Conveying device for vacuum reflow soldering furnace

Abstract

The utility model relates to the technical field of reflow soldering furnaces, and discloses a conveying device for a vacuum reflow soldering furnace, which comprises a conveying roller and a gas guide pipe, two ends of the conveying roller are respectively provided with a fixed side plate which is integrally formed with the conveying roller, and the axis positions of the conveying roller and the fixed side plates are respectively provided with a gas bin. Communicating grooves communicating with the air bin are formed in the two fixing side plates, a plurality of second exhaust ports are formed in the ends, close to each other, of the two fixing side plates correspondingly, the air guide pipe is located in the conveying roller, and a plurality of air holes are formed in the side wall of the air guide pipe; nitrogen can be conveyed to the bottom of the circuit board through the gas guide pipe and the first exhaust port in the conveying roller, nitrogen can be conveyed to the upper side and the lower side of the circuit board through the fixed side plate and the second exhaust port in the fixed side plate, and therefore it is guaranteed that the outer surface of the circuit board can make contact with the nitrogen completely.

Description

TECHNICAL FIELD

[0001] The utility model relates to reflow soldering furnace technical field, concretely to a kind of conveying device for vacuum reflow soldering furnace. BACKGROUND

[0002] Reflow soldering furnace is used for the equipment of the soldering of circuit board loaded with electronic components. Reflow soldering furnace is divided into nitrogen furnace and air furnace according to whether there is inert atmosphere protection. Nitrogen protection in reflow soldering furnace prevents the oxidation of soldering tin and silver in the reflow area under high temperature, to avoid welding defects. In the prior art, circuit board is automatically transported from the upper process of process flow line to import channel, and after being heated by the hot air of furnace chamber, the whole temperature curve is completed, and then the circuit board is automatically output to the next process through export channel, to realize the full automation of the whole flow line. In the process of circuit board flow line, due to unstable oxygen content display, the welding surface is easily oxidized, which affects the welding effect.

[0003] The existing mode installs purging nitrogen module outside the base, and nitrogen is injected into the channel. However, the consumption of nitrogen is greatly increased, resulting in increased cost. Another method is to set a flexible grass skirt on the import and export channels of the reflow soldering furnace, but since the flexible grass skirt cannot contact the parts of the circuit board, the limitation of the height of the grass skirt makes it impossible to effectively prevent the entry of external air

[0004] According to the Chinese patent document with the publication number CN208713072U, a kind of air current conveying device for reflow soldering furnace, including: ventilation pipe and conveying pipe, the ventilation pipe is set in the conveying pipe, ventilation pipe's both ends stretch out the conveying pipe, the both ends of the conveying pipe and ventilation pipe are respectively equipped with rolling bearing;A plurality of air holes are provided on the ventilation pipe along the length direction, and a plurality of air holes are provided on the pipe wall of the conveying pipe. The utility model combines the conveying device of circuit board with nitrogen charging device, reduces the volume of mechanism, and the utility model can directly pass nitrogen to circuit board, saves nitrogen consumption, and reduces production cost.

[0005] However, the above-mentioned device can only transmit nitrogen to the bottom of the circuit board when in use, and the upper side of the circuit board cannot be fully contacted with nitrogen. Therefore, a conveying device for vacuum reflow soldering furnace is proposed. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a conveying device for vacuum reflow soldering furnace to solve the problems raised in the above background.

[0007] To achieve the above object, the utility model provides the following technical scheme: a conveying device for vacuum reflow soldering furnace, including conveying roller and gas guide pipe, both ends of conveying roller are provided with fixed side plate integrated with it respectively, the axial position of conveying roller and fixed side plate all is equipped with gas storehouse, the inside of two fixed side plates is equipped with the communication groove who communicates with gas storehouse, the end of two fixed side plates is equipped with a plurality of no.

[0008] As a further preferred of the technical solution, the plurality of the second exhaust port is annular array.

[0009] As a further preferred of the technical solution, the gas guide pipe is fixedly connected on the inner wall of the reflow soldering furnace at both ends, one end of the gas guide pipe is a closed structure, and the other end of the gas guide pipe is fixedly connected with an extension pipe.

[0010] As a further preferred of the technical solution, the extension pipe is located outside the reflow soldering furnace, and a flow meter for detecting airflow is arranged on the outer wall of the extension pipe.

[0011] As a further preferred of the technical solution, the end of the two fixed side plates away from each other is fixedly connected with a rotating shaft, and the axial position of the rotating shaft is a hollow structure.

[0012] As a further preferred of the technical solution, a bearing is arranged between the inner wall of the rotating shaft and the outer wall of the gas guide pipe.

[0013] As a further preferred of the technical solution, a transmission gear is sleeved on the outer wall of the rotating shaft, and the transmission gear is fixedly connected with the rotating shaft.

[0014] The utility model provides a conveying device for vacuum reflow soldering furnace has the following beneficial effects:

[0015] The utility model discloses a gas guide pipe and the first exhaust port on the conveying roller can convey nitrogen to the bottom of the circuit board, and the fixed side plate and the second exhaust port on the fixed side plate can convey nitrogen to the upper and lower sides of the circuit board, so that the outer surface of the circuit board can all contact nitrogen. ACCURACY OF DRAWINGS

[0016] Figure 1 It is the schematic diagram of the whole structure of the utility model;

[0017] Figure 2 It is the exploded schematic diagram of the whole structure of the utility model;

[0018] Figure 3 It is the exploded schematic diagram of part structure of the utility model.

[0019] Figure 4 In this utility model Figure 3 A diagram illustrating the breakdown;

[0020] In the diagram: 1. Conveyor roller; 2. Rotating shaft; 3. Air guide pipe; 4. No. 1 exhaust port; 5. Fixed side plate; 6. Air hole; 7. Connecting groove; 8. No. 2 exhaust port; 9. Transmission gear; 10. Flow meter; 11. Bearing; 12. Air chamber; 13. Extension pipe. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a technical solution: such as Figures 1 to 4 As shown in this embodiment, a conveying device for a vacuum reflow oven includes a conveying roller 1 and a gas guide pipe 3. The two ends of the conveying roller 1 are respectively provided with fixed side plates 5 integrally formed therewith. Gas chambers 12 are opened at the axial positions of both the conveying roller 1 and the fixed side plates 5. The interior of the two fixed side plates 5 is provided with a connecting groove 7 communicating with the gas chamber 12. The two fixed side plates 5 are respectively provided with multiple secondary exhaust ports 8 at their close ends. The multiple secondary exhaust ports 8 are arranged in a ring array. The gas guide pipe 3 is located inside the conveying roller 1. Multiple air holes 6 are opened on the side wall of the gas guide pipe 3.

[0023] The gas guide pipe 3 is fixedly connected to the inner wall of the reflow oven at both ends. One end of the gas guide pipe 3 is a closed structure, and the other end of the gas guide pipe 3 is fixedly connected to the extension pipe 13. The extension pipe 13 is located outside the reflow oven, and a flow meter 10 for detecting the airflow is installed on the outer wall of the extension pipe 13.

[0024] Among them, the two fixed side plates 5 are respectively fixedly connected to the opposite ends of the rotating shafts 2, and the axis of the rotating shafts 2 is a hollow structure.

[0025] The two ends of the conveyor roller 1 can be rotatably connected to the inner wall of the reflow oven via the rotating shaft 2.

[0026] A bearing 11 is provided between the inner wall of the rotating shaft 2 and the outer wall of the air guide tube 3.

[0027] The bearing 11 can prevent friction between the rotating shaft 2 and the air duct 3.

[0028] One of the rotating shafts 2 has a transmission gear 9 fitted on its outer wall, and the transmission gear 9 is fixedly connected to the rotating shaft 2.

[0029] In use, the transmission chain inside the reflow oven drives the transmission gear 9 to rotate, which in turn drives the conveyor roller 1 to transport the circuit board.

[0030] This utility model provides a conveying device for a vacuum reflow oven, the specific working principle of which is as follows:

[0031] In use, nitrogen gas is introduced into the gas guide pipe 3 through the extension pipe 13. The nitrogen gas will enter the gas chamber 12 on the conveyor roller 1 through the gas hole 6 on the gas guide pipe 3. The nitrogen gas in the gas chamber 12 will be discharged through the first exhaust port 4 on the conveyor roller 1. When the conveyor roller 1 conveys the circuit board, the nitrogen gas discharged from the first exhaust port 4 can contact the bottom of the circuit board. At the same time, the connecting groove 7 inside the fixed side plate 5 is in communication with the gas chamber 12. The nitrogen gas in the gas chamber 12 will enter the connecting groove 7 and then be discharged through the second exhaust port 8, so that the nitrogen gas is sprayed out from the left and right sides of the circuit board and covers the top and bottom sides of the circuit board.

[0032] It should be noted that a sealing ring needs to be installed between the outer wall of the extension tube 13 and the reflow oven to avoid insufficient airtightness of the reflow oven.

[0033] Although embodiments of the present 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 these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A conveying device for a vacuum reflow oven, comprising a conveying roller (1) and a gas guide pipe (3), characterized in that: The conveyor roller (1) is provided with fixed side plates (5) integrally formed at both ends. Air chambers (12) are provided at the axial positions of both the conveyor roller (1) and the fixed side plates (5). A connecting groove (7) communicating with the air chambers (12) is provided inside the two fixed side plates (5). Multiple second exhaust ports (8) are provided at the ends of the two fixed side plates (5) that are close to each other. The air guide pipe (3) is located inside the conveyor roller (1). Multiple air holes (6) are provided on the side wall of the air guide pipe (3).

2. The conveying device for a vacuum reflow oven according to claim 1, characterized in that: Multiple exhaust ports (8) are arranged in a ring array.

3. The conveying device for a vacuum reflow oven according to claim 1, characterized in that: The two ends of the gas guide pipe (3) are fixedly connected to the inner wall of the reflow oven. One end of the gas guide pipe (3) is a closed structure, and the other end of the gas guide pipe (3) is fixedly connected to an extension pipe (13).

4. A conveying device for a vacuum reflow oven according to claim 3, characterized in that: The extension tube (13) is located outside the reflow oven, and a flow meter (10) for detecting airflow is provided on the outer wall of the extension tube (13).

5. A conveying device for a vacuum reflow oven according to claim 1, characterized in that: The two fixed side plates (5) are respectively fixedly connected to a rotating shaft (2) at their far ends, and the axis of the rotating shaft (2) is a hollow structure.

6. A conveying device for a vacuum reflow oven according to claim 5, characterized in that: A bearing (11) is provided between the inner wall of the rotating shaft (2) and the outer wall of the air guide pipe (3).

7. A conveying device for a vacuum reflow oven according to claim 5, characterized in that: A transmission gear (9) is fitted on the outer wall of one of the rotating shafts (2), and the transmission gear (9) is fixedly connected to the rotating shaft (2).

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