Surface compaction tester capable of automatically centering

Abstract

The utility model discloses a surface compaction tester capable of automatically centering, and relates to the technical field of vibration compaction instruments. A base is included; the centering mechanism is arranged on the base and comprises a plurality of centering clamping jaws and a centering driving assembly for driving the centering clamping jaws to be close to each other; the two vertical shafts are oppositely arranged on the two sides of the centering mechanism, and one end of each vertical shaft is arranged on the base; the lifting driving assembly and the lifting plate are arranged between the base and the fixing plate in a sliding mode in the vertical direction; the jolt ramming mechanism comprises a vibration unit and a vibration mechanism, the vibration unit is connected with the vibration mechanism, and the vibration mechanism is arranged on the lifting plate and is suitable for driving the vibration unit to vibrate; according to the technical scheme provided by the invention, the adjusting time of a worker on the bearing barrel is saved, manpower is liberated, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration compaction apparatus, and in particular to a surface compaction tester capable of automatic centering. BACKGROUND

[0002] The surface vibration compaction tester is used for determining the maximum dry density of free-draining coarse-grained soils and large-grained soils (including rockfill materials); the vibration rammer plate makes vertical vibration compaction on the sample surface, and the particle diamond is cut and broken, and the particle position is rearranged and moved to the stable position corresponding to the standard condition of the soil test specification, so that the soil body is compacted.

[0003] During operation, the staff places the load bucket loaded with materials under the compaction mechanism, the compaction mechanism is pressed into the load bucket and abuts against the surface of the materials, and then the compaction plate is driven by the vibration mechanism to act on the materials.

[0004] In order to avoid that the compaction plate can better compact the materials, the gap between the outer diameter of the compaction plate and the inner diameter of the load bucket is small, so it is necessary to ensure that the load bucket and the compaction plate are coaxial as much as possible, otherwise the problem of blocking and not being able to extend will occur. The traditional compaction tester generally needs to be adjusted by the staff for many times INVENTION CONTENTS

[0005] The present application aims to provide a surface compaction tester capable of automatic centering to solve at least one of the above technical problems.

[0006] In order to solve the above technical problems, the present application provides a surface compaction tester capable of automatic centering, which comprises a base;

[0007] A centering mechanism is arranged on the base and comprises a plurality of centering clamping jaws and a centering driving assembly for driving the plurality of centering clamping jaws to close;

[0008] A vertical shaft is arranged on two sides of the centering mechanism and has one end arranged on the base and the other end arranged with a fixed plate;

[0009] A lifting driving assembly and a lifting plate are arranged between the base and the fixed plate in the vertical direction, and the lifting driving assembly is used to drive the lifting plate to lift and lower;

[0010] A compaction mechanism comprises a vibration unit and a vibration mechanism, the vibration unit is connected with the vibration mechanism, the vibration mechanism is arranged on the lifting plate and is adapted to drive the vibration unit to vibrate;

[0011] In the implementation process, the staff places the material-loaded bearing bucket on the base below the vibration unit, and then starts the centering mechanism. The centering driving assembly drives multiple centering clamps to move towards the bearing bucket at the same time, the clamps after moving towards the bearing bucket abut against the outer wall of the bearing bucket and realize automatic centering of the bearing bucket. Understandably, the vibration unit is centrally arranged during assembly. In this way, the coaxiality of the vibration unit and the bearing bucket can be ensured, so that the vibration unit can smoothly enter the bearing bucket, and the subsequent vibration generated by the vibration mechanism can complete the compaction test. The present scheme can realize automatic centering of the bearing bucket, thereby ensuring the coaxiality of the bearing bucket and the vibration unit, saving the staff's adjustment time of the bearing bucket, freeing manpower, and improving work efficiency.

