Mechanical surface hardness treatment device for metallic materials

Abstract

The application belongs to the technical field of metal processing, and discloses a mechanical metal material surface hardness heat treatment equipment, which comprises a shell, the outer wall of the shell is hinged with a door plate, further comprises: a cooling mechanism arranged on the outer wall of the shell; a flame spray head arranged in the inner wall of the shell through a connecting mechanism; wherein the cooling mechanism comprises a water tank, the inner wall of the water tank is elastically connected with a pressing plate through a return spring, the bottom end outer wall of the pressing plate is elastically connected with a moving plate through a connecting spring, the inner wall of the water tank is rotationally connected with a rotating wheel, and the outer wall of the rotating wheel is provided with a steel rope; through the cooperation of the pressing plate and the rotating block and other structures, the water in the water tank can be squeezed and sprayed out from the water spray pipe during the opening of the door plate, the hot gas escaping when the door plate is opened is cooled, and the problem of high temperature causing burns and other hazards to nearby operators can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of metal processing technology, specifically a mechanical metal material surface hardness heat treatment device. Background Technology

[0002] Mechanical metal material surface hardness heat treatment equipment is a type of specialized equipment that locally heats the surface layer of metal workpieces to improve the surface hardness and fatigue strength of the workpiece while maintaining good toughness in the core, meeting the surface strengthening needs of various mechanical metal parts such as gears, shafts, and molds.

[0003] A search revealed that CN216274241U discloses a metal surface hardness modification heat treatment device in the field of metal processing technology. The device includes a metal heat treatment machine with a door on the front end. A limiting mechanism is provided on one side of the door, and a rotating mechanism is provided on the other side of the door. The entire process of opening and closing the door does not require direct contact with the door, which can effectively prevent the door from causing burns to the workers. It has good protection and greatly improves the user's operating efficiency, making it quite practical.

[0004] Although the above-mentioned device can be opened without the operator directly touching the door, in actual use, the high temperature during the heat treatment process will cause the internal temperature of the shell to be high. When the door is opened, the high temperature will escape from the gap in the door. Although the operator does not need to touch the door, the operator nearby may still be injured by high temperature burns, which is a high risk of use. Therefore, a mechanical metal material surface hardness heat treatment device is proposed to address the above problems. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a heat treatment device for surface hardness of mechanical metal materials.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a heat treatment device for surface hardness of mechanical metal materials, comprising a housing, wherein a door panel is hinged to the outer wall of the housing, and further comprising: a cooling mechanism disposed on the outer wall of the housing; and a flame nozzle disposed in the inner wall of the housing via a connecting mechanism; The cooling mechanism includes a water tank, an inner wall of which is elastically connected to a pressure plate via a return spring, a bottom outer wall of which is elastically connected to a movable plate via a connecting spring, an inner wall of which is rotatably connected to a wheel, an outer wall of which is wound with a steel rope, an outer wall of which is fixedly connected to a connecting rod, an outer wall of which is fixedly connected to a fixing block, an inner wall of which is rotatably connected to a rotating block, and an outer wall of which is fixedly connected to a water spray pipe.

[0007] Preferably, the water tank is fixedly connected to the outer wall of the shell, and the inner wall of the spray pipe is provided with a valve.

[0008] Preferably, one end of the return spring is fixedly connected to the outer wall of the pressure plate, the other end of the return spring is fixedly connected to the inner wall of the water tank, and the pressure plate is slidably connected to the inner wall of the water tank.

[0009] Preferably, one end of the connecting spring is fixedly connected to the outer wall of the movable plate, the other end of the connecting spring is fixedly connected to the outer wall of the pressure plate, and the movable plate is slidably connected to the inner wall of the water tank.

[0010] Preferably, the two ends of the steel rope are fixedly connected to the outer walls of the rotating block and the moving plate, respectively. The steel rope is wound around the outer wall of the rotating block. The connecting rod is fixedly connected to the outer wall of the rotating block and rotatably connected to the inner wall of the fixed block.

