CN117804704A - A leak detection device for valve processing - Google Patents

Abstract

The invention relates to the technical field of valve detection, in particular to a leakage-proof detection device for valve processing, which comprises: the first telescopic cylinder is fixedly arranged on the base, a first compression plate is fixedly arranged at the end part of a piston rod of the first telescopic cylinder, a positioning column is fixedly arranged on the inner side of the first compression plate, a first external connection pipe is arranged on the outer side of the first compression plate, and the first external connection pipe is communicated with the interior of the valve through the first compression plate; the valve is characterized by comprising a bending mechanism, wherein a second compression plate is arranged on the inner side of the bending mechanism, a positioning column is fixedly arranged on the inner side of the second compression plate, the bending mechanism drives the second compression plate to generate off-axis motion, the valve can bear the force deviating from an axis when the valve is subjected to leakage prevention detection through the arrangement of the bending mechanism, the valve is deformed, the actual use situation that the valve is subjected to off-axis force (force bending the valve) is simulated, and the tightness of the valve under the condition of off-axis force can be effectively detected after the valve is closed.

Description

A leak-proof detection device for valve processing

Technical field

The invention relates to the technical field of valve detection, specifically a leak-proof detection device for valve processing.

Background technique

Valve is a pipeline accessory used to open and close pipelines, control flow direction, adjust and control the parameters of the conveyed medium. It is a control component in the fluid conveying system. It has the functions of cutting off, regulating, diversion, preventing reverse flow, stabilizing pressure, diverting or overflowing. Functions such as flow and pressure relief can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

In the actual process of pipeline valve installation, the laying accuracy of the pipeline is limited due to the need for bending and connecting multiple sections of pipelines. In many cases, the two pipeline ports where the valve needs to be installed are not completely aligned, that is, the pipeline axis has a deviation. Therefore, when installing the valve, the pipeline needs to be forcibly bent into an aligned state to smoothly connect the valve and the pipeline. However, the valve after installation is subjected to a certain eccentric force, causing the valve to deform to a certain extent, and then valve leakage (not tightly closed) occurs. In the factory inspection of the valve, the leakage detection of the valve is only to perform a constant pressure maintenance test after the vertical valve flange squeezes and seals the two ports of the valve. It is difficult to simulate the actual use environment of the valve, resulting in the valve passing the factory inspection, but leakage occurs after the valve is installed on site.

Therefore, a leak-proof detection device for valve processing is now provided, which can realize seal detection of the valve when it is subjected to eccentric force.

Contents of the invention

The object of the present invention is to provide a leak-proof detection device for valve processing to solve the valve detection problems raised in the above background art.

In order to achieve the above object, the present invention provides the following technical solution: a leak-proof detection device for valve processing, including:

The first telescopic cylinder is fixedly installed on the base. The end of the piston rod of the first telescopic cylinder is fixedly installed with a first compression plate. The inner side of the first compression plate is fixedly installed with a positioning post. A first external pipe is provided outside the first compression plate, and the first external pipe is connected to the inside of the valve through the first compression plate;

A bending and twisting mechanism. A second compression plate is provided on the inside of the bending and twisting mechanism. A positioning post is fixedly installed on the inside of the second pressing plate. The bending and twisting mechanism is connected to a second external pipe. The second external pipe is connected to the bending and twisting mechanism. The pipe is connected to the inside of the valve through the second compression plate, and the bending and twisting mechanism drives the second compression plate to produce off-axis motion.

As a preferred embodiment, the bending and twisting mechanism includes a top pressure tube, which is a hollow pipe, a second clamping plate is fixedly installed on one end of the top pressure tube, the interior of the top pressure tube is connected to the interior of the valve through the second clamping plate, a limit plate is fixedly installed on the other end of the top pressure tube, the outer side surface of the limit plate slides against the inner side surface of the limit ring, the inner diameter of the limit ring is smaller than the outer diameter of the limit plate, the limit ring is fixedly installed on the base through a limit bracket, a second external pipe is provided on the outer side of the limit plate, the second external pipe is connected to the interior of the top pressure tube, an eccentric column is rotatably installed on the outer side of the limit plate, the eccentric column is fixedly installed on the inner end surface of the fourth rotor, the axis of the eccentric column is parallel to the axis of the fourth rotor, the axis of the eccentric column and the axis of the fourth rotor have a spacing L, and 0.0mm＜L≤50.0mm, the fourth rotor is driven to rotate around the axis of the fourth rotor by a motor, and the motor is fixedly installed on the base.

As a preferred solution, a support ring is provided in the middle of the pressure pipe. The support ring is sleeved on the pressure pipe. The support ring is installed on the pressure pipe through a rubber ring. The support ring is fixedly installed on the base through a support bracket. .

As a preferred solution, the piston rod of the first telescopic cylinder slides through the sliding hole block, and the sliding hole block is fixedly mounted on the base through a sliding hole bracket.

As a preferred solution, the motor drives the fourth wheel through a transmission mechanism, the transmission mechanism includes a first wheel, the first wheel is fixedly mounted on the motor, the motor is fixedly mounted on a driving bracket, the fourth wheel is rotatably connected to the driving bracket, the first wheel is connected to the fourth wheel through a belt, and the driving bracket is fixedly mounted on the base.

