A paster preheating device and method

Abstract

This invention discloses a preheating device and method for a pick-and-place machine, belonging to the field of pick-and-place machine preheating. The preheating device includes a wind box, and further includes: a preheating unit disposed on the wind box, used to draw in outside air into the wind box for heating and then discharge it in the opposite direction; a dustproof unit disposed within the preheating unit, used to block dust in the air when it is drawn into the wind box; an air distribution unit disposed on the side of the preheating unit away from the dustproof unit, the preheating unit driving the air distribution unit to rotate, used to guide and evenly distribute the discharged hot air towards the pick-and-place machine; and a control unit disposed on the air distribution unit, electrically connected to the preheating unit, the resistance connected to the control unit increasing as the temperature of the pick-and-place machine rises. This invention overcomes the problems of low preheating efficiency, serious waste of hot air, and uneven preheating in pick-and-place machines.

Description

Technical Field

[0001] This invention relates to the field of pick and place machine preheating technology, and in particular to a pick and place machine preheating equipment and method. Background Technology

[0002] The preheating equipment for a pick-and-place machine is mainly divided into two parts: power-on preheating and warm-up. Power-on preheating mainly affects the electrical circuits and usually only takes a few minutes to complete. Warm-up, on the other hand, mainly affects the mechanical parts to ensure that the lubrication system of the mechanical parts can work properly and reach the appropriate temperature, so that the entire equipment can reach its optimal state for subsequent operation. This usually takes several tens of minutes.

[0003] Currently, most pick-and-place machines use preheating equipment to blow hot air to preheat different parts of the machine. Due to the large internal space of the pick-and-place machine, a large amount of hot air is directly passed through the machine during preheating. This not only makes the preheating time longer but also wastes a lot of hot air, greatly increasing the energy consumption of the preheating process. In addition, uneven preheating can negatively impact the operation of the pick-and-place machine. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of low preheating efficiency, serious waste of hot air, and uneven preheating in existing pick-and-place machines, and to propose a preheating device and method for pick-and-place machines.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A preheating device for a pick-and-place machine includes a wind box, and further includes: a preheating unit disposed on the wind box for drawing in outside air into the wind box for heating and discharging it in the opposite direction; a dustproof unit disposed within the preheating unit for blocking dust in the air when air is drawn into the wind box; an air distribution unit disposed on the side of the preheating unit away from the dustproof unit, the preheating unit driving the air distribution unit to rotate, for guiding and evenly discharging the discharged hot air towards the pick-and-place machine; a control unit disposed on the air distribution unit, the control unit being electrically connected to the preheating unit, the resistance connected to the control unit increasing as the temperature of the pick-and-place machine rises; and a drive unit disposed within the air distribution unit, the drive unit being connected to the dustproof unit via a pipe, the air distribution unit being able to intermittently contact the drive unit.

[0007] To facilitate preheating of the pick-and-place machine, preferably, the preheating unit includes an air inlet channel and an exhaust channel mounted on a wind box. A heater is installed inside the wind box. A mounting bracket is fixedly connected to the inner wall of the exhaust channel. A drive motor is fixedly connected to the mounting bracket. A fan is rotatably connected to the side of the mounting bracket away from the drive motor. The output end of the drive motor is connected to the fan. The air inlet channel and the exhaust channel are located on opposite sides of the wind box, and both the air inlet channel and the exhaust channel are connected to the wind box. The fan is in contact with the inner wall of the exhaust channel.

[0008] To ensure the stability of gas flow and reduce the impact of dust on the pick-and-place machine, the dustproof unit further includes multiple sets of fixed plates fixedly connected to the inner wall of the air inlet channel. A vibration cylinder is fixedly connected to the side of the fixed plate away from the air box, and a filter plate is fixedly connected to the end of the vibration cylinder away from the fixed plate. A vibration spring is fixedly connected between the filter plate and the fixed plate. The outer wall of the filter plate is in contact with the inner wall of the air inlet channel, and the vibration spring is sleeved on the outside of the vibration cylinder.

