Process equipment for stripping the coating layer of coated sucker rod

Abstract

The present invention provides a process equipment for stripping the outer coating layer of a coated sucker rod, which includes a frame, and a conveying device and a tool module arranged on the frame; the conveying device is used to carry the coated sucker rod to move in a straight line; the tool module includes: a tool holder, an actuator, a clamping member and a cutting knife; two groups of the tool modules are symmetrically arranged on both sides of the moving path of the coated sucker rod; the clamping member and the cutting knife are arranged on the tool holder. The equipment of the present invention has a simple and compact structure, is easy to operate, has high safety, and has high production efficiency. It can automatically strip the coating layer of the coated sucker rod, and achieves the purpose of stripping the coating layer of the coated sucker rod.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas development, in particular to a process equipment for stripping a coating layer off a coated sucker rod. Background Art

[0002] At present, most of the oil field production wells use rod production. With the increasing proportion of water injection wells, inclined wells, directional wells, horizontal wells, etc., the mineralization degree and corrosive medium content in the well fluid are increasing. There is an urgent need for corrosion-resistant and anti-eccentric wear sucker rod products for oil wells. Coated sucker rods have been widely recognized for their high cost-effectiveness.

[0003] When the coating of the coated sucker rod is damaged after the well is pulled out, the rod body inside should be further inspected and the coating needs to be stripped off. The current method of stripping the coating is to use a tool to cut a slit and then peel it off manually, which is easy to scratch the surface of the rod body and has low production efficiency. Summary of the invention

[0004] The object of the present invention is to provide a process equipment for stripping the outer coating layer of a coated sucker rod, so as to solve the technical problems of easy scratching of the rod body and low efficiency existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a process equipment for stripping the outer coating layer of a coated sucker rod, comprising: a frame, and a conveying device and a tool module arranged on the frame;

[0006] The conveying device is used to carry the coated sucker rod and move it in a straight line;

[0007] The tool module includes: a tool holder, an actuator, a clamping member (such as a clamping rod or a clamping knife) and a cutting knife;

[0008] The two groups of the tool modules are symmetrically arranged on both sides of the moving path of the wrapped sucker rod; the clamping member and the cutting knife are arranged on the tool holder;

[0009] The actuator is used to force the tool holder carrying the clamping member and the cutting knife to approach or move away from the coated sucker rod; in the direction approaching the coated sucker rod, the end (or top end, the end close to the sucker rod) of the clamping member protrudes from the tip of the cutting knife, and when stripping off the coating layer covering the sucker rod, the clamping members of the two groups of tool modules clamp the coated sucker rod from both sides, and the cutting knife pierces the coating layer without contacting the metal rod body of the coated sucker rod, so as to strip off the coating layer of the sucker rod without scratching the metal rod body when the coated sucker rod moves along the moving path and passes through the cutting knife.

[0010] Among them, the two clamping parts clamp the sucker rod from both sides, which plays a radial limiting role on the sucker rod, preventing the sucker rod from moving radially when the coating layer is peeled off. At the same time, the clamping part protrudes from the cutting knife setting, thereby limiting the cutting knife, preventing the cutting knife from contacting the metal rod body of the sucker rod in the radial direction of the sucker rod, thereby protecting the metal rod body.

[0011] Further, the conveying device is a chain conveying mechanism, comprising: a driving motor, a driving sprocket, a driven sprocket and a chain;

[0012] The chain is provided with a hook for dragging the coated sucker rod, and the driving motor drives the chain to move circularly through the driving sprocket, and the chain drags the coated sucker rod through the hook to pass between the two groups of the tool modules.

[0013] Furthermore, the chain is arranged below the covered sucker rod, the hook is U-shaped, and the opening of the hook is arranged away from the chain.

[0014] The U-shaped hook is matched with the neck of the wrench square (a regular polyhedral end block used for clamping by a wrench) covering the end of the sucker rod, and the neck of the wrench square is inserted into the groove of the hook to drag the sucker rod.

[0015] Furthermore, the chain extends from the loading side of the tool module to the unloading side. During loading, the U-shaped hook gradually flips from the bottom of the chain to the top of the chain as the chain moves, and the hook gradually adjusts from the opening downward to the opening upward, thereby automatically hooking the neck of the covered sucker rod wrench to achieve dragging; during unloading, the hook moves to the unloading side of the tool module, and the hook gradually flips from the top of the chain to the bottom of the chain as the chain moves, and the hook gradually adjusts from the opening upward to the opening downward, thereby automatically achieving separation from the neck of the covered sucker rod wrench.

[0016] Furthermore, the number of the hooks is two, and the two hooks are evenly spaced and arranged in the circumferential direction of the chain, so as to continuously drag the coated sucker rod to realize continuous operation.

[0017] There are two hooks, which can realize continuous production operations and greatly improve production efficiency; at the same time, combined with the setting of U-shaped hooks, automatic loading and unloading can be realized.

[0018] Furthermore, the chain is provided with a plurality of support plates which are arranged at intervals and are used to support the coated sucker rod.

[0019] A limiting structure (such as a V-shaped arrangement, a trapezoidal groove, etc.) is arranged on the support plate to limit the rolling of the covered sucker rod.

[0020] Furthermore, a chain track (made of channel steel) is arranged on the frame, a plurality of straightening wheels are arranged on the chain, and straightening tracks for limiting and guiding the straightening wheels are arranged on both sides of the chain track.

[0021] In addition, the track can also be in other forms, for example, the frame is provided with a track, the track is laid on both sides of the chain and drags the support plate from below. During the loading process, the coated sucker rod is slidably mounted on the track through the support plate, and the coated sucker rod moves more smoothly.

[0022] The front end of the cutting knife tip is sharp and used for cutting the coating layer covering the sucker rod, and the back of the cutting knife is wider and used for peeling off the coating layer covering the sucker rod.

[0023] Furthermore, a slide rail is provided on the frame, the slide rail is perpendicular to the moving path of the covered sucker rod, and the tool holder is slidably provided on the slide rail.

[0024] Preferably, the slide rail is a rail with a dovetail-shaped cross section, and a sliding block matched with the rail is provided at the bottom of the tool holder.

[0025] Furthermore, the actuator is a pneumatic cylinder, an oil cylinder or an electric telescopic mechanism.

[0026] Furthermore, it also includes a loading device and a unloading device for loading and unloading the coated sucker rod;

[0027] The loading device and the unloading device each include at least one storage rack, which is arranged close to the moving path. In the moving direction of the coated sucker rod, two storage racks are respectively arranged on both sides of the tool module.

[0028] For example, the storage racks of the loading device and the unloading device are used to store the sucker rods that need to be stripped of the coating and the sucker rods that have been stripped of the coating, respectively.

[0029] Furthermore, the tool holder is provided with at least two tool grooves, and the clamping member and the cutting knife are clamped in the tool grooves and fastened by bolts.

[0030] Furthermore, the clamping member is a push rod, and the end of the push rod is a smooth arc surface;

[0031] Alternatively, the clamping member includes a rod body and a clamping wheel, and the clamping wheel is rotatably arranged at the top end of the rod body. When working, the clamping wheel abuts against the covered sucker rod and rotates with the movement of the covered sucker rod; the end of the clamping member is the part on the outer circumferential surface of the clamping wheel that is closest to the covered sucker rod.

[0032] Furthermore, it also includes a control system, which includes a controller connected to the actuator and used to control the tool holder to carry the clamping member and the cutting knife to approach or move away from the coated sucker rod.

[0033] Specifically, when the actuator is an air cylinder or an oil cylinder, the control system also includes a control valve. The controller controls the movement of the cylinder or the oil cylinder through the control valve to achieve slow advance and fast retreat of the tool holder. When the sucker rod is clamped, the tool slowly approaches the sucker rod to prevent damage to the tool. When the outer coating layer of the coated sucker rod is stripped off, the tool holder quickly gives way to prevent the clamping part and the cutting knife from touching the mushroom head at the end of the sucker rod.

