KR100918594B1 - Electric metering pump apparatus - Google Patents

Abstract

According to the present invention, in the liquid discharge pump device for measuring and discharging mucus, a liquid discharge pump (4) having a metering block (16) and a valve control block (18) is fastened and fixed to the front surface of the stand (2). A transfer guide 6 is mounted to guide the chamber rod 14 operating in the weighing cylinder 34 of the 16 to be linearly conveyed. And a chamber rod driving part 8 for driving the chamber rod 14 to linearly move, and the stand 2 controls the valve control block 18 to be pneumatically operated and drives the drive motor 80. The controller 10 for controlling is mounted and communicates with the metering cylinder 34 in the metering block 16 and moves the metering cylinder 34 to the mucus inlet 20 according to the pneumatic operation of the valve control block 18. And a conversion valve 42 which operates to selectively form a passage through the discharge port 22.

Liquid Discharge Pump, Metering Chamber, Chamber Rod, Electric, Drive Motor

Description

Electric Liquid Discharge Pump System {ELECTRIC METERING PUMP APPARATUS}

The present invention relates to a liquid discharge pump apparatus, and more particularly, to a liquid discharge pump apparatus that can accurately discharge the desired amount of liquid by controlling the motor position in an electrical manner with a pneumatic valve.

Many devices for quantitatively discharging liquids from low to high viscosity, such as oils, adhesives, and chemicals, have been developed, and there are a number of related applications and registered patent technologies of quantitative discharge valves developed by the present applicant.

In the fixed quantity discharge device which has a fixed quantity discharge valve which discharges a fixed quantity, most technologies are implemented by pneumatic type. However, pneumatics have the following disadvantages.

First, the pneumatic formula is that although the quantitative discharge is possible, the discharge amount does not remain constant during continuous discharge. This is because even though a constant internal pressure is applied to the pump for the discharge, the discharge amount is not kept constant due to factors such as the frictional force and load of the cylinder inner wall, the seal, the packing, and the like. Second, the pneumatic type does not properly produce the various discharge rates desired by the operator. Third, only the start and end of the discharge amount can be known by the pneumatic method, but not the intermediate state. Lastly, only one discharge pressure can be set by the pneumatic type, and the set discharge pressure cannot be changed in the middle of the discharge.

Therefore, there is a need for a discharge pump apparatus that can solve the disadvantages or problems of the pneumatic type described above.

Accordingly, an object of the present invention is to provide an electric liquid discharge pump device that can maintain a constant discharge amount during the quantitative discharge of the liquid from low viscosity to high viscosity and to change the discharge pressure during the discharge.

Another object of the present invention is to provide a tourmaline liquid discharging pump device to prevent the discharge liquid from leaking due to the residual discharging pressure during the quantitative discharging of the liquid from low viscosity to high viscosity.

The present invention for achieving the above object, in the liquid discharge pump device for slime metering and discharging, the liquid discharge pump (4) having a metering block 16 and the valve control block 18 on the front surface of the stand (2) ) Is fastened and fixed, and a transfer guide 6 for guiding the linear movement of the chamber rod 14 operating in the weighing chamber 34 of the weighing block 16 is mounted. It comprises a possible drive motor 80 and is configured to be equipped with a chamber rod driving unit 8 for driving the chamber rod 14 to move linearly, the stand (2) controls the valve control block 18 to be pneumatically operated And a controller 10 for controlling the driving of the drive motor 80. The controller 10 communicates with the metering cylinder 34 in the metering block 16 and according to the pneumatic operation of the valve control block 18. Selectively passage chamber 34 to inlet 20 and outlet 22 of mucus It characterized in that the internal configuration of the inversion valve 42 that allows operability.

The present invention makes it possible to accurately discharge the desired amount of liquid by controlling the motor position in an electrical manner with a pneumatic valve. In addition, it is possible to continuously maintain a constant discharge amount when quantitatively discharging the liquid from low viscosity to high viscosity, and there is an advantage of changing the discharge pressure during discharge.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of the electric liquid discharge pump device (A) of the present invention, Figure 2 is a partially exploded perspective view of the electric liquid discharge pump device (A) of the present invention, Figure 3 is a side and rear perspective view of FIG. 4 is a side cross-sectional view of the electric liquid discharge pump device A of FIG. 1, FIG. 5 is an exploded perspective view of the liquid discharge pump 4 of FIG. 1, and FIGS. 6 and 7 show the liquid discharge pump 4. It is a cross section of.