As a preferred solution, the first runner is connected to the fourth runner through a deceleration mechanism. The deceleration mechanism includes a second runner. The second runner is rotatably mounted on the drive bracket. The second runner is coaxial. A third runner is fixedly installed. The diameter of the second runner is larger than the diameter of the third runner. The first runner is connected to the second runner through a belt. The third runner is connected to the fourth wheel through a belt. wheel connection.

As a preferred solution, the first compression plate is connected to the first air valve with a negative pressure tank through a hose. The pressure in the negative pressure tank is negative relative to the internal air pressure on the first compression plate side of the valve. The second The compression plate is connected to a gas tank through a hose and the second air valve. The pressure in the gas tank is positive relative to the internal pressure on the second compression plate side of the valve. The first gas valve and the second gas valve are simultaneously Open.

As a preferred solution, the leakage-proof detection device for valve processing also includes an air surge mechanism. The air surge mechanism includes a piston air tank. One end of the piston air tank is connected to the first compression plate through a hose and communicates with the inside of the valve. , the other end of the piston gas tank is connected to the second compression plate through a hose and communicates with the inside of the valve. An air slide plug is slidably installed inside the piston gas tank. The gas slide plug and the piston gas tank remain sealed. A second telescopic cylinder is provided at one end of the piston gas tank. The sliding seal of the piston rod of the second telescopic cylinder penetrates into the interior of the piston gas tank. The gas slide plug is fixedly installed on the end of the piston rod of the second telescopic cylinder. The second telescopic cylinder drives the air slide plug to move, and the second telescopic cylinder is fixedly installed on the base.

As a preferred solution, the end of the positioning post has threads, and a nut is installed after the valve is installed on the positioning post.

As a preferred solution, locking buckles are respectively provided on the outsides of the first compression plate and the second compression plate. The locking buckles include side blocks, and the side blocks are fixedly installed on the first compression plate and the second compression plate respectively. The outside of the two compression plates partially extends out of the outer edges of the first compression plate and the second compression plate. The extended portion of the side block rotates through the installation connecting column, and the connecting column can slide axially. The connecting column A lock block is fixedly installed on one end, and the other end of the connecting column is rotationally mounted on a horizontal axis. The horizontal axis is eccentrically installed on a circular rotating block. The middle part of the circular rotating block has a gap to accommodate the movement of the connecting column. The side of the circular rotating block The operating handle is fixedly installed, and a rubber pad is provided between the circular rotating block and the side block.

Compared with the prior art, the present invention provides a leak-proof detection device for valve processing. It has the following beneficial effects:

1. Through the setting of the bending and torsion mechanism, the valve can withstand the force off-axis during leakage detection, causing the valve to deform, simulating the real use scenario of the valve being subjected to off-axis force (the force that causes the valve to bend). , can effectively detect the sealing performance of the valve when it is subjected to eccentric force after the valve is closed, and when the valve is subjected to eccentric force, it can amplify some valve shell defects (such as cracks that do not penetrate the valve shell). Able to detect valve defects in time.

2. Through the setting of the air surge mechanism, compared with the traditional constant pressure pressure-maintaining valve leakage detection device, the device of this application can simulate the pressure changes of the flowing medium before and after the valve is closed, so that the valve can withstand fluctuations. Pressure detection is closer to the real use environment.

Description of drawings

Figure 1 is a schematic diagram of the valve installation structure I of this application;

FIG2 is a partial enlarged view of point A in FIG1;

Figure 3 is a schematic structural diagram of the bending and torsion mechanism, transmission mechanism, and deceleration mechanism of this application;

Figure 4 is a schematic diagram II of the valve installation structure in this application;

FIG5 is a schematic diagram of the structure of FIG4 without the driving bracket;

Figure 6 is a schematic diagram of the structure of this application without valves installed;

Figure 7 is a partial enlarged view of B in Figure 6;

Figure 8 is a schematic structural diagram of an embodiment of the rubber ring of the present application;

Figure 9 is a partial enlarged view of C in Figure 6;

Figure 10 is a front view of this application;

Figure 11 is a partial enlarged view of D in Figure 10;

Figure 12 is a schematic structural diagram of the fourth runner and eccentric column of this application;

Figure 13 is a partial cross-sectional view of the air surge mechanism of the present application;

Figure 14 is a schematic diagram I of the locking buckle structure of this application;

Figure 15 is a cross-sectional view of the locking buckle of this application;

Figure 16 is a schematic diagram II of the locking buckle structure of this application;

Figure 17 is a schematic structural diagram of the water enclosure board provided in this application.

In the picture: 1. Base,

2. The first telescopic cylinder,

3. The first compression plate,

4. Positioning column,

5. The first external pipe,

6. Bending and twisting mechanism, 601. Second compression plate, 602. Pressure pipe, 603. Limiting plate, 604. Limiting ring, 6041. Limiting bracket, 605. Eccentric column,

7. The second external connection,

8. Electric motor,

9. Transmission mechanism, 901, first runner, 902, fourth runner,

10. Reduction mechanism, 1001. Second runner, 1002. Third runner,

11. Drive bracket,

12. Sliding hole block, 1201. Sliding hole bracket,

13. Support ring, 1301. Rubber ring, 1302. Support bracket,

14. Air surge mechanism, 1401. Piston air tank, 1402. Second telescopic cylinder, 1403. Air slide plug,

15. Hose,

16. Locking buckle, 1601, side block, 1602, connecting column, 1603, horizontal axis, 1604, circular rotating block, 1605, operating handle, 1606, lock block, 1607, rubber pad,

17. Water enclosure board.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated structure. ; It can be directly connected or indirectly connected through an intermediary. It can be the internal connection between two elements or the interaction between two elements. 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.

It should be noted that in this article, relational terms such as first component, second component, third component, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply There is no such actual relationship or sequence between these entities or operations. Furthermore, the terms "comprises," "comprises," or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

It should be noted that in this article, except for the specific description as shown in the figure, when the inner side, outer side, etc. are directly mentioned in this article, the "inside" refers to the direction close to the valve, and the "outside" refers to the direction away from the valve. direction.

Please refer to Figures 1-17. The present invention provides a technical solution: a leak detection device for valve processing, comprising:

The first embodiment is a leak-proof detection device with a bending and twisting mechanism 6 .

The first telescopic cylinder 2 is fixedly mounted on the base 1. It should be noted that the base 1 can be a workbench. Here, the base 1 can generally refer to a component for installing the leakage detection device of the present application. The piston rod end of the first telescopic cylinder 2 is fixedly mounted with a first clamping plate 3. The first clamping plate 3 clamps and releases the detected valve through the telescopic movement of the first telescopic cylinder 2. Generally, the detection valve has flanges at both ends, and the flanges have through holes for installing bolts. In order to prevent the valve from relatively rotating or sliding after contacting the first clamping plate 3, the first clamping plate 3 is fixedly mounted on the first clamping plate 3. A positioning column 4 is fixedly installed on the inner side of the plate 3. A plurality of positioning columns 4 can be provided. The positioning columns 4 correspond to the positions of the through holes of the valve flange. After the valve is installed, the positioning columns 4 of the first clamping plate 3 are inserted into the through holes of the valve flange. A first external pipe 5 is provided on the outer side of the first clamping plate 3. The first external pipe 5 is communicated with the inside of the valve through the first clamping plate 3. The first clamping plate 3 and the valve are sealed. A sealing ring and/or a sealing sheet and other components can be provided between the first clamping plate 3 and the valve. The first external pipe 5 is used to connect an external gas source to pressurize the inside of the valve.

At present, the detection of valves generally involves squeezing both ends of the valve vertically in the direction of the valve flange to seal both ends of the valve, and then pressurizing the inside of the valve to detect valve leakage. However, during the actual installation process of the valve, the valve The pipes at both ends generally have a certain deviation, that is, the axis of the pipe is deviated. Therefore, after the valve is installed, the valve needs to withstand a certain eccentric force, and the valve is easily deformed. In order to simulate the eccentric force on the valve, the valve will prevent the valve from being deformed. Leakage detection is closer to the actual use environment of the valve, so the anti-leakage detection device settings in this application are:

Bending and twisting mechanism 6. A second compression plate 601 is provided on the inner side of the bending and twisting mechanism 6. A positioning post 4 is fixedly installed on the inner side of the second compression plate 601. The bending and twisting mechanism 6 is connected to a second external pipe. 7. The second external pipe 7 is connected to the inside of the valve through the second compression plate 601, and the second compression plate 601 is sealed with the valve. A seal can be provided between the second compression plate 601 and the valve. Rings and/or seals and other components, the second external pipe 7 is used to connect to an external air source to pressurize the inside of the valve. The bending and twisting mechanism 6 drives the second pressing plate 601 to produce eccentric movement, so that the valve moves in the first Under the action of the second pressing plate 601, it is subjected to the off-axis motion force and undergoes a certain deformation, thereby achieving the purpose of simulating the real use environment of the valve.

In some embodiments, a specific structure of the bending and twisting mechanism 6 is provided. The bending and twisting mechanism 6 includes a pressing tube 602. The pressing tube 602 is a hollow pipe for passing gas. The pressing tube 602 is a hollow pipe for passing gas. A second compression plate 601 is fixedly installed at one end of 602. The inside of the pressure pipe 602 is connected to the inside of the valve through the second compression plate 601. In order for the pressure pipe 602 to withstand the extrusion force from the first compression plate 3, The other end of the pressure pipe 602 is fixedly installed with a limit plate 603. The outer side of the limit plate 603 slides against the inner side of the limit ring 604. The inner diameter of the limit ring 604 is smaller than the outer diameter of the limit plate 603. The limit ring 604 is fixedly installed on the base 1 through the limit bracket 6041. The limit ring 604 limits the movement of the limit plate 603 away from the valve, ensuring that the pressure pipe 602 will not move toward the valve when it receives a force away from the valve. Further, when the limit plate 603 moves off-axis with the pressure pipe 602, the edge of the limit plate 603 is always in contact with the limit ring 604, that is, the limit plate 603 is in contact with the limit ring 604. The limit ring 604 has no gap in the axial direction of the pressure tube 602, which ensures that the circumference of the limit plate 603 is always restricted by the limit ring 604. At this time, the limit plate 603 is connected to the second compression plate 601 through the pressure tube 602. , the pressure pipe 602 has a certain length and can undergo elastic deformation. This also avoids the overly rigid off-axis movement of the valve caused by directly connecting the limit plate 603 when the limit plate 603 moves off-axis. That is, the elastic deformation of the pressure pipe 602 is used. To form a buffer to prevent the valve from being subjected to rigid impact, a second external pipe 7 is provided outside the limit plate 603. The second external pipe 7 is connected to the inside of the pressure pipe 602, so that the limit plate 603 can produce off-axis movement. , an eccentric column 605 is rotatably installed on the outside of the limiting plate 603, and the eccentric column 605 is fixedly installed on the inner end surface of the fourth runner 902. As shown in Figures 11 and 12, the axis of the fourth runner 902 is Y1-Y1, The axis of the eccentric column 605 is Y2-Y2. The axis of the eccentric column 605 is parallel to the axis of the fourth runner 902. There is a distance L between the axis of the eccentric column 605 and the axis of the fourth runner 902, and 0.0mm<L≤ 50.0mm, preferably 0.0mm＜L≤15.0mm, such as 1.0mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10.0mm, 11.0mm, 12.0mm, 13.0mm, 14.0mm, etc., preferably, 5.0mm≤L≤10.0mm. For example, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 8.0mm, 8.5mm, 9.0mm, 9.5mm Etc. If the L value is smaller here, the effect on the off-axis force generated by the valve will not be obvious, and the L value should not be too large. An excessive L value not only requires a larger torque motor 8 to drive, but also the valve is under pressure When the displacement is too large and the eccentric force moves, inelastic deformation of the statue is prone to occur, causing damage to the valve. Controlling L within a certain range, such as 5.0mm≤L≤10.0mm, can not only effectively deviate the valve force, and will not cause damage to the valve, and during the elastic deformation process of the valve, some invisible defects are magnified and displayed during the deformation process of the valve (for example, cracks that do not penetrate the valve shell are completely cracked due to force under elastic deformation. (If air leakage or appearance occurs due to opening), valve defects can be discovered as early as possible. The fourth runner 902 is driven by the motor 8 to rotate around the axis of the fourth runner 902. The motor 8 is fixedly installed on the base 1.

Further, in order to obtain a better rotational connection position between the eccentric column 605 and the limiting plate 603, through experiments:

Take the rotational connection between the eccentric column 605 and the limit plate 603 and set them respectively at: coaxial with the pressure pipe 602, a distance R away from the axis of the pressure pipe 602, a distance 2R away from the axis of the pressure pipe 602, and a distance 2R away from the axis of the pressure pipe 602. The R value is set according to the motion trajectory of the limit plate 603 and the size of the limit ring 604, and finally forms an experimental group in which the eccentric column 605 gradually moves away from the axis of the pressure pipe 602. Each experimental group installs the same valve after , all parameters remain consistent, and each experimental group rotates the fourth wheel 902 with the same number of turns;

The experiment found that the wear at the rotational connection between the eccentric column 605 and the limiting plate 603 is obviously proportional to the distance of the eccentric column 605 from the axis of the pressure pipe 602, and as the distance of the eccentric column 605 from the axis of the pressure pipe 602 increases, the limit There is also local wear between the positioning plate 603 and the limiting ring 604. Therefore, preferably, the axis of the eccentric column 605 is parallel to the axis of the pressing tube 602, and the axis of the eccentric column 605 is parallel to the axis of the pressing tube 602. The distance between the axes is not greater than 100 mm. More preferably, the axis of the eccentric column 605 and the axis of the pressure pipe 602 are arranged in line, that is, the eccentric column 605 and the pressure pipe 602 are coaxial.

Furthermore, the pressure pipe 602 of the leakage-proof detection device of the present application is arranged in the air, that is, the pressure pipe 602 relies on the connection with the eccentric column 605 to maintain its spatial position. Therefore, in order to further increase the number of components supporting the pressure pipe 602, the eccentric column 605 is reduced. The supporting components do not affect the pressure pipe 602. A support ring 13 is provided in the middle of the pressure pipe 602. The support ring 13 is sleeved on the pressure pipe 602. The support ring 13 passes through a rubber ring. 1301 is installed on the top pressure pipe 602. The rubber ring 1301 can be elastically deformed. The top pressure pipe 602 can squeeze the rubber ring 1301 and maintain the required movement after deformation. It should be noted that the elastic deformation of the rubber ring 1301 requires a certain force, but it moves off-axis relative to the valve. The required force is negligible, but the rubber ring 1301 produces a supporting force for the pressure pipe 602, so that the pressure pipe 602 is no longer suspended. More preferably, as shown in Figure 8, the inner ring of the rubber ring 1301 It is a tooth type with gaps between adjacent teeth, so that when the pressing tube 602 is moving, the teeth of the rubber ring 1301 can use the gaps between adjacent teeth to deform more flexibly. The support ring 13 is fixed by the support bracket 1302 Installed on base 1.

