CN106424032B - A kind of wiper with dead-man's device - Google Patents

Abstract

The invention relates to a pipe pig with an automatic brake device, which is used for pipe pigging operation and overcomes the disadvantage of poor passability in the pipe of the existing speed-regulating pipe pig. Its technical scheme: leather cups are arranged at both ends of the cylinder, one end of the connecting rod B is hinged to the brake pad and the other end is hinged to the cylinder, one end of the connecting rod C is hinged to the brake pad and the other end passes through the groove hole of the cylinder and is hinged to the center. on the shaft; a brake cylinder is installed in the cylinder, and the piston rod of the brake cylinder is connected to the spindle; the input shaft of the hydraulic pump is installed with rollers, and a support spring is arranged between the two hydraulic pumps. The hydraulic pump is arranged at the rear end of the cylinder; the oil tank is arranged at In the barrel, the oil suction port of the hydraulic pump is connected to the fuel tank, the oil outlet port of the hydraulic pump is connected to the throttle valve, the oil return port of the throttle valve is connected to the fuel tank, and the front end of the throttle valve is connected to the brake cylinder. The pig speed controller of the invention has no electrical components, is safe and reliable; and the device has strong passability in the pipeline.

Description

A pipe cleaner with automatic braking device

technical field

The invention relates to a pipe pig with an automatic braking device, which is used for pipe pigging operations.

Background technique

In the process of pigging and testing oil and gas pipelines, general regulations require that the running speed of the pigging equipment is 3.5-5m/s; in order to obtain better quality of testing data, the running speed of the equipment in the pipeline is required to be lower than 5 m/s. s; electromagnetic ultrasonic testing equipment requires its operating speed to be lower than 2 m/s. The speed of the pigs changes greatly when passing through the uphill and downhill sections, curved sections, liquid accumulation, sand accumulation and fouling sections of the pipeline, and the direct use of conventional pigs cannot meet the speed control requirements.

The speed control modes of existing oil and gas pipeline pigs are active control mode and passive control mode.

The active control adopts the bypass valve control method, and its technical solution is: use the mileage wheel to collect the pig speed or use the acceleration sensor to obtain the pig speed; the electronic control system processes the signal; adjust the opening degree of the discharge valve through the motor; Then adjust the pressure difference between the front and rear of the pig through the opening of the relief valve, and adjust the driving force of the pig to control the running speed of the pig.

The passive control method is to indirectly control the speed of the pig by adjusting the medium pressure and flow at the inlet and outlet ports during the pigging operation. Because of the compressibility of the gas, it is often difficult to achieve a good speed control effect by the passive control method, and the pig is prone to impact due to excessive speed, causing problems such as damage to the pig and the pipeline.

Patent CN201410219086.7 discloses an automatic speed-regulating pig. This scheme uses a half-cross belt drive. The belt is easy to deviate and slip under complex working conditions in the pipeline, and the speed acquisition wheel of this scheme is realized by spring tension and a support rod. , the overall layout length is long, and it is difficult to meet the requirements of the pig passing through the pipe elbow.

Patent CN201410225525.5 discloses a speed acquisition device for pipe pigs. The solution adopts the method of driving the hydraulic pump by the speed acquisition wheel, and presses the velocity acquisition wheel against the inner wall of the pipeline with tension springs and struts. Therefore, if this solution is applied to the pig, the overall length of the pig will be relatively long, which is not conducive to the device passing through the elbow.

Patent CN 201410708220.X discloses a pig speed controller with a hydraulic system, which converts the speed of the pig into the rotation of the central mass through the hydraulic system, and the centrifugal force generated by the rotation of the mass squeezes the brake pads force. The scheme is complex in structure and low in feasibility.

Patent CN 201610134623.7 discloses a speed-regulating pipe pig with a rotary bypass valve. The speed acquisition wheel of this scheme is arranged radially, and it is easy to get stuck when passing through the tee part of the pipeline.

