A compaction device

Abstract

The present invention relates to the technical field of compaction test, and in particular, to a compaction instrument. A compaction instrument comprises a frame, a sinking mechanism, a hammer lifting mechanism and a tracking mechanism. The frame comprises a frame body and a first platform connected to the frame body and off the ground; the sinking mechanism comprises a first power unit, a travel rod and a top block; the first power unit is connected to the first platform, the travel rod is movably connected to the first platform in a vertical direction, the top block is connected to an end of the travel rod facing the ground, and the first power unit is used to drive the travel rod to move relative to the first platform in a vertical direction; the hammer lifting mechanism comprises a second power unit, a lifting rod, a compaction hammer and a claw; the claw is used to grab the compaction hammer, and the claw is used to grab or release the compaction hammer to make it rise or fall; the tracking mechanism is used to measure the displacement of the lifting rod relative to the travel rod. The compaction instrument can make the drop distance of the compaction hammer consistent during the falling process, thereby avoiding errors in experimental data.

Description

Technical Field

[0001] The invention relates to the technical field of compaction testing, in particular to a compaction instrument. Background Art

[0002] When using a compactor to conduct compaction tests on coarse-grained soil, the sample has a certain amount of subsidence after each compaction. However, the existing technology often ignores the impact of the sample subsidence on the entire experiment, resulting in inconsistencies in the multiple drop distances of the compaction hammer, which in turn causes errors in the experimental data. Summary of the invention

[0003] The object of the present invention is to provide a compaction instrument, which can make the falling distance of the compaction hammer consistent during the falling process, thereby avoiding errors in experimental data.

[0004] The embodiment of the present invention is achieved as follows:

[0005] In a first aspect, an embodiment of the present invention provides a compaction instrument, comprising:

[0006] A frame, the frame comprising a frame body and a first platform connected to the frame body and off the ground;

[0007] The sinking mechanism includes a first power unit, a travel rod and a top block; the first power unit is connected to the first platform, the travel rod is movably connected to the first platform along the vertical direction, the top block is connected to one end of the travel rod facing the ground, and the first power unit is used to drive the travel rod to move in the vertical direction relative to the first platform;

[0008] The hammer lifting mechanism includes a second power unit, a lifting rod, a hammer and a claw; the second power unit is connected to the first platform, the lifting rod is movably connected to the first platform along the vertical direction, the second power unit is used to drive the lifting rod to move relative to the first platform along the vertical direction, and the claw is connected to an end of the lifting rod facing the ground; the claw is used to grab the hammer, and the claw is used to abut against the top block to release the hammer;

[0009] And a tracking mechanism, the tracking mechanism includes a tracking rod and a photoelectric ranging sensor, one end of the tracking rod is connected to the travel rod, and the tracking rod is arranged in parallel with the lifting rod; the photoelectric ranging sensor is connected to the lifting rod, and the photoelectric ranging sensor is used to measure the displacement of the lifting rod relative to the travel rod.

[0010] In an optional embodiment, the first power unit includes a first motor and a first transmission gear;

[0011] The outer peripheral surface of the travel rod is provided with a first bar-shaped tooth, and the first transmission gear is connected to the main shaft of the first motor and meshes with the first bar-shaped tooth.

[0012] In an optional embodiment, the second power unit includes a second motor and a second transmission gear;

[0013] The outer peripheral surface of the lifting rod is provided with a second strip-shaped tooth, and the second transmission gear is connected to the main shaft of the second motor and meshes with the second strip-shaped tooth.

[0014] In an optional embodiment, the lifting rod and the travel rod are both hollow structures, and the travel rod is sleeved on the lifting rod;

[0015] The compacting hammer comprises a hammer head and a guide rod connected to the hammer head, and a clamping groove for clamping with a clamping claw is arranged on the outer peripheral surface of the hammer head;

[0016] The guide rod is arranged in the vertical direction, one end of the guide rod extends into the lifting rod, and a gap is provided between the part of the guide rod located inside the lifting rod and the inner circumference of the lifting rod; the length of the guide rod is greater than the maximum stroke of the lifting rod.

