CN105716805B - A blocking detection device - Google Patents

Abstract

The invention discloses a blockage detection device, which comprises a main base, an air supply pump, a blockage cylinder, a compression cylinder, a shaft tube, a limit seat, a joint support frame, a positioning plate is arranged on the compression piston rod, and a head piston There is a drive frame on the pole, a plastic pipe outer end sealing plate, a steel pipe outer end sealing plate, a plastic pipe outer sealing ring, and a steel pipe outer sealing ring on the shaft tube. The shaft tube is provided with a first air inlet. There is a first air intake check valve on the air port, and a first air pressure sensor on the outer wall of the shaft tube. The steel-plastic conversion joint supported by the joint support frame is between the limit seat and the sealing cylinder, and the air supply of the air supply pump The end communicates with the inside of the shaft tube through the air supply tube. The beneficial effects of the present invention are: the overall structure is reasonable, and the positioning and clamping of the steel-plastic conversion joint can ensure the sealing performance without pinching the steel-plastic conversion joint; it has an adaptively adjustable sealing structure, which can strengthen high Sealing effect during air pressure detection.

Description

A blocking detection device

technical field

The invention belongs to the technical field of tightness testing of pipe joints, in particular to a plugging detection device.

Background technique

Steel-plastic conversion joints, also known as PE steel-plastic conversion joints, have been widely used in current production and life. For example, steel-plastic conversion joints are widely used in gas and natural gas transportation pipelines (most of the external gas pipelines are PE Pipes are mostly steel pipes when entering the room, and steel-plastic conversion joints are required during the transfer process). The steel-plastic conversion joint itself consists of a steel pipe section (a section of steel pipe) and a plastic pipe section (usually a section of PE pipe). One end of the steel pipe section is docked with one end of the plastic pipe section to form a connection section. The connection section is usually clamped by one end of the steel pipe section and one end of the plastic pipe section. The connection is formed and sealed with a sealing ring (the connection section is usually provided with some concave-convex structures to cooperate with the clamping, such as the flange on the steel pipe section and the card groove on the plastic pipe section are engaged with each other, and a hoop can also be set outside the connection section. Further tighten), the non-connecting end of the steel pipe section is called the steel pipe end, the non-connecting end of the plastic pipe section is called the plastic pipe end, the plastic pipe end can be welded with the plastic pipe (PE pipe) to be connected, and the steel pipe end can be connected with the steel pipe to be connected Screwed, welded or butt jointed by other structures. Since the steel-plastic conversion joint is used in the field of gas and liquid transmission, its tightness needs to be guaranteed. Before leaving the factory, it must be tested for its tightness.

In the prior art, when the steel-plastic conversion joint is tested, a gasket or a sealing ring is usually placed outside the two ends (steel pipe end and plastic pipe end) of the steel-plastic conversion joint, and at the same time, it is clamped by a force-applying device such as a jack or a hydraulic cylinder. At both ends of the steel-plastic conversion joint, so that the gasket or sealing ring forms a seal with the two ends of the steel-plastic conversion joint, immerse the entire sealed steel-plastic conversion joint in water, and then pass compressed gas into the steel-plastic conversion joint Check its sealing performance.

The above-mentioned test method has the following disadvantages: 1. The operation process is complicated, and the weight of the frame is relatively heavy. It is necessary to immerse the frame in water with the help of external equipment, and the installation of the steel-plastic conversion joint is also relatively troublesome; When the steel-plastic conversion joint is sealed and the sealing ring is placed outside the two ends of the steel-plastic conversion joint, and the hydraulic cylinder (or air cylinder) is used to clamp the two ends of the steel-plastic conversion joint for sealing, the strength of both is difficult to control. If the pressing or clamping force is not enough, the seal at the end of the steel-plastic conversion joint may not be reliable, which will affect the accuracy of the test and cause misjudgment of quality. If the pressing or clamping force is excessive, it may cause The deformation of the steel-plastic conversion joint causes the end face (pipe end) of the steel-plastic conversion joint to be uneven, which makes it impossible to form a seal between the steel-plastic conversion joint and the pressure plate, resulting in misjudgment of quality. Excessive force may also directly damage the steel-plastic conversion joint.

Contents of the invention

In order to overcome the deficiencies in the prior art, the present invention provides a plugging detection device with reasonable overall structure, convenient operation, high accuracy of test results, and can ensure that the two pipe ends of the steel-plastic conversion joint are not easily pinched. .

In order to achieve the above object, the present invention adopts the following technical solutions:

A blockage detection device, including a main base, an air supply pump, a blockage cylinder, a compression cylinder, a limit seat, a horizontal shaft tube with both ends closed, used to support the steel-plastic conversion joint and make the steel-plastic The joint support frame with the conversion joint axis in a horizontal state, the plugging cylinder, the compression cylinder, and the joint support frame are all arranged on the main base. The plugging cylinder includes a head cylinder body, a head cylinder piston, and a head piston rod. , the retractable direction of the head piston rod is horizontal, and the compression cylinder includes a compression cylinder body, a compression cylinder piston, and a compression piston rod, and the telescopic direction of the compression piston rod is vertical. Tighten the positioning plate of the steel-plastic conversion joint. The positioning plate is above the joint support frame. The piston rod of the head is provided with a drive frame for driving the shaft tube to move horizontally along the axis of the shaft tube. The shaft tube is provided with a ring-shaped plastic tube. The outer end sealing plate, the annular steel pipe outer end sealing plate, the plastic pipe outer end sealing plate outer peripheral surface is provided with the plastic pipe outer plate annular groove, the steel pipe outer end sealing plate outer peripheral surface is provided with the steel pipe outer plate annular groove, the plastic pipe The outer end sealing plate, the outer end sealing plate of the steel pipe, the ring groove of the outer plate of the plastic pipe, and the ring groove of the outer plate of the steel pipe are all coaxial with the shaft tube. Sealing ring, the steel pipe outer plate ring groove is provided with a steel pipe outer sealing ring for contacting the inner wall of the steel-plastic conversion joint, the shaft tube is provided with a first air inlet connected to the inside of the shaft pipe, and the first air inlet is provided with a first Air intake one-way valve, the first air intake one-way valve can pass through the direction from the inside of the shaft tube to the outside of the shaft tube. Between the position seat and the blocking cylinder, the air supply end of the air supply pump communicates with the inside of the shaft tube through the air supply pipe. The limit seat is provided with an elastic ring for contacting one end of the steel-plastic conversion joint. The lower surface of the positioning plate is provided with a It is used to contact the rubber pressing pad of the steel-plastic conversion joint.

