Chip mounter preheating equipment and method

Abstract

The invention discloses chip mounter preheating equipment and method, and belongs to the field of chip mounter preheating. A chip mounter preheating device comprises an air bellow and further comprises a preheating unit arranged on the air bellow and used for sucking external air into the air bellow to be heated and discharging the external air in the opposite direction; the dustproof unit is arranged in the preheating unit and used for blocking dust in the air when the air is sucked into the air bellow; the air uniformizing unit is arranged on one side, far away from the dustproof unit, of the preheating unit, and the preheating unit can drive the air uniformizing unit to rotate and is used for guiding the discharged hot air and uniformly discharging the hot air to the chip mounter; the control unit is arranged on the air uniformizing unit, the control unit is electrically connected with the preheating unit, and when the temperature of the chip mounter rises, the resistance connected to the control unit is increased; the problems that the chip mounter is low in preheating efficiency, hot air is seriously wasted, and preheating is uneven can be solved.

Description

Technical Field

[0001] The present invention relates to the field of chip mounter preheating technology, and in particular to a chip mounter preheating device and method. Background Art

[0002] The preheating equipment of the SMT machine is mainly divided into two parts: power-on preheating and warm-up. Power-on preheating mainly acts on the circuit, which usually takes only a few minutes to complete, while warm-up mainly acts on the mechanical part to ensure that the lubrication system of the mechanical parts can work normally and reach the appropriate temperature, so that the entire equipment can reach the best state in the next work, which usually takes dozens of minutes.

[0003] At present, most of the SMT machines preheat different positions of the SMT machines by blowing out hot air through preheating equipment. Since there is a large space inside the SMT machine, a large amount of hot air will directly pass through the SMT machine during preheating, which not only makes the SMT machine preheat take a long time, but also causes a large amount of hot air to be wasted, greatly increasing the energy consumption of the SMT machine preheating; in addition, the preheating of the SMT machine is uneven, which has an adverse effect on the operation of the SMT machine. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of low preheating efficiency, serious waste of hot air and uneven preheating of the chip mounter in the prior art, and to propose a preheating device and method for the chip mounter.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A preheating device for a placement machine comprises a bellows, and further comprises: a preheating unit arranged on the bellows, used to draw external air into the bellows for heating and discharge it in the opposite direction; a dustproof unit arranged in the preheating unit, used to block dust in the air when air is drawn into the bellows; an air balancing unit arranged on a side of the preheating unit away from the dustproof unit, the preheating unit can drive the air balancing unit to rotate, and is used to guide the discharged hot air and discharge it evenly to the placement machine; a control unit arranged on the air balancing unit, the control unit is electrically connected to the preheating unit, and when the temperature of the placement machine rises, the resistance connected to the control unit increases; a driving unit arranged in the air balancing unit, the driving unit and the dustproof unit are connected through a pipeline, and the air balancing unit can intermittently contact the driving unit.

[0007] In order to facilitate preheating of the placement machine, preferably, the preheating unit includes an air intake channel and an exhaust channel arranged on the bellows, a heater is arranged inside the bellows, a mounting bracket is fixedly connected to the inner side wall of the exhaust channel, a driving motor is fixedly connected to the mounting bracket, a fan is rotatably connected to the side of the mounting bracket away from the driving motor, and the output end of the driving motor is connected to the fan, wherein the air intake channel and the exhaust channel are located on opposite sides of the bellows, and the air intake channel and the exhaust channel are both connected to the bellows, and the fan fits the inner side wall of the exhaust channel.

[0008] In order to ensure the stability of gas flow and reduce the impact of dust on the placement machine, the dustproof unit further includes a plurality of fixed plates fixedly connected to the inner wall of the air inlet channel, the side of the fixed plate away from the bellows is fixedly connected to a vibrating cylinder, the end of the vibrating cylinder away from the fixed plate is fixedly connected to a filter plate, a vibration spring is fixedly connected between the filter plate and the fixed plate, wherein 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] In order to facilitate uniform preheating of the placement machine, further, the air equalizing unit includes an extension tube, the inner wall of the extension tube is fixedly connected to a limiting groove, the inner part of the limiting groove is slidably connected to a rotating ring, the inner wall of the rotating ring is fixedly connected to two groups of guide plates, the side of the rotating ring close to the exhaust channel is fixedly connected to an inclined ring, and the inclined ring is fixedly connected to a plurality of groups of spiral sheets, wherein the outer wall of the rotating ring is tightly fitted 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 close to the exhaust channel is inclined, and the inclined ring is fitted with the inner wall of the extension tube.

