KR100515969B1 - Solenoid valve and vacuum supplying curcuit using it - Google Patents

Abstract

According to the present invention, according to the present invention, there is provided a vacuum chamber having a predetermined volume of internal space, wherein a vacuum is supplied at a first position and a vacuum is released at a second position, a first position and a second position. A second port connected to the vacuum chamber at, a main vacuum supplied by being connected to the first port at a first position, and a vacuum supplied from the vacuum chamber by being connected to the vacuum chamber via the second port at a second position A vacuum supply solenoid valve having a third port supplied with the second port and a fourth port connected to the vacuum chamber at a first position to provide a sub vacuum to the vacuum chamber and to be closed at the second position; Provided is a hydraulic circuit for vacuum supply comprising a; vacuum operation unit for applying a vacuum provided therefrom by being connected to the third port of the solenoid valve.

Description

Solenoid valve and vacuum supplying curcuit using it

The present invention relates to a solenoid valve and a hydraulic circuit for vacuum supply using the same, and more particularly, a solenoid valve and a hydraulic pressure for vacuum supply using the same, which can be applied to a component adsorption and mounting hydraulic circuit used in a component mounter or a die bonding apparatus. It is about a circuit.

In general, in equipment such as a component mounter or a die bonding apparatus, an electronic component is sucked by a component adsorption nozzle using a vacuum, and the operation of moving the absorbed electronic component to a predetermined position such as a circuit board is repeated. Speed and accuracy are important factors in the adsorption and mounting of these parts. For example, the rate at which the adsorption nozzles raise and descend by adsorbing the part is also related to the rate at which the vacuum is formed and the rate at which it is released. This is because the faster the formation and release of the vacuum for adsorbing the part is made, the shorter the time for descending to adsorb the part and the time for rising again after the part is mounted. In addition, if a more powerful vacuum pump is used to form the vacuum faster, longer time will be required to release the vacuum thus formed, and additional means will be needed to shorten the time.

Typically, the ascending and descending speeds of the nozzles are implemented as 7G (G is 9.8 m / s ² as the gravitational acceleration), to ensure the time required to build and release vacuum at the adsorption nozzle end while the nozzle is raised and lowered. It was. Raising and lowering the nozzle earlier than this can double the working speed, but in practice it is no longer possible to shorten the raising and lowering speed of the nozzle because the time required for the formation and release of the vacuum can no longer be shortened.

1 schematically shows a configuration of a hydraulic circuit for vacuum supply according to the prior art.

Referring to the drawings, the main vacuum supply pipe 14 and the sub vacuum supply pipe 18 branch from the air supply source 1. The main vacuum supply pipe 14 is composed of a component suction nozzle 15 from the first solenoid valve 11 through the vacuum generator 3 and the second solenoid valve 12. The main vacuum supply pipe 14 has a function of providing or releasing the vacuum to the nozzle 15 for component adsorption according to the positions of the first solenoid valve 11 and the second solenoid valve 12. The sub vacuum supply pipe 18 is composed of the speed control unit 17 and the second solenoid valve 12 from the sub vacuum generator 19, and is connected to the nozzle 15 according to the position of the second solenoid valve 12. It has the function of providing or releasing the vacuum. In the sub-vacuum generator 19, a vacuum of a lower degree of vacuum than the main vacuum generator 3 is formed.

As shown in the figure, the first and second solenoid valves 11 and 12 are four port two position valves. In the first position of the first solenoid valve 11, the vacuum generator 3 is not connected to the air source 1, while in the second position the vacuum generator 3 is connected to the air source 1. Meanwhile, in the first position of the second solenoid valve 12, the main vacuum supply pipe 14 is connected to the nozzle 15, while in the second position, the main vacuum supply pipe 14 is connected to the sub vacuum generator ( 19, the secondary vacuum supply pipe 18 is connected to the nozzle (15).

Briefly explaining the operation of the hydraulic circuit shown in Figure 1 as follows. First, the standby state in which the adsorption and mounting of the parts is not performed corresponds to the state in which the first and second solenoid valves 11 and 12 are in the first position, in which case the main vacuum is not provided to the nozzle 15. The vacuum generated by the sub vacuum generator 19 is fed back. Next, upon adsorption of the part, the first solenoid valve 1 is in the second position such that a main vacuum is provided to the nozzle 15 to adsorb the part, and the second solenoid valve 12 is still in the second position. It will be in position 1. In mounting the part, the second solenoid valve 12 is switched to the second position, whereby the main vacuum is released while providing the sub vacuum generated in the sub vacuum generator 19 to the nozzle 15. As described above, since the vacuum generated in the sub-vacuum generator 19 is lower than the vacuum generated in the main vacuum generator 3, the main vacuum applied to adsorbing the component in the nozzle 15 can be rapidly released. .

