A kind of expansion joint deformation detection device and measurement method

Abstract

The present invention discloses a deformation detection device and a measuring method for an expansion joint. The deformation detection device includes a plurality of mounting clamps, a U-shaped clamp, a variable length unit, an on-site ruler, a displacement sensor and a circuit board waterproof box, wherein: the mounting clamp is connected with the expansion joint, the expansion joint includes a corrugated pipe and fixed supports arranged at both ends of the corrugated pipe, the mounting clamp is arranged at one end of the fixed support and is compatible with fixed supports of different thicknesses after being inserted and connected by fasteners, while reducing the punching of the fixed support; the variable length unit includes a variable length rod, a fisheye joint and a U-shaped connector, the fisheye joint is used to adapt to the deformation and movement of the expansion joint at multiple angles, and improve the measurement accuracy and service life; the on-site ruler is used to directly measure the length value of the expansion joint by sliding left and right when the expansion joint is deformed. The measuring method of the present invention is simple, the measurement result is intuitive, and the measurement accuracy is accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion joint deformation detection, and in particular to an expansion joint deformation detection device and a measurement method. Background Art

[0002] In the power system, expansion joints are often installed in gas-insulated combined electrical equipment GIS and gas-insulated metal-enclosed transmission lines GIL. The length of the expansion joints in different GIS and GIL varies, ranging from about 20 to 30 centimeters to 100 centimeters, to compensate for the deformation caused by thermal expansion and contraction due to temperature changes, so as to ensure the safe operation of equipment and pipelines. However, even considering the maximum temperature difference in different regions, the maximum deformation caused by temperature changes will be within a certain value, generally plus or minus ten centimeters. For gas-insulated equipment, the deformation of plus or minus ten centimeters is relatively large. If it cannot be compensated, it will greatly affect the sealing of the insulating and enclosed equipment. Therefore, it is necessary to conduct online detection of the deformation of the expansion joint and timely grasp the expansion amount so as to take necessary measures in advance. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a deformation detection device and a measurement method for an expansion joint, which includes a detection device and an installation and measurement method, has strong versatility, and is simple and convenient to install.

[0004] The technical solution adopted by the present invention is:

[0005] The present application provides a telescopic joint deformation detection device, comprising a plurality of mounting clamps, a U-shaped clamp, a variable length unit, an on-site ruler, a displacement sensor and a circuit board waterproof box, wherein:

[0006] The mounting clamp is connected with an expansion joint, and the expansion joint includes a bellows and fixed supports arranged at both ends of the bellows. The mounting clamp is arranged at one end of the fixed support and is compatible with fixed supports of different thicknesses after being inserted and connected by fasteners, while reducing the number of holes punched in the fixed support.

[0007] The variable length unit includes a variable length rod, a fisheye joint and a U-shaped connector, wherein the fisheye joint is used to adapt to the deformation and movement of the telescopic joint at multiple angles, thereby improving the measurement accuracy and service life;

[0008] The on-site ruler is used to directly measure the length value of the telescopic joint by sliding left and right when the telescopic joint is deformed;

[0009] The displacement sensor is used to measure the change value of the expansion joint.

[0010] Preferably, the mounting clamp is U-shaped, one side of the fixed support is inserted into the U-shaped opening of the mounting clamp, a fastening bolt is inserted into the vertical end of one end of the mounting clamp, the horizontal end of the U-shaped clamp is connected to the vertical end of the other end of the mounting clamp on one side through a fastener, and a fixing bolt is inserted between the vertical ends of the U-shaped clamp.

[0011] Preferably, the vertical end of one end of the mounting clamp on the other side is connected to a mounting bracket via a fastener, the mounting clamp is connected to a displacement sensor via the mounting bracket and the fastener, and the displacement sensor is connected to a fisheye joint at one end away from the mounting bracket.

[0012] Preferably, the displacement sensor is a resistance scale displacement sensor or other linear displacement sensor.

[0013] Preferably, the end of the fisheye joint away from the displacement sensor is connected to the U-shaped connector via a fastener, a scale mounting frame is vertically provided on the end of the fisheye joint close to the displacement sensor, a scale guide block is provided in the middle of the displacement sensor, one end of the field scale is fixedly connected to the scale mounting frame, and the other end of the field scale passes through the scale guide block and is set up parallel to the displacement sensor.

