JPH081021Y2 - Viscous material feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a viscous material supply device, and more specifically, it includes a bellows pump for discharging a viscous material from a viscous material tank to a coating device, and uses this bellows pump. The present invention relates to a viscous material supply device that also performs cleaning.

(Prior art) In the work of attaching wind glass to the body of an automobile, etc., wipe off the dirt adhering to the adhesive surface with a cotton cloth soaked in degreasing liquid etc. to clean it, and then check the affinity of the adhesive for the glass surface. To increase the viscosity, a viscous primer is applied to the glass side by an application device. Then, an adhesive is applied to the primer application surface, and the window glass is attached by pressure adhesion to the vehicle body side. An automatic window glass attachment device for automatically performing a series of these operations is disclosed in Japanese Patent Laid-Open No. 61-27507.
It is described in No. 1 gazette.

Here, since the primer as described above has a viscosity, it is often discharged and supplied from the tank to the coating device by a special bellows pump. This bellows pump is a reciprocating pump in which a piston is formed in a bellows shape.It does not have an opening / closing mechanism such as a valve body or a rotating mechanism inside, and is configured to avoid troubles due to adhesion of the primer. The primer is discharged and supplied by a low-speed reciprocating operation.

(Problems to be solved by the invention) However, since the above-mentioned primer easily sticks, it is often necessary to clean the bellows pump, the piping system, etc.,
In order to perform the cleaning efficiently, it is necessary to introduce a large amount of cleaning liquid having a low viscosity from a cleaning liquid supply passage separately connected to a bellows pump or a piping system and to circulate the cleaning liquid quickly. However, at the operating speed of the bellows pump during normal primer discharge supply, the discharge amount is so small that sufficient cleaning cannot be achieved.

The present invention has been made in view of such circumstances, and an object thereof is to provide a viscous material supply device capable of effectively cleaning a bellows pump and a piping system for discharging and supplying the viscous material.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a viscous material tank 1 and material supply passages 2A, 2B, 2C for the viscous material tank 1.
And the material supply passage 2 connected to each other via the coating device 3.
Bellows pumps 4A, 4B which are interposed in A, ... and discharge the viscous material in the viscous material tank 1 to the coating device 3
And a drive source 7 for driving the bellows pumps 4A, 4B. In this configuration, a cleaning liquid supply passage 6 that is connected to the downstream end side of the bellows pumps 4A and 4B via a switching valve 19 to supply a cleaning liquid, and the bellows pumps 4A and 4B.
Open / close valves 15A, 15 for opening / closing the material supply passages 2A, 2B on the upstream side of B
B, and a control unit 8 for controlling the output adjustment of the drive source 7 and the opening / closing of the on-off valves 15A and 15B, respectively. And
A cylinder 25 having the suction port 29 provided on the upstream end side and the discharge port 30 provided on the downstream end side, and the piston rod which is driven by the drive source 7 and reciprocates in the cylinder 25. 33, and a bellows piston provided on the tip end side of the piston rod 33 and capable of expanding and contracting in the reciprocating direction.
26 and. Further, when the control unit 8 supplies the viscous material to the coating device 3, the opening / closing valves 15A and 15B are closed when the bellows piston 26 is operated to the upstream end side of the cylinder 25. On the other hand, the on-off valves 15A and 15B are configured to be opened when they are operated to the downstream end side. In addition, the control unit 8 is connected to the bellows pump 4
When cleaning A, 4B and the upstream material supply passages 2A, 2B, the output of the drive source 7 is adjusted so that the operating speed of the piston rod 33 is higher than that when supplying the viscous material. And when the bellows piston 26 is operated to the upstream end side of the cylinder 25, the open / close valves 15A and 15B are opened, while the open / close valve is operated to the downstream end side.
It is configured so that 15A and 15B are closed.

