KR810000397B1 - Contral system for refuse copacter - Google Patents

Abstract

In a ram-tube type refuse compactor or pelletizer variable restrictors near the discharge end of the tube(6) control the compaction pressure exerted on the refuse as it is forced through the tube(1). The restrictors(12) are moved inward and outward on each ram stroke in response to changes in the ram pressure required to advance the compacted refuse through the tube(1). The method includes:(I) measuring the ram pressure during the last smallest increment of forward travel, (II) adjusting the restrictors slightly inward, (III) measuring the ram pressure when the ram is at the lock-out point.

Description

Waste Compactor Control System

1 is a perspective view in partial section illustrating a preferred embodiment of a mechanism controlled by the method of the present invention.

2 is a plan view of FIG.

FIG. 3 is a schematic perspective view illustrating the mechanism shown in FIG. 1 having the function of providing a dense pellet of waste.

4 is a partially enlarged longitudinal sectional view illustrating the restrictor assembly shown in FIG.

5 is a graph illustrating the correlation between ram pressure and ram motion at different waste loads.

6 is a preferred electrical circuit for automatically controlling the position of a mechanical limiter in accordance with a change in ram pressure in accordance with the present invention.

FIELD OF THE INVENTION The present invention generally relates to a method or system for controlling the compression pressure in a ramtube waste compactor, and, in more detail, a restrictor in a mechanism capable of compressing the waste to form entangled pellets with each other. A system for automatically controlling (restrictors) in response to changes in pressure in a machine.

Over the years, much effort has been put into developing new technologies that can environmentally treat solid waste and, at the same time, recover the useful resources contained in the waste, if possible.

One such process is described in US Pat. No. 3,729,298, where solid waste is fed into a vertical mandrel, where the combustible portion of the waste is pyrolyzed to form a fuel gas consisting primarily of carbon monoxide and hydrogen. The non-combustible part is fluidized with molten metal and slag.

Improvements in the process described in the above-mentioned U.S. patents were described and claimed by J.E Anderson in U.S. Patent Application No. 675,935, filed April 12, 1976. In this process, the waste must be pressed into strong, cohesive pellets before being fed into the furnace.

In my U.S. Patent Application No. 675.934, filed April 12, 1976 (the full text of which is incorporated herein by reference), I am suitable for use in the improved process described above, which is suitable for compacting and dispatching waste to the brazier. A device for making pellets has been described and claimed. The structure of the device is briefly summarized as follows.

(a) a cylindrical tube having an inlet and an outlet, a supply port on the side wall of the tube near the inlet, and an outlet for the electrical tube constituting the outlet and which has a compressed waste chamber, the length of which is pellet Shorter than the shortest critical length for the waste being

(b) The feed hopper for the crushed waste has an outlet through the inlet of the tube.

(c) A reciprocating ram arranged axially with that located at the entrance of the tube, the circumference of the ram being in sliding contact with the inner surface of the tube, and for each forward stroke of the ram. ) A pressure of at least 14.1 kg / cm 2 can be applied.

(d) A device capable of restricting the supply of waste through an electric tube is a device capable of changing the degree of restrictor in response to a change in the force required to advance a compressed waste machine through the tube. .

The preferred construction of the restrictor described above consists of a number of leaves extending in the axial direction, each of which constitutes a flush section of the tube 멱, the top of which is flexibly attached to the tube and its The lower end can move radially in and out of the tube axis and has parallel edge surfaces.

The preferred embodiment of the present invention has two parallel cylindrical tubes, each of which feeds through a single metal hopper, and each of the rams in the individual tubes extends one after the other contracts. They work side by side with each other.

One object of the present invention is to provide a method or system for automatically controlling the compression pressure in a device for compressing waste according to a change in pressure required to push the waste through the electric device so that the pressure stays within a predetermined range. It is.

Another object of the present invention is to control the position of the mechanical interrupter according to the change in the ram pressure of the compression pressure of the pellet or compactor described in US Patent Application No. 675,934, filed April 12, 1976 It is to provide a method or system that can be kept within a predetermined range.

The process of automatically controlling the limit in a machine for compacting waste is as follows.

(a) a cylindrical tube having an inlet and outlet, a feed port on the side wall of the tube near the inlet, an axially aligned reciprocating guided ram (at the inlet) and at the outlet of the tube Has a discharge port.

