Sucker rod upsetting device

Abstract

The utility model provides a sucker rod upsetting device. The sucker rod upsetting device comprises a conveying support, a heating device, a centralizing cylinder, a rod body thickening and shaping wheel assembly and a pushing wheel assembly. A heating device and a centralizing cylinder are sequentially arranged between the pushing wheel assembly and the rod body thickening and shaping wheel assembly in the conveying direction of the sucker rod, and the heating device is a double-frequency induction heating device and comprises two induction heating coils sequentially arranged in the conveying direction of the sucker rod. The current frequency of the first induction heating coil is larger than that of the second induction heating coil, the rod body thickening and shaping wheel assembly is a three-roller upsetting thrust shaping wheel assembly capable of conducting thickening and shaping on the sucker rod, and the rod body thickening and shaping wheel assembly comprises three rollers which are evenly distributed on the circumference of the sucker rod at 120-degree intervals and operate synchronously. According to the upsetting device, the heating time of the sucker rod can be shortened, and the sucker rod can be effectively supported and fixed in the upsetting process through cooperation of the centralizing cylinder and the rod body thickening and shaping wheel assembly, so that the sucker rod is prevented from being bent or deviated.

Description

Technical Field

[0001] This application relates to the technical field of oil extraction equipment, and particularly to a upsetting device for sucker rods. Background Art

[0002] During the process of oil extraction, sucker rods, as a key downhole tool, their service life and performance directly affect the efficiency and safety of oil extraction. However, sucker rods work in an environment of high pressure, high temperature and corrosive media for a long time, and are prone to problems such as wear, corrosion or fracture. Traditionally, damaged sucker rods are often discarded, resulting in waste of resources and increased treatment costs.

[0003] Existing upsetting devices are mainly used for the processing of new sucker rods. By locally heating and applying pressure, the ends of the sucker rods are thickened to meet special connection requirements. However, for the reuse of old sucker rods, traditional upsetting devices are not applicable. During long-term use, the surface of old sucker rods has been worn and corroded, and the radial dimension has become smaller, resulting in a decline in mechanical properties. There are significant safety hazards in directly reusing these sucker rods, so they usually need to be replaced or discarded.

[0004] To solve the above problems, methods for locally reinforcing or repairing old sucker rods have gradually emerged in the market, such as welding repair or surface coating technology. However, these methods often have problems of complex processes and unstable repair effects. Content of the Utility Model

[0005] To solve the problem that the existing upsetting device is not applicable to the upsetting processing of old sucker rods, this application provides a sucker rod upsetting device, which can thicken the whole old sucker rod to realize the reuse of resources.

[0006] To solve the above technical problems, this application adopts the following technical solutions:

[0007] A sucker rod upsetting device includes a conveying support, a heating device, a centering cylinder, a rod body thickening and shaping wheel assembly and a feeding wheel assembly;

[0008] A pusher wheel assembly for conveying the sucker rod to the rod body thickening and shaping wheel assembly is provided on the conveying bracket. An electric heating device and a centering cylinder are sequentially arranged between the pusher wheel assembly and the rod body thickening and shaping wheel assembly along the conveying direction of the sucker rod. The electric heating device is a dual-frequency induction heating device, which includes a first induction heating coil and a second induction heating coil arranged sequentially along the conveying direction of the sucker rod. The current frequency of the first induction heating coil is greater than that of the second induction heating coil. The centering cylinder is located between the electric heating device and the rod body thickening and shaping wheel assembly. A bracket is provided at the bottom end of the centering cylinder, and the centering cylinder is installed on the conveying bracket through the bracket. The rod body thickening and shaping wheel assembly is a three-roll upsetting and thrust shaping wheel assembly capable of thickening and shaping the sucker rod. The rod body thickening and shaping wheel assembly includes three synchronously running rollers evenly distributed at 120° intervals around the circumference of the sucker rod.

[0009] In an alternative embodiment, the pusher wheel assembly includes two driving wheels and two driven wheels. The two driving wheels are located above the sucker rod and are driven by a power source to rotate synchronously. The two driven wheels are located below the sucker rod and are symmetrically distributed with the two driving wheels. The sucker rod is between the two driving wheels and the two driven wheels during conveyance.

[0010] In an alternative embodiment, the outer surface of the driving wheel is covered with a hard rubber layer.

[0011] In an alternative embodiment, the hard rubber layer is neoprene or polyurethane rubber.

