A stator core dryer for new energy vehicles

Abstract

This invention relates to the field of stator core drying technology, specifically a stator core dryer for new energy vehicles. It includes a stainless steel casing and a PLC intelligent controller mounted on its right side. A sealed door is connected to the front side of the stainless steel casing, and an air inlet pipe and an air outlet pipe are connected sequentially from top to bottom on the left side of the casing. A front support plate is connected to the front side of the rear support plate via a lifting and placing assembly. In this stator core dryer for new energy vehicles, the rear support plate drives the upper pressure rod and the limiting support rod to rotate, thereby enabling the upper pressure rod and the limiting support rod to automatically flip the stator core. This facilitates uniform and rapid drying of all surfaces of the stator core, achieving uniform heating and efficient drying. The upper pressure rod and the limiting support rod can tightly clamp and fix the stator core using rubber rings, preventing adjacent stator cores from colliding and scratching each other during horizontal shaking.

Description

Technical Field

[0001] This invention relates to the field of stator core drying technology, specifically a stator core dryer for new energy vehicles. Background Technology

[0002] The stator core is one of the core components of the drive motor in new energy vehicles. It is used to support the windings and transmit electromagnetic energy. It is a key component to maintain the normal operation of the motor. Therefore, the production quality of the stator core directly affects the performance of the motor and, consequently, the performance of the new energy vehicle. During the manufacturing process, the stator core needs to be cleaned to remove surface impurities. After cleaning, the stator core needs to be dried in a dryer to ensure that the surface is evenly dried and to prevent residual moisture from causing rust later. For example, the patent application with publication number "CN111900847A" entitled "A Stator Core Drying Equipment" discloses a process where a lifting door opens, a core placement tray containing the stator core is placed on a third conveyor line, and the tray is then transported to a lifting and transferring mechanism. This mechanism then transports the tray to an auxiliary conveyor line, which in turn transports it to a first conveyor line. Simultaneously, the lifting and transferring mechanism at the end of the first conveyor line transports the tray to a second conveyor line, continuing this process until both lines are filled with trays. The drying oven then begins drying. After drying, the trays are transported to a third conveyor line via the lifting and transferring mechanism for sorting and collecting the stator cores. The iron core placement tray can be reused. For example, the patent titled "A Drying Device for Motor Stator Iron Core" disclosed in the prior art with the publication number "CN117155048B" discloses that the door is opened and the slide is pulled forward by the handle. Then, the stator iron core is placed in the corresponding position of the placement slot of the placement tray. The slide is then pushed backward to the last end of the slide rail. The cylinder is activated and the lifting bracket is moved upward by the support rod. At this time, the supporting steel rope on the lifting bracket can lift the stator iron core upward. Its principle and function are to ensure uniform heating by reducing the contact area and improving drying efficiency. The motor is turned on to drive the transmission shaft to rotate, and the transmission shaft drives the rotating shaft to rotate through the transmission component. This can drive the stator iron core to perform horizontal circular motion, further improving the uniform heating area and improving drying efficiency and quality.

[0003] The existing dryers described above place the stator core to be dried directly into the placement slot of the placement tray, and then drive the stator core to make horizontal circular motion by rotating the shaft. However, they cannot self-flip the stator core, which results in slow drying efficiency for the bottom surface of the stator core and cannot dry all surfaces of the stator core evenly and quickly. This leads to localized overheating or incomplete drying of the stator core. Therefore, we propose a stator core dryer for new energy vehicles to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a stator core dryer for new energy vehicles, in order to solve the problems mentioned in the background art. Currently, the dryers on the market directly place the stator core to be dried in the placement slot of the placement tray, and then drive the stator core to make horizontal circular motion by rotating the shaft. However, the stator core cannot be self-turned, which makes the drying efficiency of the bottom surface of the stator core slow and unable to dry all surfaces of the stator core evenly and quickly, resulting in local overheating or incomplete drying of the stator core.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a stator core dryer for new energy vehicles, comprising a stainless steel shell and a PLC intelligent controller installed on its right side, wherein a sealing door is connected to the front side of the stainless steel shell, and an air inlet pipe and an air outlet pipe are connected sequentially from top to bottom on the left side of the stainless steel shell; a rear support plate is provided inside the stainless steel shell, and a front support plate is connected to the front side of the rear support plate through a lifting and placing component; support plates are rotatably installed at the rear end of the rear support plate and the front end of the front support plate, and a support frame is slidably connected to the outer side of the support plate; the rear support frame is fixedly installed inside the stainless steel shell; a bearing frame installed on the bottom surface of the front support frame is slidably connected to a groove opened inside the bottom surface of the stainless steel shell; a rotation control component is connected to the rear side of the rear support plate; and an electric heating component is installed inside the upper part of the stainless steel shell.

