Soil pressure sensing device for frozen soil environment

Abstract

The utility model belongs to the field of pressure sensing devices in a frozen soil environment, and discloses a soil pressure sensing device for the frozen soil environment, which comprises a base, a supporting assembly and a cushion layer, a shell is slidably arranged on the upper end face of the base, a strain gauge is fixed to the upper end face of the base, a filter plate is fixed to the inner side of the shell, a supporting frame is fixed between the filter plate and the strain gauge, and a supporting assembly is fixed to the upper end of the filter plate. The supporting assembly comprises an annular base, the upper end of the annular base is in sealing sliding fit with an outer lifting frame, an inner lifting seat penetrating through the filter plate is arranged in the middle of the inner side of the filter plate, a protection barrier can be formed between the frozen soil block and the strain gauge through a cushion layer, and therefore the strain gauge can be prevented from deforming; and when the cushion layer is detached, on the premise that the hands of a worker do not make contact with the frozen soil block, the pressure of the frozen soil block on the cushion layer is reduced firstly, then the cushion layer is taken out, and the integrity of the frozen soil block can be kept easily.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the field of pressure sensing devices in frozen soil environment, and particularly relates to a soil pressure sensing device for frozen soil environment. BACKGROUND

[0002] In the case of measuring the pressure of frozen soil by the internal strain gauge type soil pressure sensing device, when the ambient temperature around the frozen soil first rises and then falls, the frozen soil directly contacts the strain gauge on the pressure sensor, and when the temperature rises, the ice in the frozen soil liquefies into liquid and drips onto the upper end surface of the strain gauge. At this time, the pressure sensor detects the compression of the liquid and the frozen soil together, so that the liquid and the frozen soil are difficult to separate, thereby making it inconvenient to record the change of the single frozen soil, and when the temperature falls again, the liquid at the connection position between the strain gauge and the frozen soil freezes again, which is easy to cause "frost heaving force" between them, and in severe cases, it is easy to cause the strain gauge to deform. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies of the prior art, the purpose of the present disclosure is to provide a soil pressure sensing device for frozen soil environment, which solves the problem of deformation of the strain gauge caused by the freezing of the liquid between the frozen soil and the strain gauge in the prior art.

[0004] The purpose of the present disclosure can be achieved by the following technical solutions:

[0005] The soil pressure sensing device for frozen soil environment comprises a base, a support assembly and a cushion layer.

[0006] The upper end surface of the base is slidably provided with a shell, and the upper end surface of the base is fixed with a strain gauge, the inner side of the shell is fixed with a filter plate, the filter plate and the strain gauge are fixed with a support frame, and the upper end of the filter plate is fixed with a support assembly.

[0007] The support assembly comprises an annular base, an outer lifting frame, an inner lifting seat and an inner support column, the upper end of the annular base is sealingly and slidably fitted with the outer lifting frame, the inner side of the filter plate is provided with the inner lifting seat penetrating the filter plate, the upper end of the inner lifting seat is sealingly and slidably fitted with the inner support column, the inner support column and the outer lifting frame are provided with a liquid delivery pipe, the annular base and the inner lifting seat constitute a communication structure through the liquid delivery pipe, the inner side of the liquid delivery pipe is rotatably provided with a one-way valve, and the outer side of the one-way valve is fixed with an adjusting assembly.

[0008] The upper end surface of the inner support column is placed with a cushion layer, and the upper end of the outer lifting frame is provided with an arc-shaped frame.

[0009] In some disclosures, the inner side of the base is provided with a limiting groove, the outer surface of the shell is attached to the inner surface of the limiting groove, and the movement path of the shell is the same as the path of the limiting groove.

[0010] In some of the disclosure, the shape of the arc-shaped frame is semicircular, and the radius of the arc-shaped frame is greater than the radius of the cushion layer.

[0011] In some of the disclosure, the cushion layer comprises a cardboard and a cotton layer, and the inner side of the cotton layer wraps the cardboard, and the cotton layer is attached to the inner support column and the lower surface of the frozen soil block, respectively.