(b) a number of restrictors near the outlet of the tube for adjusting the compression pressure applied to the waste, the limiters being changed during each ram stroke in accordance with the change in ram pressure required to advance the waste into the electric tube; You can move back and forth.

The above process consists of the following steps.

(1) Measure ram pressure during the ultimate minimum run interval of the forward ram motion (usually about 2.54 cm from the front end of the stroke).

(2) If the ram pressure measured in step (1) is less than the predetermined pressure P ₁ , adjust the limiters inside the predetermined distance.

(3) When the ram is at the lock-out point of the forward stroke, measure the ram pressure (usually 15.2 cm from the front end of the stroke).

(4) If the pressure measured in step (3) is less than the predetermined pressure P ₃ (where P ₃ is closed pressure and less than P ₁ ), skip step (2) by not adjusting the inward chopper. .

(5) The ram pressure is measured between the minimum and ultimate minimum practicable interval of the forward ram motion (this is measured starting from the point where the ram enters the compression band).

(6) Adjust the limiters outside the predetermined distance when any ram pressure measured in step 5 is greater than the predetermined pressure P ₂ (where P ₂ is greater than P ₁ ).

1 and 2 show a double barreled pelletized waste feeder in a perspective view and a plan view, respectively, which constitute the invention claimed in my U.S. Patent Application No. 675934 mentioned above.

The mechanism consists of two identical and parallel cylindrical tubes 1 and 1 'where waste is fed from the common hopper 3 through feed inlets 4 and 4' located at the top of each tube 1 and 1 '. do.

The trash enters the tube and stays in it with the aid of the rotor blade 5. Tubes 1 and 1 'consist of a number of bordered sections of steel piping bolted in a conventional manner to one another.

The edges of the tubes 1 and 1 'are bolted to hydraulic cylinders 2 and 2', which lead to axially aligned rams (not shown) in the respective tube feed ends. The perimeter of each ram is in sliding contact with the inner surface of each tube.

Each ram can apply more than 80.3kg / ㎠ pressure to the waste in the tube so that the waste can be compressed to a density of at least 320kg / ㎠ and the compressed waste can be pushed through the tube and out of outlets 6 and 6 '. It can be pushed out.

The pelletizing mechanism is supported by the lower frame 7, on which the pelletizing apparatus is firmly fixed as a plurality of supports 8. Rotary blade 5 is guided by a conventional induction device 9.

Garbage dehydrators 10 and 11 are located near the bottom end of the tube. Variable interrupter assembly 12 constitutes the end portions of tube 1 and 1 ', respectively, which are described in more detail in FIG. The outlet end of the interrupter assembly 12 is in communication with the discharge conduit 13 whose diameter is larger than the diameter of the tube 1.

A flexible sleeve 15 surrounds the tubes 1 and 1 'to connect the furnace's feed port and housing 16 to seal the vapor-tight seal between the pelletizer and the furnace, which closes the front end of the pellet unit. . In addition to the interrupter assembly 12, the dehydrators 10 and 11 are located inside the leak-tight seal 16 to prevent the gases from leaking into the atmosphere. The closet 16 is equipped with a drain plug 17, through which the accumulated liquid can be periodically released through an appropriate valve or continuously through an appropriate water lag. For safety, a rupture diaphragm 18 is provided on top of the trough 16.

Although any form of power plant, such as a hydraulic pump or electric motor, can be used to drive the ram, cylinders 2 and 2 'are preferably powered by a single hydraulic power unit.

The two parallel tubes operate tandem. When the ram in one pelletized tube moves backwards, the other moves forward, so they are always about 180 ° out of phase.

This correlation allows common feed hoppers, rotor blades, and hydraulic power systems to be shared, thereby significantly reducing the cost and complexity of the machinery.

4 shows a preferred embodiment of the restrictor assembly. Chopper Assembly 12 is made of tube 1, 61 cm long, with an inner diameter of 33 cm. The restrictor assembly 12 consists of eight movable limiter sheets, which together constitute the restrictor device. Each thin plate 38 is cut from the section 50 of tube 1 to form a flat seam of the tube inner wall.

