A compaction tester used in the study of soil moisture content in roadbed

Abstract

The present invention relates to the field of compaction for studying soil moisture content, and specifically discloses a compaction tester for studying soil moisture content of roadbed. The height of the weight in the existing device does not change with the thickness of the soil, resulting in errors in the test process. The device comprises a frame; a compaction hammer, which is slidably connected to the frame, and the upper side of the compaction hammer is slidably connected to a drag frame; a receiving platform, which is fixed to the frame, and the receiving platform is used to control the drag frame to stop moving at a fixed position; and a transmission mechanism, which is arranged in the frame. The present invention detects the thickness of the sample by the relative movement of the compaction hammer and the drag frame, and then ensures that the compaction hammer always moves upward to a specific distance from the upper surface of the sample through the transmission mechanism, so as to ensure that the compaction hammer has the same compaction strength for samples of different thicknesses, thereby reducing the error in compaction strength caused by the soil thickness factor during the test process.

Description

Technical Field

[0001] The invention relates to the field of soil moisture content research and compaction, and specifically discloses a compaction tester applied to roadbed soil moisture content research. Background Art

[0002] Soil compaction test is an indispensable project in soil moisture research. It is often used to test the compaction density of different soils under different moisture contents after being compacted with a certain force and a certain number of times. In the soil compaction test, water is first added to the soil to be tested, and then the soil to be tested is gradually added to the material bucket. The soil is compacted by allowing the heavy hammer to fall freely downward at a specific height (to ensure that the strength of each compaction is equal), simulating the actual situation of workers using a vibrating rammer to compact the soil under construction conditions. Finally, after the soil is taken out, the density of the soil in a specific volume and the water content in the soil are tested at the same time to obtain To obtain test data, in order to ensure uniform pressure distribution in the compacted test block, the soil is usually added into the material bucket in three to five portions and compacted in layers. This causes the soil thickness in the material bucket to gradually thicken as the compaction test progresses, while the height at which the heavy hammer falls does not change. Therefore, in fact, the impact strength of the heavy hammer on each layer of soil is different. The impact strength of the soil on the lower side is greater, while the impact strength of the soil on the upper side is less, and there is an error between the two. When considering that there is still an error in the amount of compacted soil added in each portion, the error between the impact strength of the heavy hammer on the soil in different positions will be further amplified. Summary of the invention

[0003] In order to overcome the disadvantage that the height of the weight in the existing device does not change with the thickness of the soil, resulting in errors in the test process, the present invention provides a compaction tester for studying the moisture content of roadbed soil.

[0004] The technical solution of the present invention is: a compaction tester applied to the research of water content of roadbed soil, comprising a frame, on which a rotating device is installed, and the rotating device is used to receive and drive the sample to rotate;

[0005] A compacting hammer is slidably connected to the frame and is located on the upper side of the rotating device. A dragging frame is slidably connected to the upper side of the compacting hammer, and the dragging frame is used to measure the thickness of the sample;

[0006] A receiving platform is fixedly connected to the frame, and the receiving platform is used to control the dragging frame to stop moving at a fixed position;

[0007] A transmission mechanism is arranged in the frame and is used to drive the hammer and the drag frame to move upward a specific distance.

[0008] Preferably, the receiving platform is slidably connected to a receiving block, and the dragging frame and the receiving platform are both in contact and cooperation with the receiving block, thereby limiting the dragging frame, and a first elastic member is installed between the receiving platform and the receiving block, and the first elastic member is used to buffer the dragging frame.

[0009] Preferably, the transmission mechanism comprises:

[0010] A transmission device is installed in the frame, and is used to drive the components thereon to reciprocate;

[0011] A fixed block is fixedly connected to the transmission device, a one-way gear is installed on the fixed block, a lifting plate is fixedly connected to the one-way gear, and the lifting plate is pressed and matched with the dragging frame to drive the dragging frame to move upward;

[0012] A control assembly is arranged in the frame and is used to control the rotation of the one-way gear, thereby releasing the cooperation between the lifting plate and the dragging frame.

[0013] Preferably, there is damping between the fixed block and the one-way gear to prevent the one-way gear from rotating freely.

