A kind of waste circuit board and copper-clad plate offcut recovery metal copper crushing device and its use method

Abstract

This invention discloses a crushing device and its method for recycling metallic copper from waste circuit boards and copper-clad laminate scraps. The device includes a housing with a conveying device installed on one side inside and a crushing mechanism on the other side. It also includes a cooling mechanism located at the upper part of the housing, consisting of a fan and an evaporator, with the fan installed inside the housing; a primary crushing chamber located above the crushing mechanism, with crushing rollers rotatably mounted on both sides of the primary crushing chamber, and a transmission gear fixed to one end of the crushing roller shaft; and a secondary crushing chamber located below the primary crushing chamber, with a crushing and pressing plate inside the primary crushing chamber. The inclined surface of one side of the crushing and pressing plate and the lower wall of the primary crushing chamber are both equipped with grinding teeth. This design solves the problem of copper scrap softening and becoming difficult to crush due to excessively high internal temperatures caused by prolonged use.

Description

Technical Field

[0001] This invention relates to the field of copper recycling and crushing technology, specifically to a crushing device and its method for recycling copper from waste circuit boards and copper-clad laminate scraps. Background Technology

[0002] With the rapid development of the electronics industry, the amount of electronic waste has surged, causing serious environmental pollution. To reduce the environmental harm caused by electronic waste, recycling is essential, and recovering metallic copper from scrap circuit boards and copper-clad laminates is a crucial step. With the rapid development of the electronics industry and increased public awareness of environmental protection, the market demand for recycled metallic copper from scrap circuit boards and copper-clad laminates is constantly increasing. Recycled metallic copper can be reused in the manufacture of electronic products, reducing the need for mining and processing new copper resources, while also lowering production costs and improving corporate economic efficiency. With continuous technological advancements, the technology for recycling metallic copper from scrap circuit boards and copper-clad laminates has gradually matured. Currently, mechanical methods are generally used for copper recycling.

[0003] For example, Chinese patent application CN114558650A, entitled "A Crushing and Recycling Device for Copper Clad Laminate Scrap," includes a main body of equipment. The main body includes: a crushing assembly for crushing copper clad laminate scrap, with crushing parts installed inside the crushing assembly; and a sorting and recycling assembly for sorting and recycling the material after crushing by the crushing assembly, with telescopic parts installed inside the sorting and recycling assembly for controlling the up-and-down movement of the crushing parts. By setting up the main body of equipment, the user can control the operation of the telescopic parts. The drive cylinder drives the telescopic rod to extend, causing the fine adjustment parts, mounting frame, and the crushing parts to move upward as a whole. The active crushing roller and the driven crushing roller move to the outside and above the crushing box, making it convenient for the user to clean the fine crushed material adhering to the outside of the active crushing roller and the driven crushing roller, ensuring the normal subsequent use of the active crushing roller and the driven crushing roller.

[0004] While the existing technology can crush waste circuit boards and copper-clad laminate scraps, the overall temperature of the crushing rollers becomes high due to intense friction after prolonged use. During the crushing process, the high temperature causes copper to soften, making it more brittle and difficult to crush. Furthermore, the plastics and resins inside the waste circuit boards are prone to melting due to the high temperature, which affects the crushing mechanism. Therefore, it does not meet the current requirements. To address this, we propose a crushing device and its usage method for recycling metallic copper from waste circuit board and copper-clad laminate scraps. Summary of the Invention

[0005] The purpose of this invention is to provide a crushing device and its method for recycling metallic copper from waste circuit boards and copper-clad laminate scraps, in order to solve the problem mentioned in the background art where the copper waste softens and becomes difficult to crush due to excessively high internal temperature caused by prolonged use of the crushing device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps, comprising a housing, a conveying device installed on one side inside the housing, and a crushing mechanism disposed on the other side inside the housing, with the discharge end of the conveying device located above the crushing mechanism; further comprising:

[0007] A cooling mechanism is located at the upper end inside the housing. The cooling mechanism consists of a fan and an evaporator. The fan is installed inside the housing, and the evaporator is fixed below the fan.

[0008] A primary crushing chamber is located above the interior of the crushing mechanism. Crushing rollers are rotatably installed on both sides inside the primary crushing chamber. A transmission gear is fixedly installed at one end of the shaft of each crushing roller, and the transmission gears are meshed together.