Despite the advantage that the hydraulic circuit for vacuum supply as described above can shorten the time required to form and release the vacuum, there is a disadvantage that the hydraulic circuit itself is complicated, such as the use of two solenoid valves. There is also a limit to shorten the time of vacuum formation and release, since it takes time to operate the two solenoid valves.

The present invention has been made to solve the above problems, an object of the present invention is to provide a solenoid valve that can be quickly formed and released the vacuum in the hydraulic circuit for vacuum supply.

It is another object of the present invention to provide a hydraulic circuit for vacuum supply, in which the formation and release of a vacuum can be made quickly.

In order to achieve the above object, according to the present invention, there is provided a vacuum chamber having a predetermined volume of internal space, wherein a vacuum is supplied at a first position and a vacuum is released at a second position, a first position and a first position. A second port connected to the vacuum chamber at a second position, a main vacuum being supplied by being connected to the first port at a first position, and supplied from the vacuum chamber by being connected to the vacuum chamber through the second port at a second position A vacuum supply solenoid valve having a third port supplied with a vacuum and a fourth port connected to the vacuum chamber at a first position to provide a sub vacuum to the vacuum chamber and to be closed at the second position; Provided is a hydraulic circuit for vacuum supply comprising a; vacuum operation unit for applying a vacuum provided therefrom by being connected to the third port of the solenoid valve.

According to one feature of the invention, the volume of the vacuum chamber is 1.2 to 1.3 times the volume from the second port to the vacuum actuating portion.

According to another feature of the invention, the pressure of the vacuum actuator is 0 to 30 PSI by the vacuum supplied from the vacuum chamber at the time of vacuum release of the vacuum actuator.

According to the present invention, there is also provided a vacuum chamber having a predetermined volume of internal space, wherein the vacuum chamber is supplied at a first position and the vacuum is released at a second position, the first and second positions of the vacuum chamber. A second port connected to the first port, wherein the main vacuum is supplied by being connected to the first port at a first position, and the second vacuum port is connected to the vacuum chamber through the second port at a second position to receive a vacuum supplied from the vacuum chamber. A vacuum supply solenoid valve having a three port and a fourth port connected to the vacuum chamber at a first position to provide a sub vacuum to the vacuum chamber and to be closed at the second position; And a component adsorption nozzle for applying a vacuum provided therefrom by being connected to the third port of the solenoid valve.

Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. Although the hydraulic circuit shown in the drawings is a hydraulic circuit used in a component mounter for absorbing components and mounting them on a substrate, those skilled in the art will understand that such a hydraulic circuit may be applied to other things. .

2 shows a schematic configuration diagram of a hydraulic circuit for vacuum supply according to the present invention.

Referring to the drawings, the vacuum supply hydraulic circuit includes a vacuum supply manifold 21 having a main vacuum supply port 23 and a sub vacuum supply port 25; A solenoid valve (28) connected from the main vacuum supply part (23) of the vacuum supply manifold (21) through a main vacuum supply pipe (26); A component suction nozzle 31 connected through the vacuum supply pipe 32; and the sub vacuum supply port 25 of the vacuum supply manifold 21 has the solenoid valve 28 and the sub vacuum. It is connected via the supply pipe (27). The solenoid valve 28 is provided with a vacuum chamber 29, the vacuum chamber 29 may be provided with a vacuum through the secondary vacuum supply pipe 27. The degree of vacuum of the vacuum supplied through the main vacuum supply pipe 26 is higher than the vacuum degree of the vacuum supplied through the sub vacuum supply pipe 27, or a vacuum degree lower than atmospheric pressure is provided. In practice, since the vacuum through the main vacuum supply pipe 26 affects the sub vacuum supply pipe 27, the degree of vacuum in the sub vacuum supply pipe 27 tends to increase. Therefore, in order to maintain the pressure of the sub-vacuum supply pipe 27 at a low degree of vacuum or atmospheric pressure, air having a predetermined pressure must be blown.