[0011] Preferably, the connecting mechanism includes a connecting block, the outer wall of which has a through groove, the inner wall of which is rotatably connected to a rotating rod, the outer wall of which is fixedly connected to a gear A, the inner wall of which is rotatably connected to a gear B, the outer wall of which is fixedly connected to a rotating ring, the outer wall of which is hinged to a slider via a hinge rod, the inner wall of which is elastically connected to a trapezoidal block via a telescopic spring, the outer wall of which is fixedly connected to a pressure rod, the inner wall of which is slidably connected to a protrusion, the outer wall of which is fixedly connected to a sliding rod, the outer wall of which is fixedly connected to a fixing ring, and the inner wall of which is provided with a groove.

[0012] Preferably, the connecting block is fixedly connected to the inner wall of the housing, gear A meshes with gear B, and the rotating ring is rotatably connected to the inner wall of the connecting block.

[0013] Preferably, the two ends of the hinge rod are hinged to the outer walls of the slider and the rotating ring, respectively; the slider is slidably connected to the inner wall of the connecting block; and the trapezoidal block is slidably connected to the inner wall of the rotating rod.

[0014] Preferably, one end of the telescopic spring is fixedly connected to the outer wall of the trapezoidal block, the other end of the telescopic spring is fixedly connected to the inner wall of the rotating rod, and the sliding rod is slidably connected to the outer wall of the trapezoidal block.

[0015] Preferably, the protrusion engages with the groove, and the rotating rod is rotatably connected to the inner wall of the fixing ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the cooperation of structures such as pressure plates and rotating blocks, allows the door panel to drive the connecting rod and rotating block to rotate during the opening process. The rotating block pulls the steel rope to be wound onto the surface of the rotating block, and the other end of the steel rope pulls the moving plate and pressure plate to move down. The pressure plate can squeeze and spray water from the water tank from the spray pipe to cool the hot air that escapes when the door panel is opened, thus avoiding the problem of excessive temperature causing burns or other hazards to nearby operators. This invention, through the cooperation of connecting blocks and sliders, allows the slider to move outward or inward through the rotation of gears A, B, and the rotating ring when the pressure rod is pressed and the rotating rod is rotated. Adjusting the position of the slider ensures that its threaded hole corresponds to the threaded hole of different specifications of flame nozzles, thereby improving the adaptability of the connection and avoiding the problem of installation failure due to mismatched threaded holes after changing the specifications of the flame nozzle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cooling mechanism of the present invention; Figure 3 This is a cross-sectional view of the water tank, the fixing block, and a schematic diagram of the water spray pipe structure of the present invention; Figure 4 This is a schematic cross-sectional view of the water tank and fixing block of the present invention; Figure 5 This is an exploded structural diagram of the flame nozzle and connecting mechanism of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the connecting block of the present invention; Figure 7 This is a structural schematic diagram of the fixed ring and rotating rod after cross-sectional disassembly.

[0018] In the picture: 100. Shell; 200. Cooling mechanism; 201. Water tank; 202. Return spring; 203. Pressure plate; 204. Connecting spring; 205. Moving plate; 206. Rotating wheel; 207. Steel rope; 208. Rotating block; 209. Connecting rod; 210. Fixing block; 211. Water spray pipe; 212. Valve; 300. Connecting mechanism; 301. Connecting block; 302. Through groove; 303. Rotating rod; 304. Gear A; 305. Gear B; 306. Rotating ring; 307. Hinge rod; 308. Slider; 309. Telescopic spring; 310. Trapezoidal block; 311. Pressure rod; 312. Protrusion; 313. Slide rod; 314. Fixing ring; 315. Groove; 400, door panel; 500, flame nozzle. 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] like Figures 1 to 7 As shown, the present invention provides a heat treatment device for surface hardness of mechanical metal materials, including a housing 100, a door panel 400 hinged to the outer wall of the housing 100, and further including: a cooling mechanism 200 disposed on the outer wall of the housing 100; and a flame nozzle 500 disposed in the inner wall of the housing 100 through a connecting mechanism 300. The cooling mechanism 200 includes a water tank 201. The inner wall of the water tank 201 is elastically connected to a pressure plate 203 via a return spring 202. The outer wall of the bottom end of the pressure plate 203 is elastically connected to a moving plate 205 via a connecting spring 204. The inner wall of the water tank 201 is rotatably connected to a rotating wheel 206. A steel rope 207 is wound around the outer wall of the rotating wheel 206. The outer wall of the door panel 400 is fixedly connected to a connecting rod 209. The outer wall of the housing 100 is fixedly connected to a fixing block 210. The inner wall of the fixing block 210 is rotatably connected to a rotating block 208. The outer wall of the water tank 201 is fixedly connected to a water spray pipe 211.

