JPH063762Y2 - Device for preventing liquid dripping from a filling nozzle in a liquid filling machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing dripping from a filling nozzle in a liquid filling machine used to fill a container with a liquid such as a fluid food.

2. Description of the Related Art As the above-mentioned filling machine, a metering cylinder having a built-in piston, a filling nozzle having an upper end connected to the metering cylinder, and a liquid flowing in the filling nozzle mounted between the upper and lower ends of the filling nozzle. It is known that a check valve that allows the liquid flow in the filling nozzle but prevents the reverse flow is provided, and a porous body that is attached to the lower end of the filling nozzle and prevents the liquid in the filling nozzle from flowing down due to its own weight.

By the way, in a filling machine, it is necessary to fill a plurality of types of liquids having different viscosities, but even if it is attempted to fill this with one type of filling nozzle, the liquid is not sufficiently drained by the porous body and liquid drops from the filling nozzle. May occur.

Therefore, the check valve moves up and down due to the pressure fluctuation generated in the metering cylinder by the operation of the piston, and the upward movement causes a negative pressure for preventing liquid dripping from the filling nozzle between the check valve in the filling nozzle and the porous body. Devices for preventing dripping are known.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above device, the vertical movement of the check valve is regulated by a flange or a step machined on the inner surface of the filling nozzle. Therefore, it is difficult to make the moving distance of the check valve constant due to variations in processing accuracy, and a desired negative pressure cannot be obtained. If the obtained negative pressure is less than the desired negative pressure,
If liquid is dripping from the filling nozzle and is too large, air may be sucked into the filling nozzle through the porous body.

An object of the present invention is to provide a device for preventing liquid dripping from a filling nozzle that solves the above problems.

Means for Solving the Problems A device for preventing liquid dripping from a filling nozzle according to the present invention comprises a metering cylinder containing a piston, a filling nozzle whose upper end is connected to the metering cylinder, and an intermediate portion between the upper and lower ends of the filling nozzle. A check valve that is attached to the bottom of the filling nozzle and that allows the liquid to flow down in the filling nozzle but prevents the backflow thereof; and a porous body that is attached to the lower end of the filling nozzle and prevents the liquid inside the filling nozzle from flowing due to its own weight. In a liquid filling machine, the check valve moves up and down due to the pressure fluctuation generated in the metering cylinder due to the piston operation, and the upward movement prevents the liquid from dripping from the filling nozzle between the check valve in the filling nozzle and the porous body. A valve guide that guides the check valve so that it can move up and down so that negative pressure is generated, an upward movement stopper that regulates the upward movement of the check valve, and a downward movement stopper that regulates the downward movement of the check valve. Upward movement stopper and downward movement It is provided with a stopper guide that guides at least one of the stoppers so as to be vertically movable, and a means for adjusting the vertical position of the vertically moving stopper.

In the liquid dripping prevention device according to the present invention, when the vertical position of at least one of the stoppers is appropriately adjusted to adjust the distance between the stoppers and thus the movement distance of the check valve,
The desired negative pressure is obtained.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the liquid quantitative filling machine includes a vertical quantitative cylinder 11 and a vertical filling nozzle 12 arranged alongside the quantitative cylinder 11. The filling nozzle 12 is located above the transfer path of the container transfer conveyor 13.

The metering cylinder 11 is provided with a piston 14, and the operation of the piston 14 forces the filling liquid to be sent from the metering cylinder 11 to the filling nozzle 12. The porous body 15 is attached to the lower end of the filling nozzle 12,
A strainer 16, a lower check valve 17, a lower stopper 18, and an upper stopper 19 are arranged in this order from below to above. The porous body 15 allows the flow of the filling liquid forcedly fed from the metering cylinder 11 to the filling nozzle 12, but when the feeding is stopped, it resists the gravity of the filling liquid in the filling nozzle 12. This is for keeping the filling liquid in the filling nozzle 12. The strainer 16 is for filtering foreign substances such as solids of milk fat mixed in the filling liquid flowing down in the filling nozzle 12. Lower check valve 17
Allows the filling liquid to flow down but does not allow it to flow backward, and the piston 14 operates to move up and down due to pressure fluctuations generated in the metering cylinder 11. Negative pressure is generated between the check valve 17 and the porous body 15, which acts to prevent liquid dripping from the filling nozzle 12. The lower stopper 18 regulates the downward movement of the lower check valve 17, and the upper stopper 19 regulates the upward movement of the lower check valve 17.