[0009] A secondary crushing chamber is located below the primary crushing chamber. The primary crushing chamber is equipped with a crushing and pressing plate. The inclined surface of one side of the crushing and pressing plate and the lower wall of the primary crushing chamber are both equipped with grinding teeth. A sliding rod is fixedly installed on the other side of the crushing and pressing plate. The sliding rod extends to the outside of the crushing mechanism and is slidably limited with the crushing mechanism.

[0010] Preferably, a drive motor is fixedly installed on one side of the crushing mechanism, a drive gear is fixedly installed on the output shaft of the drive motor, and the drive gear is meshed with a transmission gear. A transmission wheel is fixedly installed at the front end of the drive gear through a connecting shaft. A rotating seat is fixedly installed below the other side of the crushing mechanism. A turntable is rotatably installed at the front end of the rotating seat. A connecting rod is rotatably installed at the front end of the turntable, and the other end of the connecting rod is connected to a sliding rod through a rotating shaft. A driven wheel is provided at the rear end of the turntable, and the driven wheel is connected to the transmission wheel through a belt.

[0011] Preferably, the support plate on which the crushing and extrusion plate is located is provided with a guide groove, and a guide block is fixedly provided at the bottom of the crushing and extrusion plate, and the guide block slides and limits the guide groove.

[0012] Preferably, a heat dissipation device is provided on one side of the bottom of the outer casing. The heat dissipation device includes a compressor. A condenser is provided on one side of the compressor and is fixed to the outer casing. A throttling valve is provided on one side of the condenser. The evaporator, compressor, condenser and throttling valve are connected by a medium delivery pipe.

[0013] Preferably, a dustproof net is installed on the outside of the heat dissipation device, and the dustproof net is fixed to the outer shell by screws.

[0014] Preferably, a dust collection box is provided below the other side of the crushing mechanism, a negative pressure fan is fixedly installed on one side of the dust collection box, a dust suction pipe is connected to the upper end of the dust collection box, and the branch pipes on the side of the dust suction pipe extend into the interior of the primary crushing chamber and the secondary crushing chamber respectively.

[0015] Preferably, the bottom of the dust collection box is provided with pure water, and the air inlet of the negative pressure fan is located above the pure water.

[0016] Preferably, a flotation reagent is provided in the inner cavity at the bottom of the crushing mechanism, and the flotation reagent is sodium sulfide.

[0017] The method of using a crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps includes the following steps:

[0018] Step 1: Place the waste circuit boards and copper-clad laminate scraps on one side of the conveying device. During the conveying process, the waste circuit boards and copper-clad laminate scraps are fed into the interior of the housing and move towards the feed inlet of the crushing mechanism.

[0019] Step 2: Turn on the compressor. The refrigerant is compressed in the compressor. The compressed refrigerant enters the condenser. The condensed refrigerant is throttled through the expansion valve and enters the evaporator. The evaporated refrigerant is drawn in by the compressor, and its pressure and temperature decrease, thereby cooling the surrounding air. In conjunction with the blower fan, the low-temperature air is transferred to the surface of the waste circuit board and copper-clad laminate scraps, causing their temperature to decrease.

[0020] Step 3: Waste circuit boards and copper-clad laminate scraps first enter the primary crushing chamber. The output shaft of the drive motor drives the drive gear to rotate, which in turn drives the two transmission gears to rotate in opposite directions. This drives the crushing rollers to rotate, and the waste circuit boards and copper-clad laminate scraps that enter between the crushing rollers are crushed by the crushing teeth.

[0021] Step 4: Then it enters the secondary crushing chamber below. While the drive gear rotates, it will drive the transmission wheel to rotate. Under the transmission of the belt, the turntable will rotate. While the connecting rod moves, the sliding rod will drive the crushing and pressing plate to reciprocate. Each time it separates from the secondary crushing chamber, the crushed waste can fall on the inclined surface. When the crushing and pressing plate extends here, it can easily contact the upper wall of the secondary crushing chamber. Under the friction with the grinding teeth, the crushing of the waste is further refined.