[0010] In order to facilitate the adjustment of the rotation speed of the air equalizing unit according to the specific situation of the placement machine, it further includes an adjusting bolt arranged on the side of the extension tube close to the limit slot, the adjusting bolt passes through the extension tube to the inside of the limit slot, and the adjusting bolt is bolted to the extension tube and the side wall of the limit slot.

[0011] In order to facilitate the detection of the preheating condition of the placement machine, the control unit further includes a bimetallic strip fixedly connected to the end of the guide plate away from the extension tube, and the bimetallic strips are fixedly connected to a hinge on one side close to each other, and two groups of hinges are rotatably connected to a sleeve and a sliding rod, wherein when the temperature of the air passing through the bimetallic strip rises, the bimetallic strip bends in opposite directions, and part of the sliding rod extends to the interior of the sleeve, and a variable resistance mechanism is arranged between the sliding rod and the sleeve.

[0012] In order to facilitate the adjustment of the preheating speed of the placement machine and ensure the preheating efficiency, the waste of hot air can be reduced. Furthermore, the variable resistance mechanism includes a resistance ring and a slip ring, the resistance ring is fixedly connected to the inner wall of the sleeve, the slip ring is fixedly connected to the outer wall of the slide rod, and a reset spring is fixedly connected between the slide rod and the bottom of the sleeve, wherein the resistance ring and the slip ring are tightly fitted, 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] In order to facilitate the vibration of the dustproof unit and reduce the adsorption of dust on the dustproof unit, the driving unit further includes a rotating plate fixedly connected to the guide plate near one end of the extension tube, and a mounting plate is fixedly connected to the side of the inner wall of the extension tube near the rotating plate, and a compression cylinder is fixedly connected to the side of the mounting plate near the rotating plate, wherein the end of the rotating plate near the compression cylinder is arranged in an arc shape, and the compression cylinder is arranged in a spiral shape and fits with the inner wall of the extension tube.

[0014] In order to facilitate the disassembly of the preheating equipment and reduce the space occupied by the equipment when not in use, it further includes a mounting collar fixedly connected to the exhaust passage, one end of the extension pipe bellows is inserted into the mounting collar, and the inner diameter of the exhaust passage matches the inner diameter of the extension pipe.

[0015] A preheating method for a chip mounter preheating device comprises the following steps:

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

[0017] Step 2: The outside air is sucked into the bellows through the preheating unit, and after heating, it is discharged to the SMT machine through the air balancing unit, which will also drive the air balancing unit to rotate to avoid uneven preheating of the SMT machine.

[0018] Step 3: When the SMT machine is working, the dust-proof unit can prevent dust in the air from blowing towards the SMT machine, thereby ensuring the stability of the SMT machine's operation;

[0019] Step 4: According to the preheating condition of the placement machine, the distance between the control units will be changed, and the size of the resistor connected to the preheating unit will be adjusted to automatically control the preheating condition of the placement machine and adjust the output power of the preheating unit;

[0020] Step 5: When the air balancing unit rotates, it will intermittently compress the driving unit and transmit the compressed gas of the driving unit to the dustproof unit, driving the dustproof unit to vibrate and avoid blockage of the dustproof unit.

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

[0022] 1. The preheating device of the SMT machine can draw outside air into the bellows and heat it through the preheating unit, so as to preheat the SMT machine. At the same time, under the action of the dustproof unit, the dust in the air can be prevented from being blown to the SMT machine, thereby ensuring that the SMT machine can work normally.

[0023] 2. The preheating equipment of the SMT machine 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 SMT machine, but also reduces the waste of hot air, greatly reduces the preheating cost of the SMT machine, and makes the preheating of the SMT machine more uniform, which is beneficial to the operation of the SMT machine.