Patent CN 201610015859.9 discloses a hydraulically controlled brake device for pipe pigs. This solution collects the running speed of the pipe pig through the hydraulic system and generates a control resistance related to the speed. Patent CN 201610013135.0 discloses a pig brake device, which uses a hydraulic system to collect the running speed of the pig and generates control force through the rotation of the mass block. In the above two solutions, the brake pads continuously rub against the pipeline and are used in series with conventional pigs, which increases the complexity of the whole set of equipment.

Patent CN 201610013358.7 discloses a bypass valve-type speed-regulating pig. In this scheme, the speed collection wheel is set in the middle of the pig, and the axial sliding bypass valve is set in the middle of the cylinder. The layout makes the middle throttle valve pass Small; at the same time, the radially arranged speed acquisition wheel is easy to get stuck at the tee.

The current active control method controls the power consumption of the motor, and the battery power of the pig is limited, so long-distance pipeline pigging is limited. On the other hand, the electronically controlled bypass valve control scheme becomes complicated due to the consideration of many factors such as the medium in the pipe and the shape of the pipe. Domestic bypass valve active control pigs are still immature, and overseas such pigs are expensive to rent. At present, domestic oil and gas pipeline pigging is still dominated by passive control methods. Therefore, it is of great significance and application prospect to develop an automatic speed-regulating pig that is applicable to a wider range of working conditions.

Contents of the invention

Purpose of the present invention: In order to overcome the shortcomings of the current pig bypass valve discharge control method, and to overcome the shortcomings of the existing speed-regulating pig pipeline, a pig with an automatic brake device is provided. tube.

For achieving the above object, the technical scheme that the present invention takes is:

A pipe pig with an automatic brake device, including a roller, a hydraulic pump, a rear end cover, a leather cup, a brake pad, a connecting rod B, a connecting rod C, a cylinder body, a front end cover, a mandrel, a brake cylinder, an oil tank, a joint Flow valve, characterized in that:

Install the front cover on the front end of the cylinder and the rear end cover on the rear end, and leather cups are installed at both ends of the cylinder; the brake pads are set between the leather cups on both sides of the cylinder, and one end of the connecting rod B is hinged to the middle of the brake pads and the other end is hinged to the cylinder One end of the connecting rod C is hinged to the middle position of the brake pad, and the other end passes through the groove hole of the cylinder and is hinged to the mandrel; the mandrel is set at the middle position of the front end cover; a brake cylinder is arranged in the cylinder, and the piston of the brake cylinder The rod is connected to the mandrel;

The input shaft of the hydraulic pump protrudes from both sides through the hydraulic pump casing, and rollers are installed at both ends of the input shaft of the hydraulic pump; a supporting spring is arranged between the two hydraulic pumps; the hydraulic pump is arranged outside the rear end cover, and the hydraulic pump is connected to the rear On the end cap or connected to the cylinder;

The oil tank is arranged in the barrel, the oil suction port of the hydraulic pump is connected to the oil tank, the oil outlet of the hydraulic pump is connected to the throttle valve, the oil return port of the throttle valve is connected to the fuel tank, and the front end of the throttle valve is connected to the brake cylinder.

The connecting ring is included, and the feature is that the connecting ring is installed on the outer end of the front cover.

It includes a mounting ring, and is characterized in that: the brake oil cylinder is fixed on the mounting ring, and the mounting ring and the barrel are fixed with screws.

The brake cylinder includes a brake piston rod, a brake piston and a brake cylinder body, the brake cylinder body is fixed to the mounting ring and connected with bolts, the brake cylinder body is provided with a brake piston, the brake piston is connected to the brake piston rod, and the brake piston rod is connected to the spindle ;

It includes a connecting rod A, which is characterized in that: one end of the connecting rod A is connected to a hydraulic pump, and the other end is hinged to the rear end cover or the barrel.

The brake pad is sled-shaped, and the raised part of the brake pad is close to the front end cover.

It includes a sleeve, which is characterized in that: the sleeve is arranged between the front end cover and the mandrel, the sleeve is cylindrical as a whole and fixed to the middle position of the front end cover, and the mandrel can slide in the sleeve.

