A step-by-step precious metal melting recovery equipment

Abstract

The present invention relates to the technical field of precious metal recovery, and specifically discloses a step-by-step precious metal melting recovery equipment, comprising an upper box body and a lower box body which are connected up and down, wherein a closed-loop conveying assembly is arranged in the upper box body, and a discharging conveying belt assembly is arranged in the lower box body, and a plurality of crucible assemblies are arranged at equal intervals on the closed-loop conveying assembly, and a feeding device, an induction coil heating device and a cooling device are arranged on the upper box body from left to right in sequence; the step-by-step precious metal melting recovery equipment disclosed in the invention can realize the whole process of automatic feeding, heating and melting, cooling and solidification, and automatic unloading, which greatly improves the processing efficiency in the precious metal recovery process, and through the special design of the crucible assembly, and at the same time cooperates with the functions of the long strip block, the guide groove and the baffle plate, the molten crucible can be made to collide with the baffle plate for multiple times, and then the precious metal blocks adhering to the crucible are made to fall off due to the impact, thereby realizing automatic unloading.

Description

Technical Field

[0001] The invention relates to the technical field of precious metal recovery, and specifically discloses a step-by-step precious metal melting recovery device. Background Art

[0002] In the process of precious metal recovery, the melting method and chemical agent extraction method are mainly used. The chemical agent extraction method not only consumes a large amount of agents, but also produces wastewater that is difficult to treat. The melting method is to add crushed materials such as circuit boards and waste precious metal catalytic carriers into a crucible, melt them at high temperature, and vaporize and volatilize non-metallic substances during the melting process. However, when the existing crucible equipment is used for precious metal recovery and melting, it not only requires operators to load the materials, but also needs to transfer them to the crucible container for cooling after melting, resulting in a large number of spare crucible containers. In addition, after the precious metals are cooled and solidified, they are easy to adhere to the inner wall of the crucible container, and operators need to use tools to remove them from the crucible container. The whole process is labor-intensive and has low operating efficiency.

[0003] For example, the utility model patent with application number 2023216754747 discloses an induction melting furnace capable of driving a crucible to rotate, including an induction heating module and a crucible. The induction heating module includes an electromagnetic induction heating power supply and an induction coil. The induction coil surrounds the outside of the crucible. A first motor for driving the crucible to rotate is provided at the lower end of the crucible. When in use, the crucible and the gold (or other metal) inside are heated by the induction coil. During the heating process, the first motor drives the crucible to alternately rotate forward and reverse at a certain frequency, so that the gold (or other metal) inside the crucible can be driven to rotate forward and reverse, so as to achieve the purpose of shaking the internal gold (or other metal) and ensure the melting efficiency of the gold (or other metal). Although the induction furnace disclosed in the patent can be used for heating and melting in the process of precious metal recovery, only a certain amount of crushed materials can be processed manually each time, resulting in low production efficiency; in addition, after the crucible melts the precious metal, it needs to be directly introduced into the container for cooling, and the precious metal cannot be directly taken out after cooling and solidification, which causes the fixed precious metal in the container to adhere to the inside during the subsequent use process, making it difficult to take out the material. Based on this, the present application proposes a step-by-step precious metal melting and recovery equipment to solve the shortcomings of the existing induction furnace in the process of precious metal melting and recovery. Summary of the invention

[0004] The purpose of the present invention is to provide a step-by-step precious metal melting and recovery equipment to achieve assembly-line efficient processing in the precious metal melting and recovery process, and to solve the deficiency that the molten precious metal needs to be placed in the crucible container for cooling and solidification recovery in the traditional crucible.

[0005] The present invention is achieved through the following technical solutions:

[0006] A step-by-step precious metal melting recovery device comprises an upper box body and a lower box body which are connected to each other from top to bottom, a closed-loop conveying assembly is arranged in the upper box body, a discharging conveying belt assembly is arranged in the lower box body, a plurality of crucible assemblies are arranged at equal intervals on the closed-loop conveying assembly, and a feeding device, an induction coil heating device and a cooling device are arranged on the upper box body from left to right in sequence;

[0007] The crucible assembly comprises a carrier plate connected to the closed-loop conveying assembly, a mounting plate is connected to the carrier plate via a guide rod and a spring, a melting crucible is fixedly arranged on the mounting plate, the lower end of the melting crucible passes through the carrier plate, and guide wheels are arranged at both the front and rear ends of the mounting plate;

[0008] Long strips are fixed on the front and rear inner walls of the upper box body located below the closed-loop conveying assembly, and guide grooves that interact with the guide wheels are opened on the opposite sides of the two long strips, and the guide grooves include multiple groups of straight segments and raised segments connected end to end in sequence, and a baffle protruding in the direction of the central axis of the upper box body is fixed at the lower end of the long strips.

