Heat treatment device and precious metal recovery equipment

Abstract

The invention discloses a heat treatment device and precious metal recovery equipment, and relates to the technical field of precious metal recovery equipment.The heat treatment device comprises a working frame, a reaction box is fixedly installed on the working frame, a conveying frame is fixedly installed at the top of the reaction box, and a smashing cylinder is fixedly installed at the top of the conveying frame; the bottom of the smashing cylinder, the conveying frame and the top of the reaction box are communicated, an opening is formed in the top of the smashing cylinder, a smashing assembly is arranged in the smashing cylinder, a scraping assembly is arranged in the conveying frame, and a transmission assembly for driving the scraping assembly to move is further arranged on one side of the conveying frame. And a screening assembly is arranged in the reaction box. Raw materials can be crushed, and the follow-up treatment efficiency is improved by decomposing large metal scraps into small-size fragments.

Description

Technical Field

[0001] The present invention relates to the technical field of precious metal recovery equipment, and in particular to a heat treatment device and precious metal recovery equipment. Background Art

[0002] Precious metal recovery equipment has gradually developed in recent years with the increase of resource recycling and environmental awareness. Precious metals are widely used in electronics, chemical industry, medical and other fields due to their unique physical and chemical properties. However, precious metal resources are relatively scarce, and the cost of mining and refining is high. Therefore, recovering precious metals from waste is not only economically valuable, but also environmentally friendly. Heat treatment equipment plays a vital role in industrial production. It changes the internal structure of materials by heating, heat preservation and cooling them, thereby improving the performance of materials.

[0003] The Chinese utility model patent with the publication number CN221797620U discloses a heat treatment device and precious metal recovery equipment, wherein the heat treatment device includes: a vessel, a heating mechanism, a cooling mechanism and a driving mechanism, the vessel is used to load the raw materials to be processed, the heating mechanism is used to heat the raw materials loaded in the vessel, the cooling mechanism is used to cool the raw materials loaded in the vessel, and the driving mechanism is connected to the vessel and used to drive the vessel to alternately dock with the heating mechanism and the cooling mechanism. By adopting the above technical solution, the raw materials after heat treatment by the heating mechanism can be transferred to the cooling mechanism together with the vessel without being taken out from the vessel, thus saving the steps of transferring the raw materials in different vessels and reducing the complexity of the process; in addition, the raw materials are taken out only after being transferred to the cooling mechanism together with the vessel, so as to avoid affecting the continuous operation of the heating mechanism. At this time, the heating mechanism can still perform heat treatment on the raw materials in the next vessel, thus improving the processing efficiency.

[0004] However, the above prior art still has the following deficiencies: Precious metal recycling is generally extracted from electronic waste, industrial catalysts or other materials containing precious metals, which are often mixed with non-metallic impurities such as plastics and rubber, and there may be oil stains on the metal surface. If these impurities are not handled in time, they will affect the efficiency of heat treatment. Summary of the invention

[0005] The purpose of the present invention is to provide a heat treatment device to solve the technical problem that in the prior art, precious metal recovery is generally extracted from electronic waste, industrial catalysts or other materials containing precious metals, which are often mixed with non-metallic impurities such as plastics and rubber, and there may be oil stains on the metal surface. If these impurities are not handled in time, they will affect the efficiency of heat treatment.

[0006] The present invention provides a heat treatment device, comprising a working frame, a reaction box is fixedly installed on the working frame, a conveying frame is fixedly installed on the top of the reaction box, a crushing barrel is fixedly installed on the top of the conveying frame, the bottom of the crushing barrel, the conveying frame and the top of the reaction box are connected, the top of the crushing barrel is opened, a crushing assembly is arranged inside the crushing barrel, a scraping assembly is arranged inside the conveying frame, a transmission assembly for driving the scraping assembly to move is also arranged on one side of the conveying frame, a screening assembly is arranged inside the reaction box, the crushing assembly comprises a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are symmetrically arranged about the central axis of the crushing barrel, and one end of the first rotating shaft and the second rotating shaft both pass through the crushing barrel and are rotatably connected to the crushing barrel, and crushing rollers are coaxially fixedly installed on the first rotating shaft and the second rotating shaft.

[0007] Preferably, a first motor is fixedly mounted on one end of the grinding cylinder, an output end of the first motor is fixedly connected to one end of a first rotating shaft, a first gear is coaxially fixedly mounted on the first rotating shaft, a second gear is coaxially fixedly mounted on the second rotating shaft, and the first gear is meshed with the second gear.

[0008] Preferably, the scraping assembly includes a square screen, which is arranged in a conveying frame, the top of the square screen is fixedly connected to the bottom of the crushing barrel, and the bottom of the square screen is fixedly connected to the reaction box, the outer sleeve of the square screen is provided with a square scraper, the square scraper is slidably arranged between the conveying frame and the square screen, and the inner side of the square scraper is provided with scraping bristles, one end of the square scraper is fixedly installed with a fixed shaft, one end of the conveying frame is provided with a slide groove, and one end of the fixed shaft passes through the slide groove and slidably cooperates with the slide groove.

[0009] As a further preference, the transmission assembly includes a transmission shaft, which is rotatably mounted on one end of the conveying frame, an incomplete gear is coaxially fixedly mounted on the end of the transmission shaft close to the conveying frame, a T-shaped rod is fixedly mounted on one side of the fixed shaft, the T-shaped rod is slidably connected to one end of the conveying frame, and a rack is fixedly mounted on one side of the T-shaped rod, the rack and the incomplete gear mesh when in contact, a fixed plate is also provided at one end of the conveying frame, a return spring is connected between the fixed plate and the T-shaped rod, and an end of the transmission shaft away from the conveying frame is connected to one end of the first rotating shaft through a transmission belt.

[0010] Preferably, the screening component includes a third rotating shaft and a fourth rotating shaft, the third rotating shaft and the fourth rotating shaft are symmetrically arranged about the middle part of the reaction box, and one end of the third rotating shaft and the fourth rotating shaft both pass through the reaction box and are rotatably connected to the reaction box, and a motor frame is fixedly installed at one end of the reaction box, a second motor is fixedly installed on the motor frame, an output end of the second motor is fixedly connected to one end of the third rotating shaft, a third gear is coaxially fixedly installed on the third rotating shaft, a fourth gear is coaxially fixedly installed on the fourth rotating shaft, and the third gear is meshed with the fourth gear.

[0011] As a further preference, a first sieve plate is fixedly mounted on the third rotating shaft, and a second sieve plate is fixedly mounted on the fourth rotating shaft, and the first sieve plate and the second sieve plate can fit with the inner wall of the reaction box when maintaining a horizontal state.

[0012] As a further preference, a trapezoidal baffle is fixedly mounted on one side of the second screen plate.

[0013] Preferably, the top of the reaction box is connected to a liquid inlet pipe, the bottom of the reaction box is connected to a liquid outlet pipe, both the liquid inlet pipe and the liquid outlet pipe are provided with a one-way liquid inlet valve, one end of the bottom of the reaction box is connected to an air inlet pipe, the other end of the bottom of the reaction box is connected to a discharge pipe, the air inlet pipe is provided with a one-way air inlet valve, and the discharge pipe is provided with a one-way feed valve.

[0014] As a further preference, a heating box is provided at the bottom of the work frame, the top of the heating box is connected to the discharge pipe, one end of the heating box is connected to a cooling box through a feed pipe, a preheating sleeve is also provided on the discharge pipe, and the heating box is also provided with a ventilation pipe for balancing the air pressure in the heating box.

[0015] A precious metal recovery device comprises a heat treatment device and a feeding funnel, wherein the feeding funnel is fixedly installed at the top opening of a pulverizing cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention can crush raw materials and improve the efficiency of subsequent processing by breaking down large pieces of metal waste into small pieces; (2) The square scraper can continuously slide up and down in the conveying frame, and use the scraping hair on its inner side to continuously scrape off the metal waste attached to the square screen, ensuring that all the metal waste can fall into the reaction box, thereby improving work efficiency; (3) Add reaction reagents into the reaction box through the liquid inlet pipe to clean the oil, coating or rust on the metal surface. Non-metallic impurities such as plastic and rubber will be blocked by the first sieve plate and the second sieve plate and will not mix with the precious metals, thus ensuring the purity of the precious metal raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A three-dimensional diagram of a heat treatment device provided by the present invention; Figure 2 A cross-sectional view of a heat treatment device provided by the present invention; Figure 3 for Figure 2 A in the enlarged view; Figure 4 for Figure 2 The enlarged view of point B in the figure; Figure 5 A schematic diagram of the partial structure of the reaction box provided by the present invention; Figure 6 A schematic diagram of a first working state of the screening assembly provided by the present invention; Figure 7 This is a schematic diagram of a second working state of the screening component provided by the present invention.

[0019] Reference numerals: 1, work frame; 2, reaction box; 3, conveying frame; 4, crushing cylinder; 5, crushing assembly; 6, scraping assembly; 7, transmission assembly; 8, screening assembly; 9, feeding funnel; 11, liquid inlet pipe; 12, liquid outlet pipe; 13, air inlet pipe; 14, outlet pipe; 15, preheating sleeve; 16, heating box; 17, cooling box; 18, ventilation pipe; 51, first rotating shaft; 52, second rotating shaft; 53, first motor; 54, first gear; 55. Second gear; 56. Crushing roller; 61. Square screen; 62. Square scraper; 63. Fixed shaft; 64. Slide; 71. Transmission shaft; 72. Incomplete gear; 73. T-bar; 74. Rack; 75. Fixed plate; 76. Return spring; 81. Third rotating shaft; 82. Fourth rotating shaft; 83. Second motor; 84. Third gear; 85. Fourth gear; 86. First sieve plate; 87. Second sieve plate; 88. Trapezoidal baffle. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] In this embodiment, if Figures 1 to 7As shown, a heat treatment device includes a working frame 1, on which a reaction box 2 is fixedly installed, a conveying frame 3 is fixedly installed on the top of the reaction box 2, a crushing barrel 4 is fixedly installed on the top of the conveying frame 3, the bottom of the crushing barrel 4, the conveying frame 3 and the top of the reaction box 2 are connected, an opening is opened on the top of the crushing barrel 4, a crushing assembly 5 is arranged inside the crushing barrel 4, a scraping assembly 6 is arranged inside the conveying frame 3, and a transmission assembly 7 for driving the scraping assembly 6 to move is also arranged on one side of the conveying frame 3, a screening assembly 8 is arranged inside the reaction box 2, the crushing assembly 5 includes a first rotating shaft 51 and a second rotating shaft 52, the first rotating shaft 51 and the second rotating shaft 52 are symmetrically arranged about the central axis of the crushing barrel 4, and one end of the first rotating shaft 51 and the second rotating shaft 52 both penetrate the crushing barrel 4 and are rotatably connected to the crushing barrel 4, and crushing rollers 56 are coaxially fixedly installed on the first rotating shaft 51 and the second rotating shaft 52.

[0022] Specifically, a first motor 53 is fixedly mounted on one end of the crushing barrel 4, and an output end of the first motor 53 is fixedly connected to one end of the first rotating shaft 51. A first gear 54 is coaxially fixedly mounted on the first rotating shaft 51, and a second gear 55 is coaxially fixedly mounted on the second rotating shaft 52, and the first gear 54 meshes with the second gear 55. When the first motor 53 in the crushing assembly 5 is started, the first motor 53 drives the first rotating shaft 51 to rotate, and the second rotating shaft 52 is driven to rotate through the meshing of the first gear 54 and the second gear 55, so that the two crushing rollers 56 can be driven to crush the raw materials, and the subsequent processing efficiency is improved by breaking down large pieces of metal waste into small pieces.

[0023] Specifically, the scraping assembly 6 includes a square screen 61, which is arranged in the conveying frame 3, the top of the square screen 61 is fixedly connected to the bottom of the crushing barrel 4, and the bottom of the square screen 61 is fixedly connected to the reaction box 2, and the outer part of the square screen 61 is provided with a square scraper 62, the square scraper 62 is slidably arranged between the conveying frame 3 and the square screen 61, and the inner side of the square scraper 62 is provided with scraping bristles, one end of the square scraper 62 is fixedly installed with a fixed shaft 63, one end of the conveying frame 3 is provided with a slide groove 64, and one end of the fixed shaft 63 passes through the slide groove 64 and slides with the slide groove 64.

[0024] More specifically, the transmission assembly 7 includes a transmission shaft 71, which is rotatably mounted on one end of the conveying frame 3, an incomplete gear 72 is coaxially fixedly mounted on the end of the transmission shaft 71 close to the conveying frame 3, a T-shaped rod 73 is fixedly mounted on one side of the fixed shaft 63, the T-shaped rod 73 is slidably connected to one end of the conveying frame 3, and a rack 74 is fixedly mounted on one side of the T-shaped rod 73, the rack 74 meshes with the incomplete gear 72 when in contact, a fixed plate 75 is also provided at one end of the conveying frame 3, a return spring 76 is connected between the fixed plate 75 and the T-shaped rod 73, and the end of the transmission shaft 71 away from the conveying frame 3 is connected to one end of the first rotating shaft 51 through a transmission belt. The metal waste will pass through the square screen 61 on the scraping assembly 6, and some of the metal waste will adhere to the inner side of the square screen 61. Since the transmission shaft 71 in the transmission assembly 7 is connected to the first rotating shaft 51 through a transmission belt, the first rotating shaft 51 can drive the transmission shaft 71 to rotate when it rotates. The incomplete gear 72 on the transmission shaft 71 will mesh with the rack 74 when it contacts, driving the rack 74 to move downward, and drive the fixed shaft 63 to slide downward in the slide groove 64 through the T-shaped rod 73. Moreover, when the rack 74 is not in contact with the incomplete gear 72, it can move up through the reset spring 76 on the fixed plate 75. Therefore, the square scraper 62 can continuously slide up and down in the conveying frame 3, and use the scraping hair on its inner side to continuously scrape off the metal waste attached to the square screen 61, ensuring that all the metal waste can fall into the reaction box 2, thereby improving work efficiency.

[0025] Specifically, the screening component 8 includes a third rotating shaft 81 and a fourth rotating shaft 82, and the third rotating shaft 81 and the fourth rotating shaft 82 are symmetrically arranged about the middle part of the reaction box 2, and one end of the third rotating shaft 81 and the fourth rotating shaft 82 both pass through the reaction box 2 and are rotatably connected to the reaction box 2, and a motor frame is fixedly installed at one end of the reaction box 2, and a second motor 83 is fixedly installed on the motor frame, and an output end of the second motor 83 is fixedly connected to one end of the third rotating shaft 81, a third gear 84 is coaxially fixedly installed on the third rotating shaft 81, and a fourth gear 85 is coaxially fixedly installed on the fourth rotating shaft 82, and the third gear 84 is meshed with the fourth gear 85.

[0026] More specifically, a first sieve plate 86 is fixedly mounted on the third rotating shaft 81 , and a second sieve plate 87 is fixedly mounted on the fourth rotating shaft 82 . The first sieve plate 86 and the second sieve plate 87 can fit with the inner wall of the reaction box 2 when kept in a horizontal state.

