A preheating device for wire and cable production

Abstract

This invention discloses a preheating device for wire and cable production, relating to the field of cable preheating technology. It includes a base, on the upper surface of which a preheating box is mounted. Adaptive speed control mechanisms are mounted on both sides of the upper surface of the preheating box. By incorporating a detection component, when the cable elongates due to heat within the preheating box, the elongated cable pushes upwards against a floating roller. The floating roller drives a receiving plate to compress a connecting spring and pushes a sliding rack upwards. The sliding rack, through a gear, connecting shaft one, pulley one, transmission belt, and pulley two, drives a cam to rotate and pushes an overrunning clutch, causing an instantaneous change in the rotational speed of the pay-off roller. This automatically releases the excess cable length generated by thermal elongation, directly converting the cable preheating elongation force into mechanical driving force. This achieves real-time detection and response to thermal elongation without relying on electronic sensors, offering advantages such as fast response speed, high reliability, high temperature resistance, and anti-interference.

Description

Technical Field

[0001] This invention relates to the field of cable preheating technology, specifically a preheating device for wire and cable production. Background Technology

[0002] Wires and cables are wire products used to transmit electrical (magnetic) energy, transmit information, or realize electromagnetic energy conversion. They are typically composed of a conductive core (such as copper or aluminum), an insulation layer, a sheath, and a shielding layer. Based on their application, they are mainly divided into four categories: bare conductors, power cables, communication cables, and wires and cables for electrical equipment. They are widely used in power, communication, transportation, construction, and industrial manufacturing fields. Wire and cable preheating is a process of preheating the conductor before the insulation or sheath extrusion process. Its main purposes include removing moisture from the conductor surface, eliminating internal stress caused by temperature differences, and enhancing the adhesion between the insulation layer and the conductor, thereby preventing defects such as insulation cracking, bubbling, or delamination.

[0003] In the existing technology of wire and cable preheating, the unwinding end actively releases the coiled conductor core, which continuously passes through the preheating box set in the middle, and is then pulled and wound up by the take-up end. Throughout the process, the conductor core passes through the preheating zone at a uniform speed under the tension control between unwinding and take-up, ensuring that the conductor temperature is uniform and stable when it enters the subsequent extrusion head.

[0004] However, during preheating, the cable lengthens due to heat inside the preheating box, but the wire feeding rollers and take-up rollers on both sides operate at fixed speeds. The thermally elongated cable has nowhere to go, and the elongation cannot be detected, which affects the actual feeding and take-up results.

[0005] Although the preheating elongation of the cable can be detected, the elongated cable will form a wavy bend inside the preheating box, causing surface scratches or uneven heating when it hits the box wall. When the thermal elongation accumulates to a certain extent, the cable will slip and release its length, causing a sudden drop in tension, and then it will accumulate elongation again, forming a periodic whipping effect. This affects the concentricity of the subsequent extrusion, and the arched cable will be biased to one side of the preheating box, resulting in uneven heating and reducing the overall preheating effect. Summary of the Invention

[0006] The purpose of this invention is to provide a preheating device for wire and cable production to solve the problem of cable elongation during preheating, which causes harm.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a preheating device for wire and cable production, comprising a base, a preheating box being installed on the upper surface of the base, and adaptive speed regulation mechanisms being installed on both sides of the upper surface of the preheating box; The power input end of the adaptive speed regulation mechanism is equipped with a detection component that converts the cable preheating elongation force into a floating force, and the power output end of the detection component is equipped with a speed-changing component that converts the rotational force into a speed-changing force. The adaptive speed control mechanism consists of a detection component and a speed change component.

[0008] Preferably, the detection assembly includes a fixed plate, a connecting spring, a telescopic rod, a receiving plate, a floating roller, and a sliding rack. The lower surface of the fixed plate is fixedly installed on the left side of the upper surface of the preheating box. One end of the connecting spring is fixedly installed on the left side of the lower surface of the fixed plate. One end of the telescopic rod is fixedly installed on the left side of the lower surface of the fixed plate. The upper surface of the receiving plate is fixedly installed on the other end of the connecting spring and the telescopic rod. The upper surface of the outer shell of the floating roller is fixedly installed on the lower surface of the receiving plate. The lower surface of the sliding rack is fixedly installed on the upper surface of the receiving plate, and the outer surface of the sliding rack is slidably connected to the inner wall of the fixed plate.

