JPS6015097A - Belt press type dehydrator - Google Patents

Abstract

PURPOSE:To correct effectively snaking of a high-pressure belt which presses upper and lower belts to a high-pressure roll by providing a regulating roll for correcting snaking to the high-pressure belt, and correcting the roll by a vertically arrayed double-acting hydraulic cylinder. CONSTITUTION:A regulating roll RR for correcting snaking is provided to a high-pressure belt BH which presses upper and lower belts for dehydration of sludge to a high-pressure roll. One end of a vertically arrayed double-acting hydraulic cylinder 1 fixed coaxially with two double-acting hydraulic cylinders which have two ports, are closed at one end and are projected with a piston rod 2 or 2' at the other end. The other end of said cylinder is fixed to a perpendicular column 3. When the belt BH snakes to the right side, said movement is detected by a limit switch and the cylinder 1 is extend to correct the snaking. When the belt snakes to the left side, the cylinder 1 is stretched or contracted to correct the snaking. The service lifetime of the belt BH is thus increased.

Description

[Detailed description of the invention] The present invention relates to a belt press type dehydrator.

With the spread of sewage systems, the amount of sludge generated from sewage treatment plants is increasing year by year, so it has become increasingly important to increase the degree of sludge dewatering using a dehydrator in order to reduce the cost of sludge incineration in the subsequent stage.

Therefore, in this type of dehydrator, it is very important to increase the tension of the high-pressure belt in the final stage and to prevent it from meandering. This is because the tension in the belt is high, and if the meandering is not quickly corrected, the belt will soon be seriously damaged.

In conventional belts made of P cloth, a displacement detection rail (-) is provided at either the left or right width end of the belt, and an air cylinder with a positioner using proportional control moves the regulator roll by the necessary amount to correct belt meandering. Measures have been taken.

However, with such meandering correction means, it is good when the belt is made of P cloth like a low-pressure belt, but when the belt is made of metal and stretched with great tension like a high-pressure belt, the pressure is 1o#. Ordinary pneumatic cylinders of less than /d are impractical due to insufficient output, so hydraulic cylinders must be used.

Hydraulic cylinder is high pressure (50~100kglcr&)
Since the belt is operated by a cylinder, the output is large, but unlike an air cylinder, the stroke cannot be adjusted to an arbitrary intermediate position using a positioner, and the adjustment requires reciprocating the belt to both the left and right ends, which can cause the belt to deform. The performance of the high-pressure dewatering roll is not fully demonstrated due to the dehydration roll being damaged or damaged.

The present invention was proposed in view of the above circumstances, and an object of the present invention is to provide a high-performance belt press type dehydrator that effectively corrects meandering and increases the service life of a high-pressure belt.

To this end, the present invention provides a belt press type that is equipped with two sets of endless belts that move parallel to each other at the same speed to squeeze and dewater the sludge, and whose meandering is corrected by a correction roll deflected by a fluid pressure cylinder. In a dehydrator, a tandem double-acting hydraulic cylinder is formed by coaxially fixing two double-acting hydraulic cylinders each having two boats, one end of which is closed, and a piston rod protruding from the other end; The present invention is characterized in that it includes a hydraulic control circuit that supplies and discharges the four port NC hydraulic pressures of the cylinder.

An embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is an overall side view thereof, Fig. 2 is a partially enlarged view showing the meandering regulating roll of the high-pressure belt in Fig. 1, and Fig. 3 is a plan view of Fig. 2. figure,
Figure 4 (Season.

(F) and (L) are explanatory diagrams showing the action of the hydraulic cylinder shown in FIG. 3, respectively, and FIG. 5 is a hydraulic system diagram of the hydraulic cylinder shown in FIG. 3.

First, in Figures 1 to 3, BL is the lower belt, BU is the upper belt, RL is the low pressure roll, l (H is the high pressure roll, RC is the squeeze roll, CY is the hydraulic cylinder, and the upper bell) BU and the lower belt BL are The sludge is sandwiched between a low pressure roll RL, a squeeze roll RC, and a high pressure roll RHO.

BH is a high-pressure belt, which is passed around the high-pressure roll RH along the outside of the lower belt BL and the upper belt 13U, which are passed around the high-pressure roll RH, and is given a huge tension by a hydraulic cylinder CY. .

Jl, R, are recrylate rolls for correcting the meandering of the high-pressure belt BH.

