Straight line production device for heat generating tubes

Abstract

The present disclosure provides a heating tube linear production device. The heating tube linear production device comprises a pre-compression tube assembly, a tube length measurement assembly, and a middle extension assembly. The tube length measurement assembly comprises a tube body conveying belt, a first tube length measurement piece, and a second tube length measurement piece. The first tube length measurement piece is used to measure the total length of the pre-compression tube body. The tube body conveying belt is used to linearly convey the pre-compression tube body. The second tube length measurement piece is used to mark the positioning coordinates of the middle end point of the pre-compression tube body. The middle extension assembly is used to extend and extrude the middle part of the pre-compression tube body. The first tube length measurement piece measures the total length of the pre-compression tube body. The second tube length measurement piece marks the position of the middle part of the pre-compression tube body by measurement. When the pre-compression tube body is conveyed to the middle extension assembly, the pre-compression tube body is extended in the middle part according to the positioning coordinates of the middle end point, thereby avoiding secondary production and effectively improving the production efficiency of the heating tube.

Description

Technical Field

[0001] This disclosure relates to the field of heating element manufacturing technology, and in particular to a linear production apparatus for heating elements. Background Technology

[0002] Heating elements are electrical components that convert electrical energy into heat energy. Due to their low cost, ease of use, and lack of pollution, they are widely used in various heating applications, such as household appliances, commercial appliances, industrial appliances, steam boilers in power plants, ultra-high voltage transformers, and ship engines. Taking a heating element with a metal shell, resistance wire, and magnesium oxide powder structure as an example, its core production process is as follows: tube cutting → wire winding → wire threading → powder filling → tube shrinking → heat treatment → sealing. During the tube shrinking process, the outer diameter of the tube is reduced to the standard size and then shaped; subsequent cutting is done according to the required length.

[0003] However, for longer heating elements, traditional heating element production equipment requires extending the production line, leading to additional equipment installation and increased production costs. Furthermore, if production is carried out on existing equipment, insufficient length often occurs during single-cycle production, necessitating the remelting of the heating elements and resulting in low production efficiency. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a linear production device for heating tubes that effectively improves production efficiency.

[0005] The purpose of this disclosure is achieved through the following technical solution: A linear production apparatus for heating tubes includes: a pre-compressed tube assembly, a tube length measuring assembly, and a central extension assembly. The pre-compressed tube assembly has a tube body conveying channel for conveying tube bodies to be compressed. The extrusion end of the pre-compressed tube assembly is used to extrude the tube bodies to be compressed to form a pre-compressed tube body. The tube length measuring assembly is located at the outlet of the tube body conveying channel and includes a tube body conveyor belt, a first tube length measuring element, and a second tube length measuring element. The first tube length measuring element is located near the outlet of the tube body conveying channel and is used to measure the total length of the pre-compressed tube body. The tube body conveyor belt is located between the first tube length measuring element and the second tube length measuring element and is used for linearly conveying the pre-compressed tube body. The second tube length measuring element is used to mark the positioning coordinates of the central endpoint of the pre-compressed tube body. The central extension assembly is located on the side of the second tube length measuring element away from the tube body conveyor belt and is used to extend and extrude the central portion of the pre-compressed tube body.

[0006] In one embodiment, the pre-compression tube assembly includes a pre-compression tube housing and a pre-compression tube device. The pre-compression tube device includes a pre-compression tube motor, a pre-compression tube drive wheel, a pre-compression tube driven wheel, and a pre-compression drive wheel mounting box. The pre-compression tube motor is connected to the pre-compression tube housing, and the rotating shaft of the pre-compression tube motor is fixedly connected to the pre-compression tube drive wheel. The pre-compression tube drive wheel and the pre-compression tube driven wheel are both rotatably mounted on the pre-compression drive wheel mounting box, which is disposed inside the pre-compression tube housing. The pre-compression tube drive wheel and the pre-compression tube driven wheel are arranged opposite to each other, and the tube conveying channel is formed between the pre-compression tube drive wheel and the pre-compression tube driven wheel.

[0007] In one embodiment, the pre-compression drive wheel mounting box includes a first box body, a first drive wheel bearing, a second drive wheel bearing, a first gear, and a second gear. The first box body is disposed inside the pre-compression tube housing. The first box body has a first through hole and a second through hole. The first drive wheel bearing passes through the first through hole. The central shaft of the first drive wheel bearing is fixedly connected to the rotating shaft of the pre-compression tube motor. The first gear and the pre-compression tube drive wheel are respectively sleeved at both ends of the central shaft of the first drive wheel bearing. The second drive wheel bearing passes through the second through hole. The second gear and the pre-compression tube driven wheel are respectively sleeved at both ends of the central shaft of the second drive wheel bearing. The first gear and the second gear are meshed with each other.

[0008] In one embodiment, the pre-compression drive wheel mounting box further includes a pre-compression tube fine adjuster, which is connected to the inner wall of the first box body and is also sleeved on the outer ring of the second drive wheel bearing. The pre-compression tube fine adjuster is used to adjust the distance between the second drive wheel bearing and the first drive wheel bearing, and to adjust the extension contact time between the first gear and the second gear and the tube body to be compressed.

[0009] In one embodiment, the pre-compression moving wheel mounting box further includes a pre-compression fine-tuning spring, which is connected to the telescopic end of the pre-compression tube fine-tuner and the outer ring of the first moving wheel bearing, respectively.

[0010] In one embodiment, the first tube length measuring device includes a first measuring bracket, a first coil counter, a first coil counting wheel, and a first support wheel. The first coil counter is disposed on the first measuring bracket, and the coil counting shaft of the first coil counter is connected to the first coil counting wheel. The first support wheel is rotatably disposed on the first measuring bracket, and the first support wheel and the first coil counting wheel are disposed opposite to each other. The first support wheel and the first coil counting wheel are used to slide against the pre-compressed tube body to measure the total length of the pre-compressed tube body.

[0011] In one embodiment, the first tube length measuring device further includes a first measuring slide plate, a first lifting cylinder, and a first buffer spring. The first measuring slide plate is slidably disposed on the first measuring bracket, and the first lap counter is connected to the first measuring slide plate. The first lifting cylinder is fixed on the first measuring bracket, and the lifting end of the first lifting cylinder is connected to the first measuring slide plate to move the first lap counter wheel away from or closer to the first support wheel. The first buffer spring is connected to both the first measuring slide plate and the first measuring bracket. In one embodiment, the first tube length measuring device further includes at least two first tube-strapping rollers, which are rotatably mounted on the first measuring bracket, and a pre-compressed tube body is transmitted between the at least two first tube-strapping rollers; In one embodiment, the first tube length measuring device further includes a first measuring sensor, which is disposed on the first measuring bracket and is used to sense the pre-compressed tube output from the outlet of the tube conveying channel.

[0012] In one embodiment, the second pipe length measuring device includes a second measuring bracket, a second coil counter, a second coil counting wheel, and a second support wheel. The second coil counter is disposed on the second measuring bracket, and the coil counting shaft of the second coil counter is connected to the second coil counting wheel. The second support wheel is rotatably disposed on the second measuring bracket, and the second support wheel and the second coil counting wheel are disposed opposite to each other. The second support wheel and the second coil counting wheel are used to slide against the pre-compressed pipe body to mark the positioning coordinates of the middle end point of the pre-compressed pipe body.

[0013] In one embodiment, the second tube length measuring component further includes a second measuring slide plate, a second lifting cylinder, and a second buffer spring. The second measuring slide plate is slidably mounted on the second measuring bracket, and the second lap counter is connected to the second measuring slide plate. The second lifting cylinder is fixed on the second measuring bracket, and the lifting end of the second lifting cylinder is connected to the second measuring slide plate to move the second lap counter wheel away from or closer to the second support wheel. The second buffer spring is connected to both the second measuring slide plate and the second measuring bracket. In one embodiment, the second tube length measuring device further includes at least two second tube-strapping rollers, which are rotatably mounted on the second measuring bracket, and a pre-compressed tube body is transmitted between the at least two second tube-strapping rollers; In one embodiment, the second tube length measuring device further includes a second measuring sensor disposed on the second measuring bracket, and the second measuring sensor is used to sense the pre-compressed tube output by the tube conveyor belt.

[0014] In one embodiment, the central extension assembly includes a central extension housing and a central extension device. The central extension device includes a central extension motor, a central extension drive wheel, a central extension driven wheel, and a central drive wheel mounting box. The central extension motor is connected to the central extension housing, and the shaft of the central extension motor is fixedly connected to the central extension drive wheel. The central extension drive wheel and the central extension driven wheel are both rotatably mounted on the central drive wheel mounting box. The central extension drive wheel and the central extension driven wheel are arranged opposite to each other. The central extension drive wheel and the central extension driven wheel are used to compress and extend the central part of the pre-compressed tube.

[0015] In one embodiment, the central drive wheel mounting box includes a second box body, a third drive wheel bearing, a fourth drive wheel bearing, a third gear, and a fourth gear. The second box body is disposed on the central extension chassis and has a third through hole and a fourth through hole. The third drive wheel bearing passes through the third through hole and is fixedly connected to the shaft of the central extension motor. The third drive wheel bearing has the third gear and the central extension drive wheel respectively fitted at both ends. The fourth drive wheel bearing passes through the fourth through hole and has the fourth gear and the central extension driven wheel respectively fitted at both ends. The third gear and the fourth gear are meshed with each other.

[0016] In one embodiment, the central drive wheel mounting box further includes a central extension fine adjuster, which is connected to the inner wall of the second box body. The central extension fine adjuster is also sleeved on the fourth drive wheel bearing. The central extension fine adjuster is used to adjust the distance between the fourth drive wheel bearing and the third drive wheel bearing, and to adjust the contact time between the third gear and the fourth gear and the central extension of the pre-compression tube body.

[0017] In one embodiment, the central drive wheel mounting box further includes a central fine-tuning spring, which is connected to the central extension fine-tuner and the third drive wheel bearing, respectively.

[0018] Compared with the prior art, this disclosure has at least the following advantages: After the pre-compressed tube is shrunk, the first tube length measuring device measures the total length of the pre-compressed tube, and the second tube length measuring device marks the position of the middle area of ​​the pre-compressed tube through measurement. When the pre-compressed tube is transported to the middle extension assembly, the pre-compressed tube is extended in the middle according to the positioning coordinates of the middle endpoint, so that the outer diameter of the middle part of the pre-compressed tube is within the allowable range, and the middle length of the pre-compressed tube is increased, so that the overall length of the pre-compressed tube meets the requirements, avoiding secondary production and effectively improving the production efficiency of the heating tube. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a linear production device for heating elements in one embodiment; Figure 2 This is a schematic diagram of a pre-compression tube assembly in one embodiment; Figure 3 This is a schematic diagram of a pre-compression tube in one embodiment; Figure 4 This is an exploded view of the pre-compression tube in one embodiment; Figure 5 This is a schematic diagram of the first tube length measuring component in one embodiment; Figure 6 This is a schematic diagram of the second tube length measuring device in one embodiment; Figure 7 This is a schematic diagram of the central extension component in one embodiment; Figure 8 This is a schematic diagram of the central extender in one embodiment; Figure 9 This is an exploded view of the central extender in one embodiment; Figure 10 This is a flowchart of a method for manufacturing a heating element with mid-end extension in one embodiment. Detailed Implementation

[0021] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] This disclosure relates to a linear production apparatus for heating tubes. In one embodiment, the linear production apparatus for heating tubes includes a pre-compressed tube assembly, a tube length measuring assembly, and a central extension assembly. The pre-compressed tube assembly has a tube body conveying channel for conveying tube bodies to be compressed. The extrusion end of the pre-compressed tube assembly is used to extrude the tube bodies to be compressed to form a pre-compressed tube body. The tube length measuring assembly is located at the outlet of the tube body conveying channel and includes a tube body conveyor belt, a first tube length measuring element, and a second tube length measuring element. The first tube length measuring element is disposed near the outlet of the tube body conveying channel and is used to measure the total length of the pre-compressed tube body. The tube body conveyor belt is located between the first tube length measuring element and the second tube length measuring element and is used for linearly conveying the pre-compressed tube body. The second tube length measuring element is used to mark the positioning coordinates of the central endpoint of the pre-compressed tube body. The central extension assembly is located on the side of the second tube length measuring element away from the tube body conveyor belt and is used to extend and extrude the central portion of the pre-compressed tube body. After the pre-compressed tube is shrunk, the first tube length measuring device measures the total length of the pre-compressed tube, and the second tube length measuring device marks the position of the middle area of ​​the pre-compressed tube through measurement. When the pre-compressed tube is transported to the middle extension assembly, the pre-compressed tube is extended in the middle according to the positioning coordinates of the middle endpoint, so that the outer diameter of the middle part of the pre-compressed tube is within the allowable range, and the middle length of the pre-compressed tube is increased, so that the overall length of the pre-compressed tube meets the requirements, avoiding secondary production and effectively improving the production efficiency of the heating tube.

[0025] Please see Figure 1 This is a schematic diagram of the structure of a linear heating tube production device according to an embodiment of the present disclosure.

[0026] An embodiment of a linear heating element production apparatus 10 includes a pre-compressed tube assembly 100, a tube length measuring assembly 200, and a central extension assembly 300. The pre-compressed tube assembly 100 has a tube conveying channel for transporting tubes to be compressed. The extrusion end of the pre-compressed tube assembly 100 is used to compress the tubes to be compressed, forming a pre-compressed tube. The tube length measuring assembly 200 is located at the outlet of the tube conveying channel. The tube length measuring assembly 200 includes a tube conveyor belt 210, a first tube length measuring element 220, and a second tube length measuring element 230. The first tube length measuring element 220 is disposed near the outlet of the tube conveying channel and is used to measure the total length of the pre-compressed tube. The tube conveyor belt 210 is located between the first tube length measuring element 220 and the second tube length measuring element 230, and is used for linearly transporting the pre-compressed tube. The second tube length measuring element 230 is used to mark the positioning coordinates of the central endpoint of the pre-compressed tube. The central extension component 300 is located on the side of the second tube length measuring component 230 away from the tube body conveyor belt 210, and the central extension component 300 is used to extend and compress the central part of the pre-compressed tube body.

[0027] In this embodiment, after the pre-compressed tube is shrunk, the first tube length measuring device 220 measures the total length of the pre-compressed tube, and the second tube length measuring device 230 marks the position of the middle region of the pre-compressed tube by measurement. When the pre-compressed tube is transported to the middle extension component 300, the pre-compressed tube is extended in the middle according to the positioning coordinates of the middle endpoint, so that the outer diameter of the middle part of the pre-compressed tube is within the allowable range, the middle length of the pre-compressed tube is increased, and the overall length of the pre-compressed tube meets the requirements, avoiding secondary production and effectively improving the production efficiency of the heating tube.

[0028] In one embodiment, please refer to Figure 2 The pre-compression tube assembly 100 includes a pre-compression tube housing 110 and a pre-compression tube device 120. Please refer to both. Figure 3The pre-compressor tube 120 includes a pre-compressor tube motor 122, a pre-compressor tube drive wheel 124, a pre-compressor tube driven wheel 126, and a pre-compressor drive wheel mounting box 128. The pre-compressor tube motor 122 is connected to the pre-compressor tube housing 110. The rotating shaft of the pre-compressor tube motor 122 is fixedly connected to the pre-compressor tube drive wheel 124. The pre-compressor tube drive wheel 124 and the pre-compressor tube driven wheel 126 are both rotatably mounted on the pre-compressor drive wheel mounting box 128. The pre-compressor drive wheel mounting box 128 is disposed inside the pre-compressor tube housing 110. The pre-compressor tube drive wheel 124 and the pre-compressor tube driven wheel 126 are arranged opposite to each other, and the pre-compressor tube drive wheel 124 and the pre-compressor tube driven wheel 126 form the tube conveying channel. In this embodiment, the pre-compression tube housing 110 serves as the carrier for the pre-compression tube device 120 and the tube body to be compressed. The pre-compression tube motor 122 is fixed on the pre-compression tube housing 110 and provides power to the pre-compression tube drive wheel 124, facilitating the transmission of the tube body to be compressed by the pre-compression tube drive wheel 124. The pre-compression tube driven wheel 126 is correspondingly arranged to the pre-compression tube drive wheel 124, and the pre-compression tube driven wheel 126 and the pre-compression tube drive wheel 124 work together to compress the tube body to be compressed. The pre-compression drive wheel mounting box 128 is located inside the pre-compression tube housing 110. The pre-compression drive wheel mounting box 128 provides an installation platform for the pre-compression tube drive wheel 124 and the pre-compression tube driven wheel 126, facilitating the alignment of the pre-compression tube drive wheel 124 and the pre-compression tube driven wheel 126 with the tube body to be compressed, thereby achieving tube compression.

[0029] Further, please refer to Figure 4The pre-compression drive wheel mounting box 128 includes a first box body 1282, a first drive wheel bearing 1284, a second drive wheel bearing 1286, a first gear 1288, and a second gear 1281. The first box body 1282 is disposed inside the pre-compression tube housing 110. The first box body 1282 has a first through hole 102 and a second through hole 104. The first drive wheel bearing 1284 passes through the first through hole 102. The central axis of the first drive wheel bearing 1284 is fixedly connected to the rotating shaft of the pre-compression tube motor 122. The first gear 1288 and the pre-compression tube drive wheel 124 are respectively sleeved at both ends of the central axis of the first drive wheel bearing 1284. The second drive wheel bearing 1286 passes through the second through hole 104. The second gear 1281 and the pre-compression tube driven wheel 126 are respectively sleeved at both ends of the central axis of the second drive wheel bearing 1286. The first gear 1288 and the second gear 1281 are meshed with each other. In this embodiment, the first housing 1282 serves as a fixed platform for the first rotating wheel bearing 1284, the second rotating wheel bearing 1286, the first gear 1288, and the second gear 1281. The first rotating wheel bearing 1284 and the second rotating wheel bearing 1286 are mounted on the first housing 1282 as rotating bearings. Specifically, the first rotating wheel bearing 1284 passes through the first through hole 102, and the second rotating wheel bearing 1286 passes through the second through hole 104. The first rotating wheel bearing 1284 and the second rotating wheel bearing 1286 are arranged parallel to each other. One end of the central shaft of the first moving wheel bearing 1284 is fixedly connected to the rotating shaft of the pre-compression tube motor 122. The first moving wheel bearing 1284 serves as a power bearing. The first gear 1288 is also sleeved on one end of the central shaft of the first moving wheel bearing 1284 near the pre-compression tube motor 122. The pre-compression tube drive wheel 124 is sleeved on the other end of the central shaft of the first moving wheel bearing 1284. Under the rotation of the pre-compression tube motor 122, the first moving wheel bearing 1284 drives the first gear 1288 and the pre-compression tube drive wheel 124 to rotate. The second gear 1281 is fitted onto one end of the central shaft of the second driving wheel bearing 1286 near the pre-compression tube motor 122, and the pre-compression tube driven wheel 126 is fitted onto the other end of the central shaft of the second driving wheel bearing 1286. The second gear 1281 rotates synchronously under the drive of the first gear 1288, so that the second driving wheel bearing 1286 drives the pre-compression tube driven wheel 126, realizing the rotation of the pre-compression tube driven wheel 126. In this way, when the pre-compression tube motor 122 rotates, the pre-compression tube driving wheel 124 and the pre-compression tube driven wheel 126 rotate in opposite directions, which facilitates the transmission of the tube body to be shrunk, and at the same time enables the tube body to be shrunk to be shrunk.

[0030] Furthermore, please refer to Figure 4 The pre-compression drive wheel mounting box 128 further includes a pre-compression tube fine adjuster 1283. The pre-compression tube fine adjuster 1283 is connected to the inner wall of the first box body 1282. The pre-compression tube fine adjuster 1283 is also sleeved on the outer ring of the second drive wheel bearing 1286. The pre-compression tube fine adjuster 1283 is used to adjust the distance between the second drive wheel bearing 1286 and the first drive wheel bearing 1284, and to adjust the extension contact time between the first gear 1288 and the second gear 1281 and the tube to be compressed. In this embodiment, the pre-compression tube fine adjuster 1283 is disposed inside the first box body 1282. The pre-compression tube fine adjuster 1283 is sleeved on the second drive wheel bearing 1286. Specifically, the pre-compression tube fine adjuster 1283 is sleeved on the outside of the outer ring of the second drive wheel bearing 1286, and there is a gap between the pre-compression tube fine adjuster 1283 and the outer ring of the second drive wheel bearing 1286. The telescopic end of the pre-compression tube fine-tuner 1283 is connected to the outer ring of the second moving wheel bearing 1286, and is used to adjust the position of the second moving wheel bearing 1286. This facilitates changing the distance between the second moving wheel bearing 1286 and the first moving wheel bearing 1284, thereby facilitating the adjustment of the distance between the pre-compression tube driving wheel 124 and the pre-compression tube driven wheel 126, and further facilitating the adjustment of the outer diameter of the tube body after compression. The distance adjustment accuracy of the pre-compression tube fine-tuner 1283 is at the 0.1mm level, and a certain amount of play is reserved between the first gear 1288 and the second gear 1281 to ensure that they can still mesh after adjustment.

[0031] Furthermore, please refer to Figure 4 The pre-compression moving wheel mounting box 128 further includes a pre-compression fine-tuning spring 1285, which is connected to the telescopic end of the pre-compression tube fine-tuner 1283 and the outer ring of the first moving wheel bearing 1284. In this embodiment, the pre-compression fine-tuning spring 1285 is located between the pre-compression tube fine-tuner 1283 and the first moving wheel bearing 1284. One end of the pre-compression fine-tuning spring 1285 is connected to the telescopic end of the pre-compression tube fine-tuner 1283, and the other end is connected to the outer ring of the first moving wheel bearing 1284. When the pre-compression tube fine-tuner 1283 adjusts the distance between the second moving wheel bearing 1286 and the first moving wheel bearing 1284, the elastic force provided by the pre-compression fine-tuning spring 1285 provides a buffer against the compression of the tube body to be compressed, preventing the tube body to be compressed from being directly deformed and reducing the defect rate of the heating tube.

[0032] In another embodiment, both the first moving wheel bearing 1284 and the first moving wheel bearing 1284 are rolling bearings, that is, from the inside to the outside, they are an inner ring, balls and an outer ring, wherein the inner ring is the central shaft.

[0033] In another embodiment, there are multiple pre-compressor tubes 120, which are arranged in sequence. The shafts of the pre-compressor tube motors 122 of two adjacent pre-compressor tubes 120 are perpendicular to each other, which facilitates the pre-compressor tube drive wheel 124 and the pre-compressor tube driven wheel 126 to compress the tube body to be compressed at an angle, so that the outer diameter of the tube body to be compressed is more uniform after compression.

[0034] In one embodiment, please refer to Figure 5 The first pipe length measuring device 220 includes a first measuring bracket 222, a first coil counter 224, a first coil counting wheel 226, and a first support wheel 228. The first coil counter 224 is mounted on the first measuring bracket 222, and its counting shaft is connected to the first coil counting wheel 226. The first support wheel 228 is rotatably mounted on the first measuring bracket 222, and is positioned opposite to the first coil counting wheel 226. The first support wheel 228 and the first coil counting wheel 226 are used to slide against the pre-compressed pipe body to measure the total length of the pre-compressed pipe body. In this embodiment, the first measuring bracket 222 is located at the outlet of the pipe body conveying channel, and the first support wheel 228 on the first measuring bracket 222 serves as a transmission roller for the pre-compressed pipe body, providing rotational support for the transmission of the pre-compressed pipe body. The first counting wheel 226 is disposed opposite to the first support wheel 228. The first counting wheel 226 slides against the pre-compressed tube body and rotates under the drive of the pre-compressed tube body. The first counting device 224 acts as a counter for the number of rotations of the first counting wheel 226, and determines the total length of the pre-compressed tube body by counting the number of rotations of the first counting wheel 226.

[0035] Further, please refer to Figure 5The first tube length measuring component 220 further includes a first measuring slide plate 221, a first lifting cylinder 223, and a first buffer spring 225. The first measuring slide plate 221 is slidably disposed on the first measuring bracket 222, and the first lap counter 224 is connected to the first measuring slide plate 221. The first lifting cylinder 223 is fixed on the first measuring bracket 222, and the lifting end of the first lifting cylinder 223 is connected to the first measuring slide plate 221 to move the first lap counter wheel 226 away from or closer to the first support wheel 228. The first buffer spring 225 is connected to both the first measuring slide plate 221 and the first measuring bracket 222. In this embodiment, the first measuring slide plate 221 is slidably connected to the first measuring bracket 222. Specifically, the first measuring slide plate 221 moves up and down along the surface of the first measuring bracket 222. The first measuring slide plate 221 is equipped with the first lap counter 224. The lap counter shaft of the first lap counter 224 is connected to the first lap counter wheel 226. When the first lifting cylinder 223 pushes the first measuring slide plate 221, the first lap counter 224 drives the first lap counter wheel 226 to move up and down, which facilitates the adjustment of the distance between the first lap counter wheel 226 and the first support wheel 228, thereby facilitating the maintenance of the compression between the first lap counter wheel 226 and the pre-compressed tube body and improving the measurement accuracy of the total length of the pre-compressed tube body.

[0036] Furthermore, please refer to Figure 5 The first tube length measuring component 220 further includes at least two first tube-strapping rollers 227, which are rotatably mounted on the first measuring bracket 222. A pre-compressed tube body is transmitted between the at least two first tube-strapping rollers 227. In this embodiment, the first tube-strapping rollers 227 are located on the first measuring bracket 222, and the first tube-strapping rollers 227 slide against the pre-compressed tube body, facilitating the smoothing of the surface of the pre-compressed tube body by the first tube-strapping rollers 227, ensuring a consistent outer diameter of the pre-compressed tube body. The at least two first tube-strapping rollers 227 are arranged opposite each other, with an included angle of 75° to 135°. Specifically, the two oppositely arranged first tube-strapping rollers 227 are inclined at 120°.

[0037] Furthermore, please refer to Figure 5The first tube length measuring device 220 further includes a first measuring sensor 229, which is mounted on the first measuring bracket 222. The first measuring sensor 229 is used to sense the pre-compressed tube output from the tube conveying channel. In this embodiment, the first measuring sensor 229 is mounted on the first measuring bracket 222, specifically between the pre-compressed tube housing 110 and the first counting wheel 226. The first measuring sensor 229 senses the pre-compressed tube to detect it before measuring the total tube length, facilitating the counting of the first counting wheel 224 and further improving the accuracy of measuring the total tube length of the pre-compressed tube.

[0038] In one embodiment, please refer to Figure 6 The second pipe length measuring component 230 includes a second measuring bracket 232, a second turn counter 234, a second turn counter wheel 236, and a second support wheel 238. The second turn counter 234 is mounted on the second measuring bracket 232, and its turn counter shaft is connected to the second turn counter wheel 236. The second support wheel 238 is rotatably mounted on the second measuring bracket 232, and is positioned opposite to the second turn counter wheel 236. The second support wheel 238 and the second turn counter wheel 236 are used to slide against the pre-compressed pipe body to mark the positioning coordinates of the middle endpoint of the pre-compressed pipe body. In this embodiment, the second measuring bracket 232 is located at the outlet of the pipe body conveyor belt 210, and the second support wheel 238 on the second measuring bracket 232 serves as a conveyor roller for the pre-compressed pipe body, providing rotational support for the conveying of the pre-compressed pipe body. The second counting wheel 236 is disposed opposite to the second support wheel 238. The second counting wheel 236 slides against the pre-compressed tube body and rotates under the drive of the pre-compressed tube body. The second counting device 234 serves as a counter for the number of rotations of the second counting wheel 236, and marks the positioning coordinates of the middle end point of the pre-compressed tube body by counting the number of rotations of the second counting wheel 236.

[0039] Further, please refer to Figure 6The second tube length measuring component 230 further includes a second measuring slide plate 231, a second lifting cylinder 233, and a second buffer spring 235. The second measuring slide plate 231 is slidably mounted on the second measuring bracket 232, and the second lap counter 234 is connected to the second measuring slide plate 231. The second lifting cylinder 233 is fixed to the second measuring bracket 232, and the lifting end of the second lifting cylinder 233 is connected to the second measuring slide plate 231 to move the second lap counter wheel 236 away from or closer to the second support wheel 238. The second buffer spring 235 is connected to both the second measuring slide plate 231 and the second measuring bracket 232. In this embodiment, the second measuring slide plate 231 is slidably connected to the second measuring bracket 232. Specifically, the second measuring slide plate 231 moves up and down along the surface of the second measuring bracket 232. The second measuring slide plate 231 is equipped with the second lap counter 234. The lap counter shaft of the second lap counter 234 is connected to the second lap counter wheel 236. When the second lifting cylinder 233 pushes the second measuring slide plate 231, the second lap counter 234 drives the second lap counter wheel 236 to move up and down, which facilitates the adjustment of the distance between the second lap counter wheel 236 and the second support wheel 238, thereby facilitating the maintenance of the compression between the second lap counter wheel 236 and the pre-compressed tube body and improving the positioning accuracy of the midpoint coordinate of the pre-compressed tube body.

[0040] Furthermore, please refer to Figure 6 The second tube length measuring component 230 further includes at least two second tube-strapping rollers 237, which are rotatably mounted on the second measuring bracket 232. A pre-compressed tube body is transmitted between the at least two second tube-strapping rollers 237. In this embodiment, the second tube-strapping rollers 237 are located on the second measuring bracket 232, and the second tube-strapping rollers 237 slide against the pre-compressed tube body, facilitating the surface smoothing of the pre-compressed tube body by the second tube-strapping rollers 237, ensuring a consistent outer diameter of the pre-compressed tube body. The at least two second tube-strapping rollers 237 are arranged opposite each other, with an included angle of 75° to 135° between them. Specifically, the two oppositely arranged second tube-strapping rollers 237 are inclined at 120°.

[0041] Furthermore, please refer to Figure 6The second tube length measuring device 230 further includes a second measuring sensor 239, which is disposed on the second measuring bracket 232. The second measuring sensor 239 is used to sense the pre-compressed tube output from the tube conveyor belt 210. In this embodiment, the second measuring sensor 239 is mounted on the second measuring bracket 232, specifically, the second measuring sensor 239 is located between the pre-compressed tube housing 110 and the second counting wheel 236. The second measuring sensor 239 senses the pre-compressed tube to detect it before measuring the total tube length, facilitating the counting of the second counting wheel 234 and further improving the positioning accuracy of the midpoint coordinates of the pre-compressed tube.

[0042] In one embodiment, please refer to Figure 7 The central extension assembly 300 includes a central extension housing 310 and a central extender 320. Please refer to the following documents together. Figure 8 The central extender 320 includes a central extender motor 322, a central extender drive wheel 324, a central extender driven wheel 326, and a central drive wheel mounting box 328. The central extender motor 322 is connected to the central extender housing 310. The rotating shaft of the central extender motor 322 is fixedly connected to the central extender drive wheel 324. The central extender drive wheel 324 and the central extender driven wheel 326 are both rotatably mounted on the central drive wheel mounting box 328. The central extender drive wheel 324 and the central extender driven wheel 326 are arranged opposite to each other. The central extender drive wheel 324 and the central extender driven wheel 326 are used to compress and extend the central part of the pre-compressed tube.

[0043] In this embodiment, the central extension housing 310 serves as the supporting body for the central extender 320 and the pre-compressed tube. The central extension motor 322 is fixed to the central extension housing 310 and provides power to the central extension drive wheel 324, facilitating the transmission of the pre-compressed tube by the central extension drive wheel 324. The central extension driven wheel 326 is correspondingly arranged with the central extension drive wheel 324, and the central extension driven wheel 326 and the central extension drive wheel 324 work together to compress the pre-compressed tube. The pre-compression drive wheel mounting box 128 is located inside the central extension housing 310. The pre-compression drive wheel mounting box 128 provides an installation platform for the central extension drive wheel 324 and the central extension driven wheel 326, which facilitates aligning the central extension drive wheel 324 and the central extension driven wheel 326 with the pre-compression tube body to achieve tube shrinkage of the pre-compression tube body.

[0044] Further, please refer to Figure 9The central drive wheel mounting box 328 includes a second box body 3282, a third drive wheel bearing 3284, a fourth drive wheel bearing 3286, a third gear 3288, and a fourth gear 3281. The second box body 3282 is disposed on the central extension housing 310. The second box body 3282 has a third through hole 302 and a fourth through hole 304. The third drive wheel bearing 3284 passes through the third through hole 302. The third drive wheel bearing 3284 and the... The shaft of the central extension motor 322 is fixedly connected. The third gear 3288 and the central extension drive wheel 324 are respectively sleeved at both ends of the third drive wheel bearing 3284. The fourth drive wheel bearing 3286 passes through the fourth through hole 304. The fourth gear 3281 and the central extension driven wheel 326 are respectively sleeved at both ends of the fourth drive wheel bearing 3286. The third gear 3288 and the fourth gear 3281 are meshed with each other.

[0045] In this embodiment, the second housing 3282 serves as a fixed platform for the third rotating wheel bearing 3284, the fourth rotating wheel bearing 3286, the third gear 3288, and the fourth gear 3281. The third rotating wheel bearing 3284 and the fourth rotating wheel bearing 3286 are mounted on the second housing 3282 as rotating bearings. Specifically, the third rotating wheel bearing 3284 passes through the third through hole 302, and the fourth rotating wheel bearing 3286 passes through the fourth through hole 304. The third rotating wheel bearing 3284 and the fourth rotating wheel bearing 3286 are arranged parallel to each other. One end of the central shaft of the third moving wheel bearing 3284 is fixedly connected to the rotating shaft of the central extension motor 322. The third moving wheel bearing 3284 serves as a power bearing. The third gear 3288 is also sleeved on the end of the central shaft of the third moving wheel bearing 3284 near the central extension motor 322. The central extension drive wheel 324 is sleeved on the other end of the central shaft of the third moving wheel bearing 3284. Under the rotation of the central extension motor 322, the third moving wheel bearing 3284 drives the third gear 3288 and the central extension drive wheel 324 to rotate. The fourth gear 3281 is fitted onto one end of the central shaft of the fourth driving wheel bearing 3286 near the central extension motor 322, and the central extension driven wheel 326 is fitted onto the other end of the central shaft of the fourth driving wheel bearing 3286. The fourth gear 3281 rotates synchronously under the drive of the third gear 3288, so that the fourth driving wheel bearing 3286 transmits power to the central extension driven wheel 326, realizing the rotation of the central extension driven wheel 326. In this way, when the central extension motor 322 rotates, the central extension driving wheel 324 and the central extension driven wheel 326 rotate in opposite directions, which facilitates the transmission of the pre-compressed tube and also enables the central extension operation of the pre-compressed tube.

[0046] Furthermore, please refer to Figure 9 The central drive wheel mounting box 328 further includes a central extension fine adjuster 3283, which is connected to the inner wall of the second box body 3282. The central extension fine adjuster 3283 is also sleeved on the fourth drive wheel bearing 3286. The central extension fine adjuster 3283 is used to adjust the distance between the fourth drive wheel bearing 3286 and the third drive wheel bearing 3284, and to adjust the contact time between the third gear 3288 and the fourth gear 3281 and the central extension of the central extension body.

[0047] In this embodiment, the central extension fine-tuning device 3283 is disposed within the second housing 3282. The central extension fine-tuning device 3283 is sleeved with the fourth moving wheel bearing 3286. Specifically, the central extension fine-tuning device 3283 is sleeved on the outer side of the outer ring of the fourth moving wheel bearing 3286, and there is a gap between the central extension fine-tuning device 3283 and the outer ring of the fourth moving wheel bearing 3286. The telescopic end of the central extension fine-tuning device 3283 is connected to the outer ring of the fourth moving wheel bearing 3286 for adjusting the position of the fourth moving wheel bearing 3286, facilitating the change of the distance between the fourth moving wheel bearing 3286 and the third moving wheel bearing 3284, thereby facilitating the adjustment of the distance between the central extension driving wheel 324 and the central extension driven wheel 326, and further facilitating the adjustment of the outer diameter of the pre-compressed tube after tube shrinkage. The distance adjustment accuracy of the central extension fine adjuster 3283 is at the 0.1mm level, and a certain amount of play is reserved between the third gear 3288 and the fourth gear 3281 to ensure that they can still mesh with each other after adjustment.

[0048] Furthermore, please refer to Figure 9 The central moving wheel mounting box 328 also includes a central fine-tuning spring 3285, which is connected to the central extension fine-tuner 3283 and the third moving wheel bearing 3284 respectively.

[0049] In this embodiment, the central fine-tuning spring 3285 is located between the central extension fine-tuning device 3283 and the third moving wheel bearing 3284. One end of the central fine-tuning spring 3285 is connected to the telescopic end of the central extension fine-tuning device 3283, and the other end of the central fine-tuning spring 3285 is connected to the outer ring of the third moving wheel bearing 3284. When the central extension fine-tuning device 3283 adjusts the distance between the fourth moving wheel bearing 3286 and the third moving wheel bearing 3284, the elastic force provided by the central fine-tuning spring 3285 plays a buffering role against the compression of the pre-compressed tube, avoiding direct compression deformation of the pre-compressed tube and reducing the defect rate of the heating tube.

[0050] In another embodiment, both the third moving wheel bearing 3284 and the third moving wheel bearing 3284 are rolling bearings, that is, from the inside to the outside, they are an inner ring, balls and an outer ring, wherein the inner ring is the central shaft.

[0051] In another embodiment, there are multiple central extenders 320, which are arranged sequentially. The shafts of the central extenders 322 of two adjacent central extenders 320 are perpendicular to each other, which facilitates the central extender drive wheel 324 and the central extender driven wheel 326 to perform angular compression of the pre-compressed tube, making the outer diameter of the pre-compressed tube more uniform after compression.

[0052] In another embodiment, both the central extension fine-tuning device 3283 and the pre-compression tube fine-tuning device 1283 are used to adjust the outer diameter of the heating tube. The pre-compression tube fine-tuning device 1283 is used to adjust the outer diameter of the entire tube body to initially achieve the selected outer diameter. The central extension fine-tuning device 3283 is used to fine-tune the outer diameter of the middle section of the tube body after the adjustment by the pre-compression tube fine-tuning device 1283, so that the outer diameter of the middle section of the tube body is smaller than the outer diameters of the two ends of the tube body, but the difference between the two is small, and the outer diameter of the middle section of the tube body is within the required range of the outer diameter of the heating tube. In this way, the total length of the heating tube body can be increased, while meeting both length and outer diameter requirements. In addition, since the two ends of the heating tube body are used for assembly with other equipment, by extending the middle section of the tube body, it can also be ensured that the outer diameter of the ends can be shaped after tube shrinking, without affecting assembly, thus meeting the actual needs of the heating tube.

[0053] In another embodiment, prior to the middle extension process, the outer diameter of the tube to be compressed is larger than the outer diameters at both ends of the pre-compressed tube. After the middle extension process is completed, the outer diameters at both ends of the pre-compressed tube are larger than the outer diameter at the middle of the pre-compressed tube.

[0054] In another embodiment, the linear production apparatus for the heating tube further includes a tube length verification component located on the side of the middle extension component away from the tube length measuring component. This tube length verification component is used for length re-inspection of the pre-compressed tube body. Thus, after the pre-compressed tube body is extended in the middle, the resulting heating tube needs to undergo length re-inspection to verify whether the final length of the pre-compressed tube body meets the set length requirements.

[0055] In another embodiment, the control end of the pre-compression tube fine-tuner is connected to the full-section extrusion tube end of the tube shrinking controller to facilitate the shrinking of the entire tube body. The control end of the middle extension fine-tuner is connected to the middle-section extrusion tube end of the tube shrinking controller to facilitate the shrinking of the middle section of the pre-compression tube body. The output ends of the first and second coil counters are respectively connected to the input end of the tube shrinking controller via encoders, facilitating the conversion of the coil counts of the first and second coil counters into lengths, thereby facilitating the determination of the total length of the pre-compression tube body and the marking of the positioning coordinates of the middle endpoint of the pre-compression tube body.

[0056] In one embodiment, please refer to Figure 10 This disclosure also provides a method for manufacturing a heating element with a middle section extended, the method comprising the following steps: S100: Obtain the pre-compressed tube body.

[0057] In this embodiment, the pre-compressed tube is the tube to be shrunk after being conveyed from the feeder to the tube conveying channel. The tube to be shrunk is pre-compressed within the pre-compressed tube assembly by the pre-compressed tube drive wheel and the pre-compressed tube driven wheel, achieving the tube shrinking operation and reducing the outer diameter of the tube to meet the standard outer diameter requirement. At this time, the pre-compressed tubes output from the tube conveying channel maintain a consistent outer diameter; that is, the outer diameter of the end of the pre-compressed tube is equal to the outer diameter of the middle portion, and both are smaller than the outer diameter of the tube to be shrunk, thus completing the tube shrinking process.

[0058] S200: Perform a pipe length measurement on the pre-compressed pipe body to obtain the total length of the pre-compressed pipe body.

[0059] In this embodiment, the pre-compressed tube is transported to the first tube length measuring device. The pre-compressed tube is clamped by the first counting wheel and the first support wheel. That is, the first support wheel provides transmission support for the pre-compressed tube. The first counting wheel makes sliding contact with the pre-compressed tube, and the first counting device counts the number of rotations of the first counting wheel. This allows for the calculation of the total length of the pre-compressed tube based on the number of rotations, thereby determining whether the length of the pre-compressed tube is too short.

[0060] S300: Perform a secondary pipe length measurement on the pre-compressed pipe body to obtain the positioning coordinates of the middle end point of the pre-compressed pipe body.

[0061] In this embodiment, the pre-compressed tube is conveyed to the second tube length measuring device. The pre-compressed tube is clamped by the second counting wheel and the second support wheel. The second support wheel provides transmission support for the pre-compressed tube. The second counting wheel slides against the pre-compressed tube, and the second counting device counts the number of rotations of the second counting wheel. This facilitates marking the positioning coordinates of the middle endpoint of the pre-compressed tube. Specifically, based on the number of rotations of the second counting wheel at both ends of the pre-compressed tube, the required reserved length at both ends of the pre-compressed tube is determined. This length is the required assembly length for the heating element. Thus, the number of rotations of the second counting wheel and the corresponding contact time facilitate the determination of the positions of the front and rear ends of the middle section of the pre-compressed tube, i.e., the positioning coordinates of the middle endpoint of the pre-compressed tube.

[0062] S400: Perform a mid-section extension operation on the pre-compressed tube body according to the mid-end positioning coordinates to obtain the heating tube.

[0063] In this embodiment, the distance between the second counting wheel and the central extension drive wheel is fixed, as is the transmission rate of the pre-compressed tube. Once the positioning coordinates of the central endpoint of the pre-compressed tube are determined, the time it takes for the front and rear ends of the pre-compressed tube to reach the position of the central extension drive wheel is also determined. Thus, when the total tube length measured in a single tube length measurement is less than a predetermined length, the tube shrinking controller sends a start signal to the central extension fine-tuner through the central compression tube end, causing the central extension fine-tuner to control the central extension drive wheel and the central extension driven wheel to extend the central part of the pre-compressed tube. Conversely, when the total tube length measured in a single tube length measurement is greater than or equal to the predetermined length, the tube shrinking controller sends a stop signal to the central extension fine-tuner through the central compression tube end. At this point, the length of the pre-compressed tube has reached the target, and no further extension is required.

[0064] In this case, the "less than" situation usually means that the total length of the pre-compressed tube measured after passing through the first coil counter is 2mm to 3mm shorter than the predetermined length. If the total length of the pre-compressed tube is shorter than the predetermined length by more than the safe range of 2mm to 3mm, that is, the total length of the pre-compressed tube is too short, the middle extension fine-tuning device will not be activated, and the tube will be marked as a defective product and rejected.

[0065] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent disclosure should be determined by the appended claims.

Claims

1. A linear production device for heating tubes, characterized in that, include: A pre-compressed tube assembly, the pre-compressed tube assembly having a tube body conveying channel for conveying a tube body to be compressed, and the extrusion end of the pre-compressed tube assembly for extruding the tube body to be compressed to form a pre-compressed tube body; A pipe length measuring component is located at the outlet of the pipe conveying channel. The pipe length measuring component includes a pipe conveyor belt, a first pipe length measuring element, and a second pipe length measuring element. The first pipe length measuring element is disposed near the outlet of the pipe conveying channel and is used to measure the total length of the pre-compressed pipe. The pipe conveyor belt is located between the first pipe length measuring element and the second pipe length measuring element and is used for linearly transporting the pre-compressed pipe. The second tube length measuring device is used to mark the positioning coordinates of the middle end point of the pre-compressed tube body; A central extension assembly is located on the side of the second tube length measuring element away from the tube body conveyor belt, and the central extension assembly is used for central extension extrusion of the pre-compressed tube body.

2. The linear production device for heating tubes according to claim 1, characterized in that, The pre-compression tube assembly includes a pre-compression tube housing and a pre-compression tube device. The pre-compression tube device includes a pre-compression tube motor, a pre-compression tube drive wheel, a pre-compression tube driven wheel, and a pre-compression drive wheel mounting box. The pre-compression tube motor is connected to the pre-compression tube housing, and the rotating shaft of the pre-compression tube motor is fixedly connected to the pre-compression tube drive wheel. The pre-compression tube drive wheel and the pre-compression tube driven wheel are both rotatably mounted on the pre-compression drive wheel mounting box, which is located inside the pre-compression tube housing. The pre-compression tube drive wheel and the pre-compression tube driven wheel are arranged opposite to each other, and the pre-compression tube drive wheel and the pre-compression tube driven wheel form the tube conveying channel.

3. The linear production device for heating tubes according to claim 2, characterized in that, The pre-compression drive wheel mounting box includes a first box body, a first drive wheel bearing, a second drive wheel bearing, a first gear, and a second gear. The first box body is disposed inside the pre-compression tube housing. The first box body has a first through hole and a second through hole. The first drive wheel bearing passes through the first through hole. The central shaft of the first drive wheel bearing is fixedly connected to the rotating shaft of the pre-compression tube motor. The first gear and the pre-compression tube drive wheel are respectively sleeved at both ends of the central shaft of the first drive wheel bearing. The second drive wheel bearing passes through the second through hole. The second gear and the pre-compression tube driven wheel are respectively sleeved at both ends of the central shaft of the second drive wheel bearing. The first gear and the second gear are meshed with each other.

4. The linear production device for heating tubes according to claim 3, characterized in that, The pre-compression drive wheel mounting box also includes a pre-compression tube fine adjuster, which is connected to the inner wall of the first box body. The pre-compression tube fine adjuster is also sleeved on the outer ring of the second drive wheel bearing. The pre-compression tube fine adjuster is used to adjust the distance between the second drive wheel bearing and the first drive wheel bearing, as well as to adjust the extension contact time between the first gear and the second gear and the tube body to be compressed.

5. The linear production device for heating tubes according to claim 4, characterized in that, The pre-compression moving wheel mounting box also includes a pre-compression fine-tuning spring, which is connected to the telescopic end of the pre-compression tube fine-tuner and the outer ring of the first moving wheel bearing.

6. The linear production apparatus for heating tubes according to claim 1, characterized in that, The first tube length measuring device includes a first measuring bracket, a first coil counter, a first coil counting wheel, and a first support wheel. The first coil counter is disposed on the first measuring bracket, and the coil counting shaft of the first coil counter is connected to the first coil counting wheel. The first support wheel is rotatably disposed on the first measuring bracket, and the first support wheel and the first coil counting wheel are disposed opposite to each other. The first support wheel and the first coil counting wheel are used to slide against the pre-compressed tube body to measure the total length of the pre-compressed tube body.

7. The linear production apparatus for heating tubes according to claim 6, characterized in that, The first tube length measuring device further includes a first measuring slide plate, a first lifting cylinder, and a first buffer spring. The first measuring slide plate is slidably mounted on the first measuring bracket, and the first lap counter is connected to the first measuring slide plate. The first lifting cylinder is fixed on the first measuring bracket, and the lifting end of the first lifting cylinder is connected to the first measuring slide plate so that the first lap counter wheel moves away from or closer to the first support wheel. The first buffer spring is connected to both the first measuring slide plate and the first measuring bracket. And / or, the first tube length measuring device further includes at least two first tube-strapping rollers, the first tube-strapping rollers being rotatably mounted on the first measuring bracket, and a pre-compressed tube body being transmitted between the at least two first tube-strapping rollers; And / or, the first pipe length measuring device further includes a first measuring sensor, which is disposed on the first measuring bracket, and the first measuring sensor is used to sense the pre-compressed pipe output from the outlet of the pipe conveying channel.

8. The linear production device for heating tubes according to claim 1, characterized in that, The second pipe length measuring device includes a second measuring bracket, a second coil counter, a second coil counting wheel, and a second support wheel. The second coil counter is disposed on the second measuring bracket, and the coil counting shaft of the second coil counter is connected to the second coil counting wheel. The second support wheel is rotatably disposed on the second measuring bracket, and the second support wheel is disposed opposite to the second coil counting wheel. The second support wheel and the second coil counting wheel are used to slide against the pre-compressed pipe body to mark the positioning coordinates of the middle end point of the pre-compressed pipe body.

9. The linear production apparatus for heating tubes according to claim 8, characterized in that, The second tube length measuring device also includes a second measuring slide plate, a second lifting cylinder, and a second buffer spring. The second measuring slide plate is slidably mounted on the second measuring bracket, and the second lap counter is connected to the second measuring slide plate. The second lifting cylinder is fixed on the second measuring bracket, and the lifting end of the second lifting cylinder is connected to the second measuring slide plate so that the second lap counter wheel moves away from or closer to the second support wheel. The second buffer spring is connected to both the second measuring slide plate and the second measuring bracket. And / or, the second tube length measuring device further includes at least two second tube-strapping rollers, the second tube-strapping rollers being rotatably mounted on the second measuring bracket, and a pre-compressed tube body being transmitted between the at least two second tube-strapping rollers; And / or, the second tube length measuring device further includes a second measuring sensor, which is disposed on the second measuring bracket and is used to sense the pre-compressed tube output by the tube conveyor belt.

10. The linear production apparatus for heating tubes according to claim 1, characterized in that, The central extension assembly includes a central extension housing and a central extension device. The central extension device includes a central extension motor, a central extension drive wheel, a central extension driven wheel, and a central drive wheel mounting box. The central extension motor is connected to the central extension housing, and the rotating shaft of the central extension motor is fixedly connected to the central extension drive wheel. The central extension drive wheel and the central extension driven wheel are both rotatably mounted on the central drive wheel mounting box. The central extension drive wheel and the central extension driven wheel are arranged opposite to each other. The central extension drive wheel and the central extension driven wheel are used to compress and extend the central part of the pre-compressed tube. The central drive wheel mounting box includes a second box body, a third drive wheel bearing, a fourth drive wheel bearing, a third gear, and a fourth gear. The second box body is disposed on the central extension housing. The second box body has a third through hole and a fourth through hole. The third drive wheel bearing passes through the third through hole and is fixedly connected to the rotating shaft of the central extension motor. The third gear and the central extension drive wheel are respectively sleeved at both ends of the third drive wheel bearing. The fourth drive wheel bearing passes through the fourth through hole and the fourth gear and the central extension driven wheel are respectively sleeved at both ends of the fourth drive wheel bearing. The third gear and the fourth gear are meshed with each other. The central drive wheel mounting box also includes a central extension fine adjuster, which is connected to the inner wall of the second box body. The central extension fine adjuster is also sleeved on the fourth drive wheel bearing. The central extension fine adjuster is used to adjust the distance between the fourth drive wheel bearing and the third drive wheel bearing, as well as to adjust the contact time between the third gear and the fourth gear and the central extension of the pre-compression tube body. The central drive wheel mounting box also includes a central fine-tuning spring, which is connected to the central extension fine-tuner and the third drive wheel bearing.

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