JP5323135B2 - Press equipment for consolidation of bulky material pieces with large elastic restoring force - Google Patents

Description

  The present invention relates to a press apparatus for compacting bulky material pieces having a large elastic restoring force such as rice straw, wheat straw, and grass.

Rice straw, wheat straw, pasture, etc. (hereinafter referred to as rice straw, etc.) produced in paddy fields, fields, etc. (hereinafter referred to as paddy fields) are used, for example, as feed for livestock such as cattle. In order to use rice straw etc., it is necessary to transport rice straw etc. from production areas such as paddy fields to areas where livestock are raised. For example, it is often necessary to transport long distances such as rice straw in the northern part of Kyushu and use in the southern part of Kyushu.
Since rice straw is a bulky material, it is compressed and loaded on a vehicle or the like for efficient and low cost transportation. For example, rice straw produced in a paddy field or the like is rolled into a bale by a roll baler in the paddy field or the like. Still, with the compression density of a normal roll bale, for example, only about 4 tons can be loaded on a 10-ton car, and the transportation efficiency is not good.

  Therefore, it has been carried out that a roll bale produced in a paddy field or the like is carried into a compression packaging facility and a further consolidated bale is produced. In the compression packing facility, roll bales are dismantled once, rice straw is cut to 10-20 cm with a roll cutter, and cut rice straw cut into 2-10 cm with a secondary cutter is compressed, packed, and product bale Is manufacturing. In this way, by further reducing the volume of rice straw, for example, 10 tons of rice straw can be loaded on a 10-ton car, improving transportation efficiency and reducing distribution costs.

In addition, as described above, the possibility of removing foreign matters (parts of farm equipment, empty cans, etc.) mixed in the roll bale is increasing by disassembling / chopping / compressing the roll bale in the compression packaging facility. Therefore, product veils manufactured in compression packaging facilities are better in quality than roll veils.
In the case of a normal roll bale, it is necessary to shred the rice straw at the breeding ground and feed the livestock, so it is necessary to provide a dedicated cutter at the breeding ground. However, since the product veil manufactured in the compression packaging facility is shredded, the work at the breeding ground is reduced and the investment of the cutter becomes unnecessary.

Conventionally, a crank press 31 is used to press the cut rice straw that has been chopped (see FIG. 10). The crank press machine 31 uses a crank mechanism. Driving wheels 43 and 45 are driven by a motor 41 to reciprocate a piston 39 via a crankshaft 37. The chopped cut rice straw is supplied from the supply port 33 to the vertical screw conveyor 35.
In the crank press system, the piston 39 is reciprocated once every two seconds, and the cut rice straw is put into the space in the press chamber vacated when the piston 39 is retracted from above by the vertical screw conveyor 35. It is a method that repeats pressing. The conventional crank-type press machine 31 continuously strikes the supplied cut rice straw with the piston 39, and divides it when the bale coming out from the discharge port 47 reaches a predetermined length (for example, about 80 cm). It is formed in the size of one product veil.

  As a prior art document, Patent Document 1 discloses a system for compressing and packing feed crops and the like. In this system, conventionally used roll baler or the like is used as an apparatus for compressing and molding feed crops. Further, cited reference 2 discloses a roll baler.

JP 2009-219485 A JP 2002-360055 A

  When the cut rice straw is pressed, the ease of solidification changes depending on the quality of the rice straw (water level, mud contamination). For example, when there is a lot of moisture or a lot of mud is mixed, the cut rice straw is easily consolidated by pressing. As a result, in the crank press machine 31, it is difficult for rice straw to come out of the press chamber. The veil may become very hard by repeatedly striking the piston 39 in this state. In such a case, the pressure in the press chamber works against the bearing metal connecting the crankshaft 37 and the piston 39 and the gears of the moving wheels 43 and 45, and the crank type press machine 31 main body is often worn out or damaged. It has occurred.

  In addition, the vertical screw conveyor 35 for feeding the cut rice straw to the crank press machine 31 is always in operation, but the cut rice straw, which has a low specific gravity and poor fluidity, is unstable because the flow rate is not stable. Is difficult to input. For this reason, when the input amount is temporarily increased, clogging or solidification occurs inside the screw, and the blades, shafts, bearings, etc. of the screw are frequently damaged.

  As a result, although the crank type press machine frequently fails and has a production capacity of about 0.9 t / h, in consideration of the stop time due to the failure, only about 0.5 t / h can actually be produced.

  In addition, the conventional crank type press presses the supplied cut rice straw continuously with a piston, and divides it when the bale that comes out reaches a predetermined length (for example, about 80 cm). The product is formed into a veil size. Considering handling, the target weight is about 20kg per product bale. However, since it is divided based on the length of the bale, there is a difference in the weight of the bale if the density of the bale is different. End up. When the water content of rice straw is high (around 25%) or when mud is mixed, the bale is hard, dense and heavy, and the weight per product bale may be 30 kg or more. Conversely, when the water content of rice straw is low, the bale is soft and has low density and low weight, and the weight per product bale may be 15 kg or less. Thus, there is also a problem that the weight per product bale is not constant.

  Therefore, an object of the present invention is to provide a press apparatus that can supply a product bale of a certain quality with few failures and high production efficiency.

In order to solve the above problems, the present invention provides a press device for compacting a bulky material piece having a large elastic restoring force. The press device includes a supply hopper that supplies the bulky material piece, and a bulky material that is supplied from the supply hopper. A prepress chamber for receiving a piece of material, a hydraulic prepress apparatus for compressing a bulky material piece in the prepress chamber, a main press chamber for receiving a bulky material piece from the prepress chamber, and a bulky material piece compressed in the prepress chamber There is provided a press device including a transfer device for transferring to a hydraulic press and a hydraulic press device for compressing bulky material pieces in the press chamber.
Here, the present invention can be applied to any bulky material having a large elastic restoring force, such as rice straw, wheat straw, and grass.

