CN113732425A

CN113732425A - Low-fluctuation tin furnace pump convenient to maintain and wave soldering tin furnace

Info

Publication number: CN113732425A
Application number: CN202110975902.7A
Authority: CN
Inventors: 徐光伟
Original assignee: Suzhou Hehe Automation Technology Co ltd
Current assignee: Suzhou Hehe Automation Technology Co ltd
Priority date: 2021-08-24
Filing date: 2021-08-24
Publication date: 2021-12-03

Abstract

The invention relates to a low-fluctuation wave soldering tin furnace convenient to maintain, which comprises a machine shell, a tin furnace inner container, a heating plate and a tin pumping cavity box, wherein the tin pumping cavity box is a soldering box body, the front side of the top of the tin pumping cavity box is provided with a tin outlet, the top of the tin pumping cavity box is provided with a nozzle assembly, the inlet of the nozzle assembly is communicated with the tin outlet, the rear side of the top of the tin pumping cavity box is provided with a pump hole, the bottom of the tin pumping cavity box right below the pump hole is provided with a tin inlet, the bottom of an impeller cover abuts against the bottom of the tin pumping cavity, the top of the machine shell is detachably and mechanically connected with a tin furnace pump fixing plate, a mounting seat of a tin furnace pump is arranged on the tin furnace pump fixing plate, the tin furnace inner container is internally provided with a thermocouple assembly, the machine shell is provided with an adjusting support, the adjusting support is provided with a driving motor, a main shaft of the driving motor is provided with a driving sprocket, a driven wheel is provided with a sprocket, and a transmission chain is connected between the driving sprocket and the driven wheel. The invention is convenient for maintenance at high temperature.

Description

Low-fluctuation tin furnace pump convenient to maintain and wave soldering tin furnace

Technical Field

The invention relates to the technical field of electronic welding equipment, in particular to a low-fluctuation tin furnace pump convenient to maintain and a wave soldering tin furnace.

Background

Jet wave soldering, also called as jet soldering and high-speed wave soldering, is applied to the field of through hole soldering of PCB plug-ins and equipment in the automotive electronics industry, and gradually becomes the popular trend of jet wave soldering in the field of PCB through hole soldering and transformer soldering in recent years due to different soldering advantages, and the application range is not limited to: and (3) welding the multilayer PCB through holes with high welding requirements and complex process, such as military electronics, space ship electronics, automotive electronics, digital cameras, printers and the like.

The manual welding can also realize the welding of the inserting parts, but the quality of the manual welding is too dependent on the working skill and proficiency of operators, the repeatability is poor, and the manual welding is not suitable for automatic production. In the above background, selective welding has been produced.

The tin furnaces for jet wave soldering on the market are low-temperature tin furnaces (less than 350 ℃), and with the continuous updating of electronic products, higher reliability, better high-temperature resistance and low-temperature resistance are required, the size is smaller and smaller, the requirement on the tin soldering is higher and higher, some transformer and inductance products need to adopt high-temperature jet wave soldering (less than 450 ℃), and the low-temperature tin furnaces on the market cannot meet the soldering requirement; high temperature jet solder tin furnaces are commonly used with equipment. The existing wave soldering tin furnace equipment needs to be maintained regularly, is difficult to clean after being used, needs to be cleaned after the tin furnace is cooled, and needs long time for maintenance.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a tin furnace pump with low fluctuation and convenient maintenance and a tin furnace.

The technical scheme adopted by the invention for solving the technical problems is as follows: a low-fluctuation tin furnace pump convenient to maintain comprises a mounting seat, a bearing seat arranged at the top of the mounting seat, a transmission shaft arranged in the bearing seat, an impeller arranged at the bottom of the transmission shaft, a driven wheel arranged at the top of the transmission shaft, and a bearing body arranged in the bearing seat and connected with the transmission shaft, wherein an impeller cover is arranged at the bottom of the mounting seat, the impeller cover is provided with a partition board which divides the impeller cover into an overflow cavity and a tin pumping cavity from top to bottom, the partition board is provided with a through hole convenient for the transmission shaft to pass through, the impeller is arranged in the tin pumping cavity, the impeller cover around the tin pumping cavity is provided with notches, the notches are distributed around the axis of the transmission shaft in an annular array manner, the notches extend spirally along the axis direction of the impeller cover, and the impeller comprises an impeller top plate and blades arranged at the bottom of the impeller top plate, the blades extend downwards from the bottom of the impeller top plate, the projection extending direction of the blades in the horizontal plane is tangent to the circumferential surface of the transmission shaft, namely the rotating direction of tin liquid in the impeller cover is opposite to the spiral direction of the notch, and the bottom of the impeller cover is provided with an opening.

Utilize in the above-mentioned design to set up the breach and the blade cooperation of spiral on the impeller cover, under the condition that increases the breach, promote the stationarity that tin liquid pumped out, the clearance is convenient for take out whole tin pump to the vertical setting of blade simultaneously, and the clearance is convenient.

As a further improvement of the design, the side surface of the overflow cavity is provided with an overflow hole which penetrates through the impeller cover, and the mounting seat is provided with a second air inlet hole which penetrates through the mounting seat and is communicated with the overflow cavity. The overflow hole and the second air inlet hole are convenient for filling nitrogen into the impeller cover, so that the temperature of the transmission shaft is reduced, and the tin liquid in the impeller cover is protected from being oxidized.

As a further improvement of the design, the bearing seat is connected with the mounting seat through an upright post, and a gap is reserved between the bottom of the bearing seat and the top of the mounting seat. The stand is convenient for separate bearing frame and mount pad, reduces heat and spreads into the bearing into, effectively improves bearing life.

As a further improvement of the design, a bearing cavity which is convenient for containing the bearing body is arranged in the bearing seat, a ventilation groove which extends along a bearing cavity bus is arranged on the peripheral surface of the bearing cavity, and a first air inlet hole communicated with the bearing cavity is formed in the top of the bearing seat. The ventilation groove and the first air inlet hole are convenient for cooling the bearing, and the service life of the bearing is further prolonged.

As a further improvement of the design, the bearing seat is internally provided with two bearing bodies, the two bearing bodies are respectively arranged at the upper end and the lower end of the bearing cavity, the transmission shaft is sleeved with a shaft sleeve, the two ends of the shaft sleeve respectively support the two bearing bodies, the upper end and the lower end of the bearing cavity are provided with limiting rings, the top of the bearing body supports the bottom of the limiting ring at the top of the bearing cavity, and the bottom of the bearing body supports the top of the limiting ring at the bottom of the bearing cavity. Spacing ring and axle sleeve are convenient for promote the bearing frame inner space, promote the cooling effect, improve the support to the transmission shaft simultaneously, offset the torsion that the transmission shaft received.

As a further improvement of the design, the installation seat is provided with an arc hole which penetrates through the installation seat from top to bottom, one end of the arc hole is provided with an avoidance hole which penetrates through the installation seat from top to bottom, and the avoidance hole is convenient for the installation bolt on the installation seat to integrally penetrate. The arc-shaped hole and the avoiding hole are convenient for quickly disassembling the tin furnace pump under the high-temperature condition, and the maintenance time is shortened.

A low-fluctuation wave soldering tin furnace convenient to maintain comprises a machine shell, a tin furnace inner container arranged in the machine shell, a heating plate arranged at the bottom of the tin furnace inner container, and a tin pumping cavity box arranged in the tin furnace inner container, wherein the tin pumping cavity box is a soldering box body internally provided with a tin pumping cavity, the top of the tin furnace inner container is open, the front side of the top of the tin pumping cavity box is provided with a tin outlet hole communicated with the tin pumping cavity, the top of the tin pumping cavity box is provided with a nozzle assembly, the inlet of the nozzle assembly is communicated with the tin outlet hole, the rear side of the top of the tin pumping cavity box is provided with a pump hole convenient for an impeller cover to extend into the tin pumping cavity, the bottom of the tin pumping cavity box under the pump hole is provided with a tin inlet hole communicated with the tin pumping cavity, the bottom of the impeller cover abuts against the bottom of the tin pumping cavity, the top of the machine shell is detachably and mechanically connected with a tin furnace pump fixing plate, the mounting seat of the tin furnace pump is arranged on the tin furnace pump fixing plate, a thermocouple assembly is arranged in the tin furnace inner container, an adjusting support is arranged on the casing, a driving motor is arranged on the adjusting support, a driving sprocket is arranged on a main shaft of the driving motor, the driven wheel is a sprocket wheel, and a transmission chain is connected between the driving sprocket wheel and the driven wheel.

Through the cooperation of tin stove pump and hollow pump tin cavity box in above-mentioned design, avoid setting up the runner in pump tin cavity box, the clearance of the pump tin cavity box of being convenient for adopts drive chain transmission, and the durability is better.

As a further improvement of the design, the top of the shell at the rear side of the tin furnace pump fixing plate is detachably and mechanically connected with a detection fixing plate, the detection fixing plate covers the top opening of the tin furnace liner at the rear side of the tin furnace pump fixing plate, and the thermocouple assembly is arranged on the detection fixing plate. The detection fixing plate and the tin furnace pump fixing plate which are detachably connected are convenient for quickly taking out and cleaning the tin pump cavity box.

As a further improvement of the design, the tin stove pump fixed plate front side be equipped with the protection gas cover on the casing, the protection gas cover covers tin stove pump fixed plate front side tin stove inner bag open-top, the protection gas cover top is equipped with and is convenient for dodge the mouth of dodging of nozzle assembly export, be equipped with protection gas filter element pipe in the protection gas cover, the protection gas cover left and right sides is equipped with the couple, be equipped with on the casing with couple complex spring type hasp. The protection gas cover realizes quick assembly disassembly through the spring type hasp, shortens the maintenance time, and easy dismounting, protection gas filter core pipe are convenient for provide good protection gas atmosphere for the protection gas cover.

As a further improvement of the design, a nitrogen heating pipe is arranged on the shell, and nitrogen enters the protective gas filter element pipe after being heated by the nitrogen heating pipe. Through nitrogen heating pipe heats nitrogen gas for the nitrogen gas source of settlement temperature, can effectually avoid cold nitrogen gas to the influence of crest temperature, form, further guarantee soldering tin quality. Liquid tin at the nozzle of the nozzle assembly is wrapped by nitrogen, and the wave crest is not impacted while tin soldering is protected.

As a further improvement of the design, the side face of the machine shell is provided with a line concentration box, the line concentration box is provided with an electric plug and a bus plug, the bus plug is electrically connected with the electric plug, and the electric plug is respectively electrically connected with each electric appliance and the sensor on the tin furnace. The electric plug is convenient for change each electrical apparatus and sensor alone, reduces maintenance duration.

As a further improvement of the design, the top of the tin pumping cavity box at the rear of the left side and the right side of the nozzle assembly is provided with a guide seat, the guide seat is provided with a pressing claw which slides along the front and the rear of the guide seat, the top of the guide seat is provided with a fastening bolt, the pressing claw is provided with a waist-shaped hole which extends from front to back, the fastening bolt penetrates through the waist-shaped hole from top to bottom, the front end of the pressing claw is pressed at the top of the left side and the right side of the nozzle assembly, and the head of the bolt is pressed at the top of the pressing claw. The nozzle assembly is convenient to disassemble and assemble quickly at high temperature, and the maintenance time is reduced.

The invention has the beneficial effects that:

1. utilize the breach and the blade cooperation that set up the spiral on the impeller cover, under the condition that increases the breach, promote the stationarity that the tin liquor was pumped out, the clearance is convenient for take out whole tin stove pump to the vertical setting of blade simultaneously, and the clearance is convenient.

2. Through the cooperation of the tin furnace pump and the hollow tin cavity box, a flow channel is prevented from being arranged in the tin cavity box, the tin cavity box is convenient to clean, transmission chain transmission is adopted, and the durability is better.

3. The pump tin cavity box is formed by welding, and the time for disassembling and cleaning by personnel is greatly reduced.

4. Various connecting wires on the tin furnace are collected in the wire collecting box, so that the maintenance in the later period is very convenient.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic perspective view of a solder pump according to the present invention.

FIG. 2 is a schematic cross-sectional view of the entire pump of the tin furnace of the present invention.

FIG. 3 is a schematic view of the overall structure of the tin furnace of the present invention.

FIG. 4 is a schematic view of the overall structure of the tin furnace without a protective gas hood according to the present invention.

FIG. 5 is a schematic top perspective view of a combination of a tin pumping cavity box and a tin furnace pump according to the present invention.

FIG. 6 is a schematic view of a bottom perspective structure of a combination of a tin pumping cavity box with a hollow bottom and a tin furnace pump according to the present invention.

FIG. 7 is a schematic view of the overall cross-sectional structure of the tin furnace of the present invention.