[0012] In an alternative embodiment, the first induction heating coil is an ultra-audio-frequency induction heating coil or a high-frequency induction heating coil, and the second induction heating coil is an intermediate-frequency induction heating coil.

[0013] In an alternative embodiment, a temperature sensor is further included and installed between the first induction heating coil and the second induction heating coil for monitoring the surface temperature of the sucker rod after being heated by the first induction heating coil. The type of the temperature sensor is a non-contact infrared temperature sensor.

[0014] In an alternative embodiment, the roller is a cylindrical and conical composite structure, which includes a cylindrical section and a conical section. The large bottom surface side of the conical section is integrally connected to the cylindrical section to form a continuous overall structure. The transition between the conical section and the cylindrical section is smooth. The conical section is located on the side biased towards the centering cylinder.

[0015] In an alternative embodiment, the centering cylinder is a cylindrical hollow cylinder structure, and a lining layer is provided on the inner wall of the centering cylinder.

[0016] In an alternative embodiment, the inner lining layer is installed on the inner wall of the centralizing cylinder in an embedded manner, and the material of the inner lining layer is alumina ceramic.

[0017] This application proposes an improved upsetting device for sucker rods. Through innovative design, it can achieve the overall thickening of old sucker rods. By heating the sucker rods as a whole and applying uniform pressure, the old sucker rods can be better restored to a state close to that of new rods during the thickening process. This device can not only extend the service life of old sucker rods, but also significantly reduce the material cost and waste treatment cost during oil extraction, realizing the reuse of resources, and has important practical application value. Specifically, this application has the following beneficial effects:

[0018] 1. Through the synergistic effect of induction heating and the rod body thickening and shaping wheel assembly, this application can thicken the old sucker rods as a whole under the condition of uniform heating, thereby increasing their radial dimensions, enabling the old sucker rods to be restored to a state close to that of new rods to a large extent during the thickening process, significantly improving their mechanical strength and fatigue resistance, meeting the requirements for further use or hot drawing and repair processing, and avoiding the problem of abandonment caused by wear and corrosion;

[0019] 2. This application provides an upsetting device for sucker rods, including a conveying bracket, a heating device, a centralizing cylinder, a rod body thickening and shaping wheel assembly, and a pusher wheel assembly. The heating device is a dual-frequency induction heating device, which includes a first induction heating coil and a second induction heating coil arranged in sequence along the conveying direction of the sucker rod. This application uses the induction heating method combined with the first induction heating coil and the second induction heating coil for heating. The current frequency of the first induction heating coil is relatively high, which can quickly heat the surface of the sucker rod to make it quickly reach the initial processing temperature. The second induction heating coil is used to ensure that the temperature inside and outside the rod body is consistent during the heating process, so as to make the rod body heated evenly, improve the processing accuracy, and this heating method is more efficient than the traditional external flame heating, avoiding the processing delay caused by uneven heating and significantly shortening the overall heating time;

[0020] 3. This application adopts the cooperative design of the centralizing cylinder, the rod body thickening and shaping wheel assembly, and the pusher wheel assembly. During use, the pusher wheel assembly can quickly and smoothly convey the sucker rod to the heating and upsetting area, reducing the waiting time. Moreover, through the cooperation of the centralizing cylinder and the rod body thickening and shaping wheel assembly, the sucker rod can be effectively supported and fixed during the upsetting process to prevent it from bending or shifting. By ensuring the straightness of the sucker rod during the processing, this device reduces the situations of re-calibration or processing failure due to rod body bending, improves the continuity and stability of processing, and improves the overall processing efficiency;

[0021] 4. The rod thickening and shaping wheel assembly adopted in this application is a three-roll upsetting and thrust shaping wheel assembly capable of thickening and shaping the sucker rod. The rod thickening and shaping wheel assembly includes three synchronously operating rollers evenly distributed at 120° intervals around the circumference of the sucker rod. With this three-roll structure of the thickening and shaping wheel design, a uniform radial pressure can be exerted on the sucker rod, causing uniform deformation. This multi-roll structure can apply pressure more efficiently than the traditional single-roll or double-roll design, ensuring rapid and uniform upsetting processing and greatly shortening the processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Structural schematic diagram of the sucker rod upsetting device provided by an embodiment of the present application;

[0024] Figure 2 Distribution schematic diagram of the three rollers of the rod thickening and shaping wheel assembly provided by an embodiment of the present application outside the sucker rod;

[0025] Figure 3 Structural schematic diagram of the roller provided by an embodiment of the present application.

