Automatic test and leak detection device for pressure test of high-pressure valve

Abstract

The invention relates to an automatic test and leak detection device for a high-pressure valve pressure test, which comprises a detection rack, a light shield, a machine vision system and a pressure test system, and is characterized in that the upper end of the detection rack is provided with a hollow table top, a valve to be detected is mounted on the table top at the upper end of the detection rack, and a liquid collector is arranged below the table top of the detection rack; a force detector is arranged at the lower end of the liquid collector, the pressure testing systems are used for being connected and communicated with two connectors of a valve to be tested, the machine vision system is provided with a camera device and a light source, and the camera device and the light source are installed on the side wall of the light shield. The high-pressure valve pressure testing device has the advantages that efficient high-pressure valve pressure testing can be achieved, leakage and leakage detection is conducted through the machine vision system, close-range observation of workers during high-pressure operation can be avoided, manual measurement is not needed, and measurement errors are reduced; and the safety and the accuracy of the pressure test of the high-pressure valve are greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of valve quality inspection in the petroleum industry, and particularly to an automatic test and leak detection device for high-pressure valve pressure tests. Background Art

[0002] During the high-pressure valve pressure test, it is necessary to inspect the leakage of the seals at various parts of the valve during the shell test, and it is necessary to inspect the leakage of the sealing structure during the seal test. However, during the test of high-pressure valves, due to the high pressure (10 Mpa to 100 Mpa), it is dangerous for the staff to observe and measure; and the traditional measuring cylinder measurement method is manual measurement, with low measurement accuracy, and errors caused by the subjective judgment and attention dispersion of the inspectors during the measurement of leakage and drip leakage, resulting in insufficient objectivity when analyzing and judging the test results later; secondly, due to the need for manual visual inspection of drip leakage and leakage, the efficiency of manual measurement is not high, and only one valve can be detected by one person at the same time, which greatly limits the detection efficiency.

[0003] Based on this, it is necessary to develop a device that can efficiently perform high-pressure valve pressure tests. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an automatic test and leak detection device for high-pressure valve pressure tests, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] An automatic test and leak detection device for high-pressure valve pressure tests includes a detection bench, a light-shielding cover, a machine vision system, and a pressure test system. The upper end of the detection bench is provided with a hollowed-out tabletop, and the valve to be tested is installed on the upper tabletop of the detection bench. A liquid collector is provided below the tabletop of the detection bench, and a force detector is provided at the lower end of the liquid collector. The pressure test system is respectively used to connect and communicate with two interfaces of the valve to be tested. The machine vision system has a camera device and a light source, and the camera device and the light source are respectively installed on the side wall of the light-shielding cover.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Further, it further includes a base. One end of the base is provided with a vertical baffle. The light-shielding cover is a cover body with an open lower part and one end. The light-shielding cover is movably installed on the upper end of the base. The light-shielding cover can move along the base to make one end open abut against or separate from the baffle. The detection bench is installed at a position on the upper end of the base close to the baffle.

[0009] Furthermore, two parallel guide rails are provided at positions on the upper end of the base corresponding to both sides of the inspection bench. The guide rails extend towards both ends of the base, and the lower end of the light-shielding cover is in rolling cooperation with the two guide rails through rollers.

[0010] Furthermore, two sets of the above-mentioned camera devices and light sources are respectively provided and assembled on the inner walls of both sides of the light-shielding cover.

[0011] Furthermore, a first sealing groove is provided at the upper end of the base, the lower end of the light-shielding cover extends into the first sealing groove, a second sealing groove adapted to one end of the light-shielding cover is provided at one end of the baffle, and the lower end of the second sealing groove is communicated with the first sealing groove.

[0012] Furthermore, walking wheels are provided at the lower end of the base.

[0013] Furthermore, the above-mentioned pressure test system includes a first main pipe, a second main pipe, two leak detection pipes, a branch pipeline and a pump body. One ends of the first main pipe and the second main pipe are respectively connected to the output end of the pump body. The other ends of the first main pipe and the second main pipe are respectively connected with three-way joints adapted to the interfaces of the valve under test. The two leak detection pipes are respectively connected and communicated with the remaining interfaces of the two three-way joints. The branch pipeline is connected with a pressure monitor and is between the first main pipe and the second main pipe. The first main pipe, the second main pipe and the two leak detection pipes are respectively installed on the inspection bench, and the ports of the two leak detection pipes respectively extend above the liquid collector.

[0014] Furthermore, a first valve and a second valve are respectively provided at one ends of the first main pipe and the second main pipe, a third valve and a fourth valve are provided at both ends of the branch pipeline, and a fifth valve and a sixth valve are respectively provided on the two leak detection pipes.

[0015] Furthermore, the first valve, the second valve, the third valve, the fourth valve, the fifth valve and the sixth valve are all electric valves and are respectively connected to a controller.

[0016] The beneficial effects of the present invention are as follows: It can realize efficient high-pressure valve pressure tests, detect dripping and leakage through a machine vision system, avoid close observation by staff during high-pressure operations, eliminate the need for manual measurement, reduce measurement errors, greatly improve the safety and accuracy of high-pressure valve pressure tests, and solve the problems in the existing detection technology, such as high danger, large measurement errors, low measurement efficiency and the subjective influence of measurement data by operators due to manual measurement. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the automatic test and leak detection device for high-pressure valve pressure tests of the present invention;

[0018] Figure 2 This is the pipeline connection diagram of the pressure test system in the automatic test and leak detection device for high-pressure valve pressure test of the present invention.

[0019] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0020] 1. Detection bench; 2. Light-shielding cover; 4. Camera device; 5. Light source; 6. Base; 11. Liquid collector; 12. Force detector; 31. First main pipe; 32. Second main pipe; 33. Leak detection pipe; 34. Branch pipeline; 35. Pump body; 36. Pressure monitor; 61. Baffle; 311. First valve; 321. Second valve; 331. Fifth valve; 332. Sixth valve; 341. Third valve; 342. Fourth valve. Specific embodiments

[0021] The principles and features of the present invention will be described below with reference to the attached drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0022] Example: As Figure 1 shown, the automatic test and leak detection device for high-pressure valve pressure test in this embodiment includes a detection bench 1, a light-shielding cover 2, a machine vision system, and a pressure test system. The upper end of the above-mentioned detection bench 1 is provided with a hollow tabletop, and the valve to be tested (designated by F in the figure) is installed on the upper tabletop of the above-mentioned detection bench 1. A liquid collector 11 is provided below the tabletop of the above-mentioned detection bench 1, and a force detector 12 is provided at the lower end of the above-mentioned liquid collector 11. The above-mentioned pressure test system is respectively used to connect and communicate with two interfaces of the valve to be tested. The above-mentioned machine vision system has a camera device 4 and a light source 5, and the above-mentioned camera device 4 and light source 5 are respectively installed on the side walls of the above-mentioned light-shielding cover 2.

[0023] In this embodiment, the machine vision system belongs to the existing mature technology. Visual detection by machine replaces manual work and will not be elaborated here.

[0024] When the device is in use, it includes the following steps:

[0025] Connect the two interfaces of the valve to be detected to the pressure test system respectively. Before detection, cover the detection bench 1 with the light-shielding cover 2, turn on the light source 5 and the camera device 4, and connect the pressure test system to the two interfaces of the valve to be tested. The detection is divided into the following three parts:

[0026] 1) The valve is opened, and the pressure test system pressurizes the inside of the valve. The liquid medium passes through two cavities inside the valve to conduct the shell and upper seal test of the valve. This test mainly verifies the shell strength of the valve and the sealing performance of the packing and valve stem parts. At this time, if leakage occurs at this part, the image recognition device collects the signal of the light and dark change caused by the refraction, reflection, and scattering of light due to the seepage of the pressure medium on the surface of the valve to be tested. The terminal computer connected to the machine vision system judges the surface leakage situation of the valve to be tested. At the same time, when too much leakage forms droplets, the droplets obtain a certain relative gravitational potential energy through the height difference between the force detector 12 and the drip point. During the falling process, they obtain sufficient kinetic energy. When the water droplets fall on the liquid collector 11, the force detector 12 generates a force that can be significantly measured, forming a measurement pulse signal, which is recorded and judged and analyzed by the terminal computer;

[0027] 2) For the seal test of one of the valve cavities of the valve, the valve is in the closed state, and the pressure test system pressurizes one of the valve cavities of the valve. If a leak point occurs, the droplets at the leak point obtain a certain relative gravitational potential energy through the height difference between the force detector 12 and the drip point. During the falling process, they obtain sufficient kinetic energy. When the water droplets fall on the liquid collector 11, the force detector 12 generates a force that can be significantly measured, forming a measurement pulse signal, which is recorded and judged and analyzed by the terminal computer.

[0028] 3) For the seal test of the other valve cavity of the valve, the valve is in the closed state, and the pressure test system pressurizes the other valve cavity of the valve. If a leak point occurs, the droplets at the leak point obtain a certain relative gravitational potential energy through the height difference between the force detector 12 and the drip point. During the falling process, they obtain sufficient kinetic energy. When the water droplets fall on the liquid collector 11, the force detector 12 generates a force that can be significantly measured, forming a measurement pulse signal, which is recorded and judged and analyzed by the terminal computer.

[0029] During the whole experimental process, the experimental steps and test time are marked as the abscissa, and the force value sensed by the force detector 12 and the speed value of the light change are recorded as the ordinate. Then, the test results of the valve can be shown through a coordinate graph.

[0030] In this embodiment, the liquid collector 11 can be a tray for collecting water.

[0031] In this embodiment, the force detector 12 can be a conventional force sensor. The specific model is reasonably configured according to the actual use requirements and will not be elaborated here.

[0032] The automatic test and leak detection device for high-pressure valve pressure test in this embodiment can achieve efficient high-pressure valve pressure test. By using a machine vision system to detect dripping and leakage, it can avoid close observation by staff during high-pressure operation, eliminate the need for manual measurement, and reduce measurement errors. It greatly improves the safety and accuracy of high-pressure valve pressure test, and solves the problems in existing detection technologies, such as high danger, large measurement errors, low measurement efficiency, and subjective influence of measurement data by operators. The entire device and detection method are applicable not only to high-pressure valves in the petroleum industry but also to medium- and low-pressure valve pressure tests in other industrial fields, and are suitable for the work of valve production enterprises, quality inspection units, and valve R & D units in aspects such as valve pressure test. During the entire test process, the surface image information of the valve to be tested is collected by the camera device 4, and then intelligent identification is performed on the terminal computer to determine whether there is a leakage or ignition leakage phenomenon. There is no need for manual detection and judgment, which is very intelligent, efficient, and has a relatively high judgment accuracy.

[0033] As a preferred embodiment, it further includes a base 6. One end of the base 6 is provided with a vertical baffle 61. The light-shielding cover 2 is a cover body with openings at the lower part and one end. The light-shielding cover 2 is movably installed at the upper end of the base 6. The light-shielding cover 2 can move along the base 6 to make one end opening abut against or separate from the baffle 61. The test bench 1 is installed at the upper end of the base 6 near the baffle 61.

[0034] In the above implementation, the light-shielding cover 2 can move horizontally along the base 6 to approach and tightly abut against the baffle 61, or move away from the baffle 61 in translation. After tightly abutting against the baffle 61, it completely covers the test bench 1, so that the internal light source 5 and the camera device 4 will not be interfered by the external environmental light when collecting the valve surface image, and the detection is more accurate.