[0021] like Figures 2 to 4 As shown, the water tank 201 is fixedly connected to the outer wall of the shell 100, and the inner wall of the spray pipe 211 is provided with a valve 212.

[0022] The above solution employs the following method: The housing 100 is the main body of the equipment shell used for heat treatment of the surface of mechanical metal materials, which is existing technology. The material can be placed inside the housing 100, the door 400 is closed, and the surface is heated by a flame nozzle 500 to increase its hardness. After heating, the door 400 can be opened to remove the material. Because the internal temperature of the housing 100 is relatively high, a large amount of hot air will escape from the housing 100 when the door 400 is opened. A cooling mechanism 200 automatically sprays water downwards during the opening of the door 400, thereby reducing the temperature of the hot air and achieving a good cooling effect. To avoid the risk of burns to nearby operators; the connection between the door panel 400 and the housing 100 is existing technology, which can be automatically opened and closed by electronic control, and can be held in a certain position after opening. The opening process of the door panel 400 can drive the cooling mechanism 200 to spray water. The side wall of the water tank 201 is provided with a water inlet, and there is a one-way valve inside, which can only allow water to enter but not exit. The water tank 201 is connected to the inner wall of the spray pipe 211, and water can be sprayed out from the nozzle of the spray pipe 211. The valve 212 in the spray pipe 211 can prevent the water in the water tank 201 from being sprayed out from the spray pipe 211 when there is no pressure.

[0023] like Figures 2 to 4 As shown, one end of the return spring 202 is fixedly connected to the outer wall of the pressure plate 203, and the other end of the return spring 202 is fixedly connected to the inner wall of the water tank 201. The pressure plate 203 is slidably connected to the inner wall of the water tank 201. One end of the connecting spring 204 is fixedly connected to the outer wall of the moving plate 205, and the other end of the connecting spring 204 is fixedly connected to the outer wall of the pressure plate 203. The moving plate 205 is slidably connected to the inner wall of the water tank 201. Both ends of the steel rope 207 are fixedly connected to the outer walls of the rotating block 208 and the moving plate 205, respectively. The steel rope 207 is wound around the outer wall of the rotating block 208. The connecting rod 209 is fixedly connected to the outer wall of the rotating block 208 and rotatably connected to the inner wall of the fixed block 210.

[0024] Using the above scheme: Under normal conditions, when the door panel 400 is closed, the return spring 202 pulls the pressure plate 203 above the inner wall of the water tank 201 due to its elastic force. The pressure plate 203, through the connecting spring 204, pulls the moving plate 205 to a relatively high position. The water in the water tank 201 is located in the space between the pressure plate 203 and the water tank 201, with the highest liquid level slightly lower than the bottom outer wall of the pressure plate 203. At this time, the water is not under pressure, and the valve 212 blocks it so that it does not flow out of the spray pipe 211. Moreover, the elastic force of the return spring 202 is less than the elastic force of the connecting spring 204. The pressure plate 203 drives the steel rope 207 to a certain position. The steel rope 207 passes through the fixing block 210 and the outer wall of the water tank 201. The rotation center of the door panel 400 when opening and closing corresponds to the center of the connecting rod 209. During the opening process of door panel 400, the connecting rod 209 rotates synchronously, which in turn drives the rotating block 208 to rotate synchronously. The rotating block 208 pulls one end of the steel rope 207 to move, winding the steel rope 207 onto its surface. The steel rope 207 moves towards the rotating block 208 and passes through the rotating wheel 206. The rotating wheel 206 rotates to reduce friction and changes the direction of the tension of the steel rope 207, causing it to pull the moving plate 205 downward first. The moving plate 205 pulls the pressure plate 203 downward synchronously through the connecting spring 204. The pressure plate 203 can then squeeze the water in the water tank 201. After being pressed, the water will push open the valve 212 and enter the spray pipe 211. Under pressure, it will spray downward from the nozzle, thus cooling the hot air by spraying water while opening door panel 400 to prevent scalding.