Reference numeral 1 designates a tandem double-acting hydraulic cylinder according to the present invention, which consists of two double-acting hydraulic cylinders having respective piston rods 2 and 2' arranged in tandem, and has a total of four boats p+, P.
2, P3. It has P4. 3 is a vertical column of the main body of the belt press dehydrator to which the other end of one piston 2' is pivotally attached, 5 is a rail, and 6 is a slide pedestal that slidably supports a bearing 7 that pivotally supports the other end of the regulator roll RR. , 8 is a bearing that pivots the other end of the regulator roll RR,
9 is a high pressure hydraulic system.

In such a device, as shown in FIG.
When the high-pressure belt (BH) meanders to the right, the displacement detection limit switch detects the meandering of the high-pressure belt (BH) and is activated, and in the manner described below, extends the tandem double-acting hydraulic cylinder 1 to control the regulator roll RR. is slightly rotated around the bearing 80 in the direction of arrow L', so that the rightward meandering of the high-pressure belt is corrected.

When the high-pressure belt BH meanders to the left, the hydraulic cylinder 1 contracts and rotates the regulator roll RR slightly in the direction of the arrow R, so that the left-hand meander of the high-pressure belt is immediately corrected.

When the high-pressure belt returns to its normal position, the regulator roll returns to the neutral position N.

Hydraulic pressure is supplied and discharged to and from such tandem double-acting hydraulic cylinders in the following manner.

That is, in FIG. 5, the hydraulic pressure is transferred from the high-pressure hydraulic system 9 for urging the high-pressure roll RH to the bows Pi and P2 of the tandem double-acting hydraulic cylinder 1 via the electromagnetic switching valve SV2, and via the electromagnetic switching valve SV3. Bo) P3. Connected to P4.

Therefore, via the electromagnetic switching valves SV2 and SV3,
Port P2. When P4 is refueled, the tandem double-acting hydraulic cylinder performs the stroke shown in the 4th country, which corresponds to the regulation roll at the neutral position N shown in FIG.
When the baud) P+ and P4 are refueled, the tandem double-acting hydraulic cylinder performs the stroke shown in FIG. 4 (11()), which corresponds to the regulation roll at position R in FIG. When P3 is refueled, the tandem double-acting hydraulic cylinder performs the stroke shown in FIG. 4(L), which corresponds to the position of the regulator roll in FIG. 3.

According to such a hydraulic system, the high-pressure roll 4 and the high-pressure hydraulic system for urging are used to drive the regulator roll, so the equipment cost for a new hydraulic power source can be saved, and a sufficiently strong driving force can be obtained. Therefore, the meandering of the belt can be smoothly and quickly corrected despite the enormous tension of the high-pressure belt.

In short, according to the present invention, the belt press is equipped with two sets of endless belts that move parallel to each other at the same speed to squeeze and dewater sludge, and whose meandering is corrected by a correction roll deflected by a fluid pressure cylinder. In a type dehydrator, two double-acting hydraulic cylinders each have two ports, are closed at one end, and have a piston rod protruding from the other end.
A high-performance belt press type dewatering machine is equipped with a vertical double-acting hydraulic cylinder fixed coaxially and a hydraulic control circuit that supplies and discharges hydraulic pressure to the four ports of the vertical double-acting hydraulic cylinder. Therefore, the present invention is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing one embodiment of the present invention.
Fig. 3 is a plan view of Fig. 2, Fig. 4 (R), (N),
(L) is an explanatory view showing the action of the hydraulic cylinder shown in FIG. 3, and FIG. 5 is a hydraulic system diagram of the hydraulic cylinder shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Vertical double-acting hydraulic cylinder, 2, 2'... Piston rod, 3... Vertical column, 4... Limit switch, 5... Rail, 6... Slide pedestal, 7.8・・・
・Bearing, 9...High pressure hydraulic system, BL...
Lower belt, BH...High pressure belt, BU...Upper belt, CY...Hydraulic cylinder, Pl. P2. P3. P4...port, P'M...pump,
RC...press roll, RL...lower roll, RH・
... Upper roll, RR... Regulator roll, SV2
, SV3...Solenoid switching valve, Agent: Masashi Tsukamoto, Patent Attorney Figure 1 B (J Figure 2 @ ≦ Figure 3 Figure 4

Claims (1)

[Claims] In a belt press type dewatering machine, the belt press type dehydrator is equipped with two sets of endless belts that move parallel to each other at the same speed to squeeze and dewater sludge, and whose meandering is corrected by a straightening roll deflected by a fluid pressure cylinder. A tandem double-acting hydraulic cylinder is formed by coaxially fixing two double-acting hydraulic cylinders each having two ports, one end of which is closed, and a piston rod protruding from the other end;
A belt press type dewatering machine characterized by being equipped with a hydraulic control circuit that supplies and discharges hydraulic pressure to each port.