Device for detecting thickness of sludge in piezometric tube

Abstract

The utility model discloses a device for detecting the thickness of sludge in a piezometric tube, relates to the field of sensors, and adopts the technical scheme for solving the technical problem that the device for detecting the thickness of the sludge in the piezometric tube comprises an elastic piece, a supporting plate and a magnetostrictive displacement sensor, the lower end of the elastic piece is arranged at the bottom of the pressure measuring pipe, the supporting plate is arranged at the upper end of the elastic piece, sludge is accumulated on the supporting plate, the magnetostrictive displacement sensor is arranged on the upper portion of the pressure measuring pipe, and the magnetostrictive displacement sensor is located above the sludge. The moving end of the magnetostrictive displacement sensor is connected with the supporting plate through a connecting rod. Linear deformation is converted into relative displacement change between the magnetostriction displacement sensor measuring ring and the waveguide rod, high-precision measurement of the sludge thickness is finally achieved, and automatic measurement of the sludge thickness is achieved.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to a device for detecting the thickness of sludge in a pressure measuring tube. Background Art

[0002] After the reservoir is built and filled with water, seepage may occur in the dam body and dam foundation due to the water level difference between upstream and downstream. Seepage monitoring is of great significance to the safe and stable operation of the dam body and dam foundation. In order to realize the observation of the seepage pressure of the dam body, the multi-point observation method is generally adopted. Usually, a longitudinal section is selected along the axis of the dam and several cross sections are selected perpendicular to the axis of the dam to arrange the pressure measuring tubes to build a measurement environment for multi-point seepage pressure monitoring. A pore water pressure gauge is put into each pressure measuring tube, and the pore water pressure of each measuring point is measured through the matching measuring instrument or data acquisition device. On this basis, the dam body seepage pressure value is further calculated through the formula.

[0003] The piezometer is mainly composed of three parts: the conduit, the water inlet pipe, and the sedimentation pipe. The national standard stipulates that the inner diameter of the piezometer should not be greater than 50mm, so there are relatively strict restrictions on the spatial scale. During long-term use, since the water flow will inevitably carry sediment, the sediment will seep into the piezometer from the water inlet with the water flow. As time goes by, the sediment will gradually accumulate. When the sedimentation reaches a certain thickness, it will cause the sensor in the tube to fail, or even cause siltation in the tube. In addition, if the piezometer arranged in the field is not properly protected and mud falls into the tube, it will also form a local blockage. These situations will make the piezometer unable to be used normally and affect the observation effect.

[0004] At present, the detection of silt thickness in pressure measuring tubes is basically carried out by manual observation, such as manual measurement tools such as probe rods and graduated measuring ropes. Due to the limited size of the pipe diameter, the measurement technology of riverbed silt thickness measuring instruments in other fields cannot be transplanted. Therefore, to date, there is still a lack of effective automated measurement methods for the detection of silt thickness in pressure measuring tubes. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a device for detecting the sludge thickness in a pressure measuring tube. The utility model converts linear deformation into a relative displacement change between a measuring ring of a magnetostrictive displacement sensor and a waveguide rod, thereby finally achieving high-precision measurement of the sludge thickness and realizing automated measurement of the sludge thickness.

[0006] The utility model solves the technical problem by adopting a technical solution: a device for detecting the thickness of sludge in a pressure measuring tube, comprising an elastic member, a supporting plate and a magnetostrictive displacement sensor;

[0007] The lower end of the elastic member is arranged at the bottom of the pressure measuring tube, the upper end of the elastic member is provided with the support plate, the sludge is accumulated on the support plate, the upper part of the pressure measuring tube is provided with the magnetostrictive displacement sensor, the magnetostrictive displacement sensor is located above the sludge, and the movable end of the magnetostrictive displacement sensor is connected to the support plate through a connecting rod.

[0008] The sludge accumulates on the pallet, and the pallet is set on an elastic part. Under the gravity of the sludge, the elastic part is compressed downward, and the pallet is positioned downward. The displacement of the pallet is transmitted to the magnetostrictive displacement sensor through the connecting rod. The magnetostrictive displacement sensor can know the displacement of the pallet, and then combine the elastic coefficient of the elastic part and the density of the sludge to know the thickness of the sludge.