In a more preferred embodiment, in order to avoid the impact of the valve on the first telescopic cylinder 2 when it is subject to off-axis movement, the piston rod of the first telescopic cylinder 2 is slid through the sliding hole block 12, and the sliding hole block 12 allows the piston rod to pass through the sliding hole block 12. The axial movement of the piston rod is limited to the vertical axial movement of the piston rod. The sliding hole block 12 is fixedly installed on the base 1 through the sliding hole bracket 1201. The sliding hole block 12 and the sliding hole bracket 1201 effectively prevent the first telescopic cylinder from 2. The fluctuation of the piston rod prevents the first telescopic cylinder 2 from being lost or damaged due to the fluctuation of the piston rod.

Another embodiment: the second embodiment, the bending and twisting mechanism 6 is driven by the transmission mechanism 9:

This embodiment adds a transmission mechanism 9, and the rest of the parts are basically the same as those of the first embodiment, and will not be described in detail.

In order to detect the sealing of the valve, the device of this application needs to be put into the water. In order to prevent the motor 8 from being immersed in the water, the motor 8 drives the fourth runner 902 through the transmission mechanism 9. The transmission mechanism 9 includes the first runner 901, The first runner 901 is fixedly installed on the motor 8, and the motor 8 is fixedly installed on the drive bracket 11. The fourth runner 902 is rotationally connected to the drive bracket 11. The first runner 901 is connected to the fourth wheel through a belt. The runner 902 is connected, and the driving bracket 11 is fixedly installed on the base 1. The alternative solution for the belt here is a chain, and it is better to choose to use a belt drive. The belt is elastic and can soften the impact, reduce vibration, and ensure smooth transmission, especially When driving in water, the belt does not need lubricating oil, and will not rust or pollute the water. It is more preferable that the belt adopts a non-synchronous belt, such as: multi-ribbed belt, V-belt, flat belt, etc., because this The application device does not require a strict transmission ratio, but the non-synchronous belt can slip relative to the runner when the load is too large, and can play the role of a protective device.

In a more preferred embodiment, in order to increase the torque of the electric motor 8 and reduce the rotation speed of the electric motor 8, the first runner 901 is connected to the fourth runner 902 through the reduction mechanism 10. The reduction mechanism 10 includes a second rotating wheel. wheel 1001, the second runner 1001 is rotatably mounted on the driving bracket 11, the second runner 1001 is fixedly mounted with a third runner 1002 coaxially, the diameter of the second runner 1001 is larger than that of the third runner 1002 diameter, the first runner 901 is connected to the second runner 1001 through a belt, and the third runner 1002 is connected to the fourth runner 902 through a belt to realize low-speed and high-torque driving of the fourth runner 902.

Another embodiment: the third embodiment, this device can simulate the pressure change at both ends of the valve when the valve is closed:

Generally, after the valve is closed, a water hammer effect will occur upstream (inflow end). The flowing medium will cause a greater impact on the valve under the action of inertia, so the valve needs to withstand greater upstream pressure, while the downstream (outflow end) of the valve will The flowing medium will continue to swim downstream under the action of inertia, creating a negative pressure on the valve, that is, the pressure downstream of the valve (outflow end) will decrease, thus forming a large pressure difference at both ends of the valve.

First of all, it is explained that the hose 15 in this application can be bent and deformed freely, and can bend and deform as the position of the connecting parts changes, but it will not affect the gas transmission in the hose 15, and the inside of the hose 15 can withstand positive pressure. , can also withstand negative pressure. The hose 15 adopts the conventional existing technology in this field/industry and will not be described again.

The first compression plate 3 is connected to the first air valve (not shown in the figure, a component used to control the communication between gas and the inside of the valve) through the hose 15, and a negative pressure tank (not shown in the figure), The pressure in the negative pressure tank is negative relative to the internal air pressure on the first compression plate 3 side of the valve. The second compression plate 601 is connected to the second air valve (not shown in the figure) through the hose 15 with a gas storage tank (not shown in the figure), the pressure in the gas storage tank is positive relative to the internal pressure on the second pressing plate 601 side of the valve, the first air valve and the second air valve are opened at the same time, and at this time the valve Side 3 of the first compression plate is defined as the outflow end, and side 601 of the second compression plate is defined as the inflow end. When the first air valve and the second air valve are opened at the same time, the pressure at the outflow end of the valve decreases rapidly, while the pressure at the inflow end of the valve decreases rapidly. The pressure increases rapidly, simulating that when the valve is closed, the pressure at the outflow end of the valve decreases and the pressure at the inflow end of the valve increases due to the water hammer effect; conversely, the 3 sides of the first compression plate of the valve are defined as the inflow end, and the second compression plate 601 side is defined as the outflow end, then the first compression plate 3 is connected to a gas tank through a hose 15 and the first air valve, and the second compression plate 601 is connected to a negative pressure tank through the hose 15 and the second air valve. .

The remaining parts of this embodiment may be basically the same as the first embodiment or the second embodiment, and will not be described again.

Yet another embodiment: the fourth embodiment, this device adds an air surge mechanism 14:

This embodiment adds an air surge mechanism 14, and the rest of the parts may be substantially the same as the first embodiment or the second embodiment, and will not be described in detail.

