Nitrogen reflow soldering furnace for SMT (Surface Mount Technology)

Abstract

The utility model discloses a nitrogen reflow soldering furnace for SMT, a transfer mechanism comprises a mounting box, one end of the inner wall of the mounting box is fixedly connected with a motor, an output shaft of the motor is fixedly connected with a rotating plate, one side, far away from the motor, of the rotating plate is fixedly connected with a supporting block, and the supporting block is fixedly connected with the rotating plate. A push shaft is fixedly connected to the end, close to the supporting block, of the outer wall of the rotating plate, a rotating rod is rotationally connected to the position, located above the rotating plate, of the inner wall of the mounting box, a rotating wheel is fixedly connected to the position, close to the rotating plate, of the outer wall of the rotating rod, and the outer side wall of the rotating wheel movably makes contact with the supporting block; pushing grooves are formed in the periphery of the side wall of the rotating wheel, the inner wall of each pushing groove is slidably connected with a pushing shaft, the SMT patches are pushed by the conveying belt to move to the position above the transfer plate, the clamping rods rotate and drive the transfer plate to lift the SMT patches to the position of a second fan, the conveying belt can transfer other SMT patches to be welded to the position below the welding head for machining, and the SMT patches can be welded to the position below the welding head for machining. And the continuity of welding work is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of SMT patch processing, in particular to a nitrogen reflow oven used for SMT. Background Art

[0002] SMT nitrogen reflow oven is a kind of welding equipment widely used in the electronics manufacturing industry. It is mainly used for the welding process in surface mount technology. The main feature of this welding furnace is that nitrogen is used to replace air during the welding process, thereby creating a low-oxidation welding environment. In a nitrogen environment, the oxygen content is greatly reduced, which effectively prevents the reaction between solder and oxygen during the welding process and reduces the generation of oxides, which helps to improve the quality of solder joints, enhance solderability, reduce welding defects, and improve the long-term reliability of electronic components.

[0003] A Chinese patent discloses a reflow oven for SMT patch processing with a cooling mechanism (publication number: CN215545615U). The device is provided with a fan inside the reflow oven, and a semiconductor cooling sheet is provided at the bottom of the purification box. The fan and the semiconductor cooling sheet form a cooling mechanism, which can cool the SMT patch after welding to prevent the temperature of the SMT patch from being too high and prevent the hand from being burned when taking it. However, the device still has the following problems when used:

[0004] After soldering the SMT patch, the above device is cooled inside the reflow oven. While waiting for the soldered SMT patch to cool down, the internal space of the reflow oven is occupied and other SMT patches cannot be soldered, which is not conducive to improving the soldering efficiency of the device. Therefore, a nitrogen reflow oven for SMT is proposed to solve the above problem. Utility Model Content

[0005] The technical problem to be solved by the utility model is as follows: while waiting for the soldered SMT patch to cool down, the internal space of the reflow oven is occupied and other SMT patches cannot be soldered, which is not conducive to improving the efficiency of device soldering.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A nitrogen reflow oven for SMT, comprising a device body, a transfer mechanism is arranged on one side of the device body, the device body comprises a first fan and a second fan, and the transfer mechanism comprises a motor;

[0008] Also includes:

[0009] Wherein, the transfer mechanism comprises an installation box, one end of the inner wall of the installation box is fixedly connected to the motor, the output shaft of the motor is fixedly connected to a rotating plate, the rotating plate is fixedly connected to a support block on a side away from the motor, and the outer wall of the rotating plate and one end close to the support block is fixedly connected to a push shaft;

[0010] Among them, the inner wall of the installation box is rotatably connected to a rotating rod located above the rotating plate, the outer wall of the rotating rod is fixedly connected to a rotating wheel near the rotating plate, the outer side wall of the rotating wheel is in movably contact with the support block, and push grooves are opened around the side walls of the rotating wheel, and the inner walls of each push groove are slidably connected to the push shaft.

[0011] As a further solution of the utility model: the rotating rod is located at the end away from the rotating wheel and passes through the installation box, and the middle outer wall of the rotating rod is fixedly connected with clamping rods all around, and the inner side of the clamping rod and the side away from the rotating rod is rotatably connected with a transfer plate, and one end of the transfer plate is externally fixedly connected with a limiting axis.