The electric liquid discharge pump device (A) of the present invention is a device for metering and pumping a liquid having a viscosity from low to high viscosity (hereinafter referred to as "slime"), and the metering pumping mucus includes oil, grease oil, adhesive, Chemical mucus etc.

Metering pumping in the electric liquid discharge pump device (A) of the present invention is implemented to be controlled electrically, valve control for the inflow and discharge of mucus is implemented to be carried out pneumatically.

As shown in FIG. 1, the electric liquid discharge pump device A includes a liquid discharge pump 4 having a metering block 16 and a valve control block 18 fastened to the front surface of the stand 2, and fixed to the metering block ( A conveyance guide 6 for guiding linearly conveying the chamber rod 14 operating in the metering cylinder 34 of FIG. 16 is mounted. In addition, the stand upper support portion 12 is equipped with a controller 10 for controlling the overall operation of the electric liquid discharge pump device (A), the chamber rod operating in the metering chamber 34 in the rear portion of the stand (2) A chamber rod driving unit 8 for driving 14 to be linearly moved under the control of the controller 10 is mounted.

The liquid discharge pump 4 installed in the front part of the stand 2 has a metering block 16 for discharging and discharging the slime and allowing the slime to flow into the metering block 16 through the inlet 20. And a valve control block 18 which causes the metered slime measured in block 16 to be discharged through the discharge port 22.

The weighing block 16 is inserted into the through hole of the fixing stand 32 in the front part of the stand 2, and then the sealing and nut fastening are fixed with the seal holder 35 and the lock nut 33, and the weighing cylinder chamber in the weighing block 16 ( The uppermost joint ball 30 of the chamber rod 14 operating in the 34 is inserted into the front locking groove 28 of the joint 26 connecting through the front portion and the rear portion of the stand 2 to be locked. The joint 26 is configured such that the rear side is coupled to the screw nut part 24 located at the rear part of the stand 2, and the leading side thereof is coupled to the transfer guide 6 located at the front part of the stand 2. The chamber rod 14 is moved up and down in the metering cylinder 34 according to the lifting and lowering of the screw nut 24 and the linear guide of the transfer guide 6.

12 shows a perspective view of relevant parts of the joint 26 and the transfer guide 6.

Referring to FIG. 12, the joint 26 connecting through the front and rear surfaces of the stand 2 is formed to have a somewhat deeper guide groove structure having the locking groove 28 at the front end thereof with a locking step inwardly, and a weighing block. The joint ball 30 of the chamber rod 14 of the 16 is inserted into the locking groove 28 of the joint 26 so as to be hooked to the locking jaw. In addition, the fastening guide grooves 29 formed on the left and right ends of the joint ball 30 to be bolted to the guide plate body 6a of the transfer guide 6 are formed in a somewhat deeper structure with a guide groove structure similar to the locking groove 36. , Since the fixing stand 32 for fixing the metering block 16 is also a bolted structure, it is easy to replace and fasten several types of metering blocks 16 having different measuring capacities or sizes. At this time, the chamber rod 14 of the different sized weighing block 16 is fastened by the joint ball 30 is adaptively positioned in the engaging groove 28 by the fastening structure as described above, the weighing block 16 It is possible to operate up and down linearly without deviation in the inner metering cylinder 34.

Referring again to FIGS. 1 to 7, the chamber rod 14 is configured to be operated up and down in the metering cylinder 34 in the metering block 16, and the narrow inner passage 37 of the metering chamber 34 is provided. In the lower part, a conversion valve 42 composed of a joint pipe 36 made of a synthetic resin material, a valve rotating body 38, and left and right packing support members 40a and 40b is incorporated, and left and right fastening pieces outside the metering block 16 are embedded therein. (44a) (44b) is configured to be fastened and fixed.

5 to 9, the coupling body 36 made of a synthetic resin material having through holes 36a, 36c, and 36b formed up and down and forward of the conversion valve 42 is provided with a conversion valve. It is configured to fit in the ball, the upper through hole (36a) of the coupling pipe 36 communicates with the inner passage (37) of the metering cylinder 34 and the front through hole (36b) is the inlet 20 of the metering block (16) ) And the downward through hole (36c) is configured to communicate with the discharge port 22 of the metering block (16).