In the third embodiment, the pressure change at both ends of the valve can be simulated only once, and the speed of pressure change within the valve cannot be controlled. That is, the pressure change of the valve closing when the medium in the valve has different flow rates cannot be simulated. The speed of the flowing medium in the valve The faster, the faster the pressure across the valve changes when the valve closes.

Therefore, in this embodiment, the anti-leakage detection device for valve processing also includes an air surge mechanism 14. The air surge mechanism 14 includes a piston air tank 1401. One end of the piston air tank 1401 is connected to the first pipe through a hose 15. The compression plate 3 is connected to the inside of the valve. The hose 15 can be connected to the first compression plate 3 through a three-way valve and the first external pipe 5. The other end of the piston gas tank 1401 is connected to the first compression plate 3 through the hose 15. The second compression plate 601 is connected to the inside of the valve. The hose 15 can be connected to the second compression plate 601 through a three-way valve and the second external pipe 7. An air slide plug 1403 is slidably installed inside the piston gas tank 1401. , the air slide plug 1403 maintains a seal with the piston air tank 1401. The two ends of the piston air tank 1401 connected to the hose 15 are located on both sides of the air slide plug 1403. One end of the piston air tank 1401 is provided with a third The second telescopic cylinder 1402 is used to control the movement of the air slide plug 1403 in the piston air tank 1401. The piston rod sliding seal of the second telescopic cylinder 1402 penetrates into the inside of the piston air tank 1401. The air slide plug 1403 is fixedly installed on The end of the piston rod of the second telescopic cylinder 1402. The second telescopic cylinder 1402 drives the air slide plug 1403 to move. The second telescopic cylinder 1402 is fixedly installed on the base 1. After the inside of the valve is pressurized, the corresponding piston air The tank 1401 also has the same pressure, that is, the pressure on the side of the air slide plug 1403 connected to the first compression plate 3 is the same as the internal pressure on the first compression plate 3 side of the valve, and the air slide plug 1403 is connected to the second compression plate 601 The pressure on one side of the valve is the same as the internal pressure on the second pressure plate 601 side of the valve. At this time, by moving the position of the air slide plug 1403, the gas pressure on one side of the air slide plug 1403 can be increased and the other side of the air slide plug 1403 can be reduced. The gas pressure at both ends of the valve can be adjusted to achieve pressure changes at both ends of the valve, and by controlling the movement speed of the air slide plug 1403 through the second telescopic cylinder 1402, the pressure change speed at both ends of the valve can be controlled, and the pressure change of the valve closing when the medium in the valve has different flow rates can be simulated. speed, and can control the sliding movement of the air slide plug 1403 multiple times through the second telescopic cylinder 1402, and simulate the pressure changes at both ends of the valve when the valve is closed multiple times. Obviously, the air surge mechanism 14 can also simulate the pressure changes at both ends of the valve when the valve is normally closed. The pressure changes of the liquid.

Another embodiment: the fifth embodiment, this device adds a structure for fixing the valve and the first compression plate 3 and the second compression plate 601:

The rest of this embodiment can be basically the same as the first, second, third or fourth embodiment, and will not be described again;

In order to increase the stability of the leakage detection device of the present application when performing leakage detection on the valve, a structure is provided to increase the stability of the valve after installation. The end of the positioning column 4 has a thread. After the positioning column 4 installs the valve, a nut is installed. The nut and the positioning column 4 are threadedly connected to clamp the valve and the first clamping plate 3 and the second clamping plate 601.

In a more preferred embodiment, in order to quickly fix the valve and the first clamping plate 3 and the second clamping plate 601, as shown in Figures 2, 14 to 16, the outer sides of the first clamping plate 3 and the second clamping plate 601 are respectively provided with locking buckles 16, and the locking buckles 16 can be provided in multiple numbers, such as 2, 3, 4, etc., and can be evenly distributed on the first clamping plate 3 and the second clamping plate 601. In some embodiments, in order to facilitate the operation of the locking buckle 16, the locking buckle 16 is arranged on the upper part of the first clamping plate 3 and the second clamping plate 601, and the locking buckle 16 includes a side block 1601, and the side block 1601 are respectively fixedly installed on the outside of the first clamping plate 3 and the second clamping plate 601 and partially extend out of the outer edge of the first clamping plate 3 and the second clamping plate 601. Preferably, the side block 1601 and the first clamping plate 3 and the second clamping plate 601 are an integral structure, for example, they are directly extended from the edges of the first clamping plate 3 and the second clamping plate 601. The extended part of the side block 1601 rotates through the installation connecting column 1602, and the connecting column 1602 can slide axially. One end of the connecting column 1602 is fixedly installed with a locking block 1606, and the other end of the connecting column 1602 is rotatably installed on the horizontal axis 1603 The horizontal axis 1603 is eccentrically mounted on the circular rotating block 1604. The middle of the circular rotating block 1604 has a gap to accommodate the movement of the connecting column 1602. The operating handle 1605 is fixedly mounted on the side of the circular rotating block 1604. When the circular rotating block 1604 is rotated by the operating handle 1605, the horizontal axis 1603 is placed away from the side block 1601. The connecting column 1602 drives the locking block 1606 to move toward the side block 1601. The locking block 1606 presses the valve to keep the valve in close contact with the first clamping plate 3 and the second clamping plate 601. When it needs to be released, the circular rotating block 1605 is rotated by the operating handle 1605. 604, place the horizontal axis 1603 at a position close to the side block 1601, at this time, the connecting rod drives the locking block 1606 to move away from the side block 1601, and the locking block 1606 releases the valve. The locking block 1606 is rotated so that the locking block 1606 does not block the valve from being removed from the first clamping plate 3, the second clamping plate 601 or the positioning column 4. In order to increase the stability of the locking buckle 16 and increase the contact area between the circular rotating block 1604 and the side block 1601, a rubber pad 1607 is provided between the circular rotating block 1604 and the side block 1601, and the rubber pad 1607 can be fixedly installed on the side block 1601.

To sum up, when using the device of the present application, the valves are all in a closed state. When taking and placing the valves, the first pressing plate 3 and the second pressing plate 601 should be kept aligned, that is, the valves do not open in this state. will be subject to an eccentric force. After the valve is installed, the valve is extruded through the first telescopic cylinder 2 and the valve is fixed, and then the eccentric motion of the valve is simulated through the bending and torsion mechanism 6. During the simulation of the eccentric motion of the valve Gas is injected into the valve through the first external pipe 5 and the second external pipe 7 and the pressure is maintained to detect the leak-proof performance of the valve. The gas can also be injected and the pressure is maintained before the valve performs off-axis motion simulation;

For the device of this application, further, a pressure gauge (not shown in the figure) is connected inside the outflow end and the inflow end of the valve. The pressure gauge can be connected to the first external pipe 5 and the second external pipe 7, and then Measure the pressure inside the valve body by inputting gases of different pressures into the inflow end and outflow end of the valve (generally the gas pressure at the inflow end is greater than the gas pressure at the outflow end), and after maintaining the pressure for a period of time, the values of the pressure gauges at both ends of the valve are measured. Change to determine whether there is leakage between the inflow end and outflow end of the valve. If there is no leakage, you can further change the pressure at both ends of the valve, maintain the pressure for a period of time again, observe the values of the pressure gauges at both ends of the valve, and maintain the pressure. When the pressure at both ends of the valve is changed, neither the first external pipe 5 nor the second external pipe 7 is connected to the external air source (except for components such as the air surge mechanism 14 that adjust the pressure change within the valve);

Furthermore, a water enclosure plate 17 is provided outside the device of this application. Water is injected into the water enclosure plate 17 to submerge the valve to be detected. Therefore, after the gas is injected into the valve, it can be directly observed whether there are bubbles discharged from the surface of the valve to determine whether there are bubbles discharged from the valve surface. Is there any leakage in the entire valve?

In some embodiments, the valve leaks during the change of gas pressure, and the pressure gauge cannot effectively monitor it. Therefore, a helium sensor (not shown in the figure) is provided inside the first compression plate 3. The second external pipe 7 is connected to an external helium injection device. The gas pressure injected into the valve by the second external pipe 7 is greater than the gas pressure injected into the valve by the first external pipe 5, and the content of helium in the air is about parts per million. 5.2, so the first external pipe 5 can be injected with ordinary air, but when the helium in the valve connected to the second external pipe 7 leaks to the valve side connected to the first external pipe 5, it will cause helium in the valve connected to the first external pipe 5 The gas content increases rapidly, and the helium sensor can quickly detect the change in helium content and output a signal to the outside world, thereby efficiently and accurately judging the leakage of the valve. When maintaining pressure and changing the pressure at both ends of the valve, the first external pipe 5 and The second external pipe 7 is not connected to the external air source (except for the air surge mechanism 14 and other components that adjust the pressure change in the valve).

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principles and spirit of the invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. Leak protection detection device is used in valve processing, its characterized in that: comprising the following steps:

the telescopic device comprises a first telescopic cylinder (2), wherein the first telescopic cylinder (2) is fixedly arranged on a base (1), a first compression plate (3) is fixedly arranged at the end part of a piston rod of the first telescopic cylinder (2), a positioning column (4) is fixedly arranged at the inner side of the first compression plate (3), a first outer connecting pipe (5) is arranged at the outer side of the first compression plate (3), and the first outer connecting pipe (5) is communicated with the inside of a valve through the first compression plate (3);

the bending mechanism (6), the inboard of bending mechanism (6) is equipped with second pressure strip (601), the inboard fixed mounting reference column (4) of second pressure strip (601), bending mechanism (6) are connected with second outer takeover (7), second outer takeover (7) are switched on with the valve is inside through second pressure strip (601), bending mechanism (6) drive second pressure strip (601) produces the off-axis motion.