In the figure, 1, a machine shell, 2, a tin furnace pump fixing plate, 3, a thermocouple assembly, 4, a nitrogen heating pipe, 5, a detection fixing plate, 6, an electrical plug, 7, a wire collecting box, 8, a bus plug, 9, an adjusting support, 10, a driving chain wheel, 11, a nozzle assembly, 12, an avoidance port, 13, a protective gas cover, 14, a hook, 15, a spring type buckle, 16, a tin furnace pump, 17, a transmission chain, 18, a driving motor, 19, a guide seat, 20, a pressing claw, 21, a waist-shaped hole, 22, a fastening bolt, 23, a notch, 24, an overflow hole, 25, a stand column, 26, a driven wheel, 27, a bearing seat, 28, a tin furnace pump fixing plate, 29, an impeller cover, 30, an impeller, 31, a pump tin cavity, 32, a tin outlet hole, 33, a partition plate, 34, a shaft sleeve, 35, an impeller transmission shaft, 36, a bearing body, 37, a limiting ring, 38, a ventilation groove, 39, a through hole, 40, a top plate, 41. the tin furnace comprises a blade, 42, a second air inlet hole, 43, a first air inlet hole, 44, an arc-shaped hole, 45, a relief hole, 46, a mounting bolt, 47, a tin furnace inner container, 48, a heating plate, 49, a tin pumping cavity box, 50, a pumping hole, 51, a tin inlet hole, 52, a protective gas filter core pipe and 53, a bearing cavity.

Detailed Description

The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.

Example (b): a low-fluctuation tin furnace pump 16 convenient to maintain comprises a tin furnace pump fixing plate 28, a bearing seat 27 arranged at the top of the tin furnace pump fixing plate 28, an impeller transmission shaft 35 arranged in the bearing seat 27, an impeller 30 arranged at the bottom of the impeller transmission shaft 35, a driven wheel 26 arranged at the top of the impeller transmission shaft 35, a bearing body 36 arranged in the bearing seat 27 and connected with the impeller transmission shaft 35, an impeller cover 29 arranged at the bottom of the tin furnace pump fixing plate 28, the impeller cover 29 is provided with a partition plate 33 for vertically dividing the impeller cover 29 into an overflow cavity and a pump tin cavity 31, the partition plate 33 is provided with a through hole 39 convenient for the impeller transmission shaft 35 to pass through, the impeller 30 is arranged in the pump tin cavity 31, notches 23 are arranged on the impeller cover 29 around the pump tin cavity 31, and the notches 23 are distributed around the axis of the impeller transmission shaft 35 in an annular array manner, the notch 23 extends spirally along the axial direction of the impeller cover 29, the impeller 30 includes an impeller top plate 40 and a blade 41 disposed at the bottom of the impeller top plate 40, the blade 41 extends downward from the bottom of the impeller top plate 40, the projection extending direction of the blade 41 in the horizontal plane is tangent to the peripheral surface of the impeller transmission shaft 35, that is, the rotating direction of the tin liquid in the impeller cover 29 is opposite to the spiral direction of the notch 23, and the bottom of the impeller cover 29 is open.

Utilize setting up spiral breach 23 and the cooperation of blade 41 on the impeller casing 29 in the above-mentioned design, under the condition that increases breach 23, promote the stationarity that the tin liquid was pumped out, the vertical setting of blade 41 is convenient for take out the clearance with whole tin pump simultaneously, and the clearance is convenient.

As a further improvement of the design, the lateral surface of the overflow cavity is provided with an overflow hole 24 which penetrates through the impeller cover 29, and the tin furnace pump fixing plate 28 is provided with a second air inlet hole 42 which penetrates through the tin furnace pump fixing plate 28 and is communicated with the overflow cavity. The overflow holes 24 and the second air inlet holes 42 are convenient for filling nitrogen into the impeller cover 29, cooling the impeller transmission shaft 35 and protecting the tin liquid in the impeller cover 29.

As a further improvement of the design, the bearing seat 27 is connected with the tin furnace pump fixing plate 28 through an upright post 25, and a gap is reserved between the bottom of the bearing seat 27 and the top of the tin furnace pump fixing plate 28. The upright column 25 is convenient for separating the bearing seat 27 from the tin furnace pump fixing plate 28, reduces heat transfer into the bearing, and effectively prolongs the service life of the bearing.

