JPH0424560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum control device, and is characterized in that it is suitable for sucking a workpiece with a suction pad and moving or fixing the workpiece. When moving or fixing a workpiece using a suction pad as described above, it is desirable to confirm complete suction and to release suction quickly and reliably. In other words, if you move the suction pad to the next step with incomplete suction, the workpiece may fall during the process, which is dangerous. If it is not released, there is a disadvantage that work efficiency will deteriorate.

Conventionally, in view of the above, a "vacuum suction fishing device" as disclosed in Japanese Utility Model Publication No. 47-25413 has been provided, but since these devices connect each part of the device with a large number of connecting pipes, they have a compact structure. It was difficult to do so, and problems remained in terms of vacuum (adsorption) confirmation.

The present invention solves the above-mentioned problems.The vacuum source main body, the vacuum break valve, and the vacuum confirmation switch are integrally constructed, the response is quick, and it is extremely compact. The aim is to provide a safe product that can be removed from adsorption according to the size and nature of the workpiece. In addition, the present invention does not use conventionally available reciprocating or vane type vacuum pumps as a vacuum source, but uses a simple and inexpensive ejector that uses compressed air from a compressor that is always available in any factory. The present invention is characterized in that a pump is used, the compressed air is used in the same way when the adsorption is released, and furthermore, the compressed air is saved, thereby achieving an economical and ideal adsorption release.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Vacuum source main body a having a switching control section for supplying compressed air to an ejector pump or a vacuum breaker valve, an ejector pump and a suction pad connection section
As shown in FIGS. 6 to 11, it is composed of a main body 1 and clamping plates 3 and 4 which are detachably attached to both ends of the main body 1 with screws 2 and 2a.

First, inside the main body 1, there is a compressed air supply passage 5 in the horizontal direction, a horizontal hole 8 into which the sleeves 6a, 6b, and 6c and the spool 7 are fitted, a passage 9 provided in the horizontal direction, and a nozzle body 10 that serves as an ejector pump. and a lateral hole 12 into which the conical hole body 11 is fitted, a communication hole 13 that communicates the supply passage 5 and the lateral hole 8, a communication hole 14 that communicates the lateral hole 8 and the passage 9, and a communication hole 14 that communicates the passage 9 with the nozzle body 10. Communication hole 16, nozzle body 10
A suction pad connecting portion 18 for connecting an intake hose, a suction pad, etc. (not shown) is provided to the compartment X formed between the conical hole 11 and the conical hole 11.

According to the present invention, the supply passage 5, the horizontal hole 8, the passage 9, and the horizontal hole 12 of the main body 1 can be easily constructed by drilling holes from the mounting surface side of the clamping plates 3, 4, and the communication hole 14, Reference numeral 16 is constructed by drilling a vertical hole from the upper and lower surfaces in FIG. 6, and is constructed by attaching stoppers 19 and 20.

Further, the tightening plate 3 has a through hole 23 that matches the compressed air supply passage 5, and sleeves 6a, 6b.
and 6c, and a through hole 24 that fits with the side hole 8 into which the spool 7 is fitted, and a three-way switching valve 25 and a solenoid 26 for driving the same are provided on the outer surface of the through hole 24. In the figure, 27 is a compressed air supply port.

Further, the tightening plate 4 is provided with a through hole 28 communicating from the compressed air supply passage 5 to the horizontal hole 8, a recessed hole 30 for receiving a spring 29 provided at one end of the spool 7, and a compressed air exhaust port 31. Exhaust port 31
A muffler 32 is attached to the section.

In the figure, 33 and 34 are sleeve holding rings, and 35
36 is an O-ring, 36 is a seal ring, 37 is a seal packing, 39 is a piston formed on the spool 7, and 40 is a mounting hole.

Next, referring to the sleeves 6a, 6b, 6c and spool 7 of the present invention, the sleeves may be integrated, but the sleeves 6a and 6c, which are divided into three as shown in FIG. and 42 are provided. Further, a communication hole 43 is provided in the sleeve 6b.

