Sucker rod preheating device

Abstract

The utility model provides a sucker rod preheating device which comprises a preheating furnace, a heating device, a heating device and a control device. The preheating furnace is oppositely provided with a feeding port and a discharging port. The multiple preheating assemblies are arranged in the preheating furnace at equal intervals, each preheating assembly comprises two preheating units which are vertically arranged at an interval of a first preset distance, and the preheating units are used for preheating the sucker rods entering the preheating furnace; the rotary conveying assembly is used for rotationally inputting the sucker rod into the preheating furnace from the feeding opening and rotationally outputting the sucker rod out of the preheating furnace from the discharging opening; the first rotary conveying units are close to the feeding port and the discharging port respectively and are arranged outside the preheating furnace, and the second rotary conveying units are arranged between every two adjacent preheating assemblies. According to the device, the temperature of the peripheral wall of the preheated sucker rod is uniform, so that the preheating uniformity of the sucker rod is improved, molding powder sprayed to the preheated sucker rod can be quickly cured, and the molding powder curing efficiency and the plastic spraying quality of the sucker rod are improved.

Description

Technical Field

[0001] The present application relates to the technical field of sucker rods, and in particular to a sucker rod preheating device. Background Art

[0002] The sucker rod is a slender rod of the pumping well. It is connected to the bare rod at the top and the pump at the bottom. It mainly plays the role of transmitting power. In order to avoid the corrosion of the sucker rod by the harsh oil well environment, the sucker rod needs to be sprayed with plastic during the production process of the sucker rod. In order to make the plastic powder sprayed on the wall of the sucker rod solidify quickly (the solidification temperature is 180-220℃), the sucker rod needs to be preheated before being sprayed with plastic during the production process of the sucker rod.

[0003] Since high-frequency induction heating equipment has a high heating efficiency, the existing sucker rod preheating device usually uses high-frequency induction heating equipment to preheat the sucker rod. Specifically, a high-frequency current is provided to the high-frequency induction heating equipment through a power supply. The high-frequency current generates a magnetic field in the induction coil. The magnetic field generated by the induction coil causes eddy currents on the surface of the sucker rod, and the eddy currents quickly heat the surface of the sucker rod to the required temperature. However, the above heating method may have problems such as uneven magnetic field strength (especially when using a single-winding or double-winding inductor, the temperature of the edge and the center will show obvious unevenness) and uneven current distribution (especially at high frequencies, the distribution of current in the cross section of the workpiece is more complex and uneven, and this uneven current distribution will lead to uneven temperature during the heating process), etc., resulting in uneven temperature of the preheated sucker rod, poor curing effect of the local plastic powder sprayed on the sucker rod, reduced preheating effect and spraying effect of the sucker rod, and poor quality of the finished sucker rod. Utility Model Content

[0004] The present application provides a sucker rod preheating device to solve the technical problems described in the above background technology.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] The present application provides a sucker rod preheating device, comprising:

[0007] A preheating furnace, wherein a feed inlet and a discharge outlet are provided on the preheating furnace;

[0008] A plurality of preheating assemblies, wherein the plurality of preheating assemblies are arranged in the preheating furnace at equal intervals, each of the preheating assemblies comprises two preheating units arranged at a first preset distance from top to bottom, and the preheating units are used to preheat the sucker rods entering the preheating furnace;

[0009] A rotating conveying assembly is used to rotate the sucker rod from the feed port into the preheating furnace and rotate it out of the preheating furnace from the discharge port, and it includes two first rotating conveying units arranged outside the preheating furnace close to the feed port and the discharge port respectively, and a second rotating conveying unit arranged between each adjacent two preheating assemblies.

[0010] Optionally, the feed port and the discharge port are arranged relative to each other along the length direction of the preheating furnace.

[0011] Optionally, each of the preheating units includes a heat conducting plate, a plurality of limit strips and a plurality of resistance wires;

[0012] A plurality of the limit bars are arranged at equal intervals on the heat conducting plate, a resistance wire is arranged between each two adjacent limit bars, the heat conducting plate is connected to the inner top or inner bottom of the preheating furnace through a connecting piece, and the limit bars and the resistance wire are distributed along the length direction of the preheating furnace.