[0014] Preferably, the control component comprises:

[0015] A fixed frame, fixedly connected in the frame, the fixed frame is slidably connected with a sliding block, the sliding block is fixedly connected with a first rack, the first rack is located at the upper part of the dragging frame, and the first rack is matched with the one-way gear transmission;

[0016] A first hydraulic telescopic rod is fixedly connected in the frame, a telescopic end of the first hydraulic telescopic rod is slidably connected to the sliding block, and a second elastic member is installed between the telescopic end of the first hydraulic telescopic rod and the sliding block;

[0017] A second hydraulic telescopic rod is fixedly connected to the hammer, a telescopic end of the second hydraulic telescopic rod is fixedly connected to the towing frame, and the second hydraulic telescopic rod is connected to the first hydraulic telescopic rod through a hose;

[0018] A limiting component is arranged in the frame and is used for limiting the sliding block.

[0019] Preferably, the capacity and diameter of the second hydraulic telescopic rod are respectively equal to the capacity and diameter of the first hydraulic telescopic rod.

[0020] Preferably, the limiting assembly comprises:

[0021] A limit plate is slidably connected in the frame, the limit plate is limitedly matched with the sliding block, and a third elastic member is installed between the limit plate and the frame;

[0022] The extrusion plate is rotatably connected in the frame, the extrusion plate is extruded and matched with the limiting plate, and the extrusion plate is extruded and matched with the fixing block.

[0023] Preferably, a bending portion is provided at the contact point between the limiting plate and the extrusion plate, and the bending portion is used to prevent the contact point between the extrusion plate and the limiting plate from moving to the upper side of the limiting plate.

[0024] Preferably, the control component further comprises:

[0025] The second rack is fixedly connected to the fixing frame, and the second rack is in driving cooperation with the one-way gear.

[0026] The beneficial effects of the present invention are as follows: the present invention detects the thickness of the sample through the relative movement of the compacting hammer and the dragging frame, and then ensures that the compacting hammer always moves upward to a specific distance from the upper surface of the sample through a transmission mechanism, thereby ensuring that the compacting hammer always has the same impact force on samples of different thicknesses, reducing the error in impact force caused by soil thickness factors during the test process, and ensuring that the rising distance of the first rack is equal to the thickness of the sample through the first hydraulic telescopic rod and the second hydraulic telescopic rod, thereby automatically and accurately regulating the rising distance of the compacting hammer, thereby increasing the accuracy of the compaction test performed by the device, making the test block compacted by the device closer to the soil compacted by a vibrating rammer on the construction site, and thereby making the test block compacted by the device more representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a special state diagram of the frame, the hammer and the transmission device of the present invention;

[0029] Figure 3 It is a three-dimensional structural schematic diagram of the frame, the hammer and the receiving platform of the present invention;

[0030] Figure 4 It is an exploded view of the hammer, the dragging frame and the receiving platform of the present invention;

[0031] Figure 5 It is a three-dimensional structural schematic diagram of the frame, the drag frame and the transmission device of the present invention;

[0032] Figure 6 It is a three-dimensional structural schematic diagram of the transmission device, the fixing frame and the first hydraulic telescopic rod of the present invention;

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the fixing frame, the first rack and the second rack of the present invention;

[0034] Figure 8 It is a schematic diagram of the three-dimensional structure of the fixing frame, the limiting plate and the extrusion plate of the present invention.

[0035] Markings in the figure are: 1-frame, 101-rotating device, 102-material barrel, 103-control terminal, 2-striking hammer, 3-dragging frame, 4-receiving platform, 41-receiving block, 42-first elastic member, 5-transmission device, 51-fixed block, 52-one-way gear, 53-lifting plate, 6-fixed frame, 61-sliding block, 62-first rack, 63-second rack, 7-first hydraulic telescopic rod, 71-second elastic member, 8-second hydraulic telescopic rod, 9-limiting plate, 91-third elastic member, 92-extrusion plate. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] Example 1: In the compaction test, soil is usually added gradually into the material barrel. This results in different impact forces applied to soil at different heights when the heavy hammer falls downward from the initial drop point and lands on the soil at different stages of the compaction test. This will cause differences in internal pressure at different positions in the same test block. When making different test blocks, if the amount of soil added at a single time is different, the impact forces applied to the same height positions of different test blocks may be inconsistent, which will undoubtedly increase the errors between the soil density and moisture content at different positions in different test blocks, resulting in larger errors in the test results.