The spool 7 is located inside the sleeves 6a, 6b, and 6c, and has a large diameter portion 7a approximately in the center, and one side of the large diameter portion 7a is configured to seal one of the inner ends of the sleeve 6a or 6c, respectively. There is.

To explain an example of the vacuum effect of the vacuum source main body a, in the case shown in FIG. is held still to the left by a spring 29, and when compressed air is supplied to the supply port 27, the compressed air flows through the supply passage 5, the communication hole 13,
The communication hole 43 of the sleeve 6b, going around the sleeve 7, the communication hole 42 of the sleeve 6c, the communication hole 1
4, through the passage 9 and the communication hole 16, it is injected from the nozzle body 10 toward the conical hole body 11, and the inside of the compartment X becomes negative pressure, and the suction pad connection part 18, and furthermore, although not shown, the suction hose and The air in the suction pad is suctioned and exhausted, and the workpiece is attracted to the suction pad, allowing the workpiece to be moved or fixed. In addition, in the figure, 44 is a communication hole communicating with the passage 9 and a communication groove 65 of a vacuum breaker b, which will be described later.
5 is a communication hole communicating from the position of the sleeve 6a of the side hole 8 to a communication groove 68 of a vacuum breaker valve b, which will also be described later, and 46 is a communication groove 6 of the vacuum breaker valve b, which will be described later.
A communicating hole 9 communicates with the compartment X, and a communicating hole 47 communicates with a vacuum switch c, which will be described later.

Next, referring to the vacuum break valve b, the vacuum break valve b is integrated with the vacuum source main body a, and is constructed as shown in FIGS. 12 to 16.

The vacuum break valve b is connected to a communication groove 68 through which compressed air is introduced from the vacuum source main body a when the supply of compressed air to the ejector pump is stopped by the switching control section of the vacuum source main body a, and a communication groove 68 through which compressed air is introduced from the vacuum source main body a. A communication groove 69 is provided for supplying air to the suction pad connecting portion 18, and is further moved by the introduction of the compressed air to connect both the communication grooves 68, 6.
When compressed air starts to be supplied to the pistons 55, 56, the displacement adjustment section Z provided in the compartment Y on the opposite side of the pistons 55, 56, and the ejector pump, compressed air is supplied to the piston 5.
Compressed air communication groove 6 for returning 5, 56 to its original state
5.

That is, a horizontal hole 51 is bored in the main body 50, a partition wall 53 having a through hole 52 is fixed to one side of the side hole 51, a rod 54 is loosely inserted into the through hole 52, and a piston is attached to both ends, that is, the inner end. 5
5. A hole 56 having a smaller diameter than the inner diameter of the side hole 51 is provided at the outer end, and one end of the side hole 51 is sealed with a plug 57. Further, compressed air is supplied to the other side of the side hole 51, that is, the compartment Y on the opposite side of the piston 55, when compressed air supply to the displacement adjustment part Z and the ejector pump is started, and the pistons 55 and 56 are returned to their original states. A compressed air communication groove 65 is provided. Specifically, a sleeve 58 and a partition wall 60 having a through hole 59 are provided, and a hollow spool 62 is provided between the sleeve 58 and the partition wall 60, is inserted through the sleeve 58, and has a knob at the outer end. An adjustment rod 6 is provided and screwed to the main body 50 side.
1 is fitted into the hollow portion of the spool 62, and a spring 63 is interposed between the spool 62 and the partition wall 60. Furthermore, the spool 62 is connected to the adjustment rod 61, which communicates between the inside and outside of the spool 62. A communication hole 64 is provided whose opening degree is adjusted by advancing and returning.

In the figure, 65 is the switching passage 9 of the vacuum source body a described above.
This is a compressed air communication groove that communicates with the communication hole 44 of the sleeve 58 and returns the pistons 55 and 56 to their original states when compressed air is supplied to the ejector pump at the start of compressed air supply to the ejector pump. The communication hole 57 provided in the annular groove 66 and the communication hole 6 of the hollow spool 62 communicate with the annular groove 66 .
4 into the interior of the spool 62.

