JP4096109B2 - Pumping device for stored liquid in container - Google Patents

Description

  This invention is mainly used for food materials such as tomato paste and various creams, printing inks, sealants, putty agents, etc., which are stored in a container whose opening cross section is constant in the height direction, such as drums and pail cans. The present invention relates to a pumping device (discharger) including a pump for pumping and transferring a storage liquid such as a viscous liquid or a high viscosity liquid as a main part, and more particularly to a measuring device for the pumping amount (transfer amount).

There are many types of pumping devices of this type, but in order to measure the pumping amount, conventionally, a flow meter such as an electromagnetic flow meter is incorporated in the transfer line on the discharge side of the pump, or as shown in FIG. The pump device 50 including P is placed on the weighing platform balance 51, and the flow rate is obtained from the difference between the measured values at the start of pumping and at the end of pumping. Further, the filling amount of the pumped liquid and the mixing amount of various pumped liquids are automatically controlled and the flow rate is controlled after the flow rate is obtained with the same measuring device as described above.

However, there are the following disadvantages in the measurement or automatic control of the pumping amount by the conventional measuring device. That is,
(B) In addition to the electromagnetic flow meter, there are mass flow type and positive displacement type flow meters that measure the flow rate in the piping line, but there are many restrictions, for example, the viscosity of the liquid to be pumped. If it was too high or low, it could not be used, it was necessary to provide a rectifying part, a flow rate of more than a predetermined speed was required, or it could not be used if slurry was mixed in the transfer liquid.

  (B) When the container P and the pump device 50 are placed on the weighing platform balance 51 and measured, since the platform balance is selected from the weighing of the entire device, the weighing amount becomes too large compared to the pumped amount, and the measurement resolution becomes larger. The minimum resolution unit of the value becomes large and an error is likely to occur.

  (C) In any of the above cases, since a measuring device is required separately from the pumping device, handling is inconvenient.

  The present invention has been made in view of the above points, and in a device that lifts and lowers the follow plate by the lifting device to pump the stored liquid in the container, it is not limited by the properties and flow rate of the stored liquid using a simple device. The purpose of the present invention is to provide a pumping device that can measure the pumping amount accurately at a low cost and that can also automatically control a filling system and a dispensing system.

In order to achieve the above object, an apparatus for pumping a stored liquid in a container (discharger) according to the present invention is a disc-shaped or square attached around a suction port at a lower end of a pump or a lower end of a suction nozzle connected to the pump. A plate-shaped follow plate is provided, inserted into a cylindrical or rectangular tube-shaped container having an open upper end, and the pump is operated while the follow plate is lowered via an elevating device (such as an air cylinder or an electric motor). In the pumping device that sucks up and transfers the stored liquid in the container, the descending distance measuring device of the follow plate, the descending distance per unit time is calculated from the descending distance and the descending time, and the pumping amount is calculated from the opening area of the container. and a calculator for calculating the descending distance measuring equipment available in conjunction unit lowered distance in downward movement of the follower plate at Tonipa The follower plate descending distance is obtained by multiplying the unit descending distance of the follow plate per pulse by the arithmetic unit and the total number of pulses measured, and the container is added to the obtained value. The feature is that the amount of pumping is calculated by multiplying the opening area of each.

According to the apparatus for pumping stored liquid in a container according to the present invention having the above-described configuration, the volume of stored liquid, that is, the pumped amount can be calculated from the opening (cut) area and the descending distance (falling amount) of the container. In particular, in the present invention, since the pumping amount is calculated from the product of the descending distance of the follow plate and the opening (cut) area of the container, there are restrictions on the properties (particularly the viscosity) and the type (whether there are bubbles or slurry) of the stored liquid. I do not receive it. As a result, for example, the filling operation such as transferring or dispensing the stored liquid to another container can be automatically performed, and the operation of mixing a plurality of different types of liquids at a predetermined ratio can also be automatically performed. . In addition, compared to conventional flow meters and platform scales, the components are simpler, can be easily incorporated into a pumping device, and are inexpensive.

