Expressway subgrade large-grained stone compaction test device and experimental method thereof

Abstract

The application relates to the technical field of highway subgrade, in particular to a highway subgrade large-grained stone ramming test device and a test method thereof, which comprises a compaction instrument body and further comprises a test tube. The highway subgrade large-grained stone ramming test device can accurately divide the large-grained stones to be tested into equal parts and push the equal parts into the test tube through an equal-portion layering assembly, so that the large-grained stone quantity poured into the test tube is ensured to be the same each time, and the test accuracy and repeatability are improved. The design of a fixing assembly ensures that the layering cylinder can keep the same axis with the test tube when the compaction instrument body compacts the large-grained stones in the test tube, which avoids uneven compaction caused by axis deviation and further improves the test result accuracy. The combination use of a driving piece and a limiting piece not only provides power for the rotation of the layering cylinder but also limits the rotation angle and rotation axis of the layering cylinder, so that the movement of the layering cylinder is more stable and controllable, and the test efficiency and accuracy are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of highway subgrade, in particular to a highway subgrade large-gravel compaction test device and a test method thereof. BACKGROUND

[0002] The highway subgrade large-gravel compaction test is a test of the compaction effect when large-gravel is used as the subgrade material in highway construction. The main purpose of the highway subgrade large-gravel compaction test is to verify the compaction effect of the large-gravel subgrade during the compaction process, so as to ensure that the bearing capacity and stability of the subgrade meet the design requirements. Through the test, the influence of different compaction parameters (such as compaction energy and compaction times) on the compaction degree of the large-gravel subgrade can be evaluated, thereby providing a theoretical basis and technical support for actual construction. The existing method for the highway subgrade large-gravel compaction test is to use a surface vibration compactor to vibrate and press the large-gravel in the test cylinder, so that the large-gravel fills the test cylinder and produces a compaction effect. Finally, the large-gravel in the test cylinder after compaction is detected.

[0003] However, in actual use, we found that when the staff pours the large-gravel into the test cylinder, the staff needs to pour the large-gravel into the test cylinder in three layers. The purpose is that the layered pouring and compaction can make the compaction degree of each layer of filler more uniform, so as to avoid the conditions of insufficient compaction or excessive compaction, thereby ensuring that the compaction quality of the subgrade meets the design requirements and improving the bearing capacity and stability of the subgrade. However, the amount of large-gravel poured into the test cylinder in three layers needs to be controlled by the staff through long-term work experience. If the large-gravel poured into the test cylinder in one of the three layers is too much, the uniformity of the large-gravel will be affected, which may lead to the conditions of insufficient compaction or excessive compaction, thereby affecting the measurement results. For staff without experience or staff with short working time, it is difficult to control the amount of large-gravel poured, thereby affecting the compaction quality of the large-gravel and the accuracy of the test data. Therefore, we propose a highway subgrade large-gravel compaction test device. SUMMARY

[0004] One technical problem to be solved by the present application is how to ensure that the amount of large-gravel poured into the test cylinder is not large in error when the staff does not have rich experience in the highway subgrade large-gravel compaction test.

[0005] To solve the above technical problems, the present application provides a highway subgrade large-gravel compaction test device, which comprises a compactor body, and further comprises

[0006] A test cylinder is arranged on the compactor body and is used to hold large-gravel for testing.

[0007] The layered cylinder is arranged on the compaction instrument body, and the layered cylinder is used to divide the large stones to be tested into equal parts;

[0008] The equal-portion layering assembly is arranged on one side of the test cylinder, and the equal-portion layering assembly is used to control the movement of the layered cylinder, drive the layered cylinder to push the large stones into the test cylinder, and drive the layered cylinder to pour the same amount of large stones into the test cylinder each time.

[0009] The fixing assembly is arranged on one side of the test cylinder, and the fixing assembly is used to fix the layered cylinder concentrically with the test cylinder when the compaction instrument body is compacting the large stones in the test cylinder.

[0010] In some embodiments, the equal-portion layering assembly includes a driving member arranged on one side of the layered cylinder, the driving member is used to provide power for the rotation of the layered cylinder, one side of the test cylinder is provided with a guide member, the guide member is used to guide the movement path of the layered cylinder, one side of the test cylinder is provided with a limiting member, the limiting member is used to limit the rotation angle and rotation axis of the layered cylinder, and a scraping member is arranged above the layered cylinder, the scraping member is used to scrape off the large stones above the layered cylinder.

