Flattening device for testing minimum dry density of sand

Abstract

The utility model provides a leveling device for testing the minimum dry density of sand, which belongs to the technical field of geotechnical test devices and comprises a measuring cylinder, a support arranged at an opening in the upper part of the measuring cylinder, a bracket arranged at the upper part of the support, a connecting rod vertically arranged at the center of the bracket, and annular racks uniformly arranged on the surface of the connecting rod at intervals, gears located on the two sides of the connecting rod are fixedly arranged in the support, the annular rack of the connecting rod is meshed with the gears, and one gear is connected with one end of a support crank. The sand surface leveling device can solve the problem that an existing sand surface leveling device is low in precision.

Description

TECHNICAL FIELD

[0001] The utility model belongs to geotechnical test device technical field relates to a kind of for testing the minimum dry density of sand's flatness device. BACKGROUND

[0002] National standard "geotechnical test method standard GBT50123-2019" stipulates that the minimum dry density test of sand is determined using funnel method and measuring cylinder method.Each time before measuring volume, sand surface flatness device is used to flatten sand surface, Chinese utility model patent "CN205636705U a sand surface flatness device with auxiliary vertical device, disclosure date is October 12, 2016" discloses a kind of flatness device, the length of the flatness device is fixed, in the case where the amount of sand is less in test, sand surface cannot be touched.Furthermore, the existing flatness device is manually inserted into the flatness head, and the sand surface is disturbed when inserting and leaving the sand surface, so that the sand surface cannot be flattened, and the sand surface is flattened by rotating the rod of the flatness device with one hand, the flatness precision is low, and the fluctuation of the sand surface causes reading difficulty, resulting in inaccurate test results, and it is difficult to ensure the stability of test data.Therefore, a flatness device that can accurately flatten the sand surface is needed. SUMMARY

[0003] To achieve the above purpose, the utility model provides a kind of for testing the minimum dry density of sand's flatness device, solve the problem of low precision of existing sand surface flatness device.

[0004] To solve the above technical problems, the utility model adopts the technical scheme of a kind of for testing the minimum dry density of sand's flatness device, including measuring cylinder, the seat is arranged at the opening of the upper part of the measuring cylinder, the support is arranged at the upper part of the seat, the connecting rod is vertically arranged in the center of the support, the annular rack that is evenly spaced is arranged on the surface of the connecting rod, the gear is fixedly arranged in the support on both sides of the connecting rod, and one of the gears is connected with the one end of the seat crank.

[0005] Further, the one end of the upper crank is connected with the top end of the connecting rod, the flatness head is arranged at the tail end of the connecting rod, and the flatness head is located in the measuring cylinder.

[0006] Further, the lower part of the seat is in the shape of an inverted cone with a central circular hole, and the surface of the seat is covered with rubber skin with a plurality of horizontal reference lines engraved.

[0007] Further, the fish eye level is arranged on the upper part of the support.

[0008] Further, the other end of the seat crank is connected with the seat handle.

[0009] Further, the one end of the seat crank passes through the damper and is connected with the gear.

[0010] Further, the rubbing head is composed of a rubber strip and a clamp, the clamp is connected with the connecting rod at the center, and the clamp is provided with a cross-shaped clamping groove to fixedly connect the rubber strip.

[0011] The utility model discloses beneficial effect is:

[0012] (1) the utility model discloses a connecting rod and gear are set up on the upper portion of the measuring cylinder, the connecting rod is driven to ascend or descend by the gear mechanical drive, can accurately control the position of the rubbing head contact sand surface, and the rubbing head can be accurately rubbed flat sand surface by rotating the upper portion handle, avoid the error caused by manual rubbing flat to cause the result not accurate, and the connecting rod is ensured to be located in the central position of the measuring cylinder by the connecting rod passing through the center round hole of the inverted conical portion of the support, limit the connecting rod swing and improve the test precision.

[0013] (2) the utility model discloses the flatness of sand surface that rubbing flat sand surface is ensured by three aspects of measuring cylinder scale, the horizontal reference line of the inverted conical portion of the support, fish eye level, compared with prior art operation is simpler, easy to start, and the rubbing speed is faster, the effect is better, and the test result is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.

[0015] Figure 1 It is the front view of the utility model.

[0016] Figure 2 It is the top view of the utility model.

[0017] Figure 3 It is Figure 1 The rubbing head structure diagram.

[0018] Figure 4 It is Figure 1 The rubbing head structure deformation drawing.

[0019] Figure 5 It is Figure 1 The connecting rod structure diagram.

[0020] In the drawing, 1, upper handle;2, upper handle;3, support handle;4, support handle;5, support;6, measuring cylinder;7, rubbing head;8, connecting rod;9, gear;10, support;11, damper;12, rubber strip;13, clamp;14, fish eye level. DETAILED DESCRIPTION

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1-5 As shown, this utility model provides a leveling device for testing the minimum dry density of sand, including a measuring cylinder 6, a support 10 is provided at the upper opening of the measuring cylinder 6, the lower part of the support 10 is an inverted cone shape with a central circular hole, and the surface of the support 10 is covered with a rubber skin, which can increase the friction between the support 10 and the measuring cylinder 6, making it less likely to slip during use.

[0023] A bracket 5 is mounted on the upper part of the support 10. A connecting rod 8 is vertically mounted at the center of the bracket 5. The top end of the connecting rod 8 is connected to one end of the upper crank handle 2, and a smoothing head 7 is mounted at the tail end of the connecting rod 8, located inside the measuring cylinder 6. The other end of the upper crank handle 2 is connected to the upper grip 1. Rotating the upper grip 1 causes the connecting rod 8 to rotate the smoothing head 7, which is used to smooth the sanded surface. The upper grip 1 is a cylindrical plastic material that protects the palm during operation.

