Multi-layer high-chromium cast iron heat treatment device and method

Abstract

The invention discloses a multi-layer high-chromium cast iron heat treatment device and method, and relates to the technical field of heat treatment devices.The multi-layer high-chromium cast iron heat treatment device comprises a base, a heat treatment furnace is arranged at the top of the base, two guide rails are arranged on one side of the heat treatment furnace, a furnace door is slidably installed between the two guide rails, and a first placement plate is arranged in the heat treatment furnace; a lifting mechanism is arranged on the top of the heat treatment furnace, and a feeding mechanism is arranged on the top of the base and located on one side of the furnace door. According to the cooling mechanism, a third motor drives a moving plate to reciprocate, a piston barrel is driven to automatically extract and convey cooling liquid through cooperation with gear and rack transmission, water mist is formed through an atomizing nozzle and is evenly sprayed, the contact area of the cooling liquid and a workpiece is increased, and the cooling speed is increased; and meanwhile, the moving plate reciprocates to enable water mist to cover all areas of the workpiece, workpiece cracking caused by too fast or too slow local cooling is avoided, the cooling quality is guaranteed, and meanwhile the overall machining period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment devices, in particular to a multi-layer high-chromium cast iron heat treatment device and method. BACKGROUND

[0002] The multi-layer high-chromium cast iron heat treatment device is an industrial furnace equipment specially designed for processing wear-resistant parts (such as grinding rollers and grinding discs), which adopts a multi-layer rack or conveying mechanism to realize the stereoscopic and batch loading of workpieces, and uses a precise temperature control system to perform high-temperature austenitizing, quenching and tempering and other heat treatment processes on the high-chromium cast iron workpieces in a sealed furnace chamber, aiming to eliminate casting stress, optimize carbide distribution and improve matrix hardness and toughness, thereby greatly enhancing the wear resistance and comprehensive mechanical properties of the workpieces, and is an essential equipment for producing key wear-resistant parts in the mining, cement and power industries.

[0003] After searching, the publication number CN220788706U discloses a wear-resistant alloy cast iron part heat treatment device, which comprises a heat treatment box, a sealing assembly, a push-pull cart, a push-pull rod and a guide plate. The heat treatment box is provided with guide rails, the sealing assembly is arranged on the left side of the heat treatment box, the top end of the push-pull cart is provided with a plurality of supporting blocks, the push-pull cart is provided with a clamping hole, the bottom of the push-pull cart is provided with wheels, the wheels are placed on the guide rails, one end of the push-pull rod is provided with a clamping block, the clamping block is clamped with the push-pull cart through the clamping hole, and the guide plate is arranged on the left side of the guide rail. In the utility model, the push-pull rod can be clamped in the clamping hole through the clamping block, and the push-pull cart can be pushed or pulled to move on the guide rail after being clamped. Since the cast iron parts are placed on the push-pull cart for heat treatment, the feeding and discharging can be carried out outside the heat treatment box for convenient use. The guide plate arranged simultaneously plays a guiding effect for discharging. However, in the comparative document, the workpiece is directly placed on the supporting block of the push-pull cart, and the workpiece is in contact with the push-pull cart during the heat treatment process. When heated, the bottom of the workpiece and the contact area with the push-pull cart are prone to uneven heating, affecting the heat treatment effect. After heat treatment, the workpiece needs to be naturally cooled or manually transferred to the outside for cooling, which not only prolongs the cooling period, but also may cause cracks in the multi-layer high-chromium cast iron due to uneven cooling speed.

[0004] Based on this, the present application provides a multi-layer high-chromium cast iron heat treatment device and method, which can eliminate the disadvantages of existing devices. UTILITY MODEL CONTENTS

[0005] The present application aims to provide a multi-layer high-chromium cast iron heat treatment device and method to solve the problem of uneven heating of the bottom of the workpiece and the contact area with the push-pull cart, affecting the heat treatment effect, and the possibility of cracks in the multi-layer high-chromium cast iron due to uneven cooling speed.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A multi-layer high-chromium cast iron heat treatment device, comprising a base, a heat treatment furnace is arranged on the top of the base, two guide rails are arranged on one side of the heat treatment furnace, a furnace door is slidingly installed between the two guide rails, and a first placing plate is arranged in the heat treatment furnace;

[0008] A lifting mechanism is arranged on the top of the heat treatment furnace, a feeding mechanism is arranged on the top of the base and on one side of the furnace door, and a cooling mechanism is arranged on the top of the base and above the feeding mechanism.