[0013] Optionally, the heat conducting plate is provided with a plurality of rows of fixing holes, and the plurality of rows of fixing holes correspond one-to-one to the plurality of limiting strips;

[0014] Each row of the fixing holes comprises a plurality of first through holes arranged at equal intervals, and each of the limiting strips is provided with a plurality of second through holes which correspond to the plurality of first through holes in each row of the fixing holes at equal intervals along its length direction;

[0015] One end of the connecting member passes through the first through hole and the second through hole, and the top end of the connecting member is connected to the inner top surface of the preheating furnace or the bottom end of the connecting member is connected to the inner bottom surface of the preheating furnace.

[0016] Optionally, there are multiple connecting members, and each connecting member corresponds to one first through hole and one second through hole;

[0017] The connecting piece includes an insert rod and a support plate;

[0018] The insertion rod passes through the first through hole and the second through hole, the middle part of the support plate is arranged on the insertion rod and is used to support the heat conducting plate, the top end of the insertion rod is fixedly connected to the inner top surface of the preheating furnace or the bottom end of the insertion rod is fixedly connected to the inner bottom surface of the preheating furnace.

[0019] Optionally, each of the resistance wires is wavy.

[0020] Optionally, each of the limiting strips is made of heat-conducting material.

[0021] Optionally, the first preset distance is greater than the diameter of the rod head of the sucker rod.

[0022] Optionally, each of the first rotating conveying units includes a support frame, a plurality of first rotating shafts, and a plurality of first rollers sequentially sleeved on each of the first rotating shafts;

[0023] A plurality of first rotating shafts are arranged on the support frame at equal intervals and both ends of each first rotating shaft are rotatably connected to the support frame, an angle is set between each first rotating shaft and two opposite inner walls of the support frame, a plurality of first rollers are sequentially sleeved on the first rotating shafts, a first rolling groove is set in the middle part of each first roller along its circumference, a sprocket is sleeved on each first rotating shaft, and a plurality of sprockets are connected by chains.

[0024] Optionally, each of the second rotating conveying units includes a second rotating shaft and a plurality of second rollers;

[0025] Both ends of the second rotating shaft are rotatably arranged on the two side walls in the width direction of the preheating furnace, and the angle is arranged between the second rotating shaft and the inner side wall of the preheating furnace. A plurality of second rollers are sequentially sleeved on the second rotating shaft, and a second rolling groove is arranged in the middle part of each second roller along its circumference.

[0026] The sucker rod preheating device provided in the present application rotates and conveys the sucker rod from a feed port to a preheating furnace through a first rotating conveying unit. The sucker rod entering the preheating furnace passes between two preheating units spaced apart by a first preheating distance around its own axis under the action of a second rotating conveying unit. Since the sucker rod is rotationally conveyed to the preheating furnace and rotationally conveyed in the preheating furnace and is rotationally output from the discharge port under the action of the second rotating conveying unit, that is, the entire conveying process of the sucker rod in the preheating furnace is rotationally conveyed around its own axis, so that the outer peripheral wall of the sucker rod can evenly receive the heat radiated by the preheating units arranged above and below it in the preheating furnace, so that the temperature of the outer peripheral wall of the preheated sucker rod is uniform, thereby improving the uniformity of the preheating of the sucker rod, and allowing the plastic powder sprayed on the preheated sucker rod to solidify quickly, thereby improving the efficiency of plastic powder solidification and the spraying quality of the sucker rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the top view of the sucker rod preheating device provided in one embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of a preheating assembly provided in one embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of a preheating unit provided in one embodiment of the present application;

[0031] Figure 4 A schematic diagram of the structure of a heat conducting plate provided in one embodiment of the present application;

[0032] Figure 5 A schematic structural diagram of a sucker rod provided in one embodiment of the present application.

[0033] In the figure: 100, preheating furnace; 101, feed port; 102, discharge port; 200, preheating assembly; 201, preheating unit; 2011, heat conduction plate; 2012, limit strip; 2013, resistance wire; 300, sucker rod; 400, rotating conveying assembly; 401, first rotating conveying unit; 4011, support frame; 4012, first rotating shaft; 4013, first roller; 402, second rotating conveying unit; 4021, second rotating shaft; 4022, second roller; 500, connecting piece; 501, plug rod; 502, support plate; 600, fixing hole; 601, first through hole; 602, second through hole; 700, first rolling groove; 800, chain; 900, second rolling groove. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0035] refer to Figures 1 to 5 The present application provides a sucker rod preheating device, comprising:

[0036] The preheating furnace 100 has a feed port 101 and a discharge port 102 formed thereon. The sucker rod 300 enters the preheating furnace 100 through the feed port 101 and is preheated by the preheating furnace 100. The preheated sucker rod 300 exits the preheating furnace 100 through the discharge port 102 to obtain the preheated sucker rod 300.