[0017] In an optional embodiment, the travel rod is provided with a bar-shaped hole, and the second transmission gear is meshed with the second bar-shaped teeth in which the bar-shaped hole is opened.

[0018] In an optional embodiment, along the vertical direction, the length of the tracking rod is greater than or equal to the maximum stroke of the lifting rod.

[0019] In an optional embodiment, the rack further includes a second platform connected to the rack body, the second platform is located below the first platform and spaced apart from the first platform, and the second platform is used to place the sample tube.

[0020] In an optional embodiment, the compaction instrument includes a third power unit, the second platform is rotatably connected to the frame, and the third power unit is used to drive the second platform to rotate relative to the frame.

[0021] In an optional embodiment, the third power unit includes a third motor and a dividing transmission disk, and the dividing transmission disk is drivingly connected to the second platform and the third motor.

[0022] In an optional embodiment, the compactor further comprises a lifting arm, and the lifting arm is rotatably connected to the first platform.

[0023] The beneficial effects of the embodiments of the present invention include:

[0024] The compaction instrument includes a frame, a sinking mechanism, a hammer lifting mechanism and a tracking mechanism. Among them, the sinking mechanism includes a first power unit, a travel rod and a top block. The first power unit is used to drive the travel rod to move in a vertical direction relative to the first platform; the hammer lifting mechanism includes a second power unit, a lifting rod, a compaction hammer and a claw. The second power unit is used to drive the lifting rod to move in a vertical direction relative to the first platform, and the claw is connected to the end of the lifting rod facing the ground; the claw is used to grab the compaction hammer, and the claw is used to abut against the top block to release the compaction hammer. Therefore, during the operation of the compaction instrument, the claw is driven by the hammer lifting mechanism to move in a vertical direction, so that the compaction hammer grabbed by the claw can be driven to rise, and after the claw rises to a certain height and abuts against the top block, the claw will release the grabbed compaction hammer, and the fall of the compaction hammer is convenient for impacting the sample below, thereby performing a compaction test.

[0025] In the above process, after the sample is impacted by the compacting hammer, it will sink to a certain extent, which will change the distance between the compacting hammer and the impact surface of the sample, that is, the drop distance of the compacting hammer will change, which will cause errors in the experiment; based on this, in the process of the above compaction test, the tracking mechanism can detect the displacement of the tracking rod in the vertical direction through the photoelectric distance sensor, and the photoelectric distance sensor and the tracking rod are respectively connected to the lifting rod and the travel rod, so that the displacement of the lifting rod when the compaction instrument is lowered and grabs the compacting hammer after completing a compaction can be detected in this way, and then in this way, by measuring the displacement of the lifting rod when grabbing the compacting hammer, the movement of the first power unit can be controlled to make the travel rod move relative to the first platform, and then the position of the top block relative to the first platform can be adjusted, so as to adjust the release height of the compacting hammer. In this way, the drop distance of the compacting hammer is consistent during the falling process, thereby avoiding errors in experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural schematic diagram of the compaction instrument from the first viewing angle in an embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the second viewing angle of the compaction instrument in an embodiment of the present invention;

[0029] Figure 3It is a structural schematic diagram of a sinking mechanism and a hammer lifting mechanism from a first viewing angle in an embodiment of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the sinking mechanism and the hammer lifting mechanism from a second viewing angle in an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the structure of the hammer in the embodiment of the present invention;

[0032] Figure 6 It is a structural schematic diagram of a travel rod in an embodiment of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the travel rod, the lifting rod and the guide rod in the embodiment of the present invention.