[0009] In an optional solution, the cooling mechanism comprises two second mounting plates, a third lead screw is rotatably installed between the two second mounting plates through a bearing, a third motor is fixedly installed on one side of one of the second mounting plates, the third lead screw is driven by the third motor, a moving block is threadedly connected to the outside of the third lead screw, and a moving plate is arranged on the top of the moving block.

[0010] In an optional solution, two mounting pipes are symmetrically arranged on the top of the moving plate, and a plurality of atomizing nozzles are equidistantly arranged on the bottom of each of the two mounting pipes.

[0011] In an optional solution, two mounting rods are arranged on one side of the top of the moving plate, a mounting sleeve is arranged in each of the two mounting rods, and a piston cylinder is arranged in each of the two mounting sleeves.

[0012] In an optional solution, a sliding rod is slidingly installed in each of the two piston cylinders, a sealing plug is arranged at the top end of each of the two sliding rods, a reciprocating plate is arranged at the bottom end of each of the two sliding rods and penetrates the piston cylinder, a connecting rod is rotatably installed on the bottom of the reciprocating plate through a pin shaft, a cam is rotatably installed on one end of the connecting rod through a pin shaft, a gear is key-connected to one side of the cam, the gear is rotatably installed on the moving plate through a bearing, a rack is engagedly connected to the outside of the gear, and the rack is fixedly installed with the base.

[0013] In an optional solution, a water storage tank is arranged on the bottom of the moving plate, a water inlet pipe is arranged on one side of the water storage tank, a first one-way valve is arranged on one side of each of the two piston cylinders, a second one-way valve is arranged on the top of each of the two piston cylinders, a second connecting pipe is connected to one end of each of the two first one-way valves, one end of each of the two second connecting pipes is connected with a mounting pipe, a first connecting pipe is connected to one end of each of the two second one-way valves, and one end of each of the two first connecting pipes is connected with the water storage tank.

[0014] In one alternative embodiment: the lifting mechanism includes a fixed plate, which is fixedly installed on the top of the heat treatment furnace. A first lead screw is rotatably mounted between the fixed plate and the base via a bearing. A first motor is fixedly installed on the top of the fixed plate. The first lead screw is driven by the first motor. A lifting block is threadedly connected to the external thread of the first lead screw, and the lifting block is fixedly installed with the furnace door.

[0015] In one alternative embodiment: the feeding mechanism includes two slide rails, both of which are located on the top of the base. A slider is slidably mounted between the two slide rails. A hydraulic cylinder is fixedly mounted on the top of the slider. A second placement plate is fixedly mounted on the output end of the hydraulic cylinder. The top of the second placement plate and the first placement plate are both provided with staggered through slots. The second placement plate can pass through the first placement plate through the through slots. Two first mounting plates are provided on the top of the base. A second lead screw is rotatably mounted between the two first mounting plates via bearings. A second motor is fixedly mounted on one side of one of the first mounting plates. The second lead screw is driven by the second motor. The slider and the second lead screw are connected by a thread.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The cooling mechanism of this invention uses a third motor to drive a moving plate to move back and forth. In conjunction with gear and rack transmission, it drives a piston cylinder to automatically draw and deliver coolant. The coolant is then sprayed evenly through an atomizing nozzle, increasing the contact area between the coolant and the workpiece and accelerating the cooling speed. At the same time, the reciprocating movement of the moving plate allows the water mist to cover all areas of the workpiece, preventing localized cooling from being too fast or too slow, which could cause the workpiece to crack. This ensures the cooling quality while shortening the overall processing cycle.