The hinge to the sheet 38 can be made by mulling eight grooves 25 around the outer surface of the tube section 50. The same number of grooves (not shown) are provided around the inner surface of the small holes 25 facing the steel tube, the grooves being parallel to each other and leaving only a thin flexible portion 28 of the original tube thickness. Multiple parallel cuts 29 and 30 are axially lowered through the tube section 50 to the ends of the flexible section 28 to form a thin plate 38.

Since the thin sections 28 are flexible, the sheets can move freely radially in and out, exerting a force on their downward ends.

Importantly, each of the cut pairs 29 and 30 and, consequently, each of the edge pairs of the thin plate 38 is in equilibrium with one another. This is necessary to ensure that the space between each sheet and the stop 31 left between each sheet is not changed when the lower end of sheet 38 moves in and out.

This constant space avoids the packing of rubbish and the mechanical failure caused by a radial cut.

Cutting the thin plate 38 from the tube section 50 leaves eight cut conical sections 31 between the thin plates. These parts 31 remain an integral part of the tube part 50. The manner in which the plates 38 move in and out can be seen in Figure 4. Eight block sets are firmly fixed to the bottom of each sheet. A pair of links 32 (only one) are pivotally fixed at one end to each side of each block 33 and the other end to the ring 36 via a block 38 securely attached to the ring 36. Sticks. The ring 36 is in slid contact with the ring 36, which is firmly secured to the stop 31 between the thin plates.

Spacers (not shown) are used between the ring 39 and the fixed portion 31 to allow the sheets to move radially outward.

The ring 36 can also be stuck to three nats 34 (only two are visible) in three equally spaced positions around them, the threads being threaded inside.

Threaded rods 35 operate like threads of each nat 34. The rod 35 which is properly rotated by the induction apparatus is fixed so that it cannot move from the left to the right. The rotation of the rod 35 thus causes the ring 36 to move from left to right as in FIG.

The three rods 35 interlock with each other and are driven jointly so that the ring 36 always stays in a plane perpendicular to the axis of the tube 50.

When the ring 36 is moved to the right, it forces the block 33 through the link 32, which in turn forces each of the thin plates 38, causing the plates to move inward in a radial direction.

The ring 36 is pulled to the left by changing the rotational direction of the rod 35 so that the thin plate 38 is pulled out in a radial direction.

The ring 36 is locked (not shown) to prevent the stop ring 39 from rotating relative to the tube portion 50. This will reinforce the blocks 33 and 37 and the link 32 to stay in the proper arrangement.

3 shows diagrammatically how the mechanism of FIG. 1 produces pellets P of fragmented waste.

When some loosely fragmented rubbish R is in front of the ram (41) and cleared by the ram's forward stroke, the wing (not shown) will push the rubbish into the space (42) cleared by the ram. send.

The wing keeps rubbish in space 42 during the time the ram moves from point 0 to point A of the tube. When the ram continues to move to the right, all waste is limited to the volume between points A and B. When the ram moves further to the right, the waste in the tube is compressed further.

When pressed sufficiently firmly against the metal mass S of the compacted waste present on the right side of the newly compacted waste, the entire compressed pillar in the tube will move to the right. The force required to move this material is determined by wall friction and the action of limiter 12 on the tube section C-D. The sum of the frictional forces generated by the wall and the restrictor determines the compression pressure that the Gram exerts on the newly applied waste into the tube.

The pillar of rubbish moving to the right consists of the above mentioned material defined between points B and D of the tube and the material loosely filled in the discharge conduit 13 between points D and E. The dense pellets P released from the end of the conduit at point E will fall into the furnace. Although the compaction process will form a significant bond in the lump of rubbish that constitutes a single stroke of the ram, that is, it will form one metal lump, but there is little binding between successive metal masses or pellets. So when the material is released into conduit 13 at point E, it easily falls off at the interface between each pellet. Thus, in normal steady state operation, each ramstroke will, on average, produce only one pellet of compressed waste discharged from the tube.

The term slug used here refers to lumps of rubbish that are squeezed together by one ram stroke. When slugs are dehydrated under constant pressure over a limited time, they move further down the tube, condensing more, and coming to the end of the tube with a strong pellet.

As mentioned earlier, the compaction of each new piece of waste metal is accomplished by compressing them between the ram and the already downhill slug. Compression pressure is the force required to move the compacted waste pillars (slugs and pellets) under the tube. To adjust this force it is necessary to keep the amount of movement resistance within the desired range. It has been found that for rock solids of a given length, increasing rock force increases the force needed to push the column under the tube. These two factors enable the existence of critical lengths of debris waste.