[0034] Icons: 100-compactor; 110-frame; 111-frame; 112-first platform; 120-sinking mechanism; 121-first power unit; 122-travel rod; 123-top block; 130-hammer lifting mechanism; 131-second power unit; 132-lifting rod; 133-compacting hammer; 134-claw; 140-tracking mechanism; 141-tracking rod; 124-first motor; 125-first transmission gear; 126-first bar gear; 135-second motor; 136-second transmission gear; 137-second bar gear; 138-hammer head; 139-guide rod; 171-slot; 127-bar hole; 113-second platform; 114-sample tube; 150-third power unit; 151-third motor; 152-dividing transmission disk; 160-lifting arm. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Please refer to Figure 1-Figure 7 , Figure 1 and Figure 2 The structure of the compaction instrument in the embodiment of the present invention is shown. Figure 3-Figure 7 The structure of the sinking mechanism and the hammer lifting mechanism in the embodiment of the present invention is shown. The embodiment provides a compaction instrument 100 including a frame 110 , a sinking mechanism 120 , a hammer lifting mechanism 130 and a tracking mechanism 140 .

[0042] The frame 110 includes a frame body 111 and a first platform 112 connected to the frame body 111 and off the ground;

[0043] The sinking mechanism 120 includes a first power unit 121, a travel rod 122 and a top block 123; the first power unit 121 is connected to the first platform 112, the travel rod 122 is movably connected to the first platform 112 along the vertical direction, and the top block 123 is connected to an end of the travel rod 122 facing the ground, and the first power unit 121 is used to drive the travel rod 122 to move relative to the first platform 112 along the vertical direction;

[0044] The hammer lifting mechanism 130 includes a second power unit 131, a lifting rod 132, a hammer 133 and a claw 134; the second power unit 131 is connected to the first platform 112, the lifting rod 132 is movably connected to the first platform 112 along the vertical direction, the second power unit 131 is used to drive the lifting rod 132 to move relative to the first platform 112 along the vertical direction, and the claw 134 is connected to the end of the lifting rod 132 facing the ground; the claw 134 is used to grab the hammer 133, and the claw 134 is used to abut against the top block 123 to release the hammer 133;

[0045] The tracking mechanism 140 includes a tracking rod 141 and a photoelectric ranging sensor. One end of the tracking rod 141 is connected to the travel rod 122, and the tracking rod 141 is arranged parallel to the lifting rod 132. The photoelectric ranging sensor is connected to the lifting rod 132, and the photoelectric ranging sensor is used to measure the displacement of the lifting rod 132 relative to the travel rod 122.

[0046] It should be noted that, firstly, when setting the first platform 112, the height of the first platform 112 from the ground needs to meet the test requirements of the sample, that is, the maximum height of the first platform 112 needs to be greater than the maximum release height of the compaction hammer 133 during the compaction test;

[0047] Secondly, when setting the sinking mechanism 120, the hammer lifting mechanism 130 and the tracking mechanism 140, the first power unit 121 and the second power unit 131 are used to respectively drive the travel rod 122 and the lifting rod 132 to move in the vertical direction. Therefore, when the travel rod 122 and the lifting rod 132 are set, the axes of the travel rod 122 and the lifting rod 132 are parallel or coincident; and the function of the top block 123 is to abut against the claw 134 to trigger the claw 134 to release the grasped hammer 133. Therefore, the height of the top block 123 determines the height of the claw 134 releasing the hammer 133. Therefore, when the claw 134 and the top block 123 are set, the top block 123 needs to be located above the claw 134, and the height of the claw 134 releasing the hammer 133 can be adjusted by driving the travel rod 122 to move by the first power unit 121.

[0048] In summary, please refer to Figure 1-Figure 7 The working principle of the compaction instrument 100 is:

[0049] The compaction instrument 100 includes a frame 110, a sinking mechanism 120, a hammer lifting mechanism 130 and a tracking mechanism 140. The sinking mechanism 120 includes a first power unit 121, a travel rod 122 and a top block 123. The first power unit 121 is used to drive the travel rod 122 to move relative to the first platform 112 in a vertical direction; the hammer lifting mechanism 130 includes a second power unit 131, a lifting rod 132, a compaction hammer 133 and a claw 134. The second power unit 131 is used to drive the lifting rod 132 to move relative to the first platform 112 in a vertical direction. The claw 134 is connected to one end of the lifting rod 132 facing the ground; the claw 134 is used to grab the compaction hammer 133, and the claw 134 is used to abut against the top block 123 to release the compaction hammer 133. Therefore, during the operation of the compaction instrument 100, the claw 134 is driven to move in the vertical direction through the hammer lifting mechanism 130, so that the compaction hammer 133 grasped by the claw 134 can be driven to rise. After the claw 134 rises to a certain height and abuts against the top block 123, the claw 134 will release the grasped compaction hammer 133, and the falling of the compaction hammer 133 facilitates the impact on the sample below, thereby performing a compaction test.

[0050] In the above process, after the sample is impacted by the compacting hammer 133, it will sink to a certain extent, which will change the distance between the compacting hammer 133 and the impact surface of the sample, that is, the drop distance of the compacting hammer 133 will change, which will cause errors in the experiment. Based on this, in the process of the above compaction test, the tracking mechanism 140 can detect the displacement of the tracking rod 141 in the vertical direction through the photoelectric distance sensor, and the photoelectric distance sensor and the tracking rod 141 are respectively connected to the lifting rod 132 and the travel rod 122, so that the displacement of the lifting rod 132 when the compaction instrument 100 descends and grabs the compacting hammer 133 after completing a compaction can be detected in this way, and then in this way, by measuring the displacement of the lifting rod 132 when grabbing the compacting hammer 133, by controlling the movement of the first power unit 121, the travel rod 122 moves relative to the first platform 112, and then the position of the top block 123 relative to the first platform 112 is adjusted, thereby adjusting the release height of the compacting hammer 133. As a result, the falling distance of the hammer 133 during the falling process is made consistent, thereby avoiding errors in the experimental data.

[0051] Based on the above-mentioned compaction instrument 100, in an embodiment of the present invention, the compaction instrument 100 may further include a controller, and the controller is electrically connected to the above-mentioned first power unit 121, the second power unit 131 and the photoelectric distance sensor;

[0052] First, the controller is used to adjust the positions of the travel rod 122 and the lifting rod 132 by controlling the movement of the first power unit 121 and the second power unit 131, so as to control the lifting rod 132 to descend to grab the compacting hammer 133, or control the lifting rod 132 to ascend to contact with the top block 123 to release the compacting hammer 133, and control the ascending and descending of the travel rod 122, so as to adjust the release height of the compacting hammer 133;

[0053] Secondly, the controller is used to collect the position signal output by the photoelectric ranging sensor, so as to calculate the moving distance of the tracking rod 141; it should be noted that when the lifting rod 132 descends and grabs the hammer 133, the synchronous movement distance of the tracking rod 141 and the lifting rod 132 is the movement distance of the lifting rod 132.

[0054] Therefore, through such a measurement method, the controller can calculate the gripping height of the lifting rod 132 of the compaction instrument 100 after completing a compaction, and compare the gripping height with the release height of the compaction hammer 133 of this compaction, so as to obtain the sinking distance of the sample. After calculating the sinking distance of the sample, the controller can adjust the position of the top block 123 by controlling the first power unit 121 to make the release height of the adjusted compaction hammer 133 consistent with the gripping stroke of the previous compaction, so that the falling distance of the compaction hammer 133 is consistent during multiple falls, thereby avoiding errors in experimental data.

[0055] For further information, please refer to Figure 2-Figure 7 In this embodiment, in the process of adjusting the position of the top block 123, the first power unit 121 is used to drive the travel rod 122 to move. In this process, in order to improve the accuracy of adjusting the position of the top block 123, the first power unit 121 may include a first motor 124 and a first transmission gear 125. The outer peripheral surface of the travel rod 122 is provided with a first bar-shaped tooth 126. The first transmission gear 125 is connected to the main shaft of the first motor 124 and meshes with the first bar-shaped tooth 126. Therefore, in the process of adjusting the position of the top block 123 by the movement of the travel rod 122, the gear and rack are matched to improve the accuracy of the position adjustment of the top block 123 in this way, so as to further reduce the error of the compaction test.

