CN110788434A

CN110788434A - Wicking furnace

Info

Publication number: CN110788434A
Application number: CN201911116412.0A
Authority: CN
Inventors: 冯炜炜; 谢俊鸿; 王成东; 华徐立; 陈小娟; 周庆丰
Original assignee: Ningbo Hualian Electronic Science & Technology Co Ltd
Current assignee: Ningbo Hualian Electronic Science & Technology Co Ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-02-14

Abstract

The invention relates to a tin immersion furnace, which is characterized in that: including base (1), drive arrangement and heating furnace (2), heating furnace (2) upper end is equipped with storage tank (21) that hold soldering tin, heating furnace (2) set up in base (1) top, and drive arrangement is located the base, heating furnace (2) link to each other with drive arrangement and can reciprocate relative base (1) under the drive arrangement effect. This application adopts this kind of wicking stove, and the operation is adjusted very conveniently, adopts the wicking stove to carry out welding process in addition, and the tool of placing the circuit board can not reciprocate to avoided the tool to reciprocate rocking of production, improved PCBA welding quality.

Description

Wicking furnace

Technical Field

The invention relates to the technical field of PCBA production, in particular to a tin immersion furnace.

Background

Along with the continuous development of science and technology, the use of various electronic products is more and more common, and PCBA in-process electronic components pin need weld after inserting the circuit board, mostly adopts wave-soldering to carry out the soldering welding to electronic components and circuit connection position among the prior art. However, when wave soldering is used for soldering, if the wave peak is at the highest position, the oxidation amount of tin is very large, the production is not economical, and the maximum height of general wave soldering tin does not exceed 20mm, so that pins exceeding the size cannot be subjected to wave soldering, and the application range of the wave soldering is limited.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a tin immersion furnace which is convenient to adjust, economical to produce, and highly applicable.

In order to achieve the purpose, the technical scheme of the invention is as follows: a wicking furnace is characterized in that: the tin immersion furnace is connected with the driving device and can move up and down relative to the base under the action of the driving device.

Furthermore, the driving device comprises a first motor arranged on the base, a screw rod driven by the first motor and a transmission part in threaded connection with the screw rod, and the transmission part is fixedly connected with the heating furnace;

the transmission part can move up and down on the screw rod when the first motor drives the screw rod to rotate so as to drive the heating furnace to move up and down relative to the base.

Furthermore, the number of the screw rods is four, the screw rods are respectively arranged at four corners of the base, a connecting plate fixedly connected with the heating furnace through support columns is arranged below the heating furnace, the screw rods penetrate through the connecting plate and are in threaded connection with the connecting plate, and the connecting plate is the transmission part.

Furthermore, drive arrangement still includes and links to each other and can be established at the driven gear of lead screw lower extreme periphery and the cingulum that links to each other driving gear and driven gear by first motor drive's driving gear, fixed cover with first motor drive, the cingulum inboard is equipped with the interlock tooth that can mesh with driving gear and driven gear.

Furthermore, the driving gear is located the region that four lead screws enclose and close and form, the driving gear both sides are equipped with the belt pulley that links to each other and can rotate with the base, the belt pulley is located in the region and be in the driving gear rear, the cingulum is walked around driven gear outside, belt pulley trailing flank, driving gear leading flank in proper order and is driven gear rotation in order to realize the driving gear.

Furthermore, a sleeve is arranged on a position, where the lead screw penetrates through the connecting plate, of the lead screw, the lead screw is in threaded connection with the inner wall of the sleeve, the height of the sleeve is larger than the thickness of the connecting plate, the lower end of the sleeve extends out of the connecting plate to form a cap peak, and the cap peak and the connecting plate are fixed through screws.

Furthermore, two annular toothed chains which bypass the upper part of the heating furnace are arranged on the heating furnace, and a scraper of which the blade can be in contact with the soldering tin in the accommodating groove to clean an oxide layer on the surface of the soldering tin is arranged between the two toothed chains.

Furthermore, a positioning fork is arranged on the toothed chain, and two ends of the scraper are limited in the positioning fork so that the scraper can maintain balance.