[0027] More specifically, a trapezoidal baffle 88 is fixedly installed on one side of the second sieve plate 87. Reaction reagents are added into the reaction box 2 through the liquid inlet pipe 11 to clean the oil, coating or rust on the metal surface and reduce the pollution during the heat treatment process. After a period of reaction, the precious metal raw materials sink to the bottom of the reaction box 2, and non-metallic impurities such as plastics and rubber float on the top of the reaction liquid. Then the second motor 83 in the screening component 8 is started, and the second motor 83 drives the third rotating shaft 81 to rotate, and the third gear 84 and the fourth gear 85 are meshed to drive the fourth rotating shaft 82 to rotate, and finally the first sieve plate 86 and the second sieve plate 87 are rotated from a vertical state to a horizontal state. state, and the first sieve plate 86 and the second sieve plate 87 can fit with the inner wall of the reaction box 2 when maintaining a horizontal state. When the reaction liquid in the reaction box 2 is pumped out through the liquid outlet pipe 12, non-metallic impurities such as plastic and rubber will be blocked by the first sieve plate 86 and the second sieve plate 87 and will not be mixed with the precious metals. The trapezoidal baffle 88 on the second sieve plate 87 can fill the gap between the first sieve plate 86 and the second sieve plate 87 to prevent non-metallic impurities such as plastic and rubber from hiding in the dead corners between the first sieve plate 86, the second sieve plate 87 and the inner wall of the reaction box 2, thereby ensuring the purity of the precious metal raw materials.

[0028] Specifically, the top of the reaction box 2 is connected to a liquid inlet pipe 11, the bottom of the reaction box 2 is connected to a liquid outlet pipe 12, both the liquid inlet pipe 11 and the liquid outlet pipe 12 are provided with a one-way liquid inlet valve, one end of the bottom of the reaction box 2 is connected to an air inlet pipe 13, the other end of the bottom of the reaction box 2 is connected to a discharge pipe 14, the air inlet pipe 13 is provided with a one-way air inlet valve, and the discharge pipe 14 is provided with a one-way feed valve.

[0029] More specifically, a heating box 16 is provided at the bottom of the workbench 1, the top of the heating box 16 is connected to the discharge pipe 14, one end of the heating box 16 is connected to the cooling box 17 through a feed pipe, a preheating sleeve 15 is also provided on the discharge pipe 14, and the heating box 16 is also provided with a ventilation pipe 18 for balancing the air pressure in the heating box 16.

[0030] A precious metal recovery device comprises a heat treatment device and a feed funnel 9, wherein the feed funnel 9 is fixedly installed at the top opening of a pulverizing cylinder 4.