[0014] Preferably, the variable-length rods are all connected with anti-loosening nuts, one end of the variable-length rods is connected with a U-shaped connector and the other end is connected with an open-hole connector, and the open-hole connector is interlaced and connected with a fixing bolt.

[0015] Preferably, the circuit board waterproof box is arranged on the horizontal end of the mounting clamp close to the displacement sensor side, and a control circuit board is arranged in the circuit board waterproof box.

[0016] Preferably, the variable-length rod is made of stainless steel.

[0017] Based on the above-mentioned expansion joint deformation detection device, the present application also provides a measurement method using the above-mentioned expansion joint deformation detection device, comprising the following steps:

[0018] S1.According to the highest and lowest temperatures in the detection area, the maximum deformation range is ±A, and a displacement sensor with a range greater than 2A is selected. When installing the displacement sensor, the deformation direction and the deformation amount of the expansion joint should be estimated according to the current temperature. The displacement sensor should be placed to the left or right of the center, which is equivalent to the deformation amount of the expansion joint. The position at this time is the initial output value L0 of the displacement sensor;

[0019] S2. After the installation is completed, the length of the telescopic joint is detected to be L, the distance from the inner side of the fixed support of the telescopic joint close to the displacement sensor to the connection between the displacement sensor and the mounting bracket is detected to be L1, the distance from the position sensor to the center of the scale guide block is detected to be L2, and the distance from the center of the scale guide block to the connection between the fisheye joint and the U-shaped connector is detected to be L3;

[0020] S3. The distance from the connection point between the fisheye joint and the U-shaped connector to the inner side of the fixed support of the telescopic joint away from the displacement sensor is L4 = L-L1-L2-L3, where L4 includes the length of the variable length rod;

[0021] S4. During operation, if the temperature changes, causing the expansion joint to change, causing the sensor output Lx≠L0, then the change value ΔL=Lx-L0;

[0022] S5. The length of the expansion joint when working is Ln=L+ΔL.

[0023] Preferably, in step S4, during operation, when the temperature rises, ΔL is a positive number, and when the temperature drops, ΔL is a negative number.

[0024] The beneficial effects of the present invention are:

[0025] 1. The installation clamp is connected with the fixed support through insertion, and the distance between the relatively set fixed supports, that is, the length of the expansion joint, is adjusted by the connection degree between the fastening bolt and the installation clamp to adapt to the expansion joint fixed supports of different thicknesses and avoid drilling holes on the fixed supports;

[0026] 2. The variable length unit is used to adapt to the deformation measurement of expansion joints of any length, reducing the workload and simplifying the detection process;

[0027] 3. The fisheye joint and U-shaped connector can adapt to the longitudinal deformation such as settlement of the expansion joint installation position, adapt to the relative deformation and movement at multiple angles, improve the measurement accuracy, and avoid damage to the deformation detection device caused by connection in a single direction;

[0028] 4. The measurement method is simple, the measurement results are intuitive, and the measurement accuracy is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the connection of the expansion joint of the present invention;

[0031] Figure 2 is a connection diagram of a deformation detection device of the present invention;

[0032] Figure 3It is a schematic diagram of the detection distance of the deformation detection device of the present invention.

[0033] Marked in the figure: 1. Expansion joint, 11. Bellows, 12. Fixed support, 2. Deformation detection device, 21. Mounting clamp, 211. Fastening bolt, 212. Mounting bracket, 22. U-shaped clamp, 221. Fixing bolt, 23. Variable length unit, 231. Variable length rod, 232. Fisheye joint, 233. U-shaped connector, 234. Scale mounting bracket, 235. Opening connector, 236. Anti-loosening nut, 24. On-site scale, 25. Displacement sensor, 251. Scale guide block, 26. Circuit board waterproof box. DETAILED DESCRIPTION

[0034] like Figure 1-2 As shown, the present application provides a telescopic joint deformation detection device, including a plurality of mounting clamps 21, a U-shaped clamp 22, a variable length unit 23, an on-site scale 24, a displacement sensor 25 and a circuit board waterproof box 26, wherein:

[0035] like Figure 1-2 As shown, the mounting clamp 21 is connected with the expansion joint 1, and the expansion joint 1 includes a bellows 11 and fixed supports 12 arranged at both ends of the bellows 11. The mounting clamp 21 is arranged at one end of the fixed support 12 and is compatible with fixed supports 12 of different thicknesses after being inserted and connected by fasteners, while avoiding punching of the fixed support 12. The mounting clamp 21 is U-shaped, and one side of the fixed support 12 is inserted into the U-shaped opening of the mounting clamp 21. The vertical end of one end of the mounting clamp 21 is inserted with a fastening bolt 211. The horizontal end of the U-shaped clamp 22 is connected to the mounting clamp 21 on one side and the other side. The vertical ends of the ends are connected by fasteners, and fixing bolts 221 are inserted between the vertical ends of the U-shaped clamp 22. The vertical end of one end of the mounting clamp 21 on the other side is connected to the mounting bracket 212 through a fastener. The displacement sensor 25 is used to measure the change value of the expansion joint 1. The displacement sensor 25 adopts a resistance scale displacement sensor 25 or other linear displacement sensor 25. The mounting clamp 21 is connected to the displacement sensor 25 through the mounting bracket 212 and the fastener. The end of the displacement sensor 25 away from the mounting bracket 212 is connected to the fisheye joint 232.

[0036] like Figure 1-2As shown, the variable length unit 23 includes a variable length rod 231, a fisheye joint 232 and a U-shaped connector 233. The variable length rod 231 is made of stainless steel. The variable length rod 231 is connected with a locking nut 236. One end of the variable length rod 231 is connected to the U-shaped connector 233 and the other end is connected to an open hole connector 235. The open hole connector 235 is interlaced with the fixing bolt 221. The deformation of the telescopic joint 1 mainly changes along the axial direction, but it is also possible to produce a smaller deformation in the radial direction due to the settlement of the installation position or other reasons. The fisheye joint 232 is used to adapt to the deformation and movement of the telescopic joint 1 at multiple angles, improve the measurement accuracy, and also avoid the damage of the deformation detection device 2 caused by the connection in a single direction.

[0037] like Figure 1-2 As shown, the on-site ruler 24 is used to directly measure the length value of the telescopic joint 1 by sliding left and right when the telescopic joint 1 is deformed, the fisheye joint 232 is connected to the U-shaped connector 233 at one end away from the displacement sensor 25 by a fastener, and a ruler mounting frame 234 is vertically provided on the end of the fisheye joint 232 close to the displacement sensor 25, and a ruler guide block 251 is provided in the middle of the displacement sensor 25. One end of the on-site ruler 24 is fixedly connected to the ruler mounting frame 234, and the other end of the on-site ruler 24 passes through the ruler guide block 251 and is set up parallel to the displacement sensor 25.

[0038] like Figure 2 As shown, the circuit board waterproof box 26 is arranged on the horizontal end of the mounting clamp 21 close to the displacement sensor 25, and a control circuit board is arranged in the circuit board waterproof box 26.

[0039] like Figure 3 As shown, based on the above-mentioned expansion joint deformation detection device, the present application also provides a measurement method using the above-mentioned expansion joint deformation detection device, comprising the following steps:

[0040] S1. According to the highest and lowest temperatures in the detection area, the maximum deformation range is ±A, and a displacement sensor 25 with a range greater than 2A is selected. When installing the displacement sensor 25, the deformation direction and the deformation amount of the expansion joint 1 should be estimated according to the current temperature, and the displacement sensor 25 should be placed at a position slightly left or right of the center that is equivalent to the deformation amount of the expansion joint 1. The position at this time is the initial output value L0 of the displacement sensor 25;

[0041] S2. After the installation is completed, the length of the telescopic section 1 is detected to be L, the distance from the inner side of the fixed support 12 of the telescopic section 1 close to the displacement sensor 25 to the connection between the displacement sensor 25 and the mounting bracket 212 is L1, the distance from the position sensor to the center of the ruler guide block 251 is L2, and the distance from the center of the ruler guide block 251 to the connection between the fisheye joint 232 and the U-shaped connector 233 is L3;

[0042] S3. The distance L4 from the connection point between the fisheye joint 232 and the U-shaped connector 233 to the inner side of the fixed support 12 of the telescopic section 1 away from the displacement sensor 25 is L-L1-L2-L3, where L4 includes the length of the variable length rod 231;

[0043] S4. During operation, if the temperature changes, the telescopic joint 1 changes, and the change of the telescopic joint 1 causes the variable length rod 231 to change. The variable length rod 231 drives the field scale 24 to slide horizontally to both sides in the scale guide block 251 through the fisheye joint 232, so that the sensor outputs Lx≠L0, then the change value ΔL=Lx-L0, ΔL is a positive number when the temperature rises, and ΔL is a negative number when the temperature drops;

[0044] S5. The length of the expansion joint 1 when working is Ln=L+ΔL.

