JPH11254455A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve unconveniences wherein there exists a problem in which a motor for rotating a brush is heavy in an air cleaner which sucks and removes foreign substances peeled off by means of the brush and it can not be moved in high speed and another problem in which rotating torque is small in a case where the brush is rotated by a suction force. SOLUTION: A brush 11 fitted on a movable shaft 18 is covered with a cover 13 so as to expose at least the apex part of the brush and a rotating driving fan 19 is arranged and the suction hole of a negative pressure source 22 is connected with the inside of the cover 13 through a dust collecting filter 21 and a compressed air exhausted from an exhaust vent of the negative pressure source 22 is provided to the rotating driving fan 19 and a movable shaft 18 is forcibly driven by rotating this rotating driving fan 19 and foreign substances mechanically peeled off by means of the brush 11 is sucked and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for sucking and removing foreign matter, and more particularly to an air cleaner for mechanically rubbing a surface of an object to be cleaned to which the foreign matter has adhered with a brush to remove the removed foreign matter by suction.

[0002]

2. Description of the Related Art In a place where cleanliness is required, foreign matter is prevented from entering from outside, and when foreign matter is generated, the foreign matter is immediately removed. An air cleaner that sucks and removes foreign matter to be removed so as not to diffuse to other undesired portions is generally used as a foreign matter removing device. If the foreign matter is firmly attached to the object to be cleaned, it may not be removed only by the suction force. Therefore, the surface of the object to be cleaned is rubbed with a brush using a brush to remove the foreign matter. And removed by suction. When the object to be cleaned is, for example, a resin molding apparatus for coating a main part of the electronic component intermediate structure with a resin, the resin coating scheduled portion of the electronic component intermediate structure is housed in the cavity of the resin mold, and the mold is closed to close the cavity. Inject the fluidized resin into the resin, and when the filling of the resin is completed, maintain this state for a predetermined time to accelerate the curing of the resin, and when the resin is in a semi-cured state, open the mold and remove the resin molded product. After being taken out of the cavity, the next electronic component intermediate structure is housed in the cavity, and the above operation is repeated. During this operation, a thin flash of resin is formed in a minute gap communicating with the cavity between the mold abutment surfaces, and when the resin molded product is taken out of the cavity, the molding resin is chipped and falls off on the mold abutment surface. If these resin burrs or flakes remain on the mold after removing the resin mold product, it will hinder the subsequent resin molding operation.Therefore, cleaning on the resin mold after removing the resin mold product from the cavity. Work is indispensable. Japanese Utility Model Application Laid-open No. 2
Japanese Patent Application Publication No.-85114 (Prior Art 1) discloses an apparatus including a brush for rubbing the surface of a mold to float a foreign matter attached to the surface of the mold and a suction mechanism for sucking and removing the foreign matter in the floating state. Is disclosed. This device has the feature that it can immediately supply the electronic component intermediate structure onto the mold after the mold cleaner separates from the mold because it can immediately suck and remove the foreign matter peeled off by mechanical rubbing, A suction mechanism with a large suction force was required. To solve this problem, the present applicant has proposed a device shown in FIG. 7 in Japanese Patent Application No. 9-8167 (prior art 2).
In the figure, reference numeral 1 denotes a lower die, in which pots 2 are penetrated at a constant interval on a straight line on the upper surface, and a plurality of pairs of cavities 3 are arranged near each pot 2. An ejector pin for taking out the resin mold product is disposed on the bottom surface of the cavity 3 so as to be able to protrude and retreat, but is not shown.
Reference numeral 4 denotes a plunger inserted into each pot 2, and 5 denotes a resin tablet put into each pot 4. Reference numeral 6 denotes a lead frame () arranged on the cavity 3 of the lower mold 1. Although not shown, the electronic component main body is mounted, and the electronic component main body and the lead portion are electrically connected. The lead frame 6 is supplied to a fixed position on the mold by a loader (not shown), and is taken out of the mold by an unloader (not shown) when the resin molding is completed. Numeral 7 denotes an upper mold opposed to the lower mold 1, and a concave curved cull portion 8 is formed at a position facing the pot 2, and an upper cavity 9 is formed at a position facing the lower cavity 3. . Although not shown, the upper and lower dies 1, 7 are supported by a fixed platen and a movable platen, and are heated. Numeral 10 is arranged on the side of the dies 1 and 7, and is horizontally moved between the opened dies after the resin molding operation is completed, inserted along the arrangement direction of the pots 2, and the resin fragments remaining on the dies surface A mold cleaner for removing foreign matter such as a brush, which brushes the mold surface to float foreign matter attached to the mold surface, and a suction mechanism 12 for sucking and removing the floated foreign matter; I have. That is, the suction mechanism 1
Reference numeral 2 denotes a partition plate 14 disposed in the middle of a cylindrical body 13 which is open vertically, and motors 15, 1 are provided on both upper and lower surfaces of the partition plate 14.
5 is fixed, and the brush 11 is fixed to the rotating shaft of the motor 15. The brush 11 is attached so as to protrude from the opening end of the cylindrical body 13. 16 is a partition plate 1
4 is connected to a negative pressure source (not shown) through a pipe connected to a window 13a opened on the side wall of the cylindrical body 13 so that the side wall of the cylinder 4 is exposed. An unloader (not shown) around the dies 1 and 7 for taking out the electronic component intermediate structure 6 for which the resin molding operation has been completed, in addition to the die cleaner 10, and supplies the electronic component intermediate structure 6 onto the dies. A loader (not shown) is provided. The operation of the resin molding device will be described below. First, the upper and lower molds 1 and 7 are opened, and a lead frame 6 which is an electronic component intermediate structure is supplied onto the mold 1 by a loader. Next, the resin tablet 5 is put into the pot 2, and the upper and lower dies 1, 7 are closed. Then, the plunger 4 is actuated to pressurize and heat the heated resin tablet 5, send it to the cavities 3 and 9, and coat a predetermined portion of the lead frame 1 with the resin. When the resin molding is completed in this manner, the molds 1 and 7 are opened, the resin molded product 6 is taken out of the molds 1 and 7 by the unloader, and the mold cleaner 10 is continuously inserted between the molds 1 and 7. Foreign matter such as resin fragments remaining on the mold is scraped off by the brush 11, and the floating foreign matter is sucked and removed by the suction mechanism 12. When the cleaning on the molds 1 and 7 is completed in this way, the above operation is repeated to perform the resin molding operation on the next lead frame. The mold cleaner 10 includes a brush 11
The surfaces of the molds 1 and 7 are mechanically rubbed to remove foreign matter such as resin burrs that are firmly adhered, and the foreign matter that has come off and floated in the cylinder 13 is immediately sucked by the suction mechanism 12 from the pipe 16. Since the resin is discharged to the outside, good resin molding work can be continued. In the above apparatus, the mold cleaner 10 and the unloader are separately provided.
The lower brush is set to a sufficiently large distance between the lower opening end of the cylinder 13 and the lower mold 1 so that
, The mold cleaner 10 and the unloader can be integrated with each other, so that the removal of the lead frame 6 and the mold cleaning can be performed simultaneously.

