Soil liquid-plastic limit combined determination device for engineering investigation

Abstract

The utility model discloses a soil liquid-plastic limit combined measuring device for engineering investigation, which comprises a testing host and a guide cylinder fixedly mounted right above a lifting seat on the testing host, an electromagnet is fixedly mounted in the guide cylinder, and a connecting rod is vertically and movably inserted in the guide cylinder. The upper end of the connecting rod is rotationally connected with a limiting seat capable of being attracted to the bottom of the electromagnet, the lower end of the connecting rod is provided with a cone, and the upper end of the cone is fixedly connected with a connecting rod. The connecting rod is of a split structure, the connecting rod can rotate independently, the diameter of the upper end of the connecting rod is smaller than that of the lower end of the connecting rod, screw hole alignment is very convenient, and when the cone is disassembled and assembled, the cone is held immovably, the connecting rod is twisted, and the operation is very convenient; threads are arranged on the surface of the connecting rod at a certain distance and used for being connected with the mating rod and the connecting rod, so that the number of turns of twisting the connecting rod is greatly reduced, operation is greatly simplified, and great convenience is brought to a soil liquid-plastic limit combined determination experiment.

Description

Technical Field

[0001] This utility model relates to the field of soil testing technology, specifically to a combined soil liquid and plastic limit testing device for engineering surveys. Background Technology

[0002] The soil liquid limit and plastic limit combined tester is an automatic timing, measurement and display instrument used to determine the liquid limit and plastic limit of soil. It provides a reliable basis for classifying soil types, calculating natural consistency and plasticity index, and is an indispensable experimental instrument for engineering survey.

[0003] The soil liquid and plastic limit analyzer comes pre-loaded with a total of 100 grams, including a connecting rod, a cone, and a counterweight. The counterweight weighs 24 grams, and the connecting rod and cone together weigh 76 grams. Both weights are used to determine the soil's liquid and plastic limits. When using the 76-gram instrument, the cone needs to be disassembled and the counterweight removed. Extreme care must be taken when using the cone, especially when disassembling and assembling the counterweight. The cone should be held by hand and slowly rotated to avoid damaging the tip. Damaging the cone renders it unusable, and even if it is used, the experimental results will be meaningless.

[0004] Currently available soil liquid and plastic limit analyzers require the connecting rod to be twisted to separate from the main rod during the disassembly and assembly of the weight and cone. To protect the cone tip, the main rod needs to be moved to a limit position to ensure sufficient space for operation below. However, because the existing connecting rod is a single unit, it cannot rotate when fixed at the limit position, relying entirely on the cone for rotation. Since the screw hole at the bottom of the connecting rod is vertical, and the diameter of the connecting rod connected to the screw hole on the cone is perfectly matched, it is difficult to align and twist. Furthermore, the cone's small size, smooth surface, and uneven shape make it difficult to handle, further complicating the twisting process and causing significant inconvenience to experiments. These shortcomings exist. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a combined soil liquid and plastic limit determination device for engineering surveys, which solves the problem that the inconvenience caused by the inconvenience of disassembling and assembling existing soil liquid and plastic limit determination instruments.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A combined soil liquid and plastic limit determination device for engineering survey includes a test host and a guide cylinder fixedly installed above the lifting seat on the test host. An electromagnet is fixedly installed inside the guide cylinder, and a connecting rod is vertically and movably inserted inside the guide cylinder. The upper end of the connecting rod is rotatably connected to a limiting seat that can be attracted to the bottom of the electromagnet, and a cone is installed at the lower end of the connecting rod.

[0008] The upper end of the cone is fixedly connected to a connecting rod, which includes a guide rod located above and a fixed rod located below. The diameter of the guide rod is smaller than that of the fixed rod, and a guide frustum with a gradually changing diameter is provided between the guide rod and the fixed rod.

[0009] The upper half of the fixed rod is threaded, the lower end of the connecting rod is threaded, the cone is installed below the connecting rod through the thread and the threaded hole, the lower end of the connecting rod is also provided with anti-slip texture, and a detachable counterweight is also installed on the connecting rod through the thread.

[0010] Preferably, both the limiting seat and the connecting rod are vertical cylindrical, the diameter of the limiting seat is larger than the diameter of the connecting rod, and the guide cylinder is provided with a relief groove corresponding to the limiting seat.

[0011] Preferably, the inner walls of the guide cylinder and the relief groove are provided with an active gap of not less than one millimeter between them and the surfaces of the connecting rod and the limiting seat.

[0012] Preferably, the upper end of the connecting rod is provided with a fixed shaft, and the connecting rod and the limiting seat are rotatably connected by the fixed shaft and a precision bearing embedded in the bottom of the limiting seat.

[0013] Preferably, the connecting rod and the fixed shaft are an integral structure, the connecting rod and the cone are an integral structure, and the limiting seat, precision bearing, fixed shaft, connecting rod, connecting rod, counterweight and cone are coaxially arranged.

[0014] Preferably, the fixing rod is movably installed with the counterweight via threads on the upper surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention features a split-structure connecting rod. When the limiting seat is fixed by an electromagnet, the connecting rod can rotate independently under the action of the limiting seat and precision bearing. Simultaneously, the upper diameter of the connecting rod at the top of the cone is smaller than the lower diameter, providing a guiding effect when aligning with the screw hole, which is very convenient. During disassembly and assembly of the cone, the cone is held still, and the connecting rod is simply turned, which is extremely convenient. Furthermore, the connecting rod surface has threads only for a short distance to connect with the seed stock and connecting rod, significantly reducing the number of turns required to rotate the connecting rod, greatly simplifying the operation and greatly facilitating soil liquid and plastic limit combined determination experiments. This solves the problem of inconvenient disassembly and assembly in existing soil liquid and plastic limit combined determination instruments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the guide cylinder of this utility model;

[0019] Figure 3 This is a cross-sectional view of the connecting rod of this utility model;

[0020] Figure 4 This is a cross-sectional view of the cone of this utility model;

[0021] Figure 5 This is a schematic diagram of the cone and connecting rod structure of this utility model.

[0022] In the diagram: 1. Test host; 2. Lifting seat; 3. Guide cylinder; 301. Clearance groove; 4. Electromagnet; 5. Connecting rod; 501. Screw hole; 502. Anti-slip texture; 503. Fixed shaft; 6. Limit seat; 601. Precision bearing; 7. Cone; 8. Connecting rod; 801. Guide rod; 802. Fixed rod; 803. Guide frustum; 804. Thread; 9. Counterweight. Detailed Implementation

[0023] 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.

[0024] like Figure 1-5 As shown, this utility model provides a technical solution: a soil liquid and plastic limit combined determination device for engineering survey, including a test host 1 and a guide cylinder 3 fixedly installed above the lifting seat 2 on the test host 1. An electromagnet 4 is fixedly installed inside the guide cylinder 3, and a connecting rod 5 is vertically and movably inserted inside the guide cylinder 3. The upper end of the connecting rod 5 is rotatably connected to a limiting seat 6 that can be attracted to the bottom of the electromagnet 4.

[0025] A fixed shaft 503 is provided at the upper end of the connecting rod 5. The connecting rod 5 and the limiting seat 6 are rotatably connected by the fixed shaft 503 and the precision bearing 601 embedded in the bottom of the limiting seat 6. Both the limiting seat 6 and the connecting rod 5 are vertical cylindrical. The diameter of the limiting seat 6 is larger than the diameter of the connecting rod 5. A relief groove 301 corresponding to the limiting seat 6 is provided in the guide cylinder 3. The inner wall of the guide cylinder 3 and the relief groove 301 are provided with an active gap of not less than one millimeter between them and the surfaces of the connecting rod 5 and the limiting seat 6.

[0026] A cone 7 is installed at the lower end of the connecting rod 5, and a connecting rod 8 is fixedly connected to the upper end of the cone 7. The connecting rod 8 includes a guide rod 801 located above and a fixed rod 802 located below. The diameter of the guide rod 801 is smaller than that of the fixed rod 802, and a guide frustum 803 with a gradually changing diameter is provided between the guide rod 801 and the fixed rod 802.

