CN111197120A

CN111197120A - Hanging furnace type tin soldering slag chemical purification and recovery equipment and operation method thereof

Info

Publication number: CN111197120A
Application number: CN201811364855.7A
Authority: CN
Inventors: 陈中辉
Original assignee: Lihan Application Technology Co ltd
Current assignee: Lihan Application Technology Co ltd
Priority date: 2018-11-16
Filing date: 2018-11-16
Publication date: 2020-05-26
Anticipated expiration: 2038-11-16
Also published as: CN111197120B

Abstract

The invention discloses a hanging furnace type tin soldering slag chemical purification and recovery device and an operation method thereof. The tin furnace for chemically purifying the soldering tin slag comprises a shell, a furnace liner, a purification round pipe, a connecting pipe, a tin guide groove, a medicine mud outlet sealing mechanism and a stirring mechanism. The furnace pipe is arranged in the shell and is provided with a tin outlet and a medicine mud outlet which are positioned at two adjacent sides of the furnace pipe. The purification circular pipe is arranged in the furnace pipe and is provided with a side hole. The connecting pipe is connected with the medicine mud outlet and the side hole. The tin guide groove is communicated with the tin outlet and extends to the upper part of the wave crest tin dipping furnace through the first side opening. The outlet sealing mechanism is configured to block the outlet and the side hole. The furnace and the purification tube are arranged to hold a liquid solder, and the stirring mechanism extends up and down through a liquid surface of the liquid solder. Therefore, the tin soldering slag and the purified tin liquid and the medicine mud formed by the reaction of the purified tin slag and the purified medicine powder can be effectively separated.

Description

Hanging furnace type tin soldering slag chemical purification and recovery equipment and operation method thereof

Technical Field

The invention relates to a chemical purification and recovery device for soldering tin slag, in particular to a hanging furnace type chemical purification and recovery device for soldering tin slag.

Background

A method and equipment for wave soldering tin melt liquid are applied to the production technology and industrial fields of Printed Circuit Boards (PCBs), electronic components, PCBA and the like. The technology is applied before world war II, and after war II, the technology is further applied to military and civil electronic industry comprehensively and widely, the technology and equipment are continuously evolved, improved and innovated to meet the requirements of printed circuit board circuit layout, component miniaturization, reliability improvement and circuit function complication, and the wave soldering furnace and the soldering technology thereof are more important for stabilizing quality, mass production of printed circuit board assembly and electronic component soldering.

During the processing, part of the liquid solder is oxidized to form useless tin dross (tin oxide, non-melting tin). Common approaches to this problem include high-concentration nitrogen oxidation resistance, high-temperature chemical reaction melting, and mechanical high-temperature fine filtration, all of which have limitations and disadvantages.

Firstly, the high-concentration nitrogen anti-oxidation method is to seal the surface above a soldering tin furnace, which is contacted with air, by a metal cover, seal the PCB and the inlet and the outlet of a conveyer belt by an automatic opening and closing door respectively, and fill nitrogen into the cover to keep the content of the high-concentration nitrogen so as to prevent the high-temperature soldering tin and oxygen in the air from generating oxidation soldering tin. However, the automatic opening and closing door may leak after a short time of use, and thus may not be able to effectively seal the leakage, and the carbonized solder may be generated due to the friction of the solder liquid in the motor-driven or electromagnetic-driven solder jet system.

Furthermore, the generation of oxidized solder and carbonized solder is promoted by the high temperature and the friction of the solder liquid, and thus the high temperature reaction melting of the chemical agent and the mechanical high temperature fine filtering method only deteriorate the situation.

In addition, the fresh tin rod or tin wire cannot remove mineral impurities such as carbonized soldering tin, Silica and the like from Silica, sand grains, Silica grains and other minerals brought by a tin ore area by adopting the three methods.

Therefore, there is a need for a solder dross purification and recycling apparatus that can solve the above problems to improve the soldering quality of the wave soldering furnace.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a solder residue chemical purification and recovery apparatus capable of separating the solder from the impurities in the solder residue, thereby stably covering the impurities and isolating and recovering the pure solder.

To achieve the above objects, according to some embodiments of the present invention, a chemical purification and recycling apparatus for solder dross is disposed at one side of a wave soldering furnace, and includes a base, a chemical purification furnace for solder dross, and a sludge collection box. The tin soldering slag chemical purification tin furnace is arranged on the base and comprises a shell, a furnace pipe, a purification round pipe, a connecting pipe, a tin guide groove, a medicinal mud outlet sealing mechanism and a stirring mechanism. The housing has a first side opening and a second side opening. The furnace pipe is arranged in the shell and is provided with a tin outlet and a medicine mud outlet which are positioned on two adjacent sides of the furnace pipe vertical to the furnace wall. The purification circular pipe is arranged in the furnace pipe and is provided with a side hole. The connecting pipe is connected with the medicine mud outlet and the side hole. The tin guide groove is communicated with the tin outlet and extends to the upper part of the wave crest tin dipping furnace through the first side opening. The medicine mud guide groove is positioned below the medicine mud outlet and extends out of the shell through the second side opening. The outlet sealing mechanism is configured to block the outlet and the side hole. The furnace and the purification tube are arranged to hold a liquid tin, and a portion of the stirring mechanism extends up and down through a liquid surface of the liquid tin. The medicine mud collecting box is positioned below one end of the medicine mud guide groove far away from the furnace pipe.