As a further improvement of the design, a bearing cavity 53 is arranged in the bearing seat 27 for accommodating the bearing body 36, a ventilation groove 38 extending along a generatrix of the bearing cavity 53 is arranged on the peripheral surface of the bearing cavity 53, and a first air inlet hole 43 communicated with the bearing cavity 53 is arranged at the top of the bearing seat 27. The ventilation slot 38 and the first air inlet hole 43 facilitate cooling of the bearing, further improving the service life of the bearing.

As a further improvement of the design, two bearing bodies 36 are arranged in the bearing seat 27, the two bearing bodies 36 are respectively arranged at the upper end and the lower end of the bearing cavity 53, a shaft sleeve 34 is sleeved on the impeller transmission shaft 35, the two ends of the shaft sleeve 34 respectively abut against the two bearing bodies 36, a limit ring 37 is arranged at the upper end and the lower end of the bearing cavity 53, the top of the bearing body 36 abuts against the bottom of the limit ring 37 at the top of the bearing cavity 53, and the bottom of the bearing body 36 abuts against the top of the limit ring 37 at the bottom of the bearing cavity 53. The limiting ring 37 and the shaft sleeve 34 are convenient for lifting the inner space of the bearing seat 27, the cooling effect is improved, meanwhile, the support for the impeller transmission shaft 35 is improved, and the torsion force borne by the impeller transmission shaft 35 is offset.

As a further improvement of the present design, the arc hole 44 penetrating through the tin furnace pump fixing plate 28 from top to bottom is formed in the tin furnace pump fixing plate 28, the avoiding hole 45 penetrating through the tin furnace pump fixing plate 28 from top to bottom is formed in one end of the arc hole 44, and the installing bolt 46 on the tin furnace pump fixing plate 28 conveniently penetrates through the avoiding hole 45. The arc-shaped holes 44 and the avoidance holes 45 are convenient for quickly disassembling the tin furnace pump 16 under the high-temperature condition, and the maintenance time is shortened.

A wave soldering tin furnace with low fluctuation and convenient maintenance comprises a machine shell 1, a tin furnace inner container 47 arranged in the machine shell 1, a heating plate 48 arranged at the bottom of the tin furnace inner container 47, and a tin pumping cavity box 49 arranged in the tin furnace inner container 47, wherein the tin pumping cavity box 49 is a welding box body internally provided with a tin pumping cavity 31, the top of the tin furnace inner container 47 is open, the front side of the top of the tin pumping cavity box 49 is provided with a tin outlet 32 communicated with the tin pumping cavity 31, the top of the tin pumping cavity box 49 is provided with a nozzle assembly 11, the inlet of the nozzle assembly 11 is communicated with the tin outlet 32, the rear side of the top of the tin pumping cavity box 49 is provided with a pump hole 50 convenient for the impeller cover 29 to extend into the tin pumping cavity 31, the bottom of the tin pumping cavity box 49 under the pump hole 50 is provided with a tin inlet 51 communicated with the tin pumping cavity 31, the bottom of the impeller cover 29 is abutted against the bottom of the tin pumping cavity 31, the tin furnace pump fixing plate 2 is detachably and mechanically connected to the top of the machine shell 1, the tin furnace pump fixing plate 28 of the tin furnace pump 16 is arranged on the tin furnace pump fixing plate 2, the thermocouple assembly 3 is arranged in the tin furnace inner container 47, the machine shell 1 is provided with an adjusting support 9, the adjusting support 9 is provided with a driving motor 18, a main shaft of the driving motor 18 is provided with a driving sprocket 10, the driven wheel 26 is a sprocket, and a transmission chain 17 is connected between the driving sprocket 10 and the driven wheel 26.

Through the cooperation of tin stove pump 16 and hollow pump tin cavity box 49 in the above-mentioned design, avoid setting up the runner in pump tin cavity box 49, the clearance of pump tin cavity box 49 of being convenient for adopts drive chain 17 transmission, and the durability is better.

As a further improvement of the design, the top of the shell 1 at the rear side of the tin furnace pump fixing plate 2 is detachably and mechanically connected with a detection fixing plate 5, the detection fixing plate 5 covers the top opening of the tin furnace inner container 47 at the rear side of the tin furnace pump fixing plate 2, and the thermocouple assembly 3 is arranged on the detection fixing plate 5. The detachably connected tin furnace pump fixing plate 2 is convenient for quickly taking out and cleaning the tin pump cavity box 49.