[0012] As a further solution of the utility model: the device body includes an outer shell, both ends of the side of the outer shell are rotatably connected with conveying rollers, the outer side of the conveying roller is bound and connected with a conveyor belt, the inner wall of the outer shell and one side of the conveyor belt is provided with a limiting rail, the limiting rail is annular as a whole, the inner wall of the outer shell and the inner side of the limiting rail are rotatably connected to the rotating rod, and the inner wall of the limiting rail is slidably connected to four limiting shafts, and the outer wall of the installation box and the side away from the conveyor belt is slidably connected with a movable door.

[0013] As a further solution of the utility model: a welding head is fixedly installed on the inner wall of the outer shell and located above the conveyor belt, and an exhaust pipe is fixedly connected to the inner wall of the outer shell and located on both sides of the welding head. The exhaust pipe is located on the side away from the welding head and extends upward.

[0014] As a further solution of the utility model: a treatment box is fixedly installed on the upper end of the inner wall of the outer shell, a plurality of layers of air filter mesh are fixedly connected to the middle part of the treatment box, the bottom of the treatment box is fixedly connected to fan 1, and the bottom of fan 1 is fixedly connected to the exhaust pipe, the top of the treatment box is connected through an exhaust pipe, and the top end of the exhaust pipe extends to the top of the outer shell.

[0015] As a further solution of the utility model: the inner wall of the outer shell is located above the top of the limit rail and is fixedly installed with the second fan, and a connecting pipe is fixedly connected to one side of the outer wall of the second fan. The connecting pipe is located at the end away from the second fan and is connected to the bottom of the side of the processing box.

[0016] As a further solution of the utility model: a dustproof net is fixedly connected to the inner wall of the bottom end of the exhaust pipe.

[0017] Beneficial effects of the utility model:

[0018] (1) The utility model transfers the SMT patches after welding through the transfer mechanism, that is, the SMT patches are pushed by the conveyor belt to move above the transfer plate, the clamping rod rotates and drives the transfer plate to lift the SMT patches to the second fan, and the SMT patches can be quickly cooled when the second fan is started. At this time, the conveyor belt can transfer other SMT patches to be welded to the bottom of the welding head for processing, which improves the continuity of welding work and helps to improve work efficiency;

[0019] (2) When the transfer plate is driven by the clamping rod to operate, the other end of the transfer plate moves in the annular limit rail through the limit shaft, so that the transfer plate always remains horizontal to the ground when carrying the SMT patch, thereby improving the stability of the transfer plate in conveying the SMT patch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the internal structure of the outer shell of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the outer shell of the utility model from a side view;

[0023] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of region A;

[0024] Figure 4 It is a side view schematic diagram of the internal structure of the installation box in the utility model;

[0025] Figure 5 It is a schematic diagram of the top view of the transfer plate in the utility model.

[0026] In the figure: 1. Device body; 101. Outer shell; 102. Conveyor roller; 103. Conveyor belt; 104. Welding head; 105. Exhaust pipe; 106. Fan 1; 107. Processing box; 108. Air filter; 109. Exhaust pipe; 110. Fan 2; 111. Connecting pipe; 112. Movable door; 113. Limit rail; 2. Transfer mechanism; 201. Installation box; 202. Motor; 203. Rotating plate; 204. Support block; 205. Push shaft; 206. Rotating wheel; 207. Push groove; 208. Rotating rod; 209. Clamping rod; 210. Transfer plate; 211. Limit shaft. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1-5 As shown, a nitrogen reflow oven for SMT includes a device body 1, a transfer mechanism 2 is arranged on one side of the device body 1, the device body 1 includes a fan 106 and a fan 2 110, and the transfer mechanism 2 includes a motor 202; wherein the transfer mechanism 2 includes an installation box 201, one end of the inner wall of the installation box 201 is fixedly connected to the motor 202, the output shaft of the motor 202 is fixedly connected to a rotating plate 203, and the rotating plate 203 is located on a side away from the motor 202 and is fixedly connected to a support block 204, the outer wall of the rotating plate 203 and one end close to the support block 204 is fixedly connected with a push shaft 205; wherein, the inner wall of the installation box 201 and located above the rotating plate 203 is rotatably connected with a rotating rod 208, the outer wall of the rotating rod 208 and close to the rotating plate 203 is fixedly connected with a rotating wheel 206, the outer wall of the rotating wheel 206 is in active contact with the support block 204, and the side wall of the rotating wheel 206 is surrounded by push grooves 207, and the inner wall of each push groove 207 is slidably connected with the push shaft 205, such as Figure 4 As shown, when the support block 204 abuts against the side of the rotating wheel 206, the rotation of the rotating wheel 206 is limited;

[0029] The rotating rod 208 is located at one end away from the rotating wheel 206 and passes through the installation box 201, and the central outer wall of the rotating rod 208 is fixedly connected with a clamping rod 209 all around, and the inner side of the clamping rod 209 and the side away from the rotating rod 208 is rotatably connected with a transfer plate 210, and one end of the transfer plate 210 is externally fixedly connected to a limited position shaft 211, such as Figure 1 As shown, when the rotating rod 208 rotates, the entire transfer plate 210 is displaced through the clamping rod 209;

[0030] The device body 1 includes an outer shell 101, both ends of the side of the outer shell 101 are rotatably connected with a conveying roller 102, the outer side of the conveying roller 102 is bound and connected with a conveyor belt 103, the inner wall of the outer shell 101 and one side of the conveyor belt 103 is provided with a limit rail 113, the limit rail 113 is annular as a whole, the inner wall of the outer shell 101 and the inner side of the limit rail 113 are rotatably connected with a rotating rod 208, and the inner wall of the limit rail 113 is slidably connected with four limit shafts 211, and the outer wall of the installation box 201 and the side away from the conveyor belt 103 is slidably connected with a movable door 112, such as Figure 1As shown, by lifting the movable door 112, the SMT patches on the rightmost transfer plate 210 can be collected;

[0031] A welding head 104 is fixedly installed on the inner wall of the outer shell 101 and located above the conveyor belt 103. An exhaust pipe 105 is fixedly connected to the inner wall of the outer shell 101 and located on both sides of the welding head 104. The exhaust pipe 105 is located on the side away from the welding head 104 and extends upward. A treatment box 107 is fixedly installed on the upper end of the inner wall of the outer shell 101. A plurality of layers of air filter nets 108 are fixedly connected to the middle of the treatment box 107. The bottom of the treatment box 107 is fixedly connected to the fan 106, and the bottom of the fan 106 is fixedly connected to the exhaust pipe 105. The top of the treatment box 107 is connected with an exhaust pipe 109. The top of the exhaust pipe 109 extends to the top of the outer shell 101. Figure 1 As shown, when the fan 106 is started, the fan 106 can extract the exhaust gas and transport it to the treatment box 107 for filtration;

[0032] The inner wall of the outer shell 101 is located above the top of the limit rail 113 and is fixedly installed with the second fan 110. A connecting pipe 111 is fixedly connected to one side of the outer wall of the second fan 110. The connecting pipe 111 is located at one end away from the second fan 110 and is connected to the bottom of the side of the processing box 107. Figure 1 As shown, when the fan 210 is started, the SMT patch above the top transfer plate 210 is cooled by air;

[0033] The inner wall of the bottom end of the exhaust pipe 105 is fixedly connected with a dustproof net, such as Figure 1 As shown, the dust screen prevents larger debris from entering the exhaust pipe 105 and causing blockage.

[0034] The working principle of this utility model:

[0035] When the device is in use, the SMT patch to be welded is placed above the conveyor belt 103. When the conveyor roller 102 is started, the conveyor belt 103 is driven to rotate, so that the SMT patch is transferred to the bottom of the welding head 104 for step-by-step welding. The welded SMT patch is moved to the top of the transfer plate 210 by the conveyor belt 103. At this time, the motor 202 is started, and the output shaft of the motor 202 drives the rotating plate 203 to rotate continuously, so that the push shaft 205 moves into the push groove 207 and drives the rotating wheel 206 to rotate. When the push shaft 205 rotates to the push groove 207 and separates, the rotating wheel 206 is rotated. The plate 203 stops rotating, and the support block 204 presses against the side of the rotating plate 203 to prevent the rotating plate 203 from rotating due to external force. During a single rotation of the rotating plate 203, the rotating rod 208 drives the clamping rod 209 to rotate by 90 degrees, so that the transfer plate 210 transfers the SMT patch to the fan 110. When the fan 110 is started, the heat on the surface of the SMT patch is taken away by the airflow. The airflow enters the processing box 107 along the connecting pipe 111 and contacts the air filter 108. The filtered gas passes through the air filter 108 and is discharged through the exhaust pipe 109.