In one or more embodiments of the invention, the solder dross chemical purification solder furnace further comprises a top cover, a feeding conduit cover plate, and a feeding conduit cover plate control cylinder. The top cover covers the shell and is provided with a feeding opening, and the feeding opening is aligned with the purification circular tube. The feeding conduit is connected with the feeding port. The feeding conduit cover is configured to cover an end of the feeding conduit away from the top cover. The feeding guide pipe cover plate control cylinder is provided with an actuating rod which is connected with the feeding guide pipe cover plate.

In one or more embodiments of the invention, the stirring mechanism includes a stirring shaft, a stirring blade, and a stirring motor. The stirring blade is connected with the stirring shaft and is positioned in the purifying circular pipe. The stirring blade extends up and down through the liquid surface. The stirring motor is configured to drive the stirring shaft to rotate.

In one or more embodiments of the invention, the solder dross chemical cleaning tin furnace further comprises a furnace heating plate and a plurality of heat insulating plates. The furnace heating plate is arranged in the shell and contacts the bottom of the furnace. A plurality of heat shields are disposed within the shell and surround the furnace.

In one or more embodiments of the invention, the sealing mechanism for the outlet comprises a plug head, a solder slag blocking sheet, a plug head driving cylinder and a driving cylinder bracket. The plug is configured to block the sludge outlet of the furnace pipe. The soldering tin slag blocking piece is configured to block the side hole of the purification circular tube. The chock plug driving cylinder is positioned on one side of the chock plug, which is far away from the furnace pipe, and is connected with the chock plug and the soldering tin slag blocking piece. Drive actuating cylinder support and fix to the casing, wherein the chock plug drives actuating cylinder and sets up on driving actuating cylinder support.

In one or more embodiments of the invention, the discharged medicine mud sealing mechanism further comprises two sliding rods, a sliding rod seat, a connecting block and a connecting rod. One end of the two sliding rods is connected with the chock plug. The slide bar seat is arranged on the driving cylinder bracket and is provided with two through holes, and the two slide bars pass through the two through holes. The chock plug driving cylinder is provided with a driving rod, and the connecting seat is connected with the driving rod and the other ends of the two sliding rods. The connecting rod is connected with the solder dross blocking piece and the plug head.

In one or more embodiments of the invention, the dross cleaning tin furnace further comprises an extension pipe which is communicated with the slime outlet and has an abutting surface. The plug head has a flat face configured to closely abut against the extension pipe abutment face.

In one or more embodiments of the invention, the solder dross chemical purification tin furnace further comprises a guide groove heating plate which is positioned below the flux guide groove and abuts against the bottom surface of the flux guide groove.

In one or more embodiments of the invention, the tin guide groove has a first extension and a second extension. The first extending part is far away from the tin outlet and extends, and the second extending part is connected with the first extending part and extends towards the wave crest tin dipping furnace. The width of the second extension part is smaller than that of the first extension part.

According to some embodiments of the present invention, a method of operating a solder dross chemical decontamination solder furnace disposed on a side of a wave solder furnace is provided. The tin furnace for chemically purifying the soldering tin slag comprises a furnace pipe, a purification round pipe, a connecting pipe and a tin guide groove. The furnace pipe is provided with a tin outlet and a medicine mud outlet, the purification circular pipe is arranged in the furnace pipe and is provided with a side hole, and the connection pipe is connected with the medicine mud outlet and the side hole. The tin guiding groove is communicated with the tin outlet and extends to the upper part of the wave crest tin dipping furnace. The tin liquid is contained in the furnace liner, and the liquid surface of the liquid is higher than the bottom end of the side hole of the purification round tube and is lower than the tin outlet. The operation method comprises the following steps: closing the medicine mud outlet and the side hole; pouring the purified medicinal powder into a purification round tube; stirring the purified powder to melt the purified powder into a liquid state; taking out the soldering tin slag from the wave-crest tin dipping furnace, pouring the soldering tin slag into the purification round tube, reacting the soldering tin slag with the purification powder to generate a liquid solder and liquid medicine floating in the liquid solder, wherein the liquid solder flows into the wave-crest tin dipping furnace through the tin outlet and the tin guide groove after the liquid solder is higher than the tin outlet; opening the medicine mud outlet and the side hole; pushing the medicine mud and collecting the medicine mud from the medicine mud outlet.

