JPS62227465A - Apparatus for quantitatively emitting high viscosity material - Google Patents

Abstract

PURPOSE:To stabilize the emission of a material within a short time, in turning an emitting gun ON, by applying high pressure into a rearward oil chamber from a high pressure supply circuit at first to acting initial dynamic pressure on a piston. CONSTITUTION:Before a high viscosity material W such as a sealant or an adhesive is emitted from an emitting gun 8, the forcing pressure of a hydraulic piston 11 is set to a predetermined value corresponding to the emitting pressure of the material W. When the emitting gun 8 is turned ON, the pressure of the rearward hydraulic chamber 14 in a hydraulic cylinder 10 is set to pressure higher than set pressure by respective hydraulic pressure control circuits 23-25. As a result, by the action in the vicinity of dynamic pressure of the hydraulic oil supplied from a high pressure supply circuit 50, the material W is emitted from the emitting gun 8 and the flow amount of the material W from the emitting gun 8 becomes constant in a short period and the material can be emitted under stable emitting pressure.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a high viscosity material metering dispensing device for applying a high viscosity material such as a sealant or adhesive, and in particular,
The thickness of the applied high viscosity material can be changed to a desired thickness in a short time.

(Prior Art) In order to maintain the airtightness and watertightness of an automobile body and to prevent rust, a sealing material, which is a high-viscosity material, is applied to the joints of the panels of an automobile body. Application of such high viscosity fluids is performed automatically using industrial robots, but it is necessary to vary the amount of high viscosity material to be applied depending on the location on the object to be applied. There is.

For this purpose, the plunger in the material cylinder, into which high-viscosity material was conventionally supplied, and the hydraulic piston in the hydraulic cylinder are connected, and the actuating material is supplied into the rear oil chamber formed in the hydraulic cylinder. I was trying to change the oil pressure.

However, with such a structure, it is not possible to discharge high-viscosity material with high precision, and therefore a fixed-quantity dispensing device as shown in FIG. 3 was developed.

As shown in the figure, a high viscosity material (sealing material) W in a container 2 is supplied into a material cylinder 1 via a supply hose 4 by driving a pump 3 . This supply hose 4 is allowed to flow into the material cylinder 1,
A check valve 5 is provided to prevent flow in the opposite direction. In addition, the discharge port 6 provided in the material cylinder 1 has
A discharge gun 8 is connected to the discharge hose 7, and the high viscosity material W is discharged from the discharge gun 8.

A plunger 9 is provided in the material cylinder 1 so as to be reciprocally movable, and in order to drive the plunger 9, the plunger 9 is connected by a rod 12 to a piston 11 in a hydraulic cylinder 10. Inside this hydraulic cylinder 10,
A front oil chamber 13 and a rear oil chamber 14 are formed. A hydraulic pressure supply circuit 15 is connected to the rear oil chamber 14 for setting the inside pressure to a predetermined pressure. This hydraulic supply circuit 15
is a hydraulic pump 17 that discharges 0 hydraulic oil from the tank 16.
The oil passage 18 has a filter 19, a pressure reducing valve 20. Modular valve 21 for adjusting flow rate
is provided, and the pressure reducing valve 20 is turned on and off by a solenoid valve 22.

Three pressure control circuits 23 to 25 are connected between the front oil chamber 13 and the tank 16 in order to set the inside of the front oil chamber 13 to three types of pressure states.

Each of the pressure control circuits 23 to 25 includes electromagnetic valves 26 to 28 that open and close the flow paths, and flow rate control valves 29 to 31. Further, the hydraulic pressure supply circuit 15 and the pressure control circuit 23 to
A solenoid valve 32 is provided to control opening and closing of the valve 25. This solenoid valve 32 has a position 32a that supplies hydraulic oil from the pump 17 to the rear oil chamber 14 and returns hydraulic oil in the front oil chamber 13 to the tank 16, and a position that supplies hydraulic oil in the opposite direction. 32b, and a neutral position as shown, which is a state between these, and in the neutral position, each of the pressure control circuits 23 to 25 is in conduction with the tank 16.

