CN112827671B

CN112827671B - Method for separating and recovering drilling waste of circuit board

Info

Publication number: CN112827671B
Application number: CN202110084304.0A
Authority: CN
Inventors: 许校彬; 陈辉
Original assignee: Huizhou Techuang Electronic Technology Co ltd
Current assignee: Huizhou Techuang Electronic Technology Co ltd
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2023-03-21
Anticipated expiration: 2041-01-21
Also published as: CN112827671A; WO2022156070A1

Abstract

The invention discloses a method for separating and recovering drilling waste of a circuit board, which comprises the following steps: collecting waste generated in the drilling process of the circuit board in real time; crushing the collected waste; separating the crushed waste by primary air separation to obtain copper powder and a primary air separation separator; separating the primary air separation isolate by secondary air separation, and intermittently feeding low-temperature non-combustion-supporting gas into an air separation air channel in the secondary air separation to obtain aluminum powder and the secondary air separation isolate; and (5) separating the secondary air separation isolate by using a tertiary air separation method to obtain epoxy glass fiber powder and wood pulp powder. According to the method for separating and recovering the drilling waste of the circuit board, the low-temperature non-combustion-supporting gas is intermittently fed in the secondary winnowing separation process, the technical problem that aluminum powder is easy to contact oxygen and water in the air to cause explosion in the recovery process is solved, and the effects of resource recycling and safe resource recovery are achieved.

Description

Method for separating and recovering drilling waste of circuit board

Technical Field

The invention relates to the technical field of circuit board manufacturing, in particular to a method for separating and recycling drilling waste of a circuit board.

Background

Along with the rapid development of the electronic industry, the PCB yield and export quantity of China are the first place in the world, and the problems of resource consumption and pollution undoubtedly bring great pressure to China. At present, the demand of 5G product circuit boards is continuously vigorous. The 5G industry in China will meet the large-scale demand growth. Under the promotion of 5G wave, the world demands for Chinese circuit board products will be increasingly greater. While China is a country with a large population and scarce resources, people with 45 main mineral resources all have less than half of the average world level, and the export of PCBs with such a large size undoubtedly causes great pressure on the country. Therefore, the renewable resource recycling industry is vigorously developed and becomes an important component of the development strategy for maintaining natural resource balance in China!

However, in the face of pollution or waste in the circuit board industry, the environment bears huge pressure, and the continuous development of economy is more and more obviously restricted by resource and environment bottlenecks. The application of the technology for treating and recycling wastewater and recycling heavy metal resources in the PCB industry is relatively mature, the removal rate of copper, nickel, chromium, zinc and the like in the wastewater can reach more than 99.6%, the copper content in the recycled sludge reaches 55-60%, but the waste in the machining process is not paid enough attention, many PCB enterprises consider that the resource recycling is not the 'normal industry' of the enterprises, the waste can be treated in the contrary, and the waste in the machining process is ignored, wasted or discarded. Particularly, most enterprises often do not pay enough attention to the recycling of waste generated in the drilling process of the circuit board and perform corresponding technical upgrading and reconstruction, so that resources are wasted meaningless.

Disclosure of Invention

Therefore, it is necessary to provide a method for separating and recovering circuit board drilling waste, which aims at the technical problem of how to separate and recover the waste generated in the drilling process of the circuit board.

A method for separating and recycling drilling waste of a circuit board comprises the following steps:

collecting waste generated in the drilling process of the circuit board in real time;

crushing the collected waste;

separating the crushed waste by primary air separation to obtain copper powder and a primary air separation separator;

performing secondary air separation to separate the primary air separation isolate, and intermittently feeding low-temperature non-combustion-supporting gas into an air separation air channel in the secondary air separation to obtain aluminum powder and the secondary air separation isolate;

and performing tertiary air separation on the secondary air separation isolate to obtain epoxy glass fiber powder and wood pulp powder.

In one embodiment, the low-temperature non-combustion-supporting gas is carbon dioxide gas at 5-10 ℃.

In one embodiment, the copper powder obtained by primary air separation is subjected to secondary crushing and air separation again.

In one embodiment, the aluminum powder obtained by secondary air separation is subjected to secondary crushing and air separation again.

In one embodiment, the epoxy glass fiber powder obtained by the three-stage air separation is subjected to secondary crushing and air separation again.

In one embodiment, the wood pulp powder obtained by the three-stage air separation is subjected to secondary crushing and air separation again.

In one embodiment, the step of crushing the collected waste includes:

crushing the collected waste;

and quantitatively outputting the crushed waste.

In one embodiment, the step of separating the primary winnowing separated product by the secondary winnowing, and intermittently feeding low-temperature non-combustion-supporting gas into the winnowing air duct in the secondary winnowing separation to obtain aluminum powder and the secondary winnowing separated product, further comprises:

and feeding the obtained aluminum powder into normal-temperature non-combustion-supporting gas.

In one embodiment, the normal-temperature non-combustion-supporting gas is carbon dioxide gas with the temperature of 20-25 ℃.

In one embodiment, the step of collecting the waste generated by the drilling process of the circuit board in real time comprises the following steps:

collecting wastes of the area around the drill hole and the drill hole channel in real time in the drilling process of the circuit board;

and uniformly collecting the wastes.

According to the method for separating and recycling the drilling waste of the circuit board, the waste generated in the drilling process of the circuit board is crushed in real time, the crushed waste powder is subjected to three-stage separation such as primary air separation, secondary air separation and tertiary air separation to obtain copper powder, aluminum powder, epoxy glass fiber powder and wood pulp powder, and in the secondary air separation process, low-temperature non-combustion-supporting gas is intermittently fed, so that the temperature in the secondary air separation process is reduced, and aluminum powder explosion caused by the fact that the aluminum powder contacts oxygen and water in the air is prevented, the technical problem that the waste generated in the drilling process of the circuit board is difficult to recycle is solved, meanwhile, the technical problem that the aluminum powder is easy to contact oxygen and water in the air to cause explosion in the recycling process is solved, and the effects of recycling resources and safely recycling the resources are achieved.

Drawings

FIG. 1 is a schematic diagram of a frame structure of a device for separating and recycling circuit board drilling waste according to an embodiment;

FIG. 2 is a schematic diagram illustrating the structure of the apparatus for separating and recycling circuit board drilling waste according to an embodiment;

FIG. 3 is a schematic flow chart illustrating a method for separating and recycling circuit board drilling waste according to an embodiment;

FIG. 4 is a schematic view of a part of the apparatus for separating and recycling circuit board drilling waste according to an embodiment;

fig. 5 is a partial structural view of the device for separating and recycling circuit board drilling waste in one embodiment.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention. In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 3, the present invention provides a method for separating and recycling circuit board drilling waste, which comprises the following steps: step S101: and collecting waste generated in the drilling process of the circuit board in real time. Step S103: and crushing the collected waste. Step S105: and (4) performing primary air separation on the crushed waste to obtain copper powder and a primary air separation separator. Step S107: and (3) performing secondary air separation on the primary air separation isolate, and intermittently feeding low-temperature non-combustion-supporting gas into an air separation air channel in the secondary air separation to obtain aluminum powder and the secondary air separation isolate. Step S109: and performing tertiary air separation on the secondary air separation isolate to obtain epoxy glass fiber powder and wood pulp powder.