Referring to FIG. 2, the metering cylinder 11 includes a top wall 21 and a peripheral wall 22.
And the bottom wall 23. Upward entrance port 24 on top wall 21
And a right-pointing outlet port 25 are provided respectively.
The inlet port 24 is connected to a filling liquid tank (not shown) via a T-shaped connecting pipe 26. Top check valve in connecting pipe 26
27 is provided (see FIG. 1). The upper check valve 27 operates so as to allow the filling liquid to flow into the metering cylinder 11 but not the reverse flow thereof. An upward projecting slide guide cylinder 28 is integrally provided at the center of the bottom wall 23 of the piston 14.

The piston 14 comprises a top plate 31 and a skirt 32. The sliding guide tube 28 is
The upper end of the piston rod 33 that is passed through is connected.
The upper end of the vertical elevating rod 34 is connected to the lower end of the piston rod 33. The outer diameter of the skirt 32 is formed smaller than the inner diameter of the peripheral wall 22 of the metering cylinder 11, and a gap is created between the two. The upper and lower openings of the gap are closed to close the peripheral wall 22 and the skirt 32 of the metering cylinder 11.
Upper and lower membranes 41 and 42 made of an elastic material such as rubber are arranged so as to form a sealed space between and.

The upper membrane 41 includes a central disc-shaped portion 41a that is in close contact with the upper surface of the top plate 31, an outer flange portion 41b that is held between the top wall 21 and the peripheral wall 22 of the metering cylinder 11, and a disc. It is composed of a bent portion 41c having a U-shaped cross section that connects the shaped portion 41a and the outer flange portion 41b. The lower membrane 42 includes an inner flange portion 42a fixed to the lower end of the skirt 32, an outer flange portion 42b clamped between the peripheral wall 22 and the bottom wall 23 of the metering cylinder 11, and an inner flange portion 42a. And outer flange 42
It is composed of a substantially inverted U-shaped bent portion 42c connecting b. A vacuum pipe 43 is connected to the middle space of the peripheral wall 22 of the metering cylinder 11 so as to communicate with the sealed space formed by the membranes 41 and 42.

Referring to FIG. 3, the filling nozzle 12 includes four first to fourth cylindrical members 51 to 54 which are sequentially connected from top to bottom.
Consists of. On the peripheral wall of the first tubular member 51, there is a leftward facing inlet port.
55 is provided, which is connected to the outlet port 25 of the metering cylinder 11. A female screw member 56 is covered on the upper end opening of the first tubular member 51. A female screw 57 is provided at the center of the female screw member 56. A flange 58 is provided on the inner surface of the first tubular member 51 immediately above the inlet port 55, and a stopper guide 59 is interposed between the flange 58 and the female screw member 56. The stopper guide 59 has a guide hole 60 coaxial with the female screw 57. A fluid pressure cylinder 62 is mounted vertically downward on the upper surface of the female screw member 56 via a plurality of vertical rod-shaped spacers 61. Rod of the same cylinder 62
A valve retainer rod 64 is connected to 63. The inner peripheral surface of the second tubular member 52 is a sliding guide surface 65 that is smoothly finished except for a part of its upper end. The lower portion of the second tubular member 52 is inserted into the upper portion of the third tubular member 53, and is located below the lower end of the inserted portion and is directed upward in the middle of the height of the inner surface of the third tubular member 53. A step 66 is provided. Fourth
An inward flange 67 is provided at the lower end of the tubular member 54.

