A buried pipeline detection device with replaceable inspection piece

Abstract

The present invention discloses a buried pipeline detection device with a replaceable inspection piece, the detection device comprises an inspection piece assembly and a support assembly, the inspection piece assembly comprises a columnar base and a columnar inspection piece, the columnar base is provided with a coaxial mounting hole and a threaded through hole from bottom to top, the columnar inspection piece is installed in the mounting hole of the columnar base, a heat shrink sleeve is provided between the peripheral wall of the columnar inspection piece and the columnar base, and a threaded blind hole is provided at the top of the columnar inspection piece; the support assembly comprises a screw and a hollow support rod, an insulating sealing block is provided in the lower end inner cavity of the support rod, a protective cap is provided at the upper end of the support rod, the upper half of the screw is embedded in the insulating sealing block, and a cable is connected to the screw; the inspection piece assembly is screwed on the screw from bottom to top through the threaded through hole of the columnar base and the threaded blind hole of the columnar inspection piece. The present invention has the advantages of being convenient for on-site disassembly and replacement and quick and convenient re-installation, being recyclable, and being suitable for wide promotion and application.

Description

Technical Field

[0001] The invention relates to the field of pipeline cathode protection detection, and in particular to a buried pipeline detection device with a replaceable inspection piece. Background Art

[0002] In the prior art, along the gas pipeline network, test piles are set up according to the corresponding specifications. The test piles are mainly used to detect cathodic protection parameters and are essential devices in pipeline management and maintenance. Cathodic protection pile operation and maintenance personnel need to test the pipeline potential regularly to ensure that the pipeline's cathodic protection system operates normally. However, the test piles can only obtain the power-on potential, and cannot obtain the parameters of the pipeline corrosion rate.

[0003] Regarding how to obtain the corrosion rate of buried pipelines, the industry mainly obtains it through ultrasonic wall thickness measurement, ER corrosion rate probe test method and corrosion inspection piece test method. The testing costs of the first two methods are relatively high, and the validity of their test results still needs more field data to be verified, resulting in limited application prospects. The corrosion inspection piece test method is currently the most mature and most commonly used method for testing the external corrosion rate of pipelines. However, in the prior art, the detection components are often fixedly connected to the inspection piece, which is not easy to disassemble. Only one-time detection can be performed and it cannot be recycled, resulting in a waste of resources. At the same time, large earth excavation is required for on-site installation and disassembly, and the testing cost is relatively high. Summary of the invention

[0004] The purpose of the present invention is to provide a buried pipeline detection device with a replaceable inspection piece which is convenient for on-site disassembly and installation and can be quickly and conveniently installed and can be recycled.

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a buried pipeline detection device with a replaceable inspection piece, the inspection piece assembly comprises a columnar base and a columnar inspection piece, the columnar base is provided with a coaxial mounting hole and a threaded through hole from bottom to top, the columnar inspection piece is installed in the mounting hole of the columnar base from bottom to top, a heat shrink sleeve is provided between the peripheral wall of the columnar inspection piece and the columnar base, and a threaded blind hole is provided on the top of the columnar inspection piece; the support assembly comprises a screw and a hollow support rod, an insulating sealing block is provided in the inner cavity of the lower end of the support rod, a protective cap is provided at the upper end of the support rod, the upper half of the screw is embedded in the insulating sealing block, and the screw is connected with a cable that passes through the insulating sealing block, the inner cavity of the support rod and the protective cap in sequence; the inspection piece assembly is screwed on the screw from bottom to top through the threaded through hole of the columnar base and the threaded blind hole of the columnar inspection piece.

[0006] Furthermore, the present invention provides a buried pipeline detection device with a replaceable inspection piece, wherein a sealing ring is provided between the columnar base and the support rod and the insulating sealing block.

[0007] Furthermore, the present invention provides a buried pipeline detection device with a replaceable inspection piece, wherein the lower end of the columnar inspection piece extends out of the columnar base.

[0008] Furthermore, the present invention provides a buried pipeline detection device with a replaceable inspection piece, wherein the protective cap is made of polytetrafluoroethylene material and is hollow inside, and the protective cap includes a transition portion and an extension portion, the outer diameter of the transition portion of the protective cap first gradually decreases along one end close to the support tube toward the free end, and then the outer diameter of the extension portion remains unchanged and extends outward, the inner diameter of the extension portion is smaller than the outer diameter of the cable, and the cable passes through the protective cap after the extension portion expands.

[0009] Furthermore, the present invention provides a buried pipeline inspection device with a replaceable inspection piece, wherein the material of the screw rod is the same as the material of the cylindrical inspection piece.

[0010] Furthermore, the present invention provides a buried pipeline detection device with a replaceable inspection piece, wherein the sealing ring is an O-ring.

[0011] Furthermore, the present invention provides a buried pipeline detection device with a replaceable inspection piece, wherein the insulating sealing block is made of epoxy resin material.