[0034] Furthermore, the frame is made of steel, with a drive motor and a drive sprocket installed at one end; a platform is provided at the other end, a driven sprocket is installed below the platform, the tool module is installed above the platform, and an equipment control switch is set on the platform; a chain track made of channel steel is provided on the frame.

[0035] The working principle of the process equipment for stripping the outer coating layer of the coated sucker rod provided by the present invention is as follows:

[0036] The operator hangs the coated sucker rod on the hook of the peeling device, presses the start button of the actuator (cylinder), and the actuator pushes the two knife holders to move, so that the clamping parts clamp the metal rod body of the sucker rod, starts the drive motor to run, and the drive sprocket installed at the end of the motor shaft drives the chain to run. The sucker rod hook on the chain pulls the sucker rod to move, and the coating layer of the sucker rod is cut and separated when passing through the cutting knife on the knife holder; when the mushroom head at the other end of the coated sucker rod runs to the set position, the actuator controls the knife holder to retract, and the knife holder gives way to avoid the mushroom head. The motor continues to run until the sucker rod automatically detaches from the hook, and the unloading device includes a pneumatic unloading mechanism, which pushes the sucker rod to the storage rack.

[0037] By adopting the above technical solution, the present invention has the following beneficial effects:

[0038] 1. The equipment has a simple and compact structure, convenient operation, high safety and high production efficiency. It can automatically strip the coating of the sucker rod, achieving the purpose of stripping the coating of the sucker rod.

[0039] 2. The tightening piece maintains the gap between the cutting knife and the metal rod body of the oil pumping rod, so that the metal rod body will not be damaged while the coating is removed.

[0040] 3. A travel switch and a throttle valve are also provided to prevent the tool from colliding with the end of the rod and damaging the rod.

[0041] 4. Two sucker rod hooks can reduce the no-load operation of the motor and achieve continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A front view of a process equipment for stripping a coating layer from a coated sucker rod provided by an embodiment of the present invention;

[0044] Figure 2 for Figure 1 A top view of the process equipment for stripping the coating layer off the coated sucker rod shown;

[0045] Figure 3 A schematic diagram of the structure of a tool module in an embodiment of the present invention;

[0046] Figure 4 for Figure 1 Top view of the tool module shown.

[0047] Figure 5 for Figure 1 The guide mechanism and sucker rod hook of the conveying device shown.

[0048] Reference numerals:

[0049] 1-covered sucker rod; 10-frame; 20-conveying device; 21-driving sprocket; 22-driven sprocket; 23-chain; 24-driving motor; 25-guide mechanism; 26-sucker rod hook; 30-tool module; 31-tool holder; 32-actuator; 33-clamping piece; 34-cutting knife; 40-storage rack. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The present invention is further explained below in conjunction with specific implementation modes.

[0054] like Figure 1-2 As shown, the present embodiment provides a process equipment for stripping the outer coating layer of a coated sucker rod, comprising: a frame 10, and a conveying device 20 and a tool module 30 arranged on the frame 10. The conveying device 20 is used to carry the coated sucker rod 1 to move in a straight line.

[0055] like Figure 3-4 As shown, the tool module 30 includes: a tool holder 31, an actuator 32, a clamping member 33 (such as a clamping rod or a clamping knife) and a cutting knife 34; two groups of tool modules 30 are symmetrically arranged on both sides of the moving path of the wrapped sucker rod 1; the clamping member 33 and the cutting knife 34 are arranged on the tool holder 31.

