Soil sample propelling device of direct shear apparatus

Abstract

The utility model discloses a soil sample propelling device of a direct shear apparatus, and relates to the technical field of direct shear apparatuses, the propelling stability of a soil sample is improved, the propelling device comprises a centering frame, a push rod and a push disc, and the push disc is rotationally connected to one end of the push rod; a through hole allowing the push rod to be connected in a sliding mode is formed in the middle of the centering frame, a curve groove extending in the axial direction of the push rod is formed in the periphery of the push rod, a guide column matched with the curve groove is fixed to the hole wall of the through hole, the push rod is connected to the through hole in a sliding mode, and the guide column is located in the curve groove; the centering frame is erected on the cutting ring, so that the push disc is aligned to a soil sample in the cutting ring. According to the application, the damage to the soil sample in the process of pushing the soil sample into the shear box can be reduced, so that the accuracy of test results is improved.

Description

Technical Field

[0001] This application relates to the field of direct shear apparatus technology, and in particular to a soil sample propulsion device for a direct shear apparatus. Background Technology

[0002] The direct shear test is a common method for determining the shear strength of soil. Currently, the direct shear test involves placing a soil sample into a shear box, which consists of an upper box and a lower box. The upper box is fixed, while the lower box can slide horizontally. Vertical pressure is applied to the soil sample, and then horizontal shear force is applied to the lower box in stages until the sample is sheared and broken. This is a common method for determining the shear strength of soil.

[0003] However, the traditional method requires pre-loading the soil sample into a ring cutter mold to form a cylindrical soil sample that fits the shear box. Then, the soil sample is placed along with the ring cutter into a slot at the top of the shear box. Next, the operator uses a pusher to push the soil sample from the ring cutter mold into the shear box. In this step, the operator needs to press down on the pusher with their fingers to make the soil sample fall into the shear box.

[0004] The above method has a problem: the force applied when pushing the plate down with your fingers is uneven, which may damage the soil sample during the pushing process and thus affect the test results. Utility Model Content

[0005] To improve the smoothness of soil sample propulsion, this application provides a soil sample propulsion device for a direct shear apparatus.

[0006] This application provides a soil sample propulsion device for a direct shear apparatus, employing the following technical solution:

[0007] A soil sample propulsion device for a direct shear apparatus includes a centering frame, a push rod, and a push plate. The push plate is rotatably connected to one end of the push rod. A through hole for sliding connection of the push rod is formed in the middle of the centering frame. A curved groove extending along the axial direction of the push rod is formed on the outer periphery of the push rod. A guide post adapted to the curved groove is fixed on the wall of the through hole. The push rod is slidably connected to the through hole, and the guide post is located in the curved groove. The centering frame is mounted on a ring cutter, so that the push plate is aligned with the soil sample inside the ring cutter.

[0008] By adopting the above technical solution, and by setting up a centering frame, push rod, and push plate, with the push plate and push rod rotating together, and the guide column on the centering frame and the curved groove on the push rod working together, the push plate can be kept centered when pushing the soil sample, avoiding the problem of uneven force caused by finger pressure in traditional methods. This design can reduce the damage to the soil sample during the pushing into the shear box, thereby improving the accuracy of the test results.

[0009] Optionally, the centering frame includes a centering plate and centering legs, and the through hole of the centering frame is located at the axis of the centering plate; multiple centering legs are provided, and the multiple centering legs are distributed at equal intervals around the axis of the centering plate.

[0010] By adopting the above technical solutions, the stability of the central frame and the ability to evenly distribute the stress on the soil samples were improved.

[0011] Optionally, a top cap is fixed to the end of the push rod away from the push plate.

[0012] By adopting the above technical solution, a point of force application is provided for the operator, making the soil sample advancement process more convenient and uniform.

[0013] Optionally, the push rod is provided with an elastic element for driving the push plate to move toward the centering frame.

[0014] By adopting the above technical solution, the pusher can be reset to a position close to the centering frame under the action of the elastic element, making it convenient to use. At the same time, the thrust provided by the elastic element to the pusher increases the resistance of the push rod, making the soil sample advancement process more uniform.

[0015] Optionally, the elastic element includes a spring fitted on the push rod, one end of which abuts against the centering frame and the other end against the top cap.

[0016] Optionally, the end of the centering support leg away from the centering plate is provided with a rounded corner.