[0003]

FIG. 7 shows a brush 11
By mechanically rubbing the surface of the mold by using, the foreign matter firmly attached to the mold, such as a resin flash, can be peeled off, and can be immediately removed by suction by the suction mechanism 12. However, this device requires two motors at the top and bottom, and if a high-torque motor is used to improve the peeling force, the mechanism becomes heavy, and the device becomes large, making it difficult to move at high speed between dies. Become. The applicant discloses in the prior art 2 an embodiment in which the rotating shaft can be driven to rotate by the suction force and the external motor can be eliminated, thereby making the suction mechanism 12 lighter. In addition, there is a problem that the rotational torque of the brush is reduced and the peeling force is reduced.
Further, when a negative pressure source having a large suction force is used to improve the torque of the motor, there is a problem that noise is also increased.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed as a means which can be easily applied to a resin molding apparatus having the above-mentioned problems and can be widely used in addition to the resin molding apparatus. A brush attached to the movable shaft is covered with a cover so that at least the tip is exposed, and a rotary drive fan is arranged at a position outside the cover,
The suction port of the negative pressure source is connected to the inside of the cover via a dust collection filter, and compressed air exhausted from the exhaust port of the negative pressure source is applied to the rotary drive fan. An air cleaner characterized in that a shaft is forcibly driven to suck and remove foreign matter mechanically separated by a brush.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An air cleaner according to the present invention rotates a rotary drive fan by using compressed air of a negative pressure source for sucking foreign matter separated by a brush, and this rotation causes a movable shaft on which a brush of the brush is mounted to rotate. The suction force is reduced by returning the compressed air discharged from the negative pressure source directly into the cover or without releasing the compressed air rotated by the rotary drive fan to the outside. Can be enhanced. This movable shaft may be a rotating shaft, or a swinging shaft that reciprocates in the axial direction. In the case of a rotating shaft, a brush may be fixed to an end surface thereof, or a brush may be fixed to a peripheral surface. Is also good. When the movable shaft is a rotating shaft, the rotating shaft may be directly connected to the rotary drive fan, or the rotation may be transmitted via rotation transmitting means such as gears, pulleys, and rollers. Further, a rotation auxiliary fan that rotates by suction may be fixed to the rotation shaft. The rotation direction of the rotating shaft may be switched by changing the supply direction of the compressed air, or by providing respective rotation driving fans for forward rotation and reverse rotation. If the rotation direction of the rotation shaft can be switched in this way, the optimum rotation direction can be selected according to the movement direction of the rotation shaft that relatively moves along the object to be cleaned. When the movable shaft is a swing shaft, a mechanism such as a link mechanism for converting rotation into reciprocating motion may be arranged between the swing shaft and the rotary drive fan.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawing, components having the same or the same functions as those in FIG. 7 are denoted by the same reference numerals, and redundant description will be omitted. This apparatus is largely different from the apparatus shown in FIG. 7 in that the motor 15 for rotating the brush 11 of the mold cleaner is eliminated and a mechanism for rotating the brush 11 is provided. In the figure, 17 is a double cylindrical ball bearing coaxially fixed in a hole penetrating the partition plate 14, and 18 is a bearing 1
A rotating shaft (movable shaft) inserted and fixed in the inner cylinder of 7,
The brush 11 is fixed to this end. Reference numeral 19 denotes an intermediate position between the bearing 17 and the brush 11, which is a rotary drive fan fixed to the rotary shaft 18. Reference numeral 20 denotes a fan cover which surrounds the rotary drive fan 19 and has an intake port 20a and an exhaust port 20b at both ends. The port 20a and the exhaust port 20b are the brush 1
