A zinc dipper

Abstract

The present application relates to a kind of zinc infiltration furnace, comprising: heating furnace, heating cavity is formed, for the component in heating cavity is heated;Zinc infiltration box, rotation is arranged in heating cavity, for accommodating workpiece, temperature sensing device and wireless signal transmitting device are arranged on the zinc infiltration box, temperature sensing device is electrically connected with wireless signal transmitting device, and wireless signal transmitting device is used to send temperature information detected by temperature sensing device by wireless transmission mode;Driving device, for driving zinc infiltration box rotation, and adjusting zinc infiltration box rotation speed;Control device, for responding to the signal of wireless signal transmitting device, control heating furnace heating temperature and control driving device operating state;The temperature of workpiece is monitored in real time by temperature sensing device and is responded to control by control device, can make workpiece always keep in specified temperature and work, the temperature control precision of workpiece is higher, can let subsequent zinc infiltration layer forming quality be better.

Description

Technical Field

[0001] This invention relates to the technical field of zinc diffusion equipment, and in particular to a zinc diffusion furnace. Background Technology

[0002] Currently, in metal processing, it is often necessary to perform surface coating treatment on finished metal workpieces to prevent various forms of corrosion and extend their service life. Powder zinc infiltration is one such metal surface coating process. It obtains a zinc-iron alloy layer on the surface of steel through thermal diffusion. Powder zinc infiltration has advantages such as high hardness, material saving, simple operation, and no hydrogen embrittlement.

[0003] Powder zinc diffusion involves placing the workpiece and zinc diffusion agent together in a rotating container. During heating, the container rotates, and the zinc diffusion agent continuously impacts the heated workpiece surface under the action of mechanical energy. The mechanical energy after the impact improves the zinc diffusion efficiency and accelerates the formation of the zinc layer. This is the mainstream powder zinc diffusion process today.

[0004] However, during the heating process, the workpiece heating temperature control accuracy is not high, resulting in a defect of poor zinc plating layer quality. Summary of the Invention

[0005] To address the problem of low accuracy in workpiece heating temperature control, this application provides a zinc diffusion furnace.

[0006] The above-mentioned objective of this invention is achieved through the following technical solution: a zinc diffusion furnace, comprising:

[0007] A heating furnace having a heating chamber for heating components within the chamber;

[0008] The zinc-diffusion box is rotatably mounted inside the heating chamber to accommodate the workpiece. The zinc-diffusion box is equipped with a temperature sensing device and a wireless signal transmitting device. The temperature sensing device and the wireless signal transmitting device are electrically connected. The wireless signal transmitting device is used to transmit the temperature information detected by the temperature sensing device wirelessly.

[0009] A drive unit is used to drive the zinc plating box to rotate and adjust the rotation speed of the zinc plating box.

[0010] The control device is used to respond to signals from the wireless signal transmitter to control the heating temperature of the furnace and the operating status of the drive device.

[0011] Preferably, the zinc plating box is provided with a rotating shaft, which is rotatably connected to the heating furnace. One end of the rotating shaft is connected to the zinc plating box, and the other end extends out of the heating furnace. The rotating shaft is hollow, and the temperature sensing device and the wireless signal transmitting device are located inside the rotating shaft.

[0012] Preferably, the rotating shaft includes,

[0013] A fixed shaft is connected to the zinc diffusion box body, with one end of the fixed shaft connected to the zinc diffusion box body and the other end located outside the heating furnace;

[0014] A connecting shaft is thermally insulated and connected to the end of the fixed shaft away from the zinc-distilled box body. Both the fixed shaft and the connecting shaft are hollow and coaxially connected.

[0015] Preferably, a temperature sensing surface is provided on the zinc-dipped box body located inside the fixed shaft, the temperature sensing device is attached to the temperature sensing surface, and a clamping member is provided inside the fixed shaft for pressing the temperature sensing device against the temperature sensing surface.

