A clutch-type pipe cleaning device for rescuing pigs stuck in pipes

Abstract

The present invention belongs to the technical field of pipeline pig rescue, and solves the problem of effective pipeline pig unblocking. The present invention relates to a clutch-type pipe cleaner for rescuing blocked pipeline pigs, comprising a frame, a rescue device, a guide sealing device, and a buffer device; the frame is a cylindrical steel frame with an opening at the front end and a rear end cover fixed at the rear end; two long slots are symmetrically provided in the middle of the frame; the guide sealing device comprises front and rear guide sealing assemblies, which are respectively installed at the front and rear of the frame, and both are in sealing contact with the inner wall of the pipeline; the rescue device comprises an electric motor, a centrifugal dual clutch mechanism, a brake mechanism, and an impact action part; the brake mechanism is composed of two symmetrical brake plates and a brake plate radial movement drive mechanism, and the brake plate radial movement drive mechanism is installed in the two long slots; the impact action part is arranged at the front of the inner cavity of the frame, and is a linear motion mechanism along the axial direction of the frame; the buffer device comprises a buffer pad fixed to the power output end of the impact action part. The present invention realizes effective pipeline pig unblocking.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline pig rescue, and in particular relates to a clutch-type pipeline cleaning device for rescuing pigs stuck in pipelines. Background Art

[0002] Currently, a pipe pig is a commonly used device for defect detection in oil and gas pipelines. It travels along with the pipeline medium within the pipeline. During the inspection process, if a pipe pig encounters a partially opened ball valve or weld, it can become lodged inside the pipeline, creating a blockage and causing problems such as poor flow of the medium. Currently, a pipe cleaner is typically placed inside the pipeline to dislodge the blocked pipe pig. Existing pipe pigs primarily consist of a steel frame, a front guide cup fixed to the frame, a front sealing cup, and a rear sealing cup. During operation, the medium within the pipeline generates thrust on the pig, which impacts the rear end of the pig to unblock the blockage. However, if the pig's blocking force is strong, the impact force provided by the pig is insufficient to dislodge the pig, making successful removal difficult. Furthermore, the direct, rigid impact between the pig and the rear end of the pig can easily cause significant damage to the pig. If the pig cannot be dislodged, manual excavation is required, which consumes significant manpower and material resources.

[0003] Therefore, it is necessary to design an improved pipe cleaning device that can improve the success rate of rescuing pipeline pigs and reduce damage to pipeline pigs during the solution process. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hydraulically driven pipe cleaning device for rescuing stuck pipe pigs, which can reduce damage to pipe pigs and significantly improve the success rate of rescue.

[0005] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0006] A clutch type pipe cleaning device for rescuing stuck pigs in pipes, characterized by comprising a frame, a rescuing device, a guide sealing device and a buffer device;

[0007] The frame is a cylindrical steel frame with an open front end and a rear end cover fixed to the rear end; two long slots are symmetrically arranged in the middle of the frame, and the two long slots are arranged along the axial direction of the frame;

[0008] The guide seal device includes a front guide seal assembly and a rear guide seal assembly. The front guide seal assembly is fixed to the frame in front of the long slot; the rear guide seal assembly is fixed to the frame in the rear of the long slot. Both the front guide seal assembly and the rear guide seal assembly form a sealing contact with the inner wall of the pipeline.

[0009] The rescue device includes an electric motor, a centrifugal dual-clutch mechanism, a brake mechanism, and an impact action part; the electric motor is fixedly mounted on the inner cavity wall of the frame; the centrifugal dual-clutch mechanism is a dual-output switching mechanism having a power input end, an inner output end, and an outer output end; the power input end is drivingly connected to the output shaft of the electric motor, the inner output end is drivingly connected to the brake mechanism, and the outer output end is drivingly connected to the impact action part, so as to transmit the output of the electric motor to the brake mechanism when the motor is running at a low speed, and output the output to the impact action part when the motor is running at a high speed;