[0022] Step 5: The crushed waste material is fed into the flotation reagent for flotation.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. This invention utilizes a shell to enclose the conveying device and crushing mechanism in a relatively closed environment. Waste circuit boards and copper-clad laminate scraps enter the shell from one side of the conveying device. At this time, the refrigerant is compressed in the compressor, and the pressure and temperature rise simultaneously. The compressed refrigerant enters the condenser, where it releases heat and condenses into a liquid state. The condensed refrigerant is then throttled through a throttling valve, reducing its pressure and temperature. The throttled refrigerant enters the evaporator, where it absorbs heat and evaporates into a gaseous state. The evaporated refrigerant is then drawn into the compressor, where its pressure and temperature decrease, thereby cooling the surrounding air. In conjunction with a blower fan, the low-temperature air is delivered to the surface of the waste circuit boards and copper-clad laminate scraps. On the one hand, when the copper material is cooled, its molecular structure rearranges, making it more compact and harder. This change causes the copper material to become more brittle and easier to break into small pieces, thus facilitating crushing and recycling. On the other hand, because the overall temperature of the waste circuit boards is low, the internal plastics and resins will not easily melt due to high temperatures during the crushing process, thus avoiding any impact on the crushing mechanism.

[0025] 2. This invention features a linked crushing mechanism. Waste circuit boards and copper-clad laminate scraps preferentially enter the primary crushing chamber. The output shaft of the drive motor drives the drive gear to rotate, and the meshing action drives two transmission gears to rotate in opposite directions. This, in turn, drives the crushing rollers to rotate. The waste circuit boards and copper-clad laminate scraps entering between the crushing rollers are crushed by the crushing teeth and then enter the secondary crushing chamber below. The rotation of the drive gear drives the transmission wheel to rotate, and the rotation of the turntable is achieved by the transmission of the belt. Since the outer wall of the connecting rod is limited by the sliding groove on the crushing mechanism, the movement of the connecting rod drives the crushing extrusion plate to reciprocate through the sliding rod. Because one side of the crushing extrusion plate has an inclined structure, each time it separates from the secondary crushing chamber, the crushed waste can fall on this inclined surface. When the crushing extrusion plate extends here, it is easy to contact the upper wall of the secondary crushing chamber. Under the friction with the grinding teeth, the crushing of the waste is further refined, thereby improving the overall crushing effect. This linked structure not only has a good crushing effect but also effectively improves the crushing efficiency of waste circuit boards and copper-clad laminate scraps.

[0026] 3. This invention features a dust adsorption mechanism on one side of the crushing mechanism. Since a large amount of dust is generated during the crushing process, to avoid affecting the working environment, a negative pressure fan is turned on, and the branch pipes at both ends of the dust suction pipe extract the air from the primary and secondary crushing chambers, maintaining a negative pressure inside. The dust generated during the crushing process will then enter the dust collection box through the dust suction pipe. Copper powder is present in the dust, and water is placed inside the dust collection box. The copper powder will sink to the bottom of the water under gravity, while other dust will float on the surface, facilitating subsequent separation and improving the copper recovery efficiency. On the other hand, under the negative pressure, the cold air in the outer shell will be continuously adsorbed into the crushing mechanism, thereby removing the heat generated by the friction between the crushing roller and the crushing extrusion plate. Attached Figure Description

[0027] Figure 1 This is a perspective view of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0029] Figure 3 This is a perspective view of the crushing and extrusion plate transmission structure of the present invention;

[0030] Figure 4 This is an internal side view of the crushing mechanism of the present invention;

[0031] Figure 5 For the present invention Figure 2 Enlarged view of a portion of region A in the middle.

[0032] In the diagram: 1. Outer shell; 2. Conveying device; 3. Fan; 4. Dustproof net; 5. Crushing mechanism; 6. Primary crushing chamber; 7. Crushing roller; 8. Secondary crushing chamber; 9. Crushing extrusion plate; 10. Guide block; 11. Guide groove; 12. Slide rod; 13. Connecting rod; 14. Turntable; 15. Transmission wheel; 16. Belt; 17. Evaporator; 18. Flotation reagent; 19. Transmission gear; 20. Drive gear; 21. Grinding gear; 22. Drive motor; 23. Dust collection box; 24. Negative pressure fan; 25. Suction pipe; 26. Compressor; 27. Condenser; 28. Expansion valve; 29. ​​Medium conveying pipe. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Please see Figure 1-5One embodiment of the present invention provides a crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps, comprising a housing 1, a conveying device 2 installed on one side inside the housing 1, and a crushing mechanism 5 disposed on the other side inside the housing 1, with the discharge end of the conveying device 2 located above the crushing mechanism 5; further comprising:

[0035] The cooling mechanism is located at the upper end inside the housing 1. The cooling mechanism consists of a fan 3 and an evaporator 17. The fan 3 is installed inside the housing 1, and the evaporator 17 is fixed below the fan 3.