In conclusion, the tin slag chemical purification furnace adopts the double-layer design of the furnace and the purification circular tube, and can effectively separate the purified tin liquid and the medicine mud formed by the reaction of the tin slag and the purified medicine powder. In addition, the tin slag chemical purification tin furnace is directly arranged beside the wave crest tin furnace, an outlet of the tin guiding groove is directly aligned with the wave crest tin furnace, the purified tin liquid can directly flow back to the wave crest tin furnace, an operator does not need to manually collect and purify the tin liquid and pour the liquid into the wave crest tin furnace, operation is convenient, and the probability that the operator is scalded by the purified tin liquid can be greatly reduced.

Drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, it is described in conjunction with the accompanying drawings as follows:

fig. 1 is a side view illustrating a chemical purification and recovery apparatus for solder dross according to an embodiment of the invention, wherein the chemical purification and recovery apparatus for solder dross is disposed at one side of a wave solder dipping furnace.

Fig. 2 is a side perspective view of the solder dross chemical cleaning tin furnace of the solder dross chemical cleaning recycling apparatus shown in fig. 1.

FIG. 3 is a top perspective view of a portion of the components of the solder dross chemical cleaning solder pot shown in FIG. 2.

Fig. 4 is a partially enlarged side view of a part of the components of the solder dross chemical cleaning solder pot shown in fig. 2.

Fig. 5 is a partially enlarged plan view of a part of the component of the solder flux chemical purification tin furnace shown in fig. 2.

Detailed Description

In order to make the description of the present invention more complete and complete, reference is made to the accompanying drawings and the following description of various embodiments. The elements of the drawings are not to scale and are provided solely for the purpose of illustrating the invention. Numerous implementation details are described below to provide a thorough understanding of the present invention, however, one of ordinary skill in the relevant art will appreciate that the present invention may be practiced without one or more of these implementation details, and thus, these details should not be used to limit the present invention.

Referring to fig. 1, a side view of a solder dross chemical cleaning and recycling apparatus 100 according to an embodiment of the invention is shown. The equipment 100 for chemically purifying and recycling solder dross is disposed on one side of the wave-crest tin dipping furnace 990 and comprises a base 910, a solder dross chemically purifying tin furnace 200 and a sludge collection box 930. The solder dross chemical cleaning furnace 200 is disposed on the base 910 and is used for reducing and removing impurities from the solder dross taken out of the wave solder dipping furnace 990. The tin soldering slag mixes and takes place chemical reaction with purifying powder in tin soldering slag chemical purification stove 200, produces tin liquid and medicine mud, and tin liquid can be by recycle, and medicine mud then can be abandoned. For example, the purified powder is AOP-22S. The liquid has a relatively high specific gravity, so that the slurry and the slag generally float in the liquid. The tin liquid chemical purification furnace 200 separates the tin liquid and the medicine mud by using the above characteristics, and the tin liquid and the medicine mud flow out of the tin chemical purification furnace 200 and then flow into the wave-crest tin dipping furnace 990 and the medicine mud collection box 930 respectively. In some embodiments, the materials of the base 910 and the drug sludge collection box 930 comprise SUS 304. The structure of the solder dross chemical cleaning solder pot 200 is described in detail below.

Referring to fig. 2, a side perspective view of the solder dross chemical cleaning tin furnace 200 of the solder dross chemical cleaning recycling apparatus 100 shown in fig. 1 is shown. The tin furnace 200 for chemically purifying the solder dross includes a housing 210, a furnace tube 215, a purification round tube 220, a connection tube 225, a tin guide groove 230, a slurry guide groove 235, a slurry outlet sealing mechanism 250, and a stirring mechanism 260.

The housing 210 has a hollow structure with an open top. The furnace 215 is also a hollow structure with an open top, is disposed in the casing 210, and is fixed to the casing 210. In some embodiments, the furnace bladder 215 has a square shape that includes four vertical furnace walls, the top of which is bent ninety degrees outward and connected to the housing 210. The cleaning circular tube 220 is also a hollow structure with an open top, and is fixed to the furnace pipe 215 and suspended in the furnace pipe 215. In some embodiments, the top of cleaning round tube 220 is aligned with the top of furnace 215 at a height, and the bottom of cleaning round tube 220 is about 20mm from the bottom of furnace 215.

The cleaning circular pipe 220 has a filter screen 220b at the bottom of the cleaning circular pipe 220. The filter screen 220b may allow the solder liquid to pass through, and in addition, the purification round tube 220 and the furnace tank 215 have openings above and are the same as the environmental pressure, so that the liquid in the purification round tube 220 and the furnace tank 215 are approximately the same height. The filter screen 220b can also block the slurry and the solder slag, and the slurry and the solder slag are left in the purification circular tube 220 to be prevented from flowing into the furnace pipe 215. In some embodiments, the furnace tube 215 and the cleaning cylinder tube 220 are made of SUS316L stainless steel and have a thickness ranging from 4 to 5 mm.