[0037] A plurality of preheating assemblies 200 are arranged at equal intervals in the preheating furnace 100, each preheating assembly 200 includes two preheating units 201 arranged at a first preset distance from top to bottom, and the preheating unit 201 is used to preheat the sucker rod 300 entering the preheating furnace 100; wherein, the plurality of preheating assemblies 200 are distributed at equal intervals along the length direction of the preheating furnace 100, so that the preheating efficiency of the plurality of preheating assemblies 200 on the sucker rod 300 entering the preheating furnace 100 can be improved, and the number of preheating assemblies 200 can be set according to the size of the preheating furnace 100, etc., therefore, the present application does not make specific restrictions on it here. In addition, the first preset distance can be set according to actual needs, therefore, the present application does not make specific restrictions on it here.

[0038] The rotating conveying assembly 400 is used to rotate the sucker rod 300 from the feed port 101 into the preheating furnace 100 and rotate it out of the preheating furnace 100 from the discharge port 102, and it includes two first rotating conveying units 401 respectively arranged outside the preheating furnace 100 near the feed port 101 and the discharge port 102, and a second rotating conveying unit 402 arranged between every two adjacent preheating assemblies 200. The sucker rod 300 is rotated and conveyed around its own axis through the first preset distance between the two preheating units 201 arranged above and below, so that the outer peripheral wall of the sucker rod 300 can evenly receive the heat radiated by the two preheating units 201 arranged above and below during the rotating conveying process, so that the sucker rod 300 is evenly preheated.

[0039] The sucker rod preheating device provided by the present application rotates and transports the sucker rod 300 from the feed port 101 to the preheating furnace 100 through the first rotating conveying unit 401. The sucker rod 300 entering the preheating furnace 100 passes between two preheating units 201 spaced apart by a first preheating distance around its own axis under the action of the second rotating conveying unit 402. Since the sucker rod 300 is rotated and transported to the preheating furnace 100 and is rotated and transported in the preheating furnace 100 and is rotated and output from the discharge port 102 under the action of the second rotating conveying unit 402, That is to say, the entire conveying process of the sucker rod 300 in the preheating furnace 100 is a rotating conveying around its own axis, so that the outer peripheral wall of the sucker rod 300 can evenly receive the heat radiated by the preheating unit 201 arranged above and below it in the preheating furnace 100, so that the temperature of the outer peripheral wall of the preheated sucker rod 300 is uniform, thereby improving the uniformity of the preheating of the sucker rod 300, and allowing the plastic powder sprayed on the preheated sucker rod 300 to solidify quickly, thereby improving the efficiency of plastic powder solidification and the spraying quality of the sucker rod 300.

[0040] In some embodiments, reference Figure 1The feed port 101 and the discharge port 102 in the present application are arranged relatively to each other along the length direction of the preheating furnace 100, which increases the rotation and transportation stroke of the sucker rod 300 in the preheating furnace 100, and prolongs the rotation and transportation time of the sucker rod 300 in the preheating furnace 100, thereby increasing the preheating time of the sucker rod 300, so that the preheated sucker rod 300 can reach the required preheating temperature.

[0041] In some embodiments, reference Figure 2 and Figure 3 , each preheating unit 201 in the present application includes a heat conducting plate 2011, a plurality of limiting bars 2012 and a plurality of resistance wires 2013; specifically, a plurality of limiting bars 2012 are arranged at equal intervals on the heat conducting plate 2011, a resistance wire 2013 is arranged between each two adjacent limiting bars 2012, the heat conducting plate 2011 is connected to the inner top or inner bottom of the preheating furnace 100 through a connecting piece 500, and the limiting bars 2012 and the resistance wire 2013 are distributed along the length direction of the preheating furnace 100. Among them, the number of limiting bars 2012 can be set according to actual needs, so the present application does not specifically limit it here. Specifically, the resistance wire 2013 can be limited by the limit bar 2012, so that the resistance wire 2013 has a higher stability on the heat conducting plate 2011. After the resistance wire 2013 is powered on, its own temperature increases, and the heat of the resistance wire 2013 is transferred to the heat conducting plate 2011, so that the temperature of the heat conducting plate 2011 also increases accordingly. The arrangement of multiple preheating components 200 and two preheating units 201 in each preheating component 200 enables the temperature in the preheating furnace 100 to increase rapidly, thereby improving the preheating efficiency of the sucker rod 300.