Referring to fig. 1 and 2 together, the present invention provides a device 10 for separating and recycling circuit board drilling waste, the device 10 for separating and recycling circuit board drilling waste is applied to the method for separating and recycling circuit board drilling waste, the device 10 for separating and recycling circuit board drilling waste comprises: the drilling waste collecting and sorting device comprises a collecting mechanism 100, a crushing mechanism 200, a separating mechanism 300 and a recycling mechanism 400, wherein the collecting mechanism 100 is used for collecting drilling waste, the crushing mechanism 200 is used for crushing the drilling waste from the collecting mechanism 100, the separating mechanism 300 is used for separating and sorting the crushed drilling waste, and the recycling mechanism 400 is used for collecting various separated substances; the collection mechanism 100 includes a collection suction pipe 110 and a negative pressure generator 120, and an input end of the collection suction pipe 110 is used to be adjacent to a drilling area of the circuit board to recover waste generated in the drilling process of the circuit board in real time. The output end of the collecting suction pipe 110 is communicated with the input end of the negative pressure generator 120, the output end of the negative pressure generator 120 is communicated with the input end of the crushing mechanism 200, and the negative pressure generator 120 is used for generating negative pressure so that the input end of the collecting suction pipe 110 adjacent to the drilling area of the circuit board sucks waste and sends the waste into the crushing mechanism 200; the crushing mechanism 200 is configured to crush the waste from the collecting mechanism 100 and send the crushed waste to the separating mechanism 300; the separating mechanism 300 comprises a primary cyclone separator 310, a secondary cyclone separator 320, a tertiary cyclone separator 330 and an explosion-proof air feeder 340, wherein a feeding pipe of the primary cyclone separator 310 is communicated with the output end of the crushing mechanism 200, an ash discharging pipe of the primary cyclone separator 310 is communicated with a copper powder recovery pipe of the recovery mechanism 400, and an air outlet pipe of the primary cyclone separator 310 is communicated with a feeding pipe of the secondary cyclone separator 320; an ash discharge pipe of the secondary cyclone separator 320 is communicated with an aluminum powder recovery pipe of the recovery mechanism 400, and an air outlet pipe of the secondary cyclone separator 320 is communicated with a feeding pipe of the third cyclone separator 330; an ash discharge pipe of the third-stage cyclone 330 is communicated with a fiber powder recovery pipe of the recovery mechanism 400, and an air outlet pipe of the third-stage cyclone 330 is communicated with a wood pulp powder recovery pipe of the recovery mechanism 400; the low-temperature air feed pipe of the explosion-proof air feeder 340 is communicated with the air inlet pipe of the secondary cyclone separator 320 and is used for intermittently feeding low-temperature non-combustion-supporting gas to the secondary cyclone separator 320; the recovery mechanism 400 comprises a copper powder recovery box 410, an aluminum powder recovery box 420, a fiber powder recovery box 430 and a wood pulp powder recovery box 440, wherein the copper powder recovery box 410 is provided with a copper powder recovery pipe 411 communicated with an ash discharge pipe of the primary cyclone separator 310, and the aluminum powder recovery box 420 is provided with an aluminum powder recovery pipe 421 communicated with an ash discharge pipe of the secondary cyclone separator 320; the fiber powder recovery tank 430 is provided with a fiber powder recovery pipe 431 communicated with the ash discharge pipe of the tertiary cyclone 330; the wood pulp powder recovery tank 440 is provided with a wood pulp powder recovery pipe 441 communicated with the air outlet pipe of the tertiary cyclone 330.

According to the device 10 for separating and recovering circuit board drilling waste, waste generated in the drilling process of a circuit board is fed into the crushing mechanism 200 in real time to be crushed, waste powder crushed by the crushing mechanism 200 is subjected to three-stage separation through the primary cyclone separator 310, the secondary cyclone separator 320 and the tertiary cyclone separator 330, copper powder, aluminum powder, epoxy glass fiber powder and wood pulp powder are respectively collected into the corresponding copper powder recovery box 410, aluminum powder recovery box 420, fiber powder recovery box 430 and wood pulp powder recovery box 440, the explosion-proof machine 340 intermittently feeds low-temperature non-combustion-supporting gas into the secondary cyclone separator 320, so that the temperature in the secondary cyclone separator 320 is reduced, aluminum powder explosion caused by contact of the aluminum powder with oxygen and water in the air is prevented, the technical problem that waste generated in the drilling process of the circuit board is difficult to recover is solved, meanwhile, the technical problem that explosion caused by easy contact of the oxygen and water in the air in the recovery process is solved, and the effects of resource recycling and safe resource recovery are realized.

The drilling process is most likely to generate powder in three shapes, namely strip-shaped powder, block-shaped powder and fragment-shaped powder, and the strip-shaped powder and the block-shaped powder are not easy to be broken and recycled at one time, so that the drilling powder is firstly crushed and then separated. As shown in fig. 3, during the mechanical drilling and drilling process, the drill 90 needs to pass through the cover plate 81, the circuit board 70 and the backing plate 82, wherein the circuit board is also called a circuit board or a circuit board. The cover plate contains alloy aluminum, the circuit board contains copper and epoxy resin, the backing plate contains wood fiber wood pulp, a drill bit is clamped by a chuck in a main shaft of the drilling machine to rotate at a high speed in the drilling process, and contacted substances are smashed into powder by the drill bit rotating at the high speed and are sucked away by the collecting suction pipe. To deal with the drilling waste, we do not only need to change the waste of different shapes into finer powder, but also need to separate the different substances. According to hydrodynamics, when a heterogeneous system rotates around a central shaft, the moving object is subjected to the action of centrifugal force, and the higher the rotation rate is, the larger the centrifugal force is applied to the moving object. If the specific gravity of the particles is larger, the particles will be gradually moved away from the central axis in the direction of the centrifugal force. After a period of time of centrifugal operation, effective separation of substances with different specific gravities can be realized. Then, aiming at small parts of drilled hole powder which are not broken, a pulverizer is added to be connected with a grading separator, the separated powder respectively goes to different area separation ash discharge openings, each opening is connected with different pipelines, and finally 4 different kinds of substance powder are obtained.

Table 1 below gives the specific gravity of four types of drilling cuttings:

specific gravity of copper	Specific gravity of alloy aluminum cover plate	Specific gravity of epoxy glass fiber	Specific gravity of medium density wood pulp board
				8.9g/cm ³	2.7-2.8g/cm ³	1.72-1.8g/cm ³	0.55-0.88g/cm ³

TABLE 1

In order to better collect the waste generated during the drilling process of the circuit board, in one embodiment, as shown in fig. 4 and 5, the collecting mechanism 100 further includes a collecting jaw 111 and a collecting support plate 112, an input end of the collecting suction pipe 110 adjacent to the drilling area of the circuit board is respectively communicated with the collecting jaw 111 and the collecting support plate 112, and the collecting jaw 111 and the collecting support plate 112 collect the waste generated during the drilling process of the circuit board under the action of the negative pressure generator 120. The collecting jaw 111 is disposed on the cover plate 81 and around the drill 90, and is used for collecting waste containing alloy aluminum, copper, epoxy resin and wood pulp of wood fibers, which is broken into powder by the drill 90 rotating at a high speed when the drill 90 drills a hole. The collecting tray 112 is used to receive the placing pad 82, that is, the pad 82, the circuit board 70 and the cover plate 81 are stacked on the collecting tray 112 in sequence. The area of the collection tray 112 is greater than the area of the backing plate 82. The collection blade 112 serves to collect the waste containing the alloy aluminum, copper, epoxy resin and wood pulp, which is broken into powder by the drill 90 rotating at a high speed and scattered around the pad 82. In this way, the collecting jaw 111 is arranged around the drill 90 to collect the waste above the cover plate 81 and around the drill 90; the collecting support plate 112 can collect waste around the backing plate 82 due to its large area, so as to collect waste containing alloy aluminum, copper, epoxy resin and wood pulp broken into powder by the drill 90 rotating at high speed in a large range, improve the recycling rate of drilling waste, and better collect waste generated in the drilling process of the circuit board.

