JP4765044B2 - Method and system for reducing remaining amount in transfer of viscous fluid - Google Patents

Description

  In the present invention, a viscous fluid such as an adhesive contained in a container (for example, a drum can) is transferred to a place of use (for example, an automatic gun, a manual gun, or a metering discharge device), the inside of the container becomes empty, and another container The present invention relates to a method and a system for reducing the remaining amount in the transfer of viscous fluid for the purpose of reducing residual adhesive and the like in an empty container as much as possible.

Conventionally, the contents of the drum can be used after the viscous fluid of the drum can be used after the previous use, but the residual adhesive in the drum can should be as little as possible, but the residual amount can be accurately recognized. It was considered difficult. Therefore, for the sake of safety, while the residual viscous fluid remains somewhat large, the removal from the drum cans of the previous use was terminated and replaced with drums for the later use, so the residual adhesive would be 15 kg or more. Was not uncommon.
JP 2001-263222 A JP-A-9-67547

  According to the conventional apparatus, since the residual amount of the adhesive in the drum can depends on the user's intuition, it is difficult to make the residual amount constant. That is, if the residual viscous fluid is too small, air is sucked in at the time of suction, and bubbles are included in the viscous fluid, which may cause poor adhesion and other problems.

  In order to solve the above problem, if the container is replaced while the residual fluid is somewhat large, there is little risk of bubbles being introduced, but as a result, a large amount of unused viscous fluid (residual viscous fluid) is present. As a result, there was a problem that was actually uneconomical. That is, it is difficult to quantitatively clarify the residual viscous fluid.

  However, according to the present invention, when the amount of viscous fluid in the container decreases, the pump shaft rises and falls during the transfer, the pressure after the pump outlet fluctuates, and the elevator pump descends. Since knowledge such as a change was obtained, at least one of the three points was detected (measured), thereby solving the conventional problem.

  That is, the method invention is a method for supplying viscous fluid, wherein at least one of pump shaft ascending, descending speed change detection, pressure change after pump outlet detection, or elevator pump descending change detection is detected. The remaining amount of the viscous fluid is detected and the switching is instructed by the output of the detection, and the remaining amount is reduced in the transfer of the viscous fluid. The pressure change after the pump outlet is detected and the change in the descending amount of the elevator pump is detected.

  Further, the invention of the system is a system for supplying viscous fluid, wherein at least one of detection means for detecting a change in pump shaft ascent and descent speed, detection means for detecting a change in pressure after the pump outlet, and detection means for detecting a change in the descending amount of the elevator pump is detected. A system for reducing the remaining amount in the transfer of viscous fluid, characterized by providing a means or a combination of two or three detection means. The detection means of the pressure change after the pump outlet is a pressure sensor attached to the part after the pump outlet, and the detection means of the lowering change of the elevator pump is displaced to the elevator pump. It is detected by attaching a sensor.

  In the above invention, when the viscous fluid in the container is reduced, the pump shaft is caused to change in the upward / downward speed by the idle driving of the pump. Therefore, when the proximity switch is attached to the pump shaft and the speed of the pump shaft rising and falling is detected, the data at normal time and abnormal time are clearly distinguished. By switching the switching valve, the viscous fluid take-out container is switched from the front container to the rear container. In this way, it is possible to store the change most accurately by the simplest method by capturing the change in the transfer amount immediately by detecting the change in movement.

  Further, when the remaining amount of viscous fluid in the front container decreases, a difference in the amount of viscous fluid to be discharged is produced due to the rise and fall of the pump shaft, which appears as a pressure change. Therefore, it can be known that the remaining amount is small by detecting the change in the discharge pressure of the pump.

  The viscous fluid (for example, adhesive) of the invention is used as an adhesive for, for example, a windshield of an automobile, but if the same amount of the same width and the same thickness cannot be applied to the peripheral portion of the windshield, And all adhesives must be homogeneous. For example, if air enters or there is a difference in the supply flow pressure, the coating width or coating thickness is not the same, so there is a risk that watertightness as well as airtightness may be impaired. Therefore, the adhesive sent during the bonding operation must be the same amount, the same pressure, and the same quality.

  However, even if the transfer system is completely controlled, if the amount of adhesive remaining in the container (for example, a drum can) decreases, the balance of the same amount, the same pressure, and the same quality is lost, and as a result, the same amount, Pressure and homogeneity may not be maintained.