The valve rotating body 38 having a three-way passage 39 having a "┴" shape is inserted in the state in which the coupling pipe 26 of the conversion valve 42 is inserted into the conversion valve installation hole of the metering block 16. The left and right packing support members 40a and 40b are fitted to each other and then fastened to the left and right fastening pieces 44a and 44b to assemble the conversion valve 42.

In the slime inflow state, the valve rotating body 38 of the conversion valve 42 is rotationally controlled in the form of " ┴ " as shown in Fig. 8, so that the inner passage of the metering cylinder 34 (37) and the upper through hole (36a) of the coupling pipe 36, the front through hole (36b) and the inlet of the coupling pipe 36 through the "┛" -shaped passage of the through passage 39 in the valve rotating body 38 The valve state is maintained in communication with (20). Accordingly, as the external slime is shown in the main sectional side view of FIG. 8, the inlet 20, the passage 39 of the valve rotating body 38 communicated in a “┛” shape, and the inner passage of the metering cylinder 34. It is injected into the metering cylinder 34 through 37.

In addition, in the slime discharged state, the valve rotating body 38 of the conversion valve 42 is controlled to rotate in the form of " ├ " as shown in Fig. 9, so that the metering cylinder 34 The upper passage 36a of the inner passage 37 and the coupling tube 36 is connected to the lower passage 36c of the coupling tube 36 via the “z” -shaped passage of the through passage 39 in the valve rotating body 38. The valve state is maintained in communication with the discharge port 22. As a result, the quantified slime in the metering cylinder 34 passes through the inner passage 37 of the metering cylinder 34, the valve rotating body 38 communicating in a "┃" shape, as shown in the main part side view of FIG. 9. It is discharged to the outside through the furnace 39 and the discharge port 22.

The valve rotating body 38 of the conversion valve 42 is coupled to the gear rotating body 76 of the valve control block 18 mounted on the lower side of the metering block 36 to rotate.

The valve control block 18 is a configuration in which the upper pneumatic cylinder block 50 and the lower operation block 52 are tightly coupled up and down. In the upper pneumatic cylinder block 50, a piston 60 having a rack portion 58 formed under the rod 56 is inserted into the operation chamber 54 in the pneumatic cylinder block 50 and the lower part of the operation chamber 54. Is communicated to the external liquid inlet air inlet 66, the upper portion of the pneumatic cylinder block 50 has a cover portion 64 having a liquid discharge air inlet 62 in communication with the operation chamber 54 is tightly coupled Is fastened.

The actuating block 52 below the pneumatic cylinder block 50 has a rod actuating groove 70 in which the rod 56 of the piston 60 in the pneumatic cylinder block 50 is interpolated and operated up and down and the rod actuating groove 70. The rotating body working groove 72 is formed in communication with the vertical is formed. The gear rotating body 76 in which the pinion gear 74 is integrally inserted is inserted into the rotating body operating groove 72 of the operating block 52, and the pneumatic cylinder block 50 is inserted into the rod operating groove 70 of the operating block 52. As the rod 56 of) is inserted, the rack portion 58 of the piston 60 and the pinion gear 74 of the gear rotating body 76 are gear-connected. Therefore, when the rod 56 of the pneumatic cylinder block 50 is moved up and down by the piston movement by selective pneumatic injection, the gear rotating body 76 of the operation block 52 rotates clockwise or counterclockwise so that the weighing block 16 The valve rotating body 38 of) is operated.

Meanwhile, as shown in FIGS. 3 and 4, the chamber rod driving unit 8 for controlling linear reciprocation of the chamber rod 14 of the liquid discharge pump 4 installed at the rear surface of the stand 2 is driven motor 80. ), A speed reducer 82, a coupling 84, a ball screw 86, and a screw nut part 24. The ball screw 86 is mandrel rotatably installed on the shaft bearings of the upper and lower support parts 88 and 90, and the ball screw 86 is coupled with a joint 26 connecting the front part and the rear part of the stand 2. The screw nut part 24 is screwed. The lower and upper limit sensors (S1 and S2 of FIG. 10) for detecting the lower limit and the upper limit of the screw nut part 24 which are linearly moved are provided on the lower and upper sides of the ball screw 86. Therefore, when the ball screw 86 is axially rotated by the operation of the drive motor 80, the screw nut part 24 screwed to the ball screw 86 is moved up and down, and thus the joint coupled to the screw nut part 24 is operated. The chamber rod 14 of the metering block 16 suspended from 26 is moved up and down.