However, in a high-viscosity fluid fixed-rate dispensing device as shown in Fig. 3, the material to be discharged becomes thicker or thinner at the start of dispensing the material, and it takes time to reach a stable discharge amount. There was a problem that it took a while. For this reason, when applying the sealing material W, which is a highly viscous material, to the object to be coated by operating the discharge gun 8 using an industrial robot, when applying the material while changing the bead width one after another in a short cycle time, The time it takes for the material discharge pressure to reach a stable range,
In other words, it takes a long response time, and it is not possible to obtain the predetermined set flow rate, that is, the bead width, in a short time.If the starting position is too thick, the material W will not only protrude, resulting in poor production, but also waste of material. Become.

Furthermore, if it is thin, it will not be possible to cover the required sealing area, and a sufficient sealing effect will not be obtained.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to achieve a set flow rate in a short time, and to ensure that the desired flow rate is achieved even when coating a high viscosity material in a short cycle time. The purpose is to make it possible to apply materials with

(Means for Solving the Problems) The present invention to achieve the above object connects a discharge gun for discharging a high viscosity material and a discharge port of a material cylinder, and the high viscosity material supplied into the material cylinder is A plunger that pressurizes the viscous material is connected to a piston of a hydraulic cylinder, a hydraulic control circuit for setting a plurality of pressures in the pressure is connected to the front oil chamber of the hydraulic cylinder, and a hydraulic control circuit is connected to the rear oil chamber of the hydraulic cylinder. a high pressure supply circuit that sets a pressure in the rear oil chamber to a pressure higher than the pressure when discharging the high viscosity material from the discharge gun; This is a high viscosity material fixed quantity dispensing device connected to the rear oil chamber.

(Function) When discharging high-viscosity material from the dispensing gun, the piston receives pressure in the forward direction due to pressure from the high-pressure supply circuit.As a result, the piston initially receives dynamic pressure and dispenses the material. Therefore, the time required for the discharge amount to reach a stable state is shortened.

(Example) Hereinafter, the present invention will be explained based on the drawings. FIG. 1 is a diagram showing a high-viscosity material quantitative coating apparatus according to an embodiment of the present invention, and parts common to those in the apparatus shown in FIG. 2 are given the same reference numerals.

The structures of the material cylinder 1, hydraulic cylinder 10, discharge gun 8, etc. are the same as those shown in FIG.
The material W supplied into the material cylinder 1 is supplied to the discharge gun 8 by driving the plunger 9 in the material cylinder 1 with the piston 11 in the hydraulic cylinder 10. It is discharged from. The discharge gun 8 is held by an arm of an industrial robot (not shown) and moves along the object to be coated.

In the front oil chamber 13 in the hydraulic cylinder 10, three hydraulic control circuits 23 to 23 are installed in order to set the pressure therein to three types.
25 are connected. The hydraulic control circuit 23 is connected to the front oil chamber 1
The hydraulic control circuit 24 is a circuit for setting the inside of the front oil chamber 13 to the highest pressure P1, and the hydraulic control circuit 24 is a circuit for setting the inside of the front oil chamber 13 to a lower pressure P2.
5 is a circuit for setting the inside of the front oil chamber 13 to the lowest pressure P3. In other words, each pressure is Pl>P2
>The relationship is P3. This pressure state is
It is set by controlling the flow rate of hydraulic oil flowing in each circuit using flow control valves 29 to 31 provided in each hydraulic control circuit 23 to 25.

For example, when the pressure of the hydraulic oil in the front oil chamber 13 is Pl, the pressure in the discharge hose 7 is a pressure P1 determined by the ratio of the area of the piston 11 and the area of the plunger 9.
It becomes a. Similarly, if P2 becomes P2a, it becomes P2a,
When it becomes P3, it becomes P3a.

Three hydraulic supply circuits 40 to 42 are connected to the oil passage 15 that connects the hydraulic pump 3 and the rear oil chamber 14 of the hydraulic cylinder 10, and each hydraulic pressure supply circuit 40 to 42 has a circuit that opens and closes the circuit. Solenoid valves 43 to 45 and pressure reducing valves 46 to 48 for controlling the hydraulic pressure in the circuit are provided.