[0016] Preferably, the temperature sensing device includes,

[0017] A rigid shell used to provide support;

[0018] A movable plate is movably connected to a rigid shell. A first elastic element is connected between the movable plate and the rigid shell. The angle between the movable plate and the temperature sensing surface is an acute angle. The first elastic element is used to ensure that the angle between the movable plate and the temperature sensing surface always tends to remain an acute angle. When the movable plate is pressed towards the temperature sensing surface, the movable plate can rotate an angle and completely fit into the temperature sensing surface.

[0019] The sensing sensor is located on the side of the movable plate away from the rigid housing and is oriented toward the temperature sensing surface.

[0020] Preferably, the clamping element includes,

[0021] A push block is threaded into the rotating shaft, and rotating the push block allows it to move toward / away from the temperature sensing surface.

[0022] Abutting element, used to press the temperature sensing device against the temperature sensing surface;

[0023] The second elastic element is located between the push block and the abutment element.

[0024] Preferably, the wireless signal transmitting device includes,

[0025] The heat-insulating shell is hollow and has a heat-insulating function;

[0026] A wireless signal transmitting module, housed within a heat-insulating housing, is used for electrical connection with a temperature sensing device.

[0027] The heat dissipation coil has one end inside the heat insulation shell and the other end outside the heat insulation shell. The heat dissipation coil outside the heat insulation shell is equipped with several fins and is located on the side of the heat insulation shell away from the temperature sensing device.

[0028] Preferably, the wire connecting the wireless signal transmitting module and the temperature sensing device passes through the heat insulation housing, enters the housing, and is then wound around the heat dissipation coil.

[0029] Preferably, the wireless signal transmitting device is located inside the connecting shaft, and a sealing and heat-insulating component is provided between the wireless signal transmitting device and the temperature sensing device. The sealing and heat-insulating component is used to prevent external dust from entering the fixed shaft.

[0030] Preferably, the zinc-diffused box body is connected to an air extraction pipe, and the air extraction pipe includes an on / off valve.

[0031] In summary, the present invention has at least one of the following beneficial technical effects:

[0032] 1. The temperature of the zinc diffusion box is detected by a temperature sensing device. Since the workpiece is inside and in contact with the zinc diffusion box, its temperature will eventually match that of the box. Simply heating the zinc diffusion box and maintaining it at a certain temperature for a period of time will allow the workpiece to reach the same temperature. Therefore, the temperature of the zinc diffusion box can be detected. During detection, the temperature of the zinc diffusion box is sensed by the temperature sensing device, and then the temperature information is transmitted wirelessly to the control device. The control device adjusts the heating temperature of the furnace and the rotation speed of the drive device in a timely manner according to actual needs. Throughout the process, the temperature of the workpiece is monitored in real time by the temperature sensing device and controlled by the control device, ensuring that the workpiece is always kept within the specified temperature range. The high temperature control accuracy of the workpiece leads to better quality of the subsequent zinc diffusion layer formation.

[0033] 2. The wireless signal transmitter is insulated by a heat-insulating shell, which can prevent high temperatures from affecting the normal operation of the wireless signal transmitter and improve its service life. Attached Figure Description

[0034] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0035] Figure 2 This is a schematic diagram of the structure of the heating furnace when it is turned on according to an embodiment of this application.

[0036] Figure 3 This is a structural diagram of a zinc-plated box.

[0037] Figure 4 This is a sectional view of the rotating shaft.