[0017] By adopting the above technical solution, a rounded corner is provided at the end of the centering support leg away from the centering plate, which can prevent the centering support leg from being scratched or damaged when it comes into contact with the shear box, thus protecting the test equipment.

[0018] Optionally, one end of the push rod is rotatably connected to a rotating bearing seat, which is fixed to the middle of the push plate by bolts.

[0019] Optionally, one end of the centering plate is provided with a groove for the pusher plate to be received.

[0020] By adopting the above technical solution, it is convenient to store and carry the push plate, while protecting the push plate from damage when it is not in use.

[0021] In summary, this application includes at least one of the following beneficial effects:

[0022] 1. By combining the frame, push rod, and push plate in the design, and by cooperating the curved groove on the push rod with the guide column on the centering frame, the push rod is smoothly guided during the sliding process.

[0023] 2. By applying a gentle and stable resistance to the soil sample through a spring, the speed reached by the soil sample at the moment of being pushed away is greatly reduced, thereby significantly reducing the risk of soil sample structural damage that may be caused by high-speed pushing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the direct shear testing machine of this application;

[0025] Figure 2 This is a schematic diagram illustrating the cooperation structure between the propulsion device and the direct shear testing machine as described in this application;

[0026] Figure 3 This is a schematic diagram of the propulsion device of this application;

[0027] Figure 4 This is a cross-sectional schematic diagram of the propulsion device of this application;

[0028] Figure 5 This is a schematic diagram illustrating the structure of the push plate in this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Centering frame; 11. Centering plate; 111. Through hole; 112. Groove; 113. Guide post; 114. Long screw; 12. Centering support leg;

[0031] 2. Push rod; 21. Curved groove; 22. Rotary bearing housing; 23. Top cap; 24. Elastic element;

[0032] 3. Pushing the plate;

[0033] 4. Ring cutter;

[0034] 5. Direct shear testing machine;

[0035] 6. Clipboard. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the accompanying drawings.

[0037] This application discloses a soil sample propulsion device for a direct shear apparatus. (Refer to...) Figure 1 , 2 3. The propulsion device includes a centering frame 1, a push rod 2, and a push plate 3. The push plate 3 is rotatably connected to one end of the push rod 2, and the push rod 2 is slidably connected to the centering frame 1. The centering frame 1 is mounted on the ring cutter 4 so that the push plate 3 is coaxial with the ring cutter 4. Under the action of the push rod 2, it can move along the axial direction of the ring cutter 4, thereby pushing the soil sample in the ring cutter 4 into the shear box 6 of the direct shear test machine 5.

[0038] Reference Figure 3 , 4The centering frame 1 includes a centering plate 11 and centering legs 12. A through hole 111 is provided at the axis of the centering plate 11. A push rod 2, cylindrical in shape, is slidably connected in the through hole 111 and can slide up and down along the axis of the through hole 111. Multiple centering legs 12 are provided, evenly distributed around the axis of the centering plate 11 to enhance the stability of the centering frame 1. The end of the centering leg 12 away from the centering plate 11 has a rounded corner, and the side of the centering leg 12 that contacts the ring cutter 4 has an arc-shaped surface matching the outer circumferential surface of the ring cutter 4. In this embodiment, the number of centering legs 12 is selected according to the actual situation and can be two, three, or more; this embodiment does not limit the number of centering legs 12.

[0039] Reference Figure 3 , 4 The push rod 2 has a curved groove 21 extending circumferentially along its axis on its outer periphery. A guide post 113, adapted to the curved groove 21, is fixed on the wall of the through hole 111. The guide post 113 is located in the curved groove 21. The guide post 113 can be fitted with the curved groove 21 by means of a long screw 114. That is, a threaded hole communicating with the through hole 111 is opened on the outer periphery of the centering plate 11 along a direction perpendicular to the axis of the centering plate 11. The guide post 113 is fixed to one end of the long screw 114. As the long screw 114 engages with the threaded hole, it extends sequentially into the through hole 111 and the curved groove 21. During the upward and downward sliding process of the push rod 2, the cooperation between the curved groove 21 and the guide post 113 causes the push rod 2 to rotate, achieving stable guidance of the push rod 2 during the sliding process.

[0040] Reference Figure 5 One end of the push rod 2 is equipped with a rotating bearing seat 22, which is fixed to the middle of the push plate 3 by bolts, so that the push plate 3 will not rotate with the push rod 2 during the pushing process. The center plate 11 also has a groove 112 for the push plate 3 to be received on the side facing the ring cutter 4, so that the push plate 3 can be completely received into the groove 112.