The pressure of the hydraulic oil supplied into the rear oil chamber 14 through the hydraulic pressure supply circuit 40 is set to Pl by the pressure reducing valve 46,
The pressure of the oil supplied into the rear oil chamber 14 through the hydraulic pressure supply circuit 41 is set to P2 by the pressure reducing valve 47, and the pressure of the oil supplied into the rear oil chamber 14 through the hydraulic pressure supply circuit 42 is set to P2. , is set to P3 by the pressure reducing valve 48.

A high-pressure supply circuit 50 is further connected between the rear oil chamber 14 and the hydraulic pump 17, and this circuit 50 supplies hydraulic oil at a pressure P from the hydraulic pump 17 directly into the submerged oil chamber 14. A solenoid valve 51 is provided for controlling the operation. Therefore, the pressure P of the oil supplied from this high pressure supply circuit 50 into the rear oil chamber 14 is equal to the pressures P1, P2, and P2 described above.
The pressure is set higher than any of 3. In other words, P
The relationship is set such that >Pl >P2 >P3.

The above-mentioned solenoid valves 26-28, 32, 43-45, and 5
The opening/closing operation of the discharge gun 1 is controlled by a control means (not shown) in conjunction with an industrial robot that operates the discharge gun 8.

Next, regarding the operating state of the above-mentioned fixed amount dispensing device,
This will be explained with reference to the time chart shown in the figure. In FIG. 2, the front oil chamber 13 is first controlled by the flow control valve 31.
After setting the internal pressure to the lowest P3 and discharging the material W from the discharge gun 8 at the pressure p3a,
The flow control valve 29 sets the pressure in the front oil chamber 13 to the highest Pl.
The flow control valve 30 sets the pressure in the front oil chamber 13 to a pressure P2 lower than Pl to discharge the material W at a pressure P2a. There is.

When the discharge gun 8 is operated in such a procedure, as shown in FIG. The hydraulic oil supplied at pressure P is reduced in pressure by the pressure reducing valve 48, and the pressure in the hydraulic supply circuit 42 is reduced to P3.

Further, the solenoid valve 32 is turned on at the position 328, and the solenoid valve 32 is turned on at the position 328.
Since valve 1 is on, the hydraulic oil flows to modular valve 2.
1 and enters the rear oil chamber 14 and pushes the piston 11. The material W such as a sealing material filled from the supply hose 4 into the material cylinder 1 has a pressure of P3a depending on the area ratio of the piston 11 and plunger 9. In this state, when the discharge gun 8 is turned on, that is, when a needle (not shown) inside the discharge gun is opened, the solenoid valve 45 is simultaneously turned off and the solenoid valve 51 of the high pressure supply circuit 50 is turned on.

Thereby, when discharging the material W from the discharge gun 8, the piston 11 is pressed in the forward direction with a high pressure P. The flow rate of the hydraulic oil in the front oil chamber 13 is adjusted by the flow rate control valve 31 and returns to the tank 16 through the hydraulic control circuit 25. Since the discharge amount at this time is adjusted by the flow rate control valve 31, the material continues to be applied from the discharge gun 8 at the pressure P3a.

When the coating operation is completed, the discharge gun 8 is turned off, the solenoid valve 51 is turned off, and the solenoid valve 45 is turned on. Next, in order to perform work using the hydraulic control circuit 23, first turn off the solenoid valves 28 and 45, turn on the solenoid valve 43 to put the hydraulic pressure supply circuit 40 into operation, and turn on the solenoid valve 26 to turn on the hydraulic control circuit. 23 is kept in operation. As a result, the pressure of the material is p due to the relationship pla>p3a.
rises to la. When the discharge gun 8 is turned on, the solenoid valve 43 is turned off and the solenoid valve 51 is turned on.

As a result, pressure P acts within the rear oil chamber 14 within the hydraulic cylinder 10.

Next, we move on to the work using the hydraulic control circuit 24.
Since it is P2a, it is necessary to handle the pressure of the material W.

