding rod 10 and the inner wall of the through groove 9. A first spring 12 is sleeved on the outer side of the first sliding rod 10. One side of the slider 11 is fixedly connected to a transmission block 16. An alignment head 14 is fixedly connected to the side of the movable block 13 close to each other. A transmission frame 15 is fixedly connected to the top of the movable block 13. The transmission block 16 slides vertically with the inner wall of the transmission frame 15. A centering component is arranged on the top of the top beam 3, and the centering component is used to adjust the position of the calibration component to be centered. The transmission frame 15 is limited in the horizontal direction by the centering component and the sliding seat 8.

[0037] In this embodiment, it is convenient to release the transmission frame 15 in the area on both sides of the centering head 14, so that under the reset of the first spring 12, the slider 11 is pushed to reset, and then the two corresponding centering heads 14 are driven to reset and centeringly squeeze the sample to adjust the position of the sample, and cooperate with the centering component to achieve centering adjustment.

[0038] Embodiment 3

[0039] As Figure 1 and Figure 6 shown, on the basis of Embodiment 2, the present utility model provides a technical solution: Preferably, the centering component includes a gear 18 rotatably connected to the top of the top beam 3. Two fixing blocks 19 are fixedly connected to the top of the top beam 3. A second sliding rod 20 is arranged on the fixing block 19. The second sliding rod 20 penetrates through the fixing block 19 and is slidably connected to the fixing block 19. Both ends of the second sliding rod 20 are fixedly connected with follower blocks 21. A rack 22 is fixedly connected between the follower blocks 21. Part of the area of the rack 22 is toothless. The rack 22 is meshed with the gear 18. One side of the rack 22 is fixedly connected to the transmission block 16. Both sides of the transmission frame 15 are respectively in contact with the sliding seat 8 and the toothless part of the rack 22.

[0040] In this embodiment, it is convenient to pull the transmission frame 15, so that the movable block 13 and the centering head 14 at the bottom of the transmission frame 15 both move to the side away from the receiving cylinder 24. At the same time, the transmission frame 15 drives one of the racks 22 to move through the transmission block 16, and makes the gear 18 move through meshing, and then drives the other rack 22 to move synchronously, so that the centering head 14 on the other side can move at the same speed. The moving directions of the two centering heads 14 are opposite, so as to facilitate centering positioning.

[0041] As Figure 1 and Figure 6 shown, preferably, receiving cylinders 24 are fixedly connected to both sides of the force-bearing frame 23.

[0042] In this embodiment, it is convenient to receive the centering head 14.

[0043] Embodiment 4

[0044] As Figure 3 and Figure 5 shown, on the basis of Embodiment 4, the present utility model provides a technical solution: Preferably, the protection component includes a second rotating ring 26, the second rotating ring 26 is rotatably connected to the outside of the column 2, and a first rotating ring 25 is also rotatably connected to the outside of the column 2. Flipping frames 27 are fixedly connected to the outside of both the first rotating ring 25 and the second rotating ring 26. One end of the flipping frame 27 is fixedly connected to a protection plate 28.

[0045] In this embodiment, it is convenient to protect the test position by flipping the protective plate 28 to both sides of the displacement indenter, reducing the situation of splashes generated during the high-voltage test from causing harm to personnel.

[0046] As Figure 3 and Figure 5 shown, preferably, a first jack 29 is provided on the end face of the first rotating ring 25, a second jack 30 is provided on the end face of the second rotating ring 26, a sliding ring 32 is slidably connected to the outside of the column 2, a pin 33 is fixedly connected to one side of the sliding ring 32, a fixed ring 31 is fixedly connected to the outside of the column 2, a second spring 34 is sleeved between the fixed ring 31 and the sliding ring 32 on the outside of the column 2, the pin 33 is used in cooperation with the first jack 29 and the second jack 30, a strip-shaped limiting groove is provided on the outside of the column 2, and a limiting block is provided on the inside of the sliding ring 32 to cooperate with the strip-shaped limiting groove.

[0047] In this embodiment, the sliding ring 32 can slide along the axial direction of the column 2, compress the second spring 34, and at the same time drive the pin 33 to leave the two jacks, so that the first rotating ring 25 and the second rotating ring 26 can rotate. The sliding ring 32 can only slide axially on the column 2. When the pin 33 is inserted into the two through holes 17, the two rotating rings can no longer rotate.

