Sample compacting device for geotechnical experiment

Abstract

The utility model discloses a sample compacting device for geotechnical experiments, which comprises a test mold, a plurality of sample grooves are arranged on the test mold at intervals along the length direction of the test mold, a compacting mechanism is slidably connected on the test mold along the length direction of the test mold, and the compacting mechanism comprises two vertical plates arranged in parallel and a balancing weight positioned between the two vertical plates. The vertical plates are in sliding connection with the side face of the test mold, sliding grooves are vertically formed in the opposite faces of the two vertical plates, connecting pieces connected into the sliding grooves in a sliding mode are arranged at the two ends of the balancing weight, and the lower end of the balancing weight is a compaction end matched with the shape of the test sample groove. And after the balancing weight falls down, the compaction end is pressed into the sample groove. According to the utility model, in the sample preparation process of the multi-united test mold, compaction can be realized by virtue of the constant gravity of the balancing weight of the device, the non-uniformity caused by manual compaction is avoided, and the accuracy of a mechanical property experiment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of geotechnical experiment, specifically relates to a sample compaction device for geotechnical experiment. BACKGROUND

[0002] The progress and development of soil mechanics depend on the continuously accumulated experimental data. In order to obtain real and reliable data, a large number of geotechnical experiments must be carried out, and one of the basic works of these experiments is the preparation of samples. Sample preparation involves mixing materials and loading them into a specific mold to form standard samples. For the preparation of large samples, special sample preparation machines are usually used; for the preparation of small samples, multi-union test molds are more commonly used. Multi-union test mold is a commonly used tool in geotechnical experiments, which is used to make multiple standard samples of the same size for subsequent various geotechnical tests. It has multiple sample grooves along a straight line, which can produce multiple samples at the same time, improving the efficiency of the experiment.

[0003] However, the small size of the small samples prepared by the existing multi-union test mold is small, for example, a six-union test mold is generally used to prepare a 20mm x 20mm x 20mm cube sample. Due to the size limitation of these samples, they cannot be compacted by using the common sample preparation machine in the laboratory, and can only be compacted by hand hammering and using a scraper to flatten the surface of the sample. This method not only makes it difficult to ensure that the sample material is evenly filled into the mold, but also may cause uneven compaction, affecting the microstructure of the sample and adversely affecting the accuracy of the mechanical property experiment. SUMMARY

[0004] The purpose of the utility model is to provide a sample compaction device for geotechnical experiment, which can realize compaction by relying on the constant gravity of the device counterweight during the sample preparation process of the multi-union test mold, avoid unevenness caused by manual compaction, and improve the accuracy of the mechanical property experiment.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is: a sample compaction device for geotechnical experiment, comprising a test mold, a plurality of sample grooves are arranged on the test mold along the length direction thereof at intervals, a compaction mechanism is slidably connected to the test mold along the length direction thereof, the compaction mechanism comprises two vertical plates arranged in parallel and a counterweight located between the two vertical plates, the vertical plates are slidably connected to the side surface of the test mold, a sliding groove is vertically arranged on the opposite side of the two vertical plates, the counterweight is provided with connecting pieces slidably connected in the sliding groove at both ends, the lower end of the counterweight is a compaction end matched with the shape of the sample groove, and the compaction end of the counterweight falls into the sample groove.

[0006] The further improved scheme of the utility model is that the top of the two vertical plates is equipped with a top plate, the top plate is equipped with a lifting assembly for lifting the counterweight, the lifting assembly comprises a motor, the top plate is equipped with a through hole and a plurality of pulleys, the upper end of the counterweight is equipped with a traction rope, the traction rope passes through the through hole and is connected with the motor output shaft after passing through the plurality of pulleys.

[0007] The further improved scheme of the utility model is that the connecting piece comprises a horizontal rod, one end of the horizontal rod is connected with the counterweight, and the other end is rotatably connected with a roller located in the sliding groove, and the rollers on the two sides of the counterweight are in contact with the groove bottoms of the sliding grooves of the two vertical plates.

[0008] The further improved scheme of the utility model is that the rollers are rotatably connected on the two side faces of one end of the horizontal rod, and the distance between the opposite faces of the two rollers is matched with the width of the sliding groove.

[0009] The further improved scheme of the utility model is that the distance between the two vertical plates is matched with the width of the test mold, and the vertical plates are in sliding contact with the side faces of the test mold.

[0010] The further improved scheme of the utility model is that the side face of the test mold is equipped with an identification corresponding to each test sample groove, and when one side of the vertical plate is located at the identification position, the compaction end is located directly above the test sample groove corresponding to the identification.

[0011] The further improved scheme of the utility model is that a scale is vertically arranged on the vertical plate.

[0012] The utility model has the advantages of:

[0013] The utility model can compact the test sample during the sample preparation of the multiple test mold, realizes the compaction by the constant gravity of the counterweight of the device, replaces the manual hammer, avoids the uneven stress caused by the manual hammering, guarantees the compaction effect of the test sample, improves the compaction efficiency, guarantees the uniformity of the internal structure and the reliability of the data of the later mechanical property experiment such as the compression strength.

[0014] The two vertical plates can slide along the length direction of the test mold, the plurality of test sample grooves on the multiple test mold can be compacted one by one, the counterweight and the test sample groove are positioned by the identification, the next test sample groove can be quickly moved after the compaction of one test sample groove, and the compaction efficiency is effectively improved.

[0015] The utility model discloses a motor drives counterweight to lift, and when needing the counterweight to fall, the motor is powered off, and the motor output shaft rotates freely after being powered off, and then realizes the falling of the counterweight, can replace manpower to lift the counterweight, reduces the manpower consumption, and the motor control is more accurate, can improve the accuracy of counterweight lifting height. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure main view schematic drawing of the utility model.

[0017] Figure 2 It is the structure main view sectional partial enlarged view schematic drawing of the utility model.

[0018] Figure 3 It is the structure side view schematic drawing of the utility model.

[0019] Figure 4 It is the structure side view sectional schematic drawing of the utility model.

[0020] In the drawing, 1 - test mould, 2 - test sample groove, 3 - vertical plate, 4 - counterweight, 5 - sliding slot, 6 - compaction end, 7 - top plate, 8 - motor, 9 - pulley, 10 - traction rope, 11 - cross bar, 12 - roller, 13 - mark. DETAILED DESCRIPTION

[0021] The utility model is further illustrated below in connection with the drawings and specific embodiments. EMBODIMENT

[0022] In combination Figures 1-3 It can be known that a test sample compaction device for soil test includes a test mould 1, a plurality of test sample grooves 2 are arranged on the test mould 1 at intervals along the length direction of the test mould 1, a compaction mechanism is slidably connected to the test mould 1 along the length direction of the test mould 1, the compaction mechanism includes two vertical plates 3 arranged in parallel and a counterweight 4 located between the two vertical plates 3, the vertical plate 3 is slidably connected to the side surface of the test mould 1, a sliding slot 5 is vertically arranged on the opposite side of the two vertical plates 3, the two ends of the counterweight 4 are provided with connecting pieces slidably connected in the sliding slot 5, the lower end of the counterweight 4 is a compaction end 6 matched with the shape of the test sample groove 2, and the compaction end 6 is pressed into the test sample groove 2 after the counterweight 4 falls.

[0023] The test mould 1 is a conventional six-unit test mould for soil sample test in the prior art, which includes a bottom plate, two forming plates are detachably connected to the bottom plate, the two forming plates abut and the opposite side of each of the two forming plates is provided with a half slot, the two half slots are matched to form the test sample groove 2, the six-unit test mould is a cuboid as a whole, and the two vertical plates 3 of the utility model are slidably connected to the side surface of the cuboid.

[0024] Optionally, the utility model discloses the traction rope 10 on the counterweight 4 upper end is equipped with, uses the hand -held traction rope 10 to drive the counterweight 4 to ascend, reaches the specified height after hand -off makes the counterweight 4 free fall and falls to the raw material in the sample groove 2 is compacted.

[0025] Optionally, the utility model discloses the counterweight 4 can also be driven to ascend by the lifting assembly instead of manpower, and the lifting assembly is the conventional component that can realize lifting traction in prior art. Preferably, the top of the two vertical boards 3 is equipped with the top plate 7, the top plate 7 is equipped with the lifting assembly that drives the counterweight 4 to lift, and the lifting assembly includes motor 8, the top plate 7 is equipped with the through -hole and a plurality of pulleys 9, and the upper end of the counterweight 4 is equipped with the traction rope 10, and the traction rope 10 passes through the through -hole and passes through a plurality of pulleys 9 and is connected with the output shaft of motor 8.

[0026] Among them, motor 8 can select brushless DC motor or servo motor, and the brushless DC motor in prior art has no brush and commutator, so that there is almost no resistance after power failure, and the counterweight 4 can naturally fall. The servo motor in prior art has high precision and programmability, and can reduce resistance through internal mechanism (such as zero torque mode) after power failure, so as to minimize the influence on the falling of the counterweight 4.