Preferably, the joint support frame includes a horizontal support base plate, two vertical support vertical plates parallel to each other, a V-shaped support groove for accommodating steel-plastic conversion joints is arranged on the support vertical plate, and the opening of the V-shaped support groove Upward, the lower end of the support vertical plate is fixed to the top surface of the support base plate.

As a preference, the shaft tube is provided with an annular plastic pipe inner end sealing plate and an annular steel pipe inner end sealing plate, the outer peripheral surface of the plastic pipe inner end sealing plate is provided with a ring groove for the inner plate of the plastic pipe, and the outer circumference of the inner end sealing plate of the steel pipe is There is a steel pipe inner plate ring groove on the surface, and the plastic pipe inner plate ring groove is provided with a plastic pipe inner seal ring for contacting the inner wall of the steel-plastic conversion joint, and the steel pipe inner plate ring groove is provided with a steel pipe inner seal for contacting the inner wall of the steel-plastic conversion joint Ring, plastic pipe inner end seal plate, steel pipe inner end seal plate, plastic pipe inner plate ring groove, steel pipe inner plate ring groove are all coaxial with the shaft tube, and the plastic pipe inner end seal plate is located between the steel pipe inner end seal plate and the plastic pipe outer end seal Between the plates, the inner end sealing plate of the steel pipe is located between the inner end sealing plate of the plastic pipe and the outer end sealing plate of the steel pipe. The air inlet, the second air pressure sensor and the third air pressure sensor are arranged on the outer wall of the shaft tube. The air port and the second air pressure sensor are both located between the inner end seal plate of the steel pipe and the inner end seal plate of the plastic pipe, and the third air inlet and the third air pressure sensor are both located between the inner end seal plate of the plastic pipe and the outer end seal plate of the plastic pipe Between, the second air intake is provided with a second air intake one-way valve, the third air intake is provided with a third air intake one-way valve, the passage direction of the second air intake one-way valve, the third air intake one-way valve The passage direction of the valve is from the inside of the shaft tube to the outside of the shaft tube.

As a preference, the outer sealing ring of the steel pipe, the inner sealing ring of the steel pipe, the inner sealing ring of the plastic pipe, and the outer sealing ring of the plastic pipe are all inflatable sealing rings with an inflatable cavity inside. The gas-inflating cavity is connected to the inside of the shaft tube with a steel tube outer ring inflatable tube, and the steel tube inner end sealing plate is provided with a steel tube inner ring gas tube connecting the gas cavity inside the steel tube inner sealing ring with the inside of the shaft tube, and the plastic tube inner end sealing plate is provided with The plastic tube inner ring inflatable tube that connects the inner air cavity of the plastic tube inner sealing ring with the inside of the shaft tube, and the outer end sealing plate of the plastic tube is provided with a plastic tube outer ring inflatable tube that connects the inner air cavity of the plastic tube outer seal ring with the inside of the shaft tube .

As a preference, the shaft tube is provided with a pressure relief hole communicating with the inside of the shaft tube, and the driving frame is connected with the shaft tube through a frictional driving structure. The frictional driving structure includes a push limiter, a pullback limiter, ring, a number of push-pull rods, the push-pull rods are horizontal and one end of the push-pull rod is connected to the drive frame, the other end of the push-pull rod is connected to the friction drive ring, the friction drive ring is set on the shaft tube and coaxial with the shaft tube, the friction drive ring can be placed on the shaft tube Horizontal movement, the inner surface of the friction driven ring is provided with a friction sealing groove, and a friction sealing ring is arranged on the friction sealing groove. The limit body and the pull-back limit body are all outside the shaft tube and are fixed with the shaft tube. The limit seat has a sealing plate limit surface for limiting the outer end sealing plate of the steel pipe. Between the limiting body and the pull-back limiting body, the friction driving ring is between the advancing limiting body and the pulling-back limiting body. When the friction driving ring touches the advancing limiting body, the friction sealing ring seals the pressure relief vent hole ; When the friction drive ring contacts and pulls back the limit body, the friction sealing ring is separated from the pressure relief vent hole.

Preferably, the pushing limiter is annular, the pullback limiter is annular, the advancing limiter is coaxial with the shaft tube, and the pullback limiter is coaxial with the shaft tube.

As a preference, the air supply pipe communicates with the inside of the shaft tube through a self-on-off intake pipe, the air supply end of the air supply pump communicates with one end of the air supply pipe, the other end of the air supply pipe communicates with one end of the self-on-off intake pipe, and the self-on-off intake The other end of the trachea communicates with the inside of the shaft tube. An on-off horizontal plate is provided on the friction drive ring. There is a plate vent hole, when the friction drive ring touches the push limiter, the plate vent hole communicates with the internal channel of the self-opening intake pipe; when the friction drive ring contacts and pulls back the limiter, the on-off horizontal plate will automatically open the intake pipe internal channel partition.