(Operation) When the viscous material is supplied from the viscous material tank 1 to the applicator 3, the opening / closing valves 15A and 15B are controlled by the control unit 8 and the bellows piston 26 of the bellows pumps 4A and 4B is moved to the cylinder 25.
Since the on-off valves 15A and 15B are closed when they are operated to the upstream end side, the suction port 29 side is closed, and in this state the bellows piston 26 moves to the upstream end side, The viscous material is discharged from the discharge port 30 and the coating device 3
Is supplied to. On the contrary, the bellows piston 26 is replaced by the cylinder 25.
When the on-off valves 15A and 15B are opened when operated to the downstream end side of the cylinder 25, the suction port 29 is opened, and in this state, the bellows piston 26 moves to the downstream end side of the cylinder 25.
The viscous material from the viscous material tank 1 is sucked into the inside. Then, the reciprocating movement of the bellows piston 26 repeats the above-described discharge and suction, and the viscous material is supplied to the coating device 3.

On the other hand, the bellows pumps 4A, 4B and the upstream material supply passage 2A,
When cleaning 2B, the on-off valves 15A and 15B are connected to the control unit 8
The bellows piston 26 is controlled by the cylinder 25
When the on-off valves 15A and 15B are closed when actuated to the downstream end side, the suction port 29 is closed, and the bellows piston 26 moves to the downstream end side in this state, thereby switching valve
The cleaning liquid from the cleaning liquid supply passage 6 which is in the communication state by 19 is sucked into the cylinder 25 through the discharge port 30. Conversely, when the bellows piston 26 is actuated to the upstream end side of the cylinder 25, the opening / closing valves 15A and 15B are opened, so that the suction port 29 is opened, and in this state, the bellows piston 26 is upstream end. By moving to the side, the cleaning liquid in the cylinder 25 is discharged from the suction port 29 toward the upstream side and flows back through the material supply passages 2A and 2B. At this time, the control unit 8
By this, the output of the drive source 7 is adjusted so that the operating speed of the piston rod 33 becomes higher than that at the time of supplying the viscous material, so that the repeating speed of suction and discharge of the cleaning liquid in the bellows pumps 4A, 4B is repeated. Is faster than when supplying the viscous material, and the bellows piston 26 contracts faster,
As a result, the cleaning liquid is backflowed in a large amount at a speed faster than the speed and amount of the viscous material at the time of supplying the viscous material, thereby effectively cleaning the inside of the complicated bellows pumps 4A, 4B and the material supply passages 2A, 2B. Done.

(Advantage of the Invention) According to the viscous material supply device of the present invention, the output of the drive source 7 is controlled by the control unit 8 and the opening / closing valves 15A, 15B are controlled to open and close to the viscous material coating device 3 by the bellows pumps 4A, 4B. Can be reliably supplied, and at the time of cleaning, the bellows pumps 4A, 4B and the material supply passages are swiftly supplied by the flow of a large amount of backwashing liquid in consideration of the contraction of the bellows pumps 4A, 4B due to the increased operating speed. 2A, 2B, etc. can be effectively cleaned.

(Example) Below, this invention is demonstrated in detail based on the drawing which shows the example.

The viscous material supply device shown in the present embodiment is a device in which a bellows pump for supplying a primer used for adhering window glass or the like to a coating device can be effectively washed, and is configured as follows.

As shown in FIG. 2, a pair of bellows pumps 4A and 4B for supplying and discharging the viscous material from the viscous material tank 1 to the coating device 3 via the material supply passages 2A and 2B are provided, and the bellows pumps 4A and 4B are provided. A cleaning liquid supply passage 6 from the cleaning liquid tank 5 is connected to the. A control unit 8 is connected to the motor 7 (see FIG. 1) as a drive source of the bellows pump 4, and when the washing liquid is introduced into the bellows pump 4 for washing, the control unit 8 controls the motor 7 The output of the motor 7 is adjusted so that the operating speed is higher than that during the discharging operation for supplying the viscous material, and effective cleaning is performed.