[0012] Preferably, the centering driving assembly comprises a first rotary driving member, a fixed seat, a rotating shaft, a rotary block, a first sliding rail, a first sliding block and a first connecting rod;

[0013] The first rotary driving member is arranged at the bottom of the fixed seat, the rotating shaft is arranged through the fixed seat, one end of the rotating shaft is connected to the driving end of the first rotary driving member, and the other end is connected to the rotary block;

[0014] The first sliding rail is arranged in several numbers and extends along the radial direction of the rotary block. The first sliding rails are distributed at equal angles. Each first sliding rail is slidably provided with a first sliding block, and the centering clamp is arranged on the first sliding block. First through holes are formed in the base for the centering clamps to pass through. One end of the first connecting rod is rotatably arranged on the rotary block, and the other end is rotatably arranged on the first sliding block.

[0015] In the implementation process, the first rotary driving member drives the rotary block to rotate through the rotating shaft. When the rotary block rotates, the first sliding block can be driven to move by the first connecting rod. The first sliding block is limited by the first sliding rail, so it can only move linearly along the extension direction of the first sliding rail. The centering clamp is arranged on the first sliding block, so when the first rotary driving member works, it can drive multiple first clamps to move towards each other or away from each other, and finally complete the centering and correction. The present scheme only needs one driving mechanism to realize the synchronous centering action of multiple centering clamps, effectively saving the number of driving mechanisms, and the action consistency of the centering clamps is high.

[0016] Preferably, it further comprises an L-shaped fixed block, the fixed block comprises a long side and a short side, and a first waist-shaped hole is formed in the long side along the length direction of the long side;

[0017] A plurality of groups of holes are circumferentially arranged around the rotary block on the base, each group of holes comprises a plurality of mounting holes spaced apart along the radial direction of the rotary block;

[0018] In the implementation process, after the centering mechanism completes the centering and deviation correction of the bearing barrel, the worker can abut the short edge of the fixing block against the side wall of the bearing barrel and abut the long edge against the base, and then lock through the first waist-shaped hole and the mounting hole in sequence by the locking bolt, so that the limiting stability of the bearing barrel is further enhanced, and the stability of the position of the bearing barrel in the vibration process is ensured; the fixing block in the scheme can also be assembled in various ways to improve the limiting stability of the bearing barrel. The long edge of the fixing block is abutted against the edge of the bottom of the bearing barrel, and the end of the short edge is abutted against the base, and then the locking screw is locked through the first waist-shaped hole and the mounting hole, so that the bearing barrel is pressed in the longitudinal direction, and the limiting and fixing in multiple dimensions are realized by cooperating with the limiting of the side, and the limiting stability is further improved.

[0019] Preferably, the hole groups are arranged between the adjacent two centering clamps;

[0020] Preferably, the hole groups are arranged at equal angles with the centering clamps;

[0021] In the implementation process, the hole groups are arranged at equal angles with the centering clamps, so that the common limiting from multiple angles is realized, and the stress of the bearing barrel in each angle limiting is more uniform.

[0022] Preferably, a limiting groove is arranged at the end of each hole group away from the rotating block, and the limiting groove is suitable for limiting the short edge of the fixing block;

[0023] In the implementation process, when the fixing block is installed by abutting the end of the short edge against the base, the end of the short edge can be inserted into the limiting groove, and the limiting groove can limit the fixing block to improve the stability of the assembly.

[0024] Preferably, the vibration unit is detachably arranged on the vibration mechanism;

[0025] In the implementation process, the vibration unit is detachably arranged on the vibration mechanism. When the barrel diameter of the tested bearing barrel changes, the outer diameter of the vibration unit also needs to be adjusted correspondingly, and at this time, the vibration unit with the corresponding length needs to be replaced.

[0026] Preferably, the lifting driving assembly comprises a lead screw, a threaded sleeve, a mounting seat and a second rotary driving piece;

[0027] The second rotary driving piece is used for driving the threaded sleeve to rotate, the lead screw is threadedly matched with the threaded sleeve and one end of the lead screw is arranged on the mounting seat, the mounting seat is fixedly connected with the lifting plate, and the threaded sleeve is rotatably arranged on the fixed plate;

[0028] In the implementation process, the second rotating driving member is used to drive the threaded sleeve to rotate, the threaded sleeve is rotatably arranged on the fixed plate and is threadedly matched with the lead screw, the threaded sleeve can drive the lead screw to reciprocatingly move along the axial direction of the lead screw when the threaded sleeve rotates, the lead screw is connected with the mounting seat on the lifting plate, so as to drive the lifting plate to lift.