It includes a supporting cylinder, a connecting rod D and a rod cap, and is characterized in that: the supporting cylinder is arranged on the outside of the rear end cover, the outer end of the piston rod of the supporting cylinder is equipped with a rod cap, and one end of the connecting rod D is hinged to the other end of the hydraulic pump casing To the rod cap; the pressure is drawn from the front end of the throttle valve and connected with the support cylinder.

The support cylinder includes a support cylinder, a support piston, and a support piston rod. The support cylinder is fixed to the rear end cover, the support piston is arranged in the support cylinder, the support piston is connected to the support piston rod, and a rod cap is installed on the outer end of the support piston rod. The rod cap is cylindrical with a base as a whole, and the rod cap is buckled on the end of the supporting piston rod, and the two sides of the rod cap are provided with lugs and a connecting rod D is installed; the other end of the connecting rod D is hinged to the hydraulic pump housing .

It includes a one-way valve, which is characterized in that the one-way valve is set at the outlet of the hydraulic pump.

The beneficial effects of the present invention are: (1) The rotary bypass valve speed-regulating pig of the present invention has no electrical components, is safe and reliable, does not need to store energy through batteries, and can be used for long-distance pipeline pigging; (2) ) can carry pipeline inspection equipment to complete pipeline inspection and pigging work; (3) can be applied to gas pipelines and liquid pipelines; (4) the throttle valve part is set inside the pig, and the throttle valve has enough space to Increase the overall size of the throttle valve to reduce the risk of jamming; (5) The roller is arranged at the rear end of the whole device, and the connecting rod of the roller is arranged obliquely, so that the whole device has a strong passability in the pipeline. The parts are not easy to get stuck.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the hydraulic system of the present invention.

In the figure: 1. Roller; 2. Hydraulic pump; 3. Support spring; 4. Connecting rod A; 5. Rear cover; 6. Cup; 7. Tailgate; 8. Brake pad; ; 10. Connecting rod C; 11. Cylinder body; 12. Front baffle; 13. Front end cover; 14. Sleeve; 15. Connecting ring; 16. Mandrel; 17. Brake cylinder; 18. Brake piston rod; 19 .Brake piston; 20. Brake cylinder; 21. Mounting ring; 22. Oil tank; 23. Support cylinder; 24. Support cylinder; 25. Support piston; 26. Support piston rod; 27. Rod cap; 28. Connecting rod D; 29. One-way valve; 30. Throttle valve.

Detailed ways

The present invention is not limited by the following implementation examples, and specific implementation manners can be determined according to the technical solutions of the present invention and actual conditions. Below in conjunction with Fig. 1, 2, the present invention is described below. Positional relationships such as up, down, left, and right are determined according to the layout direction in Figure 1 of the specification.

The front end cover 13 is installed on the front end of the cylinder body 11 and connected with bolts, and the rear end cover 5 is installed on the rear end of the cylinder body 11 and connected with bolts. The rear end of cylinder body 11 is provided with rear baffle 7 and fixed by welding, the outside of said rear baffle 7 is provided with leather cup 6 and pressed with rear end cover 5, and the rear end cover 5 and rear baffle 7 are connected by bolts. Leather cup 6 is installed outside the front end cover 13 and fixes with front baffle 12, and bolt connects front baffle 12 and front end cover 13. Connecting ring 15 is installed on the outer end of front end cover 13, and described connecting ring 15 is used for installing hook, hooks described connecting ring 15 with hook, makes things convenient for the pipe pig to be taken out from the receiving ball cylinder.

The brake pad 8 is in the shape of a sled, and the raised part of the brake pad 8 is close to the front end cover 13 . The brake pads 8 are arranged between the cups 6 on both sides of the cylinder body 11, one end of the connecting rod B9 is hinged to the middle position of the brake pads 8 and the other end is hinged to the cylinder body 11, one end of the connecting rod C10 is hinged to the middle position of the brake pads 8 and the other end is worn Through the slotted hole of the cylinder 11 and hinged to the mandrel 16. The mandrel 16 is arranged at the middle position of the front end cover 13; more optimally, a sleeve 14 is arranged between the front end cover 13 and the mandrel 16, and the sleeve 14 is cylindrical as a whole and is fixed to the middle position of the front end cover 13. Shaft 16 is slidable within sleeve 14 .