[0012] In some of the disclosure, the inner side of the infusion tube is provided with an annular groove, and a rotating seat is rotatably arranged in the annular groove, and a one-way valve is fixed to the inner side of the rotating seat.

[0013] In some of the disclosure, the rotating seat sidewall is provided with a through hole penetrating through the rotating seat, and the position of the through hole is matched with the position of the one-way valve.

[0014] In some of the disclosure, the one-way valve comprises a fixed seat, a spring and a plug head, the inner side of the rotating seat is fixed with the fixed seat, the inner side of the fixed seat is slidably provided with the plug head, and the spring is fixed between the plug head and the fixed seat.

[0015] In some of the disclosure, the adjusting assembly comprises an adjusting rod and a transmission belt, the lower end surface of the rotating seat is fixed with a cylindrical protrusion, the outer wall of the base is fixed with the adjusting rod at the upper end, and the transmission belt is arranged between the adjusting rod and the cylindrical protrusion.

[0016] The nouns, conjunctions or adjectives involved in the above technical solutions are explained as follows:

[0017] Fixed connection refers to the connection of parts or components after being fixed without any relative movement;

[0018] Rotary connection refers to the connection between parts that allows the parts to rotate relative to each other;

[0019] Screw connection is a kind of detachable fixed connection, which has the advantages of simple structure, reliable connection and convenient assembly and disassembly, and is widely used in mechanical engineering and connection structure field;

[0020] Sliding connection refers to the connection between parts that allows the parts to slide relative to each other.

[0021] The beneficial effects of the present disclosure are:

[0022] The cushion layer can form a protective barrier between the frozen soil block and the strain gauge, thereby preventing the strain gauge from deforming. When the cushion layer is removed, the worker's hands do not come into contact with the frozen soil block, the pressure of the frozen soil block on the cushion layer is first reduced, and then the cushion layer is taken out, which is beneficial to maintain the integrity of the frozen soil block. At the same time, since the hands do not come into direct contact with the frozen soil layer during the removal of the cushion layer, the temperature of the outer surface of the frozen soil layer can be changed as little as possible, and the accuracy of the experimental data can be maintained. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without any creative effort.

[0024] Figure 1 is a schematic diagram of an explosion structure of the embodiment of the present disclosure;

[0025] Figure 2 is a schematic diagram of the overall structure of the embodiment of the present disclosure;

[0026] Figure 3 is a schematic diagram of the internal overall structure of the embodiment of the present disclosure;

[0027] Figure 4 is a schematic diagram of the overall structure without a substrate of the embodiment of the present disclosure;

[0028] Figure 5 is a schematic diagram of the internal overall structure of the embodiment of the present disclosure; Figure 4

[0029] Figure 6 is a schematic diagram of the overall structure of the one-way valve and the rotating seat of the embodiment of the present disclosure.

[0030] In the figure: 1, base; 101, limiting groove; 2, outer shell; 3, filter plate; 4, strain gauge; 41, support frame; 5, support assembly; 51, annular base; 52, outer lifting frame; 53, inner lifting seat; 54, inner support column; 521, arc-shaped frame; 6, cushion layer; 61, hardboard; 62, cotton layer; 7, infusion tube; 71, annular groove; 72, one-way valve; 73, rotating seat; 721, fixed seat; 722, spring; 723, plug head; 731, through hole; 732, columnar protrusion; 8, adjusting assembly; 81, adjusting rod; 82, transmission belt. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the scope of protection of the present disclosure.