[0029] Preferably, a pressure sensor is arranged on the lifting plate, and an abutting block is arranged on the side of the fixed plate close to the lifting plate and in the moving path of the pressure sensor.

[0030] In the implementation process, when the lifting plate rises, the pressure sensor approaches the abutting block, and when the lifting plate rises to a too high height, the pressure sensor abuts against the abutting block and sends a corresponding signal, so as to avoid the problem of overtravel of upward movement.

[0031] Preferably, the lifting driving assembly comprises a lifting cylinder and a connecting shaft arranged at the driving end of the lifting cylinder, and the other end of the connecting shaft is connected with the lifting plate.

[0032] In the implementation process, the lifting cylinder drives the lifting plate to realize the lifting action through the connecting shaft.

[0033] Compared with the prior art, the beneficial effects of the present application are that the automatic centering of the bearing barrel can be realized by arranging the centering mechanism, so as to ensure the coaxiality of the bearing barrel and the vibration unit, save the adjustment time of the bearing barrel by the staff, liberate manpower, and improve the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 is a schematic diagram of the overall structure of one embodiment of the present application;

[0036] Figure 2 is Figure 1 is a schematic diagram of the structure of part A in

[0037] Figure 3 is a schematic diagram of the overall structure of one embodiment of the present application;

[0038] Figure 4 is a schematic diagram of part of the centering mechanism of one embodiment of the present application;

[0039] Figure 5is a structural schematic view of a fixed block of one embodiment of the present application;

[0040] Figure 6 is an assembled state schematic view of a fixed block of one embodiment of the present application;

[0041] Wherein: 11, base; 111, first through hole; 12, fixed plate; 13, vertical shaft; 14, lifting plate; 21, fixed seat; 22, centering clamping jaw; 23, first sliding block; 24, first sliding rail; 25, first rotary driving piece; 26, rotary block; 27, first connecting rod; 31, second rotary driving piece; 32, threaded shaft sleeve; 33, screw rod; 34, mounting seat; 41, mounting hole; 42, limiting groove; 51, vibration mechanism; 52, vibration unit; 61, pressure sensor; 62, abutting block; 70, fixed block; 71, long side; 711, waist-shaped hole; 72, short side; 80, bearing barrel. DETAILED DESCRIPTION

[0042] In the following, a plurality of embodiments of the present application will be disclosed with reference to the drawings. For the purpose of clear illustration, a plurality of practical details will be described in the following description. However, it should be appreciated that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0043] It should be noted that all directional indications, such as upper, lower, left, right, front, back, and the like, used in the embodiments of the present application are only used to explain the relative position relationship, movement condition, and the like between components in a certain specific posture, such as shown in the drawings. If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, the description such as "first", "second", and the like in the present application is only for the purpose of description, and does not particularly indicate the order or sequence, nor limit the present application. It is merely for the purpose of distinguishing components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the technical features indicated or the number of technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0045] In order to further understand the utility model content, characteristics and effects of the present application, the following embodiments are exemplified, and are described in detail as follows with reference to the drawings:

[0046] Embodiment

[0047] The surface vibration compaction instrument is used for determining the maximum dry density of non-adhesive free-draining coarse-grained soil and giant-grained soil (including rockfill material); the vibration rammer plate makes vertical vibration compaction on the sample surface, the particle diamond is cut and broken, and the particle position is rearranged and moved to the stable position corresponding to the standard condition of the soil test specification, so that the soil body is compacted. During operation, the staff places the load bucket loaded with materials under the compaction mechanism, the compaction mechanism is pressed into the load bucket and abuts against the surface of the materials, and then the compaction plate is driven by the vibration mechanism to act on the materials. In order to avoid that the compaction plate can better compact the materials, the gap between the outer diameter of the compaction plate and the inner diameter of the load bucket is small, so it is necessary to ensure that the load bucket and the compaction plate are coaxial as much as possible, otherwise the problem of blocking and not being able to extend will occur. The traditional compaction tester generally needs to be adjusted by the staff for many times; in order to solve the above technical problems, the embodiment provides the following technical solutions:

[0048] Specifically, please refer to Figures 1-6 The embodiment provides a surface compaction tester capable of automatic centering, which comprises a base 11, a centering mechanism, a vertical shaft 13, a lifting driving assembly, a lifting plate 14, a vibration compaction mechanism;

[0049] Specifically, the centering mechanism is arranged on the base 11 and comprises a plurality of centering clamping jaws 22 and a centering driving assembly for driving the plurality of centering clamping jaws 22 to close;

[0050] Specifically, the vertical shaft 13 is arranged on the base 11 and comprises a plurality of centering clamping jaws 22 and a centering driving assembly for driving the plurality of centering clamping jaws 22 to close;

[0051] Specifically, the lifting plate 14 is slidably arranged between the base 11 and the fixing plate 12 in the vertical direction, and the lifting driving assembly is used for driving the lifting plate 14 to lift;

[0052] Specifically, the vibration compaction mechanism comprises a vibration unit 52 and a vibration mechanism 51, the vibration unit 52 is connected with the vibration mechanism 51, and the vibration mechanism 51 is arranged on the lifting plate 14 and is suitable for driving the vibration unit 52 to vibrate;

[0053] In the above scheme, the worker places the load bucket 80 loaded with materials on the base 11, below the vibration unit 52, and then starts the centering mechanism, and the centering drive assembly drives multiple centering clamps 22 to act simultaneously and move closer to the load bucket 80. The closed centering clamps 22 abut the outer wall of the load bucket 80 and achieve automatic centering of the load bucket 80. Understandably, the vibration unit 52 is centrally arranged during assembly. This ensures the coaxiality of the vibration unit 52 and the load bucket 80, so that it can smoothly enter the load bucket 80, and then further cooperate with the vibration mechanism 51 to generate vibration and complete the compaction test. This scheme can automatically center the load bucket 80, thereby ensuring the coaxiality of the load bucket 80 and the vibration unit 52, saving the worker's adjustment time for the load bucket 80, freeing manpower, and improving work efficiency.

[0054] It should be noted that the vibration mechanism 51 and the vibration unit 52 are relatively mature technologies in the field of compaction apparatuses, so their specific working principles and structures will not be further described. However, it can be understood that they do not affect the overall understanding of the scheme by those skilled in the art.

[0055] Specifically, please refer to Figure 4 The centering drive assembly includes a first rotary drive 25, a fixed seat 21, a rotating shaft, a rotary block 26, a first sliding rail 24, a first sliding block 23, and a first connecting rod 27.

[0056] Specifically, the first rotary drive 25 is arranged at the bottom of the fixed seat 21. The rotating shaft is arranged through the fixed seat 21, with one end connected to the driving end of the first rotary drive 25 and the other end connected to the rotary block 26.

[0057] Further, the first sliding rail 24 is arranged in several numbers and extends along the radial direction of the rotary block 26. The multiple first sliding rails 24 are distributed at equal angles. Each first sliding rail 24 has a first sliding block 23 slidingly arranged thereon. The centering clamp 22 is arranged on the first sliding block 23, and the first through hole 111 is formed in the base 11 to allow the centering clamp 22 to pass through. One end of the first connecting rod 27 is rotatably arranged on the rotary block 26, and the other end is rotatably arranged on the first sliding block 23.

[0058] In the above scheme, the first rotary drive 25 drives the rotating block 26 to rotate through the rotating shaft, and the rotating block 26 can drive the first sliding block 23 to move through the first connecting rod 27 when rotating. The first sliding block 23 is limited by the first sliding rail 24, so it can only move linearly along the extension direction of the first sliding rail 24. The centering clamp jaw 22 is arranged on the first sliding block 23, so when the first rotary drive 25 works, it can drive multiple first clamp jaws to move closer to each other or farther away from each other, and finally complete the centering and deviation correction. This scheme only needs one driving mechanism to realize the synchronous centering action of multiple centering clamp jaws 22, effectively saving the number of driving mechanisms, and the action consistency of the centering clamp jaws 22 is high.