[0036] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A nitrogen reflow oven for SMT, comprising a device body (1), a transfer mechanism (2) being arranged on one side of the device body (1), the device body (1) comprising a first fan (106) and a second fan (110), and the transfer mechanism (2) comprising a motor (202); It is characterized in that Also includes: The transfer mechanism (2) comprises an installation box (201), one end of the inner wall of the installation box (201) is fixedly connected to the motor (202), the output shaft of the motor (202) is fixedly connected to a rotating plate (203), the rotating plate (203) is fixedly connected to a support block (204) on a side away from the motor (202), and the outer wall of the rotating plate (203) and one end close to the support block (204) is fixedly connected to a push shaft (205); A rotating rod (208) is rotatably connected to the inner wall of the installation box (201) and located above the rotating plate (203); a rotating wheel (206) is fixedly connected to the outer wall of the rotating rod (208) and close to the rotating plate (203); the outer wall of the rotating wheel (206) is in active contact with the support block (204); push grooves (207) are provided around the side walls of the rotating wheel (206); and the inner walls of each push groove (207) are slidably connected to the push shaft (205).

2. A nitrogen reflow oven for SMT according to claim 1, characterized in that: The rotating rod (208) is located at an end away from the rotating wheel (206) and passes through the installation box (201), and the central outer wall of the rotating rod (208) is fixedly connected with clamping rods (209) all around, and the inner side of the clamping rod (209) and the side away from the rotating rod (208) is rotatably connected with a transfer plate (210), and one end of the transfer plate (210) is externally fixedly connected with a limiting axis (211).

3. A nitrogen reflow oven for SMT according to claim 1, characterized in that: The device body (1) comprises an outer shell (101), both ends of the side of the outer shell (101) are rotatably connected to conveying rollers (102), the outer side of the conveying roller (102) is bound and connected to a conveyor belt (103), the inner wall of the outer shell (101) and located on one side of the conveyor belt (103) is provided with a limit rail (113), the limit rail (113) is annular as a whole, the inner wall of the outer shell (101) and located on the inner side of the limit rail (113) are rotatably connected to a rotating rod (208), and the inner wall of the limit rail (113) is slidably connected to four limit shafts (211), and the outer wall of the installation box (201) and the side away from the conveyor belt (103) is slidably connected to a movable door (112).

4. A nitrogen reflow oven for SMT according to claim 3, characterized in that: A welding head (104) is fixedly mounted on the inner wall of the outer shell (101) and located above the conveyor belt (103); exhaust pipes (105) are fixedly connected to the inner wall of the outer shell (101) and located on both sides of the welding head (104); the exhaust pipes (105) are located on a side away from the welding head (104) and extend upward.

5. A nitrogen reflow oven for SMT according to claim 3, characterized in that: A treatment box (107) is fixedly mounted on the upper end of the inner wall of the outer shell (101); a plurality of layers of air filter nets (108) are fixedly connected to the middle of the treatment box (107); the bottom of the treatment box (107) is fixedly connected to the fan 1 (106); and the bottom of the fan 1 (106) is fixedly connected to the exhaust pipe (105); the top of the treatment box (107) is connected through an exhaust pipe (109); the top end of the exhaust pipe (109) extends to the top of the outer shell (101).

6. A nitrogen reflow oven for SMT according to claim 3, characterized in that: The inner wall of the outer shell (101) is fixedly mounted on the top of the limit rail (113) and is connected to the second fan (110). A connecting pipe (111) is fixedly connected to one side of the outer wall of the second fan (110). The connecting pipe (111) is located at an end away from the second fan (110) and is connected to the bottom of the side of the processing box (107).

7. A nitrogen reflow oven for SMT according to claim 4, characterized in that: A dustproof net is fixedly connected to the inner wall of the bottom end of the exhaust pipe (105).

Images