CN221826660U - Large-diameter straight tube steel-plastic conversion compression test device - Google Patents

Abstract

The utility model relates to the technical field of pipeline pressure resistance detection, and discloses a large-diameter straight-tube steel-plastic conversion pressure resistance detection device, comprising a frame, a base mechanism for vertically placing a pipeline, and a top cover mechanism corresponding to the base mechanism; the base mechanism is installed on the frame, the top cover mechanism is installed on the frame and suspended directly above the base mechanism, the top cover mechanism comprises a hydraulic cylinder, a sealing top cover, an air guide pipe and a pressure gauge, the fixed end of the hydraulic cylinder is fixedly connected to the frame, the telescopic end of the hydraulic cylinder is fixedly connected to the sealing top cover, the air outlet end of the air guide pipe is arranged on the lower surface of the top cover seal, the air inlet end of the air guide pipe is externally connected to an air charging device, and the air guide pipe is connected to the pressure gauge; the problem of uneven force on the pipeline wall in the existing pressure resistance detection device caused by external force punching the outer wall of the pipeline is solved.

Description

Large-diameter straight tube steel-plastic conversion compression test device

Technical Field

The utility model relates to the technical field of pipeline pressure resistance detection, in particular to a large-diameter straight-tube steel-plastic conversion pressure resistance detection device.

Background Art

The steel-plastic conversion pipe consists of a two-layer structure, that is, the outer layer of the steel pipe is wrapped with heat-shrinkable anti-corrosion material. The steel pipe material has strong pressure-bearing performance, and the outer layer material is tightly bonded to the surface of the steel pipe, forming a solid anti-corrosion body outside the pipeline. It has excellent wear resistance, corrosion resistance, impact resistance, and good resistance to UV and light aging. It is often used in large-diameter buried natural gas pipelines.

After the steel-plastic conversion pipe is produced, it is necessary to conduct a pressure test to determine whether the quality of the finished steel-plastic conversion pipe meets the standards; for example, the Chinese patent "A Petroleum Pipeline Pressure Resistance Detection Device" with application number CN202023346468.6, the existing pipeline pressure resistance detection device uses equipment to pressurize the outer wall of the pipeline by external force stamping, etc., and detects the real-time pressure size through a pressure sensor;

However, during the testing process, the pressure resistance testing device usually applies external force to a single or multiple locations on the outer wall of the pipeline, resulting in uneven force on the outer wall of the pipeline, with only a local area of the pipeline receiving the maximum force. If effective pressure resistance testing is to be performed on all sides of the pipeline, it is necessary to move and adjust the force position of the pipeline, which is more troublesome, and it is impossible to artificially ensure that the pipeline wall is effectively pressure-resistant all around. Moreover, the external force stamping method can easily cause deformation of the outer layer of anti-corrosion material, affecting the quality of the finished product. Moreover, the pressure resistance testing device determines the quality of the pipeline by its deformation, and is unable to detect the airtightness of the pipeline, let alone simulate the actual pressure resistance of the steel-plastic conversion pipe as a natural gas pipeline.

Utility Model Content

The utility model aims to provide a large-diameter straight-tube steel-plastic conversion pressure-resistant detection device to solve the problem that the existing pressure-resistant detection device has uneven force on the pipe wall due to external force punching the outer wall of the pipe.

To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a large-diameter straight pipe steel-plastic conversion compression resistance detection device, comprising a frame, a base mechanism for vertically placing the pipe, and a top cover mechanism corresponding to the base mechanism;

The base mechanism is installed on the frame, the top cover mechanism is installed on the frame and suspended directly above the base mechanism, the top cover mechanism includes a hydraulic cylinder, a top cover, an air duct and a pressure gauge, the fixed end of the hydraulic cylinder is fixedly connected to the frame, the telescopic end of the hydraulic cylinder is fixedly connected to the top cover, the air outlet end of the air duct is arranged on the lower surface of the top cover, the air inlet end of the air duct is connected to the inflation device, and the air duct is connected to the pressure gauge.

The principle and advantages of this scheme are: in actual application, a large-diameter straight steel-plastic conversion pipe is placed vertically on the base mechanism, the operator controls the hydraulic cylinder to start, the top cover moves down to press the upper end of the pipe, at this time, the upper and lower ports of the vertical pipe are pressed and sealed by the base mechanism and the top cover mechanism respectively, the inflation device is turned on, and the air guide pipe is inflated, and the gas enters the detected pipe from the gas outlet end of the air guide pipe. The input gas forms a high pressure in the closed pipe to squeeze the inner wall of the pipe. The operator can observe the pressure in the pipe by the pressure gauge, and the operator can adjust the pressure of the gas input into the detection pipe by adjusting the inflation device;

The device applies pressure to the inner wall of the pipeline by gas pressure, so that the inner wall of the pipeline can be effectively tested all around with force. The gas used as the medium for applying pressure will not cause damage to the surface of the pipeline. The large-diameter straight-tube steel-plastic conversion pipe is used as a natural gas transportation pipe. The gas pressure is used to test its pressure resistance while also testing its air tightness, which is more in line with its performance. Only one operation is required to ensure that the pipeline wall is effectively tested all around, and the operation is convenient.