[0024] 3. The preheating equipment of the placement machine can automatically adjust the output power of the preheating unit according to the preheating status of the placement machine through the control unit, so as to avoid the placement machine from warping due to too fast preheating temperature rise rate, thereby ensuring the stable operation of the placement machine and product quality.

[0025] 4. The preheating equipment of the SMT machine can intermittently compress the driving unit through the air equalizing unit, and pass the compressed gas into the dustproof unit to drive the dustproof unit to vibrate, so as to clean some dust on the dustproof unit. It can not only reduce the cleaning frequency of the dustproof unit, but also avoid blockage during the preheating process, thereby further improving the preheating efficiency and preheating effect of the SMT machine.

[0026] The parts not involved in the device are the same as the prior art or can be implemented by using the prior art. The present invention can overcome the problems of low preheating efficiency, serious waste of hot air and uneven preheating of the placement machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a chip placement machine preheating device proposed by the present invention Figure 1 .

[0028] Figure 2 A schematic diagram of the structure of a chip placement machine preheating device proposed by the present invention Figure 2 .

[0029] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of a chip placement machine preheating device proposed by the present invention.

[0030] Figure 4 The present invention is a partial structural schematic diagram of a chip placement machine preheating device proposed by the present invention.

[0031] Figure 5The present invention provides a schematic diagram of the partial cross-sectional structure of a sleeve and a compression rod in a chip placement machine preheating device.

[0032] Figure 6 A chip placement machine preheating device proposed by the present invention Figure 3 Schematic diagram of the structure of part A.

[0033] Figure 7 A chip placement machine preheating device proposed by the present invention Figure 3 Schematic diagram of the structure of part B.

[0034] In the figure: 1. bellows; 2. air inlet 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 pipe; 14. limit groove; 15. rotating ring; 16. adjusting bolt; 17. tilting ring; 18. spiral sheet; 19. guide plate; 20. bimetallic sheet; 21. hinge; 22. sleeve; 23. slide rod; 24. reset spring; 25. resistance ring; 26. slip ring; 27. rotating plate; 28. mounting plate; 29. ​​compression cylinder. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] Embodiment 1:

[0038] Reference Figure 1-Figure 7, a preheating device for a placement machine, including a bellows 1, which is a conventional means in the prior art, so it is not described in detail. It can also be possible to install walking wheels at the bottom of the bellows 1 to facilitate the movement of the bellows 1, and also includes: a preheating unit arranged on the bellows 1, used to suck the outside air into the bellows 1 for heating and discharge it in the opposite direction; a dust-proof unit arranged in the preheating unit, used to block dust in the air when the air is sucked into the bellows 1; an air balancing unit arranged on the side of the preheating unit away from the dust-proof unit, the preheating unit can drive the air balancing unit to rotate, and is used to guide the exhausted hot air and discharge it evenly to the placement machine; a control unit arranged on the air balancing unit, the control unit is electrically connected to the preheating unit, when the temperature of the placement machine rises, the resistance connected to the control unit increases; a driving unit arranged in the air balancing unit, the driving unit and the dust-proof unit are connected through a pipeline, and the air balancing unit can intermittently contact the driving unit.

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

[0040] During operation, the driving motor 6 drives the fan 7 to rotate, and the heater 4 is turned on at the same time. When the fan 7 rotates, it will convey the surrounding air and discharge it through the exhaust channel 3, so that the inside of the bellows 1 is in a negative pressure state. At this time, the outside air can enter the bellows 1 through the air inlet channel 2, and the air is heated by the heater 4, so that the heated hot air flows to the placement machine, thereby preheating the placement machine.

[0041] Reference Figure 3 and Figure 6 The dustproof unit includes a plurality of fixed plates 8 fixedly connected to the inner wall of the air inlet channel 2, a vibrating cylinder 9 is fixedly connected to the side of the fixed plate 8 away from the bellows 1, a filter plate 10 is fixedly connected to the end of the vibrating cylinder 9 away from the fixed plate 8, a vibrating spring 11 is fixedly connected between the filter plate 10 and the fixed plate 8, wherein the outer wall of the filter plate 10 is in contact with the inner wall of the air inlet channel 2, and the vibrating spring 11 is sleeved on the outside of the vibrating cylinder 9.