To be more specific, on the upstream side of the primer tank 1,
A desiccant tank 13 and a curing prevention solvent tank 14 are connected via a vapor pressure feed pump 12 driven by a motor 11. Then, electromagnetically operated on-off valves (hereinafter referred to as electromagnetic valves) 15A, 15B are connected to the upstream ends of the bellows pumps 4A, 4B, while electromagnetic valves 16A, 16B are connected to their downstream ends. There is. This solenoid valve 16A, 16B and bellows pump 4A, 4B
Between each discharge port 30 (see FIG. 3) of each solenoid valve 15A,
Pressure sensors 17A and 17B are provided for detecting clogging states of 15B, 16A and 16B.

Both material supply passages 2A, 2B merge into one material supply passage 2C downstream of the solenoid valves 16A, 16B, and the solenoid valve 18
And a three-way switching valve 19 is provided, and a solenoid valve is provided at its downstream end.
A coating device 3 having 20 is connected. A purge tank 22 for recovering the coating residue of the primer is disposed below the coating device 3, and a vapor pressure pump 24 driven by a motor 11 receives supply of solvent vapor from a curing prevention solvent tank 23. It is like this. On the other hand, a cleaning liquid supply passage 6 from the cleaning liquid tank 5 is connected to the three-way switching valve 19, and the cleaning liquid tank 5 side of the cleaning liquid supply passage 6 is used to switch between pressure supply of the cleaning solvent and pressure supply of blow air. A three-way valve 21 is connected.

The bellows pumps 4A and 4B have substantially the same structure. As shown in FIG. 3, the bellows pump 4 has a flat plate-shaped connecting member in which a bellows piston 26 in a cylinder 25 standing on a base 41 is erected.
This ball screw 28 is connected to the ball screw 28 via 27.
Is vertically driven by the motor 7 mounted and fixed on a support member 42 provided upright on a base 41, and the bellows piston
26 is adapted to reciprocate in the cylinder 25. As shown in FIG. 1, the connecting member 27 includes a base 41 and a supporting member.
It is fixed to guide members 45 and 46 which are fitted and guided by a pair of guide rods 43 and 44 which are vertically fixed between 42 and 42,
The bellows piston 26 moves up and down together with the ball screw 28 to reciprocate the bellows piston 26, and in cooperation with the solenoid valves 15A and 15B described above, the primer sucked from the suction port 29 provided in the lower portion of the cylinder 25 is discharged from the upper discharge port 30. It is configured to discharge (see FIG. 3). Although not shown, on the right side of the bellows pump 4A in FIG. 1, a bellows pump 4B and its drive source are arranged substantially symmetrically with the bellows pump 4A.

More specifically, as shown in FIGS. 3 and 4,
The bellows piston 26 has a flange 32a integrally formed on the upper part of an expandable bellows 32 in which a plurality of flexible discs 31 made of ethylene tetrafluoride are stacked and arranged at equal intervals, and is bolted to the upper part of the cylinder 25. While pressing and fixing with the lid 25a,
Connect the pointed head 34 to the bottom of the ball screw 28
The piston rod 33, which is connected to, is passed through the bellows 32 and fixed to the head portion 34 by bolting. The bottom of the cylinder 25 is formed into an inverted conical shape corresponding to the head portion 34, and the suction port is formed at the center thereof.
29 are provided.

With such a configuration, when the bellows piston 26 moves downward, that is, moves to the upstream end side, the solenoid valves 15A, 15B
(See FIG. 2) is closed by the control unit 8 to be described later to close the suction port 29, and the primer already introduced below the head unit 34 is released upward from the gap between the outer periphery of the head unit 34 and the cylinder 25 (see FIG. 2). (See FIG. 4), the discharge is performed from the discharge port 30 through the outer circumference of each disk 31 whose diameter is reduced by the expansion of the bellows 32. When the bellows piston 26 moves upward, that is, moves to the downstream end side, the solenoid valves 15A and 15B are opened by the control section 8 and the contraction of the bellows 32 causes the primer between the discs 31 to move upward. While being discharged from the discharge port 30, a new primer is sucked below the head portion 34. As will be described later, when cleaning,
The control unit 8 causes the solenoid valves 16A and 16B to move the bellows piston 26.
It is opened and closed in conjunction with.