In one embodiment, the collecting jaw 111 includes a first jaw handle 121, a second jaw handle 122, a first rotating shaft 123, a second rotating shaft 124, a first flow tube 125, a second flow tube 126 and a collecting tube 127, the first jaw handle 121, the first rotating shaft 123 and the first flow tube 125 are sequentially communicated, the second jaw handle 122, the second rotating shaft 124 and the second flow tube 126 are sequentially communicated, the first jaw handle 121 is rotatably connected with the first flow tube 125 through the first rotating shaft 123, the second jaw handle 122 is rotatably connected with the second flow tube 126 through the second rotating shaft 124, the ends of the first flow tube 125 and the second flow tube 126 are respectively communicated with the input end of the collecting tube 127, and the output end of the collecting tube 127 is communicated with the input end of the collecting suction tube 110. The first forceps handle 121 has a plurality of first collecting holes 128 formed at a side thereof facing the second forceps handle 122, and the second forceps handle 122 has a plurality of second collecting holes 129 formed at a side thereof facing the first forceps handle 121. In this way, under the action of the negative pressure generator 120, the pressure in the peripheral area of each first collecting hole 128 and each second collecting hole 129 is reduced, and under the action of the atmospheric pressure, the waste generated during the drilling process of the circuit board will be collected into the collecting suction pipe 110 by the first collecting holes 128 and the second collecting holes 129. Meanwhile, the distance between the first clamp handle 121 and the second clamp handle 122 is adjustable, and the distance between the first clamp handle 121 and the second clamp handle 122 can be adjusted according to the drilling speed of the drill bit 90 and the layer number of the circuit board 70 so as to improve the efficiency of waste collection.

In one embodiment, the first and

second handles

121, 122 are both arcuate tubular structures. The plurality of first collecting holes 128 are sequentially spaced along the arc direction of the first jaw shank 121. A plurality of second collecting holes 129 are sequentially provided at intervals along the arc direction of the second jaw handle 122. An oval negative pressure region is formed between the first and

second handles

121, 122 in which the drill bit 90 is located. When the atmospheric pressure of the elliptical negative pressure area is reduced, a pressure difference is formed between the atmospheric pressure of the elliptical negative pressure area and the normal atmospheric pressure outside the elliptical negative pressure area, so that the airflow flows out of the elliptical negative pressure area into the elliptical negative pressure area, an air curtain is formed in the flowing process of the airflow, on one hand, the waste can be prevented from splashing to the outside, and on the other hand, the waste is driven to enter the first collecting hole 128 and the second collecting hole 129 according to the flowing direction of the airflow. In this way, the first and

second handles

121 and 122 form a surrounding for the drill 90, when the negative pressure generator 120 is operated, the air pressure in the negative pressure region between the first and

second handles

121 and 122 is reduced, the air pressure outside the first and

second handles

121 and 122 is greater than the air pressure in the negative pressure region between the first and

second handles

121 and 122, a first collecting channel is formed between the first handle 121, the first rotating shaft 123 and the first flow pipe 125, and a second collecting channel is formed between the second handle 122, the second rotating shaft 124 and the second flow pipe 126, at this time, the waste broken into powder by the drill 90 enters the collecting pipe 127 through the first collecting channel of the first handle 121, the first rotating shaft 123 and the first flow pipe 125 under the action of the atmospheric pressure, and then enters the collecting pipe 127 through the second handle 122, the second rotating shaft 124 and the second flow pipe 126, and then the waste is collected into the collecting pipe 127, and then the waste is collected into the collecting pipe 110.

As shown in fig. 2, 4 and 5, in one embodiment, the collection blade 112 is a hollow rectangular parallelepiped structure. A collection chamber 1121 is provided in the collection tray 112. A plurality of third collecting holes 130 are opened on one side surface of the collecting supporting plate 112 facing the collecting binding clip 111, and each third collecting hole 130 is respectively communicated with the collecting chamber 1121. Preferably, the respective third collecting holes 130 are distributed in a matrix on the side of the collecting tray 112. The collection tray 112 is connected to the collection suction pipe 110, and the collection chamber 1121 communicates with the collection suction pipe 110. The area of the collecting support plate 112 is larger than that of the backing plate 82, each third collecting hole 130 located at the periphery of the collecting support plate 112 is exposed, under the action of the negative pressure generator 120, the waste containing alloy aluminum, copper, epoxy resin and wood pulp, which is broken into powder by the drill 90 rotating at a high speed and scattered around the backing plate 82, enters the collecting chamber 1121 from each exposed third collecting hole 130, and is finally uniformly conveyed into the collecting suction pipe 110. Thus, under the structure of the collecting supporting plate 112 with a large area, the waste around the backing plate 82 can be collected, so that the waste which is smashed into powder by the drill 90 rotating at a high speed and contains alloy aluminum, copper, epoxy resin and wood pulp of wood fiber is collected in a large range, the recycling rate of the drilling waste is improved, and the waste generated in the drilling process of the circuit board is better collected.

Further, the surface of the collecting tray 112 facing the pad 82 is provided with a plurality of limiting protrusions (not shown), each of the limiting protrusions is uniformly distributed on the surface of the collecting tray 112, and the top of each of the limiting protrusions contacts with the top of the pad 82, so that a collecting gap (not shown) is formed between the collecting tray 112 and the pad 82, that is, the pad 82 does not directly contact with the collecting tray 112 under the limitation of each of the limiting protrusions. The collecting gaps are respectively communicated with the third collecting holes 130, and under the action of the negative pressure generator 120, the opening of the collecting gaps has low atmospheric pressure, and waste containing alloy aluminum, copper, epoxy resin and wood pulp of wood fibers, which is smashed into powder by the drill 90 rotating at high speed, enters the third collecting holes 130 from the collecting gaps between the collecting supporting plate 112 and the backing plate 112 and enters the collecting chamber 1121. Therefore, the collection gap is formed between the collection supporting plate 112 and the backing plate 82 through the plurality of limiting protrusions, so that the plurality of third collection holes 130 on the surface of the collection supporting plate 112 can participate in collection of waste, and the collection efficiency of the waste is further improved.