[0056] Similar to the above-mentioned setting, when driving the lifting rod 132 to move, the second power unit 131 includes a second motor 135 and a second transmission gear 136; the outer peripheral surface of the lifting rod 132 is provided with a second bar tooth 137, and the second transmission gear 136 is connected to the main shaft of the second motor 135 and meshes with the second bar tooth 137.

[0057] For further information, please refer to Figure 1-Figure 7In this embodiment, when the lifting rod 132 and the travel rod 122 are provided, in order to facilitate the tracking mechanism 140 to measure the relative movement between the lifting rod 132 and the travel rod 122 and improve the position adjustment accuracy of the claw 134 and the top block 123, the lifting rod 132 and the travel rod 122 are both hollow structures, and the travel rod 122 is sleeved on the lifting rod 132. The compacting hammer 133 includes a hammer head 138 and a guide rod 139 connected to the hammer head 138. The outer peripheral surface of the hammer head 138 is provided with a card slot 171 for clamping with the claw 134; the guide rod 139 is provided in the vertical direction, one end of the guide rod 139 extends into the lifting rod 132, and the part of the guide rod 139 located in the lifting rod 132 has a gap with the inner peripheral surface of the lifting rod 132.

[0058] Therefore, by mutually nesting the lifting rod 132 and the travel rod 122, a certain guiding effect can be provided between the lifting rod 132 and the travel rod 122, so that the relative movement direction accuracy between the two can be improved in this way.

[0059] Moreover, since one end of the guide rod 139 extends into the lifting rod 132 and is loosely matched with the lifting rod 132, it is possible to avoid motion interference between the striking hammer 133 and the lifting rod 132 during the falling process, resulting in the falling motion of the striking hammer 133 being a non-free fall motion. At the same time, when the lifting rod 132 descends to allow the claw 134 to grab the striking hammer 133, the lifting rod 132 can be guided to move downward through the guide rod 139 to play a guiding role, thereby improving the efficiency of grabbing the striking hammer 133.

[0060] It should be noted that when setting the guide rod 139, since the maximum stroke of the lifting rod 132 is the maximum stroke of the lifting rod 132 to grab the compacting hammer 133, that is, the maximum stroke of the lifting rod 132 is equal to the maximum drop distance of the compacting hammer 133, when setting the guide rod 139, the length of the guide rod 139 can be made greater than the maximum stroke of the lifting rod 132 to prevent the guide rod 139 from moving outside the lifting rod 132 during the compaction test. Similarly, when setting the tracking rod 141, the length of the tracking rod 141 along the vertical direction is greater than or equal to the maximum stroke of the lifting rod 132.

[0061] From the above content, it can be seen that the travel rod 122 is sleeved on the lifting rod 132, and both the travel rod 122 and the lifting rod 132 adopt a gear meshing transmission method. Therefore, in order to avoid the travel rod 122 sleeved outside the lifting rod 132 interfering with the transmission of the lifting rod 132, the travel rod 122 is provided with a bar hole 127, and the second transmission gear 136 is meshed with the second bar tooth 137 opened in the bar hole 127.

[0062] For further information, please refer to Figure 1 and Figure 2 In this embodiment, in order to facilitate the placement of the sample, the rack 110 also includes a second platform 113 connected to the rack body 111 . The second platform 113 is located below the first platform 112 and is spaced apart from the first platform 112 . The second platform 113 is used to place the sample tube 114 .

[0063] It should be noted that when conducting the compaction test, it is necessary to adjust the position of the sample on the second platform 113 relative to the compaction hammer 133 above. In the present embodiment, the method of rotating the sample is adopted. Therefore, the compaction instrument 100 includes a third power unit 150. The second platform 113 is rotatably connected to the frame 111. The third power unit 150 is used to drive the second platform 113 to rotate relative to the frame 111.