[0056] The actuator 32 is used to force the tool holder 31 carrying the clamping member 33 and the cutting knife 34 to approach or move away from the coated sucker rod 1; in the direction approaching the coated sucker rod 1, the end (or top end, one end close to the sucker rod) of the clamping member 33 protrudes from the tip of the cutting knife 34, and when stripping off the coating layer covering the sucker rod 1, the clamping members 33 of the two sets of tool modules 30 clamp the coated sucker rod 1 from both sides, and the cutting knife 34 pierces the coating layer without contacting the metal rod body of the coated sucker rod 1, so as to strip off the sucker rod coating without scratching the metal rod body when the coated sucker rod 1 moves along the moving path and passes through the cutting knife 34.

[0057] Among them, the two clamping members 33 clamp the sucker rod from both sides, which plays a radial limiting role on the sucker rod, preventing the sucker rod from moving radially when the coating is peeled off. At the same time, the protruding cutting knife 34 of the clamping member 33 is set, thereby limiting the cutting knife 34, preventing the cutting knife 34 from contacting the metal rod body of the sucker rod in the radial direction of the sucker rod, thereby protecting the metal rod body.

[0058] In this embodiment, the conveying device 20 is a chain conveying mechanism, including: a driving motor 24, a driving sprocket 21, a driven sprocket 22 and a chain 23. The chain 23 is provided with a sucker rod hook 26 for dragging the covered sucker rod 1. The driving motor 24 drives the chain 23 to move in a circle through the driving sprocket 21. The guide mechanism 25 is located on both sides of the chain 23 to ensure the smooth operation of the chain 23. The chain 23 drags the covered sucker rod 1 through the hook to pass between the two sets of tool modules 30.

[0059] Preferably, the chain 23 is arranged below the covered sucker rod 1, the sucker rod hook 26 is U-shaped, and the opening of the sucker rod hook 26 is arranged away from the chain 23. The sucker rod hook 26 is adapted to the neck of the wrench square (a regular polyhedral end block, used for clamping by a wrench) covering the end of the sucker rod 1, and the neck of the wrench square is inserted into the groove of the hook to achieve the dragging of the sucker rod.

[0060] The chain 23 extends from the feeding side of the tool module 30 to the unloading side. During feeding, the U-shaped hook gradually flips from the bottom of the chain 23 to the top of the chain 23 as the chain 23 moves, and the hook gradually adjusts from the opening downward to the opening upward, thereby automatically hooking the neck of the wrench covering the sucker rod 1 to achieve dragging; during unloading, the hook moves to the unloading side of the tool module 30, and the hook gradually flips from the top of the chain 23 to the bottom of the chain 23 as the chain 23 moves, and the hook gradually adjusts from the opening upward to the opening downward, thereby automatically achieving separation from the neck of the wrench covering the sucker rod 1.

[0061] In addition, the number of hooks is preferably two, and the two hooks are evenly spaced and arranged around the chain 23 to continuously drag and wrap the sucker rod 1 to achieve continuous operation. The number of hooks is two, which can achieve continuous production operation and greatly improve production efficiency; at the same time, combined with the setting of the U-shaped hook, automatic loading and unloading can be achieved.

[0062] The chain 23 is provided with a plurality of support plates arranged at intervals for supporting the wrapped pumping rod 1. The support plates are provided with a limiting structure (such as V-shaped arrangement, trapezoidal groove, etc.), so as to limit the wrapped pumping rod 1 from rolling down.

[0063] A chain track (made of channel steel) is arranged on the frame 10, and a plurality of straightening wheels are arranged on the chain 23. Straightening tracks for guiding the straightening wheels are arranged on both sides of the chain track.

[0064] In addition, the track can also be in other forms, for example, the frame 10 is provided with a track, the track is laid on both sides of the chain 23 and drags the pallet from below. During the loading process, the coated sucker rod 1 is slidably mounted on the track through the pallet, and the coated sucker rod 1 moves more smoothly.

[0065] The cutting knife 34 has a sharp tip for cutting the coating layer covering the sucker rod 1 , and the cutting knife 34 has a wider back for peeling off the coating layer covering the sucker rod 1 .

