JPS601777Y2 - Filter plate tightening and maintenance device in filter machines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a furnace plate tightening and maintenance device for maintaining the pressurized closed state of the furnace plate during filtration in a furnace plate type filter.

Most furnace plate type filters use a hydraulic cylinder to press a pressure plate to close the furnace plate and filter, but oil leakage from the hydraulic cylinder or oil movement due to a defective seal packing may occur. The tightening force of the cylinder became weak and the raw solution often spouted out from between the furnace plates.

Therefore, in the past, there were some methods in which the normal closed state of the furnace plate was maintained by locking the pressurizing iron connected to the press plate with another hydraulic cylinder or the like.

However, all of them have drawbacks such as complicated configurations, requiring time and effort to operate and maintain, difficult to automate, and deformation of the pressurizing rod.

Therefore, the present invention can eliminate the above-mentioned drawbacks, and the illustrated embodiments of the present invention will be described below.

In the present example shown in FIGS. 1 and 2, reference numeral 1 denotes a pressing plate for pressing a furnace plate 2, and is connected to a pressing rod 4 of a hydraulic cylinder 3. As shown in FIG.

The hydraulic cylinder 3 is connected to a pump P via a check valve 5 and a switching valve 6.
The piping is connected to the

Further, a support arm 7 is suspended and fixed to the cylinder 3 side of one of the frames arranged on both sides of the furnace plate 2, and a sliding rod 8 is slidably fitted into a guide hole 7a provided at the tip of the support arm 7. It's inserted.

At both ends of the sliding rod 8 are upward engaging pieces 8a. 8b is provided protrudingly, and a limit switch S is mounted on the sliding rod 8 at a position near one of the engaging pieces 8a.

The limit switch S has a detection portion Sa protruding from its upper end shaped like a coil spring so as to be swingable.

An actuating body 9 is protruded from the press plate 1 so as to come into contact with the detecting portion Sa of the switch S, and a control circuit 10 is provided to drive or stop the pump P according to a signal from the switch S.

Next, the operation of this example will be explained.

First, after opening the furnace plate 2, pump P1 cylinder 3
is driven to extend the pressure rod 4 and press the pressure plate 1 to close the furnace plate 2 under pressure.

At this time, as the pressing plate 1 moves in the closing direction, the actuating body 9 moves the detection part Sa of the switch S while pressing against the engagement piece 8a, and moves the sliding rod 8 in the opening direction (see Fig. 3). .

The control circuit 10 is turned off so that the switch S will not operate even if the operating body 9 presses the detection part Sa until the closing of the furnace plate is completed.

Even if the pump P1 cylinder 3 stops driving by the hydraulic pressure switch when the furnace plate 2 is completely closed, the third
As shown in the figure, the press plate 1 stops in a state in which the actuator 9 presses the detection portion Sa against the engagement piece 8a.

From this state, the stock solution is poured into the filtration chamber and filtered, but during filtration, the clamping force of the furnace plate 2 by the press plate 1 may become weak due to oil leakage in the cylinder 3 or the like.

In this case, as shown in FIG. 4, the press plate 1 moves back slightly in the plate opening direction, and the actuating body 9 separates from the detection part Sa.

The detection unit Sa detects this separation of the actuating body 9, and the switch S
The control circuit 10 is actuated to drive the pump P by issuing a detection signal.

This causes the cylinder 3 to operate and the press plate 1 to move again in the closing direction, thereby maintaining a strong closing condition.

Then, when the actuating body 9 comes into pressure contact with the detection part Sa again, the drive of the pump P is stopped via the control circuit 10.

Incidentally, a timer may be operated in response to a detection signal from the switch S, and the pump P may be driven for a set time to tighten the furnace plate.

When filtration is completed and the oven plate is to be opened, the cylinder 3 is actuated to move the rod 4 backward and the press plate 1 to be moved in the direction of opening the furnace plate.

At this time, the actuating body 9 pushes the other engaging piece 8b and the sliding rod 8
is moved in the closing direction (see Fig. 5).

Note that the control circuit 10 is turned off during this opening.

In this manner, according to this example, the detection unit Sa detects the movement of the press plate 1 and drives or stops the pump P, so that a good plate closing state can always be maintained.

Furthermore, the length of the closing distance of the furnace plate differs each time due to clogging of the furnace cloth surface, and the distance the press plate 1 moves also differs each time.