1 penetrates the opposing wall of a cover (tubular body) 13 that exposes and covers one end. Although only one set of upper and lower brushes 11 is shown in the illustrated example, the brushes 11 are arranged according to the number of pots 2 arranged in the mold 1. Reference numeral 21 denotes a dust filter inserted in the middle of the pipe 16 connected to the window 13a on the side wall of the cover 13, and reference numeral 22 denotes a negative pressure source connected in front of the dust filter 21 of the pipe 16; Also functions as a compressor that discharges air. Reference numeral 23 denotes a second pipe connecting the exhaust port of the negative pressure source 22 and the intake port 20a of the fan cover 20. If necessary, a large space may be formed in the middle to provide a pressure accumulating chamber to further increase the pressure. . The operation of this device will be described below. Since this mold cleaner performs the same operation between the molds 1 and 7 as the conventional apparatus, the description thereof will be omitted, and the rotation drive of the brush 11 will be described. When the mold cleaner is inserted between the molds 1 and 7, the negative pressure source 22 is operated. As a result, outside air is sucked from the upper and lower opening ends of the cover 13, and the sucked outside air is further absorbed by the cover 13.
Is sucked into the negative pressure source 22 through the pipe 16 and the dust collecting filter 21 from the window 13a. Therefore, foreign matter floating in the cover 13 is caught by the filter 21, and clean air is compressed from the output port of the negative pressure source 22 and sent to the intake port 20 a of the fan cover 20 via the pipe 23. The compressed air pushes the rotary drive fan 19 fixed to the rotary shaft 18 in the fan cover 20 to rotate the rotary shaft 18 and is discharged from the exhaust port 20b. As a result, the rotating shaft 18 rotates, and the brush 11 fixed to the end of the rotating shaft 18 rotates.
Foreign matter firmly adhered to the surface of No. 7 is rubbed off. Since external air is continuously fed into the cover 13, the separated foreign matter is immediately discharged from the cover 13.
In this device, a motor having a large weight can be eliminated, so that the weight of the mold cleaner can be reduced, and the movement of the mold cleaner can be accelerated. On the other hand, since the rotating shaft 18 is rotated by the compressed air, a remarkably large torque can be obtained as compared with the case where the rotating shaft 18 is rotated by the suction force. The negative pressure source 22
Compressed air released from the loudspeaker generates noise and requires strict sound insulation treatment. However, in this device, the compressed air released from the negative pressure source 22 is sent into the fan cover 20 by a pipe 23, and the fan cover 20 Is further surrounded by the cover 13, so that the noise amount can be suppressed.
FIG. 3 shows a deformation of the mold cleaner of FIG. In the figure, the same reference numerals are given to those having the same or the same functions as those in FIG. 7 and FIG. 1, and duplicate description is omitted. In this embodiment, an outer cover 24 that is slightly longer than the length of the cover 13 is arranged on the outer periphery of the cover (cylindrical body) 13 with a gap, and the exhaust port 20 b of the fan cover 20 is opened in the space between the covers 13 and 24. . In this device, the compressed air supplied into the fan cover 20 by the pipe 23 and rotating the brush 11 fills the space between the covers 13 and 24 and is discharged to the outside from both ends of the opening, but the inside of the cover 13 is in a negative pressure state. , Cover 1
3. Since the gap at both ends is set larger than the gap at both ends of the outer cover 24, most of the compressed air is
And the air pressure in the cover 13 is increased. For this reason, the load on the negative pressure source 22 is reduced, the suction force at the dust collection filter 21 is increased, and foreign matter in the cover 13 can be reliably removed. FIGS. 4 and 5 show an air cleaner according to another embodiment of the present invention. In the drawings, the same components as those in FIGS. 7 and 1 or those having the same functions are denoted by the same reference numerals, and redundant description will be omitted. . In the drawing, reference numerals 25 and 25 denote rotating shafts (movable shafts) which are arranged in a cover (cylindrical body) 13 whose upper surface is closed and parallel to the lower opening end, and whose both ends are pivotally supported. Has been planted. Reference numeral 26 denotes one end of the rotary shaft 25, which is rotatably driven by a support shaft 27 planted on the outer wall of the cover 13 and freely rotates. Reference numeral 28 denotes a drive fan cover for surrounding and bending the rotary drive fan 26. 