Furthermore, the heating furnace is provided with a containing box for containing the scraper scraping materials on one side of the containing groove.

Further, a guide rail is arranged below the base, a guide groove is formed in the guide rail, a roller is arranged on the lower portion of the base, and the roller is located in the guide groove and can roll in the guide groove.

Compared with the prior art, the invention has the advantages that:

the tin immersion furnace can move up and down relative to the base, so that the tin immersion furnace can be conveniently controlled to lift up and down as required to perform tin soldering operation, the tin soldering is more convenient and uniform, meanwhile, the shaking caused by the up-and-down movement of the jig is avoided, and the welding quality is improved; the lead screw lifting adjustment mode has better stability and high control precision; the setting of scraper can effectively get rid of the oxide on soldering tin surface, improves welding quality, sets up the location fork, can reduce rocking of scraper, ensures that the scraper scrapes out oxide and impurity on soldering tin surface.

Drawings

Fig. 1 is a schematic structural view of the tin immersion furnace of the present application.

Fig. 2 is a schematic structural diagram of a base and related components of the present application.

Fig. 3 is a schematic view of a scraper and a positioning fork of the present application.

FIG. 4 is a schematic cross-sectional view of the connection position of the screw rod and the connection plate according to the present application.

Fig. 5 is an enlarged view of a portion a of fig. 3.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As shown in fig. 1 to 5, which are schematic structural diagrams of a preferred embodiment of the present invention, the wicking furnace includes a base 1, a heating furnace 2, and a driving device, wherein a receiving groove 21 for receiving solder is disposed at an upper end of the heating furnace 2, the heating furnace 2 is disposed above the base 1, the driving device is disposed on the base 1, and the heating furnace 2 is connected to the driving device and can move up and down relative to the base 1 under the action of the driving device. The accommodating groove 21 is filled with solder, the jig 900 for accommodating the circuit board is fixed on the claw chain 901 above the accommodating groove 21, and the claw chain 901 can move in the horizontal direction to drive the jig 900 to move in the horizontal direction.

In the production process, the heating furnace 2 heats and melts the soldering tin, then the driving device drives the heating furnace 2 to ascend, so that pins of electronic components on the circuit board placed on the jig 900 are immersed in the soldering tin, after the immersion time reaches a set value, the driving device enables the heating furnace 2 to descend, the pins of the electronic components are separated from the liquid level of the soldering tin, the claw chain 901 moves forwards, the next jig 900 is moved to the position above the accommodating groove 21, the heating furnace 2 ascends again to weld the current circuit board, and the process is repeated. Adopt this wicking stove production, convenient operation, degree of automation is high, and production process tool 900 can not reciprocate moreover, rocks when avoiding tool 900 to reciprocate and makes circuit board incline influence production quality.

In this embodiment, the driving device includes a first motor 12 disposed on the base 1, a screw rod 11 driven by the first motor 12, and a transmission member screwed on the screw rod 11, and the transmission member is fixedly connected to the heating furnace 2. When the first motor 12 drives the screw rod 11 to rotate, the transmission piece can move up and down relative to the screw rod 11, and the transmission piece is fixedly connected with the heating furnace 2, so that the transmission piece can drive the heating furnace 2 to move up and down together when moving, and further the heating furnace 2 can move up and down relative to the base 1.

In the present embodiment, the transmission member is the connection plate 22, specifically, the number of the screw rods 11 is four and is respectively arranged at four corners of the base 1, the connection plate 22 fixedly connected with the heating furnace 2 through the support columns 29 is arranged below the heating furnace, and the screw rods 11 penetrate through the connection plate 22 and are in threaded connection with the connection plate 22. The four screw rods 11 can be driven by the first motor 12 to synchronously rotate in the same direction relative to the connecting plate 22, and the lifting of the heating furnace 2 is controlled by the screw rods 11, so that the stability is good, and the control precision is high.