[0027] The upper half of the fixed rod 802 is provided with a thread 804, the lower end of the connecting rod 5 is provided with a screw hole 501, the cone 7 is installed below the connecting rod 5 through the thread 804 and the screw hole 501, the lower end of the connecting rod 5 is also provided with anti-slip texture 502, the connecting rod 8 is also provided with a detachable counterweight 9 through the thread 804, and the fixed rod 802 is movably installed with the counterweight 9 through the thread 804 on the upper half of the surface;

[0028] The connecting rod 5 and the fixed shaft 503 are integrated into one structure, the connecting rod 8 and the cone 7 are integrated into one structure, and the limit seat 6, the precision bearing 601, the fixed shaft 503, the connecting rod 5, the connecting rod 8, the counterweight 9 and the cone 7 are coaxially arranged.

[0029] Working principle:

[0030] By setting the connecting rod 5 as a split structure, when the limiting seat 6 is fixed by the electromagnet 4, the connecting rod 5 can rotate independently under the action of the limiting seat 6 and the precision bearing 601. At the same time, the upper diameter of the connecting rod 8 at the top of the cone 7 is smaller than the lower diameter, which has a guiding effect when aligning with the screw hole 501, which is very convenient. When disassembling and assembling the cone 7, the cone 7 is held still, and the connecting rod 5 is turned instead, which is very convenient. In addition, the surface of the connecting rod 8 is only provided with a thread 804 for connecting with the seed and the connecting rod 5, which greatly reduces the number of turns of the connecting rod 5, greatly simplifies the operation, and brings great convenience to the soil liquid and plastic limit joint determination experiment.

[0031] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil liquid-plastic limit combined determination device for engineering investigation, comprising a test host (1) and a guide cylinder (3) fixedly installed above a lifting seat (2) on the test host (1), characterized in that: The electromagnet (4) is fixedly installed in the guide cylinder (3), the connecting rod (5) is vertically movably inserted into the guide cylinder (3), the upper end of the connecting rod (5) is rotatably connected with the limiting seat (6) which can be adsorbed at the bottom of the electromagnet (4), and the lower end of the connecting rod (5) is provided with the conical body (7). The upper end of the conical body (7) is fixedly connected with the connecting rod (8), the connecting rod (8) comprises the guide rod (801) located at the upper portion and the fixed rod (802) located at the lower portion, the diameter of the guide rod (801) is smaller than that of the fixed rod (802), and the guide circular table (803) with gradually changed diameter is arranged between the guide rod (801) and the fixed rod (802). The upper half surface of the fixed rod (802) is provided with the thread (804), the lower end of the connecting rod (5) is provided with the screw hole (501), the conical body (7) is installed below the connecting rod (5) through the thread (804) and the screw hole (501), the lower end surface of the connecting rod (5) is further provided with the anti-skid line (502), and the connecting rod (8) is further provided with the detachable counterweight (9) through the thread (804).

2. The combined soil liquid-plastic limit determination device for engineering investigation according to claim 1, characterized in that: The limiting seat (6) and the connecting rod (5) are both vertically cylindrical, the diameter of the limiting seat (6) is larger than that of the connecting rod (5), and the guide cylinder (3) is provided with the accommodation groove (301) corresponding to the limiting seat (6).

3. The combined soil liquid-plastic limit determination device for engineering investigation according to claim 1, characterized in that: The inner walls of the guide cylinder (3) and the accommodation groove (301) and the surfaces of the connecting rod (5) and the limiting seat (6) are all provided with the movable gap which is not less than one millimeter.

4. The combined soil liquid-plastic limit determination device for engineering investigation according to claim 1, characterized in that: The upper end of the connecting rod (5) is provided with the fixed shaft (503), and the connecting rod (5) and the limiting seat (6) are rotatably connected through the fixed shaft (503) and the precision bearing (601) embeddedly installed at the bottom of the limiting seat (6).

5. The combined soil liquid-plastic limit determination device for engineering investigation according to claim 4, characterized in that: The connecting rod (5) and the fixed shaft (503) are an integral structure, the connecting rod (8) and the conical body (7) are an integral structure, and the limiting seat (6), the precision bearing (601), the fixed shaft (503), the connecting rod (5), the connecting rod (8), the counterweight (9) and the conical body (7) are coaxially arranged.

6. The combined soil liquid-plastic limit determination device for engineering investigation according to claim 1, characterized in that: The fixed rod (802) is movably installed with the counterweight (9) through the thread (804) on the upper half surface.

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