[0011] In some embodiments, the driving member includes a driving plate arranged on one side of the layered cylinder, a driving shaft is arranged at the bottom of the driving plate, a driving handle is arranged outside the driving shaft, a fixing block is arranged on one side of the test cylinder close to the layered cylinder, the driving shaft is rotatably arranged in the fixing block, a torsional spring is arranged outside the driving shaft, and the other end of the torsional spring is arranged in the fixing block.

[0012] In some embodiments, the guide member includes a stand arranged on the compaction instrument body, a guide plate is arranged at the top of the stand, one end of the guide plate away from the stand is arranged outside the test cylinder, the guide plate is arc-shaped, the layered cylinder is arranged on and slides on the top of the guide plate, and a plurality of horizontal grooves are arranged on the top of the guide plate.

[0013] In some embodiments, the limiting member includes an extension rod arranged outside the driving shaft, a limiting rod is arranged at the top of the extension rod, a traction plate is arranged at the top of the limiting rod, a limiting groove matched with the limiting rod is arranged at the bottom of the fixing block, and a traction groove matched with the traction plate is arranged in the fixing block.

[0014] In some embodiments, the scraping member includes a support rod arranged on one side of the stand, the support rod is C-shaped, a scraping plate is arranged at one end of the support rod away from the stand, the scraping plate is arc-shaped, and the bottom of the scraping plate is attached to the top of the layered cylinder.

[0015] In some embodiments, the fixing assembly comprises a locking member arranged on one side of the test cylinder, which is used to fix the layered cylinder above the test cylinder when the compactor body needs to compact the large stones in the test cylinder; the one side of the test cylinder is provided with a switching member, which is used to switch the locking state of the layered cylinder.

[0016] In some embodiments, the locking member comprises a locking plate slidingly arranged outside the test cylinder, the top of the locking plate is beveled, the bottom of the locking plate is provided with a sliding rod, the outside of the test cylinder is provided with a locking rack, the sliding rod is slidingly arranged in the locking rack, the outside of the sliding rod is provided with a locking spring, one end of the locking spring is arranged at the bottom of the locking plate, and the other end of the locking spring is arranged at the top of the locking rack; the outside of the layered cylinder is provided with a locking groove matched with the locking plate.

[0017] In some embodiments, the switching member comprises a bearing arranged at the bottom of the sliding rod, the outer ring of the bearing is provided with a switching plate, the outside of the sliding rod is provided with a positioning plate, the outside of the test cylinder is provided with a switching rack, the switching rack is provided with a switching groove matched with the positioning plate and the switching plate, and each end of the positioning plate is provided with a magnet one, and each end of the switching plate is provided with a magnet two matched with the two magnets one.

[0018] A method for highway subgrade large stone compaction experiment:

[0019] S1: pour the large stones into the layered cylinder;

[0020] S2: pull the driving handle to drive the driving shaft to rotate;

[0021] S3: the layered cylinder passes through the scraper, and the excess large stones in the layered cylinder are scraped off;

[0022] S4: the layered cylinder reaches directly above the test cylinder, and the large stones in the layered cylinder fall into the test cylinder;

[0023] S5: loosen the driving handle, and the torsional spring controls the automatic resetting of the layered cylinder;

[0024] S6: pour the large stones into the layered cylinder again, and repeat the above steps;

[0025] S7: rotate the switching plate to drive the two magnets one to be adsorbed with the corresponding magnet two;

[0026] S8: pour the large stones into the layered cylinder again, and pull the driving handle;

[0027] S9: when the layered cylinder reaches directly above the test cylinder, the locking plate fixes the layered cylinder at the top of the test cylinder through the locking groove;

[0028] S10: The pneumatic compactor body compacts the large stones in the test cylinder.