[0010] The brake mechanism is composed of two symmetrically arranged brake plates and a brake plate radial movement drive mechanism; the two brake plates are arranged outside the frame and located between the front and rear guide seal assemblies, and the brake plate radial movement drive mechanism is installed in the long slot on the frame;

[0011] The impact part is arranged at the front of the inner cavity of the frame and is a linear motion mechanism along the axial direction of the frame;

[0012] The buffer device includes a buffer pad, which is fixed to the power output end of the impact part by a front connecting screw;

[0013] The machine also includes a first pressure sensor installed on the buffer pad, a second pressure sensor installed on the brake plate, and an electric control device installed on the inner pipe wall of the frame.

[0014] Moreover, the centrifugal dual-clutch mechanism includes a sheave clutch support frame, an inner friction plate, an outer friction plate, an inner spring and an outer spring; the clutch support frame is coaxially fixedly connected to a connecting plate fixed to the output shaft end of the motor; the inner friction plate and the outer friction plate are both made of a high friction coefficient material; the inner friction plate and the outer friction plate are each two pieces, and the inner friction plate and the outer friction plate are arc-shaped plates; the two inner friction plates are relatively arranged in the inner hole of the clutch support frame; the inner springs are two groups, and the two groups of inner springs are respectively arranged between the outer sides of the two inner friction discs and the inner hole wall of the clutch support frame, and the inner springs are compression springs; the two outer friction plates are relatively arranged in the outer ring groove of the clutch support frame in a clearance fit manner; the outer springs are two groups, and the two groups of outer springs are tension springs, and the two groups of outer springs are respectively radially arranged on the inner sides of the two outer friction plates, the inner ends of the outer springs are connected to the hanging spring parts fixed on the sheave clutch support frame, and the outer ends of the outer springs are connected to the hanging spring parts fixed on the inner sides of the outer friction plates.

[0015] Moreover, a radial through hole is provided in the middle of the clutch support frame; an outer force transmission rod is vertically connected to the middle of the inner side of the two outer friction plates, and an inner force transmission rod is vertically connected to the middle of the outer side of the two inner friction plates, and the inner force transmission rod and the outer force transmission rod are inserted into the radial through hole on the clutch support frame in a clearance fit manner.

[0016] Moreover, the brake plate radial movement drive mechanism includes a transmission shaft, two front and rear sliders, two sets of connecting rod groups, two brake plate support seats, and a brake support disc; the transmission shaft is composed of a front section, a middle section and a rear section; the front section of the transmission shaft is inserted into the inner hole of the clutch support frame and is surrounded by the inside of the two inner friction plates; the middle section of the transmission shaft is provided with positive threads and negative threads at both ends, which form threaded connections with the two sliders respectively; the rear section of the transmission shaft is coaxially fixedly connected to the brake support disc, and the brake support disc forms a gap with the inside of the pipe through the outer peripheral surface. Cooperation; Both groups of connecting rods are composed of four connecting rods, and the two groups of connecting rods are symmetrically arranged, each including two rear connecting rods arranged in parallel and two front connecting rods arranged in parallel, the inner ends of the two front connecting rods are hinged to the corresponding ends of the front slider on both sides through pins, and the inner ends of the two rear connecting rods are hinged to the corresponding ends of the rear slider on both sides through pins; the outer ends of the four connecting rods of each group of connecting rods are hinged to the inner parts of the corresponding brake plate support seats; the inner middle parts of the inner sides of the two brake plates are fixedly connected to the outer sides of the two brake plate support seats respectively.