Because the waste contains aluminum scraps, the aluminum scraps are crushed into aluminum powder through the crushing mechanism, and the aluminum powder is a second-level article which burns in water and reacts with water energy to generate hydrogen and release heat. Sometimes, hou Gansao aluminum powder can explode because the tiny dry aluminum powder particles can be suspended in the air, which increases the contact surface with the air and increases the chemical activity of the aluminum powder particles, and once the dust reaches a certain amount in the air, the dust can rapidly deflagrate when encountering a fire source, which instantly generates a large amount of heat and combustion products to cause severe expansion of gas, steam and the like, thereby causing the explosion effect. Fire caused by explosion of aluminum powder cannot use water, but should be extinguished using a foam extinguisher. The fire is isolated from the air by the foam covering. This is because aluminum reacts chemically with water to produce hydrogen gas, which cannot be used to extinguish fires. There has been an example in which a fire caused by explosion of aluminum powder with water is extinguished to cause a reopening. Most people do not know that the aluminum powder can explode, and particularly, long-time polishing operation enables a lot of aluminum powder to be diffused in the air in an operating factory building, the ignition point of the aluminum is quite low, and the aluminum can explode as long as the aluminum powder meets a fire source or is rubbed at high temperature. In one embodiment, the normal temperature gas pipe of the explosion-proof gas feeder 340 is communicated with the aluminum powder recovery tank 420, and is used for intermittently feeding normal temperature non-combustion-supporting gas to the aluminum powder recovery tank 420. In one embodiment, the normal-temperature non-combustion-supporting gas is carbon dioxide gas at 20-25 ℃. The feeding of the non-combustion-supporting gas at normal temperature reduces the oxygen content of the air in the aluminum powder recovery box, reduces the contact area of the aluminum powder with oxygen and water in the air, and prevents the explosion of the aluminum powder. Therefore, normal-temperature non-combustion-supporting gas is intermittently fed into the aluminum powder recovery box 420, so that on one hand, the oxygen content in the aluminum powder recovery box 420 is reduced, and explosion caused by large-range contact of aluminum powder and oxygen is avoided; on the other hand, the purpose of feeding the normal-temperature non-combustion-supporting gas into the aluminum powder recovery tank 420 is to reduce the oxygen content in the aluminum powder recovery tank 420, and the intermittent gas supply can control the amount of the normal-temperature non-combustion-supporting gas fed into the aluminum powder recovery tank 420, so that the cost is saved, and the waste caused by excessive input of the normal-temperature non-combustion-supporting gas into the aluminum powder recovery tank 420 is avoided.

Because the aluminum powder is mixed in the powder of other wastes when the aluminum powder is not separated by the secondary cyclone separator, the contact area of the aluminum powder and oxygen in the air is small, and dust explosion of the aluminum powder can not occur. However, when the aluminum powder passes through the secondary cyclone and is separated, the aluminum powder is accumulated in a large amount, and the contact area with oxygen in the air is increased during the separation process, and at this time, the probability of explosion of the aluminum powder occurring in the secondary cyclone is increased. For this reason, it is necessary to reduce the oxygen content of the air in the secondary cyclone. In one embodiment, the low temperature air feed pipe of the explosion-proof air feeder 340 is communicated with the air inlet pipe of the secondary cyclone 320, and is used for intermittently feeding the low temperature non-combustion-supporting gas to the secondary cyclone 320. In this embodiment, the low-temperature non-combustion-supporting gas is fed to the secondary cyclone separator 320 through the low-temperature gas feed pipe of the explosion-proof gas feeder 340, and the low-temperature non-combustion-supporting gas is fully dispersed in the secondary cyclone separator, so that the oxygen content in the air in the secondary cyclone separator can be effectively reduced.

In one embodiment, the low temperature non-combustion supporting gas is carbon dioxide gas at 5 to 10 degrees celsius. In this embodiment, the low-temperature non-combustion-supporting gas is intermittently supplied to the secondary cyclone 320, that is, the carbon dioxide gas is regularly and intermittently supplied to the secondary cyclone 320 at a temperature of 5 to 10 ℃. Low temperature means a temperature lower than indoor temperature, such as 5 to 10 degrees centigrade, in order to lower the temperature of the aluminum powder and prevent explosion of the aluminum powder due to high temperature. The intermittent operation is adopted to prevent the explosion caused by the contact of the aluminum powder with moisture and the generation of liquefied water drops due to the condensation of the moisture in the air because the ambient temperature of the aluminum powder is reduced for a long time because the non-combustion-supporting gas is low in temperature for a long time. In addition, the aluminum powder can be prevented from being adhered to the pipe wall to cause the blockage of the pipe even though the aluminum powder is not exploded when meeting water due to the liquefied water drops generated by the condensation of the moisture in the air.

In one embodiment, the copper powder recycling box 410 is further provided with a secondary copper powder conveyor (not shown) which is communicated with the input end of the crushing mechanism 200 and is used for conveying copper powder in the copper powder recycling box 410 to the crushing mechanism 200 for secondary crushing and air separation again. Secondary copper powder conveyer will carry out the regrinding through the once-through grinding and the copper powder after the selection by winnowing sends into rubbing crusher 200, the purpose is that the regrinding is remaining in the copper powder at the once-through grinding in-process other impurity, make the particle radius of copper powder littleer simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of copper powder is higher, it is few to mix other impurity content at the copper powder, the later stage of being convenient for is to the recycle of copper powder.

In one embodiment, the aluminum powder recycling bin 420 is further provided with a secondary aluminum powder conveyor (not shown) which is communicated with the input end of the crushing mechanism 200 and is used for conveying the aluminum powder in the aluminum powder recycling bin 420 to the crushing mechanism 200 for secondary crushing and air separation again. The secondary aluminium powder conveyer will carry out the regrinding through the primary crushing and the aluminium powder after the selection by winnowing sends into rubbing crusher structure 200, the purpose is that the regrinding is at the remaining other impurity in the aluminium powder of primary crushing in-process, make the particle radius of aluminium powder littleer simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of aluminium powder is higher, mix other impurity content at the aluminium powder very few, the later stage of being convenient for is to the recycle of aluminium powder.

In one embodiment, the fiber powder recycling box 430 is further provided with a secondary fiber powder conveyor (not shown) which is communicated with the input end of the crushing mechanism 200 and is used for conveying the fiber powder in the fiber powder recycling box 430 to the crushing mechanism 200 for secondary crushing and air separation again. The secondary fiber powder conveyer will carry out the regrinding through the crushing and sending into rubbing crusher structure 200 through the fibre powder after the selection by winnowing, the purpose is that the regrinding is at the remaining other impurity in the fibre powder of the crushing in-process once, make the particle radius of fibre powder littleer simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of fibre powder is higher, mix other impurity content at the fibre powder very few, the later stage of being convenient for is to the recycle of fibre powder.

In one embodiment, the wood pulp powder recycling bin 440 further comprises a secondary wood pulp powder conveyor (not shown) in communication with the input end of the crushing mechanism 200, wherein the secondary wood pulp powder conveyor is used for conveying the wood pulp powder in the wood pulp powder recycling bin 440 into the crushing mechanism 200 for secondary crushing and secondary air separation. The secondary wood pulp powder conveyer will carry out the regrinding through primary crushing and the wood pulp powder after the selection by winnowing sends into rubbing crusher structure 200, the purpose is that the regrinding is at the remaining other impurity in the wood pulp powder of primary crushing in-process, make the particle radius of wood pulp powder littleer simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of wood pulp powder is higher, it is few to mix other impurity content at wood pulp powder, the later stage of being convenient for is to the recycle of wood pulp powder.

It should be noted that, in the above embodiments, for example, the secondary copper powder conveyor, the secondary aluminum powder conveyor, the secondary fiber powder conveyor, the secondary wood pulp powder conveyor, and the like may all adopt a conveyor for conveying powder and a method for conveying powder, as disclosed in chinese patent CN200980121366.1, or adopt a powder conveying method for stably conveying powder and a powder conveying system thereof, as disclosed in chinese patent CN200910163757.1, and of course, a powder conveyor commonly used in the art may also be adopted to convey, so as to achieve secondary pulverization, such that the diameter of powder particles is smaller, and the separation effect is better.

In one embodiment, the collecting mechanism 100 further comprises a collecting tank (not shown) having an input connected to the output of the negative pressure generator 120 and an output connected to the input of the shredding mechanism 200, the collecting tank being adapted to feed the waste into the shredding mechanism 200. The waste generated by the circuit board in the drilling process can be uniformly collected by the collecting box and uniformly output after collection, namely the waste generated by the circuit board in the drilling process is uniformly output to the crushing mechanism, so that the waste can be output to the crushing mechanism after being collected for a period of time, and the crushing mechanism is opened at the moment, so that the crushing mechanism can work in a rated working state, the condition that the crushing mechanism runs in a no-load mode is avoided, and the cost is saved.

In one embodiment, the output of the collection box is provided with a flow control valve through which the collection box feeds the shredder mechanism 200 in a metered amount. Therefore, the quantity of the wastes output by the collecting box to the crushing mechanism can be quantitatively controlled through the flow control valve, so that the proper quantity of the wastes can be matched according to the power of the crushing mechanism for quantitative output, the crushing mechanism is ensured to work under the rated power, the factory safety and no pollution are ensured, namely, the crushing mechanism can completely crush the wastes fed into the crushing mechanism, and the crushing process of the wastes is more accurate and efficient.

Referring to fig. 3, in order to further illustrate the method for separating and recycling the circuit board drilling waste, the method is also reversely established on the basis of the device for separating and recycling the circuit board drilling waste, which can be understood as the using principle or the operating principle of the device for separating and recycling the circuit board drilling waste, and belongs to the component part of the device for separating and recycling the circuit board drilling waste, the method for separating and recycling the circuit board drilling waste comprises the following steps:

step S101: and collecting waste generated in the drilling process of the circuit board in real time.

Specifically, the circuit board is most likely to generate three types of powder in the drilling process, namely, strip-shaped, block-shaped and chip-shaped powder, namely waste, and the waste generated in the drilling process is generated when the drill bit works, and the waste needs to be collected in real time in the whole process from the beginning to the end of drilling so as to achieve the purpose of completely collecting and processing the waste.

In one embodiment, as shown in fig. 1 to 3, a device 10 for separating and recycling circuit board drilling waste is provided, the device comprising: the drilling waste collection device comprises a collection mechanism 100, a crushing mechanism 200, a separation mechanism 300 and a recovery mechanism 400, wherein the collection mechanism 100 is used for collecting drilling waste. The collection mechanism 100 includes a collection suction pipe 110 and a negative pressure generator 120, and an input end of the collection suction pipe 110 is used to be adjacent to a drilling area of the circuit board to recover waste generated in the drilling process of the circuit board in real time. The output end of the collection suction pipe 110 is communicated with the input end of the negative pressure generator 120, the output end of the negative pressure generator 120 is communicated with the input end of the crushing mechanism 200, and the negative pressure generator 120 is used for generating negative pressure to enable the input end of the collection suction pipe 110 adjacent to the drilling area of the circuit board to suck the waste and send the waste into the crushing mechanism 200.

In order to better collect the waste generated during the drilling process of the circuit board, in one embodiment, as shown in fig. 3 and 4, the collecting mechanism 100 further includes a collecting jaw 111 and a collecting support plate 112, an input end of the collecting suction pipe 110 adjacent to the drilling area of the circuit board is respectively communicated with the collecting jaw 111 and the collecting support plate 112, and the collecting jaw 111 and the collecting support plate 112 collect the waste generated during the drilling process of the circuit board under the action of the negative pressure generator 120. The collecting jaw 111 is disposed on the cover plate 81 and around the drill 90, and collects waste containing alloy aluminum, copper, epoxy resin and wood pulp of wood fibers, which is broken into powder by the drill 90 rotating at a high speed while the drill 90 drills a hole. The collecting tray 112 is used to receive the placing pad 82, that is, the pad 82, the circuit board 70 and the cover plate 81 are stacked on the collecting tray 112 in sequence. The area of the collection tray 112 is greater than the area of the backing plate 82. The collecting blade 112 serves to collect the waste containing the alloy aluminum, copper, epoxy resin and wood pulp of wood fiber, which is broken into powder by the drill 90 rotating at a high speed and scattered around the pad 82. In this way, the collecting jaw 111 is arranged around the drill 90 to collect the waste above the cover plate 81 and around the drill 90; the collecting support plate 112 can collect waste around the backing plate 82 due to its large area, so as to collect waste containing alloy aluminum, copper, epoxy resin and wood pulp, which is broken into powder by the drill 90 rotating at high speed, in a large range, thereby improving the recycling rate of drilling waste and better collecting waste generated in the drilling process of the circuit board.

In one embodiment, the first and

second handles

121 and 122 is reduced, the air pressure outside the first and

second handles

121 and 122, a first collecting channel is formed between the first handle 121, the first rotating shaft 123 and the first flow pipe 125, and a second collecting channel is formed between the second handle 122, the second rotating shaft 124 and the second flow pipe 126, at this time, the waste broken into powder by the drill 90 will enter the collecting pipe 127 through the first collecting channel of the first handle 121, the first rotating shaft 123 and the first flow pipe 125 under the atmospheric pressure, and enter the collecting pipe 127 through the second collecting channel of the second handle 122, the second rotating shaft 124 and the second flow pipe 126, and then the waste is collected into the collecting pipe 110 by the collecting pipe 127, so as to be more fully collected.

As shown in fig. 2, 4 and 5, in one embodiment, the collection blade 112 is a hollow rectangular parallelepiped. A collection chamber 1121 is provided in the collection tray 112. A plurality of third collecting holes 130 are opened on one side surface of the collecting pallet 112 facing the collecting forceps head 111, and each third collecting hole 130 is respectively communicated with the collecting chamber 1121. Preferably, the respective third collecting holes 130 are distributed in a matrix on the side of the collecting tray 112. The collection tray 112 is connected to the collection suction pipe 110, and the collection chamber 1121 communicates with the collection suction pipe 110. The area of the collecting support plate 112 is larger than that of the backing plate 82, each third collecting hole 130 located at the periphery of the collecting support plate 112 is exposed, under the action of the negative pressure generator 120, the waste containing alloy aluminum, copper, epoxy resin and wood pulp, which is broken into powder by the drill 90 rotating at a high speed and scattered around the backing plate 82, enters the collecting chamber 1121 from each exposed third collecting hole 130, and is finally uniformly conveyed into the collecting suction pipe 110. Thus, under the structure of the collecting supporting plate 112 with a large area, the waste around the backing plate 82 can be collected, so that the waste which is smashed into powder by the drill 90 rotating at a high speed and contains alloy aluminum, copper, epoxy resin and wood pulp of wood fiber is collected in a large range, the recycling rate of the drilling waste is improved, and the waste generated in the drilling process of the circuit board is better collected.

Further, the surface of the collecting support plate 112 facing the backing plate 82 is provided with a plurality of limiting protrusions (not shown), each of the limiting protrusions is uniformly distributed on the surface of the collecting support plate 112, and the top of each of the limiting protrusions is in contact with the top of the backing plate 82, so that a collecting gap (not shown) is formed between the collecting support plate 112 and the backing plate 82, that is, the backing plate 82 is not in direct contact with the collecting support plate 112 under the limitation of each of the limiting protrusions. The collecting gaps are respectively communicated with the third collecting holes 130, and under the action of the negative pressure generator 120, the opening of the collecting gaps has low atmospheric pressure, and waste containing alloy aluminum, copper, epoxy resin and wood pulp of wood fibers, which is smashed into powder by the drill 90 rotating at high speed, enters the third collecting holes 130 from the collecting gaps between the collecting supporting plate 112 and the backing plate 112 and enters the collecting chamber 1121. Therefore, the collection gap is formed between the collection supporting plate 112 and the backing plate 82 through the plurality of limiting protrusions, so that the plurality of third collection holes 130 on the surface of the collection supporting plate 112 can participate in collection of waste, and the collection efficiency of the waste is further improved.