[0026] Reference numerals:

[0027] 100, transfer bracket; 200, heating device; 210, first induction heating coil; 220, second induction heating coil; 300, centering cylinder; 400, rod thickening and shaping wheel assembly; 410, roller; 411, cylindrical section; 412, frustum section; 500, pusher wheel assembly; 510, driving wheel; 520, driven wheel; 600, sucker rod; 700, bracket; 800, temperature sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following clearly and completely describes the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts also belong to the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0030] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] Traditional upsetting devices for sucker rods have low efficiency in upsetting processing and are prone to bending and deforming the sucker rods. Traditional upsetting devices usually use external flames or simple resistance heating equipment. This heating method results in a large temperature difference between the surface and the interior of the sucker rod, which easily causes uneven heating, increases the processing difficulty, and requires more time to make the entire sucker rod reach a temperature suitable for upsetting. When pressure is applied under such uneven temperature conditions, different parts of the rod body will deform at different rates, resulting in bending. In addition, the support and fixation of the sucker rod by traditional upsetting devices are not stable enough. Especially during the heating and pressure application processes, the sucker rod is prone to bending or shifting, which not only leads to a decrease in processing accuracy but also may cause multiple adjustments or rework, prolonging the processing time. Moreover, due to the simple mechanical structure of traditional upsetting equipment, the force applied to the sucker rod during the upsetting process is uneven, and it is easy to have the phenomenon of excessive or insufficient local force. The rod body will lose its axial straightness and gradually bend. At the same time, due to the single function of the equipment, traditional upsetting devices often cannot complete continuous processing steps and need to be carried out separately in multiple processes, which leads to the complexity of operation and waste of time, and the overall efficiency is low.

[0033] As Figures 1-3 shown, an embodiment of the present application provides a sucker rod upsetting device, including a conveying support 100, a heating device 200, a centralizing cylinder 300, a rod body thickening and shaping wheel assembly 400, and a material pushing wheel assembly 500.

[0034] Among them, the conveying bracket 100 is used to carry and convey the sucker rod 600. In order to efficiently and smoothly convey the sucker rod 600, a pusher wheel assembly 500 for conveying the sucker rod 600 to the rod body thickening and shaping wheel assembly 400 is arranged on the conveying bracket 100. A heating device 200 and a straightening cylinder 300 are arranged in sequence between the pusher wheel assembly 500 and the rod body thickening and shaping wheel assembly 400 according to the conveying direction of the sucker rod 600. The heating device 200 is a dual-frequency induction heating device. The heating device 200 includes a first induction heating coil 210 and a second induction heating coil 220 which are arranged in sequence along the conveying direction of the sucker rod 600. The first induction heating coil 210 and the second induction heating coil 220 are distributed at different positions of the sucker rod. The current frequency of the first induction heating coil 210 is greater than the current frequency of the second induction heating coil 220. In practical applications, the heating power thereof can be adjusted to ensure that the sucker rod 600 maintains a suitable temperature during the upsetting process. The straightening cylinder 300 is located between the heating device 200 and the rod thickening and shaping wheel assembly 400, and is used to support and fix the sucker rod 600 to prevent it from deflecting and bending during processing. A bracket 700 is provided at the bottom end of the straightening cylinder 300, and the straightening cylinder 300 is installed on the conveying bracket 100 through the bracket 700. The rod thickening and shaping wheel assembly 400 is a three-roller roughening thrust shaping wheel assembly that can thicken and shape the sucker rod 600. Figure 2 As shown, the rod thickening and shaping wheel assembly 400 includes three synchronously operating rollers 410 evenly distributed at intervals of 120 degrees around the circumference of the sucker rod 600.

[0035] The sucker rod upsetting device of the embodiment of the present application, through the synergistic effect of induction heating and the rod thickening and shaping wheel assembly 400, can make the old sucker rod be overall thickened under the condition of uniform heating, thereby increasing its radial dimension, so that the old sucker rod can be restored to a state close to that of a new rod to a large extent during the thickening process, significantly improving its mechanical strength and fatigue resistance, meeting the requirements for further use or hot drawing repair processing, and avoiding the problem of abandonment due to wear and corrosion.