[0017] Moreover, the impact action part includes a transmission cylinder, a transmission screw, a rotating plate, an impact stud, an impact cylinder, and a connecting screw; the transmission cylinder as a whole or the inner hole portion is made of a high friction coefficient material; the transmission cylinder is sleeved on the outside of the outer friction plate; when the motor is not started or running at a low speed, a fitting gap is provided between the transmission cylinder and the outer side surface of the outer friction plate, and when the motor is running at a high speed, the transmission cylinder and the outer side surface of the outer friction plate form friction contact; the rotating plate is provided at the front of the transmission cylinder, and a mounting groove is provided on the frame, and the rotating plate is embedded in the mounting groove in a manner of being limited along the axial direction of the frame; the transmission cylinder and the rotating plate are connected by a plurality of transmission screws evenly distributed along the circumference; the impact stud is coaxially fixedly connected to the transmission plate by a connecting screw provided in the center, and an external thread is provided on the outer circumferential surface of the impact stud; an internal thread is provided on the inner hole surface of the impact cylinder, which is connected to the external thread of the impact stud through the internal thread; the front end of the impact cylinder constitutes the power output end of the impact action part.

[0018] The advantages and positive effects of the present invention are:

[0019] 1. The present invention achieves isolation of the media in front and behind the pig by installing guide sealing devices at the front and rear of the cylindrical frame. In this way, the pig can move with the media through the pressure difference of the media, and the pig can be pushed to the rear of the pig that is blocking the pipeline.

[0020] 2. The rescue device of the present invention is composed of an electric motor, a centrifugal dual-clutch mechanism, a brake mechanism and an impact action part; the centrifugal dual-clutch is used to transmit the rotational power of the electric motor to the brake mechanism at a low speed, and the high-friction contact between the brake plate of the brake part and the inner wall of the pipeline is used to position the pipe cleaner close to the rear of the blocked pipe pig; and when the electric motor runs to a high-speed state, the centrifugal dual-clutch is used to transmit the rotational power to the device part, and the impact action part drives the buffer pad to apply thrust to the rear end of the pipe pig, applying a forward pushing force to the pipe pig. The force generated by the rescue device is greater than the force acting on the rear end of the pipe pig through the existing pressure difference of the pipeline medium. The larger force can achieve the unblocking of the pipe pig.

[0021] 3. The present invention achieves top-pressing contact with the rear end of the blocked pipe pig through the buffer pad, thereby ensuring successful rescue of the pipe pig and avoiding damage to the pipe pig caused by rigid contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a side view of the overall structure of the present invention;

[0023] Figure 2 It is a longitudinal sectional view of the overall structure of the present invention;

[0024] Figure 3 yes Figure 2 A partial enlarged view of the centrifugal dual clutch mechanism;

[0025] Figure 4 It is an overall axonometric drawing of the present invention;

[0026] Figure 5 It is an overall side view of the rescue device of the present invention;

[0027] Figure 6 is an axonometric view of the rescue device of the present invention;

[0028] Figure 7 Figure 6 A structural diagram showing another angle without the impact tube;

[0029] Figure 8 It is a schematic diagram of the installation of the rescue device of the present invention;

[0030] Figure 9 It is a rear view of the present invention;

[0031] Figure 10 It is a comparison diagram of the brake device part and the impact device part of the present invention in two working positions. DETAILED DESCRIPTION

[0032] The structure of the present invention will be further described below with reference to the accompanying drawings and through examples. It should be noted that the present examples are descriptive rather than restrictive.

[0033] like Figures 1 to 10 As shown, a clutch-type pipe cleaner for rescuing a blocked pipe pig, the invention of which is as follows: it includes a frame 3, a rescue device 4, a guide sealing device 2, and a buffer device 1. The frame is used to realize the centralized installation of the other three parts to form the overall structure of the pipe cleaner. The guide sealing device is used to achieve sealed contact between the pipe cleaner and the inner wall of the pipeline, so as to form a pressure difference before and after the pipe cleaner, so that under the action of the fluid in the pipeline at the rear end of the pipe cleaner, the pipe cleaner is pushed to move toward the position of the pipe pig. The rescue device is used to fix the pipe cleaner to the rear part of the blocked pipe pig, and apply forward pushing pressure to the rear end of the pipe pig to achieve the rescue of the pipe pig. The buffer device is used to be installed at the force-applying end of the rescue device, and is in direct contact with the rear end of the pipe pig through the buffer device.