[0009] During the operation of the step-by-step precious metal melting and recovery equipment disclosed in the present invention, the closed-loop conveying assembly sequentially conveys the crucible assembly to the bottom of the feeding device, the induction coil heating device and the cooling device one by one. When the melting crucible moves to the bottom of the feeding device, the feeding device automatically feeds the material; after the feeding is completed, it moves to the top of the induction coil heating device, and then the induction coil heating device moves upward and is inserted into the outer periphery of the lower end of the melting crucible, and then current is passed through the induction coil heating device to heat and melt the material in the melting crucible; after the melting is completed, it moves to the bottom of the cooling device, and then the cooling device is moved upward, so that the lower end of the melting crucible is immersed in cooling water for rapid cooling, until the molten precious metal solidifies and agglomerates.

[0010] After the precious metal inside the melting crucible solidifies and agglomerates, it will be flipped 180° along with the closed-loop conveying assembly during the subsequent movement process, so that the opening of the melting crucible faces downward. Then, as the closed-loop conveying assembly continues to convey, the crucible assembly will move between the front and rear long strips, and the guide wheel on the crucible assembly will enter the guide groove. After entering the guide groove, the guide wheel will first move horizontally along the straight section, and then after entering the raised section, it will first slowly lift upward and compress the spring, and then instantly fall rapidly under the action of the spring and its own gravity, so that the melting crucible can hit the baffle. After repeating the above-mentioned impact several times, the melting crucible can smoothly shake off the cooled precious metal blocks in the melting crucible, realizing the unloading process. Finally, the precious metal blocks that are shaken off will fall onto the discharge conveyor belt assembly, and then the discharge conveyor belt assembly will send them out of the entire equipment.

[0011] As a further arrangement of the above scheme, the raised section in the guide groove is designed in a horizontal 7-shape; the design of the 7-shaped raised section in the guide groove enables the guide wheel to instantly release the elastic potential energy and the weight potential energy of the molten crucible after moving to the upper corner position, so that the molten crucible can quickly hit the baffle, thereby ensuring that the cooled precious metal blocks in the molten crucible can be shaken off smoothly.

[0012] As a further configuration of the above scheme, the closed-loop conveying assembly includes closed-loop conveying members arranged in parallel in front and back, both ends of the closed-loop conveying member are provided with conveying wheel groups, and the end of one of the conveying wheel groups is connected to the first motor, and the plurality of carrier plates are fixedly connected to the two closed-loop conveying members at equal intervals. The above-mentioned specific closed-loop conveying member can be one of a transmission chain or a transmission belt.

[0013] As a further configuration of the above scheme, the feeding device includes a conveying cylinder arranged above the upper box body, a feeding pipe is arranged on the lower surface of one end of the conveying cylinder, and a material bin is connected to the upper surface of the other end, an auger blade is arranged inside the conveying cylinder, and an auger motor is connected to the end of the auger blade. The design of the above feeding device can not only realize the automatic feeding of materials, but also realize the quantitative feeding by controlling the number of rotations of the auger motor.

[0014] As a further configuration of the above scheme, the induction coil heating device includes a coil frame and a first telescopic driving member for driving the coil frame to move up and down, and the coil frame is provided with an induction heating coil. Under the action of the first telescopic driving member, the induction heating coil can be moved up and down, so that the induction heating coil can be smoothly inserted into the lower half of the melting crucible at the heating station, thereby heating and melting the material inside the crucible.

[0015] As a further configuration of the above scheme, the cooling device includes a support ring and a second telescopic drive member that drives the support ring to move up and down, the support ring is provided with a cooling cylinder with an upper end opening, the lower end of the cooling cylinder is connected to a three-way control valve through a telescopic tube, the two ends of the three-way control valve are connected to a drain pipe and a water injection pipe, the drain pipe and the water injection pipe are both extended out of the upper box body, and the end of the water injection pipe is connected to an infusion pump. The design of the above cooling device is that when the high-temperature crucible moves to the top of the cooling cylinder, the water injection pipeline is first opened through the three-way control valve, and then a certain amount of cooling water is added to the cooling cylinder by the infusion pump, and then the cooling cylinder is pushed upward by the second telescopic drive member, so that the lower half of the high-temperature crucible enters the cooling water to achieve rapid cooling of itself and the molten metal inside, and after the cooling is completed, the cooling cylinder is moved downward to separate it from the molten crucible, and after separation, the drainage pipeline is opened to discharge the remaining cooling water in time.

[0016] As a further configuration of the above scheme, a detection device for detecting the inside of the melting crucible is arranged above the upper box body on the left side of the feeding device, and the detection device is electrically connected to the control box. The above detection device can detect the internal situation of the melting crucible before feeding, and when the precious metal block inside is found, the operation of the entire equipment can be directly suspended, and the material inside the crucible can be manually taken out before continuing to operate.

[0017] As a further configuration of the above scheme, the melting crucible is detachably fixedly connected to the mounting plate, an annular groove is provided on the upper end of the outer circumferential surface of the melting crucible, and an adjusting screw is threadedly connected to the front and rear ends of the mounting plate, and an arc-shaped clamping plate matching the annular groove is connected to the end of the adjusting screw. The melting crucible is detachably connected to the mounting plate, and when it is detected that the precious metal block inside the melting crucible is not discharged, the melting crucible can be quickly removed and replaced with a new crucible for use, ensuring the continuous operation of the entire equipment, and the material inside the removed melting crucible can be manually removed by the operator.

[0018] As a further configuration of the above scheme, a steam extraction hood is arranged directly above the cooling device, and the upper end of the steam extraction hood is connected to a suction device through a steam extraction pipe. The design of the steam extraction hood, the steam extraction pipe and the suction device can directionally extract the water vapor generated during the cooling process of the high-temperature crucible to prevent it from diffusing in the air and causing excessive humidity in the workshop.

[0019] As a further configuration of the above solution, the carrier plate and the mounting plate are both made of high temperature resistant heat insulating materials.

[0020] Compared with the prior art, the beneficial effects are as follows:

[0021] The step-by-step precious metal melting recovery equipment disclosed in the present invention can realize the whole process of automatic feeding, heating and melting, cooling and solidification, and automatic unloading, which greatly improves the processing efficiency in the precious metal recovery process.

[0022] The step-by-step precious metal melting recovery equipment disclosed in the present invention specially designs the crucible assembly, and cooperates with the functions of the long strip block, the guide groove and the baffle. During the process of the molten metal solidifying and moving and conveying along the lower end of the closed-loop conveying assembly, the molten crucible can hit the baffle multiple times, and then the precious metal blocks adhered to the crucible are fallen off due to the impact, thereby realizing automatic unloading. During the whole process, there is no need to transfer the molten material in the crucible to a specific container for cooling and recovery, which not only reduces the spare demand for specific containers, but also realizes fully automatic unloading and improves the recovery processing efficiency.

[0023] The present invention further detects the situation in the melting crucible online through a detection device. When it is found that the internal precious metal block has not been discharged, the operation of the entire device will be automatically suspended. Then the crucible can be removed and quickly replaced with a new crucible to continue to be used, thereby ensuring the continuous operation of the entire device. The removed crucible can be manually unloaded, making the entire device very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the back three-dimensional structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the internal planar structure of the present invention from a side view;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the closed-loop conveyor, carrier plate, melting crucible, etc. in the present invention;

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the carrier plate, the mounting plate, the melting crucible, etc. in the present invention;

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the induction coil heating device of the present invention;

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the cooling device in the present invention;

[0033] Fig. 9 It is a schematic diagram of the three-dimensional structure of the long strip block, the guide groove and the baffle in the present invention;

[0034] Fig.10 Schematic diagram of the assembly structure of the melting crucible and the mounting plate in Example 2 of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 10 , and describes the application in detail with reference to embodiments. Example 1

[0037] Example 1 discloses a step-by-step precious metal melting recovery device, see Attachment Figures 1 to 3 The main body of the machine comprises an upper box body 1 and a lower box body 2. The upper box body 1 is fixedly connected to the upper surface of the lower box body 2 and the two are connected. A strip opening is opened on the upper surface of the upper box body 1 along its length. Two parallel closed-loop conveying members 3 are arranged inside the upper box body 1, and a discharging conveying belt 4 is arranged in the lower box body 2.

