JPH0745871B2 - Pump control method for high viscosity materials - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for controlling a high-viscosity material pump for transferring a high-viscosity material such as jelly to be filled in a communication cable to a tank of the filling machine. Is.

(Prior Art) Conventionally, in order to transfer such a high-viscosity material from the storage can to the tank of the filling machine, the high-viscosity material in the storage can is put in a heating chamber and heated to lower the viscosity of the high-viscosity material and to be semi-solid. After melting the container, it was taken out of the heating chamber and transferred to the tank by a pump. However, in this method, since the high-viscosity material was heated together with the storage canister, a considerable heating time was required, which required a large amount of work time and electric power. Therefore, the discharge amount per unit time was small, and the heating chamber It was uneconomical as a whole because it required such large facilities.

(Object of the Invention) An object of the present invention is to provide a method for controlling a high-viscosity material pump capable of economically transferring a high-viscosity material without requiring a large facility in addition to requiring a short working time and a small electric power. To provide.

(Structure of the Invention) A method for controlling a pump for high-viscosity material according to the present invention is such that, when a high-viscosity material is transferred from a storage can to a tank of a material filling machine, the storage can retains the high-viscosity material inside the storage can. A plate having a main heater in contact with the upper surface is communicated with a tank via a transfer pipe to lower the plate so that the main heater is in close contact with the upper surface of the high-viscosity material and drive a pump to transfer the high-viscosity material. In the transfer preparation stage, the temperature of the plate is detected to control the main heater, and when the pump is driven, the temperature of the high-viscosity material is detected to control the main heater.

In this way, since the high-viscosity material is in direct contact with the main heater, the heating time is shortened and the transfer can be started immediately so that the discharge amount per unit time can be significantly increased. Since it does not require a heating room, the facility cost is low and it is economical overall.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a control method of a pump for high viscosity material according to the present invention, in which a high viscosity material 10 such as a jelly for communication cable is used. When transferring from the storage can 12 such as the stored drum can to the tank (not shown) of the material filling machine by the pump 14, the storage can
12 communicates with the tank from a plate 18 having a main heater 16 that contacts the upper surface 10a of the high-viscosity material 10 therein via a transfer pipe 20. The plate 18 is connected to the piston rod 22a of the lifting air cylinder 22 via the connecting member 24 and the transfer pipe 20.
The main heater 16 is lowered so as to be in close contact with the upper surface 10a of the high-viscosity material 10 by being connected to. Therefore, pump 14
The main heater 16 is always brought into close contact with the high-viscosity material 10 and heated when the high-viscosity material 10 is transferred by driving the. In the air cylinder 22, air is sucked and discharged from an air supply source (not shown) via a pressure regulator 26 and a lifting valve 28. Also, the pump
Around the transfer pipe 20 and the transfer pipe 20, a spirally wound auxiliary heater 30 is provided to heat the remaining high-viscosity material that has been transferred before and lowers the viscosity.
In FIG. 1, reference numeral 32 is provided so as to penetrate the plate 18 so as to remove air between the plate 18 and the high-viscosity material 10 so that the heater 16 adheres to the high-viscosity material 10 in a vacuum state. This is an air bleeding valve, and an auxiliary heater 30 'is also provided around it. Reference numerals 34A and 34B are limit switches for the upper limit and the lower limit of the plate 18.

In the method of the present invention, the temperature Pt of the plate 18 and the temperature Mt of the high-viscosity material 10 are detected by temperature sensors 36 and 38 such as thermocouples attached to the plate 18, respectively. The main heater 16 is controlled accordingly.
When driving the pump, the main heater 16 is controlled by the temperature Mt of the high viscosity material. The transfer pipe 20 is provided with a temperature sensor 40 such as a thermocouple for detecting its temperature Tt.

Next, a specific control circuit for performing the control will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, the main heater 16 includes an AC power source 42, a safety device 44, and a relay contact r to be provided later.
Power is supplied via 1 and the thyristor control unit 46.
The pump 14 is also driven from the AC power source 42 'via a relay contact r5 which will be described later. The thyristor control unit 46 receives the outputs Pt and Mt of the temperature sensors 36 and 38,
For example, they are connected to temperature controllers 48 and 50 for controlling 110 ° C. and 50 ° C., respectively, via relay contacts r6 and r7 which will be described later. A temperature indicator 51 is connected to the temperature controller 50. The auxiliary heater 30 is connected to the AC power supply 42 via the relay contact rh of the relay RH, and the relay RH is connected to the temperature controller 52 that receives the output Tt of the temperature sensor 40 and controls the temperature to a set temperature, for example, 80 ° C. There is.

The relay circuit 54 is shown in FIG. 3, which comprises a cylinder operating switch CS1, a ready button switch Pb1, a start button switch Pb3 and stop button switches Pb2, Pb4, which are respectively relays R1 to R8 and The contacts r1 to r8, the timer T5 and its contact t5, the cylinder lower limit switch 34B, and the temperature setting relays RY1 and RY2, which are energized when the temperature setters 48 and 50 reach the set temperature, ry1 and ry2, the air It cooperates with the valve switch LSS and the cylinder lower limit switch 34B that close in response to the closing of the extraction valve 32.