According to a second aspect of the present invention, a timer for measuring the descent time of the follow plate is further provided, and the descent time of the follow plate is measured by this timer to obtain a pumping amount (flow rate) per unit time. It is preferable to do so.

According to the pumping device of claim 2, the pumping amount (flow rate) per unit time is obtained by dividing the pumping amount by the descending time from the descending time of the follow plate. Amount) can be calculated. Thereby, the filling operation such as transferring or dispensing the stored liquid to another container can be automatically performed, and the operation of mixing a plurality of different types of liquids at a predetermined ratio can be automatically performed.

According to a third aspect of the present invention, the arithmetic unit is a programmable ladder controller (hereinafter also referred to as a PLC), and includes a display unit such as an LCD or a display / indicator in addition to the programmable ladder controller . An analog signal is converted into a digital signal by an AD converter, and this digital signal is fed back to a motor driver (for example, an inverter) of a pump for pumping stored liquid provided in the lifting device, so that the descending speed of the follow plate and the pumped amount of stored liquid At least one can be controlled.

According to the pumping apparatus of the third aspect, the measurement data from the descending distance measuring device is taken in by the PLC, the descending time is determined by the built-in clock function, and can be immediately converted into the flow rate. In addition to displaying this converted flow rate, it is possible to provide feedback control by inputting an instruction on the LCD, and automatically control the number of rotations of the pump motor for pumping from the converted flow rate by the PLC. The flow rate can be achieved accurately.

As described in claim 4, falling distance measuring device consists of a Rue encoder to generate pulses in accordance with the feeding length of the wire winding device and the wire, lifting to the side members of the pumping device (e.g. The wire take-up device can be attached to a follow plate and one end of the wire can be attached to a non-elevating member (for example, a column or a container mounting table).

Pumping device according to claim 4 consists device simple configuration for measurement of the flow rate, in addition to be in a short time easily assembled to the pumping device, since the measurement based on the number of pulses generated from the encoder For example, the operation of the pumping pump motor can be automatically controlled in combination with a PLC or LCD.

  6. The descending distance measuring device according to claim 5, wherein the descending distance measuring device includes an encoder attached to an electric motor as a lifting device or an encoder built in the electric motor, and the follow plate is lowered based on the rotation speed of the encoder. Distance can be measured.

  According to the pumping device of the fifth aspect, since the rotation amount of the electric motor as the lifting device is directly obtained by the encoder and the descending distance is measured, the preparation of the wire winding device and the work of fixing one end of the wire are saved. It is burned.

  The best mode for carrying out the apparatus for pumping stored liquid in a container according to the present invention will be described below with reference to the drawings.

   FIG. 2 is a left side view showing the pumping device according to the embodiment of the present invention, and shows a state before pumping up the high viscosity liquid in the container. FIG. 3 is a cross-sectional view showing the internal structure of a uniaxial eccentric screw pump incorporated in the pumping device of FIG.

  As shown in FIG. 2, the pumping device 1 includes a vertical uniaxial eccentric screw pump 2 as a main part. The main body 3 of the pump 2 is integrally coupled to the lower end of the pump casing 4 as shown in FIG. The pump body 3 includes a male threaded rotor 6 having a circular cross section and a female threaded stator 5 having an inner hole surface having an elliptical cross section having a pitch twice that of the rotor 6, and the rotor 6 rotates into the stator 5. It is inserted freely. Further, the rotor 6 is connected to a rotating shaft 7a extending downward from a speed reducer 7 integrally connected to the upper end of the pump casing 4 via a connecting rod 7c. The rotation center axis M of the rotor 6 is eccentric with respect to the rotation center axis N of the rotation shaft 7a. For this reason, universal joints 7d are interposed between the rotating shaft 7a and the connecting rod 7c and between the connecting rod 7c and the rotor 6 so as to allow the eccentric rotation of the rotor 6. The pump casing 4 has a structure in which an upper casing 4a and a lower casing 4b are connected to each other, and has a discharge port 4c for connecting a transfer hose (not shown) to the lower casing 4b. In this example, the uniaxial eccentric screw pump 2 is installed on the pump body 3 (pump casing 4, stator 5 and rotor 6), the speed reducer 7 and the upper end thereof, and a drive shaft (not shown) is directly connected to the rotary shaft 7a. It is comprised from the inverter motor 8 for pumps. Further, in the present example, the following follow plate 21 is detachably provided around the suction port 2 a at the lower end of the stator 5. In this example, the follow plate 21 is a disc having an outer diameter that can be inserted into a cylindrical container (for example, a drum can) P having an open upper end, and is attached and detached by rotating the lever 22 in a specific direction.