As a preference, external threads are provided on the outer wall of the shaft tube, and the inner ring surface of the inner end sealing plate of the steel pipe and the inner ring surface of the inner end sealing plate of the plastic pipe are connected with the outer thread on the outer wall of the shaft tube through internal threads. There is a first inner inflation port and a second inner inflation port on the top, and both the first inner inflation port and the second inner inflation port are connected with the inside of the shaft tube; The inner end of the first air passage is opened on the inner ring surface of the inner end sealing plate of the steel pipe. One end extends into the first airway from the outer end of the first airway, and the inner wall of the steel pipe inner ring inflatable tube is sealed with the inner wall of the first airway, and the inner end of the first airway is facing the first inner inflation port and is connected to the first airway. The inner inflation port is connected; the inner end sealing plate of the plastic tube is provided with a second air channel, the outer end of the second air channel opens on the outer ring surface of the inner end sealing plate of the plastic tube, and the inner end of the second air channel opens on the inner ring surface of the inner end sealing plate of the plastic tube, One end of the inflatable tube in the inner ring of the plastic tube communicates with the inflatable cavity inside the inner sealing ring of the plastic tube, the other end of the inflatable tube in the inner ring of the plastic tube extends into the first air channel from the outer end of the second air channel, and the outer wall of the inflatable tube in the inner ring of the plastic tube is connected to the second air channel. The inner walls of the air passage are sealed, and the inner end of the second air passage is opposite to the second inner inflation port and communicated with the second inner inflation opening.

As a preference, the steel pipe end of the steel-plastic conversion joint supported by the joint support frame faces the limit seat, the push limit body is between the outer end sealing plate of the plastic pipe and the friction drive ring, and the pull limit body is in the friction position. Between the driving ring and the driving frame.

The beneficial effects of the present invention are: the overall structure is reasonable, and the positioning and clamping of the steel-plastic conversion joint can ensure the sealing performance without pinching the steel-plastic conversion joint; it has an adaptively adjustable sealing structure, which can strengthen high The sealing effect during air pressure detection maintains the stability of the detection process; multiple targeted detections can be carried out at one time, with high efficiency and good effect; with multiple protection structures and linkage control structures, it can avoid various misoperations. problem, and the continuity of action is good, the work efficiency is high, and the detection process is smooth and efficient.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic structural view of a joint support frame of the present invention;

Fig. 3 is an enlarged view of place A in Fig. 1;

Fig. 4 is the enlarged view of place B in Fig. 1;

Figure 5 is an enlarged view at C in Figure 1;

Figure 6 is an enlarged view at D in Figure 1;

Fig. 7 is an enlarged view at E in Fig. 1 .

In the figure: air supply pump 1, air supply pipe 11, sliding frame 12, pump connecting frame 13, support slide rail 14, shaft pipe 2, plastic pipe outer end sealing plate 21, plastic pipe outer sealing ring 211, plastic pipe outer ring inflation pipe 212, steel pipe outer end sealing plate 22, steel pipe outer sealing ring 221, steel pipe outer ring inflation pipe 222, plastic pipe inner end sealing plate 23, plastic pipe inner sealing ring 231, plastic pipe inner ring inflation pipe 232, second airway 23a, steel pipe inner End sealing plate 24, steel pipe inner sealing ring 241, steel pipe inner ring inflation pipe 242, first air passage 24a, first air inlet 2a, second air inlet 2b, third air inlet 2c, pressure relief vent 2d, the first inner inflation port 2e, the second inner inflation port 2f, the limit seat 3, the joint support frame 4, the support bottom plate 41, the support vertical plate 42, the V-shaped support groove 43, the head cylinder 51, the head piston Rod 52, drive frame 53, advance limit body 541, pull back limit body 542, friction drive ring 543, friction sealing ring 5431, push-pull rod 544, compression cylinder 61, compression piston rod 62, positioning plate 63, Rubber pressing pad 631, plastic pipe section 71, steel pipe section 72.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

In the embodiment shown in Figures 1 to 7, a blockage detection device includes a main base, an air supply pump 1, a blockage cylinder, a compression cylinder, a limit seat 3, a cylinder with both ends closed and horizontal Shaft tube 2, a joint support frame 4 for supporting the steel-plastic conversion joint and making the steel-plastic conversion joint axis in a horizontal state, the plugging cylinder, the compression cylinder, and the joint support frame are all arranged on the main base. The plugging cylinder includes a head cylinder body 51, a head cylinder piston that slides and seals with the head cylinder body, and a head piston rod 52 connected to the head cylinder piston. The head piston rod is horizontal and the retractable direction of the head piston rod is Horizontally, the compression cylinder includes a compression cylinder body 61, a compression cylinder piston that is slidably and sealingly matched with the compression cylinder body, a compression piston rod 62 that is connected with the compression cylinder piston, and the compression piston rod is vertical and compresses the piston rod The retractable direction is vertical, and the compression piston rod is provided with a positioning plate 63 for compressing the steel-plastic conversion joint. The positioning plate is located above the joint support frame. To the drive frame 53 that moves horizontally, the shaft tube is provided with an annular plastic pipe outer end sealing plate 21, an annular steel pipe outer end sealing plate 22, and the outer peripheral surface of the plastic pipe outer end sealing plate is provided with a plastic pipe outer plate ring. The outer peripheral surface of the steel pipe outer end seal plate is provided with a steel pipe outer plate ring groove, the plastic pipe outer end seal plate, the steel pipe outer end seal plate, the plastic pipe outer plate ring groove, and the steel pipe outer plate ring groove are all coaxial with the shaft tube. The plastic pipe outer plate ring groove is provided with a plastic pipe outer sealing ring 211 for contacting the inner wall of the steel-plastic conversion joint, and the steel pipe outer plate ring groove is provided with a steel pipe outer sealing ring 221 for contacting the steel-plastic conversion joint inner wall. There is a first air inlet 2a that communicates with the inside of the shaft tube. The first air inlet is provided with a first air intake check valve. The passage direction of the first air intake check valve is from inside the shaft tube to outside the shaft tube. There is a first air pressure sensor on the outer wall of the tube. The steel-plastic conversion joint supported by the joint support frame is between the limit seat and the plugging cylinder. The air supply end of the air supply pump communicates with the inside of the shaft tube through the air supply pipe 11. The limit The seat is provided with an elastic ring for contacting one end of the steel-plastic conversion joint, and the lower surface of the positioning plate is provided with a rubber pressing pad 631 for contacting the steel-plastic conversion joint. The elastic ring is coaxial with the steel-plastic conversion joint, and the elastic ring can be made of rubber or other elastic materials. The connection between the air supply pipe and the inside of the shaft pipe is located between the outer end sealing plate of the plastic pipe and the sealing cylinder. The reading display end of the first air pressure sensor is outside the tested steel-plastic conversion joint. The steel pipe end of the steel-plastic conversion joint supported by the joint support frame faces the limit seat. The air supply pump is arranged on a sliding frame 12, and the air supply pump is connected with the shaft pipe through the pump connecting frame 13. The main base is provided with a support slide rail 14, and the slide frame and the support slide rail are slidably matched, and the slidable direction of the slide frame is horizontal. The supporting slide rail can assist in supporting the air supply pump, driving frame, etc. to prevent excessive load on the piston rod of the head (especially the downward force), and at the same time can provide auxiliary guidance to improve the stability of the working process.

The inner diameters of the steel pipe section 72 and the plastic pipe section 71 of the steel-plastic conversion joint are not necessarily the same. Generally speaking, the inner diameter of the plastic pipe section is slightly larger than the inner diameter of the steel pipe section (there are also special cases where the inner diameter of the steel pipe section is larger than the inner diameter of the plastic pipe section. Here we only take the usual situation as an example. To express, and when the inner diameter of the steel pipe section is larger than the inner diameter of the plastic pipe section, the detection principle is the same). The steel-plastic conversion joint can be placed on the joint support frame (usually the steel pipe section is placed on the joint support frame, or the plastic pipe section is placed on the joint support frame), and one end of the steel-plastic conversion joint (steel pipe end) is placed against the The elastic ring on the limit seat (the end of the steel pipe can only be in contact with the elastic ring. The elastic ring is not a sealing structure, and there is no need to seal the end of the steel pipe. Since the end surface of the steel pipe cannot be guaranteed to be completely flat, compared with rigid contact, the elastic ring is used for transition. It can better guarantee the contact effect, the elastic ring has deformation adaptability, even if the end surface of the steel pipe is uneven, it can fully and fully contact the steel pipe end, and can reduce the risk of extrusion damage to the steel pipe end), press the piston The rod drives the positioning plate to move down, and the rubber pressing pad on the lower surface of the positioning plate contacts the steel-plastic conversion joint and fixes the steel-plastic conversion joint (use the rubber pressing pad to contact the steel-plastic conversion joint to prevent the positioning plate from being damaged and scratched. damage the steel-plastic conversion joint, and the contact and compression effect of the rubber compression pad is better), then the piston rod of the head is stretched out, and the shaft tube and the outer end seal plate of the plastic tube on the shaft tube and the outer end seal of the steel pipe are driven by the drive frame The plates are extended into the steel-plastic conversion joint together, so that the outer sealing plate of the plastic pipe is at the end of the plastic pipe (inside the plastic pipe section), the outer sealing plate of the steel pipe is at the end of the steel pipe (inside the steel pipe section), and the outer sealing plate of the plastic pipe is The plastic pipe end of the steel-plastic conversion joint is sealed by the ring and the outer end sealing plate of the plastic pipe, and the steel pipe end of the steel-plastic conversion joint is sealed by the outer sealing ring of the steel pipe and the outer end sealing plate of the steel pipe. Then, the air supply pump can be used to supply air to the inside of the shaft tube through the air supply pipe, and the gas enters the steel-plastic conversion joint through the first air inlet. After reaching a certain pressure value (the pressure value can be determined according to the gas or liquid pressure in actual use) to set, usually 1 to 8 times the atmospheric pressure), stop the air supply (because the air supply pump usually has a check valve, so the gas in the steel-plastic conversion joint and the shaft tube will not flow back and leak from the air supply pump, If an air supply pump without a one-way valve is used, a one-way valve or an on-off valve needs to be installed at the air supply end of the air supply pump to ensure that the gas in the steel-plastic conversion joint and the shaft tube will not flow back after the gas is stopped). After the air pressure in the steel-plastic adapter under test is basically stable, continue to observe the reading display end of the first air pressure sensor. If the value does not change for a period of time or the value changes within a reasonable range, the air-tightness of the steel-plastic adapter under test is qualified. After the inspection is completed, separate the air supply pump from the air supply pipe (usually a special plastic hose for the cylinder, or a metal bellows, etc.). After the high-pressure gas in the steel-plastic conversion joint and the shaft tube is released, the shaft tube can be pulled out again. .