On the other hand, as shown in FIG. 1, a connecting rod 27 connecting the bellows piston 26 with the ball screw 28 is vertically fixed with a support rod 37 in which a pair of contacts 35, 36 made of nut members are screwed together. The limit switches 51, 52 that make contact with the contacts 35, 36 are fixed to the support member 42, and detect the vertical movement of the connecting member 27, that is, the vertical movement of the bellows piston 26, and the detection signal thereof is the control unit. 8 is sent. As described above, this is because the control unit 8 controls the solenoid valves 15A, 15B, 16A, 16 during the discharge operation and the cleaning operation.
This is because B is interlocked with the operation of the bellows piston 26 to open and close.

The controller 8 controls the motor 7 for driving the bellows piston 26 in addition to the solenoid valves 15A, 15B, 16A, 16B. This control unit 8 is composed of a microcomputer, and when it receives a discharge operation command for discharging a primer from the outside according to a preset program, it sends a low speed operation signal for rotating the motor 7 at a low speed, and a limit Based on the detection signals from the switches 51 and 52, when the bellows piston 26 moves downward, a closing operation signal is sent to close the corresponding normally open solenoid valve 15A or 15B, and the primer is discharged as described above. To do. In order to perform this discharge supply without pulsation, an actuation signal is sent so that each bellows pump 4A, 4B is alternately operated by each motor 7.

On the other hand, when the control section 8 receives the signal instructing the cleaning operation, it sends a high-speed operation signal for rotating the motor 7 at a high speed to the motor 7. This is because, as described above, in order to carry out effective cleaning, it is necessary to rapidly flow a large amount of a cleaning liquid having low viscosity. The cleaning operation is performed on the discharge side, that is, the material supply passage 2C and the coating device 3
For cleaning the supply side, that is, the bellows pumps 4A, 4B
And the case where the material supply passages 2A and 2B are washed separately. When cleaning the discharge side, a three-way switching valve is used to connect the cleaning liquid supply passage 6 and the material supply passage 2C.
19, the pump (not shown) is operated to supply the cleaning liquid from the cleaning liquid tank 5 to the coating device 3 via the cleaning liquid supply passage 6 and the material supply passage 2C as shown in FIG.
To be released from the outside. By switching the three-way valve 21 on the side of the cleaning liquid tank 5, the pressure feeding of the cleaning liquid and the pressure feeding of the blow air are appropriately switched.

On the other hand, when cleaning the pump side, first, the three-way switching valve 19 is switched so that the cleaning liquid supply passage 6 communicates with both material supply passages 2A and 2B via the solenoid valve 18,
Either one of the bellows pumps 4A or 4B is selected for cleaning, and then the other is cleaned. in this case,
By the high-speed rotation of the motor 7, the bellows piston 26 reciprocates at a high speed, and a large amount of cleaning liquid is backflowed from the bellows pump 4A or 4B to the primer tank 1 at a high speed via the material supply passage 2A or 2B. , Effective cleaning is done. That is, the solenoid valve 15A or 15B to be washed
Open, and when the bellows piston 26 moves downward, the solenoid valve 16A
Alternatively, by controlling to close 16B, it is possible to perform the backwashing as described above and clean the insides of the complicated bellows pumps 4A and 4B. At this time, the inside of the bellows pumps 4A and 4B can be effectively washed by the flow of the washing liquid accompanying the contraction of the bellows piston 26 that is operated at high speed.

Prior to this cleaning, the clogging phenomenon of the solenoid valves 15A, 15B, 16A, 16B and the like can be detected during operation by the pressure sensors 17A, 17B. That is, when the pressure sensor 17A confirms that the pressure has risen, the solenoid valve 16A or 18 determines that the pressure has dropped, and the solenoid valve 15A or the bellows pump 4A is determined to be in a clogged state. Similarly, the pressure sensor 17B can also detect the clogging phenomenon of the solenoid valves 16B, 15B or the bellows pump 4B, and can efficiently clean only the clogging occurrence portion.