[0042] In some embodiments, reference Figure 3 and Figure 4 In the present application, a plurality of rows of fixing holes 600 are provided on the heat conducting plate 2011, and the plurality of rows of fixing holes 600 correspond one-to-one to the plurality of limiting strips 2012; specifically, each row of fixing holes 600 includes a plurality of first through holes 601 arranged at equal intervals, and each limiting strip 2012 is provided with a plurality of second through holes 602 which correspond one-to-one to the plurality of first through holes 601 in each row of fixing holes 600 at equal intervals along its length direction; wherein the connecting member 500 penetrates the first through holes 601 and the second through holes 602 to fix the limiting strip 2012 and the heat conducting plate 2011 together.

[0043] In addition, one end of the connecting member 500 passes through the first through hole 601 and the second through hole 602 , and the top end of the connecting member 500 is connected to the inner top surface of the preheating furnace 100 or the bottom end thereof is connected to the inner bottom surface of the preheating furnace 100 . Among them, the top end of the connecting piece 500 corresponding to the preheating unit 201 arranged above the sucker rod 300 passes through the first through hole 601 and the second through hole 602 in sequence and is connected to the inner top surface of the preheating furnace 100, and the bottom end of the connecting piece 500 corresponding to the preheating unit 201 arranged below the sucker rod 300 passes through the second through hole 602 and the first through hole 601 in sequence and is connected to the inner bottom surface of the preheating furnace 100. The top end of the connecting piece 500 and the inner top surface of the preheating furnace 100 and the bottom end of the connecting piece 500 and the inner bottom surface of the preheating furnace 100 can be connected by welding, so that each limiting strip 2012 is stably fixed on the heat conducting plate 2011 through multiple connecting pieces 500, thereby improving the stability of the limiting strip 2012 on the heat conducting plate 2011.

[0044] In some embodiments, reference Figure 3 and Figure 4 There are multiple connectors 500 in the present application, and each connector 500 corresponds to a first through hole 601 and a second through hole 602, so as to fix the limiting strip 2012 and the heat conducting plate 2011 together by the connector 500 penetrating the first through hole 601 and the second through hole 602.

[0045] In addition, the connecting member 500 includes an insert rod 501 and a support plate 502; specifically, the insert rod 501 passes through the first through hole 601 and the second through hole 602, the middle part of the support plate 502 is arranged on the insert rod 501 and is used to support the heat conducting plate 2011, and the top end of the insert rod 501 is fixedly connected to the inner top surface of the preheating furnace 100 or the bottom end thereof is fixedly connected to the inner bottom surface of the preheating furnace 100. The support plate 502 and the insert rod 501 can be connected together by welding, and the arrangement of the support plate 502 improves the stability of the heat conducting plate 2011, the plurality of limit bars 2012 on the heat conducting plate 2011, and the resistance wire 2013 between each two adjacent limit bars 2012.

[0046] In some embodiments, reference Figure 3 Each resistance wire 2013 in the present application is wavy, which increases the surface area of ​​the resistance wire 2013 in the preheating furnace 100, so that the resistance wire 2013 can radiate more heat at the same time, thereby improving the preheating efficiency of the sucker rod 300 entering the preheating furnace 100.

[0047] In some embodiments, each limit bar 2012 in the present application is made of a heat-conducting material. The heat-conducting material is a composite of Al2O3, SiO2, and FeO3. The limit bar 2012 made of the heat-conducting material can receive the heat radiated by the resistance wire 2013, so that the temperature of the limit bar 2012 increases with the temperature of the resistance wire 2013, so that the temperature in the entire preheating furnace 100 increases, thereby improving the preheating efficiency of the sucker rod 300.

[0048] In some embodiments, reference Figure 5 The first preset distance in the present application is greater than the diameter of the rod head of the sucker rod 300, so that the sucker rod 300 can be smoothly rotated and transported within the first preset distance between the two preheating units 201 arranged above and below, ensuring the smooth rotation and transportation of the sucker rod 300 in the preheating furnace 100.

[0049] In some embodiments, reference Figure 1 Each first rotating conveying unit 401 in the present application includes a support frame 4011, a plurality of first rotating shafts 4012, and a plurality of first rollers 4013 sequentially sleeved on each first rotating shaft 4012; wherein, the number of the first rollers 4013 can be set according to actual needs, and therefore, the present application does not specifically limit it here. The opposite sides of the support frame 4011 are horizontally arranged along the conveying direction of the sucker rod 300. Since the sucker rod 300 has a certain length, the plurality of first rotating shafts 4012 and the first rollers 4013 on each first rotating shaft 4012 realize the stability of the rotating conveying process of the sucker rod 300.