A brake cylinder 17 is arranged inside the barrel 11 , and the piston rod of the brake cylinder 17 is connected to the spindle 16 . The brake cylinder 17 is fixed on the mounting ring 21 , and the mounting ring 21 is fixed with the cylinder body 11 by screws. The brake cylinder 17 includes a brake piston rod 18, a brake piston 19 and a brake cylinder body 20, the brake cylinder body 20 is fixed to the mounting ring 21 and connected with bolts, the brake cylinder body 20 is provided with a brake piston 19, and the brake piston 19 is connected to the brake piston Rod 18 , brake piston rod 18 is connected to spindle 16 .

The two hydraulic pumps 2 are oppositely arranged, and the input shafts of the hydraulic pumps 2 protrude from both sides through the housing of the hydraulic pumps 2 , and rollers 1 are installed at both ends of the input shafts of the hydraulic pumps 2 . A support spring 3 is arranged between the two hydraulic pumps 2, and the support spring 3 presses the roller 1 against the inner wall of the pipeline. One end of the connecting rod A4 is hinged to the casing of the hydraulic pump 2, and the other end is hinged to the rear end cover 5.

A supporting oil cylinder 23 is arranged at the middle position outside the rear end cover 5, and a rod cap 27 is installed on the outer end of the piston rod of the supporting oil cylinder 23, and one end of the connecting rod D28 is hinged to the housing of the hydraulic pump 2 and the other end is hinged to the rod cap 27. Described support oil cylinder 23 comprises support cylinder body 24, support piston 25 and support piston rod 26, and support cylinder body 24 is fixed on the rear end cover 5 and adopts bolt connection, and support piston 25 is arranged in the support cylinder body 24, and support piston 25 Connect and support the piston rod 26, and the rod cap 27 is installed at the outer end of the support piston rod 26. The rod cap 27 has a cylindrical shape with a base as a whole, and the rod cap 27 is buckled on the end of the supporting piston rod 26. Both sides of the rod cap 27 are provided with lugs and a connecting rod D28 is installed. The other end of the connecting rod D28 is hinged to the hydraulic pump. 2 on the housing.

The oil tank 22 is arranged in the cylinder body 11 , and the oil tank 22 is a sealed oil tank 22 . The oil inlet of the hydraulic pump 2 is connected to the fuel tank 22 , the oil outlet of the hydraulic pump 2 is connected to the throttle valve 30 , the oil return port of the throttle valve 30 is connected to the fuel tank 22 , and the front end of the throttle valve 30 is connected to the support cylinder 23 and the brake cylinder 17 . More optimally, a one-way valve 29 is set at the outlet of the hydraulic pump 2 .

The working principle of the present invention is:

The roller 1 is pressed against the inner wall of the pipeline by the support spring 3, and the pig runs in the pipeline driven by the pressure difference between the front and rear media. The roller 1 drives the hydraulic pump 2 to work, and the high-pressure oil output by the hydraulic pump 2 flows back through the throttle valve 30. The oil tank 22 and the pressure at the front end of the throttle valve 30 are transmitted to the support oil cylinder 23 and the brake oil cylinder 17 . The supporting cylinder 23 spreads the two hydraulic pumps 2 through the connecting rod D28, and the contact force between the rollers 1 on both sides of the hydraulic pump 2 and the inner wall of the pipeline increases, reducing the risk of slipping. The greater the running speed of the pig, the greater the driving force generated by the support cylinder 23, and the less likely the roller 1 is to slip.

The thrust generated by the brake cylinder 17 is transmitted to the spindle 16 through the brake piston 19 and the brake piston rod 18, and the spindle 16 makes the brake pad 8 be pressed against the inner wall of the pipeline through the connecting rod B9 and the connecting rod C10. As the running speed of the pig increases, the flow rate of the throttle valve 30 increases, the throttling pressure generated by the throttle valve 30 increases, the pressing force between the brake pad 8 and the pipeline increases, and the resulting braking force increases. Similarly, when the running speed of the pig is reduced, the braking force produced by the brake pad 8 is reduced. In this way, the pig operation speed will be more stable.

