JPS621432Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a sealer pump used when attaching a vehicle windshield glass to a body flange using an adhesive sealer.

A conventional vehicle window sealer pressure pump is operated by a pump driven by compressed air, and is configured to constantly pump a high viscosity sealer for window bonding at a constant pressure. However, with the conventional sealer pressure pump mentioned above, if there is a temperature change,
Since the viscosity of the window adhesive sealer changes, the amount of sealer discharged from the sealer pump changes. When the amount of sealer discharged changes in this manner, the amount of sealer applied to the bonded portion becomes uneven, deteriorating the functional quality of the product. Conventionally, in order to eliminate fluctuations in the sealer discharge amount, the compressed air pressure supplied to the sealer pump was adjusted using a manual pressure control valve, but this work was complicated and relied on the intuition of the operator. Because of the large number of factors involved, it was difficult to maintain consistent product quality. Further, it has not been possible to adjust the discharge fluctuation during one stroke of the sealer pressure pump by manual adjustment.

In view of the above, the object of this invention is to provide a constant flow discharge pump that can always discharge a constant amount of window adhesive sealer regardless of temperature changes.

Next, this invention will be explained based on embodiments shown in the drawings.

In the figure, the sealer pressure pump 1 has a discharge port 3.
There is a pump cylinder 2 with a lower end located in a material drum 4 which stores a sealer S for window bonding. The pump cylinder 2 is provided with a piston rod 5 that moves upward and downward within the pump cylinder. A shovel 6 for pumping up sealer is attached to the lower end of the piston rod 5, and a piston 8 in an air cylinder 7 is attached to the upper end. The air cylinder 7 has an upper end connected to the electromagnetic switching valve 10 through a conduit 9, and a lower end connected to the electromagnetic switching valve 10 through a conduit 11. The electromagnetic switching valve 10 is connected via a conduit 12 to a replicator 13, and the reuplicator 13 is connected via a conduit 14 to a filter 15.
It is connected to the. The filter 15 is then connected to a compressor 17 by a conduit 16.

The sealer pressure pump 1 has a discharge port 3 connected to a nozzle 19 through a connecting pipe 18.

When the electromagnetic switching valve 10 is in the state shown in FIG. 7 into the upper chamber 7a, and the piston 8
Press down. The air in the lower chamber 7b of the air cylinder 7 as the piston 8 descends is pushed out, and the conduit 11
From there, it returns to the electromagnetic switching valve 10 and is discharged from this switching valve 10 to the outside. On the other hand, as the piston 8 descends, the shovel 6 at the lower end of the piston rod 5 enters the sealer S in the material drum 4. Then, when the direction of the electromagnetic switching valve 10 is switched, the compressed air flows into the lower chamber 7b of the air cylinder 7, the piston 8 rises, and the air in the upper chamber 7a is released from the electromagnetic switching valve 10 to the outside. Ru. On the other hand, as the piston 8 rises, the shovel 6 at the lower end of the piston rod 5 pumps up the sealer S in the material drum 4. Then, the sealer S pumped up by the shovel 6 is temporarily held within the pump cylinder 2. When the piston 5 descends, a certain amount of sealer S is pushed up inside the pump cylinder 2 and is discharged from the nozzle 19 via the discharge port 3 and the connecting pipe 18.

A speed detector 20 for detecting the reciprocating speed of the piston rod 5 of the sealer pressure pump 1 is provided adjacent to and on the side of the piston rod 5, and is also connected to the control unit 21 via a conductive wire 28. . This control unit 21 is connected via a conductor 29 to a servo pressure control valve 22 attached to a conduit 14 between the filter 15 and the replicator 13.

FIG. 2 shows a block diagram of a constant discharge control mechanism of the sealer pressure pump 1 including a control unit 21. As shown in FIG.
The control unit 21 includes a variable resistor 23, a V-F converter 24, a deviation counter 25, and a D-A converter 26.
and an amplifier 27. The control unit 21 sets the reciprocating speed of the piston rod 5 to a desired speed by changing the voltage value externally applied to the V-F converter 24 using the variable resistor 23.

Next, the operation of this embodiment will be explained.

After setting the reciprocating speed of the piston rod 5 of the sealer pressure pump 1 to a predetermined speed by the control unit 21, compressed air is sent from the compressor 17.
Activate the sealer pressure pump 1. On the other hand, when the variable resistor 23 adjusts the reciprocating speed of the piston rod 5 to a desired value and a voltage is applied to the V-F converter 24, this voltage is applied to the V-F converter 24.
4, the signal is converted into a digital signal and then sent to the deviation counter 25. Also, this deviation counter 25
receives a feedback signal from a speed detector 20 which detects the speed of the piston rod 5 of the sealer pressure pump 1. Deviation counter 25 is V-F converter 2
4 and the speed detector 20, and if there is a deviation between the two signals, the deviation signal is sent to the DA converter 26. The deviation signal sent to the DA converter 26 is converted into an analog signal here, and then sent to the amplifier 27 where it is amplified and sent to the servo pressure control valve 22. The servo pressure control valve 22 is actuated by an analog signal sent from the amplifier 27 to regulate the compressed air pressure flowing through the conduit 14, so that the reciprocating speed of the piston rod 5 of the sealer pressure pump 1 is at a set speed.

In this way, when the reciprocating speed of the piston rod 5 (therefore the piston 8) of the sealer pressure pump 1 becomes constant, the sealer S pumped up by the shovel 6
The amount of sealer S is constant, and the amount of sealer S discharged from the nozzle 19 is constant regardless of temperature changes and the like.

As mentioned above, this device is equipped with a pressure pump for a double-acting cylinder-type window adhesive sealer, a speed detector that detects the reciprocating speed of the piston of this pump, and a signal output from this speed detector that is set in advance. A control unit compares the piston reciprocating speed signal and outputs a feedback signal, and based on the signal output from this control unit, controls the pressure of compressed air sent to the switching valve to control the reciprocating speed of the piston and control the amount of sealer discharged from the pressure pump. By providing a servo pressure control valve for controlling the servo pressure control valve and configuring a constant flow rate discharge pump for window adhesive sealer, the following effects can be obtained.

(1) The sealer pressure pump for window bonding can optimize the sealer discharge flow rate by keeping the piston speed at the set speed even if the sealer's viscosity changes due to temperature changes, improving the quality of the window. In addition, since excess sealer is not discharged, the sealer cost can be reduced.

(2) It is no longer necessary to manually adjust the compressed air pressure of the window bonding pressure pump as in the past, and the number of man-hours can be reduced.

[Brief explanation of the drawing]

The figures show one embodiment of this invention, with FIG. 1 being a system diagram of a constant flow rate discharge pump for window bonding sealer, and FIG. 2 being a block diagram of a constant discharge control mechanism including the control unit of FIG. 1. 1... Sealer pressure pump, 5... Piston rod, 7... Air cylinder, 8... Piston, 10...
...Solenoid switching valve, 17...Compressor, 19...
Nozzle, 20...speed detector, 21...control unit, 22...servo pressure control valve, S...sealer.

Claims (1)

[Scope of utility model registration request] In a pressure pump for a double-acting cylinder-type window adhesive sealer that reciprocates a piston via a switching valve that switches compressed air supplied to the cylinder, there is provided a speed detector that detects the reciprocating speed of the piston, and a speed detector that detects the reciprocating speed of the piston. a control unit that compares the signal output from the switch with a preset piston reciprocating speed and outputs a feedback signal; and a servo that controls the pressure of compressed air sent to the switching valve based on the feedback signal output from this control unit. A constant flow discharge pump characterized by being provided with a pressure control valve.