[0038] In the diagram, 1 is the heating furnace; 11 is the heating chamber; 2 is the zinc-dipped box; 21 is the rotating shaft; 21a is the fixed shaft; 21b is the connecting shaft; 21c is the temperature sensing surface; 3 is the temperature sensing device; 31 is the rigid shell; 32 is the movable plate; 33 is the sensing sensor; 34 is the first elastic element; 4 is the wireless signal transmitting device; 41 is the heat insulation shell; 42 is the wireless signal transmitting module; 43 is the heat dissipation coil; 44 is the fins; 5 is the driving device; 6 is the heat insulation connection structure; 61 is the first flange; 62 is the second flange; 63 is the heat insulation plate; 7 is the clamping element; 71 is the push block; 72 is the abutment element; 73 is the second elastic element; 8 is the sealing heat insulation element; 9 is the exhaust pipe; and 91 is the opening and closing valve. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Reference Figure 1 , 2 This invention discloses a zinc diffusion furnace, comprising a heating furnace 1, a zinc diffusion box 2, a driving device 5, and a control device. The heating furnace 1 has a heating chamber 11, and the zinc diffusion box 2 is located inside the heating chamber 11. Rotating shafts 21 are provided at both ends of the zinc diffusion box 2, and the zinc diffusion box 2 is rotatably mounted on the heating furnace 1 through the rotating shafts 21. The driving device 5 is located outside the heating furnace 1 and fixed to the outer wall of the heating furnace 1, and is used to drive the rotating shafts 21 to rotate, thereby causing the zinc diffusion box 2 to rotate. The control device is located in the control room and controls the operation of the driving device 5 and the heating furnace 1 through wireless communication, thereby changing the temperature of the zinc diffusion box 2 and the rotation speed of the driving device 5.

[0041] Heating furnace 1 is a hollow cuboid shape. Heating furnace 1 has a heat insulation layer, which can keep the temperature of the outer wall of heating furnace 1 low when heating the zinc-diffused box 2, thereby reducing the safety risks during production. When heating the zinc-diffused box 2 in heating furnace 1, it can be heated by introducing hot air from the outside or by setting heating components in heating furnace 1. Its main purpose is to heat the zinc-diffused box 2.

[0042] In this embodiment, the driving device 5 consists of a motor and a reduction gearbox. The driving device 5 drives the rotating shaft 21 to rotate, which in turn drives the zinc diffusion box 2 to rotate. By controlling the rotation speed of the driving device 5, the rotation speed of the zinc diffusion box 2 can be controlled, thereby controlling the zinc diffusion box 2 to move at a specified speed at a specified temperature, thus improving the zinc diffusion effect. The control device is a PLC or similar device, used to receive temperature signals and then adjust whether the heating furnace 1 heats or maintains the temperature based on a comparison with the set value. It can also adjust the rotation speed of the driving device 5.

[0043] Reference Figure 2 , 3The zinc-diffusion box 2 is hollow inside and has an opening and closing cover. The zinc-diffusion box 2 can be opened by opening and closing the cover, and then the workpiece and powder can be put into the zinc-diffusion box 2. After closing the opening and closing cover, the zinc-diffusion box 2 is heated and rotated, thereby forming a zinc-diffusion layer on the surface of the workpiece. Holes for accommodating rotating shafts 21 are provided at both ends of the heating furnace 1, and the rotating shafts 21 are located in the holes. The zinc plating box 2 is connected to an exhaust pipe 9, which includes an on / off valve 91. In this embodiment, the exhaust pipe 9 is located on the opening and closing cover plate. The exhaust pipe 9 can draw the zinc plating box 2 to a negative pressure before heating it. When the zinc plating box 2 is heated, the air inside the zinc plating box 2 expands due to heat and the pressure will decrease relatively. Therefore, it is not easy for the air inside the zinc plating box 2 to leak from the opening and closing cover plate of the zinc plating box 2, and thus it will not carry the powder inside the zinc plating box 2 out. This avoids the situation where the powder inside the zinc plating box 2 leaks to the outside along with the air after it expands due to heat, thereby reducing the dust content in the workshop.