[0034] The frame is a cylindrical steel frame with an opening at the front end and a rear end cover 3.3 fixed thereto by screws at the rear end. Two long slots are symmetrically arranged in the middle of the frame, and the two long slots are arranged along the axial direction of the frame.

[0035] The guide sealing device includes a front guide sealing assembly and a rear guide sealing assembly. The front guide sealing assembly is fixed on the frame at the front of the long slot hole; the rear guide sealing assembly is fixed on the frame at the rear of the long slot hole. Both the front guide sealing assembly and the rear guide sealing assembly form a sealing contact with the inner wall of the pipeline.

[0036] To facilitate the installation and fixation of the front guide seal assembly and the rear guide seal assembly, a front flange 3.1 and a rear flange 3.2 are welded on the front and rear sides of the long slotted hole on the frame, respectively. The front guide seal assembly includes a front pressure plate 2.1, a front guide sleeve 2.2, a front first sealing cup 2.3, a front spacer sleeve 2.4 and a front second sealing cup 2.5, which are arranged in sequence in the front and rear directions. The front guide seal assembly is fixedly connected to the front flange by bolts evenly distributed along the circumference. The maximum outer diameter of the front first sealing cup and the front second sealing cup forms a sealing contact with the interior of the pipe. The rear guide seal assembly includes a rear first sealing cup 2.6, a rear spacer sleeve 2.7, a rear second sealing cup 2.8 and a rear pressure plate 2.9. The rear guide seal assembly is fixedly connected to the rear flange by bolts evenly distributed along the circumference.

[0037] The rescue device includes a motor 4.1, a centrifugal dual-clutch mechanism 4.2, a brake mechanism 4.3, and an impact-applying portion 4.4. The motor is fixedly mounted on the inner wall of the frame, the centrifugal dual-clutch mechanism is drivingly connected to the motor output shaft 4.1.1, the brake mechanism is drivingly connected to the inner output end of the centrifugal dual-clutch mechanism, and the impact-applying portion is drivingly connected to the outer output end of the centrifugal dual-clutch mechanism.

[0038] The centrifugal dual-clutch mechanism is used to transmit the motor's output to the brake mechanism during low-speed operation and to the impact-affecting component during high-speed operation. The centrifugal dual-clutch mechanism primarily comprises a sheave clutch support frame 4.2.1, an inner friction plate 4.2.7, an outer friction plate 4.2.2, an inner spring 4.2.6, and an outer spring 4.2.3. The clutch support frame is coaxially fixed to a connecting plate secured to the motor's output shaft via multiple bolts arranged along its circumference. Both the inner and outer friction plates are made of a high-friction material, such as silicone rubber, or by increasing the surface roughness of ordinary rubber to increase the friction coefficient. Each of the inner and outer friction plates consists of two circular arc-shaped plates. The two inner friction plates are positioned opposite each other within the inner bore of the clutch support frame. Two sets of inner springs are located between the outer sides of the two inner friction plates and the inner bore wall of the clutch support frame. The inner springs are compression springs. The two outer friction plates are positioned relative to each other in the outer ring groove of the clutch support frame with a clearance fit. Two sets of outer springs are tension springs, radially positioned on the inner sides of the two outer friction plates. The inner ends of the outer springs are connected to the spring hooks fixed to the sheave clutch support frame, while the outer ends of the outer springs are connected to the spring hooks fixed to the inner sides of the outer friction plates.

[0039] To ensure stable and reliable transmission of the motor's output to the brake mechanism and impact-affecting components, a radial through-hole is provided in the center of the clutch support frame. An outer force transfer rod 4.2.4 is vertically connected to the center of the inner side of the two outer friction plates, while an inner force transfer rod 4.2.5 is vertically connected to the center of the outer side of the two inner friction plates. These inner and outer force transfer rods are inserted into the radial through-holes of the clutch support frame with a clearance fit.