28a and an exhaust port 28b. 29 is a first belt guide concentrically connected to the rotary drive fan 26 from outside the drive fan cover 28, 30 is a second belt guide fixed to the rotary shaft 25 protruding outside the cover 13, 31 is the first belt guide , A belt for transmitting rotation between the second belt guides 29 and 30. The first and second belt guides 29 and 30 and the belt 31 constitute a rotation transmission mechanism. However, gears and rollers may be used as long as the rotation can be transmitted efficiently. Reference numeral 32 denotes a rotation auxiliary fan fixed to the other end of the rotating shaft 25 protruding outside the cover 13, and an auxiliary fan cover 33 having an intake port 33a and an exhaust port 33b is bent. In this device, the pipe 16 extends inside from the side wall of the cover 13 and opens between the brushes 11 arranged in parallel. The pipe 16 is connected to a negative pressure source 22 via a dust filter 21, and the compressed air discharged from the negative pressure source 22 is connected to an intake port 28 a of a driving fan cover 28 through a second pipe 23. The exhaust port 33 b of the auxiliary fan cover 33 communicates with a part of the pipe 16. This air cleaner is a brush 1 arranged in parallel.
It is set to rotate in opposite directions to collect foreign matter in the middle between 1 and 11. Although this air cleaner closed the upper end of the cover 13 and opened only the lower surface,
Upper and lower ends of the cover 13 may be opened, and a pair of brushes shown in the figure may be disposed above the pair to enable cleaning from both upper and lower surfaces. The operation of this device will be described below. First, when the negative pressure source 22 is operated, outside air is sucked from the opening end of the cover 13, and the sucked outside air is further sucked into the negative pressure source 22 through the pipe 16 and the dust filter 21. As a result, foreign matters floating in the cover 13 are caught by the filter 21, and clean air is compressed from the output port of the negative pressure source 22 and passes through the pipe 23 to drive the fan cover 28.
To the suction port 28a. This compressed air rotates the rotary drive fan 26 in the drive fan cover 28 and is discharged from the exhaust port 20b. As a result, the rotation of the first belt guide 29 is transmitted to the second belt guide 30 by the belt 31, the rotation shaft 25 rotates, and the brush 11 rotates. In this apparatus, since the rotating directions of the brushes 11 and 11 are set so that the separated foreign matters are collected between the brushes, the floating foreign matters are surely sucked and removed by the pipe 16. In this device, a rotation assist fan 32 is fixed to the other end of the rotating shaft 25 and rotates by suction. When the rotation direction is the same as the rotation direction of the rotation driving fan 26, the rotation is strengthened and the suction force is improved. Can be. Furthermore, the compressed air that has caused the rotary drive fan 26 to rotate is guided into the inside of the cover 13 from the open end thereof,
By increasing the internal pressure, the suction force can be further improved. This device has the same effect as the device shown in FIG. 1, and can further increase the contact area of the brush 11 with the object to be cleaned. In addition, this device can set the rotation torque and the number of rotations of the brush 11 in a wide range by appropriately setting the diameter of the belt guides 29 and 30 to the rotation transmission ratio of the rotation transmission mechanism. The present invention is not limited to the above embodiment. For example, the movable shaft to which the brush is fixed may be not only a rotary shaft but also a swing shaft that reciprocates in a horizontal direction. In this case, the brush is swung. Fix the moving shaft in one radial direction, guide it in the horizontal direction, pull one end side outward with a spring, plant a pin on a part of the swing shaft, and rotate this pin against the eccentric cam Then, the rotation of the rotary drive fan may be transmitted to the eccentric cam to swing the swing shaft. As the swing mechanism, a link mechanism or the like can be used in addition to the eccentric cam. Further, in the embodiment of FIG. 4, the rotation of the pair of brushes 11 is fixed, but when only one brush is used, the rotation direction around the axis may be set corresponding to the relative movement direction of the brush. Good. Specifically, as shown in FIG. 6, when the object is moved and rotated in the direction of the solid line shown in the case of moving in the direction of the solid line shown in the drawing, and in the case of the opposite direction, it is moved and rotated in the direction of the dotted line shown in the drawing. Can be reliably rubbed by the brush 11, so that the cleaning operation can be reliably performed. Further, it goes without saying that the present invention can be applied not only to a mold cleaner of a resin molding apparatus but also to an air cleaner in general.