2. The leak detection device for valve processing according to claim 1, wherein: the bending and twisting mechanism (6) comprises a jacking pipe (602), the jacking pipe (602) is a hollow pipeline, a second compression plate (601) is fixedly arranged at one end of the jacking pipe (602), the inside of the jacking pipe (602) is communicated with the inside of the valve through a second compression plate (601), a limiting plate (603) is fixedly arranged at the other end of the jacking pipe (602), the outer side surface of the limiting plate (603) is in sliding jacking against the inner side surface of the limiting ring (604), the inner diameter of the limiting ring (604) is smaller than the outer diameter of the limiting plate (603), the limiting ring (604) is fixedly arranged on the base (1) through a limiting bracket (6041), a second outer connecting pipe (7) is arranged at the outer side of the limiting plate (603), the second external connecting pipe (7) is communicated with the inside of the jacking pipe (602), an eccentric column (605) is rotatably arranged on the outer side of the limiting plate (603), the eccentric column (605) is fixedly arranged on the inner end surface of the fourth rotating wheel (902), the axis of the eccentric column (605) is parallel to the axis of the fourth rotating wheel (902), the axis of the eccentric column (605) is spaced from the axis of the fourth rotating wheel (902) by a distance L, and L is more than 0.0mm and less than or equal to 50.0mm, the fourth rotating wheel (902) is driven to rotate around the axis of the fourth rotating wheel (902) by a motor (8), and the motor (8) is fixedly arranged on the base (1).

3. The leak detection device for valve processing according to claim 2, wherein: the middle part of the jacking pipe (602) is provided with a support ring (13), the jacking pipe (602) is sleeved with the support ring (13), the support ring (13) is installed on the jacking pipe (602) through a rubber ring (1301), and the support ring (13) is fixedly installed on the base (1) through a support bracket (1302).

4. A leak detection apparatus for valve manufacturing according to any one of claims 1 to 3, wherein: the piston rod of the first telescopic cylinder (2) penetrates through the sliding hole block (12) in a sliding mode, and the sliding hole block (12) is fixedly installed on the base (1) through the sliding hole bracket (1201).

5. The leak detection device for valve processing according to claim 2, wherein: the motor (8) drives a fourth rotating wheel (902) through a transmission mechanism (9), the transmission mechanism (9) comprises a first rotating wheel (901), the first rotating wheel (901) is fixedly arranged on the motor (8), the motor (8) is fixedly arranged on a driving support (11), the fourth rotating wheel (902) is rotationally connected with the driving support (11), the first rotating wheel (901) is connected with the fourth rotating wheel (902) through a belt, and the driving support (11) is fixedly arranged on a base (1).

6. The leak protection detection device for valve manufacturing according to claim 5, wherein: the first runner (901) is connected with the fourth runner (902) through reducing gear (10), reducing gear (10) include second runner (1001), second runner (1001) rotate install in drive support (11), coaxial fixed mounting third runner (1002) of second runner (1001), the diameter of second runner (1001) is greater than the diameter of third runner (1002), first runner (901) are connected with second runner (1001) through the belt, third runner (1002) are connected with fourth runner (902) through the belt.

7. The leak detection device for valve processing according to claim 1, wherein: the first compression plate (3) is connected with a negative pressure tank through a hose (15) and a first air valve, the internal air pressure of the negative pressure tank is negative pressure relative to the internal air pressure of the side of the first compression plate (3) of the valve, the second compression plate (601) is connected with an air storage tank through the hose (15) and a second air valve, the internal air pressure of the side of the second compression plate (601) of the valve relative to the internal pressure of the air storage tank is positive pressure, and the first air valve and the second air valve are opened simultaneously.

8. The leak detection device for valve processing according to claim 1, wherein: the leak protection detection device for valve processing still includes gas surge mechanism (14), gas surge mechanism (14) include piston gas pitcher (1401), first pressure strip (3) are connected through hose (15) and with the inside switch-on of valve to piston gas pitcher (1401) one end, piston gas pitcher (1401) other end passes through hose (15) and connects second pressure strip (601) and with the inside switch-on of valve, piston gas pitcher (1401) inside slidable mounting gas slide plug (1403), gas slide plug (1403) keep sealed with piston gas pitcher (1401), piston gas pitcher (1401) one end side is equipped with second telescopic cylinder (1402), the piston rod sliding seal of second telescopic cylinder (1402) penetrates the inside of piston gas pitcher (1401), gas slide plug (1403) fixed mounting is in the piston rod tip of second telescopic cylinder (1402), second telescopic cylinder (1402) drive gas slide plug (1403) motion, second telescopic cylinder (1402) fixed mounting is in base (1).

9. The leak detection device for valve processing according to claim 1 or 7, wherein: the end part of the positioning column (4) is provided with threads, and a nut is arranged after the valve is arranged on the positioning column (4).

10. The leak-proof detection device for valve processing according to claim 1 or 8, wherein: the utility model discloses a novel hydraulic cylinder, including first pressure strip (3) and second pressure strip (601), the outside of first pressure strip (3) and second pressure strip (601) is equipped with locking knot (16) respectively, locking knot (16) are including side piece (1601), side piece (1601) are fixed mounting respectively in first pressure strip (3) and second pressure strip (601) outside and part stretches out first pressure strip (3) and second pressure strip (601) outward flange, side piece (1601) stretching out the part and rotate and run through installation even post (1602), just even post (1602) can axial slip, even post (1602) one end fixed mounting locking piece (1606), even post (1602) other end is rotated and is installed in cross axle (1603), cross axle (1603) eccentric mounting is in round rotating piece (1604), round rotating piece (1604) middle part has the clearance that holds even post (1601) motion, round rotating piece (1604) side fixed mounting handle (1605), be equipped with rubber pad (1607) between round rotating piece (1604) and the side piece (1601).