[0038] Reference Figure 5 A plurality of carrier plates 5 are arranged at equal intervals between the two closed-loop conveyors 3. Specifically, the closed-loop conveyor 3 may be a transmission chain or a transmission belt, and the carrier plates 5 are made of high-temperature resistant heat-insulating materials, which are welded to the closed-loop conveyor 3 or fixedly connected by connecting members such as screws. Conveying wheel groups 6 are arranged at both left and right ends of the two closed-loop conveyors 3, and a first motor 7 is arranged at the end of one of the conveying wheel groups 6, so that under the power input of the first motor 7, the carrier plates 5 on the closed-loop conveyor 3 can be equidistantly moved and conveyed.

[0039] Reference Figure 6 A circular hole is provided at the center of each carrier plate 5, and a mounting plate 8 is provided just above the circular hole. A melting crucible 9 is fixedly provided on the mounting plate 8, and the lower end of the melting crucible 9 passes through the circular hole. The mounting plate 8 is also made of a high temperature resistant heat insulating material. A guide rod 10 is connected to each of the four corners of the mounting plate 8, and a guide hole matching the corresponding guide rod 10 is provided on the carrier plate 5. Then, a spring 11 is sleeved on the guide rod 10 between the carrier plate 5 and the mounting plate 8, and the upper and lower ends of the spring 11 are connected to the mounting plate 8 and the carrier plate 5, respectively. In addition, guide wheels 12 are provided at the middle positions of the front and rear sides of the mounting plate 8.

[0040] Reference Figure 3 and attached Figure 4A feeding device 13 is arranged above the left end of the upper box body 1, an induction coil heating device 14 is arranged inside the upper box body 1 on the right side of the feeding device 13, and a cooling device 15 is arranged inside the upper box body 1 on the right side of the induction coil heating device 14, and the spacing between the feeding device 13, the induction coil heating device 14 and the cooling device 15 is equal to the spacing between two adjacent carrier plates 5 on the closed-loop conveyor 3.

[0041] The specific feeding device 13 includes a conveying cylinder 131 fixedly arranged on the upper surface of the upper box body 1, a feeding pipe arranged toward the strip-shaped opening is arranged on the lower surface of one end of the conveying cylinder 131, and a material bin 132 is arranged on the upper surface of the other end. An auger blade is arranged in the conveying cylinder 131, and an auger motor 133 connected to the auger blade is arranged at the end of the conveying cylinder 131. By controlling the rotation of the auger motor 133, the material in the material bin 132 can be fed into the melting crucible 9 located at the feeding station, and the number of rotations of the auger motor can be controlled to achieve the effect of controlling the amount of material fed.

[0042] Reference Figure 7 The induction coil heating device 14 includes a coil frame 141, in which a spiral induction heating coil 142 is arranged. At the same time, one end of the coil frame 141 is extended out of the front side of the upper box body 1, and a first cylinder 143 for driving the coil frame 141 to move up and down is fixedly arranged on the upper box body 1. Of course, the first cylinder 143 can also be replaced by other telescopic driving parts such as hydraulic telescopic rods and electric push rods, so that the induction heating coil 142 can be lifted upward to the periphery of the melting crucible 9 at the heating station under the action of the first cylinder 143.