[0050] In addition, a plurality of first rotating shafts 4012 are arranged at equal intervals on the support frame 4011, and both ends of each first rotating shaft 4012 are rotatably connected to the support frame 4011, and an angle is set between each first rotating shaft 4012 and two opposite inner side walls of the support frame 4011 (wherein, the setting of the angle enables the sucker rod 300 to rotate around its own axis during transportation, thereby enabling the sucker rod 300 to be rotatably transported into the preheating furnace 100), and a plurality of first rollers 4013 are sequentially sleeved on the first rotating shafts 4012, and a first rolling groove 700 is set in the middle of each first roller 4013 along its circumference, and a sprocket is sleeved on each first rotating shaft 4012, and the plurality of sprockets are connected by a chain 800. Wherein, the first rolling groove 700 on the plurality of first rollers 4013 on each first rotating shaft 4012 corresponds to one sucker rod 300. The first rolling groove 700 is provided for better placement of the sucker rod 300, and its depth can be set according to actual needs, so the present application does not specifically limit it. The multiple first rolling grooves 700 corresponding to the multiple first rollers 4013 on each first rotating shaft 4012 can realize the synchronous rotation and transportation of multiple sucker rods 300, thereby improving the rotation and transportation efficiency of the sucker rods 300.

[0051] In the above embodiment, one of the first rotating shafts 4012 is driven by a driving member (which can be a driving motor), and the first rotating shaft 4012 drives multiple first rollers 4013 and sprockets thereon to rotate during the rotation process. Since the multiple sprockets are connected by the chain 800, during the rotation of the sprocket on the first rotating shaft 4012, the sprockets on the remaining first rotating shafts 4012 also rotate and drive the corresponding first rotating shafts 4012 to rotate, thereby realizing the rotation and transportation of the sucker rod 300 from the feed port 101 to the preheating furnace 100 or the rotation and transportation out of the preheating furnace 100 from the discharge port 102, so that the outer peripheral wall of the sucker rod 300 is heated more evenly.

[0052] In some embodiments, reference Figure 1 Each second rotating conveying unit 402 in the present application includes a second rotating shaft 4021 and a plurality of second rollers 4022; wherein the second rolling groove 900 on the plurality of second rollers 4022 on each second rotating shaft 4021 corresponds to one sucker rod 300. The number of the second rollers 4022 can be set according to actual needs, and therefore, the present application does not specifically limit it.

[0053] In addition, the two ends of the second rotating shaft 4021 are rotatably arranged on the two side walls in the width direction of the preheating furnace 100, and an angle is arranged between the second rotating shaft 4021 and the inner side wall of the preheating furnace 100 (wherein, the angle is arranged so that the sucker rod 300 can rotate around its own axis during the transportation process, thereby making the outer peripheral wall of the sucker rod 300 fully contact with the preheating unit 201 in the preheating furnace 100, thereby improving the preheating efficiency of the sucker rod 300), and a plurality of second rollers 4022 are sequentially sleeved on the second rotating shaft 4021, and a second rolling groove 900 is arranged in the middle of each second roller 4022 along its circumference. Among them, the second rolling groove 900 is arranged to better place the sucker rod 300, and its depth can be set according to actual needs, so this application does not specifically limit it here.

[0054] In the above embodiment, the second rotating shaft 4021 is driven by a driving member (which may be a driving motor), and the second rotating shaft 4021 drives the plurality of second rollers 4022 thereon to rotate during the rotation process, thereby realizing that the sucker rod 300 can be rotated and transported by the current second rotating transport unit 402 when being transported to the current second rotating transport unit 402 in the preheating furnace 100, so that the outer peripheral wall of the sucker rod 300 is heated more evenly and can be stably and continuously transported to the discharge port 102. The plurality of second rolling grooves 900 corresponding to the plurality of second rollers 4022 on the second rotating shaft 4021 can realize the synchronous rotation and transportation of the plurality of sucker rods 300, thereby improving the rotation and transportation efficiency of the sucker rods 300.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded 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 application.