[0029] The present application has at least the following advantages:

[0030] The equal-portion layering assembly can accurately divide the large stones to be tested into equal portions and push them into the test cylinder, which ensures that the amount of large stones poured into the test cylinder is the same each time, improving the accuracy and repeatability of the test. The design of the fixing assembly ensures that the layering cylinder and the test cylinder have the same axis when the compactor body compacts the large stones in the test cylinder, which avoids uneven compaction caused by axis deviation and further improves the accuracy of the test results. The combination of the driving member and the limiting member not only provides power for the rotation of the layering cylinder but also limits the rotation angle and axis of the layering cylinder, making the movement of the layering cylinder more stable and controllable and thus improving the efficiency and accuracy of the test. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0032] Figure 2 It is a schematic diagram of the structure of the equal-portion layering assembly of the present application;

[0033] Figure 3 It is a schematic diagram of the structure of the equal-portion layering assembly of the present application;

[0034] Figure 4 It is a schematic diagram of the structure of the equal-portion layering assembly of the present application;

[0035] Figure 5 It is a schematic diagram of the structure of the equal-portion layering assembly of the present application;

[0036] Figure 6 It is an exploded schematic diagram of the structure of the switching member of the present application;

[0037] Figure 7 It is a schematic diagram of the structure of the equal-portion layering assembly of the present application;

[0038] Figure 8 It is a schematic diagram of the structure of the equal-portion layering assembly of the present application;

[0039] Figure 9 It is a schematic diagram of the structure of the equal-portion layering assembly of the present application;

[0040] In the figure: 1, compaction apparatus body; 2, test tube; 3, layered cylinder; 4, equal layered assembly; 5, fixed assembly; 6, driving piece; 61, driving plate; 62, driving shaft; 63, driving handle; 64, fixed block; 65, torsional spring; 7, guide piece; 71, stand; 72, guide plate; 73, transverse groove; 8, limiting piece; 81, extension rod; 82, limiting rod; 83, traction plate; 84, limiting groove; 85, traction groove; 9, scraping piece; 91, support rod; 92, scraper; 10, locking piece; 101, lock plate; 102, sliding rod; 103, locking bracket; 104, locking spring; 105, lock groove; 11, switching piece; 111, bearing; 112, switching plate; 113, positioning plate; 114, switching bracket; 115, switching groove; 116, magnet one; 117, magnet two. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] Embodiment 1: please refer to Figures 1-9 The present application provides a technical solution: a highway subgrade large-grained stone compaction test device, comprising a compaction apparatus body 1, further comprising

[0043] The test tube 2 is arranged on the compaction apparatus body 1, and the test tube 2 is used to hold large-grained stones for testing;

[0044] The layered cylinder 3 is arranged on the compaction apparatus body 1, and the layered cylinder 3 is used to equally divide the large-grained stones to be tested;

[0045] The equal layered assembly 4 is arranged on one side of the test tube 2, and the equal layered assembly 4 is used to control the movement of the layered cylinder 3, to drive the layered cylinder 3 to equally push the large-grained stones into the test tube 2, and to drive the layered cylinder 3 to pour the same amount of large-grained stones into the test tube 2 each time;

[0046] The fixed assembly 5 is arranged on one side of the test tube 2, and when the compaction apparatus body 1 is performing compaction work on the large-grained stones in the test tube 2, the fixed assembly 5 is used to fix the layered cylinder 3 concentrically with the test tube 2.

[0047] The equal-portion layering assembly 4 comprises a driving member 6 arranged on one side of the layering cylinder 3, which provides power for the rotation of the layering cylinder 3; a guide member 7 arranged on one side of the test cylinder 2, which guides the movement path of the layering cylinder 3; a limiting member 8 arranged on one side of the test cylinder 2, which limits the rotation angle and rotation axis of the layering cylinder 3; and a scraping member 9 arranged above the layering cylinder 3, which scrapes off large stones exceeding the layering cylinder 3.

[0048] The driving member 6 comprises a driving plate 61 arranged on one side of the layering cylinder 3, a driving shaft 62 arranged at the bottom of the driving plate 61, a driving handle 63 arranged on the outer side of the driving shaft 62, a fixed block 64 arranged on one side of the test cylinder 2 close to the layering cylinder 3, and the driving shaft 62 is rotatably arranged in the fixed block 64. A torsional spring 65 is arranged on the outer side of the driving shaft 62 and the other end of the torsional spring 65 is arranged in the fixed block 64. When the driving handle 63 is operated to drive the driving plate 61 and the driving shaft 62 to rotate, the elastic force of the torsional spring 65 can provide a reset power for the driving shaft 62, so that the layering cylinder 3 can be accurately reset after completing the pushing action, thereby facilitating the equal-portion layering operation next time.

[0049] The guide member 7 comprises a stand 71 arranged on the compaction instrument body 1, a guide plate 72 arranged at the top of the stand 71, and the end of the guide plate 72 away from the stand 71 is arranged on the outer side of the test cylinder 2. The guide plate 72 is arc-shaped, the layering cylinder 3 is attached to and slides on the top of the guide plate 72, and a plurality of transverse grooves 73 are arranged on the top of the guide plate 72. When the layering cylinder 3 rotates under the action of the driving member 6, the bottom of the layering cylinder 3 can slide along the arc-shaped path on the top of the guide plate 72. The arrangement of the transverse grooves 73 can make the large stones in the layering cylinder 3 turn over when they contact the large stones, thereby ensuring that the large stones can fill every corner of the layering cylinder 3.

[0050] The limiting member 8 comprises an extension rod 81 arranged on the outer side of the driving shaft 62, a limiting rod 82 arranged at the top of the extension rod 81, a traction plate 83 arranged at the top of the limiting rod 82, a limiting groove 84 arranged at the bottom of the fixed block 64 and matched with the limiting rod 82, and a traction groove 85 arranged in the fixed block 64 and matched with the traction plate 83. When the driving shaft 62 rotates, the extension rod 81 rotates, the limiting rod 82 slides in the limiting groove 84, and the driving shaft 62 rotates stably and is controlled. At the same time, the traction plate 83 slides in the traction groove 85, which provides additional support and guidance for the limiting rod 82 to prevent it from deviating or shaking during rotation. This design not only enhances the stability of the structure, but also ensures the accuracy and reliability of the equal-portion layering operation.

[0051] The scraping member 9 comprises a support rod 91 arranged on one side of the column 71, the support rod 91 is C-shaped, and the end of the support rod 91 away from the column 71 is provided with a scraping plate 92, the scraping plate 92 is arc-shaped, and the bottom of the scraping plate 92 is attached to the top of the layering cylinder 3, which can scrape off the large stones exceeding the layering cylinder 3 when the layering cylinder 3 passes through the scraping plate 92, so as to ensure that the amount of large stones poured into the test cylinder 2 is the same each time, which improves the test efficiency and also improves the accuracy of transporting large stones each time.

[0052] The fixing assembly 5 comprises a locking member 10 arranged on one side of the test cylinder 2, which is used to fix the layering cylinder 3 above the test cylinder 2 when the compaction instrument body 1 needs to compact the large stones in the test cylinder 2, and one side of the test cylinder 2 is provided with a switching member 11 which is used to switch the locking state of the layering cylinder 3.

[0053] The locking member 10 comprises a locking plate 101 which is slidingly arranged outside the test cylinder 2, and the top of the locking plate 101 is inclined, and the bottom of the locking plate 101 is provided with a sliding rod 102, the outside of the test cylinder 2 is provided with a locking rack 103, the sliding rod 102 is slidingly arranged in the locking rack 103, the outside of the sliding rod 102 is provided with a locking spring 104, one end of the locking spring 104 is arranged at the bottom of the locking plate 101, and the other end of the locking spring 104 is arranged at the top of the locking rack 103, and the outside of the layering cylinder 3 is provided with a locking groove 105 which is matched with the locking plate 101, which is used to slide the locking plate 101 along the outside of the test cylinder 2 when the locking plate 101 is subjected to external force, such as before the compaction instrument body 1 compacts the layering cylinder 3, the inclined top of the locking plate 101 enables the locking plate 101 to smoothly slide into the locking groove 105 outside the layering cylinder 3, realizing quick and stable fixation of the layering cylinder 3 and the test cylinder 2, at the same time, the sliding rod 102 at the bottom of the locking plate 101 slides in the locking rack 103 and is subjected to the elastic force of the locking spring 104, keeping the locking plate 101 and the locking groove 105 in close cooperation, preventing the layering cylinder 3 from shaking or falling off during the compaction operation, and ensuring the accuracy and safety of the test, when the magnets two 117 at both ends of the switching plate 112 are not attracted by the magnets one 116 at both ends of the positioning plate 113, the locking plate 101 is always located below the test cylinder 2 and will not contact the rotating layering cylinder 3, thereby ensuring the smoothness and continuity of the transportation during the first two times of layering large stones, and the design of the locking member 10 not only is simple to operate, but also greatly improves the stability and reliability of the test.

