A vacuum furnace equipment for reflow soldering machine

Abstract

A vacuum furnace device for a reflow soldering machine comprises a frame (1), a lower furnace body (2), an upper furnace body (3) and a furnace conveying assembly (4); the lower furnace body (2) and the furnace conveying assembly (4) are respectively provided at both ends of the frame (1) and cooperate with each other; it also comprises a furnace material shifting assembly (5), an upper furnace body lifting assembly (6) and an upper furnace body heating assembly (7); the outer wall of the top plate of the upper furnace body (3) is provided with a plurality of grids (19). During use, the present invention can improve the yield rate of the existing reflow soldering machine in production by improving the stroke accuracy when feeding workpieces, performing heating temperature compensation on the vacuum furnace body and other methods.

Description

Technical Field

[0001] The invention relates to the technical field of reflow soldering machines, in particular to vacuum furnace equipment for reflow soldering machines. Background Art

[0002] In current industrial production, reflow soldering machines are often used to perform reflow soldering operations on PCB circuit boards, among which the vacuum furnace is the core functional component of the reflow soldering machine.

[0003] However, the existing vacuum furnace has many shortcomings. For example, in the existing reflow soldering machine, the PCB circuit board needs to be preheated before being sent into the vacuum furnace by the furnace conveying component. However, at a higher temperature, it is easy to have insufficient friction between the furnace conveying component and the PCB circuit board. For example, the board introduction device of the reflow soldering machine disclosed in a furnace conveying component patent applied by the applicant before the application date (patent application number is 200820046891.4) has a reduced friction coefficient of the chain under ultra-high temperature conditions, resulting in reduced friction between the chain and the PCB circuit board, and ultimately causing the problem of incorrect travel of the PCB circuit board.

[0004] Therefore, the prior art needs to be improved and enhanced. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a vacuum furnace device for a reflow soldering machine.

[0006] The present invention provides the following technical solutions:

[0007] A vacuum furnace device for a reflow soldering machine comprises a frame (1), a lower furnace body (2), an upper furnace body (3) and a furnace conveying assembly (4); the lower furnace body (2) and the furnace conveying assembly (4) are respectively provided at two ends of the frame (1); the frame (1) further comprises a furnace shifting assembly (5), an upper furnace body lifting assembly (6) and an upper furnace body heating assembly (7); the furnace shifting assembly (5) cooperates with the furnace conveying assembly (4) and comprises a linear module (8), a first base (9), a first motor (10) and a shifting rod (11); the linear module (8) is fixed to the frame (1), and the linear module (8) drives the first base (9) to move along the furnace conveying assembly (4) The first base (9) is provided with the first motor (10), and the first motor (10) drives the material-moving rod (11) to rotate; the upper furnace body lifting assembly (6) comprises a transverse plate (12), a gantry (13), a top rod (14), a connecting plate (15), a first screw nut (16), a first screw rod (17) and a second motor (18); the transverse plate (12) is provided on the frame (1), and is located below the lower furnace body (2); two gantries (13) are symmetrically provided on the transverse plate (12), and the two gantries (13) are respectively located on both sides of the lower furnace body (2); a top plate of each gantry (13) is movably penetrated The push rod (14); the middle part of the push rod (14) is fixedly connected to the connecting plate (15), and the connecting plate (15) is also provided with the first screw nut (16); each first screw nut (16) is threadedly matched with a first screw (17), and each first screw (17) is driven by the second motor (18) arranged on the horizontal plate (12); the outer wall of the top plate of the upper furnace body (3) is provided with a plurality of grids (19); the side walls of both sides of the upper furnace body (3) are connected to the connecting blocks (20); the connecting blocks (20) are connected to the push rod (14) of the upper furnace body lifting assembly (6); the upper furnace body heating assembly (7) is located on the upper part of the upper furnace body (3) The invention relates to a machine frame (1), comprising a shell (21), an air guide plate (22), a wind shield (23), a circulating air duct (24), a first heating component (25) and a circulating fan (26); the shell (21) is arranged on the frame (1), and the bottom of the shell (21) is provided with the air guide plate (22); the air guide plate (22) is provided with a plurality of air holes (27) which are connected to the grid (19); the air guide plate (22) and the wind shield (23) arranged on its upper wall form a cavity; the cavity is equipped with the first heating component (25); the air inlet and the air outlet of the circulating air duct (24) are respectively connected to the two side ends of the cavity; the circulating air duct (24) is equipped with the circulating fan (26).