[0040] The cooperation between the force transmission rod and the radial through hole plays a role in torque transmission on the one hand, and plays an auxiliary guiding role in the movement of the inner friction plate and the outer friction plate on the other hand.

[0041] The brake mechanism is used to secure the pig to a predetermined position behind the blocked pig in the pipeline. It primarily comprises a drive shaft 4.3.2, two front and rear sliders 4.3.3, two connecting rod assemblies 4.3.5, two brake plate support bases 4.3.6, two brake plates 4.3.1, and a brake support disc 4.3.4.

[0042] The transmission shaft is composed of a front section, a middle section, and a rear section. The front section of the transmission shaft is inserted into the inner hole of the clutch support frame and is enclosed within the two inner friction plates. The middle section of the transmission shaft is provided with positive and negative threads at both ends, which are respectively threadedly connected to the two sliders. The rear section of the transmission shaft is coaxially fixedly connected to the brake support disc. The brake support disc forms a clearance fit with the interior of the pipe through the outer peripheral surface, thereby supporting the brake mechanism. Both groups of connecting rods are composed of four connecting rods. The two groups of connecting rods are symmetrically arranged, each including two rear connecting rods arranged in parallel and two front connecting rods arranged in parallel. The inner ends of the two front connecting rods are hinged to the corresponding ends of the front sliders on both sides through pins, and the inner ends of the two rear connecting rods are hinged to the corresponding ends of the rear sliders on both sides through pins. The outer ends of the four connecting rods in each group of connecting rods are respectively hinged to the interior of the corresponding brake plate support seat. The two brake plates are arc-shaped plates, and the inner middle parts of the two brake plates are respectively fixedly connected to the outer sides of the two brake plate support seats. The two brake pads are made of high friction coefficient materials, such as silicone rubber, or ordinary rubber materials with increased surface roughness to increase the friction coefficient.

[0043] The impacting portion is located at the front of the inner cavity of the frame and includes a transmission cylinder 4.4.4, a transmission screw 4.4.3, a rotating plate 4.4.2, an impact stud 4.4.5, an impact cylinder 4.4.1, and a connecting screw 4.4.6. The transmission cylinder, either as a whole or in its inner hole, is made of a high-friction material. The transmission cylinder is sleeved onto the exterior of the outer friction plate. When the motor is not started or operating at low speed, a clearance is provided between the transmission cylinder and the outer surface of the outer friction plate. The rotating plate is located at the front of the transmission cylinder and has a mounting slot provided on the frame. The rotating plate is inserted into the mounting slot so as to be axially constrained in the frame. The transmission cylinder and the rotating plate are connected by a plurality of transmission screws evenly spaced along the circumference. The impact stud is coaxially fixedly connected to the transmission plate by a connecting screw provided in the center. An external thread is provided on the outer circumferential surface of the impact stud. An internal thread is provided on the inner hole surface of the impact cylinder, which is connected to the external thread of the impact stud via the internal thread.

[0044] The buffer device is arranged in front of the steel frame, and comprises a buffer pad 1.1 and a front end connecting screw 1.2. The buffer pad is fixed to the front end of the impact screw barrel through the front end connecting screw bolt.

[0045] In addition to the aforementioned technical features, a first pressure sensor 5 is mounted on the buffer pad, a second pressure sensor 6 is mounted on the brake pad, and an electronic control device (not shown in the accompanying drawings) is mounted on the internal pipe wall of the frame. The first pressure sensor on the buffer pad detects contact between the buffer pad and the rear end of the pipe pig and whether the pipe pig is unblocked. The contact signal is then transmitted to the electronic control device, which then starts or stops the motor based on the signal. The second pressure sensor on the brake plate detects brake pressure. When the set value is reached, the motor switches from low speed to high speed.