Referring to fig. 3, a top perspective view of a portion of the components of the solder dross chemical cleaning solder pot 200 shown in fig. 2 is shown. As shown in fig. 3, the furnace 215 has a tin outlet 215a and a slurry outlet 215b, which are located at two adjacent sides of the furnace 215 and are configured to allow the solder liquid and the slurry to pass through and flow out of the furnace 215. The purge barrel 220 has a side hole 220a aligned with the outlet 215 b. The connection tube 225 connects the outlet 215b and the side hole 220 a. In some embodiments, the tin outlet 215a and the sludge outlet 215b are substantially located about two-thirds of the height of the furnace bladder 215.

As shown in fig. 3, the adjacent two sides of the housing 210 have a first side opening 210a and a second side opening 210 b. The tin guide groove 230 is fixed to the housing 210 and communicates with the tin outlet 215 a. The tin guiding groove 230 extends to a position above the wave solder dipping furnace 990 (see fig. 1), and the solder liquid flows into the tin guiding groove 230 after passing through the tin outlet 215a, and flows into the wave solder dipping furnace 990 after flowing along the tin guiding groove 230. In some embodiments, as shown in fig. 3, the tin guiding groove 230 is substantially L-shaped, and has a first extension 231 and a second extension 232. The first extending portion 231 extends away from the solder outlet 215a, and the second extending portion 232 is connected to the first extending portion 231 and extends toward the wave solder dipping furnace 990. The width of the second extension 232 is smaller than that of the first extension 231, and the depth of the tin guiding groove 230 gradually increases (not shown) with increasing distance from the tin outlet 215a, so that the solder liquid can be poured smoothly without overflowing.

As shown in fig. 2 and 3, the medicine mud guide groove 235 is fixed to the housing 210, has one end located below the medicine mud outlet 215b, and extends outward to above the medicine mud collection box 930 (see fig. 1) through the second side opening 210 b. The medicinal mud flows into the medicinal mud guide groove 235 after passing through the side hole 220a, the connecting pipe 225, and the medicinal mud outlet 215b in sequence, and flows into the medicinal mud collection box 930 after flowing along the medicinal mud guide groove 235.

Please refer to fig. 4 and fig. 5 together. Fig. 4 is a partially enlarged side view of the sludge guide groove 235 of the solder dross chemical cleaning tin furnace 200 shown in fig. 2, and fig. 5 is a partially enlarged top view of the sludge guide groove 235 of the solder dross chemical cleaning tin furnace 200 shown in fig. 2. In some embodiments, as shown in fig. 2, the slurry guide groove 235 is formed of an integrally formed SUS316 metal block having a guide flow channel 236. As shown in fig. 4, the guiding channel 236 is a U-shaped groove, and the width of the end close to the discharging opening 215b is larger than the width of the discharging opening 215b and the height of the end close to the discharging opening 215 b. The guiding channel 236 increases in depth (as shown in fig. 2) and decreases in width (as shown in fig. 5) as it moves away from the outlet 215b, ensuring smooth pouring of the slurry and no overflow. In some embodiments, as shown in fig. 5, the end of the guiding channel 236 away from the paste outlet 215b has a substantially semicircular notch 237, and the solder liquid flows into the paste collection box 930 after passing through the notch 237.

In some embodiments, as shown in fig. 2 and 4, the tin furnace 200 further includes a guide groove heating plate 282, which is located below the slurry guide groove 235 and is flush with the bottom of the slurry guide groove 235 to uniformly heat the slurry guide groove 235 and prevent the slurry from solidifying. In some embodiments, as shown in fig. 4, the guide groove heating plate 282 is an electric heating plate comprising an aluminum alloy plate having a circular hole extending along a diagonal line, into which a heating rod 283 is inserted. In some embodiments, the side wall of the guiding groove 235 has two concave holes, in which the temperature sensing rod 233 and the over-temperature protection switch 234 for controlling the electric heating rod are respectively disposed. In some embodiments, the solder dross chemical cleaning solder furnace 200 further comprises a guide slot heating plate 281 attached to the bottom of the solder guide slot 230, and the guide slot heating plate 281 may have a similar structure to the guide slot heating plate 282.

Please refer to fig. 2. The outlet sealing mechanism 250 is configured to block the outlet 215b and the side hole 220 a. For example, when the purified powder reacts with the solder dross to generate the solder liquid, the slurry opening sealing mechanism 250 blocks the slurry outlet 215b and the side opening 220a, so as to prevent the purified powder and the solder dross from flowing out of the slurry outlet 215b and the side opening 220 a. After the purified powder and the soldering tin slag completely react, opening the medicine mud outlet 215b and the side hole 220a, discharging the medicine mud generated by the reaction, adding the purified powder and the soldering tin slag, and continuing to reduce and purify the soldering tin slag.