[0008] Preferably, a first synchronous wheel (28) is mounted on the output shaft of the second motor (18); a rotating shaft is rotatably connected to the transverse plate (12); two ends of the rotating shaft are respectively connected to a second synchronous wheel (29) and a third synchronous wheel (30); the second synchronous wheel (29) and the first synchronous wheel (28) are driven by a first synchronous belt (31); a fourth synchronous wheel (32) is provided at the bottom end of each of the first screw rods (17); all of the fourth synchronous wheels (32) and the third synchronous wheels (30) are driven by a second synchronous belt (33).

[0009] Preferably, a second heating assembly (34) is provided on the side wall of the lower furnace body (2); and a third heating assembly (35) is provided at the bottom of the lower furnace body (2).

[0010] Preferably, the upper and lower sides of the furnace conveying assembly (4) are respectively equipped with a fourth heating assembly (36) and a fifth heating assembly (37).

[0011] Preferably, an adjustable guide rail assembly is further provided in the lower furnace body (2), and the adjustable guide rail assembly includes a second base (38), a third base (39), a second screw rod (40), a second screw rod nut (41), a slide plate (42) and a workpiece conveying guide rail (43); the second base (38) and the third base (39) are relatively mounted in the lower furnace body (2); the two ends of the second screw rod (40) are rotatably connected to the second base (38) and the third base (39), respectively, the second screw rod (40) is threadedly engaged with the second screw rod nut (41), and the second screw rod nut (41) is fixedly connected to the slide plate (42); and one of the workpiece conveying guide rails (43) is respectively provided on the second base (38) and the slide plate (42).

[0012] Preferably, the second base (38) and the third base (39) are further provided with guide pillars (44), and the slide plate (42) is provided with guide sleeves (45) that cooperate with the guide pillars (44) for guiding.

[0013] Preferably, the upper end edge of the lower furnace body (2) is stepped, comprising a first step surface (46) and a second step surface (47); a first annular groove (48) and a second annular groove (49) are respectively provided on the first step surface (46) and the second step surface (47); a sealing ring (50) is provided in each of the first annular groove (48) and the second annular groove (49); and the lower end edge of the upper furnace body (3) cooperates with the upper end edge of the lower furnace body (2).

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The furnace conveying component is the main component, and the furnace shifting component is the auxiliary component. The two components work together to send the PCB circuit board into the lower furnace body of the vacuum furnace, which prevents the furnace conveying component from feeding errors in a high temperature environment, and is conducive to the smooth progress of subsequent production operations.

[0016] 2. The upper furnace body lifting assembly operates through a screw drive, and the stroke control of the upper furnace body of the vacuum furnace is more precise.

[0017] 3. When the upper furnace body of the vacuum furnace is opened, the grid set on its upper part is used to reduce the heat dissipation rate. The upper furnace body heating component can perform temperature compensation in time, and the circulating fan promotes the temperature balance of various places on the upper part of the upper furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the furnace feeding and shifting assembly of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the upper furnace body lifting assembly, the lower furnace body, the upper furnace body and the upper furnace body heating assembly of the present invention;

[0021] Figure 4 It is a schematic diagram of the upper furnace body lifting assembly mechanism of the present invention;

[0022] Figure 5 It is an exploded view of the upper furnace body and the upper furnace body heating assembly of the present invention;

[0023] Figure 6 It is a schematic structural diagram of the lower furnace body related components of the present invention;

[0024] Figure 7 It is a schematic diagram of the structure of the adjustable guide rail assembly in the lower furnace body of the present invention;

[0025] Figure 8 It is a schematic diagram of the sealing structure of the upper furnace body and the lower furnace body of the present invention;