[0046] The working principle of this clutch type pipe cleaning device for rescuing stuck pipe pigs:

[0047] During the operation of the device, the pipe cleaner runs in the pipeline under the push of the medium inside the pipeline. When the buffer pad contacts the tail of the pipe pig, the first pressure sensor detects the signal and transmits it to the electronic control device. After the electronic control device sends a start signal to the motor, the motor output shaft 211 of the motor 21 rotates slowly, driving the centrifugal dual-clutch mechanism 22 to rotate. At this time, the inner friction plate forms friction contact with the transmission shaft of the brake mechanism; while the outer friction plate does not contact the inner wall of the transmission cylinder, thereby driving the transmission shaft to rotate. The rotation of the transmission shaft drives the left and right slides to move to the middle position, and then drives the two brake plates to move radially outward through two sets of connecting rod groups and two brake plate support seats. See attached. Figure 10 , moves from position A to position B, generates friction with the pipe wall, and then realizes the braking process; when the brake pressure reaches the set value, the motor runs to a high-speed state, and under the action of a large centrifugal force, the outer friction plate moves radially outward and forms friction contact with the inner wall surface of the transmission cylinder, realizing the transmission of the power of the motor to the impact part, the transmission cylinder drives the rotating plate to rotate through the transmission screw, and the rotating plate drives the impact stud to rotate through the connecting screw, and the impact cylinder moves outward along the axial direction of the impact stud, see attached Figure 10 , moving from position C to position D, ultimately using the cushion to act on the rear end of the pipe pig, gradually pushing it out of the jam. When the motor reaches high speed, centrifugal force also causes the inner friction plate to move outward along the feed path, breaking away from frictional contact with the drive shaft. The self-locking nature of the threads ensures that the two brake plates remain in close contact with the inner wall of the pipe while the impacting portion exerts force on the rear end of the pipe pig.

[0048] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various replacements, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A clutch-type pipe cleaning device for rescuing pigs from blocked pipes, characterized by: It includes a frame, a rescue device, a guide sealing device and a buffer device; The frame is a cylindrical steel frame with an open front end and a rear end cover fixed to the rear end; two long slots are symmetrically arranged in the middle of the frame, and the two long slots are arranged along the axial direction of the frame; The guide seal device includes a front guide seal assembly and a rear guide seal assembly. The front guide seal assembly is fixed to the frame in front of the long slot; the rear guide seal assembly is fixed to the frame in the rear of the long slot. Both the front guide seal assembly and the rear guide seal assembly form a sealing contact with the inner wall of the pipeline. The rescue device includes an electric motor, a centrifugal dual-clutch mechanism, a brake mechanism, and an impact action part; the electric motor is fixedly mounted on the inner cavity wall of the frame; the centrifugal dual-clutch mechanism is a dual-output switching mechanism having a power input end, an inner output end, and an outer output end; the power input end is drivingly connected to the output shaft of the electric motor, the inner output end is drivingly connected to the brake mechanism, and the outer output end is drivingly connected to the impact action part, so as to transmit the output of the electric motor to the brake mechanism when the motor is running at a low speed, and output the output to the impact action part when the motor is running at a high speed; The brake mechanism is composed of two symmetrically arranged brake plates and a brake plate radial movement drive mechanism; the two brake plates are arranged outside the frame and located between the front and rear guide seal assemblies, and the brake plate radial movement drive mechanism is installed in the long slot on the frame; The impact part is arranged at the front of the inner cavity of the frame and is a linear motion mechanism along the axial direction of the frame; The buffer device includes a buffer pad fixed to the power output end of the impact action part; The machine also includes a first pressure sensor installed on the buffer pad, a second pressure sensor installed on the brake plate, and an electric control device installed on the inner pipe wall of the frame.