[0036] The primary crushing chamber 6 is located above the inside of the crushing mechanism 5. Crushing rollers 7 are rotatably installed on both sides inside the primary crushing chamber 6. A transmission gear 19 is fixedly installed at one end of the shaft of each crushing roller 7, and the transmission gears 19 are meshed and connected to each other.

[0037] The secondary crushing chamber 8 is located below the primary crushing chamber 6. The primary crushing chamber 6 is equipped with a crushing and pressing plate 9. The inclined surface of one side of the crushing and pressing plate 9 and the lower wall of the primary crushing chamber 6 are both equipped with grinding teeth 21. A sliding rod 12 is fixedly installed on the other side of the crushing and pressing plate 9. The sliding rod 12 extends to the outside of the crushing mechanism 5 and slides and is limited to the crushing mechanism 5.

[0038] During use, low-temperature air is delivered to the surface of waste circuit boards and copper-clad laminate scraps. On the one hand, when the copper material is cooled, its molecular structure rearranges, making it denser and harder. This change causes the copper material to become more brittle and easier to break into small pieces, thus facilitating crushing and recycling. On the other hand, because the overall temperature of the waste circuit board is low, the internal plastics and resins will not easily melt due to high temperatures during the crushing process, thus avoiding any impact on the crushing mechanism.

[0039] Please see Figure 2 , Figure 3 and Figure 4 A drive motor 22 is fixedly installed on one side of the crushing mechanism 5. A drive gear 20 is fixedly installed on the output shaft of the drive motor 22, and the drive gear 20 is meshed with the transmission gear 19. A transmission wheel 15 is fixedly installed at the front end of the drive gear 20 through a connecting shaft. A rotating seat is fixedly installed below the other side of the crushing mechanism 5. A turntable 14 is rotatably installed at the front end of the rotating seat. A connecting rod 13 is rotatably installed at the front end of the turntable 14, and the other end of the connecting rod 13 is connected to the slide rod 12 through a rotating shaft. A driven wheel is provided at the rear end of the turntable 14, and the driven wheel is connected to the transmission wheel 15 through a belt 16. This linkage structure can simultaneously realize the rotation of the crushing roller 7 and the reciprocating motion of the crushing extrusion plate 9, which not only has a good crushing effect, but also effectively improves the crushing efficiency of waste circuit boards and copper-clad laminate scraps.

[0040] Please see Figure 2A guide groove 11 is provided on the support plate on which the crushing and extrusion plate 9 is located, and a guide block 10 is fixedly provided at the bottom of the crushing and extrusion plate 9. The guide block 10 slides and limits the guide groove 11, thereby improving the stability of the crushing and extrusion plate 9 during movement.

[0041] Please see Figure 2 and Figure 5 A heat dissipation device is provided on one side of the bottom of the outer casing 1. The heat dissipation device includes a compressor 26. A condenser 27 is provided on one side of the compressor 26 and is fixed to the outer casing 1. A throttling valve 28 is provided on one side of the condenser 27. The evaporator 17, compressor 26, condenser 27 and throttling valve 28 are connected by a medium delivery pipe 29. The evaporator 17 is used to cool the air inside the outer casing 1, and the condenser 27 is used to dissipate the heat of the refrigerant.

[0042] Please see Figure 2 The heat dissipation device is equipped with a dustproof mesh 4 on its exterior, and the dustproof mesh 4 is fixed to the outer casing 1 with screws to prevent dust from entering its interior.

[0043] Please see Figure 4 A dust collection box 23 is provided on the lower side of the other side of the crushing mechanism 5. A negative pressure fan 24 is fixedly installed on one side of the dust collection box 23. A suction pipe 25 is connected to the upper end of the dust collection box 23, and the branch pipes on the side of the suction pipe 25 extend into the interior of the primary crushing chamber 6 and the secondary crushing chamber 8 respectively. By turning on the negative pressure fan 24, the branch pipes at both ends of the suction pipe 25 draw out the air inside the primary crushing chamber 6 and the secondary crushing chamber 8 respectively, so that the interior is kept under negative pressure. Then the dust generated by the crushing process will enter the interior of the dust collection box along the suction pipe 25.