[0026] The reference numerals in the figure are: (1) frame, (2) lower furnace body, (3) upper furnace body, (4) furnace entry conveying assembly, (5) furnace entry material shifting assembly, (6) upper furnace body lifting assembly, (7) upper furnace body heating assembly, (8) linear module, (9) first base, (10) first motor, (11) material shifting rod, (12) cross plate, (13) gantry, (14) push rod, (15) connecting plate, (16) first screw nut, (17) first screw, (18) second motor, (19) grid, (20) connecting block, (21) housing, (22) air guide plate, (23) wind shield, (24) circulating air duct, (25) first heating assembly, (26) circulating fan, (27) air hole, (28) first synchronous wheel, (29) second synchronous wheel, (3 0) third synchronous wheel, (31) first synchronous belt, (32) fourth synchronous wheel, (33) second synchronous belt, (34) second heating assembly, (35) third heating assembly, (36) fourth heating assembly, (37) fifth heating assembly, (38) second base, (39) third base, (40) second screw rod, (41) second screw rod nut, (42) slide plate, (43) workpiece conveying guide rail, (44) guide column, (45) guide sleeve, (46) first step surface, (47) second step surface, (48) first annular groove, (49) second annular groove, (50) sealing ring, (51) vertical plate, (52) fifth synchronous wheel, (53) sixth synchronous wheel, (54) third synchronous belt, (55) groove, (56) partition plate, (57) adjusting wheel. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings. Example

[0028] A vacuum furnace device for a reflow soldering machine includes a frame 1, a lower furnace body 2, an upper furnace body 3 and a furnace conveying assembly 4, wherein the lower furnace body 2 and the furnace conveying assembly 4 that cooperate with each other are respectively disposed at both ends of the frame 1; and also includes a furnace shifting assembly 5, an upper furnace body lifting assembly 6 and an upper furnace body heating assembly 7.

[0029] The in-furnace material shifting assembly 5 cooperates with the in-furnace conveying assembly 4, and includes a linear module 8, a first base 9, a first motor 10, a vertical plate 51, a fifth synchronous wheel 52, a sixth synchronous wheel 53, a third synchronous belt 54 and a material shifting rod 11; the linear module 8 is fixed to the frame 1, and the linear module 8 drives the first base 9 to reciprocate along the feeding direction of the in-furnace conveying assembly 4; the first motor 10 is provided on the first base 9, and the vertical plate 51 is connected to one side end edge of the first base 9, and the fifth synchronous wheel 52 and the sixth synchronous wheel 53 are rotatably connected to the vertical plate 51, the fifth synchronous wheel 52 is connected to the output shaft of the first motor 10, the fifth synchronous wheel 52 and the sixth synchronous wheel 53 are driven by the third synchronous belt 54, and the sixth synchronous wheel 53 is connected to the material shifting rod 11. When working, the linear module 8 can be any linear module in the prior art, and the first motor 10 is connected to an external power supply, and its working principle is as follows: first, the first motor 10 drives the material removal rod 11 to rotate forward until the material removal rod 11 cooperates with the workpiece on the furnace conveying assembly 4; then, the linear module 5 drives the first motor 10, the material removal rod 11 and the corresponding workpiece to move into the lower furnace body 2 of the vacuum furnace; finally, the first motor 10 reverses to drive the material removal rod 11 to separate from the workpiece, and then the linear module 8 drives the first motor 10 and the material removal rod 11 to reset.

[0030] Furthermore, in actual use, the length of the first base 9 can be increased according to use requirements, and a plurality of the first motors 10 can be arranged on the first base 9 at intervals, and each of the first motors 10 drives one of the material moving rods 11 .

[0031] The upper furnace body lifting assembly 6 includes a transverse plate 12, a gantry 13, a push rod 14, a connecting plate 15, a first screw nut 16, a first screw 17 and a second motor 18; the transverse plate 12 is arranged on the frame 1, and is located below the lower furnace body 2; two gantries 13 are symmetrically arranged on the transverse plate 12, and the two gantries 13 are respectively located on both sides of the lower furnace body 2; the push rod 14 is movably penetrated on the top plate of each gantry 13; the middle part of the push rod 14 is fixedly connected with the connecting plate 15, and the connecting plate 15 is also provided with the first screw nut 16; each of the first screw nut 16 is threadedly matched with a first screw 17, and each of the first screw 17 is driven by the second motor 18 arranged on the transverse plate 12.