[0059] Specifically, please refer to Figures 5-6 Further, the fixed block 70 is L-shaped, and the fixed block 70 includes a long side 71 and a short side 72. A first waist-shaped hole 711 is formed in the long side 71 along the length direction thereof;

[0060] Further, a plurality of hole groups are circumferentially arranged around the rotating block 26 on the base 11. Each hole group includes a plurality of mounting holes 41 distributed along the radial direction of the rotating block 26;

[0061] In the above scheme, after the centering mechanism completes the centering and deviation correction of the bearing barrel 80, the worker can abut the short side 72 of the fixed block 70 against the side wall of the bearing barrel 80 and abut the long side 71 against the base 11, and then lock by sequentially passing the first waist-shaped hole 711 and the mounting hole 41 through the locking bolt. In this way, the limiting stability of the bearing barrel 80 can be further enhanced, and the position of the bearing barrel 80 during vibration can be ensured to be stable. The fixed block 70 in the present scheme can also be assembled in various ways to improve the limiting stability of the bearing barrel 80. The long side 71 of the fixed block 70 is abutted against the edge of the bottom of the bearing barrel 80, and the end of the short side 72 is abutted against the base 11. Then, the locking screw is locked by passing through the first waist-shaped hole 711 and the mounting hole 41. In this way, the bearing barrel 80 can be compressed in the longitudinal direction, and the limiting and fixing in multiple dimensions can be realized by cooperating with the limiting of the side, thereby further improving the limiting stability.

[0062] Further, the hole group is arranged between the two adjacent centering clamp jaws 22;

[0063] Further, the plurality of hole groups are distributed at equal angles with the plurality of centering clamp jaws 22;

[0064] In the above scheme, the plurality of hole groups are distributed at equal angles with the centering clamp jaws 22. In this way, the common limiting can be realized from multiple angles, and the stress on the bearing barrel 80 at each angle is more uniform.

[0065] Specifically, a limiting groove 42 is arranged at one end of each hole group away from the rotating block 26, and the limiting groove 42 is suitable for limiting the short side 72 of the fixed block 70;

[0066] In the above scheme, when the fixing block 70 is installed on the base 11 at the end of the short side 72, the end of the short side 72 can extend into the limiting groove 42, and the limiting groove 42 can limit the fixing block 70 to improve the stability of the assembly.

[0067] Specifically, the vibration unit 52 is detachably arranged on the vibration mechanism 51.

[0068] Further, the detachable assembly can be achieved by cooperation of screws and threaded holes.

[0069] In the above scheme, the vibration unit 52 is detachably arranged on the vibration mechanism 51. When the barrel diameter of the test bearing barrel 80 changes, the outer diameter of the vibration unit 52 also needs to be adjusted accordingly. At this time, the vibration unit 52 with the corresponding length needs to be replaced.

[0070] Specifically, in one embodiment, the lifting driving assembly includes a lead screw 33, a threaded sleeve 32, a mounting seat 34, and a second rotary driving member 31.

[0071] Further, the second rotary driving member 31 is used to drive the threaded sleeve 32 to rotate. The lead screw 33 is in threaded cooperation with the threaded sleeve 32, and one end of the lead screw 33 is arranged on the mounting seat 34. The mounting seat 34 is fixedly connected with the lifting plate 14. The threaded sleeve 32 is rotatably arranged on the fixed plate 12.

[0072] In the above scheme, the second rotary driving member 31 is used to drive the threaded sleeve 32 to rotate. The threaded sleeve 32 is rotatably arranged on the fixed plate 12 and is in threaded cooperation with the lead screw 33. When the threaded sleeve 32 rotates, it can drive the lead screw 33 to reciprocally move along the axial direction. The lead screw 33 is connected with the mounting seat 34 on the lifting plate 14, so as to drive the lifting plate 14 to lift.

[0073] In another embodiment, the lifting driving assembly includes a lifting cylinder and a connecting shaft arranged at the driving end of the lifting cylinder. The other end of the connecting shaft is connected with the lifting plate 14.

[0074] In the above scheme, the lifting cylinder drives the lifting plate 14 to realize the lifting action through the connecting shaft.