[0006] Preferably, two push columns are installed on the rear side of the sealing door, and the push columns push the support frame to move backward.

[0007] Preferably, the lifting and placing assembly includes a limiting rod installed on the rear side of the front support plate, and a guide groove is provided on the rear side of the front support plate, with the upper surface of the guide groove being an inclined surface.

[0008] Preferably, a vertical rod is installed in the groove on the front side of the rear support plate, and an upper pressure rod is installed through the outer side of the vertical rod. A return spring is nested on the upper outer side of the upper pressure rod. Rubber rings are installed on the outer sides of both the upper pressure rod and the limiting support rod. The front end of the upper pressure rod is inserted into the guide groove, and the upper pressure rod forms a lifting structure through the guide groove.

[0009] Preferably, the front side of the rear support plate has a connecting hole, the rear end of the limiting rod is inserted into the connecting hole, and both the rear support plate and the front support plate are arranged in a "T" shape.

[0010] Preferably, the rotation control assembly includes a first connecting rope wound around the outer side of the rear end of the rear support plate, and a first spiral spring is nested at the connection between the rear end of the rear support plate and the support plate, and the upper end of the first connecting rope is connected to the support frame through a guide wheel.

[0011] Preferably, a transmission gear is installed through the interior of the rear side of the stainless steel housing, and rack assemblies are meshed on both the upper and lower sides of the transmission gear, and the two rack assemblies are respectively installed on the rear side of the two support plates on the rear side.

[0012] Preferably, the upper and lower rows of rear support plates move towards each other.

[0013] Preferably, a single-rotation reciprocating screw is installed inside the left side of the stainless steel housing, and a fan blade assembly is installed on the outer middle of the single-rotation reciprocating screw, with an air inlet pipe correspondingly provided on the left side of the fan blade assembly.

[0014] Preferably, a crossbar is threadedly connected to the upper outer side of the single-rotor reciprocating screw, and the left end of the crossbar is engaged and slidably connected to a groove opened on the left inner wall of the stainless steel housing. A connecting sleeve is rotatably installed through the outer side of the crossbar, and a fan-shaped plate is fixed on the outer side of the connecting sleeve. A second connecting rope is wound around the outer side of one end of the connecting sleeve, and the upper end of the second connecting rope is connected to the housing on the bottom surface of the electric heating component. The other end of the connecting sleeve is connected to a second spiral spring nested on the outer side of the crossbar.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In this stator core dryer for new energy vehicles, the rear support plate drives the upper pressure rod and the limiting support rod to rotate, thereby enabling the upper pressure rod and the limiting support rod to automatically flip the stator core, facilitating uniform and rapid drying of all surfaces of the stator core in the later stage, achieving uniform heating and efficient drying of the stator core. The specific details are as follows: (1) When the transmission gear rotates, it drives the upper and lower rack assemblies to move towards each other, which in turn causes the rack assemblies to drive the two rear support plates to move towards each other, causing the upper and lower rear support plates and the front support plates to move towards each other. At the same time, the first connecting rope that is pulled drives the rear support plate to rotate, and the rear support plate drives the upper pressure rod and the limit support rod to rotate. Thus, the upper pressure rod and the limit support rod can automatically flip the stator core, which is convenient for the later uniform and fast drying of each surface of the stator core, so as to achieve the effect of uniform heating and efficient drying of the stator core. This is conducive to improving the production quality of the stator core and avoiding the stator core from affecting the overall performance of the motor and new energy vehicle in the later stage. Furthermore, the rubber rings installed at corresponding positions on the outer sides of the upper pressure rod and the limiting support rod allow the upper pressure rod and the limiting support rod to tightly clamp and fix the stator core through the rubber rings, preventing two adjacent stator cores from colliding with each other during horizontal shaking, thereby avoiding scratches on the surface of the stator core and facilitating the protection of the stator core.

[0016] (2) After the sealing door is closed, the push column automatically applies a backward thrust to the support frame, which in turn causes the support frame to move backward along the front support frame and the front support plate. At this time, the front end of the upper pressure rod is inserted into the guide groove, and the upper pressure rod is automatically moved downward through the guide groove with the inclined surface above, so that the upper pressure rod automatically clamps the stator core below. The clamping can also be automatically released later. The operation is convenient and no manual operation is required. (3) When hot air is injected into the stainless steel shell through the air inlet pipe, the hot air blows the fan blade assembly and the single-rotor reciprocating screw to rotate, so that the crossbar reciprocates and rises. At the same time, with the setting of the second connecting rope, the crossbar drives the fan plate to reciprocate and rise, and the fan plate can also reciprocate and rotate. Therefore, the fan plate can blow the hot air in the stainless steel shell downward, which can improve the flow of hot air in the stainless steel shell and improve the temperature uniformity in the stainless steel shell. This makes it easier for the dryer to dry all surfaces of the stator core evenly and quickly, thereby improving the production quality of the stator core and making it easier for the stator core to be used in the drive motor of new energy vehicle parts. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the opening structure of the sealing door of the present invention; Figure 3 This is a schematic diagram of the main cross-sectional structure of the stainless steel shell of the present invention; Figure 4 This is a schematic diagram of the crossbar structure from below in this invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the support frame of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the rear view of the front support plate structure of the present invention; Figure 8 This is a schematic diagram of the connection structure between the rear support plate and the support plate of the present invention; Figure 9 This is a schematic diagram of the separation structure of the rear support plate and the limiting rod of the present invention; Figure 10 This is a schematic diagram of the limiting support rod structure from below in this invention; Figure 11This is a schematic cross-sectional view of the front support plate of the present invention; Figure 12 This is a top view of the crossbar structure of the present invention; Figure 13 This is a schematic diagram of the separation structure of the crossbar and the fan-shaped plate of the present invention.

[0018] In the diagram: 1. Stainless steel casing; 2. Sealed door; 201. Push column; 3. PLC intelligent controller; 4. Air inlet pipe; 5. Air outlet pipe; 6. Support frame; 7. Support plate; 71. Rack assembly; 8. Bearing frame; 9. Electric heating assembly; 10. Single-rotor reciprocating screw; 101. Fan blade assembly; 11. Horizontal bar; 12. Rear support plate; 121. Vertical bar; 122. Return spring; 123. Upper pressure rod; 124. Rubber ring; 125. Connecting hole; 13. Front support plate; 131. Limiting rod; 132. Guide groove; 14. Transmission gear; 15. First spiral spring; 16. First connecting rope; 17. Fan plate; 171. Connecting sleeve; 172. Second spiral spring; 173. Second connecting rope. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-13 The present invention provides the following technical solution: Example 1: The stator core dryer for new energy vehicles in this example can not only automatically clamp and fix the stator core to prevent damage from collisions between adjacent stator cores, but also automatically flip the stator core, ensuring uniform and rapid drying of all surfaces. This achieves uniform heating and efficient drying, improving the overall performance of the motor and the new energy vehicle. See attached diagram for the specific structure. Figures 1-3 and appendix Figures 5-11As shown, the device includes a stainless steel housing 1 and a PLC intelligent controller 3 installed on its right side. A sealing door 2 is connected to the front side of the stainless steel housing 1, and an air inlet pipe 4 and an air outlet pipe 5 are connected sequentially from top to bottom on the left side of the stainless steel housing 1. A rear support plate 12 is provided inside the stainless steel housing 1, and a front support plate 13 is connected to the front side of the rear support plate 12 through a lifting and placing component. Support plates 7 are rotatably installed on the rear end of the rear support plate 12 and the front end of the front support plate 13. A support frame 6 is slidably connected to the outer side of the support plate 7, and the rear support frame 6 is fixedly installed inside the stainless steel housing 1. A carrier frame 8 installed on the bottom surface of the front support frame 6 is slidably connected to a groove opened inside the bottom surface of the stainless steel housing 1. A rotation control component is connected to the rear side of the rear support plate 12, and an electric heating component 9 is installed inside the upper part of the stainless steel housing 1.

[0021] Two push columns 201 are installed on the rear side of the sealing door 2, and the push columns 201 push the support frame 8 to move backward. The lifting and placing assembly includes a limiting rod 131 installed on the rear side of the front support plate 13, and a guide groove 132 is opened on the rear side of the front support plate 13. The upper surface of the guide groove 132 is inclined. A vertical rod 121 is installed in the groove on the front side of the rear support plate 12, and an upper pressure rod 123 is installed through the outer side of the vertical rod 121. A return spring 122 is nested on the upper outer side of the upper pressure rod 123. Rubber rings 124 are installed on the outer sides of both the upper pressure rod 123 and the limiting rod 131. The front end of the upper pressure rod 123 is inserted into the guide groove 132, and the upper pressure rod 123 forms a lifting structure through the guide groove 132. A connecting hole 125 is provided on the front side of the disc 12. The rear end of the limiting support rod 131 is inserted into the connecting hole 125. Both the rear support disc 12 and the front support disc 13 are arranged in a "T" shape. The rotation control component includes a first connecting rope 16 wound and installed on the outer side of the rear end of the rear support disc 12. A first spiral spring 15 is nested at the connection between the rear end of the rear support disc 12 and the support plate 7. The upper end of the first connecting rope 16 is connected to the support frame 6 through a guide wheel. A transmission gear 14 is installed through the interior of the rear side of the stainless steel housing 1. Both the upper and lower sides of the transmission gear 14 are meshed with rack assemblies 71. The two rack assemblies 71 are respectively installed on the rear sides of the two support plates 7. The upper and lower rows of rear support discs 12 move towards each other.

[0022] Open the sealing door 2, then manually pull the front support frame 6 forward. The support frame 8 then slides forward within the groove of the stainless steel housing 1. Next, manually or with a tool, place multiple stator cores into the six limiting rods 131 behind the front support plate 13. The two bottom limiting rods 131 then lift the bottom surface of the stator cores, while the two left and right limiting rods 131 clamp the sides of the stator cores. At this point, the rubber rings 124 on the outer side of the limiting rods 131 are in contact with the surface of the stator cores. After the stator cores are in place, push the front support frame 6 backward, allowing it to enter the stainless steel housing 1. The limiting rods 131 are now below the corresponding upper pressure rods 123. Then close the sealing door 2. When the sealing door 2 is closed, the push column 201 on the rear side contacts the support frame 8, and then applies a backward push force to the support frame 8. At this time, the support frame 8 drives the front support frame 6 to continue to move backward a certain distance. At this time, the rear end of the limit rod 131 is inserted into the corresponding connection hole 125, and the front end of the upper pressure rod 123 enters the guide groove 132. The guide groove 132 with the upper inclined surface automatically drives the upper pressure rod 123 to move downward. At this time, the rear end of the upper pressure rod 123 slides downward on the outside of the vertical rod 121, and the return spring 122 stores force, so that the upper pressure rod 123, together with the rubber ring 124, automatically clamps and fixes the stator core below, so as to avoid the two adjacent stator cores from colliding with each other when swaying horizontally, thereby avoiding scratches on the surface of the stator core.