[0044] Reference Figure 3 , 4 The rotating shaft 21 includes a fixed shaft 21a and a connecting shaft 21b. The fixed shaft 21a is welded to both ends of the heating furnace 1. The connecting shaft 21b is connected to the fixed shaft 21a away from the zinc-diffusion box 2 via a heat-insulating connection structure 6. The heat-insulating connection structure 6 can effectively prevent the heat on the zinc-diffusion box 2 from being directly transferred to the connecting shaft 21b. One end of the fixed shaft 21a is welded to the zinc-diffusion box 2, while the other end extends out of the heating furnace 1. Both the fixed shaft 21a and the connecting shaft 21b are hollow and coaxially connected. A temperature sensing device 3 is installed inside the fixed shaft 21a, while a wireless signal transmitter 4 is installed inside the connecting shaft 21b. The temperature sensing device 3 and the wireless signal transmitter 4 are connected together by a wire. When the temperature sensing device 3 detects the temperature of the zinc-diffusion box 2, it transmits the detected information to the wireless signal transmitter 4 via the wire. After receiving the temperature signal, the wireless signal transmitter 4 transmits the signal wirelessly, which is then received by the control device.

[0045] Setting the temperature sensing device 3 and the wireless signal transmitter 4 inside the rotating shaft 21 can reduce the ambient temperature of both during operation to a certain extent, greatly improving their service life. Setting the temperature sensing device 3 inside the fixed shaft 21a and the wireless signal transmitter 4 inside the connecting shaft 21b can greatly reduce the ambient temperature of the wireless signal transmitter 4 during operation, improving the working stability of the wireless signal transmitter 4. Setting the temperature sensing device 3 inside the fixed shaft 21a makes it convenient for the temperature sensing device 3 to collect the temperature on the zinc-distillation box 2.

[0046] Reference Figure 3 , 4The heat-insulating connection structure 6 includes a first flange 61 located on the fixed shaft 21a and a second flange 62 located on the connecting shaft 21b. The first flange 61 is integrally formed with the fixed shaft 21a and located on the side of the fixed shaft 21a away from the zinc-distilled box 2. The second flange 62 is integrally formed with the connecting shaft 21b and located on the side of the connecting shaft 21b facing the fixed shaft 21a. The fixed shaft 21a and the connecting shaft 21b are connected together by bolts or the like. When connecting the first flange 61 and the second flange 62, a heat insulation plate 63 is held between them to reduce the heat transfer efficiency between the fixed shaft 21a and the connecting shaft 21b. During installation, the heat insulation plate 63 is placed between the first flange 61 and the second flange 62, and then the first flange 61 and the second flange 62 are tightened by bolts or the like to complete the connection. In this embodiment, the insulation board 63 is an extruded polystyrene board, which has the advantages of being moisture-resistant, pressure-resistant, corrosion-resistant, lightweight, low water absorption, and low thermal conductivity. It can both seal the space between the first flange 61 and the second flange 62 and provide thermal insulation.

[0047] Reference Figure 3 , 4 To prevent external dust from entering the fixed shaft 21a, a sealing and heat-insulating component 8 is provided at the end of the connecting shaft 21b facing the fixed shaft 21a. The sealing and heat-insulating component 8 is interference-fitted into the connecting shaft 21b, preventing hot air from the fixed shaft 21a side from entering the connecting shaft 21b, and preventing external dust from entering the fixed shaft 21a from the connecting shaft 21b. This ensures that the fixed shaft 21a remains clean during the installation and replacement of the temperature sensing device 3, preventing foreign objects between the temperature sensing device 3 and the zinc-distilled housing 2 from affecting the detection accuracy of the temperature sensing device 3. In this embodiment, the sealing and heat-insulating component 8 is made of heat-resistant rubber. The heat-resistant rubber is elastic, which facilitates the interference fit of the heat-insulating component. At the same time, if the equipment malfunctions and the temperature of the connecting shaft 21b rises, the heat-resistant rubber will emit an odor after being heated, which can help remind workers to pay attention to safety and maintain the equipment in a timely manner.