The main vacuum pump connector 22 and the blower pump connector 24 are formed in the vacuum supply manifold 21. The vacuum provided through the main vacuum pump connector 22 is provided to the main vacuum supply pipe 26 through the main vacuum supply port 23. On the other hand, the vacuum provided through the blow pump connection 24 is connected to the sub vacuum supply pipe 27 through the sub vacuum supply port 25.

3 shows a schematic diagram of a solenoid valve according to the present invention.

Referring to the figure, solenoid valve 28 is a four port two position valve. In the first position indicated by reference numeral 41, the first port A is connected to the third port C and the second port B is connected to the fourth port D. FIG. On the other hand, in the second position indicated by reference numeral 42, the first port A 'is closed, and the second port B' is connected to the third port C '.

The first port A or A 'is connected to the main vacuum supply pipe 26 shown in FIG. 2, and the second port B or B' is connected to the vacuum chamber 29. The third port C or C 'is connected to the nozzle 31 for component adsorption. The fourth port D or D 'is connected to the secondary vacuum supply pipe 27 in FIG.

The vacuum chamber 29 is installed at one side of the solenoid valve 28, and is supplied with vacuum through the sub vacuum supply pipe 27 (FIG. 2) according to the position of the solenoid valve 28 (first position 41). ) Or (second position 42) to provide a vacuum to the nozzle 31 for component adsorption. The vacuum chamber 29 may be used by installing a member having an internal space of a predetermined volume on one side of the solenoid valve 28 to connect the flow path so as to be open and close. The vacuum chamber 29 is provided with a vacuum of a predetermined pressure. In practice, a vacuum with a low degree of vacuum, such as atmospheric pressure, is provided and is supplied with air by a blower pump as described above. The vacuum thus provided serves to rapidly release the high vacuum state of the nozzle when the component is mounted. For example, the pressure of the air formed at the end of the nozzle by the vacuum supplied from the vacuum chamber at the time of component mounting is about 0 to 30 PSI (about 0.2 MPa), and at the same time the vacuum is released rapidly, The adsorbed component can be mounted at the end of the nozzle without being blown away. Denoted at 30 is a vacuum sensor, and measures the degree of vacuum formed in the vacuum pipe 32.

Hereinafter, the operation of the vacuum supply hydraulic circuit according to the present invention will be briefly described.

2, the main vacuum pump connector 22 is connected to the main vacuum supply pipe 26 through the vacuum supply manifold 21, and the blower pump connector 24 is connected to the sub vacuum supply pipe. Connected to (27). As mentioned above, the vacuum supplied through the main vacuum supply pipe 26 has a higher degree of vacuum than the vacuum supplied through the sub vacuum supply pipe 27.

The process of adsorbing the component by the adsorption nozzle 31 may be divided into an initialization stage, a component adsorption stage, and a component mounting stage. In the component adsorption step, the main vacuum is provided to the component adsorption nozzle 31 to adsorb the components. In the component mounting step, the main vacuum is released and at the same time, the vacuum degree 29 is lowered from the vacuum chamber 29 to the component adsorption nozzle 31. Alternatively, atmospheric pressure is provided to allow the component to be mounted quickly.

In the initialization phase the solenoid valve 28 is in the second position 42. In this position, the vacuum provided through the main vacuum supply pipe 26 is in a released state, so that the first port A 'connected to the main vacuum supply pipe 26 is closed. The vacuum chamber 29 is opened through the nozzle 31.

In the component adsorption step, the solenoid valve 28 is switched to the first position. In the component adsorption step, a vacuum is provided through the main vacuum supply pipe 26. At this time, the vacuum provided through the main vacuum supply pipe 26 is supplied to the component adsorption nozzle 31 through the first port A and the third port C connected thereto to adsorb the component. At the same time, the sub vacuum supplied through the sub vacuum supply pipe 27 is provided to the vacuum chamber 29 through the fourth port D and the second port B connected thereto. The vacuum chamber 29 has a vacuum pressure formed by the sub-vacuum, which has a lower vacuum degree than the vacuum pressure formed by the main vacuum, and in practice, blows air using a blower pump to maintain the atmospheric pressure. do.