[0038] In view of the above problems, the present invention proposes a compaction tester for studying the moisture content of roadbed soil. Figure 1-Figure 5 As shown, it includes a frame 1, a compacting hammer 2, a receiving platform 4 and a transmission mechanism.

[0039] In this embodiment, a rotating device 101 and a control terminal 103 are installed on the frame 1. The rotating device 101 is electrically connected to the control terminal 103. A material bucket 102 is installed on the frame 1 by bolts. The material bucket 102 is used to hold compacted soil. When the rotating device 101 is powered on, it drives the material bucket 102 and the sample therein to rotate intermittently in a certain pattern so as to compact the soil at different positions.

[0040] The compacting hammer 2 is slidably connected to the frame 1 and is located on the upper side of the rotating device 101. The compacting hammer 2 compacts the soil on the lower side by free fall. The upper side of the compacting hammer 2 is slidably connected to the drag frame 3. The drag frame 3 is slidably connected to the frame 1 to improve the stability of the up and down movement of the drag frame 3. The thickness of the sample is determined by measuring the relative sliding distance between the drag frame 3 and the compacting hammer 2.

[0041] The receiving platform 4 is slidably connected with a receiving block 41, and the dragging frame 3 and the receiving platform 4 are both in contact with the receiving block 41. The receiving platform 4 limits the dragging frame 3 through the receiving block 41. The receiving block 41 cooperates with the receiving platform 4 to block the dragging frame 3 from moving downward at a fixed position, thereby measuring the relative movement distance between the dragging frame 3 and the hammer 2. A first elastic member 42 is installed between the receiving platform 4 and the receiving block 41. The first elastic member 42 is a tension spring, which is used to buffer the dragging frame 3 and reduce the dragging frame 3, the receiving platform 4 and the receiving block 4. 1, thereby extending the service life of the device. The elastic force of the first elastic member 42 is less than the gravity of the drag frame 3, ensuring that when the drag frame 3 squeezes the receiving block 41 and moves downward, the drag frame 3 finally squeezes the receiving block 41 to a state of complete fit with the receiving platform 4, thereby reducing the time for the drag frame 3 to reciprocate up and down under the action of the receiving block 41 and the first elastic member 42, and increasing the tightness of the fit between the components of the device. The receiving platform 4 is used to control the drag frame 3 to stop moving at a fixed position, and the device is in Figure 2 In the internal state, because the distance between the contact point of the dragging frame 3 and the receiving block 41 to the bottom of the compacting hammer 2 is equal to the distance between the upper surface of the receiving block 41 and the upper surface of the rotating device 101, when the compacting hammer 2 is in contact with the soil layer and is squeezed by the soil layer and cannot contact the rotating device 101, relative sliding occurs between the dragging frame 3 and the compacting hammer 2. When the dragging frame 3 stops moving downward by squeezing the receiving block 41 and the receiving platform 4, the relative sliding distance between the dragging frame 3 and the compacting hammer 2 is exactly equal to the thickness of the soil layer. The thickness of the soil layer is determined by the relative sliding distance between the dragging frame 3 and the compacting hammer 2, thereby increasing the accuracy of the device.

[0042] The transmission mechanism is arranged in the frame 1, and is used to drive the compacting hammer 2 and the drag frame 3 to move upward a specific distance according to the measured thickness of the soil layer, so as to ensure that the impact force of the compacting hammer 2 on the soil remains unchanged.

[0043] refer to Figure 5-Figure 7As shown, the transmission mechanism includes a transmission device 5, a fixed block 51 and a control component. The transmission device 5 is installed in the frame 1 and is electrically connected to the control terminal 103. The transmission device 5 can be a sprocket chain, or a pulley belt or other devices for driving the parts thereon to rotate. The transmission device 5 drives the fixed block 51 and the parts thereon to rotate reciprocally, thereby reciprocatingly lifting the hammer 2 and the drag frame 3, and then determines the timing for the hammer 2 and the drag frame 3 to fall downward through the control component.