[0048] As Figure 5 shown, preferably, four first jacks 29 and four second jacks 30 are equidistantly arranged on the end face.

[0049] In this embodiment, when both flipping frames 27 (corresponding to the first rotating ring 25 and the second rotating ring 26) are flipped 90 degrees, the first jack 29 and the second jack 30 are again aligned with the pin 33.

[0050] Next, the working principle of the asphalt concrete immersed residual Marshall stability testing device will be specifically described.

[0051] As Figures 1-6 shown, before the test, the sample is first placed in an external water bath device for water bath. After the water bath is completed, the upper indenter 5 and the lower indenter 7 are first removed. That is, the lower indenter 5 is first lifted upward so that the sleeve plate 6 is separated from the lifting platform 4, and then it can be quickly removed and placed in the water bath pool for soaking for several seconds, so that the two indenters (referring to the upper indenter 5 and the lower indenter 7) themselves have a temperature, reducing the influence of temperature on the test results. After soaking is completed, the indenters are taken out and dried, and then placed back on the lifting platform 4 so that the sleeve plate 6 fits with the lifting platform 4 (during the above process, the centering head 14 is always in the receiving cylinder 24 and will not cause interference). At this time, the water-bathed sample can be quickly dried and placed between the two indenters;

[0052] After the preliminary work is completed, the transmission frame 15 can be pulled, so that the movable block 13 and the centering head 14 at the bottom of the transmission frame 15 both move to the side away from the storage cylinder 24. At the same time, the transmission frame 15 drives one of the racks 22 to move through the transmission block 16, and makes the gear 18 move through meshing, and then drives the other rack 22 to move synchronously, so that the centering head 14 on the other side can move at the same speed. The moving directions of the two centering heads 14 are opposite; leave the storage cylinder 24, and then slide the transmission frame 15 downward so that the centering head 14 can be located in the area on both sides of the two pressure heads. At this time, release the transmission frame 15, so that under the reset of the first spring 12, the slider 11 is pushed to reset, and then drives the two corresponding centering heads 14 to reset and centeringly squeeze the sample;

[0053] After the extrusion and centering are completed, quickly pull the transmission frame 15 in the same way and reset the transmission frame 15 upward. During this process, the test equipment main body 1 is turned on at the same time, and the centering head 14 is aligned with the storage cylinder 24 and then released, so that the centering head 14 is stored; during the test process, the lifting table 4 continuously rises, lifting the lower pressure head 5 until the upper pressure head 7 is lifted to contact the upper pressure sensor 35 above (and because the lifting speed of the lifting table 4 is slow, the time period before the upper pressure head 7 contacts the pressure sensor 35 is sufficient to store the centering head 14);

[0054] During the test process, the sliding ring 32 can be slid upward, so that the second spring 34 is squeezed, and the plug pin 33 is driven to leave the two jacks (the first jack 29 and the second jack 30), and then the flipping frame 27 can be rotated. After one of the flipping frames 27 is rotated, the two jacks start to be misaligned. At this time, the sliding seat 8 can be released, so that the plug pin 33 has a tendency to rebound; when both flipping frames 27 are flipped 90 degrees, at this time the first jack 29 and the second jack 30 are facing the plug pin 33 again, so that the plug pin 33 pops out under the action of the second spring 34 and is inserted between the first jack 29 and the second jack 30, so that the two protective plates 28 are in a parallel state and are located on both sides of the pressure head to protect it;

[0055] With the progress of the test, the displacement sensor and the pressure sensor 35 respectively detect the displacement amount and the corresponding pressure during the downward pressing process, and transmit the signals to the processor in the main body 1 to process the data and generate results.

[0056] The above generally describes the present utility model in detail, but based on the present utility model, some modifications or improvements can be made, which are obvious to those of ordinary skill in the art. Therefore, the modifications or improvements made without departing from the spirit of the present utility model are within the protection scope of the present utility model.