  Therefore, the present invention eliminates the change in conditions in the transfer system by switching from an empty container to a full container immediately before the amount of adhesive in the container is reduced and the same amount and pressure cannot be transferred. It is intended to maintain the same pressure and homogeneous conditions.

  In a transfer pump apparatus of the type such as this invention, whenever the amount of remaining adhesive decreases, the pump shaft rises, the speed of lowering changes, the pressure change of the adhesive after the pump outlet, or the lowering amount of the elevator pump. We have learned that changes will occur.

  It is unclear which of the three changes will appear earlier depending on the state of the adhesive remaining in the container, but since it always appears, a means for catching the three changes has been applied, and the fastest change among them. It was revealed that the conditions of the same amount, the same pressure, and the same quality of the viscous fluid can be surely secured by switching the switching valve. That is, the above three changes always appear, but there is a slow speed depending on the state of the bottom of the container (for example, the state of the inner bag in the drum can). Therefore, if the fastest change is dealt with, the normal state is surely maintained at least after the switching valve. However, since the slow difference between the three changes is small, a considerable effect can be expected with only one means.

  For example, the amount of residual adhesive is reduced, and the three sensors detect it when at least the sensor installation position or the sensor that conveys the change (for example, the pump plunger) is abnormal. This is because the amount already transferred (for example, in the transfer pipe on the downstream side of the switching valve) maintained the same amount, the same pressure, and the same quality.

  According to the present invention, when the viscous fluid is transferred, any one (or all) of the pump shaft rising, lowering, speed change, pressure change after the pump outlet, or elevator pump lowering amount is detected. Thus, since the transfer of the viscous fluid from the empty container is stopped and switched to the next container, it is possible to switch immediately before the change in the transfer amount of the viscous fluid or the like. Therefore, the viscous fluid has the same amount, the same pressure, and the same quality, and has an effect that can be switched with the minimum residual amount.

  That is, there is an effect that the residual fluid (waste fluid) can be minimized with no risk of adversely affecting the use state.

  The present invention attaches a proximity switch to the pump shaft portion in order to detect changes in the pump shaft ascending and descending speed in a transfer device that sucks up and pushes the viscous fluid (hereinafter referred to as “adhesive”) in the container. Install a pressure sensor near the pump outlet to measure the adhesive pressure.

  Next, attach a displacement sensor to the elevator pump and monitor the change in the descent amount. The output of each detector is input to a computer, compared with a standard value measured in advance, and when it is detected that the difference is equal to or greater than a set value, the output is switched to a switching valve drive unit. And switch the switching valve from the empty container to a full container and continue to transfer the adhesive.

  An embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. Lift tubes 12 and 12 are erected on a base plate 11 at a predetermined interval, and pistons of the lift tubes 12 and 12 are arranged. The tie bar 14 is fixed to the upper ends of the rods 13 and 13 to constitute an elevator 15 that moves the follower plate 16 up and down. The follower plate 16 is supported on the tie bar 14 by two tie rods 17, 17, and a liquid feeding device 20 such as an air motor 18 and a heated pump 19 is installed between the tie bar 14 and the follower plate 16 ( FIG. 1).

  A bracket 10 is fixed to one side of the tie bar 14, and a displacement sensor 9 is fixed to the bracket 10. For example, an aluminum tape (not shown) is attached to the surface of the lid 12a of the lift tube 12, and the laser beam emitted from the displacement sensor 9 is reflected by the aluminum tape, so that the displacement sensor 9 Is measuring the distance. Therefore, if the measured values are compared, the amount of lowering of the follower plate 16 can be accurately measured, so that any change in the measured values can be immediately detected.

  Next, the proximity switch 2 is attached to the pump shaft 1. In this way, when the residual adhesive in the drum can 3 becomes less than one time, the pump is idled, so that the ascending and descending speed of the pump shaft 1 changes. This change is recognized by the proximity switch 2, and the valve 4 for the empty can is closed by the output thereof, and the valve 5 for the actual can is opened (FIG. 5).

  Further, a pressure sensor 7 is attached to the pump outlet subsequent portion 6. If it does in this way, if the adhesive in a drum can decreases, the pressure of a discharge adhesive will fall. Therefore, automatic switching can be performed by closing the switching valve 4 and opening the valve 5 based on the output signal generated by the pressure drop (FIGS. 3 and 5).