[0009] Preferably, the transmission assembly includes a rectangular block, a second connecting shaft, a cam, an overrunning clutch, and a second pulley. The lower surface of the rectangular block is fixedly installed on the right side of the upper surface of the base. The outer surface of the second connecting shaft is rotatably installed on the inner wall of the rectangular block. The interior of the cam is fixedly installed on the outer surface of the second connecting shaft. The outer surface of the overrunning clutch is in contact with the outer surface of the cam. The interior of the second pulley is fixedly installed on the outer surface of the second connecting shaft.

[0010] Preferably, a rectangular plate is fixedly installed on the upper surface of the fixing plate, and a connecting shaft is rotatably installed on the inner wall of the rectangular plate.

[0011] Preferably, a gear is fixedly mounted on the outer surface of the connecting shaft, and the outer surface of the gear meshes with the right side of the sliding rack.

[0012] Preferably, a pulley is fixedly mounted on one end of the connecting shaft, and a transmission belt is driven onto the outer surface of the pulley.

[0013] Preferably, the outer surface of the second pulley is connected to the inner ring of the transmission belt.

[0014] Preferably, a control panel is installed on the right side of the front of the preheating box, an inlet is opened on the right side of the preheating box, an outlet is opened on the left side of the preheating box, and multiple sets of receiving rods are installed inside the preheating box.

[0015] Preferably, a placement block is fixedly installed on the right side of the upper surface of the base, a wire feeding roller is installed on the upper surface of the placement block, an electric rotating rod is rotatably installed on the inner wall of the placement block, and the outer surface of the electric rotating rod is installed with the inner wall of the wire feeding roller, and the outer surface of the electric rotating rod is installed with the inside of the overrunning clutch.

[0016] Preferably, a second placement block is fixedly installed on the upper left side surface of the base, a take-up roller is installed on the upper surface of the second placement block, and an electric rotating rod is rotatably installed on the inner wall of the second placement block. The outer surface of the electric rotating rod is installed inside the take-up roller.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention, through the setting of a detection component, when the cable elongates due to heat in the preheating box, the elongated cable pushes upwards against a floating roller. The floating roller drives the receiving plate to compress the connecting spring and pushes the sliding rack upwards. The sliding rack, through the transmission of gears, connecting shaft one, pulley one, transmission belt, and pulley two, drives the cam to rotate and pushes the overrunning clutch, causing an instantaneous change in the rotational speed of the pay-off roller. This automatically releases the excess cable length generated by thermal elongation, directly converting the cable preheating elongation force into mechanical driving force. This achieves real-time detection and response to thermal elongation without relying on electronic sensors, and has the advantages of fast response speed, high reliability, high temperature resistance, and anti-interference. It effectively solves the problem of where the cable elongation cannot be released under traditional fixed rotational speed conditions.

[0018] This invention uses an adaptive speed control mechanism to intermittently adjust the speed of the pay-off roller, maintaining a dynamic tension balance between the pay-off and take-up ends. This prevents the cable from forming a wavy bend within the preheating chamber, causing surface scratches or uneven heating due to contact with the chamber walls. Simultaneously, it eliminates the sudden tension drop and periodic whiplash effect caused by rapid slippage after thermal elongation, preventing uneven heating due to the cable biasing to one side of the preheating chamber. This ensures concentricity and insulation layer thickness uniformity in subsequent extrusion processes, improving cable preheating efficiency and finished product yield. The device is compact, purely mechanically linked, and has low maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A top-view structural diagram; Figure 3 For the present invention Figure 1 A schematic diagram of the structure viewed from below; Figure 4 For the present invention Figure 1 Internal structure diagram; Figure 5 For the present invention Figure 4 A schematic diagram of the side view structure; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A; Figure 7 For the present invention Figure 4 A top-view structural diagram; Figure 8 For the present invention Figure 7 A magnified structural diagram at point B.