[0023] Next, press the start switch on the PLC intelligent controller 3, and set the required temperature and drying time through the control panel on the PLC intelligent controller 3. The electric heating component 9 will then dry the stator core inside the stainless steel housing 1. At the same time, a certain amount of hot air is injected into the stainless steel housing 1 through the air inlet pipe 4. After a period of time, the air inside the stainless steel housing 1 is discharged through the air outlet pipe 5 for dehumidification. After the temperature reaches the set value, the electric heating component 9 in the dryer will automatically stop heating. Since this part is existing technology, it will not be described in detail here. Meanwhile, the servo motor drives the transmission gear 14 to reciprocate. When the transmission gear 14 reciprocates, it drives the two rack assemblies 71 to reciprocate. The two rack assemblies 71 drive the two support plates 7 on the rear side to reciprocate. When the support plate 7 on the upper rear side drives the rear support plate 12 to move to the left, the upper end of the first connecting rope 16 is pulled, causing the first connecting rope 16 to drive the rear support plate 12 to move to the left. 2. During rotation, the first spiral spring 15 stores energy, and the rear support plate 12 drives the upper pressure rod 123, the limiting support rod 131, and the front support plate 13 to rotate. Therefore, the upper pressure rod 123 and the limiting support rod 131 cooperate to automatically flip the inner stator core. This operation is repeated to facilitate even and rapid drying of all surfaces of the stator core, achieving uniform heating and efficient drying of the stator core. After the timer ends, the buzzer sounds, and then the sealing door 2 is opened. The front support frame 6 is pulled forward, and then the front end of the upper pressure rod 123 separates from the guide groove 132. At this time, the storage of the return spring 122 automatically drives the rear end of the upper pressure rod 123 to move upward and reset outside the vertical rod 121, so that the upper pressure rod 123 separates from the stator core. Therefore, the clamping can be automatically released, and then the stator core can be taken out. The operation is convenient, which helps to improve the quality of stator core production and manufacturing, and makes the stator core better improve the performance of motors and new energy vehicles.

[0024] Example 2: The stator core dryer for new energy vehicles in this example, based on Example 1, improves the flow of hot air within the stainless steel shell 1, thereby enhancing the temperature uniformity within the shell 1. This allows the dryer to dry all surfaces of the stator core evenly and quickly. The specific structure is shown in the attached diagram. Figures 3-4 and appendix Figures 12-13As shown, a single-rotor reciprocating screw 10 is installed inside the left side of the stainless steel housing 1, and a fan blade assembly 101 is installed on the middle outer side of the single-rotor reciprocating screw 10. An air inlet pipe 4 is correspondingly provided on the left side of the fan blade assembly 101. A crossbar 11 is threadedly connected to the upper outer side of the single-rotor reciprocating screw 10. The left end of the crossbar 11 is engaged and slidably connected to a groove opened on the left inner wall of the stainless steel housing 1. A connecting sleeve 171 is rotatably installed through the outer side of the crossbar 11. A fan plate 17 is fixed on the outer side of the connecting sleeve 171. A second connecting rope 173 is wound around the outer side of one end of the connecting sleeve 171. The upper end of the second connecting rope 173 is connected to the housing at the bottom of the electric heating assembly 9. The other end of the connecting sleeve 171 is connected to a second spiral spring 172 nested on the outer side of the crossbar 11.