[0027] Optionally, the connecting piece includes a cross bar 11, one end of the cross bar 11 is connected with the counterweight 4, the other end is slidingly connected in the sliding groove 5, and the counterweight 4 can be guided when falling to limit its swing, so that the counterweight 4 realizes vertical lifting, and the precision of compaction is improved.

[0028] Optionally, the connecting piece includes a cross bar 11, one end of the cross bar 11 is connected with the counterweight 4, the other end is slidingly connected in the sliding groove 5, and the counterweight 4 can be guided when falling to limit its swing, so that the counterweight 4 realizes vertical lifting, and the precision of compaction is improved.

[0029] The distance between the two vertical boards 3 is adapted to the width of the test mould 1, and the vertical board 3 and the side surface of the test mould 1 are in sliding contact. The side surface of the test mould 1 is provided with an identification 13 corresponding to each sample groove 2, and when one side of the vertical board 3 is located at the identification 13 position, the compaction end 6 is located directly above the sample groove 2 corresponding to the identification 13. A scale is vertically arranged on the vertical board 3.

[0030] The working principle of the sample compaction device for geotechnical experiment is as follows: during work, firstly, the material is filled into the sample groove 2 and is preliminarily scraped flat by the scraper, so that the material surface in the sample groove 2 is basically flat. The vertical plate 3 is moved along the length direction of the test mold 1, the counterweight block 4 is located directly above the sample groove 2 according to the mark 13, the motor 8 is started to wind the traction rope 10, and then the lifting of the counterweight block 4 is realized; when the counterweight block 4 reaches the specified height, the motor 8 is powered off, the motor output shaft rotates freely after power-off, and the counterweight block 4 can naturally fall. The counterweight block 4 freely falls along the chute 5 through the connecting pieces on the two sides, and the constant force and uniform compaction of the sample material are realized.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Any equivalent structure or equivalent process conversion made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A sample compaction device for geotechnical experiments, comprising a test mold (1), wherein a plurality of sample grooves (2) are spaced apart along the length of the test mold (1), characterized in that: A compaction mechanism is slidably connected to the mold (1) along its length. The compaction mechanism includes two parallel vertical plates (3) and a counterweight (4) located between the two vertical plates (3). The vertical plates (3) are slidably connected to the side of the mold (1). A groove (5) is vertically provided on the opposite side of the two vertical plates (3). The two ends of the counterweight (4) are provided with connectors slidably connected in the groove (5). The lower end of the counterweight (4) is a compaction end (6) that matches the shape of the sample groove (2). After the counterweight (4) falls, the compaction end (6) is pressed into the sample groove (2).

2. The sample compaction device for geotechnical testing according to claim 1, characterized in that: A top plate (7) is provided on the top of the two vertical plates (3). The top plate (7) is provided with a lifting assembly that drives the counterweight (4) to lift. The lifting assembly includes a motor (8). The top plate (7) is provided with a through hole and several pulleys (9). The upper end of the counterweight (4) is provided with a traction rope (10). The traction rope (10) passes through the through hole and several pulleys (9) and then connects to the output shaft of the motor (8).

3. A sample compaction device for geotechnical testing according to claim 1 or 2, characterized in that: The connector includes a crossbar (11), one end of which is connected to the counterweight (4), and the other end is rotatably connected to a roller (12) located in the groove (5). The rollers (12) on both sides of the counterweight (4) respectively contact the bottom of the groove (5) of the vertical plates (3) on both sides.

4. The sample compaction device for geotechnical testing according to claim 3, characterized in that: Rollers (12) are rotatably connected to both sides of one end of the crossbar (11), and the distance between the opposite sides of the two rollers (12) is adapted to the width of the groove (5).

5. The sample compaction device for geotechnical testing according to claim 1, characterized in that: The spacing between the two vertical plates (3) is adapted to the width of the test mold (1), and the vertical plates (3) slide in contact with the side of the test mold (1).

6. The sample compaction device for geotechnical testing according to claim 1, characterized in that: The side of the test mold (1) is provided with a mark (13) corresponding to each sample groove (2). When one side of the vertical plate (3) is located at the mark (13), the compaction end (6) is located directly above the sample groove (2) corresponding to the mark (13).

7. The sample compaction device for geotechnical testing according to claim 1, characterized in that: The vertical plate (3) is vertically marked with graduations.

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