As a further improvement of this design, 2 front sides of tin stove pump fixed plate be equipped with protective gas cover 13 on casing 1, protective gas cover 13 covers 2 front sides of tin stove pump fixed plate 47 open-top of the tin stove, protective gas cover 13 top is equipped with and is convenient for dodge mouth 12 is dodged to nozzle assembly 11 export, be equipped with protective gas filter core pipe 52 in the protective gas cover 13, the protective gas cover 13 left and right sides is equipped with couple 14, be equipped with on casing 1 with 14 complex spring type hasp 15 of couple. The protective gas cover 13 is quickly disassembled and assembled through the spring type hasps 15, the maintenance time is shortened, the disassembly and the assembly are convenient, and the protective gas filter element tube 52 is convenient to provide a good protective gas atmosphere for the protective gas cover 13.

As a further improvement of the design, a nitrogen heating pipe 4 is arranged on the casing 1, and nitrogen enters the protective gas filter element pipe 52 after being heated by the nitrogen heating pipe 4. Through nitrogen heating pipe 4 heats nitrogen gas for the nitrogen gas source of settlement temperature, can effectually avoid cold nitrogen gas to the influence of crest temperature, form, further guarantee soldering tin quality. Liquid tin at the nozzle of the nozzle assembly 11 is wrapped by nitrogen, and the wave crest is protected from being impacted while soldering tin is protected.

As a further improvement of the design, a line concentration box 7 is arranged on the side face of the machine shell 1, an electric plug 6 and a bus plug 8 are arranged on the line concentration box 7, the bus plug 8 is electrically connected with the electric plug 6, and the electric plug 6 is respectively electrically connected with each electric appliance and a sensor on the tin furnace. The electric plug 6 is convenient for independently replacing each electric appliance and each sensor, and the maintenance time is reduced.

As a further improvement of the design, the guide seat 19 is arranged at the top of the pump tin cavity box 49 at the rear of the left side and the right side of the nozzle assembly 11, the pressing claw 20 sliding back and forth along the guide seat 19 is arranged on the guide seat 19, the fastening bolt 22 is arranged at the top of the guide seat 19, the waist-shaped hole 21 extending back and forth is arranged on the pressing claw 20, the fastening bolt 22 penetrates through the waist-shaped hole 21 up and down, the front end of the pressing claw 20 is pressed at the top of the left side and the right side of the nozzle assembly 11, and the bolt head is pressed at the top of the pressing claw 20. Being convenient for quick assembly disassembly nozzle assembly 11 under the high temperature reduces the maintenance duration.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A low-fluctuation tin furnace pump convenient to maintain comprises a mounting seat, a bearing seat arranged at the top of the mounting seat, a transmission shaft arranged in the bearing seat, an impeller arranged at the bottom of the transmission shaft, a driven wheel arranged at the top of the transmission shaft, and a bearing body arranged in the bearing seat and connected with the transmission shaft, and is characterized in that an impeller cover is arranged at the bottom of the mounting seat, the impeller cover is provided with a partition plate which vertically divides the impeller cover into an overflow cavity and a tin pump cavity, the partition plate is provided with a through hole convenient for the transmission shaft to pass through, the impeller is arranged in the tin pump cavity, the impeller cover around the tin pump cavity is provided with notches, the notches are distributed around the axis of the transmission shaft in an annular array manner, the notches extend spirally along the axis direction of the impeller cover, and the impeller comprises an impeller top plate and blades arranged at the bottom of the impeller top plate, the blades extend downwards from the bottom of the impeller top plate, the projection extending direction of the blades in the horizontal plane is tangent to the circumferential surface of the transmission shaft, namely the rotating direction of tin liquid in the impeller cover is opposite to the spiral direction of the notch, and the bottom of the impeller cover is provided with an opening.

2. A low fluctuation easy maintenance tin furnace pump as claimed in claim 1, wherein said overflow chamber has an overflow hole through the side of said impeller cover, and said mounting seat has a second air inlet hole through said mounting seat and communicating with said overflow chamber.

3. A low ripple easy to maintain tin furnace pump as claimed in claim 1, wherein the bearing seat is connected with the mounting seat by a column, and a gap is left between the bottom of the bearing seat and the top of the mounting seat.

4. A low fluctuation easy maintenance tin furnace pump as claimed in claim 3, wherein the bearing housing is provided with a bearing cavity for accommodating the bearing body, the circumferential surface of the bearing cavity is provided with a ventilation groove extending along the generatrix of the bearing cavity, and the top of the bearing housing is provided with a first air inlet communicated with the bearing cavity.