In some embodiments, the solder dross chemical cleaning solder furnace 200 further comprises a top cover 270, a feeding conduit 271, a feeding conduit cover 272, and a feeding conduit cover control cylinder 273. The top cover 270 is screwed to the housing 210 and covers the opening above the housing 210. The top cover 270 has a feed opening 270a aligned with the purge barrel 220. The feeding conduit 271 communicates with the feeding port 270a and extends from above the top cover 270. The feeding conduit 271 is used for the operator to input the purified powder and the solder dross, and the purified powder and the solder dross fall into the purification tube 220 after being input into the feeding conduit 271, and then the chemical reaction is carried out in the purification tube 220. In some embodiments, the inlet 270a is substantially semi-circular in shape and the inlet conduit 271 has a semi-circular cross-section.

The feeding conduit cover 272 rotatably engages the feeding conduit 271 and is configured to cover an end of the feeding conduit 271 away from the top cover 270. The feed conduit lid control cylinder 273 has an actuating lever 273a that is rotatably connected to the feed conduit lid 272. Actuating lever 273a is configured to push or pull feed conduit flap 272 so that it rotatably opens or closes the top end of feed conduit 271.

In some embodiments, the stirring mechanism 260 comprises a stirring shaft 261, a stirring blade 262, and a stirring motor 263. The stirring shaft 261 extends into the purification cylinder 220 through the top cover 270 (the top cover 270 has a through hole for the stirring shaft 261 to pass through). Stirring vanes 262 are located inside the cleaning barrel 220 and are connected to the stirring shaft 261. The stirring blade 262 extends up and down through a liquid surface (not shown) in the liquid purification tube 220. The stirring motor 263 is configured to drive the stirring shaft 261 and the stirring blade 262 connected to the stirring shaft 261 to rotate. In some embodiments, the rotation axis of the stirring motor 263 is substantially perpendicular to the stirring shaft 261, and the rotation axis of the stirring motor 263 has a bevel gear portion 263a at the end thereof, which is engaged with the bevel gear portion 261a at the tip of the stirring shaft 261 to drive the stirring shaft 261 to rotate. The stirring mechanism 260 can stir the purified powder to melt the powder into a liquid state, and can help the purified powder and the solder slag to be uniformly mixed, so as to accelerate the chemical reaction and also help the medicine mud in the purification round tube 220 to be pushed out through the side hole 220 a.

In some embodiments, the stirring mechanism 260 further comprises a side bracket 265 fixed to the top cover 270 and extending from the left side of the top cover 270. The stirring motor 263 is disposed on the side bracket 265. In some embodiments, a feed conduit cover control cylinder 273 and control cylinder indicator light (not shown) are also provided on the side bracket 265.

In some embodiments, the stirring mechanism 260 further includes a cooling fan (not shown) facing the stirring motor 263 to assist the stirring motor 263 to dissipate heat and cool.

In some embodiments, as shown in FIG. 2, the solder dross chemical cleaning tin furnace 200 further comprises a furnace heating plate 275 and a plurality of heat shields 276. The furnace heating plate 275 is disposed in the housing 210 and located at the bottom of the housing 210, and the furnace heating plate 275 is attached to the bottom of the furnace 215 to uniformly heat the furnace. Insulation 276 surrounds the furnace bladder 215 to maintain the temperature of the furnace bladder 215 and prevent rapid loss of heat energy. In some embodiments, the heat insulation panels 276 are fiberglass panels and are disposed within the four sidewalls of the housing 210, below the furnace heating panels 275, and below the top cover 270, for a total of six panels.

In some embodiments, the furnace heating plate 275 is an electric heating plate comprising an aluminum alloy plate having six horizontal circular holes arranged at equal intervals for six electric heating rods 275a to be inserted. The heat energy generated by the electric heating rod 275a is quickly and uniformly absorbed by the furnace tube 215 due to the excellent thermal conductivity of the aluminum alloy. In some embodiments, heating the furnace bladder 215 from 25 ℃ to 240 ℃ takes no more than 40 minutes.

Please refer to fig. 3. In some embodiments, the outlet sealing mechanism 250 comprises a plug 251, a plug driving cylinder 252, a driving cylinder bracket 253, and a solder dross stop piece 254. The plug 251 is configured to block the sludge outlet 215b of the furnace tube 215. The solder dross stopper 254 is fixed to the plug 251 and has a rounded outer shape. The solder dross stopper 254 is used to block the side hole 220a of the purge cylinder 220 and confine the solder dross within the purge cylinder 220. The plug head driving cylinder 252 is located on a side of the plug head 251 away from the furnace tube 215, and is connected to the plug head 251. The plug head driving cylinder 252 is configured to drive the plug head 251/the solder dross stopper 254 to move closer to or away from the paste outlet 215 b/the side hole 220a to close or open the paste outlet 215 b/the side hole 220 a. A drive cylinder bracket 253 is fixed to the housing 210 and a plug head drive cylinder 252 is provided on the drive cylinder bracket 253.