[0042] The specific structure of the filter plate 10 can refer to the technical solutions in the prior art. Those skilled in the art will know that it will not be elaborated here. The filter plate 10 can realize the flow of wind, but will block the dust. When the air pressure in the vibration cylinder 9 increases, it will drive the vibration cylinder 9 to extend outward, thereby driving the filter plate 10 to move. At this time, the vibration spring 11 is in a stretched state. When the air pressure in the vibration cylinder 9 decreases, the vibration cylinder 9 will move to the initial position under the action of the vibration spring 11. By continuously changing the air pressure in the vibration cylinder 9, the vibration of the filter plate 10 can be achieved, and part of the dust adsorbed on the filter plate 10 can be shaken off to ensure the stability of the gas flow. It should be explained that the number of vibration cylinders 9 is not limited here, as long as the stable vibration of the filter plate 10 can be achieved and it will not be separated from the air intake channel 2.

[0043] Reference Figure 3-Figure 4 The air balancing unit includes an extension tube 13, a limiting groove 14 is fixedly connected to the inner wall of the extension tube 13, a rotating ring 15 is slidably connected inside the limiting groove 14, two groups of guide plates 19 are fixedly connected to the inner wall of the rotating ring 15, a tilting ring 17 is fixedly connected to the side of the rotating ring 15 close to the exhaust passage 3, and a plurality of groups of spiral plates 18 are fixedly connected to the tilting ring 17, wherein 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 passage 3 is inclined toward each other, and the tilting ring 17 is close to the exhaust passage 3. One side of the exhaust channel 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 channel 3. One end of the bellows 1 of the extension pipe 13 is inserted into the mounting collar 12. The inner diameter of the exhaust channel 3 matches the inner diameter of the extension pipe 13. It also includes an adjusting bolt 16 arranged on the side of the extension pipe 13 close to the limiting groove 14. The adjusting bolt 16 passes through the extension pipe 13 to the inside of the limiting groove 14, and the adjusting bolt 16 is bolted to the extension pipe 13 and the side wall of the limiting groove 14.

[0044] The inner diameter of the extension tube 13 matches the exhaust channel 3 in order to reduce the resistance of air during flow. The extension tube 13 can be quickly disassembled and assembled by installing the collar 12. It should be explained that the shape and size of the extension tube 13 can be adjusted according to the shape and size of the position where the SMT machine needs to be preheated. When air flows through the extension tube 13, under the action of the spiral blade 18, the rotating ring 15 will be driven to rotate in the limit groove 14, and then the hot air will be rotated along the position of the SMT machine to be preheated through the guide plate 19, so that the preheating of the SMT machine is more uniform and most of the hot air can be prevented from passing directly through the SMT machine. In addition, the resistance encountered by the rotating ring 15 during rotation can be adjusted by rotating the adjusting bolt 16, and the angle of the guide plate 19 can be adjusted according to the particularity of the preheating position of the SMT machine to achieve fixed-point preheating of the SMT machine, which greatly improves the preheating efficiency of the SMT machine, while reducing the waste of hot air and the energy consumption during the preheating process of the SMT machine.

[0045] Reference Figure 1 , Figure 3 and Figure 5 The control unit includes a bimetallic strip 20 fixedly connected to an 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, and a sleeve 22 and a slide rod 23 are rotatably connected to the two sets of hinges 21, wherein when the temperature of the air passing through the bimetallic strip 20 increases, the bimetallic strip 20 bends in opposite directions, and a portion of the slide rod 23 extends to the inside of the sleeve 22, and a variable resistance mechanism is arranged between the slide rod 23 and the sleeve 22, and 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, the slip ring 26 is fixedly connected to the outer wall of the slide rod 23, and a reset spring 24 is fixedly connected between the slide rod 23 and the bottom of the sleeve 22, wherein the resistance ring 25 and the slip ring 26 are tightly fitted, and the resistance ring 25 and the slip ring 26 are electrically connected to the drive motor 6, and when the slip ring 26 moves downward along the resistance ring 25, the resistance connected to the drive motor 6 increases.