2. The clutch type pig for rescuing a stuck pipe pig according to claim 1, characterized in that: The centrifugal dual-clutch mechanism includes a sheave clutch support frame, an inner friction plate, an outer friction plate, an inner spring and an outer spring; the clutch support frame is coaxially fixedly connected to a connecting plate fixed to the output shaft end of the motor; the inner friction plate and the outer friction plate are both made of a material with a high friction coefficient; the inner friction plate and the outer friction plate are each two pieces, and the inner friction plate and the outer friction plate are both arc-shaped plates; the two inner friction plates are arranged oppositely in the inner hole of the clutch support frame; the inner springs are in two groups, and the two groups of inner springs are respectively arranged between the outer sides of the two inner friction plates and the inner hole wall of the clutch support frame, and the inner springs are compression springs; the two outer friction plates are arranged oppositely in the outer ring groove of the clutch support frame in a clearance fit manner, and the outer springs are in two groups, and the two groups of outer springs are tension springs, and the two groups of outer springs are respectively arranged radially on the inner sides of the two outer friction plates, the inner ends of the outer springs are connected to the hanging spring parts fixed on the sheave clutch support frame, and the outer ends of the outer springs are connected to the hanging spring parts fixed on the inner sides of the outer friction plates.

3. The clutch type pig for rescuing a stuck pipe pig according to claim 2, characterized in that: A radial through hole is provided in the middle of the clutch support frame; an outer force transmission rod is vertically connected to the middle of the inner side of the two outer friction plates, and an inner force transmission rod is vertically connected to the middle of the outer side of the two inner friction plates. The inner force transmission rod and the outer force transmission rod are inserted into the radial through hole on the clutch support frame in a clearance fit manner.

4. The clutch type pig for rescuing a stuck pipe pig according to claim 2, characterized in that: The brake plate radial movement drive mechanism includes a transmission shaft, two front and rear sliders, two groups of connecting rod groups, two brake plate support seats, and a brake support disc; the transmission shaft is composed of a front section, a middle section and a rear section; the front section of the transmission shaft is inserted into the inner hole of the clutch support frame and is surrounded by the interior of the two inner friction plates; the middle section of the transmission shaft is provided with positive threads and negative threads at both ends, which are respectively threadedly connected with the two sliders; the rear section of the transmission shaft is coaxially fixedly connected with the brake support disc, and the brake support disc forms a clearance fit with the interior of the pipe through the outer circumference; the two groups of connecting rod groups are composed of four connecting rods, and the two groups of connecting rod groups are symmetrically arranged, each including two rear connecting rods arranged in parallel and two front connecting rods arranged in parallel, the inner ends of the two front connecting rods are hinged to the corresponding ends of the front slider on both sides through pins, and the inner ends of the two rear connecting rods are hinged to the corresponding ends of the rear slider on both sides through pins; the outer ends of the four connecting rods of each connecting rod group are respectively hinged to the interior of the corresponding brake plate support seat; the inner middle of the two brake plates are respectively fixedly connected to the outer sides of the two brake plate support seats.

5. The clutch type pig for rescuing a stuck pipe pig according to claim 2, characterized in that: The impact action part includes a transmission cylinder, a transmission screw, a rotating plate, an impact stud, an impact cylinder, and a connecting screw; the transmission cylinder as a whole or the inner hole portion is made of a high friction coefficient material; the transmission cylinder is sleeved on the outside of the outer friction plate; when the motor is not started or running at a low speed, a fitting gap is provided between the transmission cylinder and the outer side surface of the outer friction plate, and when the motor is running at a high speed, the transmission cylinder and the outer side surface of the outer friction plate form friction contact; the rotating plate is provided at the front of the transmission cylinder, and a mounting groove is provided on the frame, and the rotating plate is embedded in the mounting groove in a manner of being limited along the axial direction of the frame; the transmission cylinder and the rotating plate are connected by a plurality of transmission screws evenly distributed along the circumference; the impact stud is coaxially fixedly connected to the transmission plate by a connecting screw provided in the center, and an external thread is provided on the outer circumferential surface of the impact stud; an internal thread is provided on the inner hole surface of the impact cylinder, which is connected to the external thread of the impact stud through the internal thread; the front end of the impact cylinder constitutes the power output end of the impact action part.

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