 The metering block 16 according to the embodiment of the present invention has a very simple structure in which only the chamber rod 14 operates through electrical control and is discharged through the discharge port 22 when a constant internal pressure is applied by the chamber rod 14. The mucus is consistently consistent.

In addition, the metering pumping in the electric liquid discharge pump device (A) of the present invention is implemented as an electric using the drive motor 80, so that the operator can properly achieve a variety of discharge rate, the discharge amount can be known even in the middle of the discharge process In addition, the preset discharge pressure can be changed in the middle of the discharge.

10 is a block diagram of the electric circuit unit 120 of the electric liquid discharge pump device (A) of the present invention, the metering pumping is performed electrically.

In the electric circuit unit 120, the operation panel 104, the motor driving unit 114, and the solenoid driving unit 110 having the control unit 100, the memory unit 102, the input unit 106, and the display unit 108 are connected to the stand 2. Corresponding to the controller 10 mounted on the upper support 12 of the), the drive motor 80 and the reducer 82 connected to the motor driving unit 114 is mounted on the rear portion of the stand (2). And the solenoid pneumatic valve 112 connected to the solenoid drive unit 110 is the air for liquid discharge of the valve control block 18 shown in Figs. 1 and 2, 4 and 5 according to the drive control of the solenoid drive unit 110. One of the inlet port 62 and the liquid inlet air inlet port 66 is a valve to allow compressed air to be introduced therein.

The driving motor 80 employed in the embodiment of the present invention is a motor capable of forward rotation and reverse rotation, and may use a brushless direct current (BLDC) motor, a servo motor, a stepping motor, and the like. Since the encoder 116 mounted on the driving motor 80 detects a pulse generated when the driving motor 80 rotates and applies it to the controller 100, the controller 100 rotates and rotates the driving motor 80. It allows you to detect the location.

Of the circuit blocks corresponding to the controller 10 in the electric circuit unit 120, the control unit 100 controls each unit for precise metering pumping. In particular, the control unit 100 controls the operator to input the sequence program through the input unit 106 of the operation panel 104 in order to control the pumping pump according to the needs of the operator. The memory unit 102 maps operation programs for slime measurement and inflow and discharge control. In addition, the memory unit 102 stores the operator programming sequence program input by the operator under the control of the control unit 100, and stores various other data.

The lower limit and upper limit sensors S1 and S2 are mounted on the lower and upper sides of the ball screw 86 to detect the lower limit and the upper limit of the screw nut 24 which are linearly moved to control the lower limit detection signal and the upper limit detection signal. Output to 100). The controller 100 may be used to set the origin of the driving motor 80 using the lower limit detection signal and the upper limit detection signal.

The operation panel 104 is preferably located at the front of the controller 10. As shown in FIG. 11, the power for turning on and off the power of the display unit 108, the input unit 106, and the main body of the controller 10 is shown. And a switch 109.

Referring to FIG. 11, the display unit 108 of the operation panel 104 displays various operation states or operation state messages under the control of the control unit 100, and may be implemented in an LCD form having a backlight.

In addition, the input unit 106 of the operation panel 104 has a mode key (MODE), a menu key (MEM), a step up-down key (STEP UP), and a F1 key as well as numeric input keys of 0 to 9 for numeric input. It includes function keys including F2 key, direction key (◀ ▶ ▲ ▼), ENT key and ESC key for additional deletion.

Using the MODE key among the function keys, the operator can select the automatic mode, manual mode and program mode.

In the automatic mode, a sequence program or operator programming sequence program set as a default is executed. In the manual mode, the operator manually adjusts the slime discharge pressure and discharge speed by changing the speed of the driving motor 80, reverse rotation, and selecting the output stage. I can regulate it. In the program mode, the operator can write and input a sequence program for controlling the desired quantitative discharge. That is, the operator sets the input signal terminals, the output signal terminals, the delay time between the operation and the operation, the speed of the driving motor 80, the operating state of the driving motor 80 in the program mode (forward, reverse, stop). ) And the operator programming sequence program may be stored in the memory unit 102 under the control of the controller 100.