  As shown in FIG. 2, the uniaxial eccentric screw pump 2 is movable up and down along a column 31 erected on a pedestal 33 via an inverted “J” shaped arm (pump mount) 32 as viewed from the side. It is supported. That is, the upper end of the speed reducer 7 of the pump 2 is connected to one lower end of the arm 32. The support column 31 has a hollow structure, and the front surface is open over almost the entire length. A slide rail 34 is arranged in the vertical direction at the center of the support column 31. A slide guide 35 is mounted so as to be movable up and down along the slide rail 34. A pair of plate-like support members 36 and 36 are vertically fixed to the slide guide 35 with a vertical interval therebetween. A fixed plate 37 is fixed in the vertical direction across the support members 36 and 36, and the lower surface of the lower end of the rear arm 32 is fixed to the fixed plate 37. Further, sprockets 38 and 39 are rotatably supported above and below the slide rail 34 in the support column 31, respectively. A chain 40 is stretched over the upper and lower sprockets 38 and 39, and both ends of the chain 40 are connected to the upper and lower ends of the shaft 41. An elevating motor 9 is attached to the upper end portion of the column 31, and the drive shaft of the motor 9 is directly connected to the rotation shaft of the sprocket 38 to drive the sprocket 38 to rotate.

  In the pumping device 1 having the above-described configuration, an embodiment of a measuring device 10 for measuring the pumping flow rate will be described with reference to FIG.

FIG. 1 is an explanatory view schematically showing an embodiment of the flow rate measuring device 10. As shown in the figure, the main part (falling distance measuring device) of the flow rate measuring device 10 of this example includes a wire take-up device 11 in which a take-up reel (not shown) is rotatably incorporated, and a wire 11a being fed out. a rotor Rie encoder 12 for generating a pulse depending on the length, and a locking ring 13 which is attached to one end of the wire 11a. Then, the wire winder 11 with the rotor Rie encoder 12, the lift sides of members, for example, mounted so as to lift integrally with the lower end portion of the arm 32, attachment ring 13 at the other end of the wire 11a is struts 31 is fixed to the upper end.

The flow rate measuring apparatus 10 includes a LCD15 as PLC 14 and display and indicator as an operator with a built-in timer, the number of pulses from the rotor Rie encoder 12 is input to the PLC 14, the display in the display window of the LCD15 Are connected in this order as shown in FIG. Further, an instruction signal from the LCD 15 is output to the pump inverter motor 8 via the PLC 14, and an output signal from the PLC 14 is further sent to the AD converter 16 for A / D conversion, and as a digital signal, the pump inverter motor 8 Connected to be fed back.

Next, the operation of the measurement flow rate device 10 will be described in detail in the pumping device 1 of the present example having the above configuration. In FIG.
1. The follower plate 21 is moved down together with the arm 32 by the rotation of the elevating motor 9, and the follower plate 21 is inserted into the container P while being attached to the lower end of the pump 2 and is seated on the upper surface of the stored liquid in the container P. In this state, the outer peripheral edge portion (annular seal portion) of the follow plate 21 is brought into close contact with the inner peripheral wall of the container P and sealed.