5. A low fluctuation easy maintenance tin furnace pump as claimed in claim 4, wherein two bearing bodies are provided in said bearing housing, two said bearing bodies are provided at the upper and lower ends of said bearing cavity, respectively, said transmission shaft is sleeved with a shaft sleeve, said shaft sleeve ends respectively abut against two said bearing bodies, said upper and lower ends of said bearing cavity are provided with a spacing ring, the top of said bearing body above abuts against the bottom of said spacing ring at the top of said bearing cavity, and the bottom of said bearing body below abuts against the top of said spacing ring at the bottom of said bearing cavity.

6. A low-fluctuation easy-to-maintain tin furnace pump as claimed in any one of claims 1 to 5, wherein the mounting base is provided with an arc hole which penetrates through the mounting base from top to bottom, one end of the arc hole is provided with an avoiding hole which penetrates through the mounting base from top to bottom, and the avoiding hole is convenient for the mounting bolt on the mounting base to pass through as a whole.

7. A tin furnace provided with a tin furnace pump as claimed in claim 1, which is characterized by comprising a machine shell, a tin furnace inner container arranged in the machine shell, a heating plate arranged at the bottom of the tin furnace inner container, and a tin pumping cavity box arranged in the tin furnace inner container, wherein the tin pumping cavity box is a welding box body internally provided with a tin pumping cavity, the top of the tin furnace inner container is open, the front side of the top of the tin pumping cavity box is provided with a tin outlet communicated with the tin pumping cavity, the top of the tin pumping cavity box is provided with a nozzle assembly, the inlet of the nozzle assembly is communicated with the tin outlet, the rear side of the top of the tin pumping cavity box is provided with a pump hole convenient for the impeller cover to extend into the tin pumping cavity, the bottom of the tin pumping cavity is provided with a tin inlet communicated with the tin pumping cavity, the bottom of the impeller cover abuts against the bottom of the tin pumping cavity, the top of the machine shell is detachably and mechanically connected with a tin furnace pump fixing plate, the mounting seat of the tin furnace pump is arranged on the tin furnace pump fixing plate, a thermocouple assembly is arranged in the tin furnace inner container, an adjusting support is arranged on the casing, a driving motor is arranged on the adjusting support, a driving sprocket is arranged on a main shaft of the driving motor, the driven wheel is a sprocket wheel, and a transmission chain is connected between the driving sprocket wheel and the driven wheel.

8. The solder pot of claim 7, wherein a detection fixing plate is detachably and mechanically connected to the top of the casing at the rear side of the solder pot pump fixing plate, the detection fixing plate covers an opening at the top of the solder pot liner at the rear side of the solder pot pump fixing plate, and the thermocouple assembly is disposed on the detection fixing plate.

9. The tin furnace of claim 7, wherein a shielding gas hood is arranged on the casing in front of the tin furnace pump fixing plate, the shielding gas hood covers the opening at the top of the tin furnace inner container in front of the tin furnace pump fixing plate, an avoiding opening for avoiding the outlet of the nozzle assembly is arranged at the top of the shielding gas hood, a shielding gas filter core pipe is arranged in the shielding gas hood, hooks are arranged on the left side and the right side of the shielding gas hood, and a spring type hasp matched with the hooks is arranged on the casing.

10. The tin furnace of claim 9, wherein the casing is provided with a nitrogen heating pipe, and nitrogen is heated by the nitrogen heating pipe and enters the protective gas filter element pipe.

11. The tin furnace of claim 7, wherein a junction box is disposed on a side of the casing, an electrical plug and a bus plug are disposed on the junction box, the bus plug is electrically connected to the electrical plug, and the electrical plug is electrically connected to each electrical appliance and each sensor on the tin furnace.

12. The low-fluctuation easy-maintenance tin furnace as claimed in claim 7, wherein a guide seat is arranged at the top of the tin pumping cavity box at the rear of the left side and the right side of the nozzle assembly, a pressing claw sliding back and forth along the guide seat is arranged on the guide seat, a fastening bolt is arranged at the top of the guide seat, a waist-shaped hole extending back and forth is arranged on the pressing claw, the fastening bolt penetrates through the waist-shaped hole up and down, the front end of the pressing claw is pressed at the top of the left side and the right side of the nozzle assembly, and the head of the bolt is pressed at the top of the pressing claw.