[0032] According to the conception of the present application, the following will be described in combination with Figures 1 to 6 ​To describe the embodiment of the soil pressure sensing device for frozen soil environment. Specifically, the soil pressure sensing device for frozen soil environment is a split structure, which has three components: base 1, support assembly 5 and cushion 6. By the cushion, a protective barrier can be formed between the frozen soil block and the strain gauge, so that the strain gauge can be prevented from deforming, and when the cushion is disassembled, the worker's hands are not in contact with the frozen soil block, and then the cushion is taken out, which is beneficial to keep the integrity of the frozen soil block, and at the same time, the temperature of the outer surface of the frozen soil layer is changed as little as possible during the removal of the cushion, so as to keep the accuracy of the experimental data.

[0033] Please refer to Figures 1 to 6 The soil pressure sensing device for frozen soil environment comprises a base 1, a support assembly 5 and a cushion 6.

[0034] The upper end surface of the base 1 is slidably provided with a shell 2, and the upper end surface of the base 1 is fixed with a strain gauge 4, the inner side of the shell 2 is fixed with a filter plate 3, the filter plate 3 and the strain gauge 4 are fixed with a support frame 41, and the upper end of the filter plate 3 is fixed with a support assembly 5.

[0035] The support assembly 5 comprises an annular base 51, an outer lifting frame 52, an inner lifting seat 53 and an inner support column 54, and the upper end of the annular base 51 is sealingly and slidably fitted with the outer lifting frame 52, the inner side of the filter plate 3 is provided with the inner lifting seat 53 penetrating the filter plate 3, and the upper end of the inner lifting seat 53 is sealingly and slidably fitted with the inner support column 54, the inner support column 54 and the outer lifting frame 52 are provided with a liquid delivery pipe 7, the annular base 51 and the inner lifting seat 53 constitute a communication structure through the liquid delivery pipe 7, the inner side of the liquid delivery pipe 7 is rotatably provided with a one-way valve 72, and the outer side of the one-way valve 72 is fixed with an adjusting assembly 8.

[0036] The upper end surface of the inner support column 54 is placed with the cushion 6, and the upper end of the outer lifting frame 52 is provided with an arc-shaped frame 521.

[0037] Before use, the cushion 6 is placed on the upper end of the inner support column 54, and the weight of the cushion 6 is measured in advance. During use, the direction of the one-way valve 72 in the infusion tube 7 is adjusted so that the damping liquid in the annular base 51 can flow into the inner lifting seat 53. The user can press the outer lifting frame 52 from top to bottom, so that the damping liquid flows from the infusion tube 7 into the inner lifting seat 53. The damping liquid pushes the inner support column 54 to move upward until the inner support column 54 moves to the uppermost end of the inner lifting seat 53. At this time, the height of the inner support column 54 is higher than that of the arc-shaped frame 521. Then, the direction of the one-way valve 72 is changed by adjusting the adjusting assembly 8 so that the inner support column 54 is fixed at this position. The cushion 6 is placed on the upper end surface of the inner support column 54. During the experiment, the frozen soil block used for the experiment is placed on the upper end surface of the cushion 6. Since the lower end of the inner support column 54 is supported by the damping liquid at this time, when the inner support column 54 is subjected to the downward pressure of the frozen soil, the displacement of the inner support column 54 moving downward is relatively small, so that the height of the cushion 6 is still above the arc-shaped frame 521. The frozen soil block successively extrudes the cushion 6, the filter plate 3, the support frame 41 and the strain gauge 4 from top to bottom, so that the strain gauge 4 generates strain and converts it into resistance change. These changes are detected and measured by a bridge circuit and an amplification circuit, and finally an electric signal proportional to the pressure is output, so as to detect the weight change of the frozen soil block at this time. If it is necessary to detect the weight change of the frozen soil block when the ambient temperature changes, the ambient temperature outside the frozen soil block is first controlled to rise. At this time, part of the ice in the frozen soil block melts into liquid and flows downward to the upper end of the cushion 6 and is quickly absorbed by the cushion 6. Then, before the ambient temperature outside the frozen soil block is lowered, the direction of the one-way valve 72 is changed by adjusting the adjusting assembly 8. The cushion 6 is extruded by the frozen soil, which drives the cushion 6 and the inner support column 54 to slide downward, so as to force the damping liquid in the inner lifting seat 53 to flow into the annular base 51 along the infusion tube 7 and drive the outer lifting frame 52 to move upward until the inner support column 54 and the arc-shaped frame 521 are at the same height. At this time, the inner support column 54 and the arc-shaped frame 521 simultaneously provide upward support for the frozen soil block, thereby reducing the pressure of the frozen soil block on the cushion 6. At this time, the user can hold the outer lifting frame 52 to move upward, so that the position of the outer lifting frame 52 is higher than that of the cushion 6. At this time, the height of the cushion 6 is equal to that of the arc-shaped frame 521, thereby facilitating the user to separate the cushion 6 from the side without the arc-shaped frame 521. Since the tightness of the frozen soil block is reduced after part of the ice in the frozen soil block melts, this separation method is beneficial to maintaining the integrity of the frozen soil block. At the same time, since the hand does not directly contact the frozen soil block during the removal of the cushion 6, the temperature change of the outer surface of the frozen soil layer is minimized, thereby maintaining the accuracy of the experimental data. At the same time, the cushion 6 blocks the liquid between the strain gauge 4 and the frozen soil, and the liquid is collected and removed in advance, so that the "frost heaving force" phenomenon between the strain gauge 4 and the frozen soil is reduced after the temperature decreases again, thereby protecting the strain gauge 4. Since the liquid has flowed out, the change of the weight of the single frozen soil can be calculated after the cushion 6 is removed.If the change of the gravity of the frozen soil block needs to be calculated when the liquid is frozen again into ice blocks and adsorbed on the frozen soil block, the pad 6 can be removed, and the weight of the body of the pad 6 can be taken out during the calculation.