Further, in the flow path configuration as described above, when it is necessary for kneading or the like, circulation from the primer tank 1 to the primer tank 1 via the bellows pump 4A via the bellows pump 4A, and from the primer tank 1 to the bellows pump. Bellows pump 4A via 4B
To the primer tank 1 can be selected and performed. That is, when performing the former, the solenoid valves 15B and 16B are opened and the solenoid valve 4A is operated,
When carrying out the latter, the solenoid valves 15A and 16A may be opened and the solenoid valve 4B may be operated.

As described above, the cleaning liquid supply passage 6 is connected to the bellows pumps 4A, 4B for supplying and discharging the primer, and the operating speed of the bellows pumps 4A, 4B at the time of cleaning is higher than that at the time of material supply. In addition, by providing the control unit 8 that adjusts the output of the motor 7 that is the drive source thereof, not only the inside of the bellows pumps 4A and 4B but also each pipe / valve system can be efficiently and effectively cleaned. it can.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a front view of a viscous material supply device and its control system, FIG. 2 is a flow path system diagram of a coating device, and FIG. 3 is a part of the viscous material supply device. FIG. 4 is a side view including a cross section, FIG. 4 is a cross section of the bellows pump, and FIG. 5 is a flow path system diagram at the time of cleaning. 1 …… Primer tank (viscous material tank), 2A, 2B ……
Material supply passage, 3 ... Coating device, 4,4A, 4B ... Bellows pump, 6 ... Cleaning liquid supply passage, 7 ... Motor (driving source),
8 ... Control part, 15A, 15B ... Open / close valve, 19 ... Switching valve (three-way switching valve), 25 ... Cylinder, 26 ... Bellows piston, 29
…… Suction port, 30 …… Discharge port, 33 …… Piston rod.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Nagata 7-1 Akita-cho, Takatsuki-shi, Osaka Sunstar Giken Co., Ltd. (56) Bibliographic references Sho 58-55971 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A viscous material tank (1), a coating device (3) connected to the viscous material tank (1) through material supply passages (2A, 2B, 2C), and the material supply passage (2). ), The bellows pump (4, 4A, 4) for discharging the viscous material in the viscous material tank (1) to the coating device (3).
B) and a drive source (7) for driving the bellows pump, in a viscous material supply device, a switching valve (19) is provided on the downstream end side of the bellows pump (4, 4A, 4B).
And a cleaning liquid supply passage (6) that is connected via the above to supply the cleaning liquid and a material supply passage (2) on the upstream side of the bellows pump (4, 4A, 4B).
Open / close valves (15A, 15B) for opening / closing A, 2b) and output adjustment of the drive source (7) and the open / close valves (15A, 15B)
And a control unit (8) for controlling the opening and closing of B). The bellows pump (4, 4A, 4B) is provided with a suction port (29) on the upstream end side and a discharge port (30) on the downstream end side. A piston rod (33) that is driven by the drive source (7) and reciprocates in the cylinder (25), and is provided on the tip end side of the piston rod (33). A bellows piston (26) capable of expanding and contracting in the reciprocating direction, and the control section (8) is configured such that when the viscous material is supplied to the coating device (3), the bellows piston (26) is a cylinder. When operated on the upstream end side of (25), the on-off valve (15A, 15B) is closed, while when operated on the downstream end side, the on-off valve (15A, 15B) is closed.
When the bellows pump (4, 4A, 4B) and the upstream material supply passages (2A, 2B) are washed while the B) is opened, the piston rod (3
The output of the drive source (7) is adjusted so that the operating speed of 3) is faster than when the viscous material is supplied, and the bellows piston (26) is located on the upstream end side of the cylinder (25). The on-off valve (15A, 15B) is opened when activated, while the on-off valve (15A, 15B) is closed when activated on the downstream end side. Characteristic viscous material supply device.