The joint support frame includes a horizontal support base plate 41, two vertical and mutually parallel support vertical plates 42, the support vertical plate is provided with a V-shaped support groove 43 for accommodating the steel-plastic conversion joint, and the opening of the V-shaped support groove Upward, the lower end of the support vertical plate is fixed to the top surface of the support bottom plate, in a support vertical plate: the V-shaped support groove runs through the two surfaces of the support vertical plate. Use the V-shaped support grooves on the top of the two support vertical plates as the support structure to support and limit the steel-plastic conversion joint under test.

The shaft tube is provided with an annular plastic pipe inner end sealing plate 23 and an annular steel pipe inner end sealing plate 24; The ring groove of the inner plate of the steel pipe is provided on the inner plate of the plastic pipe, and the inner seal ring 231 of the plastic pipe for contacting the inner wall of the steel-plastic conversion joint is arranged on the inner plate ring groove of the plastic pipe. Circle 241, the inner end sealing plate of the plastic pipe, the inner end sealing plate of the steel pipe, the ring groove of the inner plate of the plastic pipe, and the ring groove of the inner plate of the steel pipe are all coaxial with the shaft tube, and the inner end sealing plate of the plastic pipe is located between the inner end sealing plate of the steel pipe and the outer end of the plastic pipe Between the sealing plates, the inner end sealing plate of the steel pipe is located between the inner end sealing plate of the plastic pipe and the outer end sealing plate of the steel pipe. The third air inlet 2c, the second air pressure sensor and the third air pressure sensor are arranged on the outer wall of the shaft tube, the first air inlet and the first air pressure sensor are both located between the outer end sealing plate of the steel pipe and the inner end sealing plate of the steel pipe, Both the second air inlet and the second air pressure sensor are located between the inner end sealing plate of the steel pipe and the inner end sealing plate of the plastic pipe, and the third air inlet and the third air pressure sensor are both located between the inner end sealing plate of the plastic pipe and the outer end of the plastic pipe Between the sealing plates, the second air intake check valve is provided on the second air intake port, and the third air intake check valve is provided on the third air intake port. The passage direction of the air check valve is from the inside of the shaft tube to the outside of the shaft tube. The reading display end of the second air pressure sensor and the reading display end of the third air pressure sensor are all outside the steel-plastic conversion joint under test (the sensing end of the first air pressure sensor is between the outer end sealing plate of the steel pipe and the inner end sealing plate of the steel pipe , the sensing end of the second air pressure sensor is between the inner end sealing plate of the steel pipe and the inner end sealing plate of the plastic pipe, and the sensing end of the third air pressure sensor is between the inner end sealing plate of the plastic pipe and the outer end sealing plate of the plastic pipe). The inner end sealing plate of the plastic pipe and the inner end sealing plate of the steel pipe are added (same as the outer end sealing plate of the plastic pipe and the outer end sealing plate of the steel pipe, which extend into the steel-plastic conversion joint along with the shaft tube), so that “three Section detection", which are steel pipe section, plastic pipe section and connection section (the butt joint section of steel pipe section and plastic pipe section). An airtight chamber for detecting the connection section is formed between the sealing plate and the inner end sealing plate of the plastic pipe, and an airtight chamber for detecting the plastic pipe section is formed between the inner end sealing plate of the plastic pipe and the outer end sealing plate of the plastic pipe, and the air supply pump passes through the first air inlet , the second air inlet, and the third air inlet simultaneously inflate each section of the airtight cavity, and the first air pressure sensor, the second air pressure sensor, and the third air pressure sensor can simultaneously detect the air pressure of each section, so that it can be quickly and effectively Find out whether there are cracks and leaks, and which section is the specific leaking part.

The outer sealing ring of the steel pipe, the inner sealing ring of the steel pipe, the inner sealing ring of the plastic pipe, and the outer sealing ring of the plastic pipe are all inflatable sealing rings with an inflatable cavity inside. The steel pipe outer ring gas tube 222 connected inside the shaft tube, the steel tube inner ring gas tube 242 connecting the inner gas chamber of the steel tube inner seal ring with the inside of the shaft tube is provided on the inner end sealing plate of the steel tube, and the inner end sealing plate of the plastic tube is provided with the The plastic tube inner ring inflatable tube 232 that connects the inner ring cavity of the plastic tube inner seal ring with the inside of the shaft tube, and the outer end sealing plate of the plastic tube is provided with a plastic tube outer ring inflatable tube that connects the inner ring cavity of the plastic tube outer seal ring with the inside of the shaft tube 212. Further, in this solution, the steel pipe outer sealing ring, the steel pipe inner sealing ring, the plastic pipe inner sealing ring, and the plastic pipe outer sealing ring are all inflatable sealing rings, so that their sealing properties can be adjusted. When the above-mentioned sealing rings are ordinary sealing rings (such as rubber solid sealing rings), in order to ensure the airtight effect during testing, the sealing rings need to be tightly pressed against the inner wall of the steel-plastic conversion joint, which causes the sealing rings to When entering the steel-plastic conversion joint, the friction is extremely high, which can easily lead to difficulty in entering and rapid wear and tear. In this solution, before testing, the above-mentioned sealing rings are not inflated, so that the shaft tube, each sealing plate, and each sealing ring can be smoothly inserted into the steel-plastic conversion joint. For gas supply, the gas not only enters the sealing cavity of each section, but also enters the outer sealing ring of the steel pipe through the inflation pipe of the outer ring of the steel pipe, enters the inner sealing ring of the steel pipe through the inflation pipe of the inner ring of the steel pipe, and enters the inner ring of the steel pipe through the inflation pipe of the inner ring of the plastic pipe. The sealing ring in the pipe enters the outer sealing ring of the plastic pipe through the inflatable pipe of the outer ring of the plastic pipe to form a seal in each section. Moreover, the greater the pressure in the airtight cavity of each section, the greater the pressure in each sealing ring, so it has the ability to detect the air pressure and sealing ability of self-adaptive adjustment, which can effectively prevent insufficient sealing or excessive sealing. When the test is completed and the pressure in the steel-plastic conversion joint and the shaft tube is released, the high-pressure gas in each sealing ring will be released. After the pressure is released, there is no or very little friction between the sealing rings and the steel-plastic conversion joint. Let the shaft tube and each sealing plate on the shaft tube get away from the steel-plastic conversion joint. After adopting the form of inflatable sealing ring, when observing the readings of the air pressure sensor in the "three-stage detection" (steel pipe section, plastic pipe section, and connecting section), which section of the air pressure sensor has a significant pressure drop first (beyond the reasonable range), it means Which section has air leaks, cracks or sealing defects.