Upon conversion to the component mounting phase the main vacuum is released and the solenoid valve 28 is switched back to the second position 42. That is, the vacuum chamber 29 and the nozzle 31 are connected. At this time, a vacuum having a lower degree of vacuum than the main vacuum acts on the vacuum chamber 29 in the component adsorption nozzle 31 provided with the main vacuum. That is, the predetermined air is blown through the sub-vacuum pipe 27 in the component adsorption step, so that the vacuum from the vacuum chamber 29 maintaining the low vacuum degree is supplied to the component adsorption nozzle 31. In this case, since the vacuum degree of the vacuum chamber 29 is lower than the vacuum degree of the main vacuum, a vacuum can be eliminated rapidly and thereby a component can be quickly mounted in a predetermined position.

The volume of the vacuum chamber 29 is preferably determined in consideration of the volume of the pipe from the end of the suction nozzle provided in the nozzle 31 to the second port B or B 'connected to the vacuum chamber 29. For example, the volume of the vacuum chamber 29 is preferably 1.2 to 1.3 times the volume of the pipe from the suction nozzle end to the second port B or B '. This volume is such that the pressure at the adsorption nozzle end is maintained at about 0 to 30 PSI (about 0.2 MPa) when mounting the parts as described above. In this case, since the air in the vacuum chamber 29 can fill the space to the end of the adsorption nozzle rapidly, rapid component mounting can be achieved.

The solenoid valve and the hydraulic circuit for vacuum supply using the same according to the present invention have the advantage that the supply and release of the vacuum is made quickly. When the hydraulic circuit for vacuum supply according to the present invention is applied to a component mounter, the component adsorption nozzle can be raised and lowered at a speed of up to 9G, thereby accelerating component mounting. In addition, in the prior art, there is an advantage that the phenomenon that the component is blown or the mounting position of the component is displaced by another vacuum supplied at the time of vacuum release can be prevented.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it is merely exemplary, and those skilled in the art may realize that various modifications and equivalent other embodiments are possible. I can understand. Therefore, the true scope of protection of the present invention should be defined by the appended claims.

1 is a schematic configuration diagram of a conventional hydraulic circuit for vacuum supply.

2 is a schematic configuration diagram of a hydraulic circuit for vacuum supply according to the present invention.

3 is a schematic diagram of a solenoid valve according to the present invention;

<Brief Description of Major Codes in Drawings>

1.air source 11.first solenoid valve

12. Second solenoid valve 13. Vacuum sensor

15. Nozzle for adsorption of parts 19. Vacuum generator

21. Vacuum supply manifold 22. Main vacuum pump end connection

23. Main vacuum supply port 24. Second vacuum pump connection

26. Main vacuum supply piping 28. Solenoid valve

29. Clearing chamber 30. Vacuum sensor

Claims (4)

A vacuum chamber in which a predetermined volume of internal space is formed, A first port through which vacuum is supplied in a first position and vacuum is released in a second position, A second port connected to the vacuum chamber in a first position and a second position, A third port supplied with a vacuum supplied from the vacuum chamber by being connected to the first port at a first position to supply a main vacuum, and connected to the vacuum chamber through the second port at a second position; A vacuum supply solenoid valve connected to the vacuum chamber at a first position to provide a sub-vacuum to the vacuum chamber and having a fourth port closed at the second position; And a vacuum operation unit connected to the third port of the solenoid valve to apply a vacuum provided therefrom. 2. The hydraulic pressure circuit for vacuum supply according to claim 1, wherein the volume of the vacuum chamber is 1.2 to 1.3 times the volume from the second port to the vacuum operation portion. 2. The hydraulic pressure circuit for vacuum supply according to claim 1, wherein the pressure of the vacuum operation portion is 0 to 30 PSI by the vacuum supplied from the vacuum chamber when the vacuum operation portion is released. A vacuum chamber in which a predetermined volume of internal space is formed, A first port through which vacuum is supplied in a first position and vacuum is released in a second position, A second port connected to the vacuum chamber in a first position and a second position, A third port supplied with a vacuum supplied from the vacuum chamber by being connected to the first port at a first position to supply a main vacuum, and connected to the vacuum chamber through the second port at a second position; A vacuum supply solenoid valve connected to the vacuum chamber at a first position to provide a sub-vacuum to the vacuum chamber and having a fourth port closed at the second position; And a component adsorption nozzle for applying a vacuum provided therefrom by being connected to the third port of the solenoid valve.