In some embodiments, the outlet sealing mechanism 250 further comprises two sliding

rods

255, 256, a sliding rod seat 257, a connecting block 258, and a connecting rod 259. The plug 251 is connected to one end of the slide bars 255, 256 in a welded manner. The sliding rod mount 257 is fixed to the driving cylinder bracket 253 and has two through holes for the sliding

rods

255 and 256 to pass through. The stopper driving cylinder 252 has a driving rod 252a connected to the other ends of the slide bars 255 and 256 through a connecting block 258. The solder dross stop piece 254 is located on a side of the plug 251 remote from the slide bars 255, 256 and is connected to the plug 251 by a connecting rod 259. For example, the connecting rod 259, the plug 251, and the solder dam 254 may be welded together. In some embodiments, the sliding

bars

255, 256 are round bars and the material thereof comprises SUS 304.

In some embodiments, the solder dross chemical cleaning solder pot 200 further comprises an extension tube 280 connected to the outer wall of the furnace bladder 215 and communicating with the sludge outlet 215 b. In some embodiments, the extension tube 280 is formed by milling a rectangular small corner counter bore on the protruding structure outside the furnace bladder 215, the diameter of the counter bore is larger than the diameter of the slurry outlet 215b, and has an abutting surface 280 a. The plug 251 is a rectangular small round block having a flat surface 251a substantially identical to the abutting surface 280a of the extension pipe 280, the flat surface 251a can tightly abut against the abutting surface 280a of the extension pipe 280 to seal the outlet 215 b.

Please refer back to fig. 1. In some embodiments, the solder dross chemical cleaning furnace 200 further comprises a large junction box 988 disposed on a side of the housing 210 away from the wave solder dipping furnace 990. A group of wiring bus bars are arranged in a large junction box 988, six groups of electric heating rod wire head terminals for heating the furnace pipe, a group of sensing head wire head terminals for controlling the temperature of the furnace pipe, a group of tin guide groove electric heating rod wire head terminals, a group of chemical mud outlet plug head driving cylinder control valve wire head terminals, a group of tin over-temperature protection heat switch wire head terminals and a group of military standard connector wire head terminals are fixed on the bus bars, and all wires are concentrated into a single military standard connector which is positioned at the bottom of the large junction box so as to be easily detached and quickly installed with high reliability. In some embodiments, large junction box 988 has an outer closure plate (not shown) that is an L-shaped plate and covers the front and top of large junction box 988.

In some embodiments, the apparatus 100 further comprises a blister box support sensing seat 931 screwed to the large junction box 988. The drug mud collection box 930 is disposed on the drug mud collection box support sensing seat 931. In some embodiments, the blister pack support sensing seat 931 includes a proximity sensor (not shown) that is used to confirm that the blister collection box 930 is positioned for blister removal.

In some embodiments, the apparatus 100 further comprises a programmable controller 950 electrically connected to the stirring motor 263 (see fig. 2), the cooling fan, the electrical bar and other electrical components, and executing a PLC automatic control program to control the electrical components. In some embodiments, the program control box 950 stores data for each operation in the PLC memory. In some embodiments, the process control box 950 is connected to the network, and the related personnel can directly download the operation data converted into the EXCEL file by using a computer in the office, thereby facilitating the production data management and editing into a brief report or a statistical chart.

In some embodiments, the program control box 950 is connected to a touch display screen (not shown). For example, the display screen may be disposed on a housing of a peak tin dipping machine (not shown) near the peak tin dipping oven 990. The display screen can display the instrument signal values of the program electric control box 950, and when any abnormal value is lower than the alarm set value, the alarm is immediately displayed to assist an operator to quickly find out and eliminate a fault source.

In addition. The tin furnace 200 for chemically purifying the solder dross is provided with a furnace pipe 215, a tin guide groove 230, a medicine mud guide groove 235, a stirring motor 263 and an over-temperature protection switch (not shown) of a cooling fan, which are in accordance with TUV European standards, and is automatically programmed by a program electric control box 950, so that the safety of operators can be guaranteed.

The operation of the apparatus 100 for chemically purifying and recycling solder dross will be described in detail with reference to fig. 1 to 3.

In step S801, the operator confirms whether or not the operation indicator lamp of the program electric control box 950 is on. The operation indicator lights are on to indicate that the temperature of the furnace bladder 215, the tin guiding groove 230, the slurry guiding groove 235, the stirring motor 263 and the cooling fan all reach the standard (for example, the temperature of the furnace bladder 215 is between 230 ℃ and 250 ℃), and the slurry collecting box 930, the plug 251, the solder residue blocking sheet 254, the stirring motor 263, the stirring blade 262 and the feeding conduit cover plate 272 are all in place, and the system is ready for solder residue purification and recovery. Initially, the outlet 215b, the side opening 220a and the inlet cover 272 are closed. In addition, the liquid solder is contained in the furnace tube 215, and the liquid surface thereof is higher than the bottom end of the purification round tube 220 and lower than the solder outlet 215 a.

In step S802, the operator presses the blue switch, and the feeding conduit cover 272 is pulled by the feeding conduit cover control cylinder 273 to rotate and open. An operator pours a fixed amount of purified powder (for example, two hundred to three hundred grams of AOP22S) into the material feeding conduit 271, the purified powder falls onto the solder liquid surface in the purification round tube 220, and presses the blue switch, so that the material feeding conduit cover plate 272 is pushed by the material feeding conduit cover plate control cylinder 273 to cover the material feeding conduit 271 in a rotating manner.

In step S803, the operator presses a stirring motor start button on the program electric control box 950. The stirring motor 263 automatically rotates ten to twenty circles, so that the feeding conduit cover plate 272 is automatically opened after the purified powder is dissolved in a liquid state.

In step S804, the operator adds a first scoop of solder dross (e.g., about six hundred grams of solder dross) from the wave solder dipping furnace, and then presses the blue switch to rotate the feeding conduit cover 272 to cover the feeding conduit 271. The tin slag reacts with the purified powder to generate liquid solder and liquid medicine floating in the liquid solder, and the liquid surface of the tin solder rises to exceed the tin outlet 215a and then flows out of the tin outlet 215a, and flows into the wave-crest tin dipping furnace 990 after flowing through the tin guiding groove 230. After ten to fifteen turns of stirring by the stirring blade 262, the feeding guide cover 272 is automatically lifted again, and a second scoop of solder dross can be added. After repeating the above-mentioned operation of adding the solder dross to the twentieth spoon, the stirring motor 263 is automatically stopped.

In step S805, twenty spoons of solder dross are added, and the purified powder has reacted completely, and the removal of the slurry is necessary. The buzzer sounds for three seconds to remind the operator to enter the mud stage of discharging the medicine. The cover 272 of the inlet conduit is not opened, and the outlet 215b and the side hole 220a are automatically opened.

In step S806, the stirring motor 263 rotates, the stirring blade 262 pushes out the medicine mud, and the medicine mud flows out from the medicine mud outlet 215b through the side hole 220a and the connecting pipe 225, flows through the medicine mud guiding groove 235, and then directly flows into the medicine mud collecting box 930. After about 120 seconds, the agitator motor 263 stops. The sludge outlet 215b and the side hole 220a are closed by the plug 251 and the solder dross stopper 254, respectively. After the above steps are finished, the PLC program automatically returns to the initial state of the program. The operator can move to the next chemical purification and recovery device 100 for solder dross, and then the operation of purification and recovery of solder dross is carried out again according to the above steps.

The slurry just discharged from the tin furnace 200 for chemically purifying the solder dross is in a high temperature liquid state, and an operator needs to wait for the slurry to be cooled and hardened (usually about one hour) before performing treatment. In addition, to prevent the medical mud from sticking to the medical mud collection box 930, in some embodiments, a regeneration paper box is placed in the medical mud collection box 930, the medical mud is contained in the regeneration paper box and does not directly contact the medical mud collection box 930, the medical mud is hardened and poured into the garbage bag with the air-sealable opening together with the regeneration paper box, and the opening of the garbage bag is sealed to prevent the medical mud hard block from deliquescing. In some embodiments, a rectangular heat sink hole (not shown) is disposed below the drug mud collection box 930 to assist in heat dissipation.

The chemical purification and recovery equipment 100 for soldering tin slag assists operators by utilizing PLC automatic control, greatly simplifies the purification and recovery operation of the soldering tin slag, is convenient to operate and can reduce artificial careless loss. Except that the steps of weighing to purify the powder, fishing out the tin slag by a wave crest tin dipping furnace, pressing a switch and the like need manual operation, the steps can be completed by PLC automatic control. By using the chemical purification and recovery device 100 for soldering tin slag, the operation of the wave crest soldering furnace is not affected when the soldering tin slag is purified, and on the contrary, the conventional soldering tin slag purification method is adopted, the wave crest soldering furnace needs to be stopped once every four hours, and the soldering tin slag are separated for at least fifty minutes, so that the efficiency is poor.

The "solder dross" material may be pure tin, pure lead, various tin-lead alloys, various tin-based alloys, various lead-based alloys, and is not limited to tin.

In addition, the solder dross may be taken from a lead dross tank or other equipment of a primary heat transfer circulation pipeline of various wave soldering furnaces, various soldering furnaces, lead-based nuclear reaction furnaces.

It should be understood that the materials and the dimensions, positions, times, etc. are merely exemplary and should not be construed as limiting the invention, which can be modified by those skilled in the art according to the actual requirements.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a soldering tin sediment chemical purification recovery plant, sets up in one side of crest tin dipping furnace, its characterized in that contains:

a base;

the soldering tin sediment chemical purification tin stove set up in on the base to contain:

a housing having a first side opening and a second side opening;

the furnace pipe is arranged in the shell, is provided with a tin outlet and a medicine mud outlet and is positioned at two adjacent sides of the furnace pipe;

the purification circular tube is arranged in the furnace pipe and is provided with a side hole;

the connecting pipe is connected with the medicine mud outlet and the side hole;

the tin guide groove is communicated with the tin outlet and extends to the upper part of the wave crest tin dipping furnace through the first side opening;

the medicinal mud guide groove is positioned below the medicinal mud outlet and extends out of the shell through the second side opening;

a pill outlet sealing mechanism configured to block the pill outlet and the side hole; and

a stirring mechanism, wherein the furnace and the purification round tube are configured to contain a liquid tin, and the stirring mechanism extends partially up and down through the liquid surface of the liquid tin; and

and the medicine mud collecting box is positioned below one end of the medicine mud guide groove, which is far away from the furnace pipe.

2. A chemical purification and recovery apparatus for dross soldering, as claimed in claim 1, wherein the chemical purification furnace further comprises:

the top cover covers the upper part of the shell and is provided with a feeding port, and the feeding port is aligned with the circular purification pipe;

the feeding guide pipe is connected with the feeding port;

a feeding conduit cover configured to cover an end of the feeding conduit remote from the top cover; and

and the feeding guide pipe cover plate control cylinder is provided with an actuating rod and is connected with the feeding guide pipe cover plate.

3. The chemical purification and recovery device for solder dross according to claim 1, wherein the stirring mechanism comprises:

a stirring shaft;

the stirring blade is connected with the stirring shaft and is positioned in the purification round pipe, and the stirring blade extends up and down to pass through the liquid surface; and

a stirring motor configured to drive the stirring shaft to rotate.

4. A chemical purification and recovery apparatus for dross soldering, as claimed in claim 1, wherein the chemical purification furnace further comprises:

the furnace heating plate is arranged in the shell and contacts the bottom of the furnace; and

and the heat insulation plates are arranged in the shell and surround the furnace pipe.

5. The chemical purification and recovery device for solder dross of claim 1, wherein the sealing mechanism for the opening for discharging the solder dross comprises:

a plug configured to plug the sludge outlet of the furnace;

a solder slag stopper configured to block the side hole of the circular purification tube;

the plug head driving cylinder is positioned on one side of the plug head, which is far away from the furnace pipe, and is connected with the plug head and the soldering tin slag blocking sheet; and

a drive cylinder support fixed to the housing, wherein the plug drive cylinder is disposed on the drive cylinder support.

6. The apparatus for chemically purifying and recycling dross soldering tin of claim 5, wherein the sealing mechanism of the dross discharging opening further comprises:

one end of each sliding rod is connected with the plug head;

the sliding rod seat is arranged on the driving cylinder bracket and is provided with two through holes, and the two sliding rods penetrate through the two through holes;

the plug head driving cylinder is provided with a driving rod, and the connecting seat is connected with the driving rod and the other ends of the two sliding rods; and

and the connecting rod is connected with the soldering tin slag blocking piece and the plug head.

7. A chemical purification and recovery apparatus for dross soldering furnace according to claim 5, wherein the chemical purification and recovery apparatus further comprises an extension tube communicating with the dross discharge port and having an abutting surface, and the plug has a flat surface configured to closely abut against the abutting surface of the extension tube.

8. A chemical purification and recovery apparatus for solder dross according to claim 1, wherein the chemical purification tin furnace further comprises a guide groove heating plate located below the flux guiding groove and abutting against the bottom surface of the flux guiding groove.

9. The apparatus of claim 1, wherein the tin guiding groove has a first extension portion and a second extension portion, the first extension portion extends away from the tin outlet, the second extension portion is connected to the first extension portion and extends toward the wave solder dipping furnace, and a width of the second extension portion is smaller than a width of the first extension portion.

10. An operation method for operating a tin dross chemical purification furnace, wherein the tin dross chemical purification furnace is disposed at one side of a wave soldering furnace, the tin dross chemical purification furnace comprises a furnace liner, a purification circular tube, a connecting tube and a tin guiding groove, wherein the furnace liner is provided with a tin outlet and a sludge outlet, the purification circular tube is disposed in the furnace liner and is provided with a side hole, the connecting tube connects the sludge outlet and the side hole, the tin guiding groove communicates with the sludge outlet and extends above the wave soldering furnace, the furnace liner contains tin liquid, and the liquid level of the tin liquid is higher than the bottom end of the side hole of the purification circular tube and lower than the tin outlet, the operation method comprises:

closing the medicine mud outlet and the side hole;

pouring the purified medicinal powder into the purification round tube;

stirring the purified medicinal powder to melt the purified medicinal powder into a liquid state;

taking out the tin soldering slag from the wave-crest tin dipping furnace, pouring the tin soldering slag into the purification round tube, wherein the tin soldering slag reacts with the purification powder to generate the tin soldering liquid and the medicine mud floating in the tin soldering liquid, and the tin soldering liquid is higher than the tin outlet in the liquid surface and then flows into the wave-crest tin dipping furnace through the tin guiding groove through the tin outlet;

opening the medicine mud outlet and the side hole; and

pushing the medicine mud, and collecting the medicine mud from the medicine mud outlet.