[0041] When the guide post 113 reaches the uppermost end of the curved groove 21, the pusher 3 is flush with the lower end of the ring cutter 4. At this time, the soil sample in the ring cutter 4 has completely detached from the ring cutter 4 and fallen into the shear box 6 below. When the guide post 113 reaches the lowermost end of the curved groove 21, the pusher 3 is fully retracted into the groove 112 of the centering plate 11.

[0042] Reference Figure 3 , 4A cap 23 is fixed to the end of the push rod 2 away from the push plate 3 to facilitate the operator's application of force. In addition, the push rod 2 is equipped with an elastic element 24 for driving the push plate 3 toward the centering plate 11. Specifically, the elastic element 24 includes a spring fitted onto the push rod 2, with one end abutting against the centering plate 11 and the other end abutting against the cap 23. This automatically drives the push plate 3 toward the centering frame 1, achieving the reset of the push plate 3 and reducing the operator's workload.

[0043] During the dynamic process of push rod 2 rotating and gradually pressing down, the spring system is continuously subjected to compressive force from push rod 2. This continuous compression causes a large amount of elastic potential energy to accumulate inside the spring, which in turn generates an elastic feedback force at the other end of the spring, i.e., the part in contact with the top cap 23, that is, opposite to the direction of movement of push rod 2. This effectively slows down and hinders the process of the soil sample being rapidly and violently pushed out. At the same time, by applying a gentle and stable resistance to the soil sample, it significantly reduces the velocity reached by the soil sample at the moment of being pushed away, thereby significantly reducing the risk of soil sample structural damage that may be caused by high-speed pushing.

[0044] The implementation principle of the soil sample propulsion device of the direct shear apparatus in this application embodiment is as follows:

[0045] First, align the centering plate 11 with the upper end of the ring cutter 4, and place the centering support leg 12 against the outer periphery of the ring cutter 4; then, the user presses down the top cap 23, the push rod 2 rotates and gradually moves downward, and through the rotation and the resistance of the spring, the soil sample is slowly pushed out of the ring cutter 4.

[0046] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A soil sample propulsion device for a direct shear apparatus, characterized in that: The device includes a centering frame (1), a push rod (2), and a push plate (3). The push plate (3) is rotatably connected to one end of the push rod (2). The centering frame (1) has a through hole (111) in the middle for sliding connection of the push rod (2). The outer periphery of the push rod (2) has a curved groove (21) extending along the axial direction of the push rod (2). A guide post (113) adapted to the curved groove (21) is fixed on the hole wall of the through hole (111). The push rod (2) is slidably connected to the through hole (111), and the guide post (113) is located in the curved groove (21). The centering frame (1) is mounted on a ring cutter (4) so ​​that the push plate (3) is aligned with the soil sample inside the ring cutter (4).

2. The soil sample propulsion device for a direct shear apparatus according to claim 1, characterized in that: The centering frame (1) includes a centering plate (11) and centering legs (12). The through hole (111) of the centering frame (1) is located at the axis of the centering plate (11). There are multiple centering legs (12), and the multiple centering legs (12) are distributed at equal intervals around the axis of the centering plate (11).

3. The soil sample propulsion device for a direct shear apparatus according to claim 1, characterized in that: The push rod (2) has a top cap (23) fixed at the end away from the push plate (3).

4. The soil sample propulsion device for a direct shear apparatus according to claim 3, characterized in that: The push rod (2) is provided with an elastic element (24) for driving the push plate (3) to move toward the centering frame (1).

5. The soil sample propulsion device for a direct shear apparatus according to claim 4, characterized in that: The elastic element (24) includes a spring fitted on the push rod (2), one end of which abuts against the centering frame (1) and the other end of which abuts against the top cap (23).

6. The soil sample propulsion device for a direct shear apparatus according to claim 2, characterized in that: The centering support leg (12) has a rounded corner at the end away from the centering plate (11).

7. The soil sample propulsion device for a direct shear apparatus according to claim 1, characterized in that: One end of the push rod (2) is rotatably connected to a rotating bearing seat (22), which is fixed to the middle of the push plate (3) by bolts.

8. The soil sample propulsion device for a direct shear apparatus according to claim 2, characterized in that: One end of the center plate (11) is provided with a groove (112) for the push plate (3) to be received.

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