[0009] To facilitate uniform preheating of the pick-and-place machine, the air distribution unit further includes an extension tube. A limiting groove is fixedly connected to the inner wall of the extension tube. A rotating ring is slidably connected inside the limiting groove. Two sets of guide plates are fixedly connected to the inner wall of the rotating ring. An inclined ring is fixedly connected to the side of the rotating ring near the exhaust channel. Multiple sets of spiral blades are fixedly connected to the inclined ring. The outer wall of the rotating ring is in close contact with the inner wall of the limiting groove. The end of the guide plate away from the exhaust channel is inclined towards each other. The side of the inclined ring near the exhaust channel is inclined, and the inclined ring is in contact with the inner wall of the extension tube.

[0010] To facilitate adjustment of the rotation speed of the air distribution unit according to the specific conditions of the pick and place machine, an adjusting bolt is further included on the side of the extension tube near the limiting groove. The adjusting bolt passes through the extension tube into the limiting groove and is bolted to the side wall of the extension tube and the limiting groove.

[0011] To facilitate the detection of the preheating status of the pick-and-place machine, the control unit further includes a bimetallic strip fixedly connected to the end of the guide plate away from the extension tube. A hinge is fixedly connected to the side of the bimetallic strip that is close to each other. A sleeve and a slide rod are rotatably connected to the two sets of hinges respectively. When the temperature of the air passing through the bimetallic strip increases, the bimetallic strip bends in the opposite direction. Part of the slide rod extends into the interior of the sleeve. A variable resistance mechanism is provided between the slide rod and the sleeve.

[0012] To facilitate adjustment of the preheating speed of the pick-and-place machine, ensure preheating efficiency, and reduce hot air waste, the variable resistance mechanism further includes a resistance ring and a slip ring. The resistance ring is fixedly connected to the inner wall of the sleeve, and the slip ring is fixedly connected to the outer wall of the slide rod. A return spring is fixedly connected between the slide rod and the bottom of the sleeve. The resistance ring and the slip ring are tightly fitted together, and the resistance ring and the slip ring are electrically connected to the drive motor. When the slip ring moves downward along the resistance ring, the resistance connected to the drive motor increases.

[0013] To facilitate the vibration of the dustproof unit and reduce dust adsorption on the dustproof unit, the drive unit further includes a rotating plate fixedly connected to the guide plate near one end of the extension tube. A mounting plate is fixedly connected to the inner wall of the extension tube near the rotating plate, and a compression cylinder is fixedly connected to the mounting plate near the rotating plate. The end of the rotating plate near the compression cylinder is arc-shaped, and the compression cylinder is spiral-shaped and fits against the inner wall of the extension tube.

[0014] To facilitate the disassembly of the preheating equipment and reduce the space occupied by the equipment when not in use, the device further includes a mounting collar fixedly connected to the exhaust channel. One end of the extension pipe air box is inserted into the mounting collar, and the inner diameter of the exhaust channel matches the inner diameter of the extension pipe.

[0015] A preheating method for a pick-and-place machine preheating device includes the following steps:

[0016] Step 1: First, move the air box to the vicinity of the pick and place machine, and insert the air distribution unit and control unit into the hollow part of the pick and place machine, so that the air distribution unit is close to the part of the pick and place machine that needs to be preheated;

[0017] Step 2: The preheating unit draws outside air into the air box, heats it, and then discharges it to the pick and place machine through the air distribution unit. At the same time, the air distribution unit will rotate to prevent uneven preheating of the pick and place machine.

[0018] Step 3: During the operation of the pick and place machine, the dustproof unit can prevent dust in the air from being blown towards the pick and place machine, thereby ensuring the stability of the pick and place machine's operation;

[0019] Step 4: Based on the preheating status of the pick-and-place machine, the distance between the control units will be changed, and the value of the preheating unit connection resistor will be adjusted to automatically control the preheating status of the pick-and-place machine and adjust the output power of the preheating unit.

[0020] Step 5: When the air distribution unit rotates, it will intermittently compress the drive unit and deliver the compressed gas to the dustproof unit, causing the dustproof unit to vibrate and preventing the dustproof unit from becoming blocked.