[0036] The upsetting device for sucker rods provided by the embodiments of the present application includes a conveying support 100, a heating device 200, a centering cylinder 300, a rod body thickening and shaping wheel assembly 400, and a feeding wheel assembly 500. The heating device 200 is a dual-frequency induction heating device, which includes a first induction heating coil 210 and a second induction heating coil 220 arranged in sequence along the conveying direction of the sucker rod 600. The present application uses the induction heating method combined with the first induction heating coil 210 and the second induction heating coil 220 for heating. The current frequency of the first induction heating coil 210 is relatively high, which can quickly heat the surface of the sucker rod 600 to rapidly reach the initial processing temperature. The second induction heating coil 220 is used to ensure that the temperature inside and outside the rod body is consistent during the heating process, so as to make the rod body heated evenly, improve the processing accuracy, and this heating method is more efficient than the traditional external flame heating, avoiding the processing delay caused by uneven heating and significantly shortening the overall heating time.

[0037] The embodiments of the present application adopt the cooperative design of the centering cylinder 300, the rod body thickening and shaping wheel assembly 400, and the feeding wheel assembly 500. During use, the feeding wheel assembly 500 can quickly and smoothly convey the sucker rod 600 to the heating and upsetting areas, reducing the waiting time. Moreover, through the cooperation of the centering cylinder 300 and the rod body thickening and shaping wheel assembly 400, the sucker rod 600 can be effectively supported and fixed during the upsetting process to prevent it from bending or offsetting. By ensuring the straightness of the sucker rod 600 during the processing, the device reduces the situations of re-calibration or processing failure due to rod body bending, improves the continuity and stability of processing, and improves the overall processing efficiency.

[0038] The rod body thickening and shaping wheel assembly 400 adopted by the embodiments of the present application is a three-roller upsetting thrust shaping wheel assembly capable of thickening and shaping the sucker rod 600. The rod body thickening and shaping wheel assembly 400 includes three synchronously running rollers evenly distributed at 120° intervals around the circumference of the sucker rod 600. Adopting this three-roller structure for the thickening and shaping wheel design can apply uniform radial pressure to the sucker rod 600, so as to deform it evenly. This multi-roller structure can apply pressure more efficiently than the traditional single-roller or double-roller design, ensuring rapid and uniform upsetting processing and greatly shortening the processing cycle.

[0039] In some embodiments, the feeding wheel assembly 500 includes two driving wheels 510 and two driven wheels 520. The two driving wheels 510 are located above the sucker rod 600 and are driven by a power source to rotate synchronously. The two driven wheels 520 are located below the sucker rod 600 and are symmetrically distributed with the two driving wheels 510. The sucker rod 600 is located between the two driving wheels 510 and the two driven wheels 520 during conveyance.

[0040] In some embodiments, the outer surface of the driving wheel 510 is covered with a hard rubber layer to increase the friction force.

[0041] The hard rubber layer on the outer surface of the driving wheel 510 plays an important role in the pusher wheel assembly. It ensures the stable advancement of the sucker rod 600 during the processing by increasing the friction force. Specifically, the hard rubber layer is coated on the outer surface of the driving wheel 510, which can ensure that sufficient friction force is generated when the driving wheel 510 contacts the sucker rod 600. This friction force can not only effectively prevent the sucker rod 600 from sliding or skidding during the processing, but also make the thrust be transmitted to the sucker rod 600 more evenly to ensure its stable advancement. Moreover, compared with metal materials, hard rubber has better elasticity and flexibility, which can reduce the damage to the surface of the sucker rod 600 while maintaining high friction force, effectively avoiding the problems of scratches or deformation caused by the direct contact between the driving wheel 510 and the metal surface of the sucker rod 600.

[0042] In some embodiments, the hard rubber layer is made of neoprene or polyurethane rubber. The hard rubber layer made of neoprene or polyurethane rubber has good wear resistance, tear resistance and aging resistance, and can maintain its performance during high-intensity pushing operations. The hardness of the hard rubber layer can be adjusted and designed according to the processing requirements. It is usually medium-high hardness to ensure that it provides sufficient friction force without being too soft to affect the pusher effect. The typical hardness range is Shore hardness A60 to A90. In addition, during the upsetting process, the sucker rod 600 may be in a high-temperature state. The hard rubber material has good high-temperature resistance and can maintain its physical properties at a relatively high temperature. Moreover, hard rubber also has oil resistance and chemical corrosion resistance, and can cope with the influence of lubricating oil or other chemicals that may appear in the production environment.