[0012] Furthermore, the present invention provides a buried pipeline detection device with a replaceable inspection piece, wherein the protruding end of the columnar inspection piece is circular or square.

[0013] Compared with the prior art, the buried pipeline detection device with a replaceable inspection piece of the present invention has the following advantages: the detection device includes an inspection piece assembly and a support assembly, wherein the inspection piece assembly includes a columnar base and a columnar inspection piece, the columnar base is provided with a coaxial mounting hole and a threaded through hole from bottom to top, the columnar inspection piece is installed in the mounting hole of the columnar base from bottom to top, a heat shrink sleeve is provided between the peripheral wall of the columnar inspection piece and the columnar base, and a threaded blind hole is provided on the top of the columnar inspection piece; the support assembly includes a screw rod and a hollow support rod, an insulating sealing block is provided in the inner cavity at the lower end of the support rod, a protective cap is provided at the upper end of the support rod, the upper half of the screw rod is embedded in the insulating sealing block, and the screw rod is connected with a cable that passes through the insulating sealing block, the inner cavity of the support rod and the protective cap in sequence; the inspection piece assembly is screwed onto the screw rod from bottom to top through the threaded through hole of the columnar base and the threaded blind hole of the columnar inspection piece. Under normal circumstances, the detection device is buried underground. During the detection, the corresponding equipment is connected by cables, and the corrosion rate detection can be carried out at any time. The columnar inspection piece can be detachably connected to the columnar base. The detection device is pulled out and replaced only when the columnar inspection piece is damaged. After replacement, the detection device should be buried underground again. Except for the columnar inspection piece, the parts can be recycled, which reduces the production cost. The buried detection device is carried out by drilling, so there is no need for large-scale earth excavation, which reduces the installation cost, and is therefore suitable for large-scale promotion and application.

[0014] The buried pipeline detection device with replaceable inspection piece of the present invention is further described in detail below in conjunction with the specific embodiments shown in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic structural diagram of a buried pipeline detection device with replaceable inspection pieces.

[0016] Figure 2 The present invention is a schematic diagram of the on-site installation structure of a buried pipeline detection device with replaceable inspection pieces. DETAILED DESCRIPTION

[0017] like Figure 1 As shown, a specific embodiment of a buried pipeline inspection device with a replaceable inspection piece of the present invention comprises an inspection piece assembly and a support assembly, characterized in that the inspection piece assembly comprises a columnar base 1 and a columnar inspection piece 2, the columnar base 1 is provided with a coaxial mounting hole and a threaded through hole from bottom to top, the columnar inspection piece 2 is installed in the mounting hole of the columnar base 1 from bottom to top, a heat shrink sleeve 3 is provided between the peripheral wall of the columnar inspection piece 2 and the columnar base 1, wherein the heat shrink sleeve 3 is used to prevent corrosion between the columnar base 1 and the columnar inspection piece Corrosion affects the test results. A threaded blind hole is provided at the top of the cylindrical inspection piece 2. The support assembly includes a screw 4 and a hollow support rod 5. An insulating sealing block 6 is provided in the inner cavity of the lower end of the support rod 5. A protective cap 7 is provided at the upper end of the support rod 5. The upper half of the screw 4 is embedded in the insulating sealing block 6. The screw 4 is connected with a cable 8 that passes through the insulating sealing block 6, the inner cavity of the support rod 5 and the protective cap 7 in sequence. The inspection piece assembly is screwed on the screw 4 from bottom to top through the threaded through hole of the cylindrical base 1 and the threaded blind hole of the cylindrical inspection piece 2. Under normal circumstances, the detection device is buried underground. During the detection, the corresponding equipment is connected by a cable, and the corrosion rate detection can be carried out at any time. The cylindrical inspection piece 2 can be detachably connected to the cylindrical base 1. The detection device is pulled out and replaced only when the cylindrical inspection piece 2 is damaged. After replacement, the detection device should be buried underground again. The components except the cylindrical inspection piece 2 can be recycled, which reduces the production cost. The buried detection device is installed by drilling, so there is no need for large-scale earth excavation, which reduces the installation cost and is therefore suitable for large-scale promotion and application.

[0018] like Figure 1 As shown, in one embodiment of the present invention, as a specific implementation, the upper end opening of the support rod 5 is exposed outside the ground surface (such as Figure 2As shown), moisture may enter the support rod 5 due to rain and dew, etc. After the moisture enters and exits the support rod 5, it contacts the screw 4 and causes galvanic corrosion, which affects the test data. Therefore, a protective cap 7 is fixedly connected to the top opening of the support tube 5, and an insulating sealing block 6 is provided in the inner cavity at the lower end of the support rod 5. Among them, the insulating sealing block 6 can be made of epoxy resin. Of course, it can also be made of other materials under the condition that its performance requirements are met. The double sealing of the protective cap 7 and the insulating sealing block 6 prevents the entry of moisture and prevents the detection results from being interfered with by external factors. The other end of the cable 8 passes through the inner cavity of the support rod 5 and comes out of the protective cap 7, which is convenient for connection with external test equipment. By setting the above structure, the overall sealing effect of the inspection device is greatly improved.