[0025] When hot air is injected into the stainless steel housing 1 through the air inlet pipe 4, the hot air causes the fan blade assembly 101 to rotate, which in turn drives the single-rotor reciprocating screw 10 to rotate. The rotation of the single-rotor reciprocating screw 10 causes the outer threaded crossbar 11 to reciprocate upwards and downwards. When the crossbar 11 moves the fan plate 17 downwards, the upper end of the second connecting rope 173 is pulled, causing the connecting sleeve 171 to rotate outside the crossbar 11. At this time, the second spiral spring 172 stores energy, and the connecting sleeve 171 drives the corresponding fan plate 17 to rotate, causing the fan to... Plate 17 rotates from a horizontal position to an inclined position. When the crossbar 11 drives the fan plate 17 to move upward and reset, the second spiral spring 172 automatically drives the connecting sleeve 171 and the fan plate 17 to rotate in the opposite direction and reset. This operation is repeated, allowing the fan plate 17 to rotate reciprocally. Therefore, the fan plate 17 can easily fan the hot air inside the stainless steel shell 1 downward, which can improve the airflow of the hot air inside the stainless steel shell 1 and improve the temperature uniformity inside the stainless steel shell 1. This allows the dryer to dry all surfaces of the stator core evenly and quickly, thus completing a series of tasks.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stator core dryer for a new energy vehicle, comprising a stainless steel shell (1) and a PLC intelligent controller (3) installed on its right side, wherein a sealing door (2) is connected to the front side of the stainless steel shell (1), and an air inlet pipe (4) and an air outlet pipe (5) are connected sequentially from top to bottom on the left side of the stainless steel shell (1), characterized in that: The stainless steel housing (1) is provided with a rear support plate (12) inside, and the front side of the rear support plate (12) is connected to a front support plate (13) via a lifting and placing component. Support plates (7) are rotatably mounted on both the rear end of the rear support plate (12) and the front end of the front support plate (13). A support frame (6) is slidably connected to the outer side of the support plate (7). The rear support frame (6) is fixedly installed inside the stainless steel housing (1). A bearing frame (8) mounted on the bottom surface of the front support frame (6) is slidably connected to a groove opened inside the bottom surface of the stainless steel housing (1). A rotation control component is connected to the rear side of the rear support plate (12). An electric heating component (9) is installed inside the upper part of the stainless steel housing (1). The lifting and placing component... The mounting assembly includes a limiting rod (131) installed on the rear side of the front support plate (13), and a guide groove (132) is provided on the rear side of the front support plate (13). The upper surface of the guide groove (132) is inclined. A vertical rod (121) is installed in the groove on the front side of the rear support plate (12), and an upper pressure rod (123) is installed through the outer side of the vertical rod (121). A reset spring (122) is nested on the upper outer side of the upper pressure rod (123). Rubber rings (124) are installed on the outer sides of both the upper pressure rod (123) and the limiting rod (131). The front end of the upper pressure rod (123) is inserted into the guide groove (132), and the upper pressure rod (123) forms a lifting structure through the guide groove (132).

2. The stator core dryer for new energy vehicles according to claim 1, characterized in that: Two pushers (201) are installed on the rear side of the sealing door (2), and the pushers (201) push the support frame (8) to move backward.

3. The stator core dryer for new energy vehicles according to claim 1, characterized in that: The rear support plate (12) has a connecting hole (125) on its front side. The rear end of the limiting rod (131) is inserted into the connecting hole (125), and both the rear support plate (12) and the front support plate (13) are arranged in a "T" shape.

4. The stator core dryer for new energy vehicles according to claim 1, characterized in that: The rotation control assembly includes a first connecting rope (16) wound around the outer side of the rear end of the rear support plate (12), and a first spiral spring (15) is nested at the connection between the rear end of the rear support plate (12) and the support plate (7), and the upper end of the first connecting rope (16) is connected to the support frame (6) through a guide wheel.

5. The stator core dryer for new energy vehicles according to claim 1, characterized in that: A transmission gear (14) is installed through the interior of the rear side of the stainless steel housing (1), and rack assemblies (71) are meshed on both the upper and lower sides of the transmission gear (14), and the two rack assemblies (71) are respectively installed on the rear side of the two support plates (7) on the rear side.

6. The stator core dryer for new energy vehicles according to claim 1, characterized in that: The upper and lower rows of rear support plates (12) move towards each other.

7. The stator core dryer for new energy vehicles according to claim 1, characterized in that: A single-rotor reciprocating screw (10) is installed inside the left side of the stainless steel housing (1), and a fan blade assembly (101) is installed on the middle outer side of the single-rotor reciprocating screw (10), and an air inlet pipe (4) is correspondingly provided on the left side of the fan blade assembly (101).

8. The stator core dryer for new energy vehicles according to claim 7, characterized in that: The upper outer side of the single-rotor reciprocating screw (10) is threaded with a crossbar (11), and the left end of the crossbar (11) is engaged and slidably connected with a groove opened on the left inner wall of the stainless steel housing (1). A connecting sleeve (171) is rotatably installed through the outer side of the crossbar (11), and a fan plate (17) is fixed on the outer side of the connecting sleeve (171). A second connecting rope (173) is wound around the outer side of one end of the connecting sleeve (171), and the upper end of the second connecting rope (173) is connected to the housing on the bottom surface of the electric heating assembly (9). The other end of the connecting sleeve (171) is connected to a second spiral spring (172) nested on the outer side of the crossbar (11).

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