[0054] The switching piece 11 comprises a bearing 111 arranged at the bottom of the sliding rod 102, an outer ring of the bearing 111 is provided with a switching plate 112, the outer side of the sliding rod 102 is provided with a positioning plate 113, the outer side of the test cylinder 2 is provided with a switching frame 114, the switching frame 114 is provided with a switching groove 115 which is matched with the positioning plate 113 and the switching plate 112, the two ends of the positioning plate 113 are provided with a magnet one 116, and the two ends of the switching plate 112 are provided with a magnet two 117 which is matched with the two magnet ones 116, so that when it is needed to fix the layered cylinder 3 on the top of the test cylinder 2, the switching plate 112 is rotated along the bottom of the switching frame 114 by rotating the switching plate 112, at this time, the bearing 111 arranged at the outer side of the sliding rod 102 can ensure the stability of the switching process, the magnet two 117 at the two ends of the switching plate 112 gradually approaches the magnet one 116 at the two ends of the positioning plate 113, when the two are adsorbed, the top of the switching plate 112 is completely attached to the bottom of the positioning plate 113, at this time, the positioning plate 113 and the switching plate 112 are slid out of the switching groove 115 and are blocked by the locking frame 103, and the lock plate 101 arranged at the top of the sliding rod 102 is popped out of the test cylinder 2 under the action of the locking spring 104, so as to fix the layered cylinder 3 on the top of the test cylinder 2.

[0055] In use, when the staff needs to divide the test large particles into three equal parts and pour them into the test cylinder 2, the large particles are first poured into the layered cylinder 3, and the large particles poured into the layered cylinder 3 can slightly overflow and cannot be lower than the top of the layered cylinder 3, and then the driving handle 63 is pulled, when the staff pulls the driving handle 63, the driving handle 63 drives the driving shaft 62 to rotate, when the driving shaft 62 rotates, the driving plate 61 arranged at the top of the driving shaft 62 drives the layered cylinder 3 at one end to move, so that the layered cylinder 3 rotates around the driving shaft 62 as the axis, when the layered cylinder 3 rotates, the bottom of the layered cylinder 3 slides on the top of the guide plate 72 and passes below the scraping plate 92, the transverse groove 73 arranged on the guide plate 72 can increase the friction between the large particles in the layered cylinder 3 and the transverse groove 73 and generate vibration when the large particles in the layered cylinder 3 are pushed to move, so as to make the large particles in the layered cylinder 3 completely fill the space in the layered cylinder 3, when the layered cylinder 3 passes below the scraping plate 92, the scraping plate 92 scrapes off the large particles exceeding the top of the layered cylinder 3, so as to ensure that the amount of large particles pushed by the layered cylinder 3 is consistent each time, when the layered cylinder 3 continues to rotate, the limiting rod 82 slides in the limiting groove 84, so as to ensure that the angle of rotation of the layered cylinder 3 is accurately controlled, and at the same time, the traction plate 83 slides in the traction groove 85, so as to further enhance the stability of the structure;

[0056] In the initial state, the locking plate 101 is fixed on one side of the test cylinder 2 by the sliding rod 102 under the action of the switching plate 112, and cannot exceed the test cylinder 2, thereby not affecting the normal conveying of the large stone in the layered cylinder 3. When the layered cylinder 3 pours the large stone into the test cylinder 2 along the guide plate 72, and after pouring two portions, the switching plate 112 is rotated to make the two magnets 117 on the ends of the switching plate 112 adsorb the magnet 116 on the positioning plate 113, and ensure that the switching plate 112 can pass through the switching groove 115 together with the positioning plate 113. At this time, the locking spring 104 will push the locking plate 101 upwards, and the locking plate 101 will drive the sliding rod 102 to move upwards together, thereby making the positioning plate 113 at the bottom of the locking plate 101 and the switching plate 112 outside the bearing 111 move upwards together until the top of the positioning plate 113 is attached to the bottom of the locking frame 103, and then the third portion of the large stone can be conveyed;

