JPH01296113A - Weighing unit for constant amount feeder of grease or the like - Google Patents

Abstract

PURPOSE:To prevent material such as grease from remaining within a unit after the end of working, by making a slide plunger slide on a guide plunger integral with a piston rod of a drive cylinder with a slide amount made variable. CONSTITUTION:A guide plunger 2a in a proper length with a diameter thereof smaller than that of a plunger 2 while a position variable stopper section 5 is mounted on the tip side thereof is provided successively at the tip of a plunger 2 formed integral with a piston rod 3b of a drive cylinder D. A slide plunger 4 is mounted on the guide plunger 2a as having an inner diameter shorter than an effective length of the plunger 2 while being closely loaded into the guide plunger 2a and an outer diameter the same as a piston rod 2. Then, a slide of the slide plunger 4 for the guide plunger 2a is adjusted by a stopper member 5 to keep the amounts of intake and discharge of material constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a metering unit of an apparatus for supplying a high viscosity material such as grease in fixed quantities.

[Conventional technology]

For example, mechanical devices that incorporate a gear train, such as a gearbox, are injected with a minute amount of grease for lubrication during the assembly process. A measuring unit is essential that has the function of accurately measuring even a small amount of grease and discharging the grease after metering.

Conventionally, as a weighing unit with the above functions,
A plunger type metering and dispensing mechanism is used.

[Problem to be solved by the invention]

However, Figures 4 and 5, which are cited as one of the known examples,
The metering unit shown in the figure consists of a metering plunger M and its driving cylinder D, but the following problems arise due to its structure.

That is, in the cylinder 11 of the metering plunger M.

A material suction hole 11a and a discharge port 11b are formed at different positions on the stroke stroke of the plunger 22, and a drive piston 33 is formed at the rear end of the plunger 22.
A is connected to the cylinder 11, and a stroke amount (discharge amount) adjusting rod llc is provided at the tip of the cylinder 11. Furthermore, the plunger 22 has a material reservoir chamber 22a and a material reservoir chamber 22a.
A material passage 22b communicating with 2a is formed. In addition, 33b is the piston rod of the drive cylinder D, 33c,
33d is a drive air supply/discharge port.

In the metering unit, when the plunger 22 retreats to the left in the figure by an appropriate stroke amount, the pressurized and supplied material enters the cylinder 11 through the suction hole 11a, and the tip of the plunger 22 and the stroke adjustment rod LLC, the metering chamber lid and the material storage chamber 2.
It accumulates in 2a.

The material is discharged by moving the plunger 22, which has been retracted to its tip, forward (to the right in the figure) until its tip abuts the adjustment rod 11.
Since the metering space of the cylinder 11 sandwiched between C and the tip of the plunger 22, the material storage chamber 22a, and the passage 22b are filled, the material supplied under pressure fills these spaces 11d and 2.
A time lag occurs until filling 2a and 22b.

Moreover, even if the discharge is finished, the material reservoir chamber 2 of the plunger 22
Since the material will remain in the passage 2a and the passage 22b, in order to inhale and discharge materials of the same type but with different conditions such as viscosity, it is necessary to discharge the previous material.
Until the next material can be discharged from the discharge hole 1b,
In other words, it is unreasonable and troublesome to have to perform so-called blank firing until the remaining material is completely discharged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a weighing unit that does not have the above-mentioned drawbacks.

[Means to solve the problem]

The structure of the present invention for solving the above problem is that a material suction hole is provided on the stroke stroke of the cylinder.

In a metering unit of a quantitative supply device for grease, etc., which is mainly formed of a metering plunger having a discharge hole and a drive cylinder connected to the plunger, a plunger part formed integrally with the piston rod of the drive cylinder. A guide plunger of an appropriate length, which has a smaller diameter than the plunger and has a stopper member whose position is variable on the tip side, is connected to the tip of the guide plunger, and a guide plunger with a diameter shorter than the effective length of the plunger and a stopper member whose position is variable is attached to the guide plunger. A slide plunger having an inner diameter that is loosely inserted into the guide plunger and an outer diameter that is the same as the piston rod is inserted, and the amount of sliding of the slide plunger with respect to the guide plunger is adjusted by the stopper member to suck and discharge the material. The feature is that the amount is quantified.

[For production]

The slide plunger slides on the guide plunger that is integrated with the piston rod of the drive cylinder, with its sliding amount being variable, so that the pressurized material such as grease is supplied to a predetermined amount with each stroke of the drive piston. The measured material itself is then discharged as is.

〔Example〕

Next, an example of the implementation of the present invention will be explained with reference to FIGS. 1 to 3.

In Figures 1 and 2, 1M is a plunger type material metering and discharging part, and here, the metering cylinder IA
A cylindrical housing portion IB and an IC are arranged in series before and after the housing portion IB and IC. Before and after the stroke stroke in this metering cylinder IA, a suction hole for the material to be supplied under pressure,
1a and a discharge hole 1b are formed.

2 is a plunger loosely inserted tightly into the metering cylinder IA of the plunger M, and the rear end side (left side in the figure) is
While it is integrated with the rod 3b of the piston 3a in the drive cylinder D, the tip side (right side in the figure) is formed into a guide plunger 2a formed of a rod thinner than the outer diameter of the plunger 2.

This guide plunger 2a has a length that is sufficiently larger than the entire length of the metering and discharging parts IA to IC, and has screws 2b cut in the front and back of the part protruding from the housing part IC on the distal end side.

A slide plunger 4 having the same outer diameter as the plunger 2 is loosely inserted into the guide plunger 2a. This slide plunger 4 is formed so that its entire length is sufficiently shorter than the total internal effective length of the metering cylinder IA and the housing part IC, and the tip side (right side in the figure) serves as a seat for a stopper member 5, which will be described later. It is formed at the thick end portion 4a so as to function.