[0043] Reference Figure 8The cooling device 15 includes a cooling cylinder 151 with an upper opening, which is located directly below the melting crucible 9 at the cooling station, and its inner diameter is larger than the outer diameter of the melting crucible 9. A telescopic tube 152 is connected to the lower end of the cooling cylinder 151, a three-way control valve 153 is connected to the lower end of the telescopic tube 152, and a drainage pipe 154 and a water injection pipe 155 are connected to the other two connecting ends of the three-way control valve 153. The drainage pipe 154 extends out of the rear side of the upper box body 1, the water injection pipe 155 extends out of the front side of the upper box body 1, and an infusion pump 156 is connected to the end of the water injection pipe 155. A support ring 157 is provided at the bottom of the cooling cylinder 151, and one end of the support ring 157 also extends out of the front side of the upper box body 1, and then a second cylinder 158 for driving the cooling cylinder 151 to move up and down is fixedly provided on the upper box body 1, and the second cylinder can also be replaced by other telescopic driving parts. In addition, in this embodiment, a flow meter is provided on the water injection pipe 155 so as to control the amount of cold water injected into the cooling cylinder 151 each time, thereby avoiding adding too much cooling water, which would cause cooling water to overflow after the melting crucible 9 enters the cooling cylinder 151 .

[0044] Reference Figure 3 , Attachment Figure 4 and attached Fig. 9 On the front and rear inner walls of the upper box body 1 below the closed-loop conveyor 3, long strips 16 arranged along the conveying direction are fixedly arranged. On the opposite sides of the two long strips 16, guide grooves 17 matching the guide wheels 12 at the front and rear ends of the mounting plate 8 are provided. The guide grooves 17 include a plurality of groups of straight segments 171 connected end to end and a horizontal "7"-shaped raised segment 172, so that after the guide wheel 12 enters the guide groove 17, it first moves horizontally along the straight segment 171, and then after entering the raised segment 172, it first slowly lifts upward and compresses the spring 11, and then instantly falls under the action of the spring 11 and its own gravity. In addition, baffles 18 are fixed at the lower ends of the two long strips 16, and a portion of the baffle 18 protrudes in the direction of the central axis of the upper box body 1, so that the melting crucible 9 can hit the baffle 18 when it falls instantly, so that the precious metal block cooled in the melting crucible 9 is shaken off.

[0045] Finally, in this embodiment, a belt roller 401 is provided at each of the left and right ends of the lower box body 2, and the end of one of the belt rollers 401 is connected to a second motor 402, and the discharge conveyor belt 4 is arranged between the two belt rollers 401, so that the discharge conveyor belt 4 is driven to move under the action of the second motor 402, thereby sending the received precious metal blocks out from the open end of the lower box body 2. Example 2

[0046] Example 2 discloses a step-by-step precious metal melting recovery equipment that is optimized and improved based on the technical solution in Example 1. The similarities between it and Example 1 will not be described again.

[0047] Reference Figures 1 to 4 In this embodiment 2, a control box 19 is also provided on the front side of the upper box body 1, and a control module is provided inside the control box 19. At the same time, a bracket 20 is provided on the upper surface of the upper box body 1 on the left side of the feeding device 13. A detection device 21 is installed on the bracket 20 and is arranged toward the strip-shaped opening, and the detection device 21 is electrically connected to the control module inside the control box 19. The specific detection device 21 can be one of an industrial camera, an ultrasonic distance sensor or a laser distance sensor. Through the detection device 21, it can be detected whether there are precious metal blocks that have not been cleaned up in the melting crucible 9 before feeding. Once it is found that there are precious metal blocks in the melting crucible 9, the control box 19 directly controls the entire device to suspend operation, and sends an alarm relying on the attached alarm to remind the operator to deal with it in time.

[0048] In addition, in this embodiment 2, the melting crucible 9 and the mounting plate 8 are detachably fixed. Fig.10 In the specific design, an annular groove 901 is firstly provided on the upper end of the outer circumferential surface of the melting crucible 9, and then the front and rear ends of the mounting plate 8 are both threadedly connected with adjusting screws 801, and the inner end of each adjusting screw 801 is connected with an arc clamping plate 802 matching the annular groove 901. When it is found that there is a precious metal block in the melting crucible 9 and the machine is shut down, the operator directly releases the clamping and fixing effect of the melting crucible 9 by rotating the adjusting screw 801, takes it out, replaces it with a spare melting crucible 9, and restarts the whole equipment to make it run normally, and then the operator manually removes the precious metal block inside the melting crucible 9 after it is removed.