[0020] In the diagram: 1. Base; 2. Preheating box; 3. Control panel; 4. Inlet; 5. Outlet; 6. Placement block one; 7. Pay-off roller; 8. Electric rotating rod one; 9. Placement block two; 10. Take-up roller; 11. Electric rotating rod two; 12. Receiving rod; 13. Detection assembly; 131. Fixing plate; 132. Connecting spring; 133. Telescopic rod; 134. Receiving plate; 135. Floating roller; 136. Sliding rack; 137. Rectangular plate; 138. Connecting shaft one; 139. Pulley one; 1310. Transmission belt; 1311. Gear; 14. Speed ​​change assembly; 141. Rectangular block; 142. Connecting shaft two; 143. Cam; 144. Overrunning clutch; 145. Pulley two. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 , Figure 5 and Figure 6 As shown, the present invention provides a technical solution: a preheating device for wire and cable production, including a base 1, a preheating box 2 installed on the upper surface of the base 1, and adaptive speed regulation mechanisms installed on both sides of the upper surface of the preheating box 2. The power input end of the adaptive speed regulation mechanism is equipped with a detection component 13 that converts the cable preheating elongation force into a floating force, and the power output end of the detection component 13 is equipped with a speed change component 14 that converts the rotational force into a speed change force. The adaptive speed control mechanism is composed of a detection component 13 and a speed change component 14. The detection component 13 includes a fixed plate 131, a connecting spring 132, a telescopic rod 133, a receiving plate 134, a floating roller 135, and a sliding rack 136. The lower surface of the fixed plate 131 is fixedly installed on the left side of the upper surface of the preheating box 2. One end of the connecting spring 132 is fixedly installed on the left side of the lower surface of the fixed plate 131. One end of the telescopic rod 133 is fixedly installed on the left side of the lower surface of the fixed plate 131. The upper surface of the receiving plate 134 is fixedly installed on the other end of the connecting spring 132 and the telescopic rod 133. The upper surface of the outer shell of the floating roller 135 is fixedly installed on the other end of the connecting spring 132 and the telescopic rod 133. The lower surface of the sliding rack 136 is fixedly installed on the receiving plate 134, and the lower surface of the sliding rack 136 is fixedly installed on the receiving plate 134. The outer surface of the sliding rack 136 is slidably connected to the inner wall of the fixed plate 131. A rectangular plate 137 is fixedly installed on the upper surface of the fixed plate 131. A connecting shaft 138 is rotatably installed on the inner wall of the rectangular plate 137. A gear 1311 is fixedly installed on the outer surface of the connecting shaft 138. The outer surface of the gear 1311 meshes with the right side of the sliding rack 136. A pulley 139 is fixedly installed at one end of the connecting shaft 138. A transmission belt 1310 is drivenly installed on the outer surface of the pulley 139.

[0023] Specifically, the floating roller 135 contacts the cable. When the cable preheats and elongates, it exerts a force on the floating roller 135, which in turn moves the receiving plate 134. The receiving plate 134 drives the sliding rack 136 to slide on the inner wall of the fixed plate 131. Through the meshing of the gear 1311 and the sliding rack 136, linear motion is converted into rotational motion, causing the connecting shaft 138 to rotate. This converts the cable's elongation force into measurable mechanical motion, providing an accurate signal for subsequent speed regulation and ensuring the accuracy of adaptive speed control. The connection spring 132 and the telescopic rod 133 serve two purposes: firstly, the connection spring 132 provides a certain buffering effect when the cable elongation force changes, making the movement of the floating roller 135 more stable and avoiding inaccurate detection due to sudden changes in force; secondly, the telescopic rod 133 acts as a guide, ensuring that the receiving plate 134 can only move in the vertical direction, improving the stability and reliability of the detection component 13, and ensuring that the entire adaptive speed regulation mechanism can operate stably.

[0024] according to Figure 1 , Figure 6 and Figure 8As shown, the transmission assembly 14 includes a rectangular block 141, a connecting shaft 142, a cam 143, an overrunning clutch 144, and a pulley 145. The lower surface of the rectangular block 141 is fixedly installed on the right side of the upper surface of the base 1. The outer surface of the connecting shaft 142 is rotatably installed on the inner wall of the rectangular block 141. The interior of the cam 143 is fixedly installed on the outer surface of the connecting shaft 142. The outer surface of the overrunning clutch 144 is in contact with the outer surface of the cam 143. The interior of the pulley 145 is fixedly installed on the outer surface of the connecting shaft 142. The outer surface of the pulley 145 is driven by the inner ring of the transmission belt 1310.

[0025] Specifically, the speed change assembly 14, through the coordinated operation of its components, can effectively change the transmission speed. After the detection assembly 13 converts and transmits the cable preheating elongation force, the connecting shaft 142 rotates, driving the cam 143 to rotate. Due to the special cooperation between the overrunning clutch 144 and the cam 143, the overrunning clutch 144 will produce different working states at different working stages, thereby changing the efficiency of power transmission and realizing the speed change function. This allows the cable preheating device to adjust its operating speed according to actual conditions, meeting the requirements for cable preheating speed under different working conditions. Furthermore, the overrunning clutch 144 possesses a unique one-way transmission characteristic. During the rotation of the cam 143, when the speed or direction meets certain conditions, the overrunning clutch 144 automatically engages or disengages. This characteristic makes the speed change process smoother, avoiding shocks and vibrations caused by sudden speed changes, and ensuring the stability of the entire preheating device. Simultaneously, its one-way transmission function prevents reverse power transmission, protecting other components of the device and improving its reliability and service life.

[0026] according to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a control panel 3 is installed on the right side of the front of the preheating box 2. A wire inlet 4 is opened on the right side of the preheating box 2, and a wire outlet 5 is opened on the left side of the preheating box 2. Multiple sets of receiving rods 12 are installed inside the preheating box 2. A placement block 6 is fixedly installed on the right side of the upper surface of the base 1. A wire feeding roller 7 is installed on the upper surface of the placement block 6. An electric rotating rod 8 is rotatably installed on the inner wall of the placement block 6, and the outer surface of the electric rotating rod 8 is installed with the inner wall of the wire feeding roller 7. The outer surface of the electric rotating rod 8 is installed with the interior of the overrunning clutch 144. A placement block 9 is fixedly installed on the upper left side of the base 1. A take-up roller 10 is installed on the upper surface of the placement block 9. An electric rotating rod 11 is rotatably installed on the inner wall of the placement block 9, and the outer surface of the electric rotating rod 11 is installed with the interior of the take-up roller 10.

[0027] Specifically, the control panel 3 located on the right side of the preheating chamber 2 provides operators with an intuitive and convenient interface. Operators can easily start and stop the preheating device and adjust parameters such as preheating temperature and speed through the control panel 3, achieving precise control over the entire preheating process and improving operational convenience and production efficiency. The cable inlet 4 on the right side and the cable outlet 5 on the left side of the preheating chamber 2 provide clear channels for cable entry and exit. Cables enter the preheating chamber 2 through the inlet 4 for preheating treatment and exit through the outlet 5 after treatment. This orderly entry and exit design avoids cable tangling and confusion during the preheating process, ensuring its smooth operation. Multiple sets of support rods 12 inside the preheating chamber 2 provide stable support and connection for the cables within the chamber. The rotation of the electric rotary rod 8 drives the pay-off roller 7 to rotate stably, ensuring smooth cable pay-off. Furthermore, the overrunning clutch 144 mounted on the outer surface of the electric rotary rod 8 prevents reverse power transmission in case of malfunctions or when an emergency stop is needed. This prevents the pay-off roller 7 from continuing to rotate due to inertia, which could cause the cable to slack or become tangled, thus ensuring the stability and safety of the pay-off process. The rotation of the electric rotary rod 11 drives the take-up roller 10 to rotate, orderly winding up the preheated cable. This independent take-up structure can work in conjunction with the pay-off process, precisely controlling the take-up speed based on the preheating rate and cable length, ensuring the cable is neatly wound onto the take-up roller 10 for easy subsequent storage and use.

[0028] The overall effect of the mechanism is as follows: the coiled conductor core is installed on the placement block 6 on the right side of the upper surface of the base 1. The wire core is actively released by the wire release roller 7 driven by the electric rotating rod 8. The wire core passes through the inlet 4 on the right side of the preheating box 2, the multiple sets of receiving rods 12 inside, and the outlet 5 on the left side in sequence. Finally, the take-up roller 10 is driven by the electric rotating rod 11 on the upper surface of the left side of the base 1 to pull and rewind. When the wire core is heated and thermally elongated inside the preheating box 2, the elongated cable will push the floating roller 135 in the detection component 13 upward. The outer shell of the floating roller 135 drives the receiving plate 134 to move upward. The receiving plate 134 compresses the connecting spring 132 and moves along the direction of the telescopic rod 133. At the same time, it drives the sliding rack 136 fixedly installed on the upper surface of the receiving plate 134 to slide upward on the inner wall of the fixed plate 131. When the sliding rack 136 moves upward, the gear 1311 meshing with it on its right side rotates. The gear 1311 drives the pulley 139 to rotate synchronously through the connecting shaft 138. The pulley 139 transmits the rotational power to the pulley 145 through the transmission belt 1310. The pulley 145 drives the connecting shaft 142 to rotate on the inner wall of the rectangular block 141. The connecting shaft 142 drives the cam 143, which is fixedly installed on its outer surface, to rotate. When the cam 143 rotates, it periodically pushes the overrunning clutch 144, which is attached to its outer surface. The overrunning clutch 144 is installed inside the electric rotary rod 8. When the cam 143 pushes the overrunning clutch 144, the overrunning clutch 144 enters the overrunning state, temporarily disengaging the transmission between the electric rotary rod 8 and the wire feeding roller 7. The rotational speed of the wire feeding roller 7 changes instantaneously relative to the constant rotational speed of the electric rotary rod 8, thereby releasing the excess cable length caused by thermal expansion. After the thermal elongation is released, the connecting spring 132 pushes the receiving plate 134 and the floating roller 135 to reset, the sliding rack 136 moves downward and drives the gear 1311 to rotate in the opposite direction, the cam 143 disengages from the overrunning clutch 144, the overrunning clutch 144 returns to the engaged state, the wire feeding roller 7 returns to normal speed and continues to feed wire, the adaptive speed regulation mechanism senses the thermal elongation of the cable in real time through the detection component 13 and drives the speed change component 14 to intermittently adjust the speed of the wire feeding roller 7, so that the tension between the wire feeding end and the wire taking end is kept in dynamic balance, effectively eliminating the arching, bending and whipping phenomena of the cable in the preheating box 2, ensuring that the wire core is heated evenly and enters the subsequent extrusion process stably.

[0029] The preheating box 2 can be a high-frequency induction preheating box of model GRQ-220-6kW. The control panel 3 is equipped with a Siemens SIMATIC HMI TP700 touch screen control panel. Both electric rotary rod 8 and electric rotary rod 11 use Delta ECMA-C10604RS servo motor rotary rods. The overrunning clutch 144 is a CSK type PP series roller type one-way overrunning clutch. In use, an external 380V industrial power supply is connected to the control panel 3, which supplies power to the preheating box 2, electric rotary rod 8, and electric rotary rod 11. At the same time, the operator sets the preheating temperature and take-up and unwinding speed parameters through the control panel 3, so that electric rotary rod 8 drives the unwinding roller 7 to actively unwind the wire, and electric rotary rod 11 drives the take-up roller 10 to pull and rewind. The outer shell and receiving plate 134 of the floating roller 135 are made of high-temperature alloy steel with low thermal conductivity to avoid the roller itself overheating and damaging the cable surface. The sliding rack 13 6 and gear 1311 should be made of carburized and quenched alloy steel such as 20CrMnTi, and the tooth surface hardness should reach HRC58-62 to resist wear caused by frequent reciprocating sliding friction; the connecting spring 132 should be made of heat-resistant spring steel to prevent elastic decay at high temperature from causing inaccurate floating detection force; the internal rollers and cage of the overrunning clutch 144 should be made of bearing steel and used with high-temperature grease, and the surface of the cam 143 should be nitrided to enhance fatigue resistance; the transmission belt 1310 should be made of high-temperature resistant polyurethane or aramid reinforced synchronous belt to avoid belt aging and breakage caused by heat radiation from the preheating box 2; the load-bearing structural components such as the base 1, placement block 1 6 and placement block 2 9 should be made of cast iron HT250 or welded steel frame and stress-relief annealed to ensure the rigidity and stability of the whole machine during long-term operation.

[0030] During use, the contact pressure between the floating roller 135 and the cable should be checked regularly to ensure that the preload of the connecting spring 132 is appropriate. Excessive pressure will scratch the cable surface, while insufficient pressure will prevent effective detection of thermal elongation. The engagement gap between the overrunning clutch 144 and the cam 143 should be controlled. Excessive gap will cause response delay, while insufficient gap will easily cause jamming. The speed settings of the electric rotary lever 18 and the electric rotary lever 21 should be matched with the cable material and preheating temperature to avoid excessive speed difference causing frequent opening and closing of the overrunning clutch 144. To prevent mechanical fatigue, before starting the preheating box 2, the pay-off roller 7 and take-up roller 10 should be turned on and run idle for a period of time to confirm that the sliding rack 136 slides smoothly on the inner wall of the fixed plate 131 and that the transmission belt 1310 does not slip or make abnormal noise before formal production. The meshing surfaces of the gear 1311 and the sliding rack 136, and the contact surfaces of the cam 143 and the overrunning clutch 144 should be lubricated and maintained. The connecting spring 132 should be checked for permanent deformation. If any abnormality is found, it should be replaced in time to ensure the long-term reliable operation of the adaptive speed regulation mechanism.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A preheating device for wire and cable production, characterized by: Includes a base (1), on the upper surface of the base (1) a preheating box (2) is installed, and on both sides of the upper surface of the preheating box (2) an adaptive speed regulation mechanism is installed; The power input end of the adaptive speed regulation mechanism is equipped with a detection component (13) that converts the cable preheating elongation force into a floating force, and the power output end of the detection component (13) is equipped with a speed change component (14) that converts the rotational force into a speed change force. The adaptive speed control mechanism is composed of a detection component (13) and a speed change component (14).

2. A preheating device for wire and cable production according to claim 1, characterized in that: The detection component (13) includes a fixed plate (131), a connecting spring (132), a telescopic rod (133), a receiving plate (134), a floating roller (135), and a sliding rack (136). The lower surface of the fixed plate (131) is fixedly installed on the left side of the upper surface of the preheating box (2). One end of the connecting spring (132) is fixedly installed on the left side of the lower surface of the fixed plate (131). One end of the telescopic rod (133) is fixedly installed on the left side of the lower surface of the fixed plate (131). The upper surface of the receiving plate (134) is fixedly installed on the other end of the connecting spring (132) and the telescopic rod (133). The upper surface of the outer shell of the floating roller (135) is fixedly installed on the lower surface of the receiving plate (134). The lower surface of the sliding rack (136) is fixedly installed on the upper surface of the receiving plate (134), and the outer surface of the sliding rack (136) is slidably connected to the inner wall of the fixed plate (131).

3. The preheating device for wire and cable production according to claim 1, characterized in that: The transmission assembly (14) includes a rectangular block (141), a connecting shaft (142), a cam (143), an overrunning clutch (144), and a pulley (145). The lower surface of the rectangular block (141) is fixedly installed on the right side of the upper surface of the base (1). The outer surface of the connecting shaft (142) is rotatably installed on the inner wall of the rectangular block (141). The interior of the cam (143) is fixedly installed on the outer surface of the connecting shaft (142). The outer surface of the overrunning clutch (144) is in contact with the outer surface of the cam (143). The interior of the pulley (145) is fixedly installed on the outer surface of the connecting shaft (142).

4. The preheating device for wire and cable production according to claim 2, characterized in that: A rectangular plate (137) is fixedly installed on the upper surface of the fixed plate (131), and a connecting shaft (138) is rotatably installed on the inner wall of the rectangular plate (137).

5. A preheating device for wire and cable production according to claim 4, characterized in that: A gear (1311) is fixedly mounted on the outer surface of the connecting shaft (138), and the outer surface of the gear (1311) meshes with the right side of the sliding rack (136).

6. A preheating device for wire and cable production according to claim 4, characterized in that: One end of the connecting shaft (138) is fixedly mounted with a pulley (139), and a transmission belt (1310) is driven onto the outer surface of the pulley (139).

7. The preheating device for wire and cable production according to claim 3, characterized in that: The outer surface of the second pulley (145) is connected to the inner ring of the transmission belt (1310) for transmission.

8. The preheating device for wire and cable production according to claim 1, characterized in that: A control panel (3) is installed on the right side of the front of the preheating box (2). An inlet (4) is opened on the right side of the preheating box (2), and an outlet (5) is opened on the left side of the preheating box (2). Multiple sets of receiving rods (12) are installed inside the preheating box (2).

9. The preheating device for wire and cable production according to claim 1, characterized in that: A placement block (6) is fixedly installed on the right side of the upper surface of the base (1). A wire feeding roller (7) is installed on the upper surface of the placement block (6). An electric rotating rod (8) is rotatably installed on the inner wall of the placement block (6). The outer surface of the electric rotating rod (8) is installed with the inner wall of the wire feeding roller (7). The outer surface of the electric rotating rod (8) is installed with the inside of the overrunning clutch (144).

10. The preheating device for wire and cable production according to claim 1, characterized in that: A second placement block (9) is fixedly installed on the upper left side surface of the base (1). A take-up roller (10) is installed on the upper surface of the second placement block (9). An electric rotating rod (11) is rotatably installed on the inner wall of the second placement block (9). The outer surface of the electric rotating rod (11) is installed inside the take-up roller (10).

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