[0044] The fixed block 51 is fixedly connected to the transmission device 5, and a one-way gear 52 is installed on the fixed block 51. There is a damping between the fixed block 51 and the one-way gear 52 to prevent the one-way gear 52 from rotating freely. The one-way gear 52 is fixedly connected to a lifting plate 53, and the lifting plate 53 is pressed and matched with the drag frame 3. The one-way gear 52 drives the drag frame 3 to move upward through the lifting plate 53. The drag frame 3 is located on one side of the axis of the one-way gear 52. In this embodiment, the drag frame 3 is located on the right side of the axis of the one-way gear 52, so the one-way gear 52 can rotate counterclockwise ( Figure 1 From the perspective of front to rear), if in other embodiments, the towing frame 3 may be located on the left side of the axis of the one-way gear 52, then the one-way gear 52 may rotate clockwise ( Figure 1 from front to back perspective).

[0045] The control component is disposed in the frame 1 , and controls the one-way gear 52 to rotate, thereby releasing the cooperation between the lifting plate 53 and the dragging frame 3 , so as to cause the hammer 2 and the dragging frame 3 to fall downward.

[0046] refer to Figure 5-Figure 8 As shown, the control assembly includes a fixed frame 6, a sliding block 61, a first hydraulic telescopic rod 7, a second hydraulic telescopic rod 8 and a limit assembly. The fixed frame 6 is fixedly connected to the frame 1. The second hydraulic telescopic rod 8 is connected to the first hydraulic telescopic rod 7 through a hose. When the telescopic end of the first hydraulic telescopic rod 7 moves downward and contracts, it drives the telescopic end of the second hydraulic telescopic rod 8 to extend upward, thereby adjusting the timing for the hammer 2 and the drag frame 3 to fall downward.

[0047] The sliding block 61 is slidably connected to the fixed frame 6. The sliding block 61 is fixedly connected with a first rack 62. The first rack 62 is located at the upper part of the drag frame 3. When the first rack 62 contacts the one-way gear 52, the two mesh with each other. The one-way gear 52 rotates during the upward movement, causing the lifting plate 53 to rotate and release the extrusion fit with the drag frame 3.

[0048] The first hydraulic telescopic rod 7 is fixed in the frame 1, and the telescopic end of the first hydraulic telescopic rod 7 is slidably connected to the sliding block 61. A second elastic member 71 is installed between the telescopic end of the first hydraulic telescopic rod 7 and the sliding block 61. The second elastic member 71 is a spring. The second hydraulic telescopic rod 8 is fixed to the compacting hammer 2, and the telescopic end of the second hydraulic telescopic rod 8 is fixed to the towing frame 3 to measure the relative sliding distance between the compacting hammer 2 and the towing frame 3. The capacity and diameter of the second hydraulic telescopic rod 8 are respectively equal to the capacity and diameter of the first hydraulic telescopic rod 7 to ensure that the sliding distance of the sliding block 61 is equal to the thickness of the soil.

[0049] The limiting assembly is disposed in the frame 1 and is used to limit the sliding block 61 when the first rack 62 and the one-way gear 52 are meshed with each other, so as to prevent the sliding block 61 from sliding up and down under the reaction force.

[0050] refer to Figure 6 and Figure 8 As shown, the limiting assembly includes a limiting plate 9, a third elastic member 91 and an extrusion plate 92. The limiting plate 9 is slidably connected in the frame 1. A third elastic member 91 is installed between the limiting plate 9 and the frame 1. The third elastic member 91 is a spring. The limiting plate 9 squeezes the sliding block 61 under the action of the adjacent third elastic member 91 to limit the sliding block 61. The contact part of the limiting plate 9 with the sliding block 61 is made of high-friction rubber material. The limiting plate 9 wraps the sliding block 61 through the extrusion force, thereby increasing the force of the limiting plate 9 on the sliding block 61.

[0051] The extrusion plate 92 is rotatably connected to the frame 1. The right part of the extrusion plate 92 releases the cooperation between the limit plate 9 and the sliding block 61 by squeezing the limit plate 9. The upper part of the limit plate 9 is provided with a bending part. The bending part of the limit plate 9 is used to prevent the right part of the extrusion plate 92 from moving to the upper side of the limit plate 9, causing the extrusion plate 92 and the limit plate 9 to lose the cooperation, thereby ensuring the stability of the operation of the device. A support rod is provided on the rear side of the fixed block 51. The fixed block 51 squeezes the upper side of the extrusion plate 92 during the rotation of the following transmission device 5, thereby driving the extrusion plate 92 to rotate. The extrusion plate 92 is located at the upper part of the transmission device 5 (such as Figure 8 As shown), the fixing block 51 is extruded and matched with the extrusion plate 92 here, so that the force relationship between the two is more stable.