The operator can use the menu key MEM to select the desired unit mode, for example, the flow rate mode, the velocity mode, and the mass / volume mode.

When the operator enters the weighing unit mode and selects the flow mode, the rotational speed of the drive motor 80 is controlled while maintaining the constant rotational speed of the drive motor 80 so that the flow rate of the desired mucus is discharged after the measurement. And, if the operator selects the speed mode to control the rotational speed of the drive motor 80 so that the desired flow rate per unit time can be metered and discharged. In addition, when the operator selects the mass / volume mode, up to the specific gravity of the liquid to be measured (for example, the specific gravity of alcohol is 0.8), the liquid weight [g] to be measured and discharged is controlled to be displayed on the display unit 108.

Although the menu key may be used to select the weighing unit mode, it should be understood that the buttons corresponding to each mode (flow mode, velocity mode, mass / volume mode) may be additionally provided in the input unit 106. .

In the function keys of the input unit 106, the step up-down key (STEP UP) is used differently according to the manual mode and the program mode. In the manual mode, the speed of the driving motor 80 is used to increase or decrease the speed. Used to increase or decrease the input step. The F1 key is used for returning to the home position of the drive motor 80 in the manual mode, and the F2 key for addition and deletion is used for deleting or adding one step of program in the program mode. Direction keys (◀ ▶ ▲ ▼) are used in manual mode or program mode.In manual mode, the drive motor 80 is rotated forward or reverse, or it is used as a shift key when experimenting with each output stage operation. Is used to change the contents of each step. The ENT key is used in manual mode or program mode. In manual mode, it is used as an execution key. In program mode, a new program is used as a save key after setting or modifying a new program. ESC key is used to cancel the program set or modified in the program mode and move to the automatic mode.

By using the various keys of the input unit 106 of the operation panel 104, the operator can program a sequence program to achieve the desired weighing, and the inflow, metering and discharging control can be performed at various desired conditions with respect to the slime. have.

In the present invention, the parameters to be considered in accurate and precise weighing for the mucus, the rotational speed of the drive motor 80, the reduction ratio of the reducer 82 in the drive motor 80, the lead distance in one rotation of the ball screw 86 And the diameter and the moving distance of the chamber rod 14. Knowing the rotational speed of the driving motor 80, the reduction ratio of the reduction gear 82 in the driving motor 80, and the lead distance when the ball screw 86 rotates one time, the moving distance and the moving speed of the chamber rod 14 are known. Since the diameter of the chamber rod 14 is given as a known value, it is possible to know the flow volume flowing in and out of the metering cylinder chamber 34 of the metering block 16, The rotation speed can also be converted into a time value. Therefore, it is possible to accurately know the slime metering value and the metering slime discharge rate in the metering block 16.

In addition, the operator can use the input unit 106 of the operation panel 104 to properly produce a variety of discharge rate desired by the operator, the discharged mucus can also know the intermediate state of the discharge amount, by controlling the rotational speed of the drive motor 90 The discharge pressure can also be changed and set during the middle of the slime discharge. In addition, since the discharge control is performed electrically, there is no residual discharge pressure, so there is no phenomenon of ejection of the discharge liquid.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

1 is a perspective view of an electric liquid discharge pump device of the present invention,

2 is a partially exploded perspective view of the electric liquid discharge pump device of the present invention,

3 is a side rear perspective view of FIG. 1;

Figure 4 is a side cross-sectional view of the electric liquid discharge pump device of FIG.

5 is an exploded perspective view of the liquid discharge pump of FIG.

6 and 7 are cross-sectional view of the liquid discharge pump of FIG.