[0031] Working principle: Before the precious metal recovery equipment works, the raw materials to be processed are first transported into the crushing cylinder 4 of the heat treatment device through the feeding funnel 9, and then the first motor 53 in the crushing component 5 is started. The first motor 53 drives the first rotating shaft 51 to rotate, and the second rotating shaft 52 is driven to rotate through the meshing of the first gear 54 and the second gear 55, so that the two crushing rollers 56 can be driven to crush the raw materials. By breaking down large pieces of metal waste into small pieces, the efficiency of subsequent processing is improved. The crushed metal waste enters the reaction box 2 through the conveying frame 3. In this process, the metal waste will pass through the square screen 61 on the scraping component 6, and some of them will be The metal waste will adhere to the inner side of the square screen 61. Since the transmission shaft 71 in the transmission assembly 7 is connected to the first rotating shaft 51 through a transmission belt, the first rotating shaft 51 can drive the transmission shaft 71 to rotate when it rotates. The incomplete gear 72 on the transmission shaft 71 will mesh with the rack 74 when it contacts, driving the rack 74 to move downward, and drive the fixed shaft 63 to slide downward in the slide groove 64 through the T-shaped rod 73. Moreover, when the rack 74 is not in contact with the incomplete gear 72, it can move up through the reset spring 76 on the fixed plate 75. Therefore, the square scraper 62 can continuously slide up and down in the conveying frame 3, and use the scraping hair inside it to continuously scrape the square screen. 61, ensuring that all the metal waste can fall into the reaction box 2, improving work efficiency. When all the crushed metal waste falls into the reaction box 2, turn off the first motor 53, and add reaction reagents into the reaction box 2 through the liquid inlet pipe 11 to clean the oil, coating or rust on the metal surface, reduce pollution during the heat treatment process, and after a period of reaction, the precious metal raw materials sink to the bottom of the reaction box 2, and non-metallic impurities such as plastics and rubber will float above the reaction liquid. Then start the second motor 83 in the screening component 8, the second motor 83 drives the third shaft 81 to rotate, and the third gear 84 is engaged with the fourth gear 85 to drive the fourth shaft 8 2 rotates, and finally the first sieve plate 86 and the second sieve plate 87 rotate from a vertical state to a horizontal state, and the first sieve plate 86 and the second sieve plate 87 can fit with the inner wall of the reaction box 2 when maintaining the horizontal state. When the reaction liquid in the reaction box 2 is pumped out through the liquid outlet pipe 12, non-metallic impurities such as plastic and rubber will be blocked by the first sieve plate 86 and the second sieve plate 87 and will not be mixed with the precious metal. The trapezoidal baffle 88 on the second sieve plate 87 can make up for the gap between the first sieve plate 86 and the second sieve plate 87, and prevent non-metallic impurities such as plastic and rubber from hiding in the dead angle between the first sieve plate 86, the second sieve plate 87 and the inner wall of the reaction box 2, thereby ensuring the purity of the precious metal raw materials.Finally, the precious metal raw materials are blown toward the discharge pipe 14 through the air inlet pipe 13 and fall into the heating box 16. During this process, the preheating sleeve 15 can preheat and dry the precious metal raw materials in the discharge pipe 14. The precious metal raw materials are then heated to above the melting point by the heating box 16 to melt them into a liquid state. The precious metal raw materials are then passed into the cooling box 17 for cooling to complete the precious metal recovery work.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat treatment device, comprising a working frame (1), characterized in that: A reaction box (2) is fixedly mounted on the work frame (1); a conveying frame (3) is fixedly mounted on the top of the reaction box (2); a crushing cylinder (4) is fixedly mounted on the top of the conveying frame (3); the bottom of the crushing cylinder (4), the conveying frame (3) and the top of the reaction box (2) are connected; an opening is provided on the top of the crushing cylinder (4); a crushing assembly (5) is arranged inside the crushing cylinder (4); a scraping assembly (6) is arranged inside the conveying frame (3); and a driving scraping assembly is also arranged on one side of the conveying frame (3). (6) a moving transmission component (7), a screening component (8) is arranged inside the reaction box (2), and the pulverizing component (5) comprises a first rotating shaft (51) and a second rotating shaft (52), the first rotating shaft (51) and the second rotating shaft (52) are symmetrically arranged about the central axis of the pulverizing cylinder (4), and one end of the first rotating shaft (51) and the second rotating shaft (52) both penetrate the pulverizing cylinder (4) and are rotatably connected to the pulverizing cylinder (4), and a pulverizing roller (56) is coaxially fixedly mounted on the first rotating shaft (51) and the second rotating shaft (52).

2. A heat treatment device according to claim 1, characterized in that: A first motor (53) is fixedly mounted on one end of the pulverizing cylinder (4); an output end of the first motor (53) is fixedly connected to one end of a first rotating shaft (51); a first gear (54) is coaxially fixedly mounted on the first rotating shaft (51); a second gear (55) is coaxially fixedly mounted on the second rotating shaft (52); and the first gear (54) meshes with the second gear (55).