[0052] When the staff prepares to make soil test blocks with different moisture contents, the staff first breaks up the test soil into a loose state, and prepares soils with different moisture contents by evenly mixing different amounts of water into the loose soil. Then, the staff prepares to use the device to compact the soils with different moisture contents into soil test blocks. The staff first pours soil larger than 1 / 5 of the total capacity of the material bucket 102 into the material bucket 102, and then the staff starts the transmission device 5 through the control terminal 103, and the transmission device 5 drives the fixed block 51, the one-way gear 52 and the lifting plate 53 thereon to rotate cyclically (hereinafter, only the fixed block 51 and other components on the right are taken as an example to explain its working principle, and the rotation direction in this embodiment is counterclockwise rotation ( Figure 1 From the perspective of front to rear, when the lifting plate 53 rotates to the right side of the transmission device 5, the right side of the lifting plate 53 squeezes the drag frame 3 to move upward together, and the drag frame 3 drives the hammer 2 to move upward together until the one-way gear 52 contacts the first rack 62, and the one-way gear 52 rotates counterclockwise under the drive of the first rack 62 ( Figure 1 (From a front to rear perspective), the one-way gear 52 drives the lifting plate 53 to rotate together, and the right side of the lifting plate 53 first squeezes the drag frame 3 upward, and then when the right side of the lifting plate 53 rotates to a nearly vertical state, the lifting plate 53 is no longer in contact with the drag frame 3, and the drag frame 3 and the hammer 2 fall downward under the action of their own gravity, and the hammer 2 strikes the soil in the material bucket 102. After losing contact with the drag frame 3, the one-way gear 52 and the lifting plate 53 continue to rotate to a horizontal state, and then the one-way gear 52 disengages from the first rack 62, and the one-way gear 52 and the lifting plate 53 continue to rotate with the transmission device 5, waiting to lift the drag frame 3 upward again.

[0053] After the hammer 2 hits the soil in the material bucket 102, it stops above the soil, and the dragging frame 3 continues to fall downward under the action of its own gravity. The dragging frame 3 squeezes the telescopic end of the second hydraulic telescopic rod 8 to retract downward, and the hydraulic oil in the second hydraulic telescopic rod 8 flows into the first hydraulic telescopic rod 7 through the hose, causing the telescopic end of the first hydraulic telescopic rod 7 to extend upward until the dragging frame 3 contacts the receiving block 41. The dragging frame 3 squeezes the receiving block 41 through gravity and impact force and moves downward together, and the first elastic member 42 pulls The extension and storage force provide a buffer for the towing frame 3, reducing the force of mutual collision between the towing frame 3, the receiving block 41 and the receiving platform 4. When the receiving block 41 contacts the receiving platform 4, the towing frame 3 and the receiving block 41 stop moving downward, and the telescopic end of the first hydraulic telescopic rod 7 and the telescopic end of the second hydraulic telescopic rod 8 stop moving synchronously. At this time, the distance moved by the towing frame 3 relative to the compacting hammer 2 is equal to the thickness of the soil after being hit, the retracted length of the telescopic end of the second hydraulic telescopic rod 8 and the extended distance of the telescopic end of the first hydraulic telescopic rod 7.