  In another embodiment of the present invention, the pre-press device includes a first hydraulic cylinder having a pressing portion at the rod-side tip, and the press device includes a second hydraulic cylinder having a pressing portion at the rod-side tip, The first hydraulic cylinder preferably has a smaller load, a longer stroke, and a higher moving speed than the second hydraulic cylinder.

  In another embodiment of the present invention, the transfer device is a hydraulic transfer device including a third hydraulic cylinder having a pressing portion at a rod side tip, and the transfer device transfers a bulky material piece from the prepress chamber to the press chamber. Can be transported and compressed.

  In another embodiment of the present invention, the press device further includes a fourth hydraulic cylinder having a pressing portion at the rod-side tip, and extends the third hydraulic cylinder and retracts the fourth hydraulic cylinder, thereby A bulky material piece compressed in the room is discharged.

  In another embodiment of the present invention, the supply hopper and the prepress device are connected, and the supply hopper and the prepress device can move with respect to the prepress chamber, and either the supply hopper or the prepress device is a prepress. It is positioned to operate with respect to the chamber.

  In another embodiment of the present invention, a damper is provided at the outlet of the supply hopper, and the bulky material pieces in the supply hopper are supplied into the prepress chamber at a time by opening the damper.

  In another embodiment of the present invention, the main body of the supply hopper is preferably a rectangular parallelepiped.

  In another embodiment of the present invention, the supply hopper is preferably equipped with a scale for measuring the weight of the bulky material piece.

  According to a second aspect of the present invention, in a method for operating a press apparatus for compacting a bulky material piece having a large elastic restoring force, the method includes a step of feeding the bulky material piece accommodated in a supply hopper to a pre-press chamber. A step of compressing the bulky material piece in the prepress chamber with a hydraulic prepress device, a step of transporting the bulky material piece compressed in the prepress chamber to the press chamber with a transfer device, and a bulky material piece in the press chamber. And a method of operating the pressing device, comprising the step of compressing by the hydraulic press device.

  In another embodiment of the present invention, the pre-press device includes a first hydraulic cylinder having a pressing portion at the rod-side tip, and the press device includes a second hydraulic cylinder having a pressing portion at the rod-side tip, The first hydraulic cylinder can be operated with a smaller load, longer stroke, and higher moving speed than the second hydraulic cylinder.

  In another embodiment of the present invention, the transfer device is a hydraulic transfer device including a third hydraulic cylinder provided with a pressing portion at the rod-side tip, and the transferring step includes transferring the bulky material piece from the prepress chamber to the main press. It can be transferred to the chamber and compressed.

  In another embodiment of the present invention, the pressing device further includes a fourth hydraulic cylinder provided with a pressing portion at the rod side tip, and the operating method further includes a step of discharging a bulky material piece compressed in the press chamber. Including and discharging, the bulky material piece can be discharged by extending the third hydraulic cylinder and retracting the fourth hydraulic cylinder.

  In another embodiment of the present invention, the discharge opening of the supply hopper is provided with a damper, and the supplying step supplies the bulky material pieces in the supply hopper to the prepress chamber at a time by opening the damper. Can do.

  In another embodiment of the present invention, a bulk material piece for subsequent compaction can be accommodated in the supply hopper between the step of compressing by the prepress device and the step of compressing by the press device. .

  In another embodiment of the present invention, the supply hopper can accommodate a bulk material piece of a predetermined weight.

  By adopting the above-described configuration of the present invention, the failure of the press machine is reduced, the production efficiency is improved, and a product veil having a constant quality can be supplied.

It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is a figure which shows the manufacturing process of the hydraulic press machine of this invention. It is the schematic of the conventional crank type press.

1 to 9 show a product bale process of the hydraulic press according to the present invention.
First, with reference to FIG. 1, the structure of the hydraulic press machine 1 by the Example of this invention is demonstrated. A temporary storage hopper 3 for storing the chopped cut rice straw 2 is provided upstream of the hydraulic press machine 1 in the processing step. The cut rice straw supplied from the temporary storage hopper 3 is transferred to the supply hopper 7 of the hydraulic press 1 by the belt conveyor 5.

  The hydraulic press apparatus 1 includes a supply hopper 7 that supplies cut rice straw, a prepress chamber 10 that receives cut rice straw supplied from the supply hopper 7, and a hydraulic prepress that compresses the cut rice straw in the prepress chamber 10. An apparatus 13, a main press chamber 28 for receiving cut rice straw from the prepress chamber 10, a transfer device 21 for transferring the cut rice straw compressed in the prepress chamber 10 to the main press chamber 28, and a cut rice straw in the press chamber And a hydraulic press device 17 for compressing the pressure.

  The prepress device 13 includes a first hydraulic cylinder 14 provided with a pressing portion 15 at the rod side tip. The press device 17 includes a second hydraulic cylinder 18 provided with a pressing portion 19 at the rod end. The first hydraulic cylinder has a smaller load, a longer stroke, and a higher moving speed than the second hydraulic cylinder.

  The transfer device 21 includes a third hydraulic cylinder 22 having a pressing portion 23 at the rod side tip. The transfer device 21 transfers the cut rice straw from the prepress chamber 10 to the main press chamber 28 and compresses it.

  The hydraulic press apparatus 1 further includes a fourth hydraulic cylinder 26 provided with a pressing portion 27 at the rod side tip. