A spiral pipe bending device

Abstract

This invention discloses a spiral pipe bending device, relating to the field of spiral pipe bending processing technology. The invention includes a rotatable hollow pipe bending mold, around which a steel pipe is wound. To address the thermal expansion problem caused by heating the high-temperature steel pipe to the mold, cooling water is introduced into the mold, and a cooling channel and heat dissipation mechanism are provided, including a flow guide cavity, heat sink fins, and a motor-driven cooling fan, forming a highly efficient cooling circulation system. Simultaneously, an auxiliary pressure relief channel and pressure relief valve are provided to prevent overpressure damage caused by blockage of the cooling channel. The device uses pins during the bending process to prevent the steel pipe from separating from the mold, and a limiting outer shell is added after forming to reduce deformation caused by residual stress.

Description

Technical Field

[0001] This invention relates to the field of spiral pipe bending technology, specifically to a spiral pipe bending device. Background Technology

[0002] Traditional spiral bending processes cause the high-temperature steel pipe to transfer heat to the mold during winding, leading to thermal expansion of the mold and an increase in diameter. This results in the actual diameter of the spiral pipe exceeding expectations and failing to meet stringent dimensional requirements. Traditional equipment typically lacks an effective mold cooling system, causing the mold temperature to rise continuously during operation. This not only exacerbates the thermal expansion problem but can also damage the equipment or shorten its lifespan. Furthermore, current technologies lack safety mechanisms to prevent overpressure caused by blocked cooling channels, increasing operational risks. Additionally, traditional methods fail to effectively address residual stress rebound and coil separation after bending. The bent steel pipe may deform during cooling, affecting the product's shape and structural integrity. This necessitates additional processing steps, increasing production costs and scrap rates. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a spiral pipe bending device, comprising a hydraulic tank, a hydraulic gearbox, an adjustable height fixing box, a base frame, a movable guide rail, a guide rail bracket, a pipe bending membrane, a membrane bracket, and fixing bolts; the hydraulic tank and the hydraulic gearbox are connected by matching hydraulic pipes; the hydraulic gearbox is mounted on the adjustable height fixing box; the adjustable height fixing box is mounted on the base frame, and the guide rail bracket is mounted on the base frame; the movable guide rail is mounted on the guide rail bracket, and the movable guide rail is driven by an independent drive unit to slide on the guide rail bracket; one end of the pipe bending membrane rotating shaft is fixedly mounted on the output end of the hydraulic gearbox, and the other end of the pipe bending membrane rotating shaft is rotatably mounted on the membrane bracket, and the membrane bracket is provided with an independent and easily detachable retaining ring to prevent the rotating shaft of the pipe bending membrane from separating from the membrane bracket.

[0004] Preferably, the mounting connection between the hydraulic gearbox and the adjustable height fixing box is provided with mutually cooperating positioning pin holes and threaded holes; the mounting connection between the base frame and the adjustable height fixing box is provided with mutually cooperating positioning pin holes and threaded holes; the mounting connection between the guide rail bracket and the base frame is provided with mutually cooperating positioning pin holes and threaded holes; the base frame and the diaphragm bracket are provided with mutually cooperating positioning pin holes and threaded holes, and the bottom of the diaphragm bracket is fixed to the base frame in a way that facilitates disassembly, so as to facilitate the separation of the rotating shaft of the bent tube diaphragm from the diaphragm bracket; the connection between the movable guide rail and the guide rail bracket is provided with multiple mutually cooperating movable pulleys; the bent tube diaphragm is fixed to the output end of the hydraulic gearbox through mutually cooperating positioning pin holes and threaded holes; pins and fixing bolts are respectively provided in the positioning pin holes and threaded holes.

[0005] Preferably, the interior of the curved membrane is hollow, and the pivot at the center of the curved membrane is connected to the interior of the curved membrane, with both ends of the pivot being open. A separating heat-conducting plunger is sealed in the middle of the interior of the curved membrane, dividing the interior space of the curved membrane into two parts. A heat-absorbing channel is provided on the inner wall of the curved membrane to connect the two divided spaces inside the curved membrane, and an auxiliary pressure relief channel is provided through the pivot of the separating heat-conducting plunger.

[0006] Preferably, a pressure relief chamber is provided in the middle of the axis of the separating temperature-conducting plunger. A support slide frame is fixed on the inner wall of the pressure relief chamber. Multiple guide support slides are slidably arranged on the support slide frame. One end of each guide support slide is fixedly engaged with a blocking pressure relief valve plate. A reset compression spring is arranged around each guide support slide. The two ends of the reset compression spring are fixedly engaged with the blocking pressure relief valve plate and the support slide frame. The blocking pressure relief valve plate is in contact with and sealed with the auxiliary pressure relief channel. The auxiliary pressure relief channel is divided into two ends by the pressure relief chamber. The two auxiliary pressure relief channels are connected to the pressure relief chamber.

[0007] Preferably, the output end of the hydraulic gearbox adopts a through-type transmission tube shaft, and the interior of the transmission tube shaft is connected to the interior of the bent tube diaphragm; the base frame is also fixed with a support panel and two auxiliary brackets in a way that is easy to disassemble, and the auxiliary brackets and the support panel are fixedly fitted together. A second guide inner ring cavity is rotatably installed on one of the auxiliary brackets. The second guide inner ring cavity is fitted with the transmission tube shaft by a rotational seal. A second guide outer ring cavity is provided on the outside of the second guide inner ring cavity. A first guide outer ring cavity is fixedly connected to the side of the second guide outer ring cavity. A first guide inner ring cavity coaxial with the second guide inner ring cavity is provided at the inner axis of the first guide outer ring cavity.

[0008] Preferably, the inner cavity of the second flow guide and the outer cavity of the second flow guide are connected by a second heat sink arranged in a plurality of circular arrays; the inner cavity of the first flow guide and the outer cavity of the first flow guide are connected by a first heat sink arranged in a plurality of circular arrays.

[0009] Preferably, an input rotating shaft tube is rotatably mounted on another auxiliary bracket, and the input rotating shaft tube is rotatably sealed with the first guide inner ring cavity. Two fixedly fitted central gears and a cooling fan are rotatably sleeved on the outer surface of the input rotating shaft tube.

[0010] Preferably, three planetary gears are rotatably mounted on the support panel, and the three planetary gears mesh with the central gear for transmission. An outer ring gear bracket is also fixedly mounted on the input rotating shaft tube, and an outer ring gear that meshes with the three planetary gears is fixed on the outer ring gear bracket.

[0011] Preferably, a heat dissipation drive motor is also fixed on the support panel, and the heat dissipation drive motor is connected to the input rotating shaft tube by a transmission belt.

[0012] Compared with the prior art, the present invention has the following advantages: (1) The present invention has a hollow structure inside the bending tube membrane and cools the bending tube membrane by introducing cooling water inside. This design effectively prevents the high-temperature steel pipe from heating the bending tube membrane during the winding process, avoids the membrane from increasing in diameter due to thermal expansion, thereby ensuring the accuracy of the finished diameter of the spiral tube and reducing the dimensional error caused by temperature changes; (2) The present invention is equipped with a complex cooling circulation system, including the first and second guide inner ring cavity and outer ring cavity, as well as multiple heat sinks and cooling fans. Cooling water circulates in the system, effectively removing heat. At the same time, an auxiliary pressure relief channel and a blocking pressure relief valve are set. When the cooling channel is blocked and the internal pressure rises, it can automatically open to relieve pressure, prevent seal damage caused by overpressure, and ensure the safety and reliability of the equipment; (3) The bending tube membrane of the present invention is provided with a pin that can restrict the separation of the steel pipe and the membrane, ensuring that the steel pipe is always in close contact with the membrane surface during the bending process. This design avoids displacement or slippage of the steel pipe during bending, ensuring a uniform shape of the spiral pipe after bending and improving the forming quality of the product; (4) After the pipe is bent, the present invention uses a fixed-diameter limiting shell to cover the spiral pipe to prevent radial stress rebound and layer rebound of the bent pipe. This measure ensures that the spiral pipe maintains its shape during cooling and reduces deformation caused by the release of internal stress in the material. Attached Figure Description

[0013] Figure 1 This is a front view of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the hydraulic tank structure of the present invention.

[0015] Figure 3 This is a schematic diagram of the curved tube membrane structure of the present invention.

[0016] Figure 4 This is a schematic diagram of the internal structure of the curved tube membrane of the present invention.

[0017] Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point A in the middle.

[0018] Figure 6 This is a schematic diagram of the structure of the outer ring toothed bracket of the present invention.

[0019] Figure 7 This is a structurally exploded view of the central gear in this invention.

[0020] Figure 8 This is a schematic diagram of the structure of the heat sink in this invention.

[0021] In the diagram: 101-Hydraulic tank; 102-Hydraulic gearbox; 103-Adjustable height fixed box; 104-Base frame; 105-Movable guide rail; 106-Guide rail bracket; 107-Bent tube diaphragm; 108-Diaphragm bracket; 109-Fixing bolt; 110-Transmission tube shaft; 111-Auxiliary bracket; 112-Support panel; 113-Cooling drive motor; 114-Transmission belt; 115-Input rotary shaft tube; 116-Heat absorption channel; 117-Divider temperature-conducting plunger; 118-Auxiliary vent 119-Pressure relief chamber; 120-Plugging pressure relief valve plate; 121-Guide support slide rod; 122-Reset compression spring; 123-Slide frame for support slide rod; 124-Outer ring gear bracket; 125-Outer ring gear; 126-Planetary gear; 127-Center gear; 128-First guide outer ring cavity; 129-Second guide outer ring cavity; 130-Second heat sink; 131-First heat sink; 132-Second guide inner ring cavity; 133-First guide inner ring cavity; 134-Cooling fan. Detailed Implementation

[0022] The following is in conjunction with the appendix Figures 1-8 The technical solution of the present invention will be further illustrated through specific embodiments.

[0023] This invention provides a spiral pipe bending device, comprising a hydraulic tank 101, a hydraulic gearbox 102, an adjustable height fixing box 103, a base frame 104, a movable guide rail 105, a guide rail bracket 106, a pipe bending diaphragm 107, a diaphragm bracket 108, and fixing bolts 109; the hydraulic tank 101 and the hydraulic gearbox 102 are connected by matching hydraulic pipes; the hydraulic gearbox 102 is mounted on the adjustable height fixing box 103; the adjustable height fixing box 103 is mounted on the base frame 104, and the guide rail bracket 106 is mounted on the base frame 104. 4. The movable guide rail 105 is mounted on the guide rail bracket 106 and is driven by an independent drive unit to slide on the guide rail bracket 106. One end of the rotating shaft of the bent tube diaphragm 107 is fixedly mounted on the output end of the hydraulic gearbox 102, and the other end of the rotating shaft of the bent tube diaphragm 107 is rotatably mounted on the diaphragm bracket 108. The diaphragm bracket 108 is provided with an independent and easily removable retaining ring to prevent the rotating shaft of the bent tube diaphragm 107 from separating from the diaphragm bracket 108. The mounting connection between the hydraulic gearbox 102 and the adjustable height fixing box 103 is provided with mutually cooperating positioning pin holes and threaded holes; the mounting connection between the base frame 104 and the adjustable height fixing box 103 is provided with mutually cooperating positioning pin holes and threaded holes; the mounting connection between the guide rail bracket 106 and the base frame 104 is provided with mutually cooperating positioning pin holes and threaded holes; the base frame 104 and the diaphragm bracket 108 are provided with mutually cooperating positioning pin holes and threaded holes, and the bottom of the diaphragm bracket 108 is fixedly installed with the base frame 104 in a way that is easy to disassemble, so that the rotation axis of the bent tube diaphragm 107 can be separated from the diaphragm bracket 108; the connection between the movable guide rail 105 and the guide rail bracket 106 is provided with multiple mutually cooperating movable pulleys; the bent tube diaphragm 107 is fixed to the output end of the hydraulic gearbox 102 through mutually cooperating positioning pin holes and threaded holes; pins and fixing bolts 109 are respectively provided in the positioning pin holes and threaded holes.

[0024] The curved membrane 107 is hollow inside, and the pivot at the center of the curved membrane 107 is connected to the inside of the curved membrane 107. Both ends of the pivot are open. A separating heat-conducting plunger 117 is sealed in the middle of the inside of the curved membrane 107. The separating heat-conducting plunger 117 divides the internal space of the curved membrane 107 into two parts. A heat absorption channel 116 is opened on the inner wall of the curved membrane 107 to connect the two divided spaces inside the curved membrane 107. An auxiliary pressure relief channel 118 is provided through the pivot of the separating heat-conducting plunger 117. A pressure relief chamber 119 is provided in the middle of the axis of the separating temperature-conducting plunger 117. A support slide rod sliding frame 123 is fixed on the inner wall of the pressure relief chamber 119. Multiple guide support slide rods 121 are slidably arranged on the support slide rod sliding frame 123. One end of all guide support slide rods 121 is fixedly engaged with the blocking pressure relief valve plate 120. A reset compression spring 122 is arranged around each guide support slide rod 121. The two ends of the reset compression spring 122 are fixedly engaged with the blocking pressure relief valve plate 120 and the support slide rod sliding frame 123. The blocking pressure relief valve plate 120 is in contact and sealed with the auxiliary pressure relief channel 118. The auxiliary pressure relief channel 118 is divided into two ends by the pressure relief chamber 119. The two auxiliary pressure relief channels 118 are connected to the pressure relief chamber 119. The output end of the hydraulic gearbox 102 adopts a transmission tube shaft 110 that runs through the front and rear. The interior of the transmission tube shaft 110 is connected to the interior of the bent tube membrane 107. The base frame 104 is also fixed with a support panel 112 and two auxiliary brackets 111 in a way that is easy to disassemble. The auxiliary brackets 111 and the support panel 112 are fixedly fitted. A second guide inner ring cavity 132 is rotatably installed on one of the auxiliary brackets 111. The second guide inner ring cavity 132 and the transmission tube shaft 110 are fitted with a rotary seal. A second guide outer ring cavity 129 is provided on the outside of the second guide inner ring cavity 132. A first guide outer ring cavity 128 is fixedly connected to the side of the second guide outer ring cavity 129. A first guide inner ring cavity 133, which is coaxial with the second guide inner ring cavity 132, is provided at the inner axis of the first guide outer ring cavity 128. The inner cavity 132 and the outer cavity 129 of the second flow guide are connected by a plurality of second heat sinks 130 arranged in a circular array; the inner cavity 133 and the outer cavity 128 of the first flow guide are connected by a plurality of first heat sinks 131 arranged in a circular array. An input rotating shaft tube 115 is rotatably mounted on another auxiliary bracket 111. The input rotating shaft tube 115 is rotatably sealed with the inner cavity 133 of the first flow guide. Two fixedly fitted central gears 127 and a cooling fan 134 are rotatably sleeved on the outer surface of the input rotating shaft tube 115.Three planetary gears 126 are rotatably mounted on the support panel 112, and the three planetary gears 126 mesh with the central gear 127 for transmission. An outer ring gear bracket 124 is also fixedly mounted on the input rotating shaft tube 115, and an outer ring gear ring 125 that meshes with the three planetary gears 126 is fixed on the outer ring gear bracket 124. A heat dissipation drive motor 113 is also fixed on the support panel 112, and the heat dissipation drive motor 113 is connected to the input rotating shaft tube 115 by a transmission belt 114.

[0025] The working principle of the spiral pipe bending device disclosed in this invention is as follows: A steel pipe is placed on a movable guide rail 105 (which guides the steel pipe), and a pipe bending diaphragm 107 is inserted (the pipe bending diaphragm 107 is equipped with pins that prevent separation between the steel pipe and the diaphragm). The pipe bending diaphragm 107 is rotated via a hydraulic tank 101 and a hydraulic gearbox 102 (the output rotation shaft of the hydraulic gearbox 102 is a transmission tube shaft 110, which runs through the front and rear, resulting in two coaxial output ends). This allows the steel pipe to be wound around the outer wall of the fixed-diameter pipe bending diaphragm 107. The positioning angle of the pipe bending diaphragm 107 and the movement of the steel pipe within the movable guide rail 105, along with the movement of the movable guide rail 105 on the guide rail bracket 106, ensure that multiple turns of the bent pipe are tightly fitted together after bending. After bending, the diaphragm bracket 108 is opened, and a fixed-diameter limiting shell is placed over the formed bent pipe to prevent radial stress rebound and layer rebound. In practice, the specific pipe specifications, bend diameter, and bend angle can be adjusted by the bend molding and movable guide rail according to the actual application.

[0026] In most cases, to prevent radial stress rebound and coil rebound in the bend, the steel pipe is heated before bending and then wound onto the bending die 107 for processing, followed by cooling. However, the high-temperature steel pipe, when wound onto the bending die 107, heats the bending die 107, causing a change in its diameter, which in turn leads to a change in the diameter of the wound spiral pipe (too large). To reduce this error, the bending die 107 is hollow inside, and cooling water is circulated into it to cool the die 107 itself, keeping its temperature within a certain range, thereby controlling and reducing the error. Specifically, a water tank is installed at the bottom of the base frame 104. Cooling water from the water tank is then pumped and piped to the input rotary shaft tube 115 (the connection between the water pipe and the input rotary shaft tube 115 uses a rotary seal). The cooling water then enters the input rotary shaft tube 115, then the first inner guide cavity 133, and sequentially passes through the first heat sink 131, the first outer guide cavity 128, the second outer guide cavity 129, and the second heat sink 130 into the second inner guide cavity 132. It then passes through the transmission tube shaft 110 into the bent tube membrane 107, flows through the heat absorption channel 116 to the other side of the bent tube membrane 107, and then falls back into the water tank at the bottom for a continuous cycle (the bottom of the water tank can be inclined so that the water pump is located at the bottom). The higher position of the surface can effectively reduce impurities entering the water pump. At this time, the bent tube membrane 107 can be cooled down. At the same time, if there are too many impurities in the circulating cooling water, the heat absorption channel 116 will be blocked (because the cross-sectional area of ​​the heat absorption channel 116 is small). This will increase the pressure inside the bent tube membrane 107. At this time, the blocking pressure relief valve plate 120 in the auxiliary pressure relief channel 118 can play a role. Under the pressure, the blocking pressure relief valve plate 120 is separated from the auxiliary pressure relief channel 118 (guides the support slide rod 121 and the support slide rod sliding frame 123 to slide relative to each other, and the reset compression spring 122 is deformed). Then, the cooling water flows through the auxiliary pressure relief channel 118 to the other end of the bent tube membrane 107 to prevent the rotary seal from being damaged due to excessive pressure. The circulating cooling water needs to be cooled before re-entering the bent tube membrane 107, so the cooling drive motor 113 is started. The output shaft of the cooling drive motor 113 drives the input rotating shaft tube 115 to rotate via the transmission belt 114. The input rotating shaft tube 115 drives the outer ring gear bracket 124 to rotate. The outer ring gear bracket 124 drives the outer ring gear 125 to rotate. The outer ring gear 125 drives the central gear 127 to rotate via the planetary gear 126. The central gear 127 drives the cooling fan 134 to rotate. The cooling fan 134 drives the external air to blow towards the second heat sink 130 and the first heat sink 131, thereby cooling the flowing cooling water.

Claims

1. A helical bend apparatus, characterized by: The hydraulic tank (101), the hydraulic gearbox (102) are matched and connected by matched hydraulic pipes; the hydraulic gearbox (102) is installed on the height-adjustable fixed box (103); the height-adjustable fixed box (103) is installed on the chassis (104), and the guide rail bracket (106) is installed on the chassis (104); the movable guide rail (105) is installed on the guide rail bracket (106), and the movable guide rail (105) is driven by an independent driving unit to slide on the guide rail bracket (106); one end of the rotating shaft of the bent pipe tire membrane (107) is fixedly installed on the output end of the hydraulic gearbox (102), and the other end of the rotating shaft of the bent pipe tire membrane (107) is rotatably arranged on the tire membrane bracket (108), and the tire membrane bracket (108) is provided with an independent and detachable buckle to prevent the rotating shaft of the bent pipe tire membrane (107) from being separated from the tire membrane bracket (108); The inside of the bent pipe tire membrane (107) is hollow, the rotating shaft at the center of the bent pipe tire membrane (107) is in communication with the inside of the bent pipe tire membrane (107), both ends of the rotating shaft are open, a partition temperature guide plunger (117) is arranged in the middle of the inside of the bent pipe tire membrane (107), the partition temperature guide plunger (117) divides the inside space of the bent pipe tire membrane (107) into two parts, a heat absorption channel (116) is formed in the inner wall of the bent pipe tire membrane (107), which is used for connecting the two parts of the inside space of the bent pipe tire membrane (107), and an auxiliary pressure relief channel (118) is arranged at the center of the partition temperature guide plunger (117); a pressure relief chamber (119) is formed in the center of the partition temperature guide plunger (117), a support slide rod sliding bracket (123) is fixedly arranged on the inner wall of the pressure relief chamber (119), a plurality of guide support slide rods (121) are slidably arranged on the support slide rod sliding bracket (123), one end of each guide support slide rod (121) is fixedly connected with a blocking pressure relief valve piece (120), a reset compression spring (122) is arranged around each guide support slide rod (121), and the other end of the reset compression spring (122) is fixedly connected with the blocking pressure relief valve piece (120) and the support slide rod sliding bracket (123), wherein the blocking pressure relief valve piece (120) is in sealing contact with the auxiliary pressure relief channel (118), the auxiliary pressure relief channel (118) is divided into two ends by the pressure relief chamber (119), and the two ends of the auxiliary pressure relief channel (118) are in communication with the pressure relief chamber (119); wherein the output end of the hydraulic gearbox (102) adopts a front-and-back-through transmission pipe shaft (110), the inside of the transmission pipe shaft (110) is in communication with the inside of the bent pipe tire membrane (107). ​ The support panel (112) and the two auxiliary supports (111) are fixed on the chassis (104) in a detachable manner, and the auxiliary supports (111) and the support panel (112) are fixedly matched, one of the auxiliary supports (111) is rotatably installed with a second flow guide inner ring cavity (132), the second flow guide inner ring cavity (132) is rotatably and sealingly matched with the transmission pipe shaft (110), the outer side of the second flow guide inner ring cavity (132) is provided with a second flow guide outer ring cavity (129), the side of the second flow guide outer ring cavity (129) is fixedly communicated with a first flow guide outer ring cavity (128), the inner side of the first flow guide outer ring cavity (128) is provided with a first flow guide inner ring cavity (133) coaxial with the second flow guide inner ring cavity (132); the second flow guide inner ring cavity (132) and the second flow guide outer ring cavity (129) are communicated by a plurality of circularly arranged second heat sinks (130); the first flow guide inner ring cavity (133) and the first flow guide outer ring cavity (128) are communicated by a plurality of circularly arranged first heat sinks (131).

2. A helical bend apparatus according to claim 1, characterised in that: The mounting connection of the hydraulic gearbox (102) and the height-adjustable fixed box (103) is provided with a positioning pin hole and a threaded hole matched with each other; the mounting connection of the chassis (104) and the height-adjustable fixed box (103) is provided with a positioning pin hole and a threaded hole matched with each other; the mounting connection of the guide rail bracket (106) and the chassis (104) is provided with a positioning pin hole and a threaded hole matched with each other; the chassis (104) and the tire membrane bracket (108) are provided with a positioning pin hole and a threaded hole matched with each other, and the bottom of the tire membrane bracket (108) and the chassis (104) are fixedly installed in a detachable manner, so that the rotating shaft of the bent pipe tire membrane (107) can be separated from the tire membrane bracket (108); the connection of the movable guide rail (105) and the guide rail bracket (106) is provided with a plurality of movable pulleys matched with each other; the bent pipe tire membrane (107) and the output end of the hydraulic gearbox (102) are fixed through a positioning pin hole and a threaded hole matched with each other; the positioning pin hole and the threaded hole are respectively provided with a pin and a fixed bolt (109).

3. A helical bend apparatus according to claim 2, wherein: The other auxiliary support (111) is rotatably installed with an input rotating shaft pipe (115), the input rotating shaft pipe (115) is rotatably and sealingly matched with the first flow guide inner ring cavity (133), the outer surface of the input rotating shaft pipe (115) is rotatably sleeved with a fixedly matched central gear (127) and a heat dissipation fan (134); the support panel (112) is rotatably installed with three planetary gears (126), the three planetary gears (126) are meshed and transmitted with the central gear (127), the input rotating shaft pipe (115) is further fixedly provided with an outer ring gear support (124), the outer ring gear support (124) is fixedly provided with an outer ring gear (125) meshed and transmitted with the three planetary gears (126).

4. A helical bend apparatus according to claim 3, wherein: The support panel (112) is further fixedly provided with a heat dissipation driving motor (113), and the heat dissipation driving motor (113) and the input rotating shaft pipe (115) are drivingly connected through a transmission belt (114).

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