[0048] A temperature sensing surface 21c is provided on the zinc-diffused box 2 inside the fixed shaft 21a. The temperature sensing device 3 is used to fit against the temperature sensing surface 21c. In this embodiment, the temperature sensing surface 21c is a circular groove formed on the zinc-diffused box 2. The circular groove has a certain smoothness to facilitate the contact of the temperature sensing device 3 with it to collect temperature. The temperature sensing device 3 includes a rigid housing 31, a movable plate 32, and a sensing sensor 33. The rigid housing 31 is used to provide support and protection. In this embodiment, the rigid housing 31 is cylindrical and coated with a heat-insulating coating to improve the heat resistance of the rigid housing 31. The rigid housing 31 is clearance-fitted with the inner hole of the fixed shaft 21a. In use, the rigid housing 31 is simply placed into the fixed shaft 21a. The movable plate 32 is hinged to one end of the rigid housing 31. During installation, the rigid housing 31 connected to the movable plate 32 is placed into the fixed shaft 21a with the first side facing inward.

[0049] Reference Figure 3 , 4 The sensing sensor 33 is fixed on the movable plate 32 facing the temperature sensing surface 21c. Meanwhile, to make the movable plate 32 form an acute angle with the vertical plane (the plane where the temperature sensing surface 21c is located), the movable plate 32 is positioned away from the hinge axis on the side... Figure 4 A first elastic element 34 is provided below the movable plate (in this embodiment, the first elastic element 34 is a heat-resistant spring). One end of the first elastic element 34 is connected to the movable plate 32, and the other end is connected to the rigid housing 31. When installing the temperature sensing device 3, adhesive is applied to the sensing sensor 33, and then the end of the sensing sensor 33 facing the fixed shaft 21a is inserted. After insertion, the hinge shaft side of the movable plate 32 is positioned above, and the first elastic element 34 side is positioned below. As the temperature sensing device 3 is continuously inserted, the lower end of the movable plate 32 will contact the temperature sensing surface 21c, until the upper end of the movable plate 32 also contacts the temperature sensing surface 21c. At this time, the sensing sensor 33 will adhere to the fixed shaft 21a. On the temperature sensing surface 21c; as the movable plate 32 contacts the temperature sensing surface 21c from the bottom to the top, a portion of the adhesive on the sensor 33 is squeezed out. During this squeezing process, the adhesive and air between the sensing surface and the sensor 33 are squeezed out from the upper position of the movable plate 32. Simultaneously, while waiting for the adhesive to dry and bond, the adhesive squeezed out from the upper position of the movable plate 32 can flow into the gap between the sensor 33 and the temperature sensing surface 21c to fill any gaps, thus improving the adhesion between the sensor 33 and the temperature sensing surface 21c and increasing the accuracy of subsequent temperature detection. The first elastic element 34 allows the sensor 33 to adhere to the temperature sensing surface 21c from the bottom first, gradually expanding to the top, which facilitates the subsequent removal of air and adhesive. Figure 4The image shows the structure before the temperature sensor is fully installed.

[0050] Reference Figure 3 , 4 In order to press the temperature sensing device 3 onto the temperature sensing surface 21c, a clamping member 7 is provided inside the fixed shaft 21a. The clamping member 7 includes a push block 71, an abutment member 72, and a second elastic member 73 located between the push block 71 and the abutment member 72. In this embodiment, the second elastic member 73 is a spring. One end of the second elastic member 73 is connected to the abutment member 72, and the other end abuts against the push block 71. The push block 71 is threadedly connected to the inner wall of the fixed shaft 21a, while the abutment member 72 is clearance-fitted to the fixed shaft 21a. During installation, the temperature sensing device 3 is first placed into the fixed shaft 21a, and then the abutment member 72 is pressed into the fixed shaft 21a. The receiving part 72 and the second elastic element 73 are placed inside the fixed shaft 21a. Then, the push block 71 is screwed into the fixed shaft 21a. As the push block 71 is gradually screwed into the fixed shaft 21a, it will push the second elastic element 73 to move into the fixed shaft 21a until the second elastic element 73 is compressed and the temperature sensing device 3 is pressed into the specified position. The second elastic element 73 can ensure that the temperature sensing device 3 is always subjected to a certain pushing force, ensuring that the temperature sensing device 3 and the temperature sensing surface 21c are in firm contact, and also preventing the push block 71 from directly contacting the receiving part 72, thus reducing the heat transfer rate between the two.