[0032] The outer wall of the top plate of the upper furnace body 3 is provided with a plurality of grids 19. Specifically, the outer wall of the top plate of the upper furnace body 3 is provided with a groove 55. The groove 55 is divided into a plurality of grids 19 by a plurality of crisscross partitions 56. The plurality of grids 19 store a certain amount of high-temperature air to reduce the heat dissipation rate of the upper furnace body 3. The side walls of both sides of the upper furnace body 3 are connected with connecting blocks 20; the connecting blocks 20 are connected to the top rods 14 of the upper furnace body lifting assembly 6.

[0033] During operation, the second motor 18 is connected to an external power supply, and the second motor 18 drives the first screw rod 17 to rotate forward and reverse synchronously, thereby driving the first screw rod nut 16, the connecting plate 15 and the push rod 14 to move up and down synchronously, and the push rod 14 is connected to the upper furnace body 3 of the vacuum furnace, and the lower furnace body 2 of the vacuum furnace is fixed on the frame 1, so that the upper furnace body 3 and the lower furnace body 2 of the vacuum furnace are finally driven by the second motor 18 to move relative to each other, that is, the upper furnace body lifting assembly 6 controls the opening and closing of the vacuum furnace.

[0034] The upper furnace body heating component 7 is located above the upper furnace body 3, and includes a shell 21, an air guide plate 22, a wind shield 23, a circulating air duct 24, a first heating component 25 and a circulating fan 26; the shell 21 is arranged on the frame 1, and the air guide plate 22 is arranged at the bottom of the shell 21; the air guide plate 22 is provided with a plurality of air holes 27 connected to the grid 19; the air guide plate 22 and the wind shield 23 arranged on its upper wall form a cavity; the cavity is equipped with the first heating component 25, and the first heating component 25 is an infrared heating component connected to an external power supply; the air inlet and the air outlet of the circulating air duct 24 are respectively connected to the two side ends of the cavity; the circulating air duct 24 is equipped with the circulating fan 26.

[0035] When the upper furnace body 3 and the lower furnace body 2 of the vacuum furnace are opened, the temperature of the upper furnace body 3 will drop suddenly, and at this time the upper furnace body 3 moves upward until it is attached to the upper furnace body heating component 7. The grid 19 on the outer wall of the top plate of the upper furnace body 3, the cavity surrounded by the air guide plate 22 and the wind shield 23, and the circulating air duct 24 form an air storage cavity, and the gas in the storage cavity is driven by the circulating fan 26 to circulate, and then the gas in the storage cavity is heated to a high temperature state by the first heating component 25, and the upper furnace body 3 is continuously heated by the circulating high-temperature gas, while ensuring that the temperatures of various parts of the upper furnace body 3 are the same; it prevents the upper furnace body temperature from dropping suddenly at the moment of opening the vacuum furnace, affecting the processing of the workpiece.

[0036] Furthermore, a first synchronous wheel 28 is mounted on the output shaft of the second motor 18, a rotating shaft (not shown in the figure) is rotatably connected to the cross plate 12, and a second synchronous wheel 29 and a third synchronous wheel 30 are respectively connected to the two ends of the rotating shaft, and the second synchronous wheel 29 and the first synchronous wheel 28 are driven by a first synchronous belt 31; a fourth synchronous wheel 32 is provided at the bottom end of each of the first screw rods 17, and all of the fourth synchronous wheels 32 and the third synchronous wheels 30 are driven by a second synchronous belt 33.

[0037] Furthermore, a second heating assembly 34 is disposed on the outer side wall of the lower furnace body 2, and a third heating assembly 35 is disposed on the bottom outer wall of the lower furnace body 2. Both the second heating assembly 34 and the third heating assembly 35 are infrared heating assemblies in the prior art and are connected to an external power supply.

[0038] Furthermore, the upper and lower sides of the furnace conveying assembly 4 are respectively equipped with a fourth heating assembly 36 and a fifth heating assembly 37. The fourth heating assembly 36 and the second heating assembly 37 are both infrared heating assemblies in the prior art and are both arranged on the frame 1.