The stopper member 5 is formed of a nut-shaped member whose front half (left side in the figure) is formed into a cylindrical portion 5a, and whose rear half is provided with a female thread 5b that is screwed into the screw 2b. .

In addition, 5c is a lock nut of the stopper member 5, and 5d is installed inside the cylindrical part 5a and is attached to the thick end part 4a of the slide plunger 4.
The spring that acts toward the left in the figure to push back the 6
6b is a limit switch provided at the rightward stroke end of the cylinder 3 to detect the rightward stroke end of the piston 3a in the driving cylinder D; and 6b is the limit switch provided at the leftward stroke end of the piston 3a.

This is a limit switch provided in the housing IC to detect slight movement of the thick end 4a of the slide plunger 4.

As mentioned above, each of the members 1 to 6 is used to measure the present invention.

This constitutes an example of a discharge unit.

In the above unit, for example, as shown in FIG. 3, the suction hole 1a is connected to the grease can G via the discharge pump P,
The discharge hole 1b is connected to a suitably structured grease injection gun I, which measures a required amount of grease in the grease can G and discharges and supplies that amount of grease to the injection gun.

Next, an example of this operation will be explained.

Now, when the piston 3a of the drive cylinder D is at the left stroke end (FIG. 1), the starting end of the guide plunger 2a of the plunger 2 is aligned with the suction hole 1a, and
The slide plunger 4 is placed on the guide plunger 2a at a position where its thick end 4a is close to the left end of the stopper member 5 under the action of a spring 5d. At this time, the front surface of the thick end portion 4a (right side in the figure) and the stopper member 5
A minute gap is formed between the front surface (left side in the figure) by the action of the spring 5d.

When the plunger 2 is in the above position, the suction hole 1a has
Since pressurized grease is supplied by the pump P, the grease is delivered to the plunger 2 in the metering cylinder 1a.
The metering space 7 formed between the rear surface of the slide plunger 4 and the front surface of the slide plunger 4 is filled with the liquid.

When the grease is supplied under pressure to the space 7 and the space 7 is filled, the slide plunger 4 moves slightly to the right against the repulsive force of the spring 5d, actuating the limit switch 6b, and this operation causes the amount of grease to be supplied to the space 7. It is electrically detected that the amount has been measured. This detection signal causes the operation of the pump P to be temporarily stopped.

Therefore, for example, when the piston 3a of the drive cylinder D is operated to take a rightward stroke based on the detection signal, the piston rod 3b, plunger 2. Guide plunger 2a, slide plunger 4. The stopper member 5 is
Move as one to the right side of the diagram.

Near the end of this working stroke, the thick end 4a of the slide plunger 4 comes into contact with the end of the housing IC and cannot move to the right. At this time, the left end of the slide plunger 4 is aligned with the position of the discharge hole 1b.

However, plunger 2. Guide plunger 2a.

Even when the slide plunger 4 is stationary, the stopper member 5 continues to move to the right as shown in FIG. Therefore, the filled grease is discharged from the discharge hole 1b.

This discharge stroke is performed until the front end surface (the right side surface in the figure) of the plunger 2 comes into contact with the rear end surface (the left side surface in the figure) of the slide plunger 4, as shown in the second figure.

Completion of discharge is detected by detecting with the limit switch 6a that the piston 3a of the drive cylinder D has reached the end of its rightward stroke. The stroke of the drive cylinder D is performed by selectively supplying pressurized air from the air supply/discharge holes 3c and 3d.

In this way, a fixed amount of highly viscous material such as grease that is pressurized and supplied to the metering space 7 can be measured and then discharged and supplied to the outside.

The capacity of the metering space 7 can be changed by moving the stopper member 5 back and forth on the screw 2b of the guide plunger 2a.

〔Effect of the invention〕

The present invention is as described above, and since the plunger has a coaxial composite structure and a metering space is formed on the outer peripheral surface of the plunger, highly viscous materials such as grease supplied under pressure do not remain in the metering unit. Since all of the measured material is discharged to the outside each time it is measured, there is no so-called empty space, and there is no possibility of materials such as grease remaining inside after the work is finished, which is extremely rational.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an example of the measuring unit of the present invention during material measurement, Fig. 2 is a sectional view of the same when discharging, and Fig. 3 is a system diagram of an example of a quantitative grease supply device using the measuring unit of the present invention. , FIG. 4 is a cross-sectional view of an example of a conventional measuring unit during material measurement, and FIG. 5 is a cross-sectional view of an example of a conventional measuring unit during material discharging. IA...metering cylinder, IB, IC...housing. 1a... Suction hole, 1b... Discharge hole, 2... Plunger, 2a... Guide plunger, 3... Drive cylinder, 4... Slide plunger, 5... Stopper member, 6a.

Claims (1)

[Claims] In a metering unit of a quantitative supply device for grease, etc., which is mainly formed of a metering plunger having a material suction hole and a discharge hole formed on the stroke stroke of the cylinder, and a driving cylinder connected to this plunger, A guide plunger of an appropriate length is connected to the tip of the plunger part formed integrally with the piston rod of the drive cylinder. , a slide plunger is inserted, which is shorter than the effective length of the plunger and has an inner diameter that is tightly loosely inserted into the guide plunger and an outer diameter that is the same as the piston rod, and the amount of sliding of the slide plunger with respect to the guide plunger is set as described above. By adjusting the stopper member, material suction,
A measuring unit for a quantitative supply device for grease, etc., characterized in that the discharge amount is fixed.