[0038] The inner side of the base 1 is provided with a limiting groove 101, and the outer surface of the shell 2 is attached to the inner surface of the limiting groove 101, and the movement path of the shell 2 is the same as the path of the limiting groove 101.

[0039] In use, the shell 2 is coaxially fixedly connected with the filter plate 3, and when the frozen soil block presses the filter plate 3 downward, the shell 2 can be driven to slide downward along the fixed limiting groove 101, and the lower end surface of the shell 2 is not attached to the upper end surface of the base 1, so that the shell 2 and the frozen soil block can act on the strain gauge 4, reducing the error caused by the fact that the upward supporting force provided by the base 1 to the shell 2 cannot be transmitted to the strain gauge 4.

[0040] The arc-shaped frame 521 is semicircular in shape, and the radius of the arc-shaped frame 521 is greater than the radius of the pad 6. The pad 6 is conveniently taken out from the arc-shaped frame 521, and after the arc-shaped frame 521 is higher than the pad 6, if the arc-shaped frame 521 wraps the pad 6 in a whole circle, it is not easy to take out the pad 6. By raising the outer lifting frame 52, it is also convenient to take out and separate the pad 6.

[0041] The pad 6 comprises a hardboard 61 and a cotton layer 62, and the inner side of the cotton layer 62 wraps the hardboard 61, and the cotton layer 62 is attached to the lower surface of the frozen soil block and the inner support column 54, respectively.

[0042] The cotton layer 62 absorbs and stores the melted liquid, and the hardboard 61 arranged in the middle of the cotton layer 62 improves the supporting property of the pad 6, so that when the gravity of the frozen soil block is distributed on the pad 6 and the arc-shaped frame 521, the pad 6 is deformed under pressure and is not easy to be taken out from the arc-shaped frame 521.

[0043] The inner side of the infusion tube 7 is provided with an annular groove 71, and a rotating seat 73 is rotatably arranged in the annular groove 71, and a one-way valve 72 is fixed to the inner side of the rotating seat 73.