[0039] Furthermore, the lower furnace body 2 is also provided with an adjustable guide rail assembly, which includes a second base 38, a third base 39, a second screw rod 40, a second screw rod nut 41, a slide plate 42, a workpiece conveying guide rail 43 and an adjusting wheel 57; the second base 38 and the third base 39 are relatively installed in the lower furnace body 2; the two ends of the second screw rod 40 are rotatably connected to the second base 38 and the third base 39 respectively, the second screw rod 40 is threadedly matched with the second screw rod nut 41, and the second screw rod nut 41 is fixedly connected to the slide plate 42; the second base 38 and the slide plate 42 are respectively provided with a workpiece conveying guide rail 43. The second screw rod 40 is connected with the adjusting wheel 57. When in use, when the adjusting wheel 57 is rotated, the second screw rod 40 and the adjusting wheel 57 rotate synchronously, thereby driving the second screw rod nut 41 and the slide plate 42 to slide synchronously, and finally changing the spacing between the two workpiece conveying guide rails 43, which has the advantages of simple adjustment and good universal performance.

[0040] Furthermore, guide posts 44 are provided on the second base 38 and the third base 39 , and the slide plate 42 is provided with guide sleeves 45 which cooperate with the guide posts 44 , thereby improving the accuracy and stability of the slide plate 42 when sliding.

[0041] Furthermore, the upper edge of the lower furnace body 2 is stepped, including a first step surface 46 and a second step surface 47; the first step surface 46 and the second step surface 47 are respectively provided with a first annular groove 48 and a second annular groove 49; a sealing ring 50 is provided in each of the first annular groove 48 and the second annular groove 49; the lower edge of the upper furnace body 3 is matched with the upper edge of the lower furnace body 2). The sealing is performed by the two sealing rings 50 that are staggered in height, so that the sealing effect of the upper furnace body 3 and the lower furnace body 2 of the vacuum furnace of the present invention is better when they are closed.

[0042] It should be noted here that the furnace conveying component 4 can be the board introduction device of the reflow soldering machine disclosed in the patent application No. 200820046891.4 recently applied by the applicant, or it can be a conveying function component in the prior art such as a conveyor belt.

[0043] The workflow of the furnace conveying assembly of the present invention is as follows:

[0044] First, the upper furnace body lifting assembly 2 drives the furnace body of the vacuum furnace to open, and at this time the upper furnace body heating assembly 7 performs heating temperature compensation on the upper furnace body 3; then, the furnace conveying assembly 4 drives the PCB circuit board to move into the lower furnace body 2; then, the furnace material shifting assembly 5 shifts the PCB circuit board on the furnace conveying assembly 4, and the furnace conveying assembly 4 and the furnace material shifting assembly 5 jointly push the PCB circuit board into the lower furnace body 2, and in the process of the PCB circuit board entering the lower furnace body 2, the fourth heating assembly 36 and the fifth heating assembly 37 pre-heat the PCB circuit board; finally, each part is reset, and the furnace body of the vacuum furnace is closed.