Next, the method of the present invention will be described more specifically together with the above control circuit. First, the cylinder operation switch CS1 is set to the down side to contract the piston rod 22a of the lifting air cylinder 22, and the air cylinder 22 is pressed against the high-viscosity material 10 at the pressure set by the pressure regulator 26. To do. At this time, the air between the heater 16 and the high-viscosity material 10 is removed by the air vent valve 32.
Emitted from. Next, when the air bleeding valve 32 is closed, the valve switch LSS is closed. Next, prepare button switch P
When b1 is pressed and closed, relay R1 is energized and relay contact
Since r1 is closed, relay R6 is energized and relay contact r6 is closed, so that temperature controller 48 is connected to thyristor control unit 46. Therefore, the main heater 16 has its set temperature, for example, 11
It is energized until the temperature rises to 0 ° C. At this time, the main heater 16
Since the temperature is controlled by detecting the temperature of the plate 18, even if there is a gap between the main heater 16 and the high-viscosity material 10 due to a delay in the lowering of the air cylinder 22, no air baking occurs. In this way, the main heater 16 is at the set temperature of 110 ° C.
Then, the relay RY1 is energized and the relay R2 is energized, so that the relay contact r2 is closed. This is one of the pump starting conditions as will be described later. High viscosity material at this point
10 is in a liquid state in the portion close to the main heater 16, and its temperature is displayed on the temperature display 51. Since the high-viscosity material 10 has a very poor thermal conductivity, the temperature is 110 ° C. in the portion close to the heater 16, but is 60 to 70 ° C. in the other portion.

On the other hand, since the relay contact r1 is closed, the auxiliary heater 30 is connected to the AC power supply 42 and is energized. The auxiliary heater 30 serves to keep the pump 14 and the transfer pipe 20 warm and to melt the high-viscosity material 10 accumulated inside when the operation of the apparatus is stopped. In this way, the auxiliary heater 30 becomes the temperature controller 52.
When the set temperature of, for example, 80 ° C. is reached, the relay RY2 is energized, so the relay R3 is energized and its contact r3 is closed. This is also one of the pump starting conditions.

If the two conditions are satisfied in this way, the relay contact
Since r8 and r2 are already closed, and the air bleeding valve 32 is closed and the valve contact LSS is already closed, the relay R4 is energized. The fact that the starting conditions are satisfied in this way is indicated by the lighting of the pilot lamp PL4. Therefore, when the start button switch Pb3 is pressed, the relay R
5 is energized to close relay contact r5 and pump 14 is activated. Further, when the timer T5 is started at this time, the set time of the timer T5 is set to, for example, 2 minutes, which is the time for which the sufficiently melted high-viscosity material 10 is transferred to the tank by the pump 14. During this time, since the lifting cylinder 22 is urged to the lower side, the cylinder 22 moves down according to the transfer of the high-viscosity material 10. In addition, since the high-viscosity material has poor thermal conductivity, its temperature drops to, for example, 40 ° C. After this 2 minutes, the contact t5 is closed and the relay R7 is energized, so that the contact r7 is closed and the relay contact r7 on the relay R6 side is opened, the relay R6 is deenergized, and the relay contact r6 is opened and the temperature is increased. The regulator switches from 48 to 50. Therefore, the main heater 16 thereafter detects the temperature of the high-viscosity material 10 and adjusts the temperature, so that the melting speed becomes faster and the discharge amount, that is, the transfer amount increases. When all high-viscosity materials 10 have been transferred and the storage can 12 has become empty,
Cylinder lower limit switch 34B opens so relay R5,
When R7 is de-energized and the pump 14 is stopped, the main heater 16 is switched to the control of the temperature controller 48 to prevent firing. In order to stop the operation of the device, the stop button switches Pb2 and Pb4 may be pressed.

(Effect of the Invention) According to the present invention, as described above, since the high-viscosity material is in direct contact with the heater, the heating time is shortened and the transfer can be started immediately. Therefore, the discharge amount per unit time can be reduced. The cost can be significantly increased, and since the conventional heating chamber is not required, the equipment cost is low and the overall economy is achieved. Further, since the main heater is adjusted by detecting the plate temperature in the preparation stage, even if there is a gap between the main heater and the high-viscosity material due to a delay in the lowering of the lifting cylinder, there is no danger of being burned out. Can work on.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an apparatus for carrying out a method for controlling a pump for high viscosity material according to the present invention, FIG. 2 is a system diagram of a drive circuit for a main heater, an auxiliary heater and a pump, and FIG. It is a system diagram of a relay circuit used for the drive circuit of the figure. 10 …… High viscosity material, 12 …… Storage can, 14 …… Pump, 16 ……
Main heater, 18 ... Plate, 20 ... Transfer pipe, 22 ... Lifting cylinder, 30 ... Auxiliary heater, 32 ... Air bleed valve, 34A, 34B ... Cylinder upper and lower limit switch, 36, 3
8,40 …… Temperature sensor, 48,50,52 …… Temperature controller, 54 …… Relay circuit.

Claims (3)

[Claims] 1. A method of controlling a pump for transferring a high-viscosity material from a storage can to a tank of a material filling machine, wherein the storage can has a plate having a main heater in contact with an upper surface of the high-viscosity material. The main heater is communicated with the tank through the transfer pipe, the main heater is moved downward so that the main heater is in close contact with the upper surface of the high-viscosity material, and the pump is driven to transfer the high-viscosity material. In the preparatory stage, the temperature of the plate is detected to control the main heater, and when the pump is driven, the temperature of the high viscosity material is detected to control the main heater. Control method. 2. The method for controlling a pump for high viscosity material according to claim 1, wherein the plate is provided with an air vent valve, and the air vent valve is closed when the pump is driven. 3. A pump for high viscosity material according to claim 1 or 2, wherein the transfer pipe and the pump are heated by an auxiliary heater, and the auxiliary heater is energized when the pump is driven. Method.