Therefore, when the work by the hydraulic control circuit 23 is completed and the discharge gun 8 is turned off, the solenoid valve 32 is set to the neutral position as shown, and the solenoid valve 51 is turned off. Then, the piston 11 is retracted by the pressure in the front oil chamber 13 due to the residual pressure of the material W, the hydraulic oil in the rear oil chamber 13 is returned to the tank 16, and the pressure of the material W decreases. Then, after a certain period of time has elapsed after turning off the solenoid valve 26 and turning on the solenoid valve 27, the solenoid valve 44 is turned on and the solenoid valve 32 is turned on.
Turn it on at position 2a. As a result, the piston 11
is pressed under pressure P2, and in this state, the discharge gun 8 is turned on, and at the same time, the solenoid valve 51 of the pressure supply circuit 50 is turned on, and the hydraulic control circuit 24 is activated to discharge the material W. . In addition, when supplying the high viscosity material W into the material cylinder 1, the solenoid valve 32 is moved to position 3.
2b to supply hydraulic oil into the front oil chamber 13, the piston 11 is moved backward.

In this manner, in the quantitative dispensing device of the present invention, before discharging the material W from the dispensing gun 8, the pressing pressure of the hydraulic piston 11 is set to a predetermined value according to the discharging pressure of the material W. the hydraulic cylinder 1 when turning on the discharge gun 8.
The pressure in the rear oil chamber 14 within 0 is brought to a higher pressure state than the pressure set by each hydraulic control circuit 23 to 25.

As a result, the material W is discharged from the discharge gun 8 due to the action near the dynamic pressure of the hydraulic oil supplied from the high-pressure supply circuit 50, and the flow rate of the material W from the discharge gun 8, that is, the bead width, is reduced in a short time. This makes it possible to discharge the material with a stable discharge pressure. In the illustrated embodiment, three hydraulic control circuits and three hydraulic supply circuits are provided, but more than three hydraulic pressure control circuits and three hydraulic pressure supply circuits may be provided.

(Effects of the Invention) As described above, according to the present invention, the pressure at which the piston presses the material is set by the hydraulic control circuit connected to the front oil chamber, and the hydraulic pressure supply circuit connected in advance to the rear oil chamber Since a predetermined pressure is applied to the piston from the rear oil chamber, and when the discharge gun is turned on, high pressure is applied from the high pressure supply circuit to the rear oil chamber. The dynamic pressure of the hydraulic oil acts on the piston, and the material discharge pressure reaches a stable range in a short time.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an apparatus for dispensing a fixed amount of high viscosity material according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing the operating state of the dispensing apparatus of the present invention shown in FIG. FIG. 2 is a circuit diagram showing a device before the quantitative feeding device of the present invention was developed. DESCRIPTION OF SYMBOLS 1... Material cylinder, 2... Container, 3... Pump, 7... Discharge hose, 8... Discharge gun, 9... Plunger, 10... Hydraulic cylinder, 11... Piston, 13... Front oil chamber, 14... Rear oil chamber, 17.
・Hydraulic pump, 23-25 ・Hydraulic control circuit, 29
~31...Flow rate control valve, 40~42...Hydraulic pressure supply circuit, 50...High pressure supply circuit. Patent applicant Nissan Motor Co., Ltd.
Nippon Gray Co., Ltd. @2 diagram

Claims (1)

[Claims] A discharge gun that discharges a high viscosity material is connected to a discharge port of a material cylinder, a plunger that pressurizes the high viscosity material supplied into the material cylinder is connected to a piston of a hydraulic cylinder, and the front oil of the hydraulic cylinder is A hydraulic control circuit for setting the pressure in this chamber to a plurality of types is connected to the chamber, a hydraulic pressure supply circuit for setting the pressure in the hydraulic cylinder to a type corresponding to the pressure is connected to the rear oil chamber of the hydraulic cylinder, and the discharge A high-viscosity material quantitative dispensing device comprising: a high-pressure supply circuit connected to the rear oil chamber to set the pressure in the rear oil chamber to a higher pressure than the pressure when the high-viscosity material is discharged from the gun.