[0009] Preferably, the magnetostrictive displacement sensor comprises an electronic compartment, a waveguide rod and a measuring ring;

[0010] The electronic compartment is electrically connected to a data acquisition device, the electronic compartment is fixed to the upper end of the waveguide rod, and the measuring ring is slidably sleeved on the waveguide rod.

[0011] The displacement of the measuring ring on the waveguide rod can be easily known.

[0012] Preferably, the data acquisition device complies with the specification requirements of DLT 1134-2018 for automatic data acquisition device for dam safety monitoring, and obtains the value of silt thickness more accurately.

[0013] Preferably, the data acquisition device is provided with an RS485 serial bus interface.

[0014] Preferably, the connecting rod is made of stainless steel, which is more durable and corrosion-resistant.

[0015] Preferably, the diameter of the connecting rod is not greater than 5 mm. Reduce the influence of silt.

[0016] Preferably, the support plate is made of stainless steel, which is more durable and corrosion-resistant.

[0017] Preferably, the outer edge of the support plate is slidably fitted with the pressure measuring tube to ensure that the sludge can be accumulated on the support plate.

[0018] Preferably, the support plate and the elastic member are connected by riveting, screwing or welding, which is a more flexible connection method.

[0019] Preferably, the elastic member is a stainless steel bellows with a rated expansion and contraction amount of 1 m, so as to ensure that the measurement requirements of the sludge in this state can be met.

[0020] Beneficial effects of the utility model:

[0021] This solution uses an elastic part to connect with the support plate, and a magnetostrictive displacement sensor to detect the deformation of the elastic part. The linear deformation is converted into a relative displacement change between the magnetostrictive displacement sensor measuring ring and the waveguide rod, ultimately achieving high-precision measurement of sludge thickness. The detection is more convenient and efficient, and automated measurement of sludge thickness is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one of the drawings of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of an embodiment of the utility model;

[0024] Among them, 1. serial bus; 2. electronic warehouse; 3. data acquisition device; 4. waveguide rod; 5. measuring ring; 6. connecting rod; 7. sludge accumulation belt; 8. support plate; 9. elastic part. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0026] Example

[0027] like Figure 1 As shown, a device for detecting the thickness of sludge in a pressure measuring tube includes an elastic member 9, a support plate 8 and a magnetostrictive displacement sensor;

[0028] The lower end of the elastic member 9 is arranged at the bottom of the pressure measuring tube, the upper end of the elastic member 9 is provided with the support plate 8, the sludge is accumulated on the support plate 8, the upper part of the pressure measuring tube is provided with the magnetostrictive displacement sensor, the magnetostrictive displacement sensor is located above the sludge, and the movable end of the magnetostrictive displacement sensor is connected to the support plate 8 through a connecting rod 6.

[0029] The sludge accumulates on the support plate 8, and the support plate 8 is set on the elastic member 9. Under the gravity of the sludge, the elastic member 9 is compressed downward, and the support plate 8 is positioned downward. The displacement of the support plate 8 is transmitted to the magnetostrictive displacement sensor through the connecting rod 6. The magnetostrictive displacement sensor can know the displacement of the support plate 8, and then combine the elastic coefficient of the elastic member 9 and the density of the sludge to know the thickness of the sludge.

[0030] The working principle of the device is as follows:

[0031] (1) The silt accumulation acts on the support plate 8, generating a force F that is proportional to the thickness Δh.

[0032] (2) The support plate 8 is rigidly connected to the elastic member 9, and the force F is transmitted to the elastic member 9 through the support plate 8 without distortion, generating a displacement ΔX that is proportional to the force F.

[0033] (3) The elastic member 9 drives the support plate 8 to generate a displacement ΔX while generating deformation, and the connecting rod 6 attached to the support plate 8 moves the measuring ring 5, causing a relative movement of ΔX between it and the waveguide rod 4.

[0034] (4) The relative movement between the measuring ring 5 and the waveguide rod 4 is processed by the electronic compartment 2 of the magnetostrictive displacement sensor and outputs a measured value N_x corresponding to the value of ΔX.

[0035] (5) The measured value N_x of the magnetostrictive displacement sensor is uploaded to the data acquisition device 3 through the serial bus 1. The CPU in the data acquisition device 3 calculates the final measured value of the sludge thickness Δh from N_x through a calculation formula.