In order to enable the connection position of the screw rod 11 and the connecting plate 22 to be more stable and avoid shaking, a sleeve 23 is arranged on the position of the screw rod 11 penetrating through the connecting plate 22, the screw rod 11 is in threaded connection with the inner wall of the sleeve 23, the height of the sleeve 23 is larger than the thickness of the connecting plate 22, the lower end of the sleeve 23 extends out of the connecting plate 22 to form a cap peak 231, and the cap peak 231 and the connecting plate 22 are fixed through a screw 232, so that the threaded connection length between the screw rod 11 and the connecting plate 22 is longer, and the.

In this embodiment, the driving device further includes a driving gear 13 connected to the first motor 12 and capable of being driven by the first motor 12, a driven gear 14 fixedly sleeved on the outer periphery of the lower end of the screw rod 11, and a toothed belt 15 connecting the driving gear 13 and the driven gear 14, and engaging teeth capable of engaging with the driving gear 13 and the driven gear 14 are provided on the inner side of the toothed belt 15.

Preferably, the driving gear 13 is located in an area formed by enclosing the four screw rods 11, belt pulleys 16 which are connected with the base 1 and can rotate are arranged on two sides of the driving gear 13, the belt pulleys 16 are located in the area and behind the driving gear 13, the outer side of the toothed belt 15 is a smooth surface, and the toothed belt 15 sequentially bypasses the outer side of the driven gear 14, the rear side surface of the belt pulley 16 and the front side surface of the driving gear 13 so that the driving gear 13 drives the driven gear 14 to rotate.

The cingulum 15 adopts this kind to wind and establishes the mode, can make driving gear 13 and cingulum 15 meshing tooth number more, with the transmission power dispersion on more interlock teeth, avoids the deformation damage problem that a small amount of interlock tooth transmission brought to improve driving gear 13's life, also make the cingulum 15 more firm with the meshing between driving gear 13 simultaneously, prevent to slide the tooth and influence production quality.

In this embodiment, be equipped with two cyclic annular toothed chain 24 that bypass heating furnace 2 top on heating furnace 2, set up in storage tank 21 both sides separately, toothed chain 24 is rotated by the drive of second motor 25, be equipped with scraper 26 between two toothed chain 24, when scraper 26 is located the storage tank top, the cutting edge of scraper 26 can contact in order to clear away the oxide layer on soldering tin surface with the soldering tin in the storage tank 21, scrape out the oxide layer on soldering tin surface through setting up scraper 26, can improve the quality of wicking.

Specifically, the upper and lower sides of both ends of the heating furnace 2 are provided with rotating gears 27, the toothed chains 24 are engaged with the corresponding rotating gears 27, the scraper 26 is arranged between the two toothed chains 24, a rotating shaft 271 is arranged between the two rotating gears 27 on the lower side of one end, the second motor 25 is arranged on the connecting plate 22 below the rotating shaft 271, the second motor 25 is provided with a driving gear 251, the corresponding end of the rotating shaft 271 is provided with a transmission gear 272, and the transmission gear 272 is driven by the driving gear 251 to rotate through a chain 273. When the scraper 26 is required to scrape the oxide layer, the second motor 25 is started, the driving gear 251 drives the transmission gear 272 to rotate through the chain 273, so that the rotating shaft 271 rotates, the rotating gear 27 and the toothed chain 24 rotate under the driving of the rotating shaft 271, so that the scraper 26 moves to scrape the oxide layer on the surface of the soldering tin, and the scraper 26 moves along with the rotating path of the toothed chain 24.

Preferably, in order to ensure the scraping quality of the scraper 26, the toothed chain 24 is provided with a positioning fork 241, and both ends of the scraper 26 are limited in the positioning fork 241, so that the scraper 26 can be kept balanced and prevented from shaking, and the scraping quality of the scraper 26 can be ensured. As a further preference, the heating furnace 2 is provided with a storage box 28 for storing the scraped objects of the scraper 26 on the side of the storage groove 21 in front of the scraper 26 in the moving direction, and the storage box 28 is detachably arranged, so that the scraped objects cleaned by the scraper 26 can be prevented from falling on the ground, and the storage box 28 can be detached and inclined after being filled with the materials, and the use is very convenient.