[0057] When the layered cylinder 3 is rotated to the upper side of the test cylinder 2, due to the slope design at the top of the locking plate 101, the locking plate 101 will smoothly slide into the locking groove 105 outside the layered cylinder 3 to realize the rapid fixation of the layered cylinder 3. At this time, the three portions of the large stone in the layered cylinder 3 have been accurately poured into the test cylinder 2. Subsequently, when the compaction instrument body 1 compacts the large stone in the test cylinder 2, the fixing assembly 5 ensures that the layered cylinder 3 is stable and does not move, thereby preventing the large stone from moving during the compaction process, and ensuring the accuracy and reliability of the test results. The whole device is designed ingeniously and is easy to operate, which greatly improves the efficiency and precision of the highway subgrade large stone compaction test.

[0058] A highway subgrade large stone compaction test method:

[0059] S1: Pour the large stone into the layered cylinder;

[0060] S2: Pull the drive handle to drive the drive shaft to rotate;

[0061] S3: The layered cylinder passes through the scraper, and the large stone exceeding the layered cylinder is scraped off;

[0062] S4: The layered cylinder reaches directly above the test cylinder, and the large stone in the layered cylinder falls into the test cylinder;

[0063] S5: Loosen the drive handle, and the torsional spring controls the automatic resetting of the layered cylinder;

[0064] S6: Pour the large stone into the layered cylinder again, and repeat the above steps;

[0065] S7: Rotate the switching plate to drive the two magnets to adsorb the corresponding magnets;

[0066] S8: Pour the large stone into the layered cylinder again, and pull the drive handle;

[0067] S9: When the layered cylinder reaches directly above the test cylinder, the locking plate fixes the layered cylinder on the top of the test cylinder through the locking slot;

[0068] S10: The pneumatic compactor body compacts the large stones in the test cylinder.

[0069] It is to be noted that the relative terms such as first and second, and the like, are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any actual such relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0070] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the principles and spirit of the application.

Claims

1. A highway subgrade large-grained stone compaction test device, comprising a compactor body (1), characterized in that: Also included are Test cylinder (2), provided on the compaction instrument body (1), using the test cylinder (2) to hold the test large stone; Layering cylinder (3), provided on the compaction instrument body (1), using the layering cylinder (3) to divide the test large stone into equal parts; The equal layering assembly (4) is provided on one side of the test cylinder (2), which controls the movement of the layering cylinder (3) and drives the layering cylinder (3) to push the large stone into the test cylinder (2), and drives the layering cylinder (3) to pour the same amount into the test cylinder (2) each time; The fixing assembly (5) is provided on one side of the test cylinder (2), and the compaction instrument body (1) is used to fix the layering cylinder (3) concentrically with the test cylinder (2) when the compaction instrument body (1) is used to compact the large stone in the test cylinder (2); The equal layering assembly (4) includes a driving member (6) provided on one side of the layering cylinder (3), which provides power for the rotation of the layering cylinder (3), a guide member (7) provided on one side of the test cylinder (2), which guides the movement path of the layering cylinder (3), a limiting member (8) provided on one side of the test cylinder (2), which limits the rotation angle and rotation axis of the layering cylinder (3), and a scraping member (9) provided above the layering cylinder (3), which scrapes the large stone above the layering cylinder (3).

2. The highway subgrade large stone compaction test device according to claim 1, characterized in that: The driving member (6) includes a driving plate (61) provided on one side of the layering cylinder (3), a driving shaft (62) provided at the bottom of the driving plate (61), a driving handle (63) provided on the outer side of the driving shaft (62), a fixed block (64) provided on one side of the test cylinder (2) close to the layering cylinder (3), the driving shaft (62) is rotatably arranged in the fixed block (64), a torsional spring (65) is provided on the outer side of the driving shaft (62), and the other end of the torsional spring (65) is arranged in the fixed block (64).

3. The highway subgrade large stone compaction test device according to claim 2, characterized in that: The guide member (7) includes a stand (71) provided on the compaction instrument body (1), a guide plate (72) provided at the top of the stand (71), the guide plate (72) is provided on the outer side of the test cylinder (2) away from the stand (71), and the guide plate (72) is arc-shaped, the layering cylinder (3) is arranged on the top of the guide plate (72) in a pasting and sliding manner, and a plurality of transverse grooves (73) are formed in the top of the guide plate (72).

4. The highway subgrade large stone compaction test device according to claim 3, characterized in that: The limiting member (8) includes an extension rod (81) provided on the outer side of the driving shaft (62), a limiting rod (82) provided at the top of the extension rod (81), a traction plate (83) provided at the top of the limiting rod (82), a limiting groove (84) provided at the bottom of the fixed block (64) and matched with the limiting rod (82), and a traction groove (85) provided in the fixed block (64) and matched with the traction plate (83).

5. The highway subgrade large stone compaction test device according to claim 4, characterized in that: The scraping member (9) comprises a support rod (91) arranged on one side of the column (71), the support rod (91) is in a C shape, and the support rod (91) is provided with a scraper (92) at an end away from the column (71), the scraper (92) is in an arc shape, and the bottom of the scraper (92) is attached to the top of the layering cylinder (3).

6. The highway subgrade large stone compaction test device according to claim 5, characterized in that: The fixing assembly (5) comprises a locking member (10) arranged on one side of the test cylinder (2), the layering cylinder (3) is fixed above the test cylinder (2) when the compaction instrument body (1) needs to carry out tamping work on large stones in the test cylinder (2), and one side of the test cylinder (2) is provided with a switching member (11) for switching the locking state of the layering cylinder (3).

7. The highway subgrade large stone compaction test device according to claim 6, characterized in that: The locking member (10) comprises a locking plate (101) slidingly arranged on the outside of the test cylinder (2), the top of the locking plate (101) is beveled, the bottom of the locking plate (101) is provided with a sliding rod (102), the outside of the test cylinder (2) is provided with a locking rack (103), the sliding rod (102) is slidingly arranged in the locking rack (103), the outside of the sliding rod (102) is provided with a locking spring (104), one end of the locking spring (104) is arranged at the bottom of the locking plate (101), and the other end of the locking spring (104) is arranged at the top of the locking rack (103), and the outside of the layering cylinder (3) is provided with a locking groove (105) matched with the locking plate (101).

8. The highway subgrade large stone compaction test device according to claim 7, characterized in that: The switching member (11) comprises a bearing (111) arranged at the bottom of the sliding rod (102), the outer ring of the bearing (111) is provided with a switching plate (112), the outside of the sliding rod (102) is provided with a positioning plate (113), the outside of the test cylinder (2) is provided with a switching rack (114), the switching rack (114) is provided with a switching groove (115) matched with the positioning plate (113) and the switching plate (112), and the two ends of the positioning plate (113) are provided with a magnet I (116), and the two ends of the switching plate (112) are provided with a magnet II (117) matched with the two magnet Is (116).

9. A method of using the device for testing the compaction of large stones in the roadbed of a highway according to claim 8, characterized in that: The method comprises the following steps: S1: large stones are poured into the layering cylinder; S2: the driving handle is pulled to drive the driving shaft to rotate; S3: the layering cylinder passes through the scraper, and the part of the large stones exceeding the layering cylinder is scraped off; S4: the layering cylinder reaches directly above the test cylinder, and the large stones in the layering cylinder fall into the test cylinder; S5: the driving handle is loosened, and the torsional spring controls the layering cylinder to automatically reset; S6: the large stones are poured into the layering cylinder again, and the above steps are repeated; S7: the switching plate is rotated to drive the two magnet Is to be adsorbed to the corresponding magnet II; S8: the large stones are poured into the layering cylinder again, and the driving handle is pulled; S9: when the layering cylinder reaches directly above the test cylinder, the locking plate fixes the layering cylinder on the top of the test cylinder through the locking groove; and S10: the pneumatic compaction instrument body is used to carry out compaction work on the large stones in the test cylinder. ​ ​ ​ ​ ​ ​ ​ ​ ​

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