[0066] like Figure 2 , 3 and Figure 4 As shown, a slide rail 35 is provided on the frame 10, and the slide rail 35 is perpendicular to the moving path of the wrapped sucker rod 1, and the tool holder 31 is slidably provided on the slide rail. The slide rail is a track with a dovetail-shaped cross section, and a slider adapted to the track is provided at the bottom of the tool holder 31, thereby limiting the moving track of the tool holder. The actuator 32 is a cylinder.

[0067] This embodiment further includes a loading device and a unloading device for loading and unloading the coated sucker rod 1; the loading device and the unloading device each include at least one storage rack 40, which is arranged close to the moving path, and in the moving direction of the coated sucker rod 1, the two storage racks are respectively arranged on both sides of the tool module 30. The storage racks of the loading device and the unloading device are respectively used to store the sucker rods that need to be stripped of the coating layer and the sucker rods that have been stripped of the coating layer.

[0068] At least two tool grooves are arranged on the tool holder 31, and the clamping member 33 and the cutting knife 34 are clamped in the tool grooves and fastened by bolts. In this embodiment, the clamping member 33 is a push rod, and the end of the push rod is a smooth arc surface.

[0069] This embodiment also includes a control system, which includes a controller, which is connected to the actuator 32 and is used to control the tool holder 31 to carry the clamping member 33 and the cutting knife 34 to approach or move away from the coated sucker rod 1. Specifically, when the actuator 32 is a cylinder, the control system also includes a control valve (regulating valve), and the controller controls the action of the cylinder or oil cylinder through the control valve to achieve slow forward and fast backward movement of the tool holder 31. When the sucker rod is clamped, the tool slowly approaches the sucker rod to prevent damage to the tool. When the outer coating layer of the coated sucker rod 1 is stripped off, the tool holder 31 quickly gives way to prevent the clamping member 33 and the cutting knife 34 from touching the mushroom head at the end of the sucker rod.

[0070] The frame 10 is made of steel, with a drive motor 24 and a drive sprocket 21 installed at one end; a platform is provided at the other end, a driven sprocket 22 is installed below the platform, a tool module 30 is installed above the platform, and an equipment control switch is set on the platform; a chain 23 track made of channel steel is provided on the frame 10.

[0071] The working principle of the process equipment for stripping the outer coating layer of the coated sucker rod 1 provided by the present invention is as follows:

[0072] The operator hangs the coated sucker rod 1 on the hook of the peeling device, presses the start button of the actuator 32 (cylinder), and the actuator 32 pushes the two knife racks 31 to move, so that the clamping member 33 clamps the metal rod body of the sucker rod, starts the drive motor 24 to run, and the drive sprocket 21 installed at the end of the motor shaft drives the chain 23 to run. The sucker rod hook on the chain 23 pulls the sucker rod to move, and the coating layer of the sucker rod 1 is cut and separated when passing through the cutting knife 34 on the knife rack 31; when the mushroom head at the other end of the coated sucker rod 1 runs to the set position, the actuator 32 controls the knife rack 31 to retract, and the knife rack 31 gives way to avoid the mushroom head. The motor continues to run until the sucker rod automatically detaches from the hook, and the unloading device 41 includes a pneumatic unloading mechanism, which pushes the sucker rod to the storage rack.

[0073] By adopting the above technical solution, the present invention has the following beneficial effects:

[0074] 1. The equipment has a simple and compact structure, is easy to operate, has high safety, and has high production efficiency. It can automatically peel off the coating layer covering the sucker rod 1, thereby achieving the purpose of peeling off the coating layer covering the sucker rod 1.

[0075] 2. The tightening member maintains the gap between the cutting knife 34 and the metal rod body covering the sucker rod 1, so that the metal rod body is not damaged while the covering layer is stripped off.

[0076] 3. A travel switch and a throttle valve are also provided to prevent the tool from colliding with the end of the rod and damaging the rod.

