Soil body compaction sample preparation and demolding device

Abstract

The utility model discloses a soil body compaction sample preparation and demolding device which comprises a lower base, an upper cross beam, a screw rod, a middle partition plate, a lower servo motor, an upper servo motor, a lower worm gear lead screw elevator, a lower push cover, a mold, an upper worm gear lead screw elevator, an upper gland, a level bubble and a controller, the lower servo motor and the lower worm gear lead screw lifter are both arranged on the lower base, and a lower push cover is arranged at the upper end of a lead screw of the lower worm gear lead screw lifter. An upper servo motor and an upper worm gear lead screw lifter are arranged below the upper cross beam; an upper gland is arranged at the lower end of a lead screw of the upper worm gear lead screw lifter; a columnar compaction sample preparation hole is formed in the mold and is matched with the upper gland and the lower push cover; the two screw rods are sleeved with the middle partition plate, and the mold is arranged on the middle partition plate; and the controller is respectively connected with the lower servo motor and the upper servo motor. According to the utility model, the uniformity and repeatability of sample preparation are ensured; and sample preparation and demolding are integrated, so that simple and lossless demolding can be realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to geotechnical engineering technical field, concretely relates to a soil compaction sample preparation and demoulding device. BACKGROUND

[0002] In geotechnical engineering indoor test, due to the difficulty of undisturbed sample sampling or the small quantity of sample, and the remolded sample has a series of advantages, generally selects to use remolded soil sample to carry out test. The remolded soil sample is removed after screening treatment, and the possible existence of large particles or impurities is removed, and the relative uniformity and stability of test sample are guaranteed. In addition, the preparation process of remolded soil sample is relatively standardized, so that test operation is more convenient, and the quality and nature of test sample can be ensured to have certain consistency, so as to ensure the repeatability and comparability of experimental results. Therefore, selecting remolded soil sample to carry out test can better simulate the state of soil body in actual engineering site, and provides guarantee for the accuracy and reliability of test result. However, the current remolded sample is not uniform in density on the one hand due to the equipment reason when preparing the compaction sample, and even the local density is too high or too low, which affects the accuracy and reliability of test result. On the other hand, the remolded sample is difficult to demould after sample preparation, and the application operation of mould in demoulding process is tedious and easy to cause test sample to be damaged.

[0003] Therefore, it is necessary to design a new soil compaction sample preparation and demoulding device. SUMMARY

[0004] The utility model discloses a kind of soil compaction sample preparation and demoulding device, to solve the problems existed in the preparation process and demoulding process of current remolded sample in background art.

[0005] To achieve the above-mentioned purpose, the utility model provides a kind of soil compaction sample preparation and demoulding device, including lower base, upper crossbeam, screw rod, intermediate partition, lower servo motor, upper servo motor, lower worm gear screw lifter, lower push cover, mould, upper worm gear screw lifter, upper gland, bubble level and controller;

[0006] The lower ends of the two screw rods are arranged on the lower base, and the upper cross beam is arranged on the upper ends of the two screw rods, and a bubble level is arranged on the upper cross beam; the lower servo motor and the lower worm screw rod lifter are arranged on the lower base, the output shaft of the lower servo motor is connected with the input shaft of the lower worm screw rod lifter through a shaft coupling, and the upper end of the screw rod of the lower worm screw rod lifter is fixedly provided with a lower push cover; the upper servo motor and the upper worm screw rod lifter are arranged below the upper cross beam, the output shaft of the upper servo motor is connected with the input shaft of the upper worm screw rod lifter through a shaft coupling, and the lower end of the screw rod of the upper worm screw rod lifter is fixedly provided with an upper push cover; the mold is vertically provided with a columnar compaction sample hole, the upper end opening of the columnar compaction sample hole is matched with the upper push cover, and the lower end opening of the columnar compaction sample hole is matched with the lower push cover; the two ends of the middle partition plate are respectively sleeved on the two screw rods, the mold is arranged on the middle partition plate, the middle part of the middle partition plate is provided with a hollow part, and the hollow part does not block the process that the lower push cover enters the lower end opening of the columnar compaction sample hole; and the controller is connected with the lower servo motor and the upper servo motor through wires.

[0007] In a specific embodiment, the middle part of the screw rod of the lower worm screw rod lifter is provided with a pressure sensor, and the pressure sensor is connected with the controller through wires.

[0008] In a specific embodiment, the pressure sensor is a spoke tension and pressure sensor.

[0009] In a specific embodiment, the two ends of the middle partition plate are respectively movably sleeved on the two screw rods, and nuts matched with the screw rods are arranged above and below the position of the middle partition plate sleeved on the screw rods, so that the upward and downward movement of the middle partition plate is limited.

[0010] In a specific embodiment, nuts matched with the screw rods are arranged above and below the position of the upper cross beam on the screw rod, and the upper cross beam is fixed through the nuts arranged above and below.

[0011] In a specific embodiment, the cross section of the mold is in the shape of an inverted T, and the mold is fixed on the middle partition plate through the mold fixing through holes arranged on both sides of the bottom of the mold and bolts.