[0043] In some embodiments, the first induction heating coil 210 is an ultra-audio frequency induction heating coil or a high-frequency induction heating coil, and the second induction heating coil 220 is an intermediate-frequency induction heating coil.

[0044] In the embodiment of the present application, a design is adopted in which the first induction heating coil 210 is a super-audio induction heating coil or a high-frequency induction heating coil, and the second induction heating coil 220 is an intermediate-frequency induction heating coil. Such a design has significant advantages in the actual upsetting process of sucker rods. Induction heating is a method of heating a workpiece by generating eddy currents on the surface of the workpiece. When an electric current passes through the induction coil, electromagnetic induction will be generated inside the workpiece, and then eddy currents are formed. Due to the resistance effect, the eddy currents are converted into heat, causing the workpiece to rapidly heat up. In this embodiment, a super-audio induction heating coil or a high-frequency induction heating coil is used as the first induction heating coil 210. The induction heating of high-frequency or super-audio current (usually above 50 kHz) mainly acts on the shallow layer of the surface of the workpiece, and can quickly heat the surface area. Due to the relatively high frequency, the penetration depth of the eddy current is small, which is suitable for surface heating and rapid temperature rise of the workpiece; while an intermediate-frequency induction heating coil is used as the second induction heating coil 220, and the induction heating of intermediate-frequency current (usually in the range of several hundred Hz to several kHz) can generate deeper eddy currents and has a deeper penetration ability, which is suitable for heating thicker workpieces or occasions where heating to a deeper level of the workpiece is required, and can uniformly heat the entire workpiece over a long period of time.

[0045] The heating device 200 adopted in the embodiment of the present application can achieve staged heating. Setting the high-frequency or super-audio heating coil as the first heating stage helps to rapidly increase the temperature of the surface of the sucker rod. Such a design can shorten the preheating time and ensure that the surface temperature of the sucker rod quickly reaches the processing requirements before entering the upsetting station; after the surface is heated in the first stage, the sucker rod is heated by the intermediate-frequency heating coil. Intermediate-frequency heating can make the heat penetrate to the deep layer of the sucker rod to achieve uniform overall heating. This is very important for the subsequent upsetting process, because uniform heating can avoid deformation or cracks of the sucker rod caused by excessive temperature difference between the inside and outside.

[0046] During the upsetting process, the plastic deformation of the sucker rod has strict requirements on the temperature distribution of the material. By using induction heating coils with different frequencies, the heating speed and depth from the surface to the inside of the workpiece can be effectively controlled, avoiding problems such as overheating or uneven heating that may be caused by using only a single frequency for heating. Moreover, first using a high-frequency or super-audio heating coil to heat the surface, and then using an intermediate-frequency heating coil to heat the deep layer of the workpiece ensures that the workpiece has sufficient surface temperature to meet the requirements of the upsetting process, while also ensuring the temperature uniformity inside the workpiece. In addition, staged heating can also avoid heat loss caused by too long a single heating method, thereby improving the energy utilization rate.

[0047] In some embodiments, the upsetting device for sucker rods according to the embodiments of the present application further includes a temperature sensor 800 installed between the first induction heating coil 210 and the second induction heating coil 220, which is used to monitor the surface temperature of the sucker rod 600 after being heated by the first induction heating coil 210. The type of the temperature sensor 800 is a non-contact infrared temperature sensor.

[0048] In this embodiment, to ensure the accuracy of the heating process, a temperature sensor 800 can be installed in the position area of the sucker rod transmission path between the first induction heating coil 210 and the second induction heating coil 220 to monitor the temperature change of the sucker rod 600 in real time and ensure that the heating process meets the process requirements. In practical applications, an intelligent temperature control system can be used to adjust the current intensity and working time of the heating coil according to the real-time temperature data to optimize the heating effect. The temperature sensor 800 is set at the position between the first induction heating coil 210 and the second induction heating coil 220, which can not only accurately monitor the surface temperature of the sucker rod 600 after being heated by the first heating coil (high frequency or super audio frequency), but also provide a reference for the heating adjustment of the second heating coil (medium frequency). The temperature data at this position helps the temperature control system determine whether it is necessary to adjust the heating intensity or time of the second heating coil to ensure uniform heating of the sucker rod inside and outside.