[0021] Compared with the prior art, the present invention provides a preheating device and method for a chip mounter, which has the following beneficial effects:

[0022] 1. This pick-and-place machine preheating equipment can draw in outside air into the air box and heat it through the preheating unit to preheat the pick-and-place machine. At the same time, with the help of the dustproof unit, it can prevent dust in the air from being blown towards the pick-and-place machine, thereby ensuring that the pick-and-place machine can work normally.

[0023] 2. This pick-and-place machine preheating equipment can drive the air distribution unit to rotate through the preheating unit. At the same time, the air distribution unit can reduce the ineffective loss of hot air, which not only improves the preheating efficiency of the pick-and-place machine, but also reduces the waste of hot air, greatly reducing the preheating cost of the pick-and-place machine, and makes the preheating of the pick-and-place machine more uniform, which is beneficial to the operation of the pick-and-place machine.

[0024] 3. The preheating equipment of this pick and place machine can automatically adjust the output power of the preheating unit according to the preheating status of the pick and place machine through the control unit, so as to avoid the pick and place machine from tilting due to excessively fast preheating rate, and ensure the stable operation of the pick and place machine and product quality.

[0025] 4. The preheating equipment of this pick and place machine can intermittently compress the drive unit through the air distribution unit and introduce the compressed gas into the dustproof unit, causing the dustproof unit to vibrate. This can clean some of the dust on the dustproof unit, which can not only reduce the cleaning frequency of the dustproof unit, but also avoid blockage during the preheating process, further improving the preheating efficiency and preheating effect of the pick and place machine.

[0026] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention can overcome the problems of low preheating efficiency, serious waste of hot air, and uneven preheating in pick-and-place machines. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a preheating device for a chip mounter proposed in this invention. Figure 1 .

[0028] Figure 2 This is a schematic diagram of the structure of a preheating device for a chip mounter proposed in this invention. Figure 2 .

[0029] Figure 3 This is a cross-sectional structural diagram of a preheating device for a chip mounter proposed in this invention.

[0030] Figure 4 This is a partial structural schematic diagram of a preheating device for a chip mounter proposed in this invention.

[0031] Figure 5This is a partial cross-sectional structural diagram of the sleeve and compression rod in a preheating device for a chip mounter proposed in this invention.

[0032] Figure 6 This invention provides a preheating device for a chip mounter. Figure 3 A schematic diagram of the structure of part A.

[0033] Figure 7 This invention provides a preheating device for a chip mounter. Figure 3 A schematic diagram of the structure of part B.

[0034] In the diagram: 1. Airbox; 2. Intake channel; 3. Exhaust channel; 4. Heater; 5. Mounting bracket; 6. Drive motor; 7. Fan; 8. Fixing plate; 9. Vibration cylinder; 10. Filter plate; 11. Vibration spring; 12. Mounting collar; 13. Extension tube; 14. Limiting groove; 15. Rotating ring; 16. Adjusting bolt; 17. Tilting ring; 18. Spiral blade; 19. Guide plate; 20. Bimetallic strip; 21. Hinge; 22. Sleeve; 23. Slide rod; 24. Return spring; 25. Resistance ring; 26. Slip ring; 27. Rotating plate; 28. Mounting plate; 29. ​​Compression cylinder. Detailed Implementation

[0035] 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Example 1:

[0038] Reference Figures 1-7A preheating device for a pick-and-place machine includes an air box 1. The air box 1 is a conventional device in the prior art and will not be described in detail. It can also be moved by installing wheels at the bottom of the air box 1. The device further includes: a preheating unit mounted on the air box 1, used to draw in outside air, heat it, and discharge it in the opposite direction; a dustproof unit mounted within the preheating unit, used to block dust in the air when it is drawn into the air box 1; an air distribution unit mounted on the side of the preheating unit away from the dustproof unit, which drives the air distribution unit to rotate, guiding and evenly distributing the discharged hot air towards the pick-and-place machine; a control unit mounted on the air distribution unit, electrically connected to the preheating unit, whose resistance increases as the temperature of the pick-and-place machine rises; and a drive unit mounted within the air distribution unit, connected to the dustproof unit via a pipe, allowing the air distribution unit to intermittently contact the drive unit.