The shaft tube is provided with a pressure relief vent 2d communicating with the inside of the shaft tube, and the drive frame is connected to the shaft tube through a friction-driven structure, which includes a push limiter 541, a pull-back limiter 542, a friction drive Ring 543, some push-pull rods 544, the push-pull rods are horizontal and one end of the push-pull rods is connected with the drive frame, the other end of the push-pull rods is connected with the friction drive ring, the friction drive ring is sleeved on the shaft tube and coaxial with the shaft tube, the friction drive ring can be placed on the shaft The tube moves horizontally, and the inner ring surface of the friction driven ring is provided with a friction seal groove, and a friction seal ring 5431 is arranged on the friction seal groove. The friction seal ring is coaxial with the shaft tube, and the friction seal ring and the outer wall of the shaft tube squeeze each other Pushing the limit body and pulling back the limit body are all outside the shaft tube and fixed with the shaft tube. The limit seat has a sealing plate limit surface for limiting the outer end sealing plate of the steel pipe, and the outer end sealing plate of the steel pipe The horizontal distance from the limit seat is less than or equal to the horizontal distance between the outer end sealing plate of the steel pipe and the shaft tube, the pressure relief vent is between the push limit body and the pull back limit body, and the friction drive ring is at the push limit position Between the body and the pull back limit body, when the friction drive ring contacts the push limit body, the friction seal ring seals the pressure relief vent hole; when the friction drive ring contacts the pull back limit body, the friction seal ring and the pressure relief exhaust Hole separation. The pushing limiter is ring-shaped, the pull-back limiter is ring-shaped, the advancing limiter is coaxial with the shaft tube, and the pull-back limiter is coaxial with the shaft tube. The advancing limiting body is located between the outer end sealing plate of the plastic pipe and the friction driving ring, and the pulling back limiting body is located between the friction driving ring and the driving frame.

This scheme can realize pressurization protection and automatic pressure release. When testing is required, the piston rod of the head is stretched out, and the friction is driven by the drive frame and the push-pull rod to drive the ring sleeve to move. Due to friction, there is a friction seal ring between the ring sleeve and the shaft tube, and the friction seal ring and the outside of the shaft tube The walls are extruded and rubbed against each other, so at this time, the friction drives the ring sleeve to directly drive the shaft tube to move through the friction seal ring, so that the shaft tube and each sealing plate can enter the steel-plastic conversion joint, and when the outer end of the steel pipe is in contact with the limit After the limit surface of the sealing plate on the seat, the shaft tube is positioned and cannot continue to move forward, while the friction drive ring will continue to be pushed forward until it touches the limit body, and the head cylinder stops working (at this time, the pressure relief vent is closed. friction seal). In this solution, only when the overall insertion and positioning of the shaft tube and each sealing plate is completed, the pressure relief vent hole will be sealed by the friction sealing ring, and the shaft tube and each sealing ring can be smoothly inflated and maintained. , so that it can be detected. After the inspection is completed, the head piston rod is retracted directly. Since the sealing rings are in an expanded state at this time, they are tightly attached to the steel-plastic conversion joints, so the shaft tube and the sealing plates cannot move, and the head piston rod The friction driving ring can only be pulled back through the driving frame and the push-pull rod until the friction driving ring touches and pulls back the limit body. The gas will be discharged. After the gas in each sealing ring is discharged, the sealing effect will disappear, and the gas in the steel-plastic conversion joint (that is, in the three sealing sections) will also be discharged (at this time, there is no tightness between each sealing ring and the steel-plastic conversion joint. close to each other), so that as the piston rod of the head continues to be retracted, the shaft tube and the sealing plates will also be pulled out together and separated from the steel-plastic conversion joint. The above process eliminates all redundant pressure relief actions (such as the separation and docking operation of the air supply pipe and the air supply pump), and realizes the action of releasing the pressure first and then pulling out the shaft tube with a delay. The whole process is reasonable, coherent and efficient. .