[0044] The one-way valve 72 is fixed to the rotating seat 73, and the direction of the one-way valve 72 is adjusted through the rotating seat 73. Since the rotating seat 73 and the annular groove 71 are both cylindrical, the contact area between the rotating seat 73 and the annular groove 71 does not change before and after rotation, which is conducive to good air tightness between the side wall of the rotating seat 73 and the inner wall of the annular groove 71 after the one-way valve 72 is rotated, thereby facilitating use.

[0045] The side wall of the rotating seat 73 is provided with a through hole 731 penetrating through the rotating seat 73, and the position of the through hole 731 is matched with the position of the one-way valve 72.

[0046] The one-way valve 72 comprises a fixed seat 721, a spring 722 and a plug head 723, the inner side of the rotating seat 73 is fixed with the fixed seat 721, and the inner side of the fixed seat 721 is slidably provided with the plug head 723, and the spring 722 is fixed between the plug head 723 and the fixed seat 721. The plug head 723 is coaxially arranged with the through hole 731, and the diameter of the plug head 723 is greater than the diameter of the through hole 731, so that when the spring 722 is in the original length state, the plug head 723 abuts against the through hole 731, at this time the plug head 723 and the through hole 731 are in sealing cooperation, so as to limit the damping liquid on the side of the rotating seat 73 away from the plug head 723 to pass through the through hole 731 blocked by the plug head 723, and when the damping liquid pushes the plug head 723 to compress the spring 722, the gap between the plug head 723 and the through hole 731 will increase, so as to facilitate the damping liquid to pass through the one-way valve 72, and realize the one-way flow of the damping liquid in the infusion tube 7, thereby limiting the position of the inner supporting column 54 and the outer lifting frame 52.

[0047] The adjusting assembly 8 comprises an adjusting rod 81 and a transmission belt 82, the lower end surface of the rotating seat 73 is fixed with a columnar protrusion 732, the outer wall of the base 1 is fixed with the adjusting rod 81 at the upper end, and the transmission belt 82 is arranged between the adjusting rod 81 and the columnar protrusion 732.

[0048] In use, when the direction of the one-way valve 72 needs to be adjusted, the adjusting rod 81 is rotated to drive the columnar protrusion 732 to rotate through the transmission belt 82, so as to drive the rotating seat 73 to rotate, thereby changing the direction of the one-way valve 72, so as to facilitate changing the orientation of the one-way valve 72 in the rotating seat 73 from the outside of the shell 2, thereby facilitating use.

[0049] The soil pressure sensing device for frozen soil environment provided by the present application will be further described below in combination with the drawings and embodiments.

[0050] Before use, the cushion 6 is placed on the upper end of the inner support column 54, and the weight of the cushion 6 is measured in advance. During the experiment, the frozen soil block is placed on the upper end of the cushion 6. When the temperature outside the frozen soil block rises, part of the ice on the frozen soil block melts into liquid and flows downward to the upper end of the cushion 6 and is quickly absorbed by the cushion 6. Before the ambient temperature outside the frozen soil block is adjusted to decrease, the adjusting rod 81 is rotated, and then the cylindrical protrusion 732 is rotated through the transmission belt 82, thereby rotating the rotating seat 73 and changing the direction of the one-way valve 72, so that the damping liquid in the annular base 51 can flow into the inner lifting seat 53. The cushion 6 is pressed by the frozen soil, which drives the cushion 6 and the inner support column 54 to slide downward, thereby forcing the damping liquid in the inner lifting seat 53 to enter the annular base 51 through the liquid delivery pipe 7, and driving the outer lifting frame 52 to move upward until the inner support column 54 and the arc-shaped frame 521 are at the same height. At this time, the inner support column 54 and the arc-shaped frame 521 simultaneously provide upward support to the frozen soil block, thereby reducing the pressure of the frozen soil block on the cushion 6. At this time, the cushion is taken out of the arc-shaped frame 521, and the frozen soil block successively presses the cushion 6, the filter plate 3, the support frame 41 and the strain gauge 4 from top to bottom, so that the strain gauge 4 generates strain and converts into resistance change, and the changes are detected and measured through the bridge circuit and the amplification circuit, and finally an electric signal proportional to the pressure is output, thereby detecting the weight change of the frozen soil block at this time.