[0045] The invention has the advantages of simple measuring method, intuitive measuring result and accurate measuring precision.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for detecting deformation of an expansion joint, characterized in that: It includes multiple mounting clamps, U-shaped clamps, variable length units, field rulers, displacement sensors and circuit board waterproof boxes, among which: The mounting clamp is connected with an expansion joint, and the expansion joint includes a bellows and fixed supports arranged at both ends of the bellows. The mounting clamp is arranged at one end of the fixed support and is compatible with fixed supports of different thicknesses after being inserted and connected by fasteners, while reducing the number of holes punched in the fixed support. The variable length unit includes a variable length rod, a fisheye joint and a U-shaped connector, wherein the fisheye joint is used to adapt to the deformation and movement of the telescopic joint at multiple angles, thereby improving the measurement accuracy and service life; The on-site ruler is used to directly measure the length value of the telescopic joint by sliding left and right when the telescopic joint is deformed; The displacement sensor is used to measure the change value of the expansion joint; The mounting clamp is U-shaped, one side of the fixing support is inserted into the U-shaped opening of the mounting clamp, a fastening bolt is inserted through the vertical end of one end of the mounting clamp, the horizontal end of the U-shaped clamp is connected to the vertical end of the other end of the mounting clamp on one side through a fastener, and a fixing bolt is inserted between the vertical ends of the U-shaped clamp; The vertical end of one end of the mounting clamp on the other side is connected to a mounting bracket through a fastener, the mounting clamp is connected to a displacement sensor through the mounting bracket and the fastener, and the end of the displacement sensor away from the mounting bracket is connected to a fisheye joint; The end of the fisheye joint away from the displacement sensor is connected to the U-shaped connector through a fastener, a scale mounting frame is vertically provided on the end of the fisheye joint close to the displacement sensor, a scale guide block is provided in the middle of the displacement sensor, one end of the field scale is fixedly connected to the scale mounting frame, and the other end of the field scale passes through the scale guide block and is set up parallel to the displacement sensor; The variable-length rods are all connected with anti-loosening nuts, one end of the variable-length rods is connected with a U-shaped connector and the other end is connected with an open hole connector, and the open hole connector is interlaced and connected with a fixing bolt.

2. The expansion joint deformation detection device according to claim 1, characterized in that: The displacement sensor is a resistance scale displacement sensor or other linear displacement sensor.

3. The expansion joint deformation detection device according to claim 1, characterized in that: The circuit board waterproof box is arranged on the horizontal end of the mounting clamp close to one side of the displacement sensor, and a control circuit board is arranged in the circuit board waterproof box.

4. The expansion joint deformation detection device according to claim 1, characterized in that: The variable-length rod is made of stainless steel.

5. A measurement method using the expansion joint deformation detection device according to any one of claims 1 to 4, characterized in that: The steps include: S1.According to the highest and lowest temperatures in the detection area, the maximum deformation range is ±A, and a displacement sensor with a range greater than 2A is selected. When installing the displacement sensor, the deformation direction and the deformation amount of the expansion joint should be estimated according to the current temperature. The displacement sensor should be placed to the left or right of the center, which is equivalent to the deformation amount of the expansion joint. The position at this time is the initial output value L0 of the displacement sensor; S2. After the installation is completed, the length of the telescopic joint is detected to be L, the distance from the inner side of the fixed support of the telescopic joint close to the displacement sensor to the connection between the displacement sensor and the mounting bracket is detected to be L1, the distance from the position sensor to the center of the scale guide block is detected to be L2, and the distance from the center of the scale guide block to the connection between the fisheye joint and the U-shaped connector is detected to be L3; S3. The distance from the connection point between the fisheye joint and the U-shaped connector to the inner side of the fixed support on the side of the telescopic joint away from the displacement sensor is L4 = L - L1 - L2 - L3, where L4 includes the length of the variable length rod; S4. During operation, if the temperature changes, causing the expansion joint to change, causing the sensor output Lx ≠ L0, then the change value ΔL = Lx -L0; S5. The length of the expansion joint when working is Ln = L + ΔL.

6. The measuring method according to claim 5, characterized in that: In step S4, during operation, when the temperature rises, ΔL is a positive number, and when the temperature drops, ΔL is a negative number.

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