As an improvement, the base mechanism includes a rigid base and a rubber base pad, the rigid base is fixedly connected to the frame, and the rubber base pad is fixedly connected to the upper surface of the rigid base.

The beneficial effect of this improvement is that the rubber base pad can better temporarily seal the lower end of the pipeline, thereby improving the accuracy of detection.

As an improvement, the rubber base pad is provided with a limiting groove for plugging into the pipe opening.

The beneficial effect of this improvement is that the lower end of the pipe is inserted into the limiting groove, so that the pipe can be placed on the rubber base pad more stably, and the base mechanism and the top cover mechanism can better clamp and seal the pipe.

As an improvement, the sealing top cover includes a rigid top cover and a rubber cover pad, the top end of the rigid top cover is detachably connected to the telescopic end of the hydraulic cylinder, the air duct is fixedly and sealingly connected to the rigid top cover, the rubber cover pad is fixedly connected to the lower surface of the rigid top cover, and the rubber cover pad is provided with a notch to avoid the air outlet end of the air duct.

The beneficial effects of this improvement are: the rubber cover gasket can better temporarily seal the upper end of the pipeline, thereby improving the accuracy of detection, and at the same time the sealing top cover can be disassembled as a whole and replaced with a top cover that adapts to pipelines of different sizes; for example, if the pipeline section is short and the hydraulic rod is not long enough for a good seal, it can be replaced with a sealing top cover with a thicker rigid top cover to extend the overall length of the top cover mechanism, thereby achieving a better sealing effect.

As an improvement, the thickness of the rubber bottom pad and the rubber cover pad is 1-2 cm.

The beneficial effect of this improvement is to ensure that the rubber base gasket and the rubber cover gasket can effectively seal the two ends of the pipeline.

As an improvement, the frame is provided with a plurality of corresponding groups of the base mechanisms and the top cover mechanisms.

The beneficial effect of this improvement is that the pressure resistance detection device can detect multiple pipelines at the same time, and because the sealing top cover can be replaced as a whole, the device can detect multiple pipelines with different signals at the same time, which improves the detection efficiency and makes the use of the detection device more flexible.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of an embodiment of the utility model.

DETAILED DESCRIPTION

The following is further described in detail through specific implementation methods:

The reference numerals in the drawings of the specification include: a frame 1, a hydraulic cylinder 2, an air guide tube 3, a pressure gauge 4, a rigid top cover 5, a rubber cover pad 6, a rigid base 7, a rubber bottom pad 8, a limiting groove 9 and a detection pipeline 10.

Example

Basically as shown in FIG. 1 , a large-diameter straight pipe steel-plastic conversion compression resistance testing device comprises a frame 1, a base mechanism for vertically placing the pipe, and a top cover mechanism corresponding to the base mechanism, wherein the frame 1 is a frame made of a rigid metal material, and is used to form the remaining structure of the device for fixing;

The top cover mechanism includes a hydraulic cylinder 2, a sealing top cover, an air guide pipe 3 and a pressure gauge 4. The sealing top cover includes a rigid top cover 5 and a rubber cover pad 6. The fixed end of the hydraulic cylinder 2 is fixedly connected to the frame 1 by bolts, and the telescopic end of the hydraulic cylinder 2 is detachably connected to the middle part of the rigid top cover 5 by bolts. The rigid top cover 5 is a disc-shaped disc matching the diameter of the pipeline. The lower surface of the rigid top cover 5 is fixedly bonded with a rubber cover pad 6, which can completely seal and cover the upper port of the pipeline; the outlet end of the air guide pipe 3 passes through the sealing top cover, and the outlet is located on the rubber cover pad. 6, the air duct 3 and the sealing top cover are sealed and bonded, the air inlet end of the air duct 3 is externally connected to the inflation device, and the air is input into the air duct 3 by the inflation device; the pressure gauge 4 is installed on the frame 1 by bolts, which is convenient for the operator to observe the reading of the pressure gauge, the air duct 3 is connected with the pressure gauge 4, because the sealing top cover seals the upper end of the detection pipeline, the air outlet port of the air duct 3 is connected with the closed pipeline, and the air pressure in the air duct 3 is the same as the air pressure in the pipeline, and the pressure gauge 4 detects the air pressure in the air duct 3 to obtain the air pressure in the detection pipeline.

The base mechanism includes a rigid base 7 and a rubber base pad 8. The rigid base 7 is fixedly connected to the frame 1 by bolts. The rubber base pad 8 is fixedly bonded to the upper surface of the rigid base 7. The rigid base 7 is disc-shaped. In order to enable the detection pipeline to be stably placed on the base mechanism, a limiting groove 9 for plugging the pipeline port is provided on the rubber base pad 8. The limiting groove 9 is consistent with the diameter of the pipeline, so that the lower end of the pipeline can be completely embedded in the limiting groove 9. The limiting groove 9 is an annular groove. The groove width of the groove is the same as the thickness of the pipeline wall. The lower end of the pipeline and the rubber base pad 8 are in a concave-convex contact manner, which further enhances the sealing effect of the base mechanism.

Because the rigid base 7 and the frame 1 are connected by bolts, for pipes of different diameters, the overall base mechanism can be replaced with a limiting groove that better fits the current pipe diameter; and the thickness of the rubber bottom pad 8 and the rubber cover pad 6 is 1-2cm; a plurality of corresponding base mechanisms and top cover mechanisms are provided on the frame. In this embodiment, three groups of corresponding base mechanisms and top cover mechanisms are provided, and the detection device can detect three pipes at the same time.

The specific implementation process is as follows:

Place the detection pipe 10 vertically on the rubber base pad 8 so that the lower end of the detection pipe 10 is embedded in the limiting groove 9, start the hydraulic cylinder 2 to move the sealing top cover downward until the rubber cover pad 6 presses the upper end surface of the detection pipe 10, and the rubber base pad 8 and the rubber cover pad 6 respectively squeeze the detection pipe 10 inward. Due to the high elasticity of the rubber base pad 8 and the rubber cover pad 6, the rubber base pad 8 and the rubber cover pad 6 produce corresponding elastic deformation according to the shapes of the upper and lower ends of the detection pipe 10 without destroying the shape of the detection pipe 10, so that a seamless tight fit is formed between the rubber base pad 8 and the rubber cover pad 6 and the detection pipe 10, the upper and lower ends of the detection pipe 10 are sealed, and a closed space is formed inside the detection pipe 10.

Start the inflation device, and the air flow flows from the air inlet end of the air duct 3 through the pressure gauge 4 to the air outlet end of the air duct 3 and finally enters the enclosed space of the detection pipe 10. The air intake amount of the inflation device is set to control the air pressure in the detection pipe 10. The pressure gauge 4 can be used to observe the current air pressure value in the detection pipe 10, and the detection pipe 10 is controlled to be at a preset air pressure value and maintained for a preset time. The indication of the pressure gauge 4 can be used to determine whether there is a leak in the detection pipe 10 under high pressure conditions.

The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and/or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the technical solution of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims (6)

1. A large-diameter straight-tube steel-plastic conversion compression test device, characterized in that it includes a frame, a base mechanism for vertically placing the pipe, and a top cover mechanism corresponding to the base mechanism; The base mechanism is installed on the frame, the top cover mechanism is installed on the frame and suspended directly above the base mechanism, the top cover mechanism includes a hydraulic cylinder, a sealed top cover, an air duct and a pressure gauge, the fixed end of the hydraulic cylinder is fixedly connected to the frame, the telescopic end of the hydraulic cylinder is fixedly connected to the sealed top cover, the air outlet end of the air duct is arranged on the lower surface of the top cover seal, the air inlet end of the air duct is externally connected to an inflation device, and the air duct is connected to the pressure gauge. 2. According to the large-diameter straight tube steel-plastic conversion compression resistance detection device described in claim 1, it is characterized in that: the base mechanism includes a rigid base and a rubber base pad, the rigid base is fixedly connected to the frame, and the rubber base pad is fixedly connected to the upper surface of the rigid base. 3. The large-diameter straight-tube steel-plastic conversion compression resistance detection device according to claim 2 is characterized in that a limiting groove for plugging in the pipe opening is provided on the rubber base pad. 4. The large-diameter straight tube steel-plastic conversion pressure resistance detection device according to claim 3 is characterized in that: the sealed top cover includes a rigid top cover and a rubber cover pad, the top end of the rigid top cover is detachably connected to the telescopic end of the hydraulic cylinder, the air duct is fixedly and sealedly connected to the rigid top cover, the rubber cover pad is fixedly connected to the lower surface of the rigid top cover, and the rubber cover pad is provided with a notch to avoid the air outlet end of the air duct. 5. The large-diameter straight-tube steel-plastic conversion compression resistance detection device according to claim 4 is characterized in that the thickness of the rubber base pad and the rubber cover pad is 1-2 cm. 6. The large-diameter straight-tube steel-plastic conversion compression resistance detection device according to claim 5 is characterized in that: a plurality of corresponding groups of the base mechanism and the top cover mechanism are provided on the frame.