  2. When the pump driving motor 8 is activated and the operation of the pump 2 is started, the stored liquid in the container P is pumped out, and the follow plate 21 is lowered at a constant speed as the stored liquid level is lowered. In this state, the wire 11 a is fed out from the wire winder 11, and a pulse number signal generated from the encoder 12 is input to the PLC 14. The encoder 12 of this example generates, for example, 10 pulses every time the wire 11a is fed 1 mm. Note that a higher resolution encoder may be used, and the present invention is not limited to this example.

Here, when the encoder 12 generates 10 pulses every time the wire 11a is fed out by 1 mm, the PLC 14 calculates the opening cross-sectional area A (πd2 / 4 = πr2) from the inner diameter d of the container P, and the total number of pulses α Is the descending distance h (0.1 × α / 10), the descent time tsec is further determined by the built-in timer, and the flow rate v = A × h × 60 / t = (πd 2/4) × (0.1 × α / 10) × 60 ÷ t (cc / min) = 0.15απd 2 / t (cc / min).

  3. In this way, the flow rate v of the stored liquid pumped from the container P is calculated. In this example, if the desired flow rate V is instructed by the LCD 15, for example, the rotational speed corresponding to the flow rate V is the pump inverter. It is output to the motor 8. Then, the calculated current flow rate v and the flow rate V are compared, and if there is a difference between both flow rates, the rotation speed correction signal is passed through the AD converter 16 and the inverter motor 8 so that this difference becomes zero. And the rotational speed of the inverter motor 8 is automatically controlled.

  4). As described above, the operation of pumping the stored liquid by the pump 2 is continued, and when the follow plate 21 reaches the bottom surface in the container P, this state is detected by a sensor (not shown) and the discharge operation is completed.

  FIG. 4 is a right side view showing a pumping device 1 ′ according to the second embodiment of the present invention. In this embodiment, the uniaxial eccentric screw pump 2 is moved along the column 31 via a bracket 23 having a right triangle when viewed from the side. The uniaxial eccentric screw pump 2 is moved up and down by the expansion and contraction of the air cylinder 24. In this example, the wire winder 11 is fixed to the upper end portion of the column 31, and one end of the wire 11 a is fixed to the bracket 23 by the fixing ring 13. Since other configurations are common to the above-described embodiment, common members are denoted by the same reference numerals in the drawings and description thereof is omitted.

In addition, although illustration is abbreviate | omitted, the bracket 23 can also be comprised so that raising / lowering along the support | pillar 31 is possible via the nut screwed together with a screw rod by rotating the vertical screw rod with an electric motor. In this case, the flow rate can also be calculated by attaching a rotary encoder to the electric motor or using a motor with a built-in encoder, and obtaining the descending distance from the number of revolutions of the encoder. This eliminates the need for the wire winder 11, eliminates the need for attaching one end of the wire 11a to an appropriate member, and simplifies the structure.

  FIG. 5 is a front view showing a pumping device 1 ″ according to Embodiment 3 of the present invention. The top horizontal portion 26a of a portal lifting device 26 having a pair of air cylinders 27, 27 on the left and right on a base 25 with casters 25a. The uniaxial eccentric screw pump 2 is suspended at the center of the shaft and the follow plate 21 is moved up and down. In this pumping device 1 ″, the wire winder 11 is moved by the expansion and contraction of the piston rod 27a of the air cylinders 27 and 27. It is attached to one end of the upper end horizontal portion 26a that moves up and down, and one end of the wire 11a is fixed to the lower part of one (the wire winder 11 side) air cylinder 26 by a fixing ring 13. The upper end of the piston rod 27a is integrally fixed to both ends of the upper end horizontal portion 26a. Since other configurations are the same as those in the above embodiment, common members are denoted by the same reference numerals in the drawings, and description thereof is omitted.

  Although three embodiments relating to the pumping device of the present invention have been described above, the present invention can also be implemented as follows.