Step S103: and crushing the collected waste.

Specifically, in the three shapes of powder scraps generated in the drilling process of the circuit board, the strip-shaped and block-shaped powder scraps are not easy to be broken and recycled at one time, so that the drilling powder should be firstly broken and then separated. The collected wastes are crushed to crush belt-shaped and blocky scraps and other wastes, and all the wastes are granulated after crushing, so that different substances can be separated and recovered conveniently.

In one embodiment, the shredding mechanism 200 is configured to shred the waste from the collecting mechanism 100 and send the shredded waste to the separating mechanism 300. The crushing mechanism 200 can crush the waste through processes of rolling, hammering, vibrating, secondary rolling after screening and the like, so as to achieve the effect of crushing the powder in three shapes generated in the drilling process of the circuit board.

Step S105: and (4) performing primary air separation on the crushed waste to obtain copper powder and a primary air separation separator.

Specifically, as shown in table 1, the drilling process most easily generates three types of cuttings, namely, strip-shaped cuttings, block-shaped cuttings and chip-shaped cuttings, and the strip-shaped cuttings and the block-shaped cuttings are not easily broken and recovered at one time, so the drilling powder should be firstly broken and then separated. As shown in fig. 3, during the mechanical drilling and drilling process, the drill 90 needs to pass through the cover plate 81, the circuit board 70 and the backing plate 82, wherein the circuit board is also called a circuit board or a circuit board. The cover plate contains alloy aluminum, the circuit board contains copper and epoxy resin, the backing plate contains wood fiber wood pulp, a drill bit is clamped by a chuck in a main shaft of the drilling machine to rotate at a high speed in the drilling process, and contacted substances are smashed into powder by the drill bit rotating at the high speed and are sucked away by the collecting suction pipe. To deal with the drilling waste, we do not only need to change the waste of different shapes into finer powder, but also need to separate the different substances. According to hydrodynamics, when a heterogeneous system rotates around a central shaft, the moving object is subjected to the action of centrifugal force, and the higher the rotation rate is, the larger the centrifugal force is applied to the moving object. If the specific gravity of the particles is larger, the particles will be gradually moved away from the central axis in the direction of the centrifugal force. After a period of time of centrifugal operation, effective separation of substances with different specific gravities can be realized. Then, aiming at small parts of unbroken drilling cuttings, a pulverizer is added to be connected with a grading separator, the separated powder respectively goes to different area separation ash discharge openings, each opening is connected with different pipelines, and finally different 4 kinds of substance powder are obtained. Therefore, the copper powder and the first-stage winnowing separated material can be obtained by separating the crushed waste by the first-stage winnowing and preferentially separating the copper powder. The primary winnowing separated matter refers to crushed waste powder except copper powder.

In one embodiment, the primary cyclone 310 is configured to perform primary winnowing to separate the crushed waste. Specifically, the separating mechanism 300 comprises a primary cyclone separator 310, a secondary cyclone separator 320, a tertiary cyclone separator 330 and an explosion-proof air feeder 340, wherein a feeding pipe of the primary cyclone separator 310 is communicated with the output end of the crushing mechanism 200, an ash discharge pipe of the primary cyclone separator 310 is communicated with a copper powder recovery pipe of the recovery mechanism 400, and an air outlet pipe of the primary cyclone separator 310 is communicated with a feeding pipe of the secondary cyclone separator 320; an ash discharge pipe of the secondary cyclone separator 320 is communicated with an aluminum powder recovery pipe of the recovery mechanism 400, and an air outlet pipe of the secondary cyclone separator 320 is communicated with a feeding pipe of the tertiary cyclone separator 330; an ash discharge pipe of the third-stage cyclone 330 is communicated with a fiber powder recovery pipe of the recovery mechanism 400, and an air outlet pipe of the third-stage cyclone 330 is communicated with a wood pulp powder recovery pipe of the recovery mechanism 400; the low-temperature air feed pipe of the explosion-proof air feeder 340 is communicated with the air inlet pipe of the secondary cyclone separator 320 and is used for intermittently feeding low-temperature non-combustion-supporting gas to the secondary cyclone separator 320; the recovery mechanism 400 comprises a copper powder recovery box 410, an aluminum powder recovery box 420, a fiber powder recovery box 430 and a wood pulp powder recovery box 440, wherein the copper powder recovery box 410 is provided with a copper powder recovery pipe 411 communicated with an ash discharge pipe of the primary cyclone separator 310, and the aluminum powder recovery box 420 is provided with an aluminum powder recovery pipe 421 communicated with an ash discharge pipe of the secondary cyclone separator 320; the fiber powder recovery tank 430 is provided with a fiber powder recovery pipe 431 communicated with the ash discharge pipe of the tertiary cyclone 330; the wood pulp powder recovery box 440 is provided with a wood pulp powder recovery pipe 441 communicated with the outlet pipe of the tertiary cyclone 330.

Step S107: and (3) separating the primary winnowing separated matter by secondary winnowing, and intermittently feeding low-temperature non-combustion-supporting gas into a winnowing air channel in the secondary winnowing separation to obtain the aluminum powder and the secondary winnowing separated matter.

Specifically, in the secondary winnowing separation, copper powder is not contained in the primary winnowing separation, and aluminum powder is used in the primary winnowing separation, which has a higher specific gravity. The aluminum powder is a second-level article which burns in water and reacts with water energy to generate hydrogen and release heat. Sometimes Hou Gansao aluminum powder will explode because the tiny dry aluminum powder can suspend in the air, increasing the contact surface with the air, increasing its chemical activity, once the dust reaches a certain amount in the air, it will deflagrate rapidly when meeting the fire source, instantly generating a lot of heat and combustion products, causing the gas, steam, etc. to expand violently, resulting in explosion. Fire caused by explosion of aluminum powder cannot use water, but should be extinguished using a foam extinguisher. The fire is isolated from the air by a foam blanket. This is because aluminum reacts chemically with water to generate hydrogen gas, which cannot be used to extinguish a fire. There has been an example in which a fire caused by explosion of aluminum powder with water is extinguished to cause a reopening. Most people do not know that the aluminum powder can explode, and particularly, long-time polishing operation enables a lot of aluminum powder to be diffused in the air in an operating factory building, the ignition point of the aluminum is quite low, and the aluminum can explode as long as the aluminum powder meets a fire source or is rubbed at high temperature. Therefore, in the secondary air separation, low-temperature non-combustion-supporting gas is intermittently fed into the air separation duct to obtain aluminum powder and secondary air separation products.