[0054] When the telescopic end of the first hydraulic telescopic rod 7 extends upward, the sliding block 61 is pushed upward by the second elastic member 71. At this time, because the limiting plate 9 limits the sliding block 61 under the elastic force of the adjacent third elastic member 91, the sliding block 61 cannot move, and the second elastic member 71 is compressed and stored. When the fixed block 51 follows the transmission device 5 to rotate to the upper side of the transmission device 5, the fixed block 51 gradually drives the upper part of the extrusion plate 92 during the rotation process, so that the extrusion plate 92 rotates, and the extrusion plate 92 rotates to squeeze the limiting plate 9 to move rightward. The limiting plate 9 temporarily releases the limit on the sliding block 61, and the sliding block 61 moves upward under the push of the second elastic member 71. The sliding block 61 moves until the elastic force of the second elastic member 71 is completely released, and the sliding block 61 drives the first rack 62 to move upward together. At this time, the distance moved by the sliding block 61 is equal to the extended distance of the telescopic end of the first hydraulic telescopic rod 7. The upward movement of the first rack 62 changes the timing of the engagement between the one-way gear 52 and the first rack 62, and the upward movement distance of the first rack 62 is equal to the extended distance of the telescopic end of the first hydraulic telescopic rod 7 and the soil thickness. Therefore, by adjusting the height of the compacting hammer 2 and the towing frame 3 when they start to fall up and down, it is ensured that the compacting hammer 2 has the same impact force when compacting soils of different thicknesses, thereby improving the uniformity of the density of the produced test blocks.

[0055] When the fixed block 51 passes the upper side of the transmission device 5, the fixed block 51 is no longer in contact with the extrusion plate 92, and the limit plate 9 is reset to the left under the elastic force of the third elastic member 91, and continues to limit the sliding block 61, so as to prevent the sliding block 61 and the first rack 62 from moving up and down due to the reaction force when meshing with the one-way gear 52.

[0056] When the drag frame 3 contacts the lifting plate 53 again, the lifting plate 53 drives the drag frame 3 and its components to move upward again according to the same principle. The drag frame 3 first drives the telescopic end of the second hydraulic telescopic rod 8 to move upward until the drag frame 3 slides to the farthest distance from the hammer 2 (such as Figure 4 As shown), the compacting hammer 2 is then driven to move upward together. At this time, the telescopic end of the second hydraulic telescopic rod 8 is extended to the initial state, and the telescopic end of the first hydraulic telescopic rod 7 is restored to the initial state. The second elastic member 71 is stretched and stores force. After the compacting hammer 2 is lifted to a certain height, the above process is repeated to repeatedly compact the soil on the lower side. The rotating device 101 drives the material bucket 102 and the soil therein to rotate during the gap between the compacting hammer 2 to ensure the uniformity of the compaction.

[0057] After compacting a certain number of times, the staff turns off the transmission device 5 through the control terminal 103, and fills about 1 / 5 of the total capacity of the bucket 102 with soil again, and then repeats the above steps. When the bucket 102 is filled and compacted, the staff takes out the compacted test block and prepares to compact soil with other moisture contents.

[0058] In Example 1, the one-way gear 52 can rotate 180° (including integer multiples of 180°) by meshing with the first rack 62 once when following the rotation of the transmission device 5. In Example 2, the first rack 62 can only rotate the one-way gear 52 90° when meshing once, so as to prevent the one-way gear 52 from rotating too fast and colliding with the towing frame 3. The one-way gear 52 can only rotate back to the horizontal state after meshing with the second rack 63.

[0059] Embodiment 2: The control component also includes a second rack 63, which is fixed to the fixed frame 6. The second rack 63 drives the one-way gear 52 to rotate by meshing with the one-way gear 52. After the one-way gear 52 is in transmission cooperation with the first rack 62, the one-way gear 52 only rotates 90° each time. After the one-way gear 52 is in transmission cooperation with the first rack 62 and the second rack 63 in sequence, the one-way gear 52 always drives the lifting plate 53 to rotate to a horizontal state.

[0060] When the one-way gear 52 is engaged with the first rack 62, it only rotates to a vertical state to prevent the lifting plate 53 from colliding with the towing frame 3 that has just started to fall during the rotation of the components driven by the transmission device 5, thereby affecting the free fall movement of the towing frame 3 and the components thereon. When the fixed block 51, the one-way gear 52 and other components rotate to the left side of the transmission device 5, the one-way gear 52 is engaged with the second rack 63 and rotates, and the one-way gear 52 then drives the lifting plate 53 to rotate back to a horizontal state, thereby ensuring the stable operation of the device.

[0061] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the protection scope required by the present invention.