[0039] Reference Figures 1-3 The preheating unit includes an air intake channel 2 and an exhaust channel 3 installed on the air box 1. A heater 4 is installed inside the air box 1. A mounting bracket 5 is fixedly connected to the inner wall of the exhaust channel 3. A drive motor 6 is fixedly connected to the mounting bracket 5. A fan 7 is rotatably connected to the side of the mounting bracket 5 away from the drive motor 6. The output end of the drive motor 6 is connected to the fan 7. The air intake channel 2 and the exhaust channel 3 are located on opposite sides of the air box 1, and both the air intake channel 2 and the exhaust channel 3 are connected to the air box 1. The fan 7 is in contact with the inner wall of the exhaust channel 3.

[0040] During operation, the drive motor 6 drives the fan 7 to rotate, and at the same time the heater 4 is turned on. When the fan 7 rotates, it will transport the surrounding air and discharge it through the exhaust channel 3, so that the air box 1 is in a negative pressure state. At this time, the outside air can enter the air box 1 through the air intake channel 2 and be heated by the heater 4. The heated air flows to the pick and place machine to preheat the pick and place machine.

[0041] Reference Figure 3 and Figure 6 The dustproof unit includes multiple sets of fixing plates 8 fixedly connected to the inner wall of the air intake channel 2. A vibration cylinder 9 is fixedly connected to the side of the fixing plate 8 away from the air box 1. A filter plate 10 is fixedly connected to the end of the vibration cylinder 9 away from the fixing plate 8. A vibration spring 11 is fixedly connected between the filter plate 10 and the fixing plate 8. The outer wall of the filter plate 10 is in contact with the inner wall of the air intake channel 2, and the vibration spring 11 is sleeved on the outside of the vibration cylinder 9.

[0042] The specific structure of the filter plate 10 can be referred to in the existing technical solutions, which are known to those skilled in the art and will not be elaborated here. The filter plate 10 can realize the flow of air, but it will block dust. When the air pressure in the vibrating cylinder 9 increases, it will drive the vibrating cylinder 9 to extend outward, thereby driving the filter plate 10 to move. At this time, the vibrating spring 11 is in a stretched state. When the air pressure in the vibrating cylinder 9 decreases, the vibrating cylinder 9 will move back to the initial position under the action of the vibrating spring 11. By continuously changing the air pressure in the vibrating cylinder 9, the vibration of the filter plate 10 can be realized, shaking off some of the dust adsorbed on the filter plate 10 and ensuring the stability of the gas flow. It should be noted that the number of vibrating cylinders 9 is not limited here, as long as the stable vibration of the filter plate 10 can be realized and it will not detach from the air inlet channel 2.

[0043] Reference Figures 3-4 The air distribution unit includes an extension pipe 13. A limiting groove 14 is fixedly connected to the inner wall of the extension pipe 13. A rotating ring 15 is slidably connected inside the limiting groove 14. Two sets of guide plates 19 are fixedly connected to the inner wall of the rotating ring 15. An inclined ring 17 is fixedly connected to the side of the rotating ring 15 closest to the exhaust channel 3. Multiple sets of spiral blades 18 are fixedly connected to the inclined ring 17. The outer wall of the rotating ring 15 is tightly fitted with the inner wall of the limiting groove 14. The end of the guide plate 19 away from the exhaust channel 3 is inclined towards each other. The inclined ring 17 is close to the inner wall of the limiting groove 14. One side of the exhaust passage 3 is inclined, and the inclined ring 17 fits against the inner wall of the extension pipe 13. It also includes a mounting collar 12 fixedly connected to the exhaust passage 3. One end of the air box 1 of the extension pipe 13 is inserted into the mounting collar 12. The inner diameter of the exhaust passage 3 matches the inner diameter of the extension pipe 13. It also includes an adjusting bolt 16 set on the side of the extension pipe 13 near the limiting groove 14. The adjusting bolt 16 passes through the extension pipe 13 into the limiting groove 14, and the adjusting bolt 16 is bolted to the side wall of the extension pipe 13 and the limiting groove 14.