[0025] Furthermore, during the downward movement of the movable plate 205, because the pressure plate 203 constantly exerts pressure on the water, the moving speed of the pressure plate 203 will be less than the moving speed of the movable plate 205. After the door panel 400 is fully opened, the movable plate 205 can no longer move downward, and the rotating block 208 and the steel rope 207 are both in a certain position, fixing the position of the movable plate 205. At this time, the connecting spring 204 is in its maximum tension state, and will pull the pressure plate 203 downward continuously through elastic force, and the pressure plate 203 will stretch the return spring 202; when the door panel 400 is fully opened, the movable plate 205 can no longer move downward. When closed, the connecting rod 209 and the rotating block 208 rotate in opposite directions, causing the steel rope 207 to become loose. At this time, the moving plate 205 loses the tension of the steel rope 207 and will move upward to reset under the action of the connecting spring 204. The connecting spring 204, together with the reset spring 202, can also drive the pressure plate 203 to move upward and reset synchronously, so that the cooling mechanism 200 returns to the initial state. After the door panel 400 is closed, the material heat treatment operation can continue, and water can be added to the inside of the water tank 201 through the water inlet pipe to prepare for the next cooling.

[0026] like Figures 5 to 7 As shown, the connecting mechanism 300 includes a connecting block 301. A through groove 302 is provided on the outer wall of the connecting block 301. A rotating rod 303 is rotatably connected to the inner wall of the connecting block 301. A gear A 304 is fixedly connected to the outer wall of the rotating rod 303. A gear B 305 is rotatably connected to the inner wall of the connecting block 301. A rotating ring 306 is fixedly connected to the outer wall of the gear B 305. A slider 308 is hinged to the outer wall of the rotating ring 306 via a hinge rod 307. A trapezoidal block 310 is elastically connected to the inner wall of the rotating rod 303 via a telescopic spring 309. A pressure rod 311 is fixedly connected to the outer wall of the trapezoidal block 310. A protrusion 312 is slidably connected to the inner wall of the rotating rod 303. A sliding rod 313 is fixedly connected to the outer wall of the protrusion 312. A fixing ring 314 is fixedly connected to the outer wall of the connecting block 301. A groove 315 is provided on the inner wall of the fixing ring 314.

[0027] Using the above solution: The flame nozzle 500 comes in various specifications. To meet different heating requirements, it may be necessary to replace the flame nozzle 500. The flame nozzle 500 is fixed to the connecting mechanism 300 by bolts and nuts. The threaded holes on the outer wall of the flame nozzle 500 can be bolted to correspond to the threaded holes on the outer wall of the slider 308. Different specifications of flame nozzles 500 may have different threaded hole positions. In this case, the position of the slider 308 can be adjusted through the connecting mechanism 300 to align the threaded holes on the slider 308 with the threaded holes on the flame nozzle 500, thus enabling adaptive installation and improving the connection adaptability to various different flame nozzles 500.