  Each of the three sensors exhibits characteristics. If all or a plurality of sensors are attached and the valve is automatically switched by the first detection of the sensor, the remaining amount of the adhesive can be kept to a minimum. According to the results of the experiment, it was recognized that the amount of residual adhesive was 5 kg or less, which was significantly reduced.

  FIG. 5 is a flowchart of the present invention, and each valve is opened and closed with pressurized air. As shown by arrows 32 and 32a, the adhesive sent out from the drums 3 and 3a passes through the heating Teflon (registered trademark) hoses 33 and 33a, passes through the valve 4 or 5, and passes through the high pressure ball valve 34, It passes through 34a and is sent to a required place by the metering pumps 35 and 35a. In the figure, 2 and 2 are proximity switches.

  In the above, when the adhesive of the drum can 3 becomes empty, it is switched to the drum can 3a so that the supply of the adhesive is not hindered. For example, no. No. 1 drum can 3 is empty, no. No. 2 drum can 3a. When the remaining amount of the adhesive in one drum can decreases, air enters and there is a possibility that the adhesion may be hindered. Therefore, as described above, switching is preferably performed immediately before the air enters. Thus, the present invention has been completed by conducting research to accurately detect the timing immediately before the air enters.

The operation of the heated pump 19 in the above embodiment will be described with reference to FIGS. 4 (a) and 4 (b). When the rod 21 is raised from FIG. (Not shown), the check valve 23 is opened to closed , the rod 24 is raised, and the same amount of material as the volume obtained by subtracting the volume of the rod 24 from the volume of the rod 21 is discharged as indicated by an arrow 25. The When the rod 2 is lowered as indicated by an arrow 22a, the same amount of material as the volume obtained by subtracting the volume of the plunger rod 26 from the volume of the rod 24 enters the lower chamber 27 as indicated by an arrow 28. Check valve 29 in this case is from the open to the closed. Therefore, materials such as adhesive can be intermittently fed by raising and lowering the rods 21 and 24.

  In the above, the rod 21 and the plunger rod 26 move up and down as indicated by arrows 22 and 22a. In the figure, reference numeral 30 denotes a primer plate fixed to the lower end of the plunger rod 26 so as to close the lower surface of the valve seat 31 when the plunger rod 26 is raised.

The front view which abbreviate | omitted a part of Example of this invention and cut off partly. The side view which abbreviate | omitted a part similarly. (A) The figure which similarly shows the attachment of a pressure sensor, (b) The figure which similarly shows the attachment of a displacement sensor. (A) The expanded sectional view which similarly shows pump transfer, (b) The expanded sectional view which similarly shows pump transfer. The flowchart of adhesive removal similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump shaft 2 Proximity switch 3, 3a Drum can 4, 5 Valve 6 Pump outlet subsequent part 7 Pressure sensor 8 Elevator pump 9 Displacement sensor 10 Bracket 11 Base plate 12 Lift tube 13 Piston rod 14 Tie bar 15 Elevator 16 Follower plate 17 Tie rod 18 Air motor 19 Heated pump 20 Liquid feeding device 21, 24 Rod 26 Plunger rod 27 Lower chamber 23, 39 Check valve

Claims (4)

A system for supplying a viscous fluid, the combination increases the pump shaft, and detecting the hand stage of the lowering speed changes, the detection hand stage of the pressure change after the pump outlet and a detection hand stage of descent amount change of lift pump, the three Of the two detection means , the detection means that is activated first detects any change in the lowering amount of the pump, rise of the pump shaft, change in the lowering speed, or change in the pressure after the pump outlet, and based on the detection, remainder reducing system on the transfer switch of the viscous fluid which is characterized in that switches a flow exit path of the viscous fluid from the small became empty container of the viscous fluid to the real vessel. Increase of the pump shaft, the detecting means of a change in descending speed, attach the proximity switch to the pump shaft, increase of the pump shaft, according to claim 1, wherein the viscous fluid, characterized by detection of a change in descending speed Remaining amount reduction system for transfer switching. Detecting means of the pressure change after the pump outlet is fitted with a pressure sensor in the pump outlet later section, remaining on the transfer switch of claim 1, wherein the viscous fluid, characterized in that detecting a change in pressure after the pump outlet Volume reduction system. Detecting means lowering the amount change of the lift pump is fitted with a displacement sensor to lift pump, the remainder reducing the transfer switch of claim 1, wherein the viscous fluid, characterized by detection of a change in the amount of downward movement of the elevator pump system.

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