[0036] The data acquisition device 3 is provided with a local display module to display the measured value of the silt thickness Δh locally at the location of the device. In addition, it can also be equipped with a communication interface to transmit the measured value of the silt thickness Δh to the host computer of the remote measurement control center through a wired communication line or a wireless communication link, and the host computer performs measurement, display and data storage.

[0037] The magnetostrictive displacement sensor comprises an electronic compartment 2, a waveguide rod 4 and a measuring ring 5;

[0038] The electronic chamber 2 is electrically connected to the data acquisition device 3, the electronic chamber 2 is fixed to the upper end of the waveguide rod 4, and the measuring ring 5 is slidably sleeved on the waveguide rod 4. The magnetostrictive displacement sensor has a measuring range of 1 m.

[0039] The displacement of the measuring ring 5 on the waveguide rod 4 can be easily known.

[0040] The data acquisition device 3 complies with the specification requirements of DLT 1134-2018 for automatic data acquisition devices for dam safety monitoring. The value of silt thickness is obtained more accurately. The data acquisition device 3 is provided with an RS485 serial bus 1 interface. The data measurement and reading function of the magnetostrictive displacement sensor is realized through the serial bus 1.

[0041] The connecting rod 6 is made of stainless steel, which is more durable and corrosion-resistant.

[0042] The diameter of the connecting rod 6 is not greater than 5 mm to reduce the influence of silt. The diameter is as thin as possible while ensuring sufficient structural strength.

[0043] The support plate 8 is made of stainless steel, which is more durable and corrosion-resistant. The support plate 8 is a metal sheet disc with a thickness of 2 mm. The outer edge of the support plate 8 is slidably matched with the pressure measuring tube to ensure that the sludge can be accumulated on the support plate 8. The diameter of the support plate 8 adopts a negative tolerance of -0.5 (mm).

[0044] The support plate 8 is connected to the elastic member 9 by riveting, screwing or welding. The connection method is more flexible. The elastic member 9 is a stainless steel bellows with a rated expansion and contraction of 1m to ensure that the measurement requirements of the sludge in this state can be met.

[0045] Beneficial effects of the utility model:

[0046] The present invention aims at the practical engineering problem that the existing sensor technology is difficult to realize direct detection of silt thickness under the constraint of limited pipe diameter. The design concept of linear deformation from silt thickness to elastic structure is introduced, and the linear deformation is further converted into the relative displacement change between the measuring ring 5 and the waveguide rod 4, and finally the high-precision measurement of silt thickness is realized. It provides a feasible technical means for the automatic detection of silt thickness in the pressure measuring tube.

[0047] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several deformations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A device for detecting the thickness of sludge in a pressure measuring tube, characterized in that: It comprises an elastic member (9), a supporting plate (8) and a magnetostrictive displacement sensor; The lower end of the elastic member (9) is arranged at the bottom of the pressure measuring tube, the upper end of the elastic member (9) is provided with the support plate (8), the sludge is accumulated on the support plate (8), the upper part of the pressure measuring tube is provided with the magnetostrictive displacement sensor, the magnetostrictive displacement sensor is located above the sludge, and the movable end of the magnetostrictive displacement sensor is connected to the support plate (8) via a connecting rod (6).

2. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 1, characterized in that: The magnetostrictive displacement sensor comprises an electronic compartment (2), a waveguide rod (4) and a measuring ring (5); The electronic warehouse (2) is electrically connected to a data acquisition device (3), the electronic warehouse (2) is fixed to the upper end of the waveguide rod (4), and the measuring ring (5) is slidably sleeved on the waveguide rod (4).

3. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 2, characterized in that: The data acquisition device (3) complies with the specification requirements of DLT 1134-2018 for automatic data acquisition devices for dam safety monitoring.

4. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 2, characterized in that: The data acquisition device (3) is provided with an RS485 serial bus (1) interface.

5. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 1, characterized in that: The connecting rod (6) is made of stainless steel.

6. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 1, characterized in that: The diameter of the connecting rod (6) is no greater than 5 mm.

7. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 1, characterized in that: The support plate (8) is made of stainless steel.

8. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 1, characterized in that: The outer edge of the support plate (8) is slidably fitted with the pressure measuring tube.

9. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 1, characterized in that: The support plate (8) and the elastic member (9) are connected by riveting, screwing or welding.

10. The device for detecting the thickness of sludge in a pressure measuring tube according to claim 1, characterized in that: The elastic member (9) is a stainless steel bellows having a rated expansion and contraction amount of 1 m.

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