[0018] 2. The feeding mechanism of this invention drives the second placement plate through a hydraulic cylinder. Combined with the through-slot design that is staggered from the first placement plate, it realizes the smooth transfer of the workpiece between the second placement plate and the first placement plate, avoids damage caused by collision and displacement during the transfer of the workpiece, ensures uniform heating of multi-layer high-chromium cast iron workpieces, and guarantees the heat treatment effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the cooling mechanism of the present invention.

[0021] Figure 3 This is a schematic diagram of the mounting pipe installation structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the sealing plug installation structure of the present invention.

[0023] Figure 5 This is a schematic diagram of the lifting mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the feeding mechanism of the present invention.

[0025] Figure reference numerals: 1. Base; 2. Heat treatment furnace; 3. Guide rail; 4. Furnace door; 5. First placement plate; 6. Lifting mechanism; 61. Fixing plate; 62. First lead screw; 63. First motor; 64. Lifting block; 7. Feeding mechanism; 71. Slide rail; 72. Slider; 73. Hydraulic cylinder; 74. Second placement plate; 75. First mounting plate; 76. Second lead screw; 77. Second motor; 8. Cooling mechanism; 81. Second mounting plate; 82. Third lead screw; 83. ... Three motors; 84. Moving block; 85. Moving plate; 86. Mounting pipe; 87. Atomizing nozzle; 88. Mounting rod; 89. Mounting sleeve; 810. Piston cylinder; 811. Slide rod; 812. Sealing plug; 813. Reciprocating plate; 814. Connecting rod; 815. Cam; 816. Gear; 817. Rack; 818. Water tank; 819. Water inlet pipe; 820. First check valve; 821. Second check valve; 822. First connecting pipe; 823. Second connecting pipe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] In one embodiment, such as Figures 1-6 As shown, a multi-layer high-chromium cast iron heat treatment device includes a base 1, a heat treatment furnace 2 is provided on the top of the base 1, two guide rails 3 are provided on one side of the heat treatment furnace 2, a furnace door 4 is slidably installed between the two guide rails 3, and a first placement plate 5 is provided inside the heat treatment furnace 2.

[0028] The heat treatment furnace 2 is provided with a lifting mechanism 6 at the top, a feeding mechanism 7 is provided at the top of the base 1 and on one side of the furnace door 4, and a cooling mechanism 8 is provided at the top of the base 1 and above the feeding mechanism 7.

[0029] In this embodiment, the cooling mechanism 8 drives the moving plate 85 to reciprocate via the third motor 83. This, combined with the gear 816 and rack 817, drives the piston cylinder 810 to automatically extract and deliver coolant. The coolant is then evenly sprayed through the atomizing nozzle 87, increasing the contact area between the coolant and the workpiece and accelerating the cooling process. Simultaneously, the reciprocating movement of the moving plate 85 allows the water mist to cover all areas of the workpiece, preventing localized overheating or underheating that could lead to cracking. This ensures cooling quality while shortening the overall processing cycle. The loading mechanism 7 drives the second placement plate 74 via the hydraulic cylinder 73. Combined with a slot design that is offset from the first placement plate 5, this allows for smooth transfer of the workpiece between the second placement plate 74 and the first placement plate 5, preventing damage caused by collisions or displacement during transfer. This ensures uniform heating of the multi-layer high-chromium cast iron workpiece and guarantees the heat treatment effect.