[0044] The inner diameter of the extension tube 13 is matched with the exhaust channel 3 to reduce air resistance during airflow. The extension tube 13 can be quickly installed and removed by the mounting ring 12. It should be noted that the shape and size of the extension tube 13 can be adjusted according to the shape and size of the position to be preheated on the pick-and-place machine. When air flows through the extension tube 13, under the action of the spiral blade 18, it will drive the rotating ring 15 to rotate in the limiting groove 14. Then, the hot air is rotated along the position to be preheated on the pick-and-place machine by the guide plate 19, so that the preheating of the pick-and-place machine is more uniform and avoids most of the hot air passing directly through the pick-and-place machine. In addition, the resistance encountered by the rotating ring 15 during rotation can be adjusted by rotating the adjusting bolt 16. The angle of the guide plate 19 can also be adjusted according to the special characteristics of the preheating position of the pick-and-place machine to achieve fixed-point preheating of the pick-and-place machine, which greatly improves the preheating efficiency of the pick-and-place machine, while reducing the waste of hot air and the energy consumption during the preheating process of the pick-and-place machine.

[0045] Reference Figure 1 , Figure 3 and Figure 5 The control unit includes a bimetallic strip 20 fixedly connected to the end of the guide plate 19 away from the extension tube 13. A hinge 21 is fixedly connected to the side of the bimetallic strip 20 that is close to each other. A sleeve 22 and a slide rod 23 are rotatably connected to the two sets of hinges 21 respectively. When the temperature of the air passing through the bimetallic strip 20 increases, the bimetallic strip 20 bends in the opposite direction. Part of the slide rod 23 extends into the interior of the sleeve 22. A variable resistance mechanism is provided between the slide rod 23 and the sleeve 22. The variable resistance mechanism includes a resistance ring 25 and a slip ring 26. The resistance ring 25 is fixedly connected to the inner wall of the sleeve 22, and the slip ring 26 is fixedly connected to the outer wall of the slide rod 23. A return spring 24 is fixedly connected between the slide rod 23 and the bottom of the sleeve 22. The resistance ring 25 and the slip ring 26 are tightly fitted together. The resistance ring 25 and the slip ring 26 are electrically connected to the drive motor 6. When the slip ring 26 moves downward along the resistance ring 25, the resistance connected to the drive motor 6 increases.

[0046] Since the initial temperature of the pick-and-place machine is relatively low, there will be a significant temperature difference when air flows from the guide plate 19 to the end of the bimetallic strip 20. As preheating progresses, this temperature difference will continuously decrease, causing the bending degree of the bimetallic strip 20 to change. At this time, the preheating efficiency of the pick-and-place machine can be adjusted by increasing the speed of the drive motor 6. At the same time, the bimetallic strip 20 can reduce the direct blowing of hot air onto the pick-and-place machine, avoiding overheating. While improving the preheating efficiency of the pick-and-place machine, the preheating effect can also be guaranteed. It should be noted that the specific structure of the bimetallic strip 20 can be referred to in the technical solutions of the prior art, which will be known to those skilled in the art, and will not be elaborated here.

[0047] Reference Figure 3The drive unit includes a rotating plate 27 fixedly connected to one end of the guide plate 19 near the extension tube 13. An mounting plate 28 is fixedly connected to the inner wall of the extension tube 13 near the rotating plate 27. A compression cylinder 29 is fixedly connected to the mounting plate 28 near the rotating plate 27. The end of the rotating plate 27 near the compression cylinder 29 is arc-shaped, and the compression cylinder 29 is spiral-shaped and fits against the inner wall of the extension tube 13.

[0048] When the rotating ring 15 rotates, it drives the rotating plate 27 to rotate. When the rotating plate 27 contacts the compression cylinder 29, it causes the compression cylinder 29 to contract inward, compressing the gas inside and delivering the gas to the vibrating cylinder 9. When the rotating ring 15 rotates to a certain angle, it will disengage from the compression cylinder 29, and the gas in the vibrating cylinder 9 will flow back into the compression cylinder 29. By intermittently contracting the compression cylinder 29, the vibrating cylinder 9 can be driven to extend and contract repeatedly, thereby driving the filter plate 10 to vibrate.