8 and 9 are main cross-sectional side views of the liquid discharge pump,

10 is a circuit block diagram of the electric liquid discharge pump device of the present invention,

11 is a state diagram of the operation panel of the controller,

12 is a perspective view of main parts related to the joint and the transfer guide of FIG. 2;

 <Explanation of symbols for main parts of the drawings>

(2)-Stand (4)-Liquid Discharge Pump

(6)-Weighing block (8)-Chamber rod drive

(10)-controller (14)-chamber rod

(16)-Weighing block (18)-Valve control block

(20)-Inlet (22)-Outlet

(24)-Screw nut part (26)-Joint

(28)-Locking groove (30)-Joint ball

(32)-Fixture (34)-Weighing Cylinder Chamber

(36)-Conduit (37)-Inner passage

(38)-valve rotator (39)-through passage

(40a) (40b)-Packing support member (42)-Switching valve

(50)-Pneumatic cylinder block (52)-Operation block

(54)-operating room (56)-rod

(58)-rack part (60)-piston

(62)-Air inlet for liquid discharge (66)-Air inlet for liquid inlet

(74)-Pinion Gear (76)-Gear Rotator

(80)-Drive motor (82)-Reducer

(86)-Ball Screw (104)-Operation Panel

Claims (5)

delete delete In the liquid discharge pump device for measuring and discharging mucus, A chamber rod operating in the metering cylinder 34 of the metering block 16 is fastened and fastened by a liquid discharge pump 4 having a metering block 16 and a valve control block 18 on the front face of the stand 2. 14, a conveying guide 6 for guiding linear conveyance includes a driving motor 80 capable of forward and reverse rotation at the rear of the stand 2, and a chamber rod driving part for driving the chamber rod 14 to be linearly moved. (8) is configured to be mounted, the stand (2) is equipped with a controller (10) for controlling the valve control block (18) to be pneumatically operated and to control the driving of the drive motor (80), the metering block ( 16, which communicates with the metering cylinder 34 and operates to selectively form the metering chamber 34 through the inlet 20 and the outlet 22 of the slime according to the pneumatic operation of the valve control block 18. Built-in configuration of the conversion valve 42, The chamber rod driving unit 8 allows the ball screw 86 to be rotatably installed on the reducer 82 connected to the drive motor 80, and connects the front and rear parts of the stand 2 to the ball screw 86. The screw nut part 24 coupled to the joint 26 is screwed, The joint 26 is formed with a locking groove 28 having a guide groove line at an inner side depth at the tip thereof, and the locking groove 28 of the chamber rod 14 operating in the weighing cylinder chamber 34 in the weighing block 16. The uppermost joint ball 30 is fitted and locked, and the weighing block 16 is fitted into the through hole of the fixing stand 32 fastened to the front surface of the stand 2, and then the seal holder 35 and the lock nut 33 are sealed and nuts. Electric liquid discharge pump device characterized in that the fastening fixed configuration. The conversion valve (42) according to claim 3, wherein the conversion valve (42) is provided with a coupling pipe (36) made of a synthetic resin material having holes (36a, 36b, 36c) formed up and down and forward to the conversion valve installation hole of the metering block (16). The upper fitting hole 36a is in communication with the inner passage 37 of the metering cylinder 34 and the front passage 36b is in communication with the inlet 20 of the weighing block 16 and the lower passage 36c. It is configured to be in communication with the discharge port 22 of the metering block 16, the valve rotating body 38 having a three-way passage 39 of the "┴" shape is inserted into the coupling pipe body 36 and to the left and right sides thereof. An electric liquid discharge pump device, characterized in that the assembly is assembled to be fastened to the left and right fastening pieces (44a) (44b) after the sealing sealing member (40a) (40b). 5. The valve control block 18 is configured such that the upper pneumatic cylinder block 50 and the lower actuating block 52 are tightly coupled up and down, and in the operating chamber 54 of the pneumatic cylinder block 50. A piston 60 having a rack portion 58 formed therein is inserted at the bottom of the rod 56, and the operating chamber 54 is configured to communicate with an external liquid inlet air inlet 66 and a liquid outlet air inlet 62. , A rod 56 of the pneumatic cylinder block 50 is inserted into the rod actuating groove 70 in the actuating block 52, and a pinion gear is formed in the rotating body actuating groove 72 perpendicularly connected to the rod actuating groove 70. 74 is integrally formed so that the gear rotating body 76 is inserted so that the rack portion 58 of the piston 60 and the pinion gear 74 of the gear rotating body 76 is connected to the gear, the gear rotating body 76 ) Is an electric liquid discharge pump device, characterized in that configured to be connected to the valve rotor (38) of the metering block (16).

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