[0046] Since the temperature of the SMT machine is relatively low at the beginning, there will be an obvious temperature difference when the air flows from the guide plate 19 to the end of the bimetallic strip 20. As the preheating progresses, this temperature difference will continue to shrink, thereby changing the degree of bending of the bimetallic strip 20. At this time, the preheating efficiency of the SMT machine can be adjusted by increasing the speed of the drive motor 6. At the same time, the bimetallic strip 20 can slow down the degree of direct blowing of hot air on the SMT machine to avoid over-preheating of the SMT machine. While improving the preheating efficiency of the SMT machine, the preheating effect of the SMT machine can also be guaranteed. It should be explained that the specific structure of the bimetallic strip 20 can refer to the technical solutions in the prior art, which can be known to technicians in this field and will not be elaborated here.

[0047] Reference Figure 3The driving 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 is fixedly connected to one side of the inner wall of the extension tube 13 near the rotating plate 27, and a compression cylinder 29 is fixedly connected to one side of the mounting plate 28 near the rotating plate 27, wherein one end of the rotating plate 27 near the compression cylinder 29 is arranged in an arc shape, and the compression cylinder 29 is arranged in a spiral shape, which fits the inner wall of the extension tube 13.

[0048] When the rotating ring 15 rotates, it will drive the rotating plate 27 to rotate. When the rotating plate 27 contacts the compression cylinder 29, it will cause the compression cylinder 29 to contract inward, compress the gas inside, and transport the gas to the vibration cylinder 9. When the rotating ring 15 rotates to a certain angle, it will separate from the compression cylinder 29, and the gas in the vibration cylinder 9 will flow back into the compression cylinder 29. By intermittently contracting the compression cylinder 29, the vibration cylinder 9 can be driven to reciprocately extend and contract, thereby driving the filter plate 10 to vibrate.

[0049] Embodiment 2:

[0050] A preheating method for a chip mounter preheating device comprises the following steps:

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

[0052] The wind box 1 can be moved to a specified position by the walking wheels, and the inclination angle of the wind equalizing unit can be adjusted according to the actual situation;

[0053] Step 2: The outside air is sucked into the wind box 1 through the preheating unit, and after being heated, it is discharged to the placement machine through the air balancing unit, which will also drive the air balancing unit to rotate to avoid uneven preheating of the placement machine;

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

[0055] Step 3: When the SMT machine is working, the dust-proof unit can prevent dust in the air from blowing towards the SMT machine, thereby ensuring the stability of the SMT machine's operation;

[0056] Step 4: According to the preheating condition of the placement machine, the distance between the control units will be changed, and the size of the resistor connected to the preheating unit will be adjusted to automatically control the preheating condition of the placement machine and adjust the output power of the preheating unit;

[0057] The preheating progress of the placement machine is different, and the cooling degree of the hot air is different. The preheating status of the placement machine can be detected by the cooling degree of the hot air.

[0058] Step 5: When the air balancing unit rotates, it will intermittently compress the driving unit and transmit the compressed gas of the driving unit to the dustproof unit, driving the dustproof unit to vibrate and avoid blockage of the dustproof unit.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A chip placement machine preheating device, comprising a bellows (1), characterized in that: Also includes: A preheating unit disposed on the wind box (1) is used to draw external air into the wind box (1) for heating and then discharge it in the opposite direction; A dust prevention unit arranged in the preheating unit, used to block dust in the air when air is sucked into the wind box (1); An air distribution unit is arranged on the side of the preheating unit away from the dustproof unit, and the preheating unit can drive the air distribution unit to rotate, so as to guide the exhausted hot air and evenly discharge it to the placement machine; A control unit is arranged on the air balancing unit, the control unit is electrically connected to the preheating unit, and when the temperature of the placement machine rises, the resistance connected to the control unit increases; The driving unit is arranged in the air balancing unit, the driving unit is connected to the dustproof unit through a pipeline, and the air balancing unit can be in intermittent contact with the driving unit.