  In each of the above-described embodiments, the wire winder 11 with the encoder 12 is used as the descending distance measuring device for the follow plate 21 (pump 2). However, the present invention is not limited to this. For example, the roller can be rotated to the pump 2 side. The rotor may be attached to a non-elevating member such as a side surface of the support 31 and the roller may rotate as the pump 2 moves up and down to generate a pulse from an encoder that rotates integrally with the roller.

  The follow plate 21 can be changed from a circular shape to an elliptical shape or a rectangular shape according to the shape of the container P, and the same can be applied to these cases.

  In the above embodiment, the follower plate 21 is attached to the lower end of the vertical uniaxial eccentric screw pump 2, but the seal structure of the follower plate 21 and the type of the pump 2 are not limited. A pump or a plunger pump may be used.

It is explanatory drawing which shows roughly the Example of the flow measuring device 10 applied to the pumping-up apparatus of this invention. It is the left view which shows the pumping apparatus which concerns on the Example of this invention, and the inside of the support | pillar 31 is notched and represented. It is sectional drawing which shows the internal structure of the uniaxial eccentric screw pump integrated in the pumping apparatus of FIG. It is a right view which shows the pumping apparatus 1 'which concerns on Example 2 of this invention. It is a front view which shows the pumping apparatus 1 "which concerns on Example 3 of this invention. It is a perspective view which shows roughly the measurement aspect of the conventional general pumping amount.

Explanation of symbols

1, 1 ', 1 "pumping device (discharger)
2 Vertical Uniaxial Eccentric Screw Pump 4 Pump Casing 5 Stator 6 Rotor 7 Reducer 8 Pump INV Motor 9 Lifting INV Motor 10 Flow Measuring Device 11 Wire Winder 11a Wire 12 Rotary Encoder 13 Fixing Ring 14 Programmable Ladder Controller ( PLC)
15 LCD (Display / Indicator)
16 AD converter 21 Follow plate 31 Post 32 Arm 34 Slide rail 35 Slide guide

Claims (5)

A disc-shaped or square-plate follow plate attached around the suction port at the lower end of the pump or the suction nozzle connected to the pump is inserted into a cylindrical or rectangular tube-shaped container with an open upper end. In a pumping device that operates the pump while lowering the follow plate via a lifting device and sucks and transfers the stored liquid in the container,
A descent distance measuring device for the follow plate, and a calculator for calculating a descent distance per unit time from the descent distance and descent time, and calculating a pumping amount from the opening area of the container,
The descending distance measuring device generates a pulse for each unit descending distance in conjunction with the descending operation of the follow plate, and the arithmetic unit calculates the unit descending distance of the follow plate per pulse and the total number of pulses measured. An apparatus for pumping a stored liquid in a container, wherein the descending distance of the follow plate is obtained by multiplying and the amount of pumping is obtained by multiplying the obtained value by the opening area of the container. The timer for measuring the descent time of the follow plate is provided, the descent time of the follow plate is measured by this timer , and the pumping amount per unit time is obtained. A device for pumping the liquid stored in the container. The arithmetic unit is a programmable ladder controller, and in addition to the programmable ladder controller, a display device such as an LCD or a display / indicator is provided.
An analog signal from the programmable ladder controller is converted into a digital signal by an AD converter, and this digital signal is fed back to a motor driver of a pump for pumping a stored liquid provided in the lifting device, and a descending speed of the follow plate and a stored liquid The apparatus for pumping stored liquid in a container according to claim 1 or 2 , wherein at least one of the pumping amounts is controlled .   The descending distance measuring device includes a wire winding device and an encoder that generates a pulse according to the wire feeding length, and the wire winding device is attached to a member that moves up and down of the pumping device. The apparatus for pumping stored liquid in a container according to any one of claims 1 to 3, wherein one end of the wire is attached to the member.   4. The descending distance measuring device comprises an encoder attached to an electric motor as a lifting device or an encoder built in the electric motor, and measures the descending distance of the follow plate based on the number of rotations of the encoder. The apparatus for pumping stored liquid in a container according to any one of the above.

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