In other words, it is the length of the lump of trash that is present in the darkened compartment (B-D part) of the tube, and the force required to move the trash is equal to the force used to form the slug. However, this critical length is not constant. Because it has a functional relationship with the garbage characteristics. For example, the critical length is generally shorter for dry trash than for wet trash. It also decreases as the diameter of the tube decreases.

The effect of the phenomena mentioned above is illustrated by considering a pellet device that operates at the desired compression or ram pressure when the trashed pillar is at its “critical length”. The waste will continue to be compressed to the desired force, which is unchanged in conditions. In other words, it is the force that is necessary to send the compressed garbage column under the tube.

But these conditions are not firm. Because the working conditions change even slightly, the conditions will be reversed. For example, if the rubbish becomes more dry and increases wall friction, it will increase the rock strength for the next slug formed.

In other words, this increases the force needed to move the garbage column. Because higher pressing pressures will result in higher wall friction, thereby further increasing the pressing pressure for the next slugs formed. This chain reaction, which increases the pressure, will continue until the machine's capacity is up, and then it will fail.

The increased wall friction described above reduces the critical length of the compacted waste.

The mechanism breaks down because the actual length of the crushed rubbish is larger than its critical length. If the waste being sent is slightly moist, the opposite situation will occur.

In this case the compression pressure will drop gradually until no condensable pellets are formed. In the past, attempts have been made to solve these problems by providing additional kinetic resistance by installing interrupters fixed at or near the outlet end of the tube beyond that caused by wall friction. Such interrupters consisted of one or more objects extending into the tube or reducing the tube diameter at the outlet end.

In terms of adjustment, however, such intermittent mechanisms simply extended the tube length and, in the end, did not solve the problem because of incomplete crimping conditions as described above.

In order to provide a mechanism that works reliably against almost constant changes in composition and water content, the following facts are required when operating with a constant ram stroke. That is, (1) the length of the compression section of the tube should be shorter than the shortest critical length for the material being pelletized.

(2) To maintain the compression pressure in the desired range, a variable resistance to the flow of waste through the tube should be provided with limiters that can be adjusted as conditions change. If the restrictors are open and the cross-sectional area in the restrictor compartment CD is less than or equal to the cross-sectional area of the tube, the crimped compartment length of the tube will be BD (Figure 3), if the restrictors are sufficiently open and wider than the tube diameter. It will be BC when it gives little resistance to the movement of the pellets.

Critical lengths should be determined experimentally for the particular material being pressed.

The term tube generally used in the specification and claims of the present invention refers to a cylinder barrel, ie length X-E in FIG.

However, it should be noted that the tube has six distinctly functional compartments. These are well illustrated in FIG. Compartment X-O is ramsil, compartment O-A is a feed compartment, compartments A-B are compacted compartments, B-C is a compacted compartment, C-D is a restrictor compartment, and D-E is a conduit compartment.

Compartment B-C and C-D, ie compartment B-D, is the compressed portion of the tube. This is the critical length discussed above. The practical effect of the critical length is to fail if the compressed part is longer than the shortest critical length for the crushed waste.

In such cases the waste does not come out of the outlet of the tube, whether or not under pressure. Because increasing pressure only makes the waste that goes into the tube harder. In order to provide condensable pellets, the pelletizing apparatus needs limiters, which must operate without breaking the pellets.

This can be achieved, for example, by constructing limiters as shown in FIG. 3, which forms a smooth joint of the inner surface of the tube, for example from a cylinder to a tapered cone.

In addition, the limits created by the restrictors must be immediately responsive to the change in compression pressure and be variable to ensure that the compression pressure stays within the desired range. To achieve this result, the limiters must be adjusted to open the limiters slightly if they are greater than the ram pressure required to push the compressed waste column through the tube, whereas if the ram pressure is at a predetermined subpressure, If less, the restrictors should be adjusted to close slightly.

If the ram pressure is within the predetermined range, no change in limiter position occurs.

The restrictors are also made to form a cone that extends forward when fully open. In this condition, the restrictors produce less frictional resistance to the stream of waste than straight tubes of equal length.

A preferred system for adjusting the limiters according to the invention is shown well in FIG. The limiters are adjusted after each stroke corresponding to the compression pressure measured during each compression stroke.