[0045] In summary, the present invention solves the deficiencies in the prior art and has the characteristics of reasonable structural design, better sealing effect, etc.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A vacuum furnace device for a reflow soldering machine, comprising a frame (1), a lower furnace body (2), an upper furnace body (3) and a furnace conveying assembly (4), wherein the lower furnace body (2) and the furnace conveying assembly (4) are respectively provided at two ends of the frame (1) and cooperate with each other; the characteristics are as follows: It also includes a furnace material feeding assembly (5), an upper furnace body lifting assembly (6) and an upper furnace body heating assembly (7); The in-furnace material shifting assembly (5) cooperates with the in-furnace conveying assembly (4), and comprises a linear module (8), a first base (9), a first motor (10) and a material shifting rod (11); the linear module (8) is fixed to the frame (1), and the linear module (8) drives the first base (9) to reciprocate along the feeding direction of the in-furnace conveying assembly (4); the first base (9) is provided with the first motor (10), and the first motor (10) drives the material shifting rod (11) to rotate; The upper furnace body lifting assembly (6) comprises a transverse plate (12), a gantry (13), a push rod (14), a connecting plate (15), a first screw nut (16), a first screw (17) and a second motor (18); the transverse plate (12) is arranged on the frame (1) and is located below the lower furnace body (2); two gantry frames (13) are symmetrically arranged on the transverse plate (12), and the two gantry frames (13) are respectively located on both sides of the lower furnace body (2); the push rod (14) is movably penetrated on the top plate of each gantry (13); the middle part of the push rod (14) is fixedly connected to the connecting plate (15), and the connecting plate (15) is also provided with the first screw nut (16); each first screw nut (16) is threadedly matched with a first screw (17), and each first screw (17) is driven by the second motor (18) arranged on the transverse plate (12); The outer wall of the top plate of the upper furnace body (3) is provided with a plurality of grids (19); both side walls of the upper furnace body (3) are connected with connecting blocks (20); the connecting blocks (20) are connected to the top rods (14) of the upper furnace body lifting assembly (6); The upper furnace body heating component (7) is located above the upper furnace body (3), and comprises a shell (21), an air guide plate (22), a wind shield (23), a circulating air duct (24), a first heating component (25) and a circulating fan (26); the shell (21) is arranged on the frame (1), and the bottom of the shell (21) is provided with the air guide plate (22); the air guide plate (22) is provided with a plurality of air holes (27) which are in communication with the grid (19); the air guide plate (22) and its upper wall are connected to each other. The wind shield (23) is arranged to enclose a cavity; the cavity is equipped with the first heating component (25); the air inlet and the air outlet of the circulating air duct (24) are respectively connected to the two side ends of the cavity; the circulating air duct (24) is equipped with the circulating fan (26); an adjustable guide rail assembly is also arranged in the lower furnace body (2), and the adjustable guide rail assembly includes a second base (38), a third base (39), a second screw rod (40), a second screw rod nut (41), and a slide plate (42 ) and a workpiece conveying guide rail (43); the second base (38) and the third base (39) are relatively mounted in the lower furnace body (2); the two ends of the second screw rod (40) are rotatably connected to the second base (38) and the third base (39), the second screw rod (40) is threadedly matched with the second screw rod nut (41), and the second screw rod nut (41) is fixedly connected to the slide plate (42); the second base (38) and the slide plate (42) are respectively provided with a workpiece conveying guide rail (43); the upper edge of the lower furnace body (2) is stepped, including a first step surface (46) and a second step surface (47); the first step surface (46) and the second step surface (47) are respectively provided with a first annular groove (48) and a second annular groove (49); the first annular groove (48) and the second annular groove (49) are both provided with a sealing ring (50); the lower edge of the upper furnace body (3) is matched with the upper edge of the lower furnace body (2).

2. The vacuum furnace equipment for reflow soldering machine according to claim 1, characterized in that: The output shaft of the second motor (18) is provided with a first synchronous wheel (28); the transverse plate (12) is rotatably connected with a rotating shaft; the two ends of the rotating shaft are respectively connected with a second synchronous wheel (29) and a third synchronous wheel (30); the second synchronous wheel (29) and the first synchronous wheel (28) are driven by a first synchronous belt (31); a fourth synchronous wheel (32) is provided at the bottom end of each of the first screw rods (17); all the fourth synchronous wheels (32) and the third synchronous wheels (30) are driven by a second synchronous belt (33).

3. The vacuum furnace equipment for reflow soldering machine according to claim 1, characterized in that: A second heating assembly (34) is provided on the side wall of the lower furnace body (2); and a third heating assembly (35) is provided at the bottom of the lower furnace body (2).

4. The vacuum furnace equipment for reflow soldering machine according to claim 1, characterized in that: The upper and lower sides of the furnace conveying assembly (4) are respectively equipped with a fourth heating assembly (36) and a fifth heating assembly (37).

5. The vacuum furnace equipment for reflow soldering machine according to claim 1, characterized in that: The second base (38) and the third base (39) are also provided with guide pillars (44), and the slide plate (42) is provided with guide sleeves (45) that cooperate with the guide pillars (44) for guiding.

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