[0064] Specifically, in this embodiment, the third power unit 150 includes a third motor 151 and a dividing transmission disk 152, and the dividing transmission disk 152 is connected to the second platform 113 and the third motor 151. In this way, the rotation angle of the second platform 113 can be controlled by driving the third motor 151 and the dividing rotating disk.

[0065] Furthermore, in order to facilitate the placement of the sample tube 114 and reduce the labor intensity of workers, the compaction instrument 100 also includes a lifting arm 160 , which is rotatably connected to the first platform 112 and is used to lift the sample tube 114 .

[0066] The above are only specific embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compaction instrument, characterized in that: include: A frame, the frame comprising a frame body and a first platform connected to the frame body and off the ground; A sinking mechanism, the sinking mechanism comprising a first power unit, a travel rod and a top block; the first power unit is connected to the first platform, the travel rod is movably connected to the first platform along a vertical direction, the top block is connected to an end of the travel rod facing the ground, and the first power unit is used to drive the travel rod to move in a vertical direction relative to the first platform; A hammer lifting mechanism, the hammer lifting mechanism comprising a second power unit, a lifting rod, a hammer and a claw; the second power unit is connected to the first platform, the lifting rod is movably connected to the first platform along the vertical direction, the second power unit is used to drive the lifting rod to move relative to the first platform along the vertical direction, the claw is connected to one end of the lifting rod facing the ground; the claw is used to grab the hammer, and the claw is used to abut against the top block to release the hammer; and a tracking mechanism, the tracking mechanism comprising a tracking rod and a photoelectric distance sensor, one end of the tracking rod is connected to the travel rod, and the tracking rod is arranged in parallel with the lifting rod; the photoelectric distance sensor is connected to the lifting rod, and the photoelectric distance sensor is used to measure the displacement of the lifting rod relative to the travel rod; The first power unit includes a first motor and a first transmission gear; The outer peripheral surface of the travel rod is provided with a first bar-shaped tooth, and the first transmission gear is connected to the main shaft of the first motor and meshes with the first bar-shaped tooth; In the vertical direction, the length of the tracking rod is greater than or equal to the maximum stroke of the lifting rod.

2. The compaction device according to claim 1, characterized in that: The second power unit includes a second motor and a second transmission gear; The outer peripheral surface of the lifting rod is provided with a second bar-shaped tooth, and the second transmission gear is connected to the main shaft of the second motor and meshes with the second bar-shaped tooth.

3. The compaction instrument according to claim 2, characterized in that: The lifting rod and the travel rod are both hollow structures, and the travel rod is sleeved on the lifting rod; The compacting hammer comprises a hammer head and a guide rod connected to the hammer head, and the outer peripheral surface of the hammer head is provided with a clamping groove for clamping with the clamping claw; The guide rod is arranged in the vertical direction, one end of the guide rod extends into the lifting rod, and a portion of the guide rod located inside the lifting rod has a gap with the inner circumference of the lifting rod; the length of the guide rod is greater than the maximum stroke of the lifting rod.

4. The compaction instrument according to claim 3, characterized in that: The travel rod is provided with a bar-shaped hole, and the second transmission gear is meshed with the second bar-shaped teeth of the open bar-shaped hole.

5. The compaction instrument according to claim 1, characterized in that: The rack further comprises a second platform connected to the rack body, the second platform is located below the first platform and spaced apart from the first platform, and the second platform is used for placing the sample tube.

6. The compaction instrument according to claim 5, characterized in that: The compaction instrument comprises a third power unit, the second platform is rotatably connected to the frame, and the third power unit is used to drive the second platform to rotate relative to the frame.

7. The compaction instrument according to claim 6, characterized in that: The third power unit includes a third motor and a dividing transmission disk, and the dividing transmission disk is drivingly connected to the second platform and the third motor.

8. The compaction instrument according to claim 1, characterized in that: The compaction instrument further comprises a lifting arm, and the lifting arm is rotatably connected to the first platform.

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