In addition, 68 in the figure is the side hole 8 of the vacuum source main body 9 described above.
This is a communication groove that communicates with the communication hole 45 provided at the position of the sleeve 6a, and is opened between the pistons 55 and 56 of the horizontal hole 51.

In addition, 69 in the figure is the partition wall 53 part of the side hole 51,
A horizontal hole 46 communicating with the compartment X of the vacuum source main body a described above.
An annular groove 70 provided at an appropriate position on the outer periphery of the partition wall 53 and the rod 5 inside the annular groove 70.
4 are communicated with each other through a communication hole 71.

Next, we will discuss the case of releasing the adsorption of the workpiece adsorbed by the suction pad. First, during the operation of the vacuum source main body a, that is, when compressed air is supplied to the ejector pump, a part of the compressed air is released from the passage 9. Communication hole 44, communication groove 6 of vacuum break valve b
5. Annular groove 66 of sleeve 58, communication hole 67, communication hole 64 of spool 62, through hole 59 of partition wall 60
pressing the piston 55 through the piston 55;
The rod 54 and piston 56 are positioned as shown in FIG.

In this state, among the other communication holes leading to the vacuum breaker valve b, the communication hole 45 is closed on the sleeve 6a side, so compressed air is not supplied to it, and the communication hole 46 is in the opposite state, that is, a negative pressure state. ing.

Next, when the solenoid 26 of the vacuum source main body a is energized, the three-way switching valve 25 is switched, and the compressed air passes through the supply port 27, the supply passage 5, the through hole 23, and the through hole 24, and the back of the piston 39 of the spool 7. is supplied to the sleeve 6, and the spool 7 is moved rightward in FIG.
It separates from the inner end of the sleeve 6c and seals with the inner end of the sleeve 6c, cutting off the supply of compressed air to the communication hole 44 through which the vacuum breaker valve b communicates.

As a result, the compressed air goes around the supply port 27, the supply passage 5, the communication hole 13, the communication hole 43 of the sleeve 6b, and the spool 7, and then goes around the communication hole 41 of the sleeve 6a, the communication hole 45, and the communication groove 68 of the rupture valve b. The piston 55 in the side hole 51 and the piston 5
6, the communication hole 71 of the partition wall 53, the annular groove 70, the communication groove 69, and the communication hole 4 of the vacuum source main body a.
6. The suction pad is supplied from the compartment X and the suction pad connecting portion 18 to the suction pad section (not shown), and the suction is actively released. At the same time, since there is a gap between the piston 56 and the horizontal hole 51, and due to the adjustment of the displacement adjustment part Z, the piston 55 is gradually moved to the right in the state shown in Figure 12, and the rod 54 and piston 56 are also moved in the same way. Eventually, the space between the piston 56 and the partition wall 53 is sealed.

As a result, the communication groove 68 and the communication groove 69 are cut off, and the supply of compression air to the suction pad section is automatically cut off.

Then, when the power to the solenoid 26 is cut off, the spool 7 is returned to its original position by the spring 29 and becomes ready for suction, and the vacuum breaker valve b
The pistons 55 and 56 are connected to the communication hole 44 during suction operation.
It is returned by compressed air from the communication groove 65, and is prepared for the next vacuum break. The operation of the pistons 55 and 56 of the rupture valve b, that is, the time until the piston 56 seals with the partition wall 53 is the supply time of rupture air to the suction pad section, and its control is controlled by the advance of the adjustment rod 61, This is done by adjusting the opening degree (displacement amount) of the communication hole 64 of the spool 62 upon return.

That is, according to the present invention, without using a solenoid or the like, the supply time of breaking air to the suction pad part is changed by using the compressed air that is changed by stopping the supply to the ejector pump, and the piston 55,
The moving speed of the suction pad 56 can be controlled and adjusted according to the suction pad being used and the size and properties of the work to be suctioned, and furthermore, the automatic stop saves compressed air, making it economical. Furthermore, the pistons 55, 5
6 can also be restored to its original state using compressed air at the start of vacuum work, that is, at the start of compressed air supply to the ejector pump.