[0051] In the description of the present specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The basic principles, main features and advantages of the present disclosure are shown and described above. It should be understood by those skilled in the art that the present disclosure is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, various changes and improvements can be made to the present disclosure, and these changes and improvements all fall within the scope of the claimed present disclosure.

Claims

1. A soil pressure sensing device for use in a frozen ground environment, characterised in that, Include: Base (1), support assembly (5) and cushion (6); The upper end surface of the base (1) is slidably provided with a shell (2), and the upper end surface of the base (1) is fixed with a strain gage (4), the inner side of the shell (2) is fixed with a filter plate (3), the filter plate (3) and the strain gage (4) are fixed with a support frame (41), and the upper end of the filter plate (3) is fixed with a support assembly (5); The support assembly (5) comprises an annular base (51), an outer lifting frame (52), an inner lifting seat (53) and an inner support column (54), and the upper end of the annular base (51) is sealingly and slidably fitted with the outer lifting frame (52), the inner side of the filter plate (3) is provided with the inner lifting seat (53) penetrating the filter plate (3), and the upper end of the inner lifting seat (53) is sealingly and slidably fitted with the inner support column (54), the inner support column (54) and the outer lifting frame (52) are provided with the infusion tube (7), and the annular base (51) and the inner lifting seat (53) constitute a communication structure through the infusion tube (7), and the inner side of the infusion tube (7) is rotatably provided with a one-way valve (72), and the outer side of the one-way valve (72) is fixed with an adjusting assembly (8); The upper end surface of the inner support column (54) is placed with the cushion (6), and the upper end of the outer lifting frame (52) is provided with an arc-shaped frame (521).

2. The earth pressure sensing device for frozen ground environments of claim 1, wherein, The inner side of the base (1) is provided with a limiting groove (101), and the outer surface of the shell (2) is attached to the inner surface of the limiting groove (101), and the movement path of the shell (2) is the same as the path of the limiting groove (101).

3. The earth pressure sensing device for frozen ground environments of claim 1, wherein, The shape of the arc-shaped frame (521) is semicircular, and the radius of the arc-shaped frame (521) is greater than the radius of the cushion (6).

4. The earth pressure sensing device for frozen ground environments of claim 3, wherein, The cushion (6) comprises a hardboard (61) and a cotton layer (62), and the inner side of the cotton layer (62) is wrapped around the hardboard (61), and the cotton layer (62) is attached to the lower surface of the frozen soil block and the inner support column (54) respectively.

5. The earth pressure sensing device for frozen ground environments of claim 1, wherein, The inner side of the infusion tube (7) is provided with an annular groove (71), and the annular groove (71) is rotatably provided with a rotating seat (73), and the inner side of the rotating seat (73) is fixed with a one-way valve (72).

6. The earth pressure sensing device for frozen ground environments of claim 5, wherein, The side wall of the rotating seat (73) is provided with a through hole (731) penetrating the rotating seat (73), and the position of the through hole (731) is adapted to the position of the one-way valve (72).

7. The earth pressure sensing device for frozen ground environments of claim 6, wherein, The one-way valve (72) comprises a fixed seat (721), a spring (722) and a plug head (723), the inner side of the rotating seat (73) is fixed with the fixed seat (721), the inner side of the fixed seat (721) is slidably provided with the plug head (723), and the plug head (723) and the fixed seat (721) are fixed with the spring (722).

8. The earth pressure sensing device for frozen ground environments of claim 6, wherein, The adjusting assembly (8) comprises an adjusting rod (81) and a transmission belt (82), the lower end surface of the rotating seat (73) is fixed with a columnar protrusion (732), the outer wall of the base (1) is fixed with an adjusting rod (81) at the upper end, and the adjusting rod (81) and the columnar protrusion (732) are provided with a transmission belt (82).

Images