[0030] The cooling mechanism 8 includes two second mounting plates 81. A third lead screw 82 is rotatably mounted between the two second mounting plates 81 via a bearing. A third motor 83 is fixedly mounted on one side of one of the second mounting plates 81. The third lead screw 82 is driven by the third motor 83. A moving block 84 is threadedly connected to the external side of the third lead screw 82. A moving plate 85 is provided on the top of the moving block 84. Two mounting tubes 86 are symmetrically arranged on the top of the moving plate 85. Multiple atomizing nozzles 87 are equidistantly arranged at the bottom of each of the two mounting tubes 86. Two mounting rods 88 are provided on one side of the top of the moving plate 85. A mounting sleeve 89 is provided inside each of the two mounting rods 88. Each mounting sleeve 89 contains a piston cylinder 810. A slide rod 811 is slidably mounted inside each piston cylinder 810. A sealing plug 812 is provided at the top of each slide rod 811. The bottom of each slide rod 811 passes through the piston cylinder 810 and is provided with a reciprocating plate 813. A connecting rod 814 is rotatably mounted on the bottom of the reciprocating plate 813 via a pin. A cam 815 is rotatably mounted on one end of the connecting rod 814 via a pin. A gear 816 is keyed to one side of the cam 815, and the gear 816 is rotatably mounted to the moving plate 85 via a bearing. A rack 817 is externally meshed with the gear 816, and the rack 817 is fixedly mounted to the base 1. The bottom of the movable plate 85 is provided with a water storage tank 818, and a water inlet pipe 819 is provided on one side of the water storage tank 818. Each of the two piston cylinders 810 has a first one-way valve 820 on one side and a second one-way valve 821 on the top of each of the two piston cylinders 810. One end of each of the two first one-way valves 820 is connected to a second connecting pipe 823, and one end of each of the two second connecting pipes 823 is connected to two mounting pipes 86 respectively. One end of each of the two second one-way valves 821 is connected to a first connecting pipe 822, and one end of each of the two first connecting pipes 822 is connected to the water storage tank 818. The core advantage of the cooling mechanism 8 is that it adopts an integrated design that sprays water mist upon movement. The moving structure eliminates the need for an additional water pump to extract and spray coolant: When the third motor 83 drives the moving plate 85 to move back and forth, the gear 816 at the bottom of the moving plate 85 automatically meshes with the rack 817 fixed on the base 1, driving the cam 815 to rotate. This, in turn, drives the slide rod 811 to slide inside the piston cylinder 810 via the connecting rod 814 and the reciprocating plate 813. When the slide rod 811 moves upward, a negative pressure is formed inside the piston cylinder 810 to extract coolant from the water tank 818. When it moves downward, the coolant is pumped to the mounting pipe 86 and sprayed out through the atomizing nozzle 87. The entire process is driven by the reciprocating power of the moving plate 85 to directly drive the liquid delivery, simplifying the equipment structure and reducing maintenance costs and downtime risks caused by water pump failure.Simultaneously, the reciprocating movement of the moving plate 85 is synchronized with the spraying. The atomizing nozzle 87, along with the moving plate 85, fully covers the workpiece surface, avoiding cooling dead zones. The continuous and stable water mist output ensures consistent cooling rates across all areas of the multi-layer high-chromium cast iron, effectively mitigating internal stress caused by differences in the thermal expansion coefficients of the multi-layer materials and reducing the risk of workpiece cracking and interlayer delamination. Furthermore, the atomized spray significantly increases the contact area between the coolant and the workpiece, accelerating heat exchange efficiency, significantly shortening the cooling cycle, and helping to improve overall heat treatment efficiency, thus meeting the needs of industrial mass production.

[0031] The lifting mechanism 6 includes a fixed plate 61, which is fixedly installed on the top of the heat treatment furnace 2. A first lead screw 62 is rotatably mounted between the fixed plate 61 and the base 1 via a bearing. A first motor 63 is fixedly installed on the top of the fixed plate 61. The first lead screw 62 is driven by the first motor 63. A lifting block 64 is threadedly connected to the outside of the first lead screw 62, and the lifting block 64 is fixedly installed with the furnace door 4. Then, when the lifting mechanism 6 is started, the first motor 63 drives the first lead screw 62 between the fixed plate 61 and the base 1 to rotate. The lifting block 64 outside the first lead screw 62 drives the furnace door 4 to slide upward along the two guide rails 3 and lift it up, opening the heat treatment furnace 2. Similarly, the first motor 63 can close the furnace door 4 of the heat treatment furnace 2 by rotating in the opposite direction.