The porous body 15 is composed of a plurality of perforated plates 71 arranged vertically in parallel with each other and a ring-shaped spacer 72 interposed between the peripheral edges of two adjacent perforated plates 71. The lowest porous plate 71 is received by the flange 67 of the fourth tubular member 54, and the tubular spacer 73 is interposed between the uppermost porous plate 71 and the lower end of the third tubular member 54.

The strainer 16 includes an annular frame portion 81 that is received by the step portion 66 of the third tubular member 53, and a filtering portion that is connected to the inner peripheral edge of the frame portion 81.
It consists of 82. The filtering portion 82 is formed of a perforated plate in a generally mortar shape, and includes a tapered peripheral wall 82a and a flat horizontal bottom wall 82b. The porosity of the perforated plate is 2
It is equivalent to that of a 0 mesh wire mesh.

The lower check valve 17 is fitted into the lower end of the sliding guide surface 65 of the second tubular member 52 so as to be vertically movable, and has a lower surface serving as an inwardly tapered seat surface 91a and a seat surface 91a. It is composed of a mushroom-shaped valve body 92 having an outwardly facing tapered surface 92a and a compression coil spring 93 which biases the valve body 92 upward. A seal ring 94 is attached to the outer peripheral surface of the valve seat 91. A spring receiver 95 is integrally provided on the valve seat 91, and a spring retainer 97, to which the spring receiver 95 and the upper end of the valve rod 96 are fixed, clamps the spring 93. A vertical rod 98 is connected to the upper end of the valve rod 96 so as to be aligned with the valve rod 96, and the upper end of the vertical rod 98 extends to a position just below the valve holding rod 64. When the fluid pressure cylinder 62 is operated to lower the valve retainer rod 64 and lower the valve body 92, the lower check valve
17 is open. This is performed for the purpose of removing air at the time of starting the filling operation.

The lower stopper 18 includes the lower end of the second tubular member 52 and the strainer 16.
It is a cylindrical body that is held between the upper ends of the frame portion 81 of
When the valve seat 91 is in contact with the upper surface of the valve seat 91, the downward movement of the valve seat 91 is stopped.

The upper stopper 19 is a contact ring 104 facing the valve seat facing the valve seat with a gap C that allows the valve seat to move up and down from above, and upwards from four positions in the circumferential direction of the contact ring 104. The four vertical ring suspension rods 103 extending in the vertical direction, the radial vane-shaped coupling member 102 coupling and fixing the upper ends of the four ring suspension rods 103, and the upper portion extending upward from the central portion of the coupling member 102. Project above the filling nozzle and hold the valve
It consists of a cylindrical vertical rod 101 having a central hole through which 64 is passed. A male screw 105 is formed on the upper portion of the outer surface of the vertical rod 101, and the male screw 105 is screwed into the female screw 57 of the female screw member 56. The upper part of the male screw 105 projects upward from the female screw 57, a lock nut 106 is screwed into the projecting portion, and a knob 107 is fixed to the upper end of the vertical rod 101 from above.

When the stopper nut 106 is loosened and the stopper 19 is normally rotated by the knob 107, the stopper 19 descends, and when it is rotated in the reverse direction, the stopper 19 rises. As a result, the moving distance of the valve seat 91 is adjusted. Filling nozzle 12 as the moving distance increases
The negative pressure generated inside will naturally increase. Moving distance is 0
It is adjusted in the range of 1 mm, and it is set to be larger as the viscosity of the liquid to be filled becomes larger.

FIG. 5 shows a piping system diagram of the vacuum pipe 43 connected to the metering cylinder 11. Although two metering cylinders 11 are shown in the figure, the number may be one or three or more.