[0049] Example 2:

[0050] A preheating method for a pick-and-place machine preheating device includes the following steps:

[0051] Step 1: First, move the air box 1 to the vicinity of the pick and place machine, and insert the air distribution unit and control unit into the hollow part of the pick and place machine, so that the air distribution unit is close to the part of the pick and place machine that needs to be preheated;

[0052] The bellows 1 can be moved to a designated position using the wheels, and the tilt angle of the wind distribution unit can be adjusted accordingly.

[0053] Step 2: The preheating unit draws outside air into the air box 1, and after heating, it is discharged to the pick and place machine by the air distribution unit. At the same time, the air distribution unit will rotate to avoid uneven preheating of the pick and place machine.

[0054] The air distribution unit can guide the flow of hot air and reduce the waste of hot air.

[0055] Step 3: During the operation of the pick and place machine, the dustproof unit can prevent dust in the air from being blown towards the pick and place machine, thereby ensuring the stability of the pick and place machine's operation;

[0056] Step 4: Based on the preheating status of the pick-and-place machine, the distance between the control units will be changed, and the value of the preheating unit connection resistor will be adjusted to automatically control the preheating status of the pick-and-place machine and adjust the output power of the preheating unit.

[0057] The preheating progress of the pick-and-place machine varies, and the degree of cooling of the hot air will also vary. The degree of cooling of the hot air can be used to detect the preheating status of the pick-and-place machine.

[0058] Step 5: When the air distribution unit rotates, it will intermittently compress the drive unit and deliver the compressed gas to the dustproof unit, causing the dustproof unit to vibrate and preventing the dustproof unit from becoming blocked.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A preheating device for a chip mounter, comprising a blower (1), characterized in that, Also includes: The preheating unit installed on the air box (1) is used to draw outside air into the air box (1) for heating and discharge it in the opposite direction; The dustproof unit installed in the preheating unit is used to block dust in the air when air is drawn into the air box (1); The air distribution unit is located on the side of the preheating unit away from the dustproof unit. The preheating unit can drive the air distribution unit to rotate, which is used to guide the exhaust hot air and evenly discharge it to the pick and place machine. The control unit is installed on the air distribution unit and is electrically connected to the preheating unit. When the temperature of the pick-and-place machine rises, the resistance connected to the control unit increases. The drive unit is installed within the air distribution unit, and the drive unit is connected to the dustproof unit via a pipe. The air distribution unit can intermittently contact the drive unit.

2. The preheating equipment for a chip mounter according to claim 1, characterized in that, The preheating unit includes an air inlet channel (2) and an exhaust channel (3) disposed on a wind box (1). A heater (4) is disposed inside the wind box (1). A mounting bracket (5) is fixedly connected to the inner side wall of the exhaust channel (3). A drive motor (6) is fixedly connected to the mounting bracket (5). A fan (7) is rotatably connected to the side of the mounting bracket (5) away from the drive motor (6). The output end of the drive motor (6) is connected to the fan (7). The air intake channel (2) and the exhaust channel (3) are located on opposite sides of the air box (1), and both the air intake channel (2) and the exhaust channel (3) are connected to the air box (1). The fan (7) is in contact with the inner wall of the exhaust channel (3).

3. The preheating equipment for a chip mounter according to claim 2, characterized in that, The dustproof unit includes multiple sets of fixed plates (8) fixedly connected to the inner wall of the air intake channel (2). A vibration cylinder (9) is fixedly connected to the side of the fixed plate (8) away from the air box (1). A filter plate (10) is fixedly connected to the end of the vibration cylinder (9) away from the fixed plate (8). A vibration spring (11) is fixedly connected between the filter plate (10) and the fixed plate (8). The outer wall of the filter plate (10) is in contact with the inner wall of the air intake channel (2), and the vibration spring (11) is sleeved on the outside of the vibration cylinder (9).

4. The preheating equipment for a chip mounter according to claim 3, characterized in that, The air distribution unit includes an extension pipe (13), a limiting groove (14) is fixedly connected to the inner wall of the extension pipe (13), a rotating ring (15) is slidably connected inside the limiting groove (14), two sets of guide plates (19) are fixedly connected to the inner wall of the rotating ring (15), and an inclined ring (17) is fixedly connected to the side of the rotating ring (15) near the exhaust channel (3), and multiple sets of spiral blades (18) are fixedly connected to the inclined ring (17). The outer wall of the rotating ring (15) is closely fitted with the inner wall of the limiting groove (14), the end of the guide plate (19) away from the exhaust channel (3) is inclined towards each other, the side of the inclined ring (17) close to the exhaust channel (3) is inclined, and the inclined ring (17) is fitted with the inner wall of the extension pipe (13).