[0075] It should be noted that the above is only a part of the implementation mode of the lifting driving assembly. In actual application, other mechanisms that can realize lifting driving can also be used, and the present application does not limit this.

[0076] Specifically, please refer to Figure 3 Figure 3 A pressure sensor 61 is arranged on the lifting plate 14, and an abutting block 62 is arranged on the side of the fixed plate 12 close to the lifting plate 14 and in the movement path of the pressure sensor 61.

[0077] In the above scheme, when the lifting plate 14 rises, the pressure sensor 61 is close to the abutting block 62, and when the lifting plate 14 rises too high, the pressure sensor 61 abuts against the abutting block 62 and sends a corresponding signal, thereby avoiding the problem of overtraveling upward movement.

[0078] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application are within the scope of the technical solutions of the present application.

Claims

1. An automatically centerable surface compaction tester characterized by: The base; The centering mechanism is arranged on the base and comprises a plurality of centering clamping jaws and a centering driving assembly for driving the centering clamping jaws to close to each other; The vertical shaft is arranged on two sides of the centering mechanism and has one end arranged on the base and the other end arranged with a fixing plate; The lifting driving assembly and the lifting plate are arranged between the base and the fixing plate in the vertical direction, and the lifting driving assembly is used for driving the lifting plate to lift; The tamping mechanism comprises a vibration unit and a vibration mechanism, the vibration unit is connected with the vibration mechanism, and the vibration mechanism is arranged on the lifting plate and is suitable for driving the vibration unit to vibrate.

2. The surface compaction tester of claim 1, wherein: The centering driving assembly comprises a first rotary driving member, a fixing seat, a rotating shaft, a rotary block, a first sliding rail, a first sliding block and a first connecting rod; The first rotary driving member is arranged at the bottom of the fixing seat, the rotating shaft is arranged through the fixing seat and has one end connected with the driving end of the first rotary driving member and the other end connected with the rotary block; The first sliding rail is arranged with a plurality of first sliding rails extending in the radial direction of the rotary block, and a plurality of first sliding rails are distributed at equal angles, each first sliding rail is slidably arranged with a first sliding block, the centering clamping jaw is arranged on the first sliding block, and a first through hole is formed on the base and is suitable for the centering clamping jaw to pass through; one end of the first connecting rod is rotatably arranged on the rotary block, and the other end is rotatably arranged on the first sliding block.

3. The surface compaction tester of claim 2, wherein: Further comprising a fixed block in L shape, the fixed block comprises a long side and a short side, a first waist-shaped hole is formed on the long side along the length direction; A plurality of groups of holes are arranged on the base around the rotary block in the circumferential direction, each group of holes comprises a plurality of mounting holes arranged at intervals in the radial direction of the rotary block.

4. The surface compaction tester of claim 3, wherein: The hole group is arranged between the two adjacent centering clamping jaws.

5. The surface compaction tester of claim 4, wherein: A plurality of hole groups and a plurality of centering clamping jaws are distributed at equal angles.

6. The surface compaction tester of claim 3, wherein: A limiting groove is arranged at one end of each hole group away from the rotary block, and the limiting groove is suitable for limiting the short side of the fixed block.

7. Surface compactness tester according to any of claims 1-6, characterized in that: The vibration unit is detachably arranged on the vibration mechanism.

8. The surface compaction tester of claim 7, wherein: The lifting driving assembly comprises a lead screw, a threaded sleeve, a mounting seat and a second rotary driving member; The second rotary driving member is used for driving the threaded sleeve to rotate, the lead screw is threadedly connected with the threaded sleeve and has one end arranged on the mounting seat, the mounting seat is fixedly connected with the lifting plate, and the threaded sleeve is rotatably arranged on the fixing plate.

9. The surface compaction tester of claim 7, wherein: A pressure sensor is arranged on the lifting plate, and an abutting block is arranged on the side of the fixing plate close to the lifting plate and in the movement path of the pressure sensor.

10. The surface compaction tester of claim 7, wherein: The lifting driving assembly comprises a lifting cylinder and a connecting shaft arranged on the driving end of the lifting cylinder, and the other end of the connecting shaft is connected with the lifting plate.

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