The two vacuum pipes 43 respectively connected to the metering cylinders 11 are individually led to the air tank 111. The air tank 111 is for preventing this system from being affected by pressure fluctuations from other systems.
Between the air tank 111 and the vacuum pump 112, an air filter 113 and an opening / closing valve are installed from the side closer to the vacuum pump 112.
114 and a solenoid valve 115 are sequentially arranged. Solenoid valve 115
Is for shutting off the vacuum pipe 43 and maintaining the vacuum degree of the vacuum pipe 43 when the vacuum pump 112 is stopped in an emergency or at the end of work. Then, between the air tank 111 and the metering cylinder 11, an orifice plate 116 and a pressure detector 117 with contacts are sequentially arranged from the side closer to the air tank 111. The bypass pipe 11 is attached to the orifice plate 116 and the pressure sensor 117 with contacts.
8 is provided with an on-off valve 119. The on-off valve 119 is fully opened when the membrane is attached, and fully closed after the attachment. Further, a sight glass 120 is arranged in the immediate vicinity of the metering cylinder 11. Membrane 4
If there is a leak of the filling liquid from 1, 42, the leak can be visually observed through the sight glass 120.

A large number of unions and couplers (not shown) are interposed in the vacuum pipe 43, and there is an unavoidable leak. The amount of this leak will be called a standard leak amount.

The orifice plate 116 is for keeping the pressure acting on the pressure detector 117 at a set pressure, for example, less than 20 mmHg when there is no leak in the membranes 41 and 42 and a standard leak amount of fluid is flowing in the vacuum pipe 43. The orifice plate 116 is 0.2 to 1.0 mm depending on the size of the standard leak amount.
A hole with a hole diameter of Pressure detector 117
When the pressure acting on this is equal to or higher than the set pressure, the contact is turned on and an electric signal is output. When a leak such as a pinhole occurs in the membranes 41 and 42, the pressure acting on the pressure detector 117 is instantly 60 mmHg.
The pressure rises to a certain degree, and the pressure detector 117 detects this and outputs a signal. This output signal is used as a leak detection signal, and the operation of the quantitative filling machine is stopped based on the leak detection signal.

Effect of the Invention According to the present invention, a desired negative pressure can be obtained by adjusting the vertical position of at least one of the stoppers appropriately to adjust the distance between the stoppers, and thus the movement distance of the check valve. It is possible to efficiently fill a plurality of types of liquids having different types with one type of filling nozzle without causing liquid dripping.

[Brief description of drawings]

The drawing shows an embodiment of the present invention, FIG. 1 is a vertical sectional view,
2 and 3 are enlarged sectional views showing a part of FIG. 1, FIG. 4 is an enlarged sectional view showing a part of FIG. 3, and FIG. 5 is a vacuum pipe piping system. It is a figure. 11 ... Metering cylinder, 12 ... Filling nozzle, 14 ... Piston, 15
… Porous body, 17… Check valve, 18, 19… Stopper, 91… Valve seat.

Claims (1)

[Scope of utility model registration request] 1. A metering cylinder 11 containing a piston 14.
And a filling nozzle whose upper end is connected to the metering cylinder 11.
12 and a check valve 17 mounted between the upper and lower ends of the filling nozzle 12 and allowing the liquid to flow down in the filling nozzle 12 but preventing its backflow; and a check valve mounted at the lower end of the filling nozzle 12 and inside the filling nozzle 12. In a liquid filling machine equipped with a porous body 15 that prevents the liquid from flowing down due to its own weight, the check valve 17 moves up and down due to the pressure fluctuation generated in the metering cylinder 11 by the operation of the piston 14 A valve guide 91 that vertically guides the check valve 17 so that a negative pressure for preventing liquid dripping from the filling nozzle 12 is generated between the check valve 17 in the nozzle 12 and the porous body 15, and a check valve. 17 an upward movement stopper 19 that regulates the upward movement, a downward movement stopper 18 that regulates the downward movement of the check valve 19, and at least one of the upward movement stopper 19 and the downward movement stopper 18 is vertically movable. Provided with a stopper guide and means for adjusting the vertical position of the vertically moving stopper. A device that prevents the liquid from dripping from the filling nozzle.