In the embodiment, the guide rail 3 is arranged below the base 1, the guide groove 31 is arranged on the guide rail 3, the roller 17 is arranged on the lower portion of the base 1, and the roller 17 is located in the guide groove 31 and can roll in the guide groove 31, so that the tin dipping furnace is convenient to move, and the use is more convenient.

While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wicking furnace is characterized in that:

including base (1), drive arrangement and heating furnace (2), heating furnace (2) upper end is equipped with storage tank (21) that hold soldering tin, heating furnace (2) set up in base (1) top, and drive arrangement is located the base, heating furnace (2) link to each other with drive arrangement and can reciprocate relative base (1) under the drive arrangement effect.

2. The solder pot of claim 1, wherein:

the driving device comprises a first motor (12) arranged on the base (1), a screw rod (11) driven by the first motor (12) and a transmission piece in threaded connection with the screw rod (11), and the transmission piece is fixedly connected with the heating furnace (2);

the transmission piece can move up and down on the screw rod (11) when the first motor (12) drives the screw rod (11) to rotate so as to drive the heating furnace (2) to move up and down relative to the base.

3. The solder pot of claim 2, wherein:

the number of the screw rods (11) is four, the screw rods are respectively arranged at four corners of the base (1), a connecting plate (22) fixedly connected with the heating furnace (2) through supporting columns (29) is arranged below the heating furnace, the screw rods (11) penetrate through the connecting plate (22) and are in threaded connection with the connecting plate (22), and the connecting plate (22) is the transmission piece.

4. The solder pot of claim 3, wherein:

the driving device further comprises a driving gear (13) which is connected with the first motor (12) and can be driven by the first motor (12), a driven gear (14) which is fixedly sleeved on the periphery of the lower end of the screw rod (11) and a toothed belt (15) which connects the driving gear (13) with the driven gear (14), wherein meshing teeth which can be meshed with the driving gear (13) and the driven gear (14) are arranged on the inner side of the toothed belt (15).

5. The solder pot of claim 4, wherein:

the driving gear (13) is located the region that four lead screws (11) enclose and close and form, driving gear (13) both sides are equipped with belt pulley (16) that link to each other and can rotate with base (1), belt pulley (16) are located in the region and be located driving gear (13) rear, driven gear (14) outside, belt pulley (16) trailing flank, driving gear (13) leading flank are walked around in proper order in order to realize that driving gear (13) drives driven gear (14) and rotate in order to toothed belt (15).

6. The solder pot of claim 3, wherein:

the novel hat is characterized in that a sleeve (23) is arranged on a position, where the lead screw (11) penetrates through the connecting plate (22), of the lead screw (11), the lead screw (11) is in threaded connection with the inner wall of the sleeve (23), the height of the sleeve (23) is larger than the thickness of the connecting plate (22), the lower end of the sleeve stretches out of the connecting plate (22) to form a hat brim (231), and the hat brim (231) is fixed with the connecting plate (22) through screws (232).

7. A tin immersion furnace as claimed in any one of claims 1 to 6, wherein:

the heating furnace (2) is provided with two annular toothed chains (24) which bypass the upper part of the heating furnace (2), and a scraper (26) with a blade capable of contacting with the soldering tin in the accommodating groove (21) to clean an oxide layer on the surface of the soldering tin is arranged between the two toothed chains (24).

8. The solder pot of claim 7, wherein:

the toothed chain (24) is provided with a positioning fork (241), and two ends of the scraper (26) are limited in the positioning fork (241) to maintain the balance of the scraper (26).

9. The solder pot of claim 7, wherein:

and a storage box (28) for storing the scraped material of the scraper (26) is arranged on one side of the storage groove (21) of the heating furnace (2).

10. The solder pot of claim 1, wherein:

base (1) below is equipped with guide rail (3), be equipped with guide slot (31) on guide rail (3), base (1) lower part is equipped with gyro wheel (17), gyro wheel (17) are located guide slot (31) and can roll in guide slot (31).