2. A chip mounter preheating device according to claim 1, characterized in that: The preheating unit comprises an air inlet passage (2) and an exhaust passage (3) arranged on a wind box (1); a heater (4) is arranged inside the wind box (1); a mounting frame (5) is fixedly connected to the inner side wall of the exhaust passage (3); a driving motor (6) is fixedly connected to the mounting frame (5); a fan (7) is rotatably connected to a side of the mounting frame (5) away from the driving motor (6); an output end of the driving 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 bellows (1), and both the air intake channel (2) and the exhaust channel (3) are connected to the bellows (1), and the fan (7) is in contact with the inner wall of the exhaust channel (3).

3. A chip mounter preheating device according to claim 2, characterized in that: The dustproof unit comprises a plurality of fixed plates (8) fixedly connected to the inner wall of the air inlet passage (2); a side of the fixed plate (8) away from the bellows (1) is fixedly connected to a vibration cylinder (9); an end of the vibration cylinder (9) away from the fixed plate (8) is fixedly connected to a filter plate (10); 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) fits the inner wall of the air inlet passage (2), and the vibration spring (11) is sleeved on the outside of the vibration cylinder (9).

4. A chip mounter preheating device according to claim 3, characterized in that: The air equalizing unit comprises an extension tube (13), a limiting groove (14) is fixedly connected to the inner side wall of the extension tube (13), a rotating ring (15) is slidably connected inside the limiting groove (14), two groups of guide plates (19) are fixedly connected to the inner side wall of the rotating ring (15), a tilting ring (17) is fixedly connected to the side of the rotating ring (15) close to the exhaust passage (3), and a plurality of groups of spiral sheets (18) are fixedly connected to the tilting 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 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 tube (13).

5. A chip mounter preheating device according to claim 4, characterized in that: It also includes an adjusting bolt (16) arranged on a side of the extension tube (13) close to the limiting groove (14); the adjusting bolt (16) passes through the extension tube (13) into the inside of the limiting groove (14); and the adjusting bolt (16) is bolted to the extension tube (13) and the side wall of the limiting groove (14).

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

7. A chip mounter preheating device according to claim 6, characterized in that: The variable resistance mechanism comprises a resistance ring (25) and a slip ring (26); the resistance ring (25) is fixedly connected to the inner wall of the sleeve (22); 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, and 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.

8. A chip mounter preheating device according to claim 4, characterized in that: The driving unit comprises a rotating plate (27) fixedly connected to one end of the guide plate (19) close to the extension tube (13); a mounting plate (28) is fixedly connected to one side of the inner wall of the extension tube (13) close to the rotating plate (27); a compression cylinder (29) is fixedly connected to one side of the mounting plate (28) close to the rotating plate (27); The end of the rotating plate (27) close to the compression cylinder (29) is arranged in an arc shape, and the compression cylinder (29) is arranged in a spiral shape and fits with the inner wall of the extension tube (13).

9. A chip mounter preheating device according to claim 4, characterized in that: It also comprises a mounting collar (12) fixedly connected to the exhaust passage (3), one end of the bellows (1) of the extension pipe (13) being inserted into the mounting collar (12), and the inner diameter of the exhaust passage (3) matches the inner diameter of the extension pipe (13).

10. A preheating method comprising the chip mounter preheating device according to any one of claims 1 to 9, characterized in that: The following steps are also included: Step 1: First, move the wind box (1) to the vicinity of the SMT machine, and insert the air balancing unit and the control unit into the hollow part of the SMT machine, so that the air balancing unit is close to the part of the SMT machine that needs to be preheated; Step 2: The outside air is sucked into the wind box (1) through the preheating unit, and after being heated, it is discharged to the placement machine through the air balancing unit, which will also drive the air balancing unit to rotate, so as to avoid uneven preheating of the placement machine; Step 3: When the SMT machine is working, the dust-proof unit can prevent dust in the air from blowing towards the SMT machine, thereby ensuring the stability of the SMT machine's operation; Step 4: According to the preheating condition of the placement machine, the distance between the control units will be changed, and the size of the resistor connected to the preheating unit will be adjusted to automatically control the preheating condition of the placement machine and adjust the output power of the preheating unit; Step 5: When the air balancing unit rotates, it will intermittently compress the driving unit and transmit the compressed gas of the driving unit to the dustproof unit, driving the dustproof unit to vibrate and avoid blockage of the dustproof unit.

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