Claims

1. An apparatus for detecting the immersion residual Marshall stability of asphalt concrete, comprising a main body (1), two columns (2), a lifting platform (4), a lower pressing head (5) and an upper pressing head (7). A lifting component is arranged inside the main body (1). The lifting platform (4) is fixedly installed at the movable end of the lifting component, and the lifting component is used to lift the lifting platform (4) up and down. It is characterized in that: A sleeve plate (6) is fixedly connected to the bottom of the lower pressing head (5). The sleeve plate (6) is placed on the lifting table (4). A through hole (17) is formed in the sleeve plate (6). The inner wall of the sleeve plate (6) fits the outer side of the lower pressing head (5). The upper pressing head (7) is placed on the top of the lower pressing head (5). Guide columns are arranged on the lower pressing head (5). Two of the columns (2) are symmetrically and fixedly connected to the top of the main body (1). A top beam (3) is fixedly connected between the tops of the columns (2). A calibration component is arranged on the outer side of the top beam (3). The calibration is used to center and correct the target to be detected. A force-bearing frame (23) is fixedly connected to the bottom of the top beam (3). A pressure sensor (35) is fixedly installed at the bottom of the force-bearing frame (23). A displacement sensor is detachably connected to the upper pressing head (7). The pressure sensor (35) and the displacement sensor are both electrically connected to a processor inside the main body (1). A protective component is arranged on the outer side of one of the columns (2). The protective component is used to protect the detection part.

2. The asphalt concrete immersion residual Marshall stability detection device according to claim 1, wherein: The calibration component includes two sliding seats (8) and two movable blocks (13). The two sliding seats (8) are symmetrically and fixedly connected to both sides of the top beam (3). A through groove (9) penetrating from the top to the bottom is formed in the top of the sliding seat (8). A first sliding rod (10) is fixedly connected between the inner walls of the through groove (9). A slider (11) is slidably connected between the outer side of the first sliding rod (10) and the inner wall of the through groove (9). A first spring (12) is sleeved on the outer side of the first sliding rod (10). A transmission block (16) is fixedly connected to one side of the slider (11). A centering head (14) is fixedly connected to the side of the movable block (13) close to each other. A transmission frame (15) is fixedly connected to the top of the movable block (13). The transmission block (16) slides vertically with the inner wall of the transmission frame (15). A centering component is arranged on the top of the top beam (3). The centering component is used to adjust the position of the calibration component to be centered. The transmission frame (15) is limited horizontally by the centering component and the sliding seat (8).

3. An apparatus for detecting the immersion residual Marshall stability of asphalt concrete according to claim 2, characterized in that: The centering component includes a gear (18) rotatably connected to the top of the top beam (3). Two fixing blocks (19) are fixedly connected to the top of the top beam (3). A second sliding rod (20) is arranged on the fixing block (19). The second sliding rod (20) penetrates through the fixing block (19) and is slidably connected to the fixing block (19). Follow-up blocks (21) are fixedly connected to both ends of the second sliding rod (20). A rack (22) is fixedly connected between the follow-up blocks (21). Part of the area of the rack (22) has no teeth. The rack (22) is meshed with the gear (18). One side of the rack (22) is fixedly connected to the transmission block (16). The two sides of the transmission frame (15) are respectively in contact with the sliding seat (8) and the part of the rack (22) without teeth.

4. An asphalt concrete immersion residual Marshall stability detection device according to claim 3, characterized in that: Receiving cylinders (24) are fixedly connected to both sides of the force-bearing frame (23).

5. The asphalt concrete immersion residual Marshall stability detection device according to claim 4, characterized in that: The protective component includes a second rotating ring (26), the second rotating ring (26) is rotatably connected to the outside of the column (2), and a first rotating ring (25) is also rotatably connected to the outside of the column (2). Flip frames (27) are fixedly connected to the outside of both the first rotating ring (25) and the second rotating ring (26), and a protective plate (28) is fixedly connected to one end of the flip frame (27).

6. The asphalt concrete immersion residual Marshall stability detection device according to claim 5, characterized in that: A first insertion hole (29) is formed in the end face of the first rotating ring (25), a second insertion hole (30) is formed in the end face of the second rotating ring (26), a sliding ring (32) is slidably connected to the outside of the column (2), a latch (33) is fixedly connected to one side of the sliding ring (32), a fixed ring (31) is fixedly connected to the outside of the column (2), a second spring (34) is sleeved between the fixed ring (31) and the sliding ring (32) on the outside of the column (2), the latch (33) is used in cooperation with the first insertion hole (29) and the second insertion hole (30), a strip-shaped limiting groove is formed in the outside of the column (2), and a limiting block is arranged inside the sliding ring (32) to cooperate with the strip-shaped limiting groove.

7. An apparatus for detecting the residual Marshall stability of asphalt concrete after immersion according to claim 6, characterized in that: Four first insertion holes (29) and second insertion holes (30) are equidistantly arranged on the end face.

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