[0007]

As described above, according to the present invention, a heavy motor is not required to rotate the brush, and the apparatus can be reduced in size and weight, and the rotating torque and the number of rotations of the brush can be increased to efficiently remove foreign matter. An air cleaner that can be removed can be realized.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of a main part of the apparatus in FIG. 1;

FIG. 3 is a partial sectional side view showing a modification of the apparatus in FIG. 1;

FIG. 4 is a plan sectional view showing another embodiment of the present invention.

FIG. 5 is a side view of the apparatus of FIG. 4;

FIG. 6 is a side sectional view showing an example of setting a moving direction and a rotating direction of a brush of the device of the present invention.

FIG. 7 is a side sectional view of an air cleaner which is a premise of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Brush 13 Cover 18 Movable shaft (rotating shaft) 19 Rotation drive fan 22 Negative pressure source 21 Dust collection filter

Claims (9)

[Claims] 1. A brush attached to a movable shaft is covered with a cover so that at least a tip portion of the brush is exposed, and a rotary drive fan is arranged. An intake port of a negative pressure source is connected to the inside of the cover via a dust collection filter. Applying compressed air exhausted from an exhaust port of a negative pressure source to the rotary drive fan, forcibly driving the movable shaft by rotation of the rotary drive fan,
An air cleaner characterized in that foreign matter mechanically separated by a brush is removed by suction. 2. The air cleaner according to claim 1, wherein the compressed air discharged from the negative pressure source is returned to the inside of the cover. 3. The air cleaner according to claim 1, wherein the movable shaft is a rotating shaft. 4. The air cleaner according to claim 3, wherein the rotary shaft and the rotary drive fan are directly connected. 5. The air cleaner according to claim 3, wherein a rotation transmission mechanism is arranged between the rotation shaft and the rotation drive fan. 6. The air cleaner according to claim 3, wherein a rotation auxiliary fan that rotates by suction is fixed to the rotation shaft so as to give a rotation in the same direction as the rotation direction of the rotation shaft by the rotation driving fan. . 7. The air cleaner according to claim 3, wherein the rotation shaft is rotatable forward and backward. 8. The air cleaner according to claim 7, wherein the rotation direction of the rotation shaft is set in accordance with the movement direction of the rotation shaft relatively moving along the object to be cleaned. 9. The system according to claim 1, wherein the movable shaft is a swing shaft that reciprocates in the axial direction, and a mechanism that converts rotation into reciprocating motion is disposed between the swing shaft and the rotary drive fan. 2. The air cleaner according to 1.