If the compression pressure is less than the predetermined value P ₁ , the limiters will be adjusted (closed) to increase the pressure. If the pressure is above the predetermined high pressure P ₂ , the limiters will be adjusted to reduce the steamed pressure.

If the pressure is between P ₁ and P ₂ , no adjustment takes place. If the compression ram is guided by a hydraulic cylinder, the hydraulic pressure induced into the cylinder (ie ram pressure) can be calculated as the compression pressure by multiplying the hydraulic pressure by the ratio of the hydraulic cylinder piston area to the ram surface area.

Hydraulics, mechanical horsepower, and the force needed to push the retracting ram back should be important to get accurate figures. In practice, however, they are nearly constant, so only hydraulic pressure monitors are meaningful.

Curve I in FIG. 5 shows the hydraulic or ram pressure as a function of ram position when the total load of rubbish debris is compressed.

The pressure near point Z is the pressure needed to overcome flow friction and mechanical friction and push the other ram back. The pressure starts to rise at point Z when the trash meets the ram and begins to be compressed. At point M, the force on the compacted material in the tube is sufficient to move the column of rubbish in the tube, and the pressure is almost constant from point M to the shear point B of the ram motion. At ram end point B, the water pressure drops sharply for reversal. The pressure spikes up to the dotted line M-N of the curve represent pressure spikes, which sometimes occur just before the trash column in the tube begins to move. This happens, for example, when the waste contains a large amount of dry paper, which indicates that the static stopping of the waste is greater than the athletic walking.

To determine the limiter adjustment, it is necessary to monitor sufficiently whether pressure spikes occur at any ram position at point N-B or point M-B. However, if the amount of crushed waste is only a small amount, the pressure curve will be like curve II in FIG.

In this case, the low pressure, i.e., P ₁ or less, should not be checked until it closes to the point M ¹ . Thus, it has been found that it is desirable to measure the pressure to determine whether the pressure is below P ₁ as late as possible in the stroke. Preferably, this pressure monitor behavior should start at point Y (which should be about 2.54 cm from the front end of the ram stroke) and stop at point B (the point at which the front end of the ram motion is reached). However, it must be before the hydraulic pressure drops to reverse.

There may be times when there is no waste in the crimp band. In such a case the pressure curve would be equal to curve III in FIG. The pressure rises in this case to near the end of the stroke because the rubbish compressed on the preceding stroke bounces back as the ram retracts, and this rubbish is recompressed at each subsequent ram stroke.

At the point Y where the pressure monitor action for P ₁ begins, one can find that the pressure drops more sharply than before (as shown in curves I and II), which should signal the regulator.

In reality, however, no adjustments were made. Considering this case and taking into account the very small loading conditions when the pressure curve is between curves II and III, the pressure should be monitored at the second point X, which is about 15.2 cm from the front end of the ram stroke.

The regulating system ensures that if the pressure at point X is not above the predetermined pressure P ₃ (lower than P ₁ ), no commercial kin adjustment will be made during that cycle, no matter what the pressure is after the ram passes point X. It is designed.

The location of the point X (close point) and the P ₃ value (closed pressure) should be determined for each application as required. In Fig. _5, the intersection of the vertical line X and the horizontal line P ₃ should be within the owed area between curves IIa and IIIa and as close to curve IIa as possible. Curve IIa shows the minimum increase in feed and the minimum compression pressure at which the in adjustment is made.

If the dashed extension of curve IIa reaches P ₁ before the ram reaches Y position (which is possible if there is sufficient friction), then P ₄ has a viable operating band between curves IIa and IIIa. At the lowest crimp, full automatic operation is possible over a wide range of conditions.

Curve IIa shows the pressure behavior of the non-carrying stroke after the maximum bounce condition. In the case of municipal waste, this maximal backlash can occur when the waste is all dry paper or cardboard and the press is in extreme compression.

It is also necessary to monitor if the pressure is greater than P ₂ to trigger excessive pressure, ie the out of adjustment of the interrupter. However, this case is not as critical as above, and any point can be solved if the ram passes through point A of FIG. 3, which corresponds to point Z of FIG. The pressure P ₂ can be monitored with the possibility of an out of line adjustment between ram movement intervals between XB in FIG. 5, or YB can be monitored as in the case of P ₁ . This latter monitoring behavior can avoid most undesirable adjustments that may be caused by pressure spikes shown by dashed lines MN.