[0012] In a specific embodiment, the lower servo motor and the upper servo motor are speed-adjustable servo motors.

[0013] In a specific embodiment, the cross section of the columnar compaction sample hole is circular or rectangular.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model adopts bidirectional uniformity static force compaction sample preparation, guarantees the uniformity and repeatability of sample preparation.

[0016] The utility model is provided with stress sensor, can realize compaction sample preparation under the condition of limited compaction work.

[0017] The utility model is provided with stress sensor, can realize compaction sample preparation under the condition of limited compaction work.

[0018] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings that form a part of this application are intended to provide further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0020] Figure 1 It is the schematic diagram of one embodiment of the utility model;

[0021] Wherein, 1, lower base plate;2, upper crossbeam;3, screw rod;4, intermediate partition;5, lower servo motor;6, upper servo motor;7, lower worm gear screw rod elevator;8, lower push cover;9, mould;10, upper worm gear screw rod elevator;11, upper gland;12, level bubble;13, controller;14, pressure sensor. DETAILED DESCRIPTION

[0022] The embodiments of the utility model are described in detail below in combination with the drawings, but the utility model can be implemented in multiple different modes limited and covered by the claims.

[0023] Embodiment 1

[0024] The utility model provides a kind of soil compaction sample preparation and demoulding device, including lower base plate 1, upper crossbeam 2, screw rod 3, intermediate partition 4, lower servo motor 5, upper servo motor 6, lower worm gear screw rod elevator 7, lower push cover 8, mould 9, upper worm gear screw rod elevator 10, upper gland 11, level bubble 12 and controller 13;

[0025] The lower end of two screw rods 3 is arranged on lower base plate 1, and upper crossbeam 2 is arranged on the upper end of two screw rods 3, and level bubble 12 is arranged on upper crossbeam 2;The level of the entire device is guaranteed by level bubble.Lower base plate 1, upper crossbeam 2 and screw rod 3 constitute the support of the entire device, and the entire support is rigid, and is not deformed by reaction force.

[0026] The lower servo motor 5 and the lower worm screw lifter 7 are arranged on the lower base 1 by bolts, the output shaft of the lower servo motor 5 is connected with the input shaft of the lower worm screw lifter 7 through a shaft coupling, and the upper end of the screw rod of the lower worm screw lifter 7 is fixedly provided with a lower push cover 8; the upper servo motor 6 and the upper worm screw lifter 10 are arranged below the upper cross beam 2 by bolts, the output shaft of the upper servo motor 6 is connected with the input shaft of the upper worm screw lifter 10 through a shaft coupling, and the lower end of the screw rod of the upper worm screw lifter 10 is fixedly provided with an upper push cover 11.

[0027] The speed of the screw rod of the lower worm screw lifter 7 and the upper worm screw lifter 10 driven by the lower servo motor 5 and the upper servo motor 6 can be adjusted, and the speed adjustment range is 0.001 mm / min to 5 mm / min.

[0028] The mold 9 is vertically provided with a columnar compaction sample hole, the upper end opening of the columnar compaction sample hole is matched with the upper push cover 11, and the lower end opening of the columnar compaction sample hole is matched with the lower push cover 8; the two ends of the intermediate partition plate 4 are respectively sleeved on the two screw rods 3, the mold 9 is arranged on the intermediate partition plate 4, the intermediate partition plate 4 is provided with a hollow portion in the middle, the hollow portion does not block the process that the lower push cover 8 enters the lower end opening of the columnar compaction sample hole, and the upper push cover 11 and the lower push cover 8 are threadedly connected on the screw rod, and the shape and size of the upper push cover 11 and the lower push cover 8 can be adjusted and replaced according to the needs of the mold.

[0029] The controller 13 is connected with the lower servo motor 5 and the upper servo motor 6 through wires.

[0030] The middle part of the screw rod of the lower worm screw lifter is provided with a pressure sensor 14, and the pressure sensor 14 is connected with the controller 13 through wires. The pressure sensor 14 is a spoke type tension and pressure sensor. The pressure sensor can measure the pressure range of 0-10 MPa, the accuracy is ±1 kPa, the pressure sensor can monitor the stress state of the screw rod, and in the case of constant compaction work, the controller can be fed back through the pressure sensor to control the movement of the servo motor.

[0031] The two ends of the intermediate partition plate 4 are movably sleeved on the two screw rods 3, and the positions of the intermediate partition plate 3 on the screw rods 3 are provided with nuts matched with the screw rods 3 above and below, and the nuts arranged above and below limit the upward and downward movement of the intermediate partition plate 4.

[0032] The positions of the upper cross beam 2 on the screw rods 3 are provided with nuts matched with the screw rods 3 above and below, and the upper cross beam 2 is fixed by the nuts arranged above and below.

[0033] The profile of the mold 9 is inverted T-shaped, and the mold 9 is provided with mold fixing through holes on both sides of the bottom, and bolts are used to fix the mold on the middle partition plate 4. The mold 9 is a stainless steel mold.

[0034] The lower servo motor 5 and the upper servo motor 6 are speed-adjusting servo motors.