When the aluminum powder is not separated by the secondary cyclone separator, namely, when secondary winnowing separation is carried out, the aluminum powder is mixed in the powder of other wastes, and at the moment, the contact area of the aluminum powder and oxygen in the air is small, so that dust explosion of the aluminum powder cannot occur. However, after the aluminum powder is subjected to secondary winnowing separation by the secondary cyclone separator and separated, a large amount of aluminum powder is accumulated, and the contact area with oxygen in the air is increased in the separation process, so that the probability of aluminum powder explosion in the secondary cyclone separator is increased. For this reason, it is necessary to reduce the oxygen content of the air in the secondary cyclone. In one embodiment, the low temperature air feed pipe of the explosion-proof air feeder 340 is communicated with the air inlet pipe of the secondary cyclone 320, and is used for intermittently feeding the low temperature non-combustion-supporting gas to the secondary cyclone 320. In this embodiment, the low-temperature non-combustion-supporting gas is fed to the secondary cyclone separator 320 through the low-temperature gas feed pipe of the explosion-proof gas feeder 340, and the low-temperature non-combustion-supporting gas is fully dispersed in the secondary cyclone separator, so that the oxygen content in the air in the secondary cyclone separator can be effectively reduced, and meanwhile, because the temperature of the low-temperature non-combustion-supporting gas is low, the heat in the secondary cyclone separator can be absorbed, the temperature in the secondary cyclone separator is reduced, the possibility of dust explosion of the aluminum powder in the secondary cyclone separator is further prevented, and the safety of the separation and recovery device for the circuit board drilling waste in the waste recovery process is effectively improved.

In one embodiment, the low temperature air feed pipe of the explosion-proof air feeder 340 is communicated with the air inlet pipe of the secondary cyclone 320, and is used for intermittently feeding the low temperature non-combustion-supporting gas to the secondary cyclone 320. In this embodiment, the low-temperature non-combustion-supporting gas is fed to the secondary cyclone separator 320 through the low-temperature gas feed pipe of the explosion-proof gas feeder 340, and the low-temperature non-combustion-supporting gas is fully dispersed in the secondary cyclone separator, so that the oxygen content in the air in the secondary cyclone separator can be effectively reduced, and meanwhile, because the temperature of the low-temperature non-combustion-supporting gas is low, the heat in the secondary cyclone separator can be absorbed, the temperature in the secondary cyclone separator is reduced, the possibility of dust explosion of the aluminum powder in the secondary cyclone separator is further prevented, and the safety of the separation and recovery device for the circuit board drilling waste in the waste recovery process is effectively improved.

In one embodiment, the low temperature non-combustion supporting gas is carbon dioxide gas at 5 to 10 degrees celsius. In this embodiment, the low-temperature non-combustion-supporting gas is intermittently supplied to the secondary cyclone 320, that is, the carbon dioxide gas is regularly and intermittently supplied to the secondary cyclone 320 at a temperature of 5 to 10 ℃. Low temperature means below room temperature, such as 5 to 10 degrees Celsius, preferably 5 degrees Celsius. The purpose is to reduce the temperature of the aluminum powder and prevent the aluminum powder from exploding due to high temperature. The intermittent operation is adopted to prevent the explosion caused by the contact of the aluminum powder with moisture and the generation of liquefied water drops due to the condensation of the moisture in the air because the ambient temperature of the aluminum powder is reduced for a long time because the non-combustion-supporting gas is low in temperature for a long time. In addition, the aluminum powder can be prevented from being adhered to the pipe wall to cause the blockage of the pipe even though the aluminum powder is not exploded when meeting water due to the liquefied water drops generated by the condensation of the moisture in the air.

Step S109: and (5) separating the secondary air separation isolate by using a tertiary air separation method to obtain epoxy glass fiber powder and wood pulp powder.

Specifically, the secondary winnowing separator does not contain copper powder and aluminum powder, the rest is epoxy glass fiber powder and wood pulp powder, and the epoxy glass fiber powder and the wood pulp powder can be separated through the three-stage cyclone separator 330.

In one embodiment, the copper powder obtained by primary air separation is subjected to secondary crushing and air separation again. Specifically, a secondary copper powder conveyor (not shown) is further arranged in the copper powder recovery box 410, the secondary copper powder conveyor is communicated with the input end of the crushing mechanism 200, and the secondary copper powder conveyor is used for conveying copper powder in the copper powder recovery box 410 into the crushing mechanism 200 for secondary crushing and air separation again. The secondary copper powder conveyer will carry out the regrinding through the copper powder after once smashing and through the selection by winnowing and send into rubbing crusher structure 200, the purpose is that the regrinding is remaining in the copper powder at once smashing in-process other impurity, it is littleer to make the particle radius of copper powder simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of copper powder is higher, mixes other impurity content at the copper powder very few, the later stage of being convenient for is to the recycle of copper powder.

In one embodiment, the aluminum powder obtained by secondary air separation is subjected to secondary crushing and air separation again. Specifically, a secondary aluminum powder conveyor (not shown) is further disposed in the aluminum powder recycling bin 420, the secondary aluminum powder conveyor is communicated with the input end of the crushing mechanism 200, and the secondary aluminum powder conveyor is used for conveying the aluminum powder in the aluminum powder recycling bin 420 into the crushing mechanism 200 for secondary crushing and air separation again. The secondary aluminium powder conveyer will carry out the regrinding through the primary crushing and the aluminium powder after the selection by winnowing sends into rubbing crusher structure 200, the purpose is that the regrinding is at the remaining other impurity in the aluminium powder of primary crushing in-process, make the particle radius of aluminium powder littleer simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of aluminium powder is higher, mix other impurity content at the aluminium powder very few, the later stage of being convenient for is to the recycle of aluminium powder.

In one embodiment, the epoxy glass fiber powder obtained by the three-stage air separation is subjected to secondary crushing and air separation again. Specifically, a secondary fiber powder conveyor (not shown) is further disposed in the fiber powder recycling box 430, the secondary fiber powder conveyor is communicated with the input end of the crushing mechanism 200, and the secondary fiber powder conveyor is used for conveying the fiber powder in the fiber powder recycling box 430 to the crushing mechanism 200 for secondary crushing and air separation again. The secondary fiber powder conveyer will carry out the regrinding through the crushing and sending into rubbing crusher structure 200 through the fibre powder after the selection by winnowing, the purpose is that the regrinding is at the remaining other impurity in the fibre powder of the crushing in-process once, make the particle radius of fibre powder littleer simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of fibre powder is higher, mix other impurity content at the fibre powder very few, the later stage of being convenient for is to the recycle of fibre powder.

In one embodiment, the wood pulp powder obtained by the three-stage air separation is subjected to secondary crushing and air separation again. The wood pulp powder recycling box 440 is also provided with a secondary wood pulp powder conveyor (not shown), the secondary wood pulp powder conveyor is communicated with the input end of the crushing mechanism 200, and the secondary wood pulp powder conveyor is used for conveying the wood pulp powder in the wood pulp powder recycling box 440 into the crushing mechanism 200 for secondary crushing and air separation again. The secondary wood pulp powder conveyer will carry out the regrinding through primary crushing and the wood pulp powder after the selection by winnowing sends into rubbing crusher structure 200, the purpose is that the regrinding is at the remaining other impurity in the wood pulp powder of primary crushing in-process, make the particle radius of wood pulp powder littleer simultaneously, make the selection by winnowing process more accurate high-efficient, and like this, after the regrinding, the purity of wood pulp powder is higher, it is few to mix other impurity content at wood pulp powder, the later stage of being convenient for is to the recycle of wood pulp powder.