Claims (10)

1. a kind of wiper with dead-man's device, including idler wheel, hydraulic pump, rear end cap, leather cup, brake block, connecting rod B, company Bar C, cylinder, drive end bearing bracket, mandrel, brake oil cylinder, fuel tank, throttle valve, it is characterised in that：

Barrel front end installs front end cover back-end and installs rear end cap, and leather cup is arranged in cylinder both ends；Brake block is arranged on cylinder both sides Between leather cup, the one end connecting rod B is hinged to the brake block centre position other end and is hinged on cylinder, and the one end connecting rod C is hinged to brake The piece centre position other end passes through the groove type hole of cylinder and is hinged in mandrel；Mandrel is arranged in drive end bearing bracket centre position；Cylinder Interior setting brake oil cylinder, the piston rod of the brake oil cylinder are connect with mandrel；

Hydraulic pressure pump input shaft passes through casing of hydraulic pump to be stretched out from both sides, and idler wheel is installed at hydraulic pressure pump input shaft both ends；Two liquid Support spring is set between press pump；Hydraulic pump is arranged on the outside of rear end cap, and hydraulic pump is connected on rear end cap or is connected to cylinder On body；

Fuel tank is arranged in cylinder, and hydraulic pump inlet port is connected to fuel tank, and hydraulic pump oil outlet is connected to throttle valve, and throttle valve returns Hydraulic fluid port is connected to fuel tank, and throttle valve front end is connect with brake oil cylinder.

2. a kind of wiper with dead-man's device according to claim 1, including connection ring, it is characterised in that：Connection Ring is arranged on the outside of drive end bearing bracket；Connection ring is installed on drive end bearing bracket or is installed on the outer side shield of the corresponding leather cup of drive end bearing bracket.

3. a kind of wiper with dead-man's device according to claim 1, including mounting ring, it is characterised in that：Brake Oil cylinder is fixed in mounting ring, and screw is fixed between the mounting ring and cylinder.

4. according to a kind of wiper with dead-man's device of claim 1 or 3, it is characterised in that：The brake oil cylinder Including Braking piston bar, Braking piston and brake cylinder body, brake cylinder body is fixed to blending bolt connection in mounting ring, and brake cylinder body Interior setting Braking piston, Braking piston connect Braking piston bar, and Braking piston bar is connected to mandrel.

5. a kind of wiper with dead-man's device according to claim 1, including connecting rod A, it is characterised in that：Connecting rod A One end connects hydraulic pump, and the other end is hinged on rear end cap or on cylinder.

6. a kind of wiper with dead-man's device according to claim 1, it is characterised in that：The brake block is sled Shape, brake block raised portion is close to drive end bearing bracket.

7. a kind of wiper with dead-man's device according to claim 1, including sleeve, it is characterised in that：Sleeve is set It sets between drive end bearing bracket and mandrel, the sleeve generally cylindrical shape is simultaneously fixed to drive end bearing bracket centre position, and mandrel can cover Sliding in cylinder.

8. a kind of wiper with dead-man's device according to claim 1, including support cylinder, connecting rod D and pole cap, It is characterized in that：The support cylinder is arranged on the outside of rear end cap, and pole cap, the one end connecting rod D are installed in the piston rod outer end of support cylinder The casing of hydraulic pump other end is hinged to be hinged on pole cap；It draws pressure and is connect with support cylinder in throttle valve front end.

9. a kind of wiper with dead-man's device according to claim 8, it is characterised in that：The support cylinder includes Support cylinder body, support piston, support piston rod；Cylinder body is supported to be fixed on rear end cap, support piston is arranged in shoring body, Piston connection support piston rod is supported, pole cap is installed in support piston rod outer end；The pole cap generally cylindrical shape with pedestal, bar Cap is buckled in support piston rod end, and journal stirrup and installing connecting rods D is arranged in pole cap both sides；The connecting rod D other ends are hinged to hydraulic pump On shell.

10. a kind of wiper with dead-man's device according to claim 1, including check valve, it is characterised in that：Unidirectionally Valve is arranged in hydraulic pump outlet position.