[0051] In this embodiment, both the pusher 71 and the abutment 72 are made of heat-resistant and heat-insulating materials, specifically metal materials coated with a heat-insulating coating.

[0052] The wireless signal transmitting device 4 includes a heat-insulating shell 41, a wireless signal transmitting module 42, and a heat dissipation coil 43. The heat-insulating shell 41 is a hollow shell made of heat-insulating material. The wireless signal transmitting module 42 is placed inside the heat-insulating shell 41. The wireless signal transmitting module 42 has its own battery or a rechargeable battery. One end of the heat dissipation coil 43 is located inside the heat-insulating shell 41, and the other end is located outside the heat-insulating shell 41. The part of the heat dissipation coil 43 located inside the heat-insulating shell 41 is coiled inside the heat-insulating shell 41, while the wireless signal transmitting module 42 is located in the space enclosed by the heat dissipation coil 43, which can absorb and carry away the heat of the wireless signal transmitting module 42. Fins 44 are welded on the heat dissipation coil 43 located outside the heat-insulating shell 41. In order to improve the heat dissipation effect, the part of the heat dissipation coil 43 located outside the heat-insulating shell 41 is located on the right side of the heat-insulating shell 41. The fins 44 extend outside the connecting shaft 21b. Through the flow of outside air, the heat on the fins 44 can be carried away at the maximum rate, so that the temperature inside the heat-insulating shell 41 is always within the specified range.

[0053] Reference Figure 3 , 4Since the heat insulation shell 41 can isolate external heat, the heat generated by the heating furnace 1 is not likely to affect the wireless signal transmitting module 42 inside the heat insulation shell 41. The wireless signal transmitting module 42 will generate some heat during operation. Due to the presence of the heat insulation shell 41, the heat cannot be dissipated in time. As the working time increases, the temperature inside the heat insulation shell 41 will rise above the specified temperature, affecting the normal operation of the wireless signal transmitting module 42. However, the heat dissipation coil 43 can carry away the heat inside the heat insulation shell 41, ensuring that the temperature inside the heat insulation shell 41 is suitable.

[0054] In this embodiment, wire holes are provided on the push block 71, the abutment 72, and the sealing and heat insulation component 8. The wires are sealed and connected to the push block 71, the abutment 72, and the sealing and heat insulation component 8. The wires pass through the push block 71, the abutment 72, and the sealing and heat insulation component 8 in sequence, then enter the heat insulation housing 41 and are wound around the heat dissipation coil 43 before being connected to the wireless signal transmission module 42. This allows the heat on the wires to be carried away by the heat dissipation coil 43, preventing the wires from directly transferring heat to the wireless signal transmission module 42.

[0055] In use, the zinc plating box 2 is opened, and the powder and workpiece are added into the zinc plating box 2 together. Then the zinc plating box 2 is closed, and some of the air inside the zinc plating box 2 is extracted by the air extraction device. Then the zinc plating box 2 is heated. The temperature of the zinc plating box 2 is detected in real time by the temperature sensing device 3, and the temperature information is transmitted to the control device by the wireless signal transmitting device 4. After receiving the temperature information, the control device responds and controls the heating state of the heating furnace 1 and the driving state of the driving device 5, thereby controlling and adjusting the temperature and rotation speed of the zinc plating box 2.

[0056] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A zinc-diffusion furnace, characterized in that: include, A heating furnace (1) has a heating chamber (11) for heating components inside the heating chamber (11); The zinc-diffusion box (2) is rotatably set inside the heating chamber (11) to accommodate the workpiece. The zinc-diffusion box (2) is equipped with a temperature sensing device (3) and a wireless signal transmitting device (4). The temperature sensing device (3) is electrically connected to the wireless signal transmitting device (4). The wireless signal transmitting device (4) is used to transmit the temperature information detected by the temperature sensing device (3) through wireless transmission. The driving device (5) is used to drive the zinc plating box (2) to rotate and adjust the rotation speed of the zinc plating box (2); The control device is used to respond to the signal of the wireless signal transmitter (4) to control the heating temperature of the heating furnace (1) and control the working status of the drive device (5); The zinc plating box (2) is provided with a rotating shaft (21), which is rotatably connected to the heating furnace (1). One end of the rotating shaft (21) is connected to the zinc plating box (2), and the other end extends out of the heating furnace (1). The rotating shaft (21) is hollow, and the temperature sensing device (3) and the wireless signal transmitting device (4) are located inside the rotating shaft (21). The rotating shaft (21) includes, A fixed shaft (21a) is connected to the zinc-diffusion box (2), with one end of the fixed shaft (21a) connected to the zinc-diffusion box (2) and the other end located outside the heating furnace (1); The connecting shaft (21b) is thermally insulated and connected to the end of the fixed shaft (21a) away from the zinc-distilled box body (2). Both the fixed shaft (21a) and the connecting shaft (21b) are hollow and coaxially connected. A temperature sensing surface (21c) is provided on the zinc-diffused box body (2) located inside the fixed shaft (21a), and the temperature sensing device (3) is attached to the temperature sensing surface (21c). A clamping member (7) for pressing the temperature sensing device (3) onto the temperature sensing surface (21c) is provided inside the fixed shaft (21a). The temperature sensing device (3) includes, A rigid shell (31) is used to provide support; A movable plate (32) is movably connected to a rigid shell (31). A first elastic element (34) is connected between the movable plate (32) and the rigid shell (31). The angle between the movable plate (32) and the temperature sensing surface (21c) is an acute angle. The first elastic element (34) is used to ensure that the angle between the movable plate (32) and the temperature sensing surface (21c) always tends to remain an acute angle. When the movable plate (32) is pressed towards the temperature sensing surface (21c), the movable plate (32) can rotate an angle and completely fit into the temperature sensing surface (21c). A sensing sensor (33) is located on the side of the movable plate (32) away from the rigid housing (31) and is directed toward the temperature sensing surface (21c); The wireless signal transmitting device (4) includes, The heat-insulating shell (41) is hollow and has a heat-insulating function; A wireless signal transmitting module (42) is installed inside a heat-insulating housing (41) and is used to electrically connect to a temperature sensing device (3); The heat dissipation coil (43) has one end inside the heat insulation shell (41) and the other end outside the heat insulation shell (41). The heat dissipation coil (43) outside the heat insulation shell (41) is provided with several fins (44). The heat dissipation coil (43) outside the heat insulation shell (41) is located on the side of the heat insulation shell (41) away from the temperature sensing device (3).

2. A zinc-diffusion furnace according to claim 1, characterized in that: The clamping element (7) includes, The push block (71) is threadedly connected to the rotating shaft (21). When the push block (71) is rotated, it can move towards / away from the temperature sensing surface (21c). The abutment (72) is used to press the temperature sensing device (3) against the temperature sensing surface (21c); The second elastic element (73) is located between the push block (71) and the abutment element (72).

3. A zinc-diffusion furnace according to claim 1, characterized in that: The wire connecting the wireless signal transmitting module (42) and the temperature sensing device (3) passes through the heat insulation housing (41), enters the housing, and is then wrapped around the heat dissipation coil (43).

4. A zinc-diffusion furnace according to claim 1, characterized in that: The wireless signal transmitter (4) is located inside the connecting shaft (21b). A sealing and heat insulation component (8) is provided between the wireless signal transmitter (4) and the temperature sensing device (3). The sealing and heat insulation component (8) is used to prevent external dust from entering the fixed shaft (21a).

5. A zinc-diffusion furnace according to claim 1, characterized in that: The zinc-distilled box body (2) is connected to an air extraction pipe (9), which includes an on / off valve (91).

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