In one embodiment, the step of collecting waste generated in the drilling process of the circuit board in real time comprises the following steps: collecting wastes of the area around the drill hole and the drill hole channel in real time in the drilling process of the circuit board; and uniformly collecting the wastes. Further, the step of crushing the collected waste includes: crushing the collected waste; and quantitatively outputting the crushed waste. In this embodiment, a collection box (not shown) is provided in the collection mechanism 100, an input end of the collection box is communicated with an output end of the negative pressure generator 120, an output end of the collection box is communicated with an input end of the crushing mechanism 200, and the collection box is used for feeding the waste into the crushing mechanism 200. The waste generated by the circuit board in the drilling process can be uniformly collected by the collecting box and uniformly output after collection, namely the waste generated by the circuit board in the drilling process is uniformly output to the crushing mechanism, so that the waste can be output to the crushing mechanism after being collected for a period of time, and the crushing mechanism is opened at the moment, so that the crushing mechanism can work in a rated working state, the condition that the crushing mechanism runs in a no-load mode is avoided, and the cost is saved.

In one embodiment, the step of separating the primary air separation product by the secondary air separation, wherein the low-temperature non-combustion-supporting gas is intermittently fed into the air separation duct during the secondary air separation to obtain the aluminum powder and the secondary air separation product, further comprises: and feeding the obtained aluminum powder into normal-temperature non-combustion-supporting gas. In one embodiment, the normal-temperature non-combustion-supporting gas is carbon dioxide gas at 20-25 ℃. Specifically, the normal temperature gas feed pipe of the explosion-proof gas feeder 340 is communicated with the aluminum powder recovery tank 420, and is used for intermittently feeding the normal temperature non-combustion-supporting gas to the aluminum powder recovery tank 420. In one embodiment, the normal-temperature non-combustion-supporting gas is carbon dioxide gas at 20-25 ℃. The oxygen content of the air in the aluminum powder recovery box is reduced by feeding the non-combustion-supporting gas at normal temperature, the contact area of the aluminum powder with oxygen and water in the air is reduced, and the explosion of the aluminum powder is prevented. Therefore, normal-temperature non-combustion-supporting gas is intermittently fed into the aluminum powder recovery box 420, so that on one hand, the oxygen content in the aluminum powder recovery box 420 is reduced, and explosion caused by large-range contact between aluminum powder and oxygen is avoided; on the other hand, the purpose of feeding the normal-temperature non-combustion-supporting gas into the aluminum powder recovery tank 420 is to reduce the oxygen content in the aluminum powder recovery tank 420, and the intermittent gas supply can control the amount of the normal-temperature non-combustion-supporting gas fed into the aluminum powder recovery tank 420, so that the cost is saved, and the waste caused by excessive feeding of the normal-temperature non-combustion-supporting gas into the aluminum powder recovery tank 420 is avoided.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method for separating and recycling drilling waste of a circuit board is characterized by comprising the following steps:

collecting waste generated in the drilling process of the circuit board in real time; wherein, set up the separation recovery unit of circuit board drilling discarded object, separation recovery unit includes: the device comprises a collecting mechanism, a crushing mechanism, a separating mechanism and a recycling mechanism, wherein the collecting mechanism is used for collecting drilling wastes;

the collecting mechanism comprises a collecting suction pipe and a negative pressure generator, wherein the input end of the collecting suction pipe is used for being adjacent to a drilling area of a circuit board, the output end of the collecting suction pipe is communicated with the input end of the negative pressure generator, the output end of the negative pressure generator is communicated with the input end of the smashing mechanism, and the negative pressure generator is used for generating negative pressure so that the input end of the collecting suction pipe adjacent to the drilling area of the circuit board sucks waste and sends the waste into the smashing mechanism;

the collecting mechanism further comprises a collecting clamp head and a collecting supporting plate, the input end of the collecting suction pipe adjacent to the drilling area of the circuit board is respectively communicated with the collecting clamp head and the collecting supporting plate, the collecting clamp head is used for being placed on the cover plate and arranged around the drill bit, and the collecting supporting plate is used for bearing and placing the base plate;

the collecting tong head comprises a first tong handle, a second tong handle, a first rotating shaft, a second rotating shaft, a first flow pipe, a second flow pipe and a collecting pipe, wherein the first tong handle, the first rotating shaft and the first flow pipe are sequentially communicated, the second tong handle, the second rotating shaft and the second flow pipe are sequentially communicated, the first tong handle is rotatably connected with the first flow pipe through the first rotating shaft, the second tong handle is rotatably connected with the second flow pipe through the second rotating shaft, the tail end of the first flow pipe and the tail end of the second flow pipe are respectively communicated with the input end of the collecting pipe, the output end of the collecting pipe is communicated with the input end of the collecting suction pipe, one side of the first tong handle, which faces the second tong handle, is provided with a plurality of first collecting holes, and one side of the second tong handle, which faces the first tong handle, is provided with a plurality of second collecting holes;

the first clamp handle and the second clamp handle are both arc-shaped tubular structures, the first collecting holes are sequentially arranged at intervals along the arc direction of the first clamp handle, the second collecting holes are sequentially arranged at intervals along the arc direction of the second clamp handle, an oval negative pressure area is formed between the first clamp handle and the second clamp handle, and the drill bit is positioned in the oval negative pressure area;

the collecting supporting plate is of a hollow cuboid structure, a collecting chamber is arranged in the collecting supporting plate, a plurality of third collecting holes are formed in one side face, facing the collecting binding clip, of the collecting supporting plate, and each third collecting hole is communicated with the collecting chamber; the third collecting holes are distributed on the side face of the collecting supporting plate in a matrix mode, the collecting supporting plate is connected with the collecting suction pipes, the collecting chamber is communicated with the collecting suction pipes, the area of the collecting supporting plate is larger than that of the backing plate, and the third collecting holes are located on the periphery of the collecting supporting plate Kong Wailou;

crushing the collected waste;

2. The method for separating and recovering the waste of circuit board drilling according to claim 1, wherein the low-temperature non-combustion-supporting gas is carbon dioxide gas at a temperature of 5 to 10 ℃.

3. The method for separating and recovering the waste of the circuit board drilling hole as claimed in claim 1, wherein the copper powder obtained by the primary air separation is subjected to secondary crushing and air separation again.

4. The method for separating and recovering the waste of the drilling holes on the circuit board as claimed in claim 1, wherein the aluminum powder obtained by the secondary air separation is secondarily pulverized and again air separated.

5. The method for separating and recovering the waste of the drilling holes on the circuit board as claimed in claim 1, wherein the epoxy glass fiber powder obtained by the three-stage air separation is secondarily crushed and then again subjected to the air separation.

6. The method for separating and recovering the waste of the circuit board drilling hole according to claim 1, wherein the wood pulp powder obtained by the three-stage air separation is subjected to secondary crushing and air separation again.

7. The method for separating and recycling circuit board drilling waste according to claim 1, wherein the step of crushing the collected waste comprises:

crushing the collected waste;

and quantitatively outputting the crushed waste.

8. The method as claimed in claim 1, wherein the step of separating the primary air separation product by secondary air separation and intermittently feeding a low-temperature non-combustion-supporting gas into the air separation duct to obtain aluminum powder and the secondary air separation product further comprises:

9. The method for separating and recovering the waste of the drilling of the circuit board according to claim 8, wherein the normal-temperature non-combustion-supporting gas is carbon dioxide gas at a temperature of 20 to 25 ℃.

10. The method for separating and recycling circuit board drilling waste according to claim 1, wherein the step of collecting waste generated in the circuit board drilling process in real time comprises:

and uniformly collecting the wastes.