[0019] In one embodiment of the present invention, as a specific implementation method, in order to facilitate the effective contact between the cylindrical inspection piece 2 and the buried ground, without destroying the overall sealing of the detection device, the lower end of the pipeline cylindrical inspection piece 2 extends out of the cylindrical base 1. In order to adapt to the needs in different situations, the extended end of the cylindrical inspection piece 2 can be designed to be round or square.

[0020] In one embodiment of the present invention, as a specific implementation method, in order to improve the detection accuracy of the detection device and reduce the test error, the screw 4 is used as the intermediate connecting medium between the cable 8 and the cylindrical inspection piece 2. If the material of the cylindrical inspection piece 2 and the screw 4 are different, the corrosion rate of the cylindrical inspection piece will be accelerated or slowed down, which will affect the result of the measured corrosion rate. Therefore, the material of the screw 4 is the same as that of the cylindrical inspection piece 2, and steel material can be preferably used on the premise of meeting the detection requirements.

[0021] In one embodiment of the present invention, as a preferred embodiment, a sealing ring 9 is provided between the columnar base 1 and the support rod 5 and the insulating sealing block 6. The sealing ring 9 can be an O-ring or other types of sealing gaskets to meet the sealing requirements between the support rod 5 and the columnar base 1.

[0022] In one embodiment of the present invention, as a specific implementation method, the protective cap 7 is preferably made of polytetrafluoroethylene material and is hollow inside. The protective cap 7 includes a transition portion and an extension portion. The outer diameter of the transition portion of the protective cap 7 first gradually decreases along one end close to the support rod 5 to the free end, and then the outer diameter of the extension portion remains unchanged and extends outward. The inner diameter of the extension portion is smaller than the outer diameter of the cable 8. The length of the extension portion can be increased as needed. The longer the length of the extension portion, the better the sealing and waterproof effect. During installation, the cable 8 will expand the extension portion and then pass through the protective cap 7.

[0023] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of protection of the present invention. Without departing from the design concept of the present invention, various modifications made by those skilled in the art based on the technical solution of the present invention should all fall within the scope of protection determined by the claims of the present invention.

Claims

1. A buried pipeline inspection device with a replaceable inspection piece, comprising an inspection piece assembly and a support assembly, characterized in that: The inspection piece assembly comprises a columnar base (1) and a columnar inspection piece (2); the columnar base (1) is provided with a coaxial mounting hole and a threaded through hole from bottom to top; the columnar inspection piece (2) is installed in the mounting hole of the columnar base (1) from bottom to top; a heat shrink sleeve (3) is provided between the peripheral wall of the columnar inspection piece (2) and the columnar base (1); and a threaded blind hole is provided at the top of the columnar inspection piece (2); the support assembly comprises a screw rod (4) and a hollow support rod (5); an insulating sealing block (6) is provided in the inner cavity at the lower end of the support rod (5); and the upper end of the support rod (5) is provided with a threaded blind hole. A protective cap (7) is provided at the end, the upper half of the screw rod (4) is embedded in the insulating sealing block (6), and the screw rod (4) is connected to a cable (8) that passes through the insulating sealing block (6), the inner cavity of the support rod (5) and the protective cap (7) in sequence; the inspection piece assembly is screwed onto the screw rod (4) from bottom to top through the threaded through hole of the columnar base (1) and the threaded blind hole of the columnar inspection piece (2), the material of the screw rod (4) is the same as that of the columnar inspection piece (2), and a sealing ring (9) is provided between the columnar base (1), the support rod (5) and the insulating sealing block (6).

2. The buried pipeline detection device with replaceable inspection piece according to claim 1, characterized in that: The lower end of the columnar inspection piece (2) extends out of the columnar base (1).

3. The buried pipeline detection device with replaceable inspection piece according to claim 1, characterized in that: The protective cap (7) is made of polytetrafluoroethylene and is hollow inside. The protective cap (7) comprises a transition portion and an extension portion. The outer diameter of the transition portion of the protective cap (7) gradually decreases from one end close to the support tube to the free end. Then, the outer diameter of the extension portion remains unchanged and extends outward. The inner diameter of the extension portion is smaller than the outer diameter of the cable (8). The cable (8) passes through the protective cap (7) after expanding the extension portion.

4. The buried pipeline detection device with replaceable inspection piece according to claim 1, characterized in that: The sealing ring (9) is an O-type sealing ring.

5. The buried pipeline detection device with replaceable inspection piece according to claim 1, characterized in that: The insulating sealing block (6) is made of epoxy resin material.

6. The buried pipeline detection device with replaceable inspection piece according to claim 2, characterized in that: The protruding end of the columnar inspection piece (2) is round or square.

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