[0035] The cross section of the columnar compaction sample hole is circular or rectangular.

[0036] Taking the preparation of a cylindrical sample with a diameter of 38 mm and a height of 76 mm as an example, the cross section of the columnar compaction sample hole is a circle with a diameter of 38 mm, the height of the columnar compaction sample hole is 116 mm, and the length of the columnar compaction sample hole of the mold is 40 mm longer than the length of the corresponding target sample, which facilitates pouring the loose soil sample at the beginning.

[0037] The sample preparation process is as follows: first, adjust the lower servo motor to move the lower push cover to the bottom of the mold, so that the lower push cover is flush with the bottom of the mold, apply vaseline to the inner wall of the mold, the upper pressure cover and the lower push cover, put the loose soil sample with the rated mass into the mold, and then adjust the upper servo motor to move the upper pressure cover downward, when the stress sensor appears stress, control the upper servo motor and the lower servo motor at the same speed, for example, select the speed of 0.1 mm / min for bidirectional compaction. From the start of the servo motor movement, the controller records and controls the distance between the upper pressure cover and the lower push cover, and when the distance between the upper pressure cover and the lower push cover reaches the rated distance, i.e. 76 mm, the sample preparation is completed.

[0038] The demolding process is as follows: control the upper servo motor to move the upper pressure cover back to the initial position, then open the lower servo motor to move the lower push cover upward at a uniform speed to push the soil sample out of the mold, and stop the movement when the sample is completely separated from the mold.

[0039] The above is a further detailed description of the utility model in combination with specific preferred embodiments, and cannot be regarded as the specific implementation of the utility model being limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions and substitutions can be made, which should be regarded as falling within the protection scope of the utility model.

Claims

1. A soil compaction sampling and demolding device, characterized by, It comprises lower base (1), upper crossbeam (2), screw rod (3), middle partition (4), lower servo motor (5), upper servo motor (6), lower worm screw rod elevator (7), lower push cover (8), mold (9), upper worm screw rod elevator (10), upper pressure cover (11), bubble level (12) and controller (13). The lower ends of the two screw rods (3) are arranged on the lower base (1), the upper crossbeam (2) is arranged on the upper ends of the two screw rods (3), and the bubble level (12) is arranged on the upper crossbeam (2); the lower servo motor (5) and the lower worm screw rod elevator (7) are both arranged on the lower base (1), the output shaft of the lower servo motor (5) is connected with the input shaft of the lower worm screw rod elevator (7) through a shaft coupling, and the upper end of the screw rod of the lower worm screw rod elevator (7) is fixedly provided with the lower push cover (8); the upper servo motor (6) and the upper worm screw rod elevator (10) are both arranged below the upper crossbeam (2), the output shaft of the upper servo motor (6) is connected with the input shaft of the upper worm screw rod elevator (10) through a shaft coupling, and the lower end of the screw rod of the upper worm screw rod elevator (10) is fixedly provided with the upper pressure cover (11); the mold (9) is vertically provided with a columnar compaction sample hole, the upper end opening of the columnar compaction sample hole is matched with the upper pressure cover (11), and the lower end opening of the columnar compaction sample hole is matched with the lower push cover (8); the two ends of the middle partition (4) are respectively sleeved on the two screw rods (3), the mold (9) is arranged on the middle partition (4), the middle portion of the middle partition (4) is provided with a hollow portion, the hollow portion does not block the process that the lower push cover (8) enters the lower end opening of the columnar compaction sample hole, and the controller (13) is connected with the lower servo motor (5) and the upper servo motor (6) through wires.

2. The soil compaction sampling and demolding apparatus according to claim 1, wherein, The middle portion of the screw rod of the lower worm screw rod elevator is provided with a pressure sensor (14), and the pressure sensor (14) is connected with the controller (13) through wires.

3. The soil compaction sampling and demolding apparatus according to claim 2, wherein, The pressure sensor (14) is a spoke type tension and pressure sensor.

4. The soil compaction sampling and demolding apparatus according to claim 1, wherein, The two ends of the middle partition (4) are movably sleeved on the two screw rods (3), and nuts matched with the screw rods (3) are arranged above and below the positions where the middle partition is sleeved on the screw rods (3), so that the upward and downward movement of the middle partition (4) is limited by the nuts arranged above and below.

5. The soil compaction sampling and demolding apparatus of claim 1, wherein, Nuts matched with the screw rods (3) are arranged above and below the position of the upper crossbeam (2) on the screw rods (3), and the upper crossbeam (2) is fixed by the nuts arranged above and below.

6. The soil compaction sampling and demolding apparatus of claim 1, wherein, The cross section of the mold (9) is inverted T-shaped, the mold (9) is provided with mold fixing through holes on both sides of the bottom, and the mold is fixed on the middle partition (4) by bolts penetrating through the mold fixing through holes.

7. The soil compaction sampling and demolding apparatus according to claim 1, wherein, The lower servo motor (5) and the upper servo motor (6) are both speed-adjusting servo motors.

8. The soil compaction sampling and demolding apparatus of claim 1, wherein, The cross section of the columnar compaction sample hole is circular or rectangular.

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