CN113587799A

CN113587799A - Device and method for measuring wall thickness of middle section of PE (polyethylene) pipe

Info

Publication number: CN113587799A
Application number: CN202110999391.2A
Authority: CN
Inventors: 高昆仑
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-29
Filing date: 2021-08-29
Publication date: 2021-11-02

Abstract

The invention relates to a device and a method for measuring the wall thickness of the middle section of a PE (polyethylene) pipe, which effectively solve the problem that the thickness of the PE pipe at any position cannot be accurately measured; the technical scheme includes that the device comprises a cylindrical shell and a magnetic thickness gauge, the shell is transversely placed, a plurality of radial chambers are uniformly distributed on the circumference of the shell, a channel is formed in the center of the shell and communicated with the chambers, the left end of the channel is connected with a piston through a hose, and liquid is filled in the first piston; scale marks are arranged on a piston rod of the piston along the length direction, and a supporting structure is arranged in each cavity; the supporting structure comprises a supporting rod arranged in the cavity, a sliding block capable of moving up and down along the supporting rod is arranged on the supporting rod, a left transverse telescopic rod and a right transverse telescopic rod are fixed on the sliding block, reels are arranged at the end parts of the two telescopic rods, and metal coils are wound on the reels; the metal coil can be spread and paved on the inner wall of the pipeline, and the invention can carry out multi-point detection on any position.

Description

Device and method for measuring wall thickness of middle section of PE (polyethylene) pipe

Technical Field

The invention relates to the technical field of PE pipe processing, in particular to a device and a method for measuring the wall thickness of a middle section of a PE pipe.

Background

For the thickness detection of the pipeline, the caliper is usually adopted for the conventional detection to detect the thickness of the end part of the pipeline, and the thickness of the middle part or any part of the pipeline cannot be detected. In addition, some devices use ultrasound to detect the thickness, but the devices can only be used for magnetic pipelines and can not be used for non-magnetic pipelines, and the ultrasound is easily interfered and the measurement is inaccurate. Therefore, the following problems mainly exist in the non-magnetic pipe thickness measurement of the PE pipe: 1. thickness detection cannot be carried out at any position of the non-magnetic pipeline; 2. how to adapt to pipelines with different diameters; 3. the single measurement mode and the single tool have misdetection, and cannot be contrasted and analyzed; 4. how to perform nondestructive detection without damaging the pipeline; 5. how quickly to make a reading.

Disclosure of Invention

In view of the above situation, in order to solve the problems in the prior art, the present invention aims to provide a device and a method for measuring the wall thickness of the middle section of a PE pipe, which can effectively solve the problems that the thickness of the PE pipe at any position cannot be accurately measured.

The technical scheme includes that the device comprises a cylindrical shell and a magnetic thickness gauge, the shell is transversely placed, a plurality of radial chambers are uniformly distributed on the circumference of the shell, a channel is formed in the center of the shell and communicated with the chambers, the left end of the channel is connected with a piston through a hose, and liquid is filled in the first piston; scale marks are arranged on a piston rod of the piston along the length direction, and a supporting structure is arranged in each cavity;

the supporting structure comprises a supporting rod arranged in the cavity, a sliding block capable of moving up and down along the supporting rod is arranged on the supporting rod, a left transverse telescopic rod and a right transverse telescopic rod are fixed on the sliding block, the telescopic rods can be actively contracted, two supporting rods are connected to the end part of the supporting rod in a cross mode, and the other ends of the two supporting rods are hinged to the two telescopic rods respectively; the end parts of the two telescopic rods are respectively provided with a scroll, and a metal coil is wound on the scroll; the end parts of the two metal coils are fixed with the outer end of the supporting rod; the outer end of the supporting rod is provided with a blind hole, a guide rod capable of moving along the length direction of the supporting rod is inserted in the blind hole, and a rope is connected between the inner end of the guide rod and the sliding block.

The inner of every bracing piece all be provided with the rubber buffer.

The metal coil can be automatically coiled under the action of self elasticity.

And the piston is provided with a compression bolt.

The telescopic rod consists of an inner core and an outer sleeve, the outer sleeve can move the inner core, and a tension spring is connected between the outer sleeve and the inner core; the hinged point of the supporting rod and the telescopic rod is positioned on the outer sleeve of the telescopic rod.

The support rod is provided with a rope through hole, and the middle part of the rope penetrates through the rope through hole.

The guide rod is divided into a plurality of sections, and the plurality of sections of guide rods are connected through a threaded structure.

The operation steps comprise:

the first step is as follows: inserting the shell into the pipe to be tested, and firstly pushing the piston to enable the outer end of the supporting rod to be in contact with the inner wall of the pipe to be tested;

the second step is that: using a magnetic thickness meter to directly read the position of the metal coil spread on the inner wall of the outer side of the pipeline to be measured;

the third step: deducing all feed amounts of the support rods according to the feed amount of the piston rods in the pistons, thereby obtaining the average inner diameter of the pipeline, and measuring the outer diameter by using a caliper, thereby obtaining the average thickness;

the fourth step: and comparing the data obtained in the third step with the data obtained in the fourth step, and processing the data.

The invention has the advantages that:

1. the device is suitable for non-magnetic pipelines, and can carry out multi-point detection on any position without damaging the pipelines;

2. the device can be adaptive to pipelines with different diameters;

3. reading directly by a magnetic thickness meter, and calculating the thickness by the telescopic amount of the first piston; the two modes are compared, so that the numerical value is more accurate.

4. Meanwhile, the device is suitable for various non-magnetic pipelines, and the thickness can be measured regardless of the size.

Drawings

Fig. 1 is a front view of the present invention.

FIG. 2 is a left side sectional view of the present invention (before measurement).

Fig. 3 is a left side sectional view of the present invention (when measured).

Fig. 4 is a partially enlarged view of a portion a in fig. 2.

Fig. 5 is a partially enlarged view of fig. 3 at B.

Detailed Description

The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1 to 5, the magnetic thickness gauge comprises a cylindrical shell 1 and a magnetic thickness gauge 2, wherein the shell 1 is transversely placed, a plurality of radial chambers 3 are uniformly distributed on the circumference of the shell 1, a channel 4 is formed in the center of the shell 1, the channel 4 is communicated with the chambers 3, the left end of the channel 4 is connected with a piston 6 through a hose 5, and a first piston 6 is filled with liquid; scale marks 7 are arranged on a piston 6 rod of the piston 6 along the length direction, and a supporting structure 8 is arranged in each chamber 3;

the supporting structure 8 comprises a supporting rod 801 arranged in the chamber 3, a sliding block 802 capable of moving up and down along the supporting rod 801 is arranged on the supporting rod 801, a left transverse telescopic rod 803 and a right transverse telescopic rod 803 are fixed on the sliding block 802, the telescopic rods 803 can actively contract, two supporting rods 804 are connected to the end part of the supporting rod 801 in an intersecting manner, and the other ends of the two supporting rods 804 are respectively hinged to the two telescopic rods 803; the end parts of the two telescopic rods 803 are respectively provided with a scroll, and a metal coil 805 is wound on the scroll; the ends of the two metal coils 805 are fixed with the outer end of the support bar 801; the outer end of the supporting rod 801 is provided with a blind hole, a guide rod 806 capable of moving along the length direction of the supporting rod 801 is inserted in the blind hole, and a rope 807 is connected between the inner end of the guide rod 806 and the sliding block 802.

In order to realize the propulsion of the supporting rods 801, the inner end of each supporting rod 801 is provided with a rubber plug 808.

In order to realize paving, the metal coil 805 can be automatically coiled under the action of self elasticity.

For convenience of fixing, the piston 6 is provided with a compression bolt 9.

In order to realize the extension and the automatic contraction, the extension rod 803 consists of an inner core and an outer sleeve, the outer sleeve can move along with the inner core, and a tension spring is connected between the outer sleeve and the inner core; the hinge point of the supporting rod 804 and the telescopic rod 803 is located on the outer sleeve of the telescopic rod 803.

In order to prevent the guide rod 806 from being disengaged, a rope threading hole 809 is formed on the support rod 801, and the middle part of the rope 807 passes through the rope threading hole 809.

In order to adjust the distance that the slider 802 moves, the guide rod 806 is multi-segmented, and the multi-segmented guide rod 806 is connected via a threaded structure.

In order to realize the measurement, the operation steps comprise:

the first step is as follows: the shell 1 is plugged into the pipe to be tested, and the outer end of the supporting rod 801 is contacted with the inner wall of the pipe to be tested by pushing the piston 6;

the second step is that: using a magnetic thickness gauge 2 to directly read the position of the metal coil 805 with the spread inner wall on the outer side of the pipeline to be measured;

the third step: deducing all the feed amounts of the support rods 801 according to the feed amount of the piston 6 rod in the piston 6 so as to obtain the average inner diameter of the pipeline, and measuring the outer diameter through a caliper so as to obtain the average thickness;

The inner wall of the pipeline can be properly cleaned before measurement, and the influence on the accuracy of measurement caused by sundries on the inner wall of the pipeline can be avoided by flushing the inner wall with water flow.

When the invention is used, firstly, because the supporting rods 801 in the device have the flexibility, before the device is used, the supporting rods 801 are in a state of being contracted in the shell 1, see the state shown in the attached figure 2, at this time, the device is small in size and is convenient to be directly placed in the pipeline to be measured. Moreover, the device can be applied to the pipeline to be detected within the set range of the device regardless of the diameter, so that the applicability is enhanced.

Then, since the channel 4 in the housing 1 is connected with the piston 6, by pressing the piston 6, the liquid in the piston 6 enters the chambers 3 through the hose 5 and the channel 4, so that the plurality of support rods 801 in the plurality of chambers 3 move outwards at the same time; until the ends of the support rods 801 are blocked by the inner wall of the pipeline, the plurality of support rods 801 are uniformly stressed, so that the same feeding amount is maintained. When the supporting rod 801 cannot be fed, the position of the piston 6 rod is fixed through a compression bolt 9; the positions of the plurality of support rods 801 are also fixed. The metal coil 805 at the end of the support bar 801 will now contact the inner wall of the pipe.

In the above process, since the outer end of the guide rod 806 extends out of the outer end of the support rod 801, the guide rod 806 will contact with the inner wall of the pipeline, and then the guide rod 806 will contract relative to the support rod 801, that is, the guide rod 806 contracts into the support rod 801, and since the rope 807 is connected between the inner end of the guide rod 806 and the slider 802, the movement of the guide rod 806 will drive the slider 802 to move outwards relative to the support rod 801 through the rope 807; i.e. from the state of fig. 4 to the state of fig. 5; at this time, after the sliding block 802 moves outwards, the supporting rod 804 is connected between the supporting rod 801 and the telescopic rod 803, so that the telescopic rod 803 extends under the action of the supporting rod 804, and the metal coil 805 is unfolded; until finally, the expanded metal roll 805 will fit over the interior of the pipe to be tested.

And according to the different internal diameters of the pipelines, the moving distance of the sliding block 802 can be controlled by adjusting the length of the multi-section guide rod 806, so that the unfolding length of the metal coil 805 can be controlled, and the metal coil can be used for adapting to the pipelines to be tested with different internal diameters.

After the inner wall of the pipeline is attached with a layer of metal, the magnetic thickness gauge 2 can be used for measuring the outer wall of the pipeline by aligning the position of the metal coil 805, and the thickness value can be displayed according to the difference of the thickness of the pipeline and the difference of the magnetism detected by the magnetic thickness gauge 2. By comparing the thicknesses at a plurality of locations, an average of the thicknesses can be calculated.

In addition, since the liquid in the piston 6 is incompressible, the feed amount of the plurality of support rods 801 can be calculated according to the feed amount of the piston 6, and then the average inner diameter can be calculated according to parameters such as the design diameter of the shell 1; and then measuring the outside diameter of the pipeline by a caliper, and calculating the thickness by the difference value of the inside diameter and the outside diameter.

Through the thickness that 2 direct readings of magnetism thickness gauge and calculation, contrast, can be more accurate reachs the thickness value, reduced the operation error.

Claims

1. A PE pipe middle section wall thickness measuring device comprises a cylindrical shell (1) and a magnetic thickness meter (2), and is characterized in that the shell (1) is transversely placed, a plurality of radial cavities (3) are uniformly distributed on the shell (1) in the circumferential direction, a channel (4) is formed in the center of the shell (1), the channel (4) is communicated with the cavities (3), the left end of the channel (4) is connected with a piston (6) through a hose (5), and a first piston (6) is filled with liquid; scale marks (7) are arranged on a piston (6) rod of the piston (6) along the length direction, and a supporting structure (8) is arranged in each chamber (3);

the supporting structure (8) comprises a supporting rod (801) arranged in the cavity (3), a sliding block (802) capable of moving up and down along the supporting rod (801) is mounted on the supporting rod (801), a left transverse telescopic rod (803) and a right transverse telescopic rod (803) are fixed on the sliding block (802), the telescopic rods (803) can actively contract, two supporting rods (804) are connected to the end portion of the supporting rod (801) in an intersecting manner, and the other ends of the two supporting rods (804) are hinged to the two telescopic rods (803) respectively; the end parts of the two telescopic rods (803) are respectively provided with a scroll, and a metal coil (805) is wound on the scroll; the ends of the two metal coils (805) are fixed with the outer end of the support rod (801); the outer end of the supporting rod (801) is provided with a blind hole, a guide rod (806) capable of moving along the length direction of the supporting rod (801) is inserted into the blind hole, and a rope (807) is connected between the inner end of the guide rod (806) and the sliding block (802).

2. The device for measuring the wall thickness of the middle section of the PE pipe as claimed in claim 1, wherein a rubber plug (808) is arranged at the inner end of each supporting rod (801).

3. The PE tube middle section wall thickness measuring device according to claim 1, wherein the metal coil (805) can be automatically coiled under the action of self elasticity.

4. A PE pipe mid-section wall thickness measuring device as claimed in claim 1, characterised in that the piston (6) is fitted with a hold-down bolt (109).

5. The device for measuring the wall thickness of the middle section of the PE pipe as claimed in claim 1, wherein the telescopic rod (803) is composed of an inner core and an outer sleeve, the outer sleeve can move along the inner core, and a tension spring is connected between the outer sleeve and the inner core; the hinged point of the support rod (804) and the telescopic rod (803) is positioned on the outer sleeve of the telescopic rod (803).

6. The device for measuring the wall thickness of the middle section of the PE pipe as claimed in claim 1, wherein the support rod (801) is provided with a rope threading hole (809), and the middle part of the rope (807) passes through the rope threading hole (809).

7. The apparatus as claimed in claim 1, wherein the guide rod (806) is formed in multiple segments, and the multiple segments (806) are connected by a screw structure.

8. A method for a PE pipe midsection wall thickness measuring device according to any of claims 1-7, wherein the operating steps include:

the first step is as follows: the shell (1) is plugged into the pipe to be tested, and the outer end of the supporting rod (801) is contacted with the inner wall of the pipe to be tested by pushing the piston (6);

the second step is that: using a magnetic thickness meter (2) to directly read the position of a metal coil (805) with an inner wall spread at the outer side of the pipeline to be measured;

the third step: deducing all feed amounts of a plurality of support rods (801) according to the feed amount of a piston (6) rod in the piston (6) so as to obtain the average inner diameter of the pipeline, and measuring the outer diameter by a caliper so as to obtain the average thickness;