The normal pressures given to P ₁ , P ₂ and P ₃ to make good pellets from municipal waste are 35.1 kg / cm 2, 56.2 kg / cm 2 and 14.1 kg / cm 2, respectively.

An electrical circuit that can be used to perform the adjustment function described above is shown schematically in FIG. For simplicity, the following symbols are used to describe the circuit in FIG.

Limit switch closed from 1LS ram position A to full retraction point (0)

2LS limited switch, open only in full advance.

3LS Limited switch closed from ram position X to full advance point (B).

4LS Limited switch closed from ram position Y to full battery point (B).

Pressure switch open at 1PS-P ₁ .

Pressure switch closed at 2PS-P ₂ .

Pressure switch open at 3PS-P ₃ .

CR regulating relay.

TR-time delay relay.

MF MR-magnetic starter coil, which actuates the forward (MF) and reverse (MR) propulsion of the motor that controls the interrupter.

The operation of the circuit is as follows. The numbers in parentheses indicate the meaning of the numbers in FIG.

The ram causes the relay 1CR (1) to be powered by 1LS (1) and sealed by 2LS and 1CR-2 (2) before reaching the A position when moving forward.

Contact 1CR-1 (3) is closed as the ram progresses and pressure monitoring begins. The switch 3LS (3) is closed at ram position X, and two points are about 15.2 cm from the end of ram motion. At this point (or near the end of the ram running motion) if the pressure is above P ₂ , the timer 2TR will be energized through the closing contact of the 2PS 6. The contact 2TR-2 (8) is immediately closed and activates the magnetic starter coil MR (8), which starts the drive motor (not shown) to open the interrupters. When the RAM opens the front limit switch 2LS (2), the circuit is opened by the 1CR (1).

The relay 1CR stays in a non-powered state because the 1LS (1) is open between the ram position and the fully advanced position from point A. This opens contact 1CR-1 (3) and drops 2TR. After delay 2TR-2 (8) is opened, the interrupter drive is stopped. When 3LS (3) returns to the point just closed at ram position X, if pressure is above P ₄ , pressure switch 3PS (4) is opened and 2CR is not energized. The switch 4LS (3) is closed at ram position Y and the circuit is completed to 1PS via the contact 2CR-1 (3), which is still closed.

If the pressure is lower than P ₁ , the 1PS (3) will close and be powered by 1TR. This closes the chopper as described above when opening it from above. If the pressure stays above P ₁ during the interval between 4LS (3) and the end of the ram motion, no adjustment is made to the interrupter. When 3LS (3) is closed at ram position X and then back to that point, the pressure switch 3PS (4) is closed, 2CR (4) is energized and 2CR-2 (5) when pressure is less than P ₃ Is sealed by. The contact 2CR 3 remains open for the rest of the ram forward.

Despite any pressure generated in this way, any energization of 1TR is prevented. It also prevents the interrupter from closing when not in a golden state.

The pressure monitoring circuits 3-6 act effectively on the ram's forward motion only when the ram passes through the door from ram position X to the end of the forward motion. So no false pressure signals at other times occur.

Note that the instantaneous contact of 2TR-1 (3) and 1TR-1 (6) prevents both time relays from being energized at the same time. If there is a pressure cycle that activates both collectors, only the first motorized circuit will actually work.

Claims (1)

An inlet and discharge end, reciprocating rams arranged axially at the inlet, comprising a cylindrical tube having an outlet at the discharge end, controlling the compression pressure exerted by the waste, thereby The measured ram is measured by measuring the ram pressure during the last minimum interval of ram advancement, with a number of limiters located at the distal end of the tube that can move in or out as each ram moves as the ram pressure required to advance. If the pressure is less than the specified pressure P ₁ , move the limiter inward by the specified distance, measure the ram pressure when the ram is in the closing point during ram forward movement, and the measured pressure is P ₃ (P ₃ is the closed pressure It is smaller than P ₁₎ does not move small, limited to an inside than the ram to measure the ram pressure during the final minimum amount of forward movement side The ram pressure is specified pressure P ₂ (P ₂ is greater than P ₁₎ is greater than the specified distance control system for automatically controlling the amount of waste limited in the waste compression device, characterized in the step of moving a group limit to the outside as much as.

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