Claims

1. A sucker rod preheating device, characterized in that: include: A preheating furnace (100), wherein the preheating furnace (100) is provided with a feed inlet (101) and a discharge outlet (102) opposite to each other; A plurality of preheating assemblies (200), wherein the plurality of preheating assemblies (200) are arranged at equal intervals in the preheating furnace (100), each of the preheating assemblies (200) comprising two preheating units (201) arranged at a first preset distance in an upper and lower position, and the preheating units (201) are used to preheat a sucker rod (300) entering the preheating furnace (100); A rotating conveying assembly (400) is used to rotate the sucker rod (300) from the feed port (101) into the preheating furnace (100) and rotate it out of the preheating furnace (100) from the discharge port (102), and comprises two first rotating conveying units (401) respectively arranged outside the preheating furnace (100) close to the feed port (101) and the discharge port (102), and a second rotating conveying unit (402) arranged between each two adjacent preheating assemblies (200).

2. The sucker rod preheating device according to claim 1, characterized in that: The feed port (101) and the discharge port (102) are arranged opposite to each other along the length direction of the preheating furnace (100).

3. The sucker rod preheating device according to claim 1, characterized in that: Each of the preheating units (201) comprises a heat conducting plate (2011), a plurality of limiting strips (2012) and a plurality of resistance wires (2013); A plurality of the limit bars (2012) are arranged at equal intervals on the heat conducting plate (2011), a resistance wire (2013) is arranged between every two adjacent limit bars (2012), the heat conducting plate (2011) is connected to the inner top or inner bottom of the preheating furnace (100) via a connecting piece (500), and the limit bars (2012) and the resistance wire (2013) are distributed along the length direction of the preheating furnace (100).

4. The sucker rod preheating device according to claim 3, characterized in that: The heat conducting plate (2011) is provided with a plurality of rows of fixing holes (600), and the plurality of rows of fixing holes (600) correspond one-to-one to the plurality of limiting strips (2012); Each row of the fixing holes (600) comprises a plurality of first through holes (601) arranged at equal intervals, and each of the limiting strips (2012) is provided with a plurality of second through holes (602) which are evenly spaced along its length direction and correspond one to one to the plurality of first through holes (601) in each row of the fixing holes (600); One end of the connecting piece (500) passes through the first through hole (601) and the second through hole (602), and the top end of the connecting piece (500) is connected to the inner top surface of the preheating furnace (100) or the bottom end of the connecting piece (500) is connected to the inner bottom surface of the preheating furnace (100).

5. The sucker rod preheating device according to claim 4, characterized in that: There are a plurality of connecting members, and each connecting member (500) corresponds to one first through hole (601) and one second through hole (602); The connecting member (500) comprises an insert rod (501) and a support plate (502); The insertion rod (501) passes through the first through hole (601) and the second through hole (602); the middle portion of the support plate (502) is arranged on the insertion rod (501) and is used to support the heat conducting plate (2011); the top end of the insertion rod (501) is fixedly connected to the inner top surface of the preheating furnace (100) or the bottom end of the insertion rod is fixedly connected to the inner bottom surface of the preheating furnace (100).

6. The sucker rod preheating device according to claim 3, characterized in that: Each of the resistance wires (2013) is wavy in shape.

7. The sucker rod preheating device according to claim 3, characterized in that: Each of the limiting strips (2012) is made of heat-conducting material.

8. The sucker rod preheating device according to claim 1, characterized in that: The first preset distance is greater than the diameter of the rod head of the sucker rod (300).

9. The sucker rod preheating device according to any one of claims 1 to 8, characterized in that: Each of the first rotating conveying units (401) comprises a support frame (4011), a plurality of first rotating shafts (4012), and a plurality of first rollers (4013) sequentially sleeved on each of the first rotating shafts (4012); A plurality of first rotating shafts (4012) are arranged at equal intervals on the support frame (4011), and both ends of each first rotating shaft (4012) are rotatably connected to the support frame (4011), an angle is set between each first rotating shaft (4012) and two opposite inner side walls of the support frame (4011), a plurality of first rollers (4013) are sequentially sleeved on the first rotating shaft (4012), a first rolling groove (700) is set in the middle part of each first roller (4013) along its circumference, a sprocket is sleeved on each first rotating shaft (4012), and a plurality of the sprockets are connected by a chain (800).

10. The sucker rod preheating device according to claim 9, characterized in that: Each of the second rotating conveying units (402) comprises a second rotating shaft (4021) and a plurality of second rollers (4022); The two ends of the second rotating shaft (4021) are rotatably arranged on the two side walls in the width direction of the preheating furnace (100), and the angle is arranged between the second rotating shaft (4021) and the inner side wall of the preheating furnace (100). A plurality of second rollers (4022) are sequentially sleeved on the second rotating shaft (4021), and a second rolling groove (900) is arranged in the middle part of each second roller (4022) along its circumference.

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