3. A heat treatment device according to claim 1, characterized in that: The scraping assembly (6) comprises a square screen (61), the square screen (61) being arranged in the conveying frame (3), the top of the square screen (61) being fixedly connected to the bottom of the crushing cylinder (4), and the bottom of the square screen (61) being fixedly connected to the reaction box (2), the outside of the square screen (61) being provided with a square scraper (62), the square scraper (62) being slidably arranged between the conveying frame (3) and the square screen (61), and scraping hairs being arranged on the inner side of the square scraper (62), one end of the square scraper (62) being fixedly mounted with a fixed shaft (63), one end of the conveying frame (3) being provided with a slide groove (64), and one end of the fixed shaft (63) passing through the slide groove (64) and being slidably matched with the slide groove (64).

4. A heat treatment device according to claim 3, characterized in that: The transmission assembly (7) comprises a transmission shaft (71), the transmission shaft (71) being rotatably mounted on one end of the conveying frame (3), an incomplete gear (72) being coaxially fixedly mounted on one end of the transmission shaft (71) close to the conveying frame (3), a T-shaped rod (73) being fixedly mounted on one side of the fixed shaft (63), the T-shaped rod (73) being slidably connected to one end of the conveying frame (3), and a rack (74) being fixedly mounted on one side of the T-shaped rod (73), the rack (74) being meshed with the incomplete gear (72) when in contact, a fixing plate (75) being further disposed at one end of the conveying frame (3), a return spring (76) being connected between the fixing plate (75) and the T-shaped rod (73), and an end of the transmission shaft (71) being away from the conveying frame (3) being connected to one end of the first rotating shaft (51) via a transmission belt.

5. A heat treatment device according to claim 1, characterized in that: The screening assembly (8) comprises a third rotating shaft (81) and a fourth rotating shaft (82), the third rotating shaft (81) and the fourth rotating shaft (82) being symmetrically arranged about the middle of the reaction box (2), and one end of each of the third rotating shaft (81) and the fourth rotating shaft (82) passes through the reaction box (2) and is rotationally connected to the reaction box (2), and a motor frame is fixedly mounted on one end of the reaction box (2), a second motor (83) is fixedly mounted on the motor frame, an output end of the second motor (83) is fixedly connected to one end of the third rotating shaft (81), a third gear (84) is coaxially fixedly mounted on the third rotating shaft (81), a fourth gear (85) is coaxially fixedly mounted on the fourth rotating shaft (82), and the third gear (84) is meshed with the fourth gear (85).

6. A heat treatment device according to claim 5, characterized in that: A first sieve plate (86) is fixedly mounted on the third rotating shaft (81), and a second sieve plate (87) is fixedly mounted on the fourth rotating shaft (82); the first sieve plate (86) and the second sieve plate (87) are capable of fitting against the inner wall of the reaction box (2) when kept in a horizontal state.

7. A heat treatment device according to claim 6, characterized in that: A trapezoidal baffle (88) is fixedly mounted on one side of the second screen plate (87).

8. A heat treatment device according to claim 1, characterized in that: The top of the reaction box (2) is connected to a liquid inlet pipe (11), the bottom of the reaction box (2) is connected to a liquid outlet pipe (12), both the liquid inlet pipe (11) and the liquid outlet pipe (12) are provided with one-way liquid inlet valves, one end of the bottom of the reaction box (2) is connected to an air inlet pipe (13), the other end of the bottom of the reaction box (2) is connected to a discharge pipe (14), the air inlet pipe (13) is provided with a one-way air inlet valve, and the discharge pipe (14) is provided with a one-way feed valve.

9. A heat treatment device according to claim 8, characterized in that: A heating box (16) is provided at the bottom of the work frame (1), the top of the heating box (16) is connected to the discharge pipe (14), one end of the heating box (16) is connected to a cooling box (17) via a feed pipe, a preheating sleeve (15) is also provided on the discharge pipe (14), and a ventilation pipe (18) for balancing the air pressure in the heating box (16) is also provided on the heating box (16).

10. A precious metal recovery device, characterized in that: The heat treatment device comprises the heat treatment device according to any one of claims 1 to 9, further comprising a feed funnel (9), wherein the feed funnel (9) is fixedly mounted at the top opening of the pulverizing cylinder (4).

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