[0035] As a preferred embodiment, two parallel guide rails are provided at the upper end of the base 6 corresponding to the two sides of the test bench 1. The guide rails extend towards the two ends of the base 6. The lower end of the light-shielding cover 2 is in rolling cooperation with the two guide rails through rollers.

[0036] In the above implementation, the cooperation of the two guide rails and the rollers limits the translation trajectory of the light-shielding cover 2, ensuring that the light-shielding cover 2 moves along the correct trajectory to cover the exposed test bench 1.

[0037] As a preferred embodiment, two sets of the camera device 4 and the light source 5 are respectively provided and assembled on the inner walls of the two sides of the light-shielding cover 2.

[0038] In the above embodiments, two groups of light sources 5 respectively emit parallel light that irradiates both sides of the valve to be measured from both sides. A plurality of each group of light sources 5 are arranged at intervals along the extending direction of both ends of the light-shielding cover 2. Ensure that the imaging device 4 can collect the image of the light and dark changes caused by the refraction, reflection and scattering of light generated by the seepage of the pressure medium on the surface of the valve to be measured.

[0039] As a preferred embodiment, a first sealing groove (designated by c in the figure) is provided at the upper end of the base 6. The lower end of the light-shielding cover 2 extends into the first sealing groove. One end of the baffle 61 is provided with a second sealing groove (designated by d in the figure) adapted to one end of the light-shielding cover 2. The lower end of the second sealing groove communicates with the first sealing groove.

[0040] In the above embodiments, the lower end of the light-shielding cover 2 is embedded in the first sealing groove. After the light-shielding cover 2 is translated to completely cover the test bench 1, one end of the light-shielding cover 2 with an open end is embedded in the second sealing groove, ensuring that no external light enters the inside of the light-shielding cover 2 to cause interference, making the experiment smoother and the test results more accurate.

[0041] In this embodiment, traveling wheels are provided at the lower end of the base 6. It can enable the entire device to have the ability to travel, facilitating handling and relocation.

[0042] As a preferred embodiment, as Figure 2 described, the above pressure test system includes a first main pipe 31, a second main pipe 32, two leak detection pipes 33, a branch pipeline 34 and a pump body 35. One ends of the first main pipe 31 and the second main pipe 32 are respectively connected to the output end of the pump body 35. The other ends of the first main pipe 31 and the second main pipe 32 are respectively connected with three-way joints adapted to the interfaces of the valve to be measured. The two leak detection pipes 33 are respectively connected and communicated with the remaining interfaces of the two three-way joints. The branch pipeline 34 is connected with a pressure monitor 36. Between the first main pipe 31 and the second main pipe 32, the first main pipe 31, the second main pipe 32 and the two leak detection pipes 33 are respectively installed on the test bench 1. The ports of the two leak detection pipes 33 respectively extend above the liquid collector 11;

[0043] Among them, a first valve 311 and a second valve 321 are respectively provided at one ends of the first main pipe 31 and the second main pipe 32. A third valve 341 and a fourth valve 342 are provided at both ends of the branch pipeline 34. A fifth valve 331 and a sixth valve 332 are respectively provided on the two leak detection pipes 33.

[0044] In the above embodiments, taking the two valve cavities of the valve to be tested as the a cavity and the b cavity respectively, the other end of the first main pipe 31 is connected to the interface of the a cavity, and the other end of the second main pipe 32 is connected to the interface of the b cavity. Open the second valve 321 and the third valve 341, and the system automatically conducts the shell and upper seal test; open the first valve 311, the third valve 341 and the sixth valve 332 to conduct the seal test of the a cavity (one of the valve cavities) of the valve to be tested; open the second valve 321, the fourth valve 342 and the fifth valve 331 to conduct the seal test of the b cavity (the other valve cavity) of the valve to be tested.

[0045] In this embodiment, the above-mentioned first valve 311, second valve 321, third valve 341, fourth valve 342, fifth valve 331 and sixth valve 332 are all electric valves and are respectively connected to the controller. The valves are switched through the controller to achieve automated operation.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified or limited, a first feature being "on" or "under" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the horizontal height of the first feature is less than that of the second feature.

[0050] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An automatic test and leak detection device for high-pressure valve pressure test, characterized in that: It includes a detection bench (1), a light-shielding cover (2), a machine vision system and a pressure test system. The upper end of the detection bench (1) is provided with a hollow tabletop, and the valve to be tested is installed on the upper tabletop of the detection bench (1). A liquid collector (11) is provided below the tabletop of the detection bench (1), and a force detector (12) is provided at the lower end of the liquid collector (11). The pressure test system is respectively used to connect and communicate with two interfaces of the valve to be tested. The machine vision system has a camera device (4) and a light source (5), and the camera device (4) and the light source (5) are respectively installed on the side walls of the light-shielding cover (2).

2. The automatic test and leak detection device for high-pressure valve pressure test according to claim 1, characterized in that: It further includes a base (6). One end of the base (6) is provided with a vertical baffle (61). The light-shielding cover (2) is a cover body with openings at the lower part and one end. The light-shielding cover (2) is movably installed on the upper end of the base (6). The light-shielding cover (2) can move along the base (6) to make one end opening abut against or separate from the baffle (61). The detection bench (1) is installed at a position on the upper end of the base (6) close to the baffle (61).

3. The automatic test and leak detection device for high-pressure valve pressure test according to claim 2, characterized in that: Two parallel guide rails are provided at positions corresponding to both sides of the detection bench (1) on the upper end of the base (6). The guide rails extend towards both ends of the base (6). The lower end of the light-shielding cover (2) is in rolling cooperation with the two guide rails through rollers.

4. The automatic test and leak detection device for high-pressure valve pressure test according to claim 3, characterized in that: Two groups of the camera device (4) and the light source (5) are respectively provided and assembled on the inner walls of both sides of the light-shielding cover (2).

5. The automatic test and leak detection device for high-pressure valve pressure test according to claim 2, characterized in that: A first sealing groove is provided on the upper end of the base (6). The lower end of the light-shielding cover (2) extends into the first sealing groove. One end of the baffle (61) is provided with a second sealing groove adapted to one end of the light-shielding cover (2), and the lower end of the second sealing groove is communicated with the first sealing groove.

6. The automatic test and leak detection device for high-pressure valve pressure test according to claim 2, characterized in that: Travel wheels are provided at the lower end of the base (6).

7. The automatic test and leak detection device for high-pressure valve pressure test according to claim 1, characterized in that: The pressure test system includes a first main pipe (31), a second main pipe (32), two leak detection pipes (33), a branch pipeline (34) and a pump body (35). One end of the first main pipe (31) and the second main pipe (32) are respectively connected to the output end of the pump body (35). The other ends of the first main pipe (31) and the second main pipe (32) are respectively connected with three-way joints adapted to the interfaces of the valve under test. The two leak detection pipes (33) are respectively and correspondingly connected and communicated with the remaining interfaces of the two three-way joints. The branch pipeline (34) is connected with a pressure monitor (36) between the first main pipe (31) and the second main pipe (32). The first main pipe (31), the second main pipe (32) and the two leak detection pipes (33) are respectively installed on the test bench (1). The ports of the two leak detection pipes (33) respectively extend above the liquid collector (11).

8. An automatic test and leak detection device for high-pressure valve pressure test according to claim 7, characterized in that: One end of the first main pipe (31) and the second main pipe (32) are respectively provided with a first valve (311) and a second valve (321). Both ends of the branch pipeline (34) are provided with a third valve (341) and a fourth valve (342). The two leak detection pipes (33) are respectively provided with a fifth valve (331) and a sixth valve (332).

9. An automatic test and leak detection device for high-pressure valve pressure test according to claim 8, characterized in that: The first valve (311), the second valve (321), the third valve (341), the fourth valve (342), the fifth valve (331) and the sixth valve (332) are all electric valves and are respectively connected to a controller.

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