For this reason, even if the limit switch S is fixed at a constant position, the position of the press plate 1 is unstable, so that the furnace plate cannot be tightened properly for the filtration at that time.

In this regard, in this example, the switch S is equipped with a slidable sliding rod 8 and is configured to be movable, so that when closing the plate, the press plate 1
The actuator 9 can set the switch S to a position suitable for the state of tightening of the oven plate each time, and the oven plate can be tightened appropriately each time, thereby achieving good filtration.

Moreover, the moving distance of the press plate 1 differs each time the pump P is driven depending on the state of filtration, but in this example, the switch S also moves accordingly, so the furnace plate can be tightened according to the state at that time. .

Therefore, when the plate is opened, the sliding rod 8 is moved and returned to the cylinder 3 side as shown in FIG. 5 in preparation for the next closed plate filtration.

Although this example is configured as described above, the present invention is not limited to this.

For example, the type of position detection switch does not matter; it may be a reed switch, a proximity switch, etc. As shown in Fig. 7, the actuating body protruding from the pressure plate retreats and comes into contact with the switch, and the pump is activated for the time set by the timer. It may also be driven.

Further, a configuration in which the position detection switch is movable is also suitable; for example, as shown in FIG. 6, the switch 12 may be provided on a sliding rod 11 that can be moved on a rail R.

If the switch is strong, there is no need for an engagement piece as in this example.

Further, the shape of the actuating body for actuating the switch is also arbitrary, and it may be provided on a movable body such as a furnace plate or a pressurizing rod.

Alternatively, as shown in FIG. 8, a position detection switch S may be provided on a press plate, and an actuating body that comes into contact with or in close proximity to the switch to actuate the switch may be provided movably toward the cylinder side.

Note that the configuration of the control circuit does not matter, as long as the pump can be driven or stopped based on the detection signal of the switch.

In short, the present invention is a pressurizing device for a filter that has a hydraulic cylinder that presses a pressure plate to tighten and close a furnace plate, and a pump that supplies hydraulic oil to the cylinder via a check valve, a switching valve, etc. , a position detection switch is movably disposed on the cylinder side of the filter, and an actuating body that contacts or approaches the switch to operate the switch is provided on a movable body such as a press plate or a furnace plate, or A furnace plate in a filtration machine, characterized in that a switch is provided on a pressure plate, and a control circuit is provided in which an operating body is movably arranged and the switch detects displacement of the movable body to drive or stop the pump. Tightening is a maintenance device.

Therefore, according to the present invention, when the force to tighten the furnace plate during closed plate filtration is weakened, the pressurizing sill can be activated immediately to tighten the furnace plate, and the position detection switch or operating body is made movable. The switch or actuator can be set in a position suitable for the closed state of the furnace plate each time, and the furnace plate can be tightened appropriately each time, resulting in good filtration. It also has the advantage of being easy to operate and maintain, and less likely to break down.

[Brief explanation of the drawing]

Figure 1 is a side view of a filter using an embodiment of the present invention;
Figure 2 is an enlarged front view of the A-A main part in Figure 1, Figure 3 is an enlarged side view of the main part in the closed state, and Fig. 4 is the main part in the closed state with the door plate loosened. An enlarged side view, Fig. 5 is an enlarged side view of the main part in the open state, Fig. 6
The figures are separate enlarged side views of the main parts, and FIGS. 7 and 8 are separate enlarged side views of the main parts. 1: Pressing plate, 2: Furnace plate, 3: Hydraulic cylinder, 4: Rod, 7: Support arm, 8, 11: Sliding rod, 8a, 8b: Engagement piece, 9: Operating body, 10: Control circuit, S, 12: position detection switch, Sa: detection section, P: pump.

Claims (1)

[Scope of utility model registration request] A hydraulic cylinder that presses the pressure plate to tighten and close the furnace plate;
In a pressurizing device for a filter having a pump that supplies hydraulic oil to the cylinder via a check valve, a switching valve, etc., a position detection switch is movably disposed on the cylinder side of the filter, and the switch and A movable body such as a press plate, a furnace plate, etc. is provided with an actuating body that activates the switch by coming into contact with or in close proximity, or the switch is provided on the press plate and the actuating body is movably arranged to control the displacement of the movable body. A device for tightening and maintaining a furnace plate in a filter, comprising a control circuit that detects the switch and drives or stops the pump.