Next, referring to the vacuum confirmation switch c, the vacuum confirmation switch c is tightly coupled to one end surface of the vacuum source body a, and is constructed as shown in FIGS. 17 to 20. That is, a connecting portion 81 that communicates with the communication hole 47 provided in the compartment X portion of the vacuum source main body a is provided at an appropriate position of the main body 80, and a cylinder 82 and a piston 83 are further provided,
A spring 8 is installed inside the cylinder of the piston 83.
4 is fitted, and the communication hole 81 is connected to the communication hole 81.
communicated by a. Furthermore, piston 83
A stopper 91 is provided on the outside of the piston 83 to prevent the piston 83 from coming off, and an adjustment spring 85 and an adjustment screw 86 for the piston 83 are also provided.

Further, the cylinder 82 is provided with an elongated hole 87 that penetrates the outer surface of the main body 80, and the piston 83 of the elongated hole 87 is provided with a pin 88 that projects from the outer surface.

Next, on the outer surface of the main body 80, the pin 8
A micro switch 89 is provided at a position facing 8, and when the pin 88 is moved by the piston 83, the movable contact 90 of the micro switch 89
is configured to be pressed.

The vacuum confirmation switch c with the above configuration is the vacuum source body a.
is operated and the compartment X becomes negative pressure, the communication hole 47 of the vacuum source main body a, the communication hole 81 of the vacuum confirmation switch c, the communication hole 81a, and the inside of the cylinder 83 become negative pressure, and the piston 83 moves. , the piston 8
A pin 88 implanted in 3 connects a micro switch 89, etc., and the suction pad can be moved only after confirming safe suction using the electric signal, which is safe.

As described above, according to the present invention, complete suction can be confirmed and suction can be quickly released, and since the vacuum source main body, vacuum break valve, and vacuum confirmation switch are integrated, the response is extremely fast. It is compact and can perform economical and safe suction release according to the size, properties, etc. of the suction pad and the workpiece to be suctioned.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 to Fig. 5 show the whole, Fig. 1 is a front view, and Fig. 2 is a front view.
The figure is a rear view, the third figure is a top view, the fourth figure is a bottom view,
Fig. 5 is a right side view, Figs. 6 to 11 show the main body of the vacuum source, Fig. 6 is a vertical sectional view of the main part, Fig. 7 is a plan view, Fig. 8 is a bottom view, 9 is a left side view partially indicated by a chain line, FIG. 10 is a right side view partially indicated by a chain line, FIG. 11 is a sectional view taken along line E-E in FIG. 6, and FIG. Figures 16 to 16 show the vacuum breaker valve, Figure 12 is a vertical cross-sectional view of the main parts, Figure 13 is a plan view, and Figure 14 is the F of Figure 12.
-F line sectional view, Fig. 15 is a GG line sectional view of Fig. 12, Fig. 16 is a 12th line H-H sectional view,
7 to 20 show the vacuum confirmation switch, FIG. 17 is a vertical sectional view of the main part, FIG. 18 is a plan view, FIG. 19 is a sectional view taken along line I-I in FIG. 17, and FIG. FIG. 17 is a sectional view taken along line J-J in FIG. 17; a... Vacuum source body, b... Vacuum break valve, c... Vacuum confirmation switch.

Claims (1)

[Claims] 1. A vacuum source main body having a switching control section for supplying compressed air to an ejector pump or a vacuum breaker valve, an ejector pump and suction pad connection section, and a vacuum source main body that is tightly coupled to one side of the vacuum source main body, A communication groove is provided through which the compressed air switched when the supply of compressed air to the ejector pump is stopped is introduced from the vacuum source main body, and a communication groove is provided through which the introduced compressed air is supplied to the suction pad connection part. Compressed air is supplied when compressed air starts to be supplied to the piston that is moved by the introduction of the compressed air and blocks the communication groove, and the displacement adjustment section and ejector pump provided in the compartment on the opposite side of the piston. a vacuum breaker valve having a compressed air communication groove for returning the piston to its original state, and a micro switch tightly coupled to one side of the vacuum source body and operated by the piston that is moved when the ejector pump is in operation. A vacuum control device characterized by comprising a switch.