Claims

1. A compaction tester used for studying the moisture content of roadbed soil, characterized by: It comprises a frame (1), on which a rotating device (101) is mounted, and the rotating device (101) is used to receive and drive a sample to rotate; A compacting hammer (2) is slidably connected to the frame (1) and is located on the upper side of the rotating device (101); a dragging frame (3) is slidably connected to the upper side of the compacting hammer (2); and the dragging frame (3) is used to measure the thickness of the sample; A receiving platform (4) is fixedly connected to the frame (1), and the receiving platform (4) is used to control the dragging frame (3) to stop moving at a fixed position; A transmission mechanism, the transmission mechanism being arranged in the frame (1) and being used for driving the compacting hammer (2) and the dragging frame (3) to move upwards a specific distance; The transmission mechanism comprises: A transmission device (5) is installed in the frame (1), and the transmission device (5) is used to drive the components thereon to reciprocate; A fixed block (51) is fixedly connected to the transmission device (5); a one-way gear (52) is mounted on the fixed block (51); a lifting plate (53) is fixedly connected to the one-way gear (52); the lifting plate (53) is pressed and matched with the dragging frame (3) to drive the dragging frame (3) to move upward; A control component, disposed in the frame (1), used to control the rotation of the one-way gear (52), thereby releasing the engagement between the lifting plate (53) and the dragging frame (3); The control component comprises: A fixed frame (6) is fixedly connected to the frame (1); the fixed frame (6) is slidably connected to a sliding block (61); the sliding block (61) is fixedly connected to a first rack (62); the first rack (62) is located at the upper part of the dragging frame (3); the first rack (62) is in transmission cooperation with the one-way gear (52); A first hydraulic telescopic rod (7) is fixedly connected to the frame (1), the telescopic end of the first hydraulic telescopic rod (7) is slidably connected to the sliding block (61), and a second elastic member (71) is installed between the telescopic end of the first hydraulic telescopic rod (7) and the sliding block (61); a second hydraulic telescopic rod (8) fixedly connected to the hammer (2), a telescopic end of the second hydraulic telescopic rod (8) fixedly connected to the towing frame (3), and the second hydraulic telescopic rod (8) being connected to the first hydraulic telescopic rod (7) via a hose; A limiting assembly, arranged in the frame (1) and used for limiting the position of the sliding block (61); The thickness of the sample is detected by the relative movement of the compacting hammer (2) and the dragging frame (3), and then the transmission mechanism is used to ensure that the compacting hammer (2) always moves upward to a specific distance from the upper surface of the sample, thereby ensuring that the compacting hammer (2) always has the same impact force on samples of different thicknesses.

2. A compaction tester for studying the moisture content of roadbed soil according to claim 1, characterized in that: The receiving platform (4) is slidably connected to a receiving block (41); the dragging frame (3) and the receiving platform (4) are both in contact with and cooperate with the receiving block (41), thereby limiting the position of the dragging frame (3); a first elastic member (42) is installed between the receiving platform (4) and the receiving block (41); the first elastic member (42) is used to buffer the dragging frame (3).

3. The compaction tester for studying the moisture content of roadbed soil according to claim 1, characterized in that: There is damping between the fixed block (51) and the one-way gear (52), which is used to prevent the one-way gear (52) from rotating freely.

4. The compaction tester for studying the moisture content of roadbed soil according to claim 1, characterized in that: The capacity and diameter of the second hydraulic telescopic rod (8) are respectively equal to the capacity and diameter of the first hydraulic telescopic rod (7).

5. The compaction tester for studying the moisture content of roadbed soil according to claim 1, characterized in that: The limiting component comprises: A limit plate (9) is slidably connected to the frame (1), the limit plate (9) and the sliding block (61) are in position-limiting cooperation, and a third elastic member (91) is installed between the limit plate (9) and the frame (1); The extrusion plate (92) is rotatably connected to the frame (1); the extrusion plate (92) is extruded and matched with the limit plate (9); and the extrusion plate (92) is extruded and matched with the fixing block (51).

6. A compaction tester for studying the moisture content of roadbed soil according to claim 5, characterized in that: A bending portion is provided at the contact point between the limiting plate (9) and the extrusion plate (92), and the bending portion is used to prevent the contact point between the extrusion plate (92) and the limiting plate (9) from moving to the upper side of the limiting plate (9).

7. The compaction tester for studying the moisture content of roadbed soil according to claim 5, characterized in that: The control assembly further comprises: a second rack (63) fixedly connected to the fixing frame (6), the second rack (63) being in transmission cooperation with the one-way gear (52).

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