[0032] The feeding mechanism 7 includes two slide rails 71, both of which are located on the top of the base 1. A slider 72 is slidably mounted between the two slide rails 71. A hydraulic cylinder 73 is fixedly mounted on the top of the slider 72. A second placement plate 74 is fixedly mounted on the output end of the hydraulic cylinder 73. The tops of the second placement plate 74 and the first placement plate 5 are provided with staggered through slots. The second placement plate 74 can pass through the first placement plate 5 through the through slots. Two first mounting plates 75 are provided on the top of the base 1. A second lead screw 76 is rotatably mounted between the two first mounting plates 75 via bearings. A second motor 77 is fixedly mounted on one side of one of the first mounting plates 75. Driven by the second motor 77, the slider 72 and the second lead screw 76 are threadedly connected. The second motor 77 drives the second lead screw 76 between the two first mounting plates 75 to rotate. The slider 72 outside the second lead screw 76 slides along the two slide rails 71 towards the heat treatment furnace 2, sending the second placement plate 74 carrying the workpiece into the heat treatment furnace 2. Then the hydraulic cylinder 73 retracts, driving the second placement plate 74 to move downward. Since the second placement plate 74 and the first placement plate 5 have staggered through slots at the top, the second placement plate 74 can pass through the first placement plate 5, and the multi-layer high-chromium cast iron workpiece is smoothly transferred to the top of the first placement plate 5. Similarly, after the heat treatment is completed, the multi-layer high-chromium cast iron can be taken out by the feeding mechanism 7.

[0033] The working principle of this invention is:

[0034] Step 1: First, place the multi-layer high-chromium cast iron workpiece to be heat-treated above the second placement plate 74; then start the lifting mechanism 6, the first motor 63 drives the first lead screw 62 between the fixed plate 61 and the base 1 to rotate, and the lifting block 64 outside the first lead screw 62 drives the furnace door 4 to slide upward along the two guide rails 3 to open the heat treatment furnace 2.

[0035] Step 2: Next, start the feeding mechanism 7. The second motor 77 drives the second lead screw 76 between the two first mounting plates 75 to rotate. The slider 72 outside the second lead screw 76 slides along the two slide rails 71 towards the heat treatment furnace 2, sending the second placement plate 74 carrying the workpiece into the heat treatment furnace 2. Then, the hydraulic cylinder 73 retracts, driving the second placement plate 74 to move downward. Since the second placement plate 74 and the top of the first placement plate 5 have staggered through slots, the second placement plate 74 can pass through the first placement plate 5, and the multi-layer high-chromium cast iron workpiece is smoothly transferred to the top of the first placement plate 5.

[0036] Step 3: Then the feeding mechanism 7 works again. The second motor 77 drives the second lead screw 76 in the reverse direction, so that the slider 72 drives the second placement plate 74 to return to the initial position. The first motor 63 of the lifting mechanism 6 drives the first lead screw 62 in the reverse direction, so that the furnace door 4 slides down to close the heat treatment furnace 2. The heat treatment furnace 2 starts and heat treats the multi-layer high-chromium cast iron workpieces inside.

[0037] Step 4: After the heat treatment is completed, repeat the operation of the lifting mechanism 6 to open the furnace door 4. The feeding mechanism 7 will send the second placement plate 74 into the heat treatment furnace 2 again. The hydraulic cylinder 73 will extend to lift the workpiece with the second placement plate 74. Then the workpiece will be taken out and transferred to the cooling mechanism 8.

[0038] Step 5: At this time, the cooling mechanism 8 is activated. The third motor 83 rotates alternately in both directions, driving the third lead screw 82 between the two second mounting plates 81 to rotate. The moving block 84 outside the third lead screw 82 drives the moving plate 85 to move back and forth. During the movement of the moving plate 85, the gear 816 at its bottom meshes with the rack 817 fixed on the base 1, driving the gear 816 to rotate synchronously. The cam 815 on one side of the gear 816 rotates accordingly, driving the reciprocating plate 813 to move up and down through the connecting rod 814. The reciprocating plate 813 drives the two sliding rods 811 to slide inside the corresponding piston cylinder 810. When the slide rod 811 moves upward, the sealing plug 812 moves upward simultaneously, creating a negative pressure inside the piston cylinder 810. The liquid in the water tank 818 is drawn into the piston cylinder 810 through the first connecting pipe 822 and the second one-way valve 821. When the slide rod 811 moves downward, the liquid inside the piston cylinder 810 is pressurized and transported to the two mounting pipes 86 through the first one-way valve 820 and the second connecting pipe 823. Finally, the liquid is atomized and sprayed out through multiple atomizing nozzles 87 at the bottom of the mounting pipes 86. The water mist, in conjunction with the reciprocating moving plate 85, quickly and uniformly cools the multi-layer high-chromium cast iron workpiece below.