[0044] Please see Figure 4 The bottom of the dust collection box 23 is filled with pure water, and the air inlet of the negative pressure fan 24 is located above the pure water. Copper powder will sink to the bottom of the water under gravity, while other dust will float on the water surface, which facilitates subsequent separation.

[0045] Please see Figure 2 The inner cavity at the bottom of the crushing mechanism 5 is equipped with flotation reagent 18, which is sodium sulfide. Sodium sulfide reacts chemically with copper to generate hydrophobic copper sulfide, which can form a good interfacial tension with water. Sodium sulfide can also react with copper to generate cuprous sulfide. Both copper sulfide and cuprous sulfide generated by these reactions are hydrophobic and can form a good interfacial tension with water, so that the copper material can be floated out.

[0046] The method of using a crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps includes the following steps:

[0047] Step 1: Place the waste circuit boards and copper-clad laminate scraps on one side of the conveying device 2. During the conveying process, the waste circuit boards and copper-clad laminate scraps are fed into the interior of the outer casing 1 and move towards the feed inlet of the crushing mechanism 5.

[0048] Step 2: Start the compressor 26. The refrigerant is compressed in the compressor and enters the condenser 27. The condensed refrigerant is throttled through the throttle valve 28 and enters the evaporator 17. The evaporated refrigerant is drawn in by the compressor 26, and the pressure and temperature are reduced, thereby cooling the surrounding air. In conjunction with the blower fan 3, the low-temperature air is transferred to the surface of the waste circuit board and copper-clad laminate scraps, causing their temperature to drop.

[0049] Step 3: Waste circuit boards and copper-clad laminate scraps first enter the primary crushing chamber 6. The output shaft of the drive motor 22 drives the drive gear 20 to rotate, which in turn drives the two transmission gears 19 to rotate in opposite directions. Thus, the transmission gears 19 drive the crushing roller 7 to rotate. The waste circuit boards and copper-clad laminate scraps entering between the crushing rollers 7 will be crushed by the crushing teeth.

[0050] Step 4: Then, it enters the secondary crushing chamber 8 below. While the drive gear 20 rotates, it will drive the transmission wheel 15 to rotate. Under the transmission action of the belt 16, the turntable 14 will rotate. While the connecting rod 13 moves, the sliding rod 12 will drive the crushing and pressing plate 9 to perform telescopic reciprocating motion. Each time it separates from the secondary crushing chamber 8, the crushed waste can fall on the inclined surface. When the crushing and pressing plate 9 extends here, it is easy to contact the upper wall of the secondary crushing chamber 8. Under the friction with the grinding teeth, the crushing of the waste is further refined.

[0051] Step 5: The crushed waste material is fed into flotation reagent 18 for flotation.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A crushing device for recycling metallic copper from scraps of waste circuit boards and copper-clad laminates, comprising a housing (1), a conveying device (2) installed on one side inside the housing (1), and a crushing mechanism (5) provided on the other side inside the housing (1), wherein the discharge end of the conveying device (2) is located above the crushing mechanism (5); Its features are: Also includes: A cooling mechanism is provided at the upper end inside the housing (1). The cooling mechanism consists of a fan (3) and an evaporator (17). The fan (3) is installed inside the housing (1), and the evaporator (17) is fixed below the fan (3). A primary crushing chamber (6) is located above the inside of the crushing mechanism (5). Crushing rollers (7) are rotatably installed on both sides inside the primary crushing chamber (6). A transmission gear (19) is fixedly installed at one end of the shaft of each crushing roller (7), and the transmission gears (19) are meshed together. A secondary crushing chamber (8) is located below the primary crushing chamber (6). The primary crushing chamber (6) is equipped with a crushing and pressing plate (9). The inclined surface on one side of the crushing and pressing plate (9) and the lower wall of the primary crushing chamber (6) are both equipped with grinding teeth (21). A sliding rod (12) is fixedly installed on the other side of the crushing and pressing plate (9). The sliding rod (12) extends to the outside of the crushing mechanism (5), and the sliding rod (12) slides and is limited to the crushing mechanism (5). A drive motor (22) is fixedly installed on one side of the crushing mechanism (5). A drive gear (20) is fixedly installed on the output shaft of the drive motor (22). The drive gear (20) meshes with the transmission gear (19). A transmission wheel (15) is fixedly installed at the front end of the drive gear (20) through a connecting shaft. A rotating seat is fixedly installed below the other side of the crushing mechanism (5). A turntable (14) is rotatably installed at the front end of the rotating seat. A connecting rod (13) is rotatably installed at the front end of the turntable (14). The other end of the connecting rod (13) is connected to the slide rod (12) through a rotating shaft. A driven wheel is provided at the rear end of the turntable (14). The driven wheel is connected to the transmission wheel (15) through a belt (16). A heat dissipation device is provided on one side of the bottom of the outer casing (1). The heat dissipation device includes a compressor (26). A condenser (27) is provided on one side of the compressor (26), and the condenser (27) is fixed to the outer casing (1). A throttle valve (28) is provided on one side of the condenser (27), and the evaporator (17), compressor (26), condenser (27) and throttle valve (28) are connected by a medium conveying pipe (29).