[0049] Furthermore, the type of the temperature sensor 800 is a non-contact infrared temperature sensor to avoid affecting the service life and accuracy of the sensor due to direct contact with the workpiece. Since it does not need to be in direct contact with the workpiece, it can maintain stable working performance in a high-temperature environment. When installing the temperature sensor 800, the temperature sensor 800 can be fixed on the mechanical structure between the two induction heating coils through a mounting bracket. The mounting bracket should be made of high-temperature resistant and corrosion-resistant materials to adapt to the high-temperature environment of the heating area. If a higher temperature accuracy is required, multiple temperature sensors can be considered to be installed between the two induction heating coils to monitor the temperatures of different positions of the sucker rod 600 respectively. For example, a temperature sensor can be set at each of the upper, lower, left, and right positions of the sucker rod to further improve the accuracy of the temperature data.

[0050] In some embodiments, the roller 410 has a compound structure of a cylinder and a frustum, such as Figure 3 shown, the roller 410 includes a cylindrical section 411 and a frustum section 412. One side of the large bottom surface of the frustum section 412 is integrally connected to the cylindrical section 411 to form a continuous integral structure. There is a smooth transition between the frustum section 412 and the cylindrical section 411, such as Figure 1As shown, the frustum section 412 is located on one side of the centering cylinder 300. The column and frustum composite structure of the roller 410 in the embodiment of the present application is a key structural design for precisely plastically deforming the workpiece during upsetting. This structure includes a cylindrical section 411 and a frustum section 412. Through the synergistic effect of these two structural sections with different shapes, effective thickening of the sucker rod 600 can be achieved.

[0051] Among them, the cylindrical section 411 is the main working area of the roller and has a uniform cylindrical outer surface. This section is mainly used to apply a uniform radial pressure to the sucker rod 600 to ensure that regular and stable plastic deformation can occur when the rod passes through the roller. Since the cylindrical section 411 has a uniform surface, its contact with the sucker rod 600 is very stable, and it can maintain continuous and uniform frictional force and pressure throughout the processing, ensuring that the thickening effect on the rod surface is consistent; the frustum section 412 is conical (frustum-shaped), and its diameter gradually changes from small to large. The main function of the frustum section 412 is to achieve transitional plastic deformation and help the workpiece gradually transition from a smaller diameter to the target thickened diameter. The design of the frustum section 412 can effectively reduce the stress concentration phenomenon generated during the thickening process of the workpiece, ensure a smooth transition process from a smaller diameter to a larger diameter, and avoid obvious contact marks or surface defects.

[0052] During use, when the sucker rod 600 enters the rod thickening and shaping wheel assembly 400, the rod first contacts the frustum section 412 of the roller 410. At this time, the conical surface of the frustum section 412 gradually applies pressure to the rod, causing the rod to start plastic deformation and its diameter to gradually increase. As the rod continues to advance forward, the cylindrical section 411 begins to contact it and applies a uniform radial pressure to ensure that the rod is finally thickened to the required size. During the processing of the rod, the column and frustum composite structure combines the progressive force application of the frustum section 412 and the uniform pressure of the cylindrical section 411 to achieve balanced force application to the sucker rod 600. This structural design can effectively reduce the local stress concentration that occurs during the processing, ensure uniform force on the rod, and smooth deformation effect. Moreover, the design of the composite structure allows the sucker rod 600 to maintain continuous plastic deformation when entering and leaving the roller 410, which not only improves the processing efficiency but also reduces the need for secondary trimming of the workpiece.

[0053] In some embodiments, the centering cylinder 300 is a cylindrical hollow cylinder structure for supporting and fixing the sucker rod 600 to prevent it from shifting and bending during processing. An inner lining layer is provided on the inner wall of the centering cylinder 300. In this embodiment, the setting of the inner lining layer can effectively protect the centering cylinder 300, reduce the impact of direct friction on it, and extend the service life of the cylinder body of the centering cylinder 300.

[0054] In some embodiments, the inner lining layer is installed on the inner wall of the centralizer 300 in an embedded manner to ensure close bonding between the inner lining layer and the inner wall of the centralizer 300 and maintain stability during long-term use. The material of the inner lining layer is alumina ceramic to ensure high temperature resistance and wear resistance.

[0055] In this embodiment, using alumina ceramic as the material of the inner lining layer of the centralizer 300 is a very suitable choice, especially in high-temperature, friction, and corrosion environments. Alumina ceramic has excellent high-temperature resistance, outstanding wear resistance, corrosion resistance, low friction coefficient, and small thermal expansion coefficient, which can meet the usage requirements of the centralizer 300 in harsh environments. When the sucker rod 600 passes through the centralizer 300, the inner lining layer can reduce the friction coefficient to ensure the smooth movement of the sucker rod and avoid wear or deformation caused by excessive friction inside the centralizer 300. Since the inner lining layer directly contacts the tool and bears the friction, it needs to be regularly inspected and maintained during use.