[0028] like Figures 5 to 7As shown, the connecting block 301 is fixedly connected to the inner wall of the housing 100, gear A304 meshes with gear B305, and the rotating ring 306 is rotatably connected to the inner wall of the connecting block 301; the two ends of the hinge rod 307 are respectively hinged to the outer walls of the slider 308 and the rotating ring 306, the slider 308 is slidably connected to the inner wall of the connecting block 301, and the trapezoidal block 310 is slidably connected to the inner wall of the rotating rod 303; one end of the telescopic spring 309 is fixedly connected to the outer wall of the trapezoidal block 310, and the other end of the telescopic spring 309 is fixedly connected to the inner wall of the rotating rod 303, and the sliding rod 313 is slidably connected to the outer wall of the trapezoidal block 310; the protrusion 312 is engaged with the groove 315, and the rotating rod 303 is rotatably connected to the inner wall of the fixed ring 314.

[0029] Using the above scheme: the outer wall of the flame nozzle 500 can be connected to the outer wall of the connecting block 301 by fitting together. The rotating rod 303 passes through one side of the outer wall of the connecting block 301. Under normal conditions, the rotating rod 303 and the fixing ring 314 are fixed by the engagement of the protrusion 312 and the groove 315, preventing the rotating rod 303 from rotating. After the limiting position of the rotating rod 303 is released, when the protrusion 312 disengages from the groove 315, the rotating rod 303 can be manually rotated. When rotating, the gear A304 rotates synchronously, driving the gear meshing with it. Gear B305 rotates synchronously, and rotating ring 306 rotates accordingly, which drives one end of hinge rod 307 connected to it to rotate around the circumference, and the other end drives slider 308 to move. Since slider 308 is slidably connected to the inner wall of connecting block 301, it can only move vertically or horizontally, thereby driving four sets of sliders 308 to move simultaneously around the circumference or the center. The outer wall of slider 308 is provided with threaded holes, and the threaded holes can always correspond to through grooves 302 when it moves, and bolts can be inserted into the threaded holes and through grooves 302.

[0030] Furthermore, the pressure rod 311 penetrates one side of the outer wall of the rotating rod 303. Before rotating the rod 303, the operator can press the pressure rod 311, causing the trapezoidal block 310 to move inward synchronously. Under normal conditions, the long side inclined surface of the trapezoidal block 310 contacts the sliding rod 313, pushing it and the protrusion 312 outward. After the trapezoidal block 310 moves inward, the inclined surface will drive the sliding rod 313 to move. Since both the sliding rod 313 and the protrusion 312 can only move laterally, the sliding rod 313 moves along the inclined surface of the trapezoidal block 310 to the short side, and pulls the protrusion 312 into the inner wall of the rotating rod 303, thus disengaging from the groove 315 and releasing the limiting position of the rotating rod 303 so that it can rotate. The fixing ring 314 has multiple sets of grooves 315, which can be used to rotate the rod. 303 is rotated to multiple positions for fixation; during the rotation of the rotating rod 303, the slider 308 moves to a suitable position. When the slider 308 corresponds to the threaded hole on the outer wall of the flame nozzle 500, the pressure rod 311 can be released. The trapezoidal block 310 is reset by the extension spring 309, and the inclined surface pushes the slide rod 313 and the protrusion 312 outward. The protrusion 312 engages with the corresponding groove 315 to complete the fixation of the rotating rod 303, thereby fixing the position of the slider 308. At this time, the bolt can be rotated through the slider 308, the through groove 302 and the threaded hole on the outer wall of the flame nozzle 500 for connection and fixation. This avoids the problem of installation and connection failure due to the mismatch of threaded holes caused by changes in the specifications of the flame nozzle 500, and has higher adaptability.

[0031] Working principle and usage process of this invention: Before heat treating the metal material, the operator selects the appropriate flame nozzle 500 according to the heating requirements of the workpiece. If the nozzle specification changes, causing the flame nozzle 500 to mismatch with the threaded hole of the slider 308, the operator can press the pressure rod 311 to move the trapezoidal block 310 inward and extend the spring 309. The inclined surface of the trapezoidal block 310 drives the slide rod 313 and the protrusion 312 to retract towards the inner wall of the rotating rod 303, causing the protrusion 312 to disengage from the groove 315 of the fixing ring 314, thus releasing the limit of the rotating rod 303. Then, the operator can manually rotate the rotating rod 303, which, through the meshing transmission of gear A304 and gear B305, drives the rotating ring 306 to rotate. The rotating ring 306 passes through... The hinge rod 307 drives the slider 308 to slide on the inner wall of the connecting block 301 until the threaded hole on the outer wall of the slider 308 is aligned with the threaded hole of the flame nozzle 500 to be installed. After completion, the pressure rod 311 can be released, the telescopic spring 309 pushes the trapezoidal block 310 to reset, and the inclined surface of the trapezoidal block 310 pushes the slider 313 and the protrusion 312 outward, so that the protrusion 312 engages with the groove 315 at the corresponding position of the fixing ring 314, fixing the position of the rotating rod 303 and the slider 308. At this time, the flame nozzle 500 can be attached to the outer wall of the connecting block 301. The bolts are passed through the threaded hole of the slider 308, the through groove 302 and the threaded hole of the flame nozzle 500 in sequence, and the nut is used to complete the fixed installation of the flame nozzle 500.

[0032] After the flame nozzle 500 is installed, the mechanical metal material to be heat-treated can be placed inside the housing 100, and then the door panel 400 is closed. The cooling mechanism 200 is in its initial state. Water is injected into the water tank 201 through external equipment, and at the same time the flame nozzle 500 is started. The flame is precisely applied to the surface of the metal workpiece for high-temperature heating and hardening treatment.

[0033] After heating is complete, the control door panel 400 opens. The door panel 400 rotates around the hinge axis, causing the connecting rod 209 and the rotating block 208 to rotate on the inner wall of the fixed block 210. The rotating block 208 winds up the steel rope 207. The steel rope 207 changes the direction of tension through the rotating wheel 206, pulling the moving plate 205 downward along the inner wall of the water tank 201. The moving plate 205 pulls the pressure plate 203 downward synchronously through the connecting spring 204. The pressure plate 203 applies pressure to the water in the water tank 201, and the water in the water tank 201 is pushed open and sprayed. The valve 212 inside the water pipe 211 sprays water downwards through the nozzle of the water spray pipe 211, forming a water curtain to cool the high-temperature hot air escaping when the door panel 400 is opened, preventing burns to the operator; after the door panel 400 is fully opened, the moving plate 205 stops moving downwards, the connecting spring 204 is in the maximum tension state, pulling the pressure plate 203 to continue moving downwards and maintaining the pressure on the water, maintaining the water spray cooling state; after the water in the water tank 201 is exhausted, the heat-treated metal workpiece can be transported to the outside of the housing 100 through the control system.

[0034] Next, the door panel 400 can be closed, the connecting rod 209 drives the rotating block 208 to rotate in the opposite direction, the steel rope 207 becomes loose, the moving plate 205 resets upward under the elastic force of the connecting spring 204, the pressure plate 203 moves upward synchronously under the combined action of the reset spring 202 and the connecting spring 204, the cooling mechanism 200 returns to its initial state, and water can be replenished through the water inlet of the water tank 201 to prepare for the next heat treatment operation.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat treatment device for surface hardness of mechanical metal materials, comprising a housing (100), characterized in that: The outer wall of the housing (100) is hinged to a door panel (400), and also includes: A cooling mechanism (200) is disposed on the outer wall of the housing (100); A flame nozzle (500) is disposed in the inner wall of the housing (100) via a connecting mechanism (300); The cooling mechanism (200) includes a water tank (201). The inner wall of the water tank (201) is elastically connected to a pressure plate (203) via a return spring (202). The outer wall of the bottom end of the pressure plate (203) is elastically connected to a moving plate (205) via a connecting spring (204). The inner wall of the water tank (201) is rotatably connected to a rotating wheel (206). The outer wall of the rotating wheel (206) is wound with a steel rope (207). The outer wall of the door panel (400) is fixedly connected to a connecting rod (209). The outer wall of the shell (100) is fixedly connected to a fixing block (210). The inner wall of the fixing block (210) is rotatably connected to a rotating block (208). The outer wall of the water tank (201) is fixedly connected to a spray pipe (211).

2. The surface hardness heat treatment equipment for mechanical metal materials according to claim 1, characterized in that: The water tank (201) is fixedly connected to the outer wall of the shell (100), and the inner wall of the spray pipe (211) is provided with a valve (212).

3. The surface hardness heat treatment equipment for mechanical metal materials according to claim 1, characterized in that: One end of the reset spring (202) is fixedly connected to the outer wall of the pressure plate (203), and the other end of the reset spring (202) is fixedly connected to the inner wall of the water tank (201). The pressure plate (203) is slidably connected to the inner wall of the water tank (201).

4. The surface hardness heat treatment equipment for mechanical metal materials according to claim 1, characterized in that: One end of the connecting spring (204) is fixedly connected to the outer wall of the moving plate (205), the other end of the connecting spring (204) is fixedly connected to the outer wall of the pressure plate (203), and the moving plate (205) is slidably connected to the inner wall of the water tank (201).

5. The surface hardness heat treatment equipment for mechanical metal materials according to claim 1, characterized in that: The two ends of the steel rope (207) are fixedly connected to the outer walls of the rotating block (208) and the moving plate (205), respectively. The steel rope (207) is wound around the outer wall of the rotating block (208). The connecting rod (209) is fixedly connected to the outer wall of the rotating block (208). The connecting rod (209) is rotatably connected to the inner wall of the fixed block (210).

6. The surface hardness heat treatment equipment for mechanical metal materials according to claim 1, characterized in that: The connecting mechanism (300) includes a connecting block (301), the outer wall of which has a through groove (302), the inner wall of which is rotatably connected to a rotating rod (303), the outer wall of which is fixedly connected to a gear A (304), the inner wall of which is rotatably connected to a gear B (305), the outer wall of which is fixedly connected to a rotating ring (306), and the outer wall of which is connected to a hinge rod (307). A slider (308) is hinged to the inner wall of the rotating rod (303) and a trapezoidal block (310) is elastically connected to the inner wall of the rotating rod (303) via a telescopic spring (309). A pressure rod (311) is fixedly connected to the outer wall of the trapezoidal block (310). A protrusion (312) is slidably connected to the inner wall of the rotating rod (303). A slide rod (313) is fixedly connected to the outer wall of the protrusion (312). A fixing ring (314) is fixedly connected to the outer wall of the connecting block (301). A groove (315) is provided on the inner wall of the fixing ring (314).

7. The surface hardness heat treatment equipment for mechanical metal materials according to claim 6, characterized in that: The connecting block (301) is fixedly connected to the inner wall of the housing (100), the gear A (304) meshes with the gear B (305), and the rotating ring (306) is rotatably connected to the inner wall of the connecting block (301).

8. The surface hardness heat treatment equipment for mechanical metal materials according to claim 6, characterized in that: The two ends of the hinge rod (307) are respectively hinged to the outer walls of the slider (308) and the rotating ring (306), the slider (308) is slidably connected to the inner wall of the connecting block (301), and the trapezoidal block (310) is slidably connected to the inner wall of the rotating rod (303).

9. The heat treatment equipment for surface hardness of mechanical metal materials according to claim 6, characterized in that: One end of the telescopic spring (309) is fixedly connected to the outer wall of the trapezoidal block (310), the other end of the telescopic spring (309) is fixedly connected to the inner wall of the rotating rod (303), and the sliding rod (313) is slidably connected to the outer wall of the trapezoidal block (310).

10. The surface hardness heat treatment equipment for mechanical metal materials according to claim 6, characterized in that: The protrusion (312) engages with the groove (315), and the rotating rod (303) is rotatably connected to the inner wall of the fixing ring (314).

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