[0024] The rubber sheet of support 10 is engraved with multiple horizontal reference lines. A fisheye level 14 is installed on the upper part of bracket 5. During installation and use, the fisheye level 14 is used to ensure the leveler is horizontal, and the horizontal reference lines of support 10 are kept parallel to the scale lines of measuring cylinder 6 to accurately level the sand surface. The inverted conical part of support 10 can automatically center the central hole, ensuring that connecting rod 8 is located in the exact center of measuring cylinder 6, while the central hole can limit the back-and-forth and left-and-right swing of connecting rod 8.

[0025] The connecting rod 8 has evenly spaced annular racks on its middle surface. Gears 9 are fixedly mounted on both sides of the connecting rod 8 inside the bracket 5, and the annular racks of the connecting rod 8 mesh with the gears 9. One end of the support handle 4 passes through the damper 11 and connects to one of the gears 9. The other end of the support handle 4 is connected to the support grip 3. Rotating the support grip 3 controls the rotation of the gear 9, thereby causing the connecting rod 8 to rise or fall. The damper 11 provides damping to the support handle 4, preventing it from rotating under gravity. The support grip 3 is made of cylindrical plastic to protect the hand during operation.

[0026] The smoothing head 7 consists of a rubber strip 12 and a clamp 13. The surface of the rubber strip 12 is coated with polytetrafluoroethylene. The center of the clamp 13 is connected to the connecting rod 8. The clamp 13 is provided with a cross-shaped slot for fixing and clamping the rubber strip 12.

[0027] The operation steps of this utility model are as follows:

[0028] Firstly, the leveling head is installed, the connecting rod 8 with a proper length is selected according to the depth of the measuring cylinder 6 and the amount of sand for test, the connecting rod 8 is sequentially connected with the upper handle 2 and the upper grip 1, and the connecting rod 8 is passed through the hole in the middle of the two gears 9 arranged on the support 5, and then passed through the center hole of the inverted conical part of the support 10, after the lower part of the connecting rod 8 is extended out of the center hole, the leveling head 7 slightly larger than the diameter of the measuring cylinder 6 is selected and connected with the connecting rod 8, and then the installation is completed.

[0029] When the sand surface needs to be leveled, the sand sample is loaded in the measuring cylinder 6, the leveling head 7 is rotated in the clockwise direction, the four rubber strips 12 arranged in the cross shape of the leveling head 7 are bent to extend into the measuring cylinder 6, the support 10 is placed on the measuring cylinder 6 and then is finely adjusted, the horizontal bubble of the fisheye level 14 is centered, and the horizontal reference line of the support 10 is parallel to the scale on the opening of the measuring cylinder 6, then one hand holds the measuring cylinder 6 and the support 10, and the other hand slowly shakes the support grip 3, the leveling head 7 and the connecting rod 8 slowly descend, and the descending is stopped when the leveling head 7 just contacts the sand surface, the upper grip 1 is slowly rotated in the clockwise direction, at this time, the leveling head 7 closely adheres to the inner wall of the measuring cylinder 6 and rotates to level the sand surface, after leveling, the support grip 3 is slowly shaken, the leveling head 7 and the connecting rod 8 are lifted by 1cm to be separated from the sand surface, and the support 10 is pulled out of the measuring cylinder 6. The utility model can reduce the error of manual operation of the test operator and improve the measurement accuracy.

[0030] Each embodiment in the specification is described in a related manner, the same and similar parts between each embodiment can be referred to each other, and each embodiment mainly describes the difference from other embodiments.

[0031] The above only describes the preferred embodiments of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A screed for testing the minimum dry density of a sand comprising a graduated cylinder (6) characterised in that, The support (10) is arranged on the upper opening of the measuring cylinder (6), the support (5) is arranged on the upper part of the support (10), the connecting rod (8) is vertically arranged in the center of the support (5), the connecting rod (8) is provided with a ring gear which is evenly spaced on the surface, the gear (9) is fixedly arranged on both sides of the connecting rod (8) in the support (5), the ring gear of the connecting rod (8) is engaged with the gear (9), and one of the gears (9) is connected with one end of the support handle (4).

2. A slicker for testing the minimum dry density of a sand according to claim 1, wherein, The top end of the connecting rod (8) is connected with one end of the upper handle (2), the flat head (7) is arranged at the tail end of the connecting rod (8), the flat head (7) is arranged in the measuring cylinder (6), and the other end of the upper handle (2) is connected with the upper handle (1).

3. A slicker for testing the minimum dry density of a sand according to claim 1, wherein, The lower part of the support (10) is in the shape of an inverted cone with a central circular hole, the surface of the support (10) is covered with rubber skin which is dyed with a plurality of horizontal reference lines, and the horizontal reference lines of the support (10) are parallel to the scale lines of the measuring cylinder (6).

4. A slicker for testing the minimum dry density of a sand according to claim 1, wherein, The fish-eye level (14) is arranged on the upper part of the support (5).

5. A slicker for testing the minimum dry density of a sand according to claim 1, wherein, The other end of the support handle (4) is connected with the support handle (3).

6. A slicker for testing the minimum dry density of a sand according to claim 1, wherein, One end of the support handle (4) is connected with the gear (9) through the damper (11).

7. A slicker for testing the minimum dry density of a sand according to claim 2, wherein, The flat head (7) is composed of a rubber strip (12) and a clamp (13), the clamp (13) is connected with the connecting rod (8) in the center, and the clamp (13) is provided with a cross-shaped clamping groove for fixedly connecting the rubber strip (12).

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