[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-layer high-chromium cast iron heat treatment device, comprising a base (1), a heat treatment furnace (2) is provided on the top of the base (1), two guide rails (3) are provided on one side of the heat treatment furnace (2), a furnace door (4) is slidably installed between the two guide rails (3), and a first placement plate (5) is provided inside the heat treatment furnace (2). Its features are, The heat treatment furnace (2) is provided with a lifting mechanism (6) at the top, a feeding mechanism (7) is provided at the top of the base (1) and on one side of the furnace door (4), and a cooling mechanism (8) is provided at the top of the base (1) and above the feeding mechanism (7).

2. The multi-layer high-chromium cast iron heat treatment apparatus according to claim 1, characterized in that, The cooling mechanism (8) includes two second mounting plates (81), and a third lead screw (82) is rotatably mounted between the two second mounting plates (81) via a bearing. A third motor (83) is fixedly mounted on one side of one of the second mounting plates (81). The third lead screw (82) is driven by the third motor (83). A moving block (84) is threaded onto the outside of the third lead screw (82), and a moving plate (85) is provided on the top of the moving block (84).

3. The multi-layer high-chromium cast iron heat treatment apparatus according to claim 2, characterized in that, The top of the movable plate (85) is symmetrically provided with two mounting tubes (86), and the bottom of the two mounting tubes (86) is provided with multiple atomizing nozzles (87) at equal intervals.

4. The multi-layer high-chromium cast iron heat treatment apparatus according to claim 3, characterized in that, Two mounting rods (88) are provided on one side of the top of the movable plate (85). Each of the two mounting rods (88) is provided with a mounting sleeve (89), and each of the two mounting sleeves (89) is provided with a piston cylinder (810).

5. The multi-layer high-chromium cast iron heat treatment apparatus according to claim 4, characterized in that, Both piston cylinders (810) have sliding rods (811) slidably installed inside them. Each of the two sliding rods (811) has a sealing plug (812) at its top end. The bottom ends of the two sliding rods (811) pass through the piston cylinders (810) and are provided with reciprocating plates (813). A connecting rod (814) is rotatably installed at the bottom of the reciprocating plate (813) via a pin. A cam (815) is rotatably installed at one end of the connecting rod (814) via a pin. A gear (816) is keyed to one side of the cam (815). The gear (816) is rotatably installed with a moving plate (85) via a bearing. A rack (817) is meshed with the outside of the gear (816). The rack (817) is fixedly installed with the base (1).

6. The multi-layer high-chromium cast iron heat treatment apparatus according to claim 5, characterized in that, A water storage tank (818) is provided at the bottom of the movable plate (85). A water inlet pipe (819) is provided on one side of the water storage tank (818). A first one-way valve (820) is provided on one side of each of the two piston cylinders (810). A second one-way valve (821) is provided on the top of each of the two piston cylinders (810). A second connecting pipe (823) is connected to one end of each of the two first one-way valves (820). One end of each of the two second connecting pipes (823) is connected to one of the two mounting pipes (86). A first connecting pipe (822) is connected to one end of each of the two second one-way valves (821). One end of each of the two first connecting pipes (822) is connected to the water storage tank (818).

7. The multi-layer high-chromium cast iron heat treatment apparatus according to claim 1, characterized in that, The lifting mechanism (6) includes a fixed plate (61), which is fixedly installed on the top of the heat treatment furnace (2). A first lead screw (62) is rotatably installed between the fixed plate (61) and the base (1) via a bearing. A first motor (63) is fixedly installed on the top of the fixed plate (61). The first lead screw (62) is driven by the first motor (63). A lifting block (64) is threadedly connected to the outside of the first lead screw (62), and the lifting block (64) is fixedly installed with the furnace door (4).