[0077] 4. Two sucker rod hooks can reduce the no-load operation of the motor and achieve continuous production.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process equipment for stripping the outer coating layer of a coated sucker rod, characterized in that: include: A frame, and a conveying device and a tool module arranged on the frame; The conveying device is used to carry the coated sucker rod and move it in a straight line; The tool module comprises: a tool holder, an actuator, a clamping member and a cutting knife; The two groups of the tool modules are symmetrically arranged on both sides of the moving path of the wrapped sucker rod; the clamping member and the cutting knife are arranged on the tool holder; The actuator is used to force the tool holder carrying the clamping member and the cutting knife to approach or move away from the coated sucker rod; in the direction approaching the coated sucker rod, the end of the clamping member protrudes from the tip of the cutting knife, and when stripping off the coating layer covering the sucker rod, the clamping members of the two groups of tool modules clamp the metal rod body of the coated sucker rod from both sides, and the cutting knife pierces the coating layer without contacting the metal rod body of the coated sucker rod, so as to strip off the coating layer of the sucker rod without scratching the metal rod body when the coated sucker rod moves along the moving path and passes through the cutting knife; The conveying device is a chain conveying mechanism, comprising: a driving motor, a driving sprocket, a driven sprocket and a chain; The chain is provided with a hook for dragging the coated sucker rod, the driving motor drives the chain to move cyclically through the driving sprocket, and the chain drags the coated sucker rod through the hook to pass between the two groups of the tool modules; The chain is arranged below the covered sucker rod, the hook is U-shaped, and the opening of the hook is arranged away from the chain.

2. The process equipment according to claim 1, characterized in that: The chain extends from the loading side of the tool module to the unloading side. During loading, the U-shaped hook gradually flips from the bottom of the chain to the top of the chain as the chain moves, and the hook gradually adjusts from the opening downward to the opening upward, thereby automatically hooking the neck of the covered sucker rod wrench to achieve dragging; during unloading, the hook moves to the unloading side of the tool module, and the hook gradually flips from the top of the chain to the bottom of the chain as the chain moves, and the hook gradually adjusts from the opening upward to the opening downward, thereby automatically achieving separation from the neck of the covered sucker rod wrench.

3. The process equipment according to claim 1 or 2, characterized in that: There are two hooks, which are evenly spaced and arranged in the circumferential direction of the chain for continuously dragging the covered sucker rod to achieve continuous operation.

4. The process equipment according to claim 1, characterized in that: The chain is provided with a plurality of support plates arranged at intervals for supporting the coated sucker rod; And / or, a chain track is arranged on the frame, a plurality of straightening wheels are arranged on the chain, and straightening tracks for limiting and guiding the straightening wheels are arranged on both sides of the chain track.

5. The process equipment according to claim 1, characterized in that: The frame is provided with a slide rail, the slide rail is perpendicular to the moving path of the covered sucker rod, and the tool holder is slidably arranged on the slide rail.

6. The process equipment according to claim 1, characterized in that: It also includes a loading device and a unloading device for loading and unloading the coated sucker rod; The loading device and the unloading device each include at least one storage rack, which is arranged close to the moving path. In the moving direction of the coated sucker rod, two storage racks are respectively arranged on both sides of the tool module.

7. The process equipment according to claim 1, characterized in that: The clamping member is a push rod, and the end of the push rod is a smooth arc surface; Alternatively, the clamping member includes a rod body and a clamping wheel, and the clamping wheel is rotatably arranged at the top end of the rod body. When working, the clamping wheel abuts against the metal rod body of the coated sucker rod and rotates with the movement of the coated sucker rod; the end of the clamping member is the part on the outer circumferential surface of the clamping wheel that is closest to the coated sucker rod.

8. The process equipment according to claim 1, characterized in that: It also includes a control system, which includes a controller connected to the actuator and used to control the tool holder to carry the clamping member and the cutting knife to approach or move away from the coated sucker rod.

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