2. The crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps according to claim 1, characterized in that: The support plate on which the crushing and pressing plate (9) is located is provided with a guide groove (11), and a guide block (10) is fixedly provided at the bottom of the crushing and pressing plate (9), and the guide block (10) and the guide groove (11) are slidably limited.

3. The crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps according to claim 1, characterized in that: The heat dissipation device is equipped with a dustproof net (4) on its exterior, and the dustproof net (4) is fixed to the outer shell (1) by screws.

4. The crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps according to claim 1, characterized in that: A dust collection box (23) is provided below the other side of the crushing mechanism (5). A negative pressure fan (24) is fixedly installed on one side of the dust collection box (23). A suction pipe (25) is connected to the upper end of the dust collection box (23), and the branch pipes on the side of the suction pipe (25) extend into the interior of the primary crushing chamber (6) and the secondary crushing chamber (8), respectively.

5. The crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps according to claim 4, characterized in that: The bottom of the dust collection box (23) is filled with pure water, and the air inlet of the negative pressure fan (24) is located above the pure water.

6. The crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps according to claim 1, characterized in that: The inner cavity at the bottom of the crushing mechanism (5) is provided with flotation reagent (18), and the flotation reagent (18) is sodium sulfide.

7. The method of using the crushing device for recycling metallic copper from waste circuit boards and copper-clad laminate scraps as described in claim 1, characterized in that: Includes the following steps: Step 1: Place the waste circuit boards and copper-clad laminate scraps on one side of the conveying device (2). During the conveying operation, the waste circuit boards and copper-clad laminate scraps are fed into the interior of the outer shell (1) and moved towards the feed port of the crushing mechanism (5). Step 2: Turn on the compressor (26). The refrigerant is compressed in the compressor and enters the condenser (27). The condensed refrigerant is throttled through the throttle valve (28) and enters the evaporator (17). The evaporated refrigerant is drawn in by the compressor (26), and the pressure and temperature are reduced, thereby cooling the surrounding air. In conjunction with the blower fan (3), the low temperature air is transferred to the surface of the waste circuit board and copper-clad laminate scraps, causing their temperature to drop. Step 3: Waste circuit boards and copper-clad laminate scraps are preferentially fed into the primary crushing chamber (6). The output shaft of the drive motor (22) drives the drive gear (20) to rotate, which drives the two transmission gears (19) to rotate in opposite directions. Thus, the transmission gears (19) drive the crushing roller (7) to rotate. The waste circuit boards and copper-clad laminate scraps that enter between the crushing rollers (7) will be crushed by the crushing teeth. Step 4: Then, it enters the secondary crushing chamber (8) below. While the drive gear (20) rotates, it will drive the transmission wheel (15) to rotate. Under the transmission action of the belt (16), the turntable (14) will rotate. While the connecting rod (13) moves, the sliding rod (12) drives the crushing extrusion plate (9) to perform telescopic reciprocating motion. Each time it separates from the secondary crushing chamber (8), the crushed waste can fall on the inclined surface. When the crushing extrusion plate (9) extends here, it is easy to contact the upper wall of the secondary crushing chamber (8). Under the friction with the grinding teeth, the crushing of the waste is further refined. Step 5: The crushed waste material is fed into the flotation reagent (18) for flotation.

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