8. The multi-layer high-chromium cast iron heat treatment apparatus according to claim 1, characterized in that, The feeding mechanism (7) includes two slide rails (71), both of which are located on the top of the base (1). A slider (72) is slidably installed between the two slide rails (71). A hydraulic cylinder (73) is fixedly installed on the top of the slider (72). A second placement plate (74) is fixedly installed at the output end of the hydraulic cylinder (73). The top of the second placement plate (74) and the first placement plate (5) are provided with staggered through slots. The second placement plate (74) can pass through the first placement plate (5) through the through slots. Two first mounting plates (75) are provided on the top of the base (1). A second lead screw (76) is rotatably installed between the two first mounting plates (75) through a bearing. A second motor (77) is fixedly installed on one side of one of the first mounting plates (75). The second lead screw (76) is driven by the second motor (77). The slider (72) and the second lead screw (76) are connected by a thread.

9. A method of using a multi-layer high-chromium cast iron heat treatment apparatus according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: First, place the multi-layer high-chromium cast iron workpiece to be heat-treated above the second placement plate (74); then start the lifting mechanism (6), the first motor (63) drives the first lead screw (62) between the fixed plate (61) and the base (1) to rotate, and the lifting block (64) outside the first lead screw (62) drives the furnace door (4) to slide upward along the two guide rails (3) to open the heat treatment furnace (2); Step 2: Next, start the feeding mechanism (7). The second motor (77) drives the second lead screw (76) between the two first mounting plates (75) to rotate. The slider (72) outside the second lead screw (76) slides along the two slide rails (71) towards the heat treatment furnace (2) to send the second placement plate (74) carrying the workpiece into the heat treatment furnace (2). Then the hydraulic cylinder (73) retracts, driving the second placement plate (74) to move downward. Since the second placement plate (74) and the first placement plate (5) have staggered through slots at the top, the second placement plate (74) can pass through the first placement plate (5), and the multi-layer high-chromium cast iron workpiece is smoothly transferred to the top of the first placement plate (5). Step 3: Then the feeding mechanism (7) works again, the second motor (77) drives the second lead screw (76) in the reverse direction, so that the slider (72) drives the second placement plate (74) to reset to the initial position, the first motor (63) of the lifting mechanism (6) drives the first lead screw (62) in the reverse direction, so that the furnace door (4) slides down to close the heat treatment furnace (2), the heat treatment furnace (2) starts and heat treats the multi-layer high chromium cast iron workpieces inside; Step 4: After the heat treatment is completed, repeat the operation of the lifting mechanism (6) to open the furnace door (4), and the feeding mechanism (7) sends the second placement plate (74) into the heat treatment furnace (2) again. The hydraulic cylinder (73) extends to make the second placement plate (74) lift the workpiece, and then the workpiece is taken out and transferred to the cooling mechanism (8). Step 5: At this time, the cooling mechanism (8) is activated. The third motor (83) rotates alternately in both directions, driving the third lead screw (82) between the two second mounting plates (81) to rotate. The moving block (84) outside the third lead screw (82) drives the moving plate (85) to move back and forth. During the movement of the moving plate (85), the gear (816) at its bottom meshes with the rack (817) fixed on the base (1), driving the gear (816) to rotate synchronously. The cam (815) on one side of the gear (816) rotates accordingly, driving the reciprocating plate (813) to move up and down through the connecting rod (814). The reciprocating plate (813) drives the two sliding rods (811) to move in the corresponding piston cylinder (81). 0) Sliding inside; when the slide rod (811) moves upward, the sealing plug (812) moves upward synchronously, and a negative pressure is formed inside the piston cylinder (810). The liquid in the water tank (818) is drawn into the piston cylinder (810) through the first connecting pipe (822) and the second one-way valve (821); when the slide rod (811) moves downward, the liquid in the piston cylinder (810) is pressurized and transported to the two mounting pipes (86) through the first one-way valve (820) and the second connecting pipe (823). Finally, it is atomized and sprayed out through multiple atomizing nozzles (87) at the bottom of the mounting pipe (86). The water mist cooperates with the reciprocating moving plate (85) to quickly and uniformly cool the multi-layer high-chromium cast iron workpiece below.

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