[0056] In summary, the sucker rod upsetting device of the embodiment of the present application includes a conveying bracket 100, a heating device 200, a centralizer 300, a rod body thickening and shaping wheel assembly 400, and a feeding wheel assembly 500. By reasonably configuring the heating device 200 and the rod body thickening and shaping wheel assembly 400, and setting the centralizer 300 and the feeding wheel assembly 500, it can ensure uniform heating of the sucker rod during the upsetting process and avoid bending of the rod body, greatly improving the processing efficiency.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A upsetting device for sucker rods, characterized in that, It includes a conveying bracket (100), a heating device (200), a centralizing cylinder (300), a rod body thickening and shaping wheel assembly (400) and a feeding wheel assembly (500); A feeding wheel assembly (500) for conveying the sucker rod (600) to the rod body thickening and shaping wheel assembly (400) is arranged on the conveying bracket (100). The heating device (200) and the centralizing cylinder (300) are sequentially arranged between the feeding wheel assembly (500) and the rod body thickening and shaping wheel assembly (400) according to the conveying direction of the sucker rod (600). The heating device (200) is a dual-frequency induction heating device. The heating device (200) includes a first induction heating coil (210) and a second induction heating coil (220) sequentially arranged along the conveying direction of the sucker rod (600). The current frequency of the first induction heating coil (210) is greater than that of the second induction heating coil (220). The centralizing cylinder (300) is located between the heating device (200) and the rod body thickening and shaping wheel assembly (400). A bracket (700) is arranged at the bottom end of the centralizing cylinder (300). The centralizing cylinder (300) is installed on the conveying bracket (100) through the bracket (700). The rod body thickening and shaping wheel assembly (400) is a three-roll upsetting and thrust shaping wheel assembly capable of thickening and shaping the sucker rod (600). The rod body thickening and shaping wheel assembly (400) includes three synchronously running rollers (410) evenly distributed at 120° intervals around the circumference of the sucker rod (600).

2. The upsetting device for sucker rods according to claim 1, characterized in that, The feeding wheel assembly (500) includes two driving wheels (510) and two driven wheels (520). The two driving wheels (510) are located above the sucker rod (600) and are driven by a power source to rotate synchronously. The two driven wheels (520) are located below the sucker rod (600) and are symmetrically distributed with the two driving wheels (510). The sucker rod (600) is between the two driving wheels (510) and the two driven wheels (520) during conveying.

3. The upsetting device for sucker rods according to claim 2, characterized in that, The outer surface of the driving wheel (510) is covered with a hard rubber layer.

4. The upsetting device for sucker rods according to claim 3, characterized in that, The hard rubber layer is neoprene or polyurethane rubber.

5. The upsetting device for sucker rods according to any one of claims 1-4, characterized in that, The first induction heating coil (210) is an ultra-audio frequency induction heating coil or a high-frequency induction heating coil, and the second induction heating coil (220) is an intermediate-frequency induction heating coil.

6. The upsetting device for sucker rod according to claim 5, characterized in that, It further includes a temperature sensor (800) installed between the first induction heating coil (210) and the second induction heating coil (220) for monitoring the surface temperature of the sucker rod (600) after being heated by the first induction heating coil (210). The type of the temperature sensor (800) is a non-contact infrared temperature sensor.

7. The upsetting device for sucker rod according to claim 5, wherein The roller (410) has a compound structure of a cylinder and a frustum. The roller (410) includes a cylindrical section (411) and a frustum section (412). One side of the large bottom surface of the frustum section (412) is integrally connected to the cylindrical section (411) to form a continuous integral structure. There is a smooth transition between the frustum section (412) and the cylindrical section (411). The frustum section (412) is located on the side biased towards the centralizer (300).

8. The upsetting device for sucker rod according to claim 5, wherein The centralizer (300) has a cylindrical hollow cylinder structure, and a lining layer is provided on the inner wall of the cylinder of the centralizer (300).

9. The upsetting device for sucker rod according to claim 8, characterized in that, The lining layer is installed on the inner wall of the cylinder of the centralizer (300) in an embedded manner, and the material of the lining layer is alumina ceramic.

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