5. A preheating device for a chip mounter according to claim 4, characterized in that, It also includes an adjusting bolt (16) disposed on the side of the extension tube (13) near the limiting groove (14). The adjusting bolt (16) extends from the extension tube (13) into the limiting groove (14), and the adjusting bolt (16) is bolted to the side wall of the extension tube (13) and the limiting groove (14).

6. The preheating equipment for a chip mounter according to claim 4, characterized in that, The control unit includes a bimetallic strip (20) fixedly connected to the end of the guide plate (19) away from the extension tube (13). A hinge (21) is fixedly connected to the side of the bimetallic strip (20) that is close to each other. A sleeve (22) and a slide rod (23) are rotatably connected to the two sets of hinges (21), respectively. When the temperature of the air passing through the bimetallic strip (20) rises, the bimetallic strip (20) bends in opposite directions, and part of the slide rod (23) extends into the interior of the sleeve (22). A variable resistance mechanism is provided between the slide rod (23) and the sleeve (22).

7. A preheating device for a chip mounter according to claim 6, characterized in that, The variable resistance mechanism includes a resistance ring (25) and a slip ring (26). The resistance ring (25) is fixedly connected to the inner wall of the sleeve (22), and the slip ring (26) is fixedly connected to the outer wall of the slide rod (23). A return spring (24) is fixedly connected between the slide rod (23) and the bottom of the sleeve (22). The resistor ring (25) and the slip ring (26) are closely fitted together, and the resistor ring (25) and the slip ring (26) are electrically connected to the drive motor (6). When the slip ring (26) moves downward along the resistor ring (25), the resistance connected to the drive motor (6) increases.

8. A preheating device for a chip mounter according to claim 4, characterized in that, The drive unit includes a rotating plate (27) fixedly connected to one end of the guide plate (19) near the extension tube (13), a mounting plate (28) fixedly connected to the inner wall of the extension tube (13) near the rotating plate (27), and a compression cylinder (29) fixedly connected to the mounting plate (28) near the rotating plate (27). The rotating plate (27) is arranged in an arc shape at one end near the compression cylinder (29), and the compression cylinder (29) is arranged in a spiral shape and fits against the inner wall of the extension tube (13).

9. A preheating device for a chip mounter according to claim 4, characterized in that, It also includes a mounting collar (12) fixedly connected to the exhaust channel (3), one end of the extension pipe (13) air box (1) is inserted into the mounting collar (12), and the inner diameter of the exhaust channel (3) matches the inner diameter of the extension pipe (13).

10. A preheating method comprising the preheating equipment for a pick-and-place machine according to any one of claims 1-9, characterized in that, It also includes the following steps: Step 1: First, move the air box (1) to the vicinity of the pick and place machine, and insert the air distribution unit and control unit into the hollow part of the pick and place machine, so that the air distribution unit is close to the part of the pick and place machine that needs to be preheated; Step 2: The air from the outside is drawn into the air box (1) through the preheating unit. After being heated, the air is discharged to the pick and place machine by the air distribution unit. At the same time, the air distribution unit will be rotated to avoid uneven preheating of the pick and place machine. Step 3: During the operation of the pick and place machine, the dustproof unit can prevent dust in the air from being blown towards the pick and place machine, thereby ensuring the stability of the pick and place machine's operation; Step 4: Based on the preheating status of the pick-and-place machine, the distance between the control units will be changed, and the value of the resistor connected to the preheating unit will be adjusted to automatically control the preheating status of the pick-and-place machine and adjust the output power of the preheating unit. Step 5: When the air distribution unit rotates, it will intermittently compress the drive unit and deliver the compressed gas to the dustproof unit, causing the dustproof unit to vibrate and preventing the dustproof unit from becoming blocked.

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