[0049] Finally, in the present embodiment 2, a steam extraction hood 22 is arranged just above the cooling device 15, and a suction device 24 is connected to the top of the steam extraction hood 22 through a steam extraction pipe 23. The suction device 24 can be a suction pump or a suction fan. When the cooling cylinder 151 is filled with coolant and lifted upward, so that the melting crucible 9 is loaded therein, the high temperature inside the melting crucible 9 will cause the cooling water to boil and vaporize rapidly, and the steam generated at this time can be extracted by the steam extraction hood 22 to avoid escaping into the workshop.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A step-by-step precious metal molten recovery device, characterized in that: It comprises an upper box body and a lower box body which are connected to each other from top to bottom, wherein a closed-loop conveying assembly is arranged in the upper box body, and a discharging conveying belt assembly is arranged in the lower box body, and a plurality of crucible assemblies are arranged at equal intervals on the closed-loop conveying assembly, and a feeding device, an induction coil heating device and a cooling device are arranged on the upper box body from left to right in sequence; The crucible assembly comprises a carrier plate connected to the closed-loop conveying assembly, a mounting plate is connected to the carrier plate via a guide rod and a spring, a melting crucible is fixedly arranged on the mounting plate, the lower end of the melting crucible passes through the carrier plate, and guide wheels are arranged at both the front and rear ends of the mounting plate; Long strips are fixed on the front and rear inner walls of the upper box body located below the closed-loop conveying assembly, and guide grooves that interact with the guide wheels are opened on the opposite sides of the two long strips, and the guide grooves include multiple groups of straight segments and raised segments connected end to end in sequence, and a baffle protruding in the direction of the central axis of the upper box body is fixed at the lower end of the long strips.

2. The step-by-step precious metal molten recovery equipment according to claim 1 is characterized in that: The raised section in the guide groove is designed in a horizontal 7-shape.

3. The step-by-step precious metal molten recovery equipment according to claim 1 is characterized in that: The closed-loop conveying assembly includes closed-loop conveying members arranged in parallel front and back, both ends of the closed-loop conveying member are provided with conveying wheel groups, and the end of one of the conveying wheel groups is connected to the first motor, and the plurality of carrier plates are fixedly connected to the two closed-loop conveying members at equal intervals.

4. The step-by-step precious metal molten recovery equipment according to claim 1 is characterized in that: The feeding device includes a conveying cylinder arranged above the upper box body, a feeding pipe is arranged on the lower surface of one end of the conveying cylinder, and a material bin is connected to the upper surface of the other end. An auger blade is arranged inside the conveying cylinder, and an auger motor is connected to the end of the auger blade.

5. The step-by-step precious metal molten recovery equipment according to claim 1 is characterized in that: The induction coil heating device comprises a coil frame and a first telescopic driving member for driving the coil frame to move up and down, wherein the coil frame is provided with an induction heating coil.

6. The step-by-step precious metal molten recovery equipment according to claim 1 is characterized in that: The cooling device includes a support ring and a second telescopic driving member for driving the support ring to move up and down. A cooling cylinder with an open upper end is provided on the support ring. The lower end of the cooling cylinder is connected to a three-way control valve via a telescopic tube. Both ends of the three-way control valve are connected to a drain pipe and a water injection pipe. The drain pipe and the water injection pipe are both extended out of the upper box body, and the end of the water injection pipe is connected to an infusion pump.

7. The step-by-step precious metal molten recovery equipment according to claim 1 is characterized in that: A detection device for detecting the inside of the melting crucible is arranged above the upper box body located on the left side of the feeding device, and the detection device is electrically connected to the control box.

8. The step-by-step precious metal molten recovery equipment according to claim 7, characterized in that: The melting crucible is detachably fixedly connected to the mounting plate, an annular groove is provided at the upper end of the outer circumferential surface of the melting crucible, and adjusting screws are threadedly connected at both the front and rear ends of the mounting plate, and an arc-shaped clamping plate matching the annular groove is connected to the end of the adjusting screw.

9. The step-by-step precious metal molten recovery equipment according to claim 1, characterized in that: A steam extraction hood is arranged directly above the cooling device, and the upper end of the steam extraction hood is connected with a suction device through a steam extraction pipe.

10. The step-by-step precious metal molten recovery equipment according to claim 1, characterized in that: The carrier plate and the mounting plate are both made of high temperature resistant heat insulating materials.

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