The outer wall of the shaft tube is provided with external threads, and the inner ring surface of the inner end sealing plate of the steel pipe and the inner ring surface of the inner end sealing plate of the plastic pipe are connected with the outer thread on the outer wall of the shaft tube through internal threads. The first inner charging port 2e, the second inner charging port 2f, the first inner charging port and the second inner charging port are all communicated with the inside of the shaft tube; The inner end of the first air passage is opened on the inner ring surface of the inner end sealing plate of the steel pipe. One end extends into the first airway from the outer end of the first airway, and the inner wall of the steel pipe inner ring inflatable tube is sealed with the inner wall of the first airway, and the inner end of the first airway is facing the first inner inflation port and is connected to the first airway. The inner inflation port is connected; the inner end sealing plate of the plastic tube is provided with a second air channel 23a, the outer end of the second air channel opens on the outer ring surface of the inner end sealing plate of the plastic tube, and the inner end of the second air channel opens on the inner ring surface of the inner end sealing plate of the plastic tube One end of the plastic tube inner ring inflatable tube communicates with the inner air cavity of the plastic tube inner sealing ring; The inner walls of the air passage are sealed, and the inner end of the second air passage is opposite to the second inner inflation port and communicated with the second inner inflation port. The inner sealing ring of the steel pipe is fixed on the ring groove of the inner plate of the steel pipe, and the inner sealing ring of the plastic pipe is fixed on the ring groove of the inner plate of the plastic pipe. With the segment detection function, the overall inspection inside the steel-plastic conversion joint can still be carried out. Before the overall leak detection of the steel-plastic conversion joint is required, it is only necessary to rotate the inner end sealing plate of the steel pipe and the inner end sealing plate of the plastic pipe. Let the inner end of the first airway be misaligned and disconnected from the first inner inflation port, and let the inner end of the second airway be misaligned and disconnected from the second inner inflation port. In this way, when inflating, maintaining pressure, and testing, Only the outer sealing ring of the steel pipe and the outer sealing ring of the plastic pipe play a sealing role, so that the overall tightness test inside the steel-plastic conversion joint can be realized (the rest of the steps are the same as the segmental test). After the overall inspection is completed, if it is necessary to carry out subsection inspection, first rotate the inner end sealing plate of the steel pipe and the inner end sealing plate of the plastic pipe to reset the inner end sealing plate of the steel pipe and the inner end sealing plate of the plastic pipe, and then carry out the subsection inspection again.

In addition, there is a very small probability that the following situation will occur: the leakage position on the steel-plastic conversion joint is just blocked by the joint support frame, positioning plate and other detection and positioning structures, resulting in no air leakage detected at these leakage positions during detection. In view of this, if you want to further improve the accuracy of the test results, you can turn the steel-plastic conversion joint on the joint support frame along the axis of the steel-plastic conversion joint by an angle, such as 20 degrees, after one test is completed. The position where the support frame, positioning plate or the structure used to contact the steel-plastic conversion joint on the positioning plate, etc. touch the steel-plastic conversion joint again will be different from the previous contact position. Combining the two test results, it can be concluded that the steel-plastic conversion joint The conclusion of whether the sealing of the conversion joint is qualified.

Claims (4)

1. a kind of closure detection device, including main engine bed, air feed pump, characterized in that further include blocking cylinder, compression cylinder, limit Position seat, one closed at both ends and horizontal central siphon, is used to support steel modeling crossover sub and steel modeling crossover sub axis is made to be in water The connection supports frame of level state blocks cylinder, compression cylinder, connection supports frame and is arranged on main engine bed, the closure cylinder Including end socket cylinder body, end socket the cylinder piston, end socket piston rod, the scalable direction of end socket piston rod is horizontal, and compression cylinder includes pressure Tight cylinder body compresses the cylinder piston, clamping piston bar, and the scalable direction of clamping piston bar is vertical, and clamping piston bar is equipped with and is used for The positioning plate of steel modeling crossover sub is compressed, positioning plate is in above connection supports frame, and end socket piston rod is equipped with for band moving axis The band moving frame that pipe is axially moved horizontally along central siphon, central siphon are equipped with cricoid modeling and manage the outer end-plate of outer end-plate, cricoid steel pipe, Modeling manages outer end-plate peripheral surface and is equipped with modeling pipe outside plate annular groove, and the outer end-plate peripheral surface of steel pipe is equipped with steel pipe outside plate annular groove, modeling The outer end-plate of the outer end-plate of pipe, steel pipe, modeling pipe outside plate annular groove, steel pipe outside plate annular groove are coaxial with central siphon, mould on pipe outside plate annular groove Equipped with the modeling pipe exterior seal ring for moulding crossover sub inner wall for contacting steel, steel pipe outside plate annular groove is equipped with for contacting steel modeling conversion The steel pipe exterior seal ring of inner nosepiece wall, central siphon are equipped with the first air inlet being connected to central siphon inside, and the first air inlet is equipped with First breather check valve, the first breather check valve can be by outside central siphon, central siphon outer wall is equipped with the in central siphon by direction One baroceptor, between the steel modeling crossover sub that connection supports frame is supported is in limit base and blocks cylinder, air feed pump By being connected to inside air supply pipe and central siphon, limit base is equipped with the elastic ring for contacting steel modeling crossover sub one end at gas supply end, The positioning plate lower surface is equipped with the rubber clamping pad that crossover sub is moulded for contacting steel；

The central siphon is equipped with cricoid modeling pipe inner end sealing plate, cricoid steel pipe inner end sealing plate, moulds on the sealing plate peripheral surface of pipe inner end Equipped with modeling pipe inner panel annular groove, steel pipe inner end sealing plate peripheral surface is equipped with steel pipe inner panel annular groove, and modeling pipe inner panel annular groove, which is equipped with, to be used for The modeling pipe inner seal ring of steel modeling crossover sub inner wall is contacted, steel pipe inner panel annular groove is equipped with moulds crossover sub inner wall for contacting steel Steel pipe inner seal ring, modeling pipe inner end sealing plate, steel pipe inner end sealing plate, modeling pipe inner panel annular groove, steel pipe inner panel annular groove are same with central siphon Axis, modeling pipe inner end sealing plate are between steel pipe inner end sealing plate and the outer end-plate of modeling pipe, and steel pipe inner end sealing plate is in modeling pipe inner end seals Between the outer end-plate of plate and steel pipe, central siphon is equipped with the be connected to the second air inlet be connected to inside central siphon, with central siphon inside Three air inlets, central siphon outer wall are equipped with the second baroceptor, third baroceptor, the first air inlet and the first air pressure sensing Device is in outside steel pipe between end-plate and steel pipe inner end sealing plate, and the second air inlet and the second baroceptor are in steel pipe Between end-plate and modeling pipe inner end sealing plate, third air inlet is in modeling pipe inner end sealing plate with third baroceptor and modeling pipe is outer Between end-plate, the second air inlet be equipped with the second breather check valve, third air inlet be equipped with third breather check valve, second Breather check valve can by direction, third breather check valve can be by direction by central siphon to outside central siphon；

The steel pipe exterior seal ring, steel pipe inner seal ring, modeling pipe inner seal ring, modeling pipe exterior seal ring are internal with inflatable chamber Gas-flow closure circle, the outer end-plate of steel pipe is equipped with outside the steel pipe for being connected to steel pipe exterior seal ring inner inflatable chamber with central siphon inside Gas tube is enclosed, steel pipe inner end sealing plate, which is equipped with, fills the steel pipe inner ring being connected to inside steel pipe inner seal ring inner inflatable chamber and central siphon Tracheae, modeling pipe inner end sealing plate are equipped with the modeling pipe inner ring that will be moulded and be connected to inside pipe inner seal ring inner inflatable chamber and central siphon and inflate Pipe, modeling manage outer end-plate and are equipped with the modeling pipe outer ring gas tube that will be moulded and be connected to inside pipe exterior seal ring inner inflatable chamber and central siphon；

The central siphon is equipped with the pressure release gas vent being connected to central siphon inside, and band moving frame is connected with central siphon by the driving structure that rubs It connects, friction driving structure includes promoting limit body, retracting limit body, friction band rotating ring, several push-pull rods, and push-pull rod is horizontal and pushes away Pull rod one end connect band moving frame, push-pull rod other end connection friction band rotating ring, friction band moving ring sleeve is located on central siphon and and central siphon Coaxially, friction band rotating ring can move horizontally on central siphon, and friction band rotating ring inner ring surface is equipped with friction sealed slot, friction sealed slot It is equipped with drag seal, drag seal is coaxial with central siphon, is squeezed mutually between drag seal and central siphon lateral wall, promotes Limit body retracts limit body and is in that central siphon is outer and fixed with central siphon, and limit base has for limiting end-plate outside steel pipe Sealing plate confined planes, between pressure release gas vent is in propulsion limit body and retracts limit body, friction band rotating ring is in propulsion limit body Between retracting limit body, when friction band rotating ring contact promotes limit body, drag seal seals pressure release gas vent；Friction drives When ring contact retracts limit body, drag seal is detached with pressure release gas vent；

The central siphon lateral wall is equipped with external screw thread, and steel pipe inner end sealing plate inner ring surface, modeling pipe inner end sealing plate inner ring surface pass through interior External screw thread on screw thread and central siphon lateral wall is connected, and central siphon is equipped with inflating port in first, inflating port in second, in first Inflating port, in second inflating port be connected to inside central siphon；The first air flue is equipped in the sealing plate of steel pipe inner end, the first air flue outer end is opened For mouth in steel pipe inner end sealing plate outer ring surface, the first air flue inner end is opened on steel pipe inner end sealing plate inner ring surface, steel pipe inner ring gas tube one End is connected to steel pipe inner seal ring inner inflatable chamber, the steel pipe inner ring gas tube other end stretches into the first air flue from the first air flue outer end It is interior, it seals between steel pipe inner ring gas tube outer tube wall and the air flue inner wall of the first air flue, is filled in the first air flue inner end face first It gas port and is connected to inflating port in first；It moulds and is equipped with the second air flue in the sealing plate of pipe inner end, the second air flue outer end opening is in modeling pipe End-plate outer ring surface, the second air flue inner end are opened on modeling pipe inner end sealing plate inner ring surface, mould pipe inner ring gas tube one end and mould in pipe The connection of sealing ring inner inflatable chamber, the modeling pipe inner ring gas tube other end are stretched into from the second air flue outer end in the first air flue, are moulded in pipe It is sealed between circle gas tube outer tube wall and the air flue inner wall of the second air flue, inflating port and with the in the second air flue inner end face second Inflating port is connected in two.

2. a kind of closure detection device according to claim 1, characterized in that the connection supports frame includes horizontal branch Bottom plate, two vertical and parallel to each other supporting vertical plates are supportted, supporting vertical plate is equipped with the V-arrangement branch that crossover sub is moulded for accommodating steel Support slot, V-arrangement support slot it is opening up, supporting vertical plate lower end is fixed with support baseboard top surface.

3. a kind of closure detection device according to claim 1, characterized in that the propulsion limit body is annular in shape, described It is annular in shape to retract limit body, promotes limit body coaxial with central siphon, it is coaxial with central siphon to retract limit body.

4. a kind of closure detection device according to claim 1 or 3, characterized in that the connection supports frame was supported Steel moulds the steel pipe end of crossover sub towards limit base, promotes limit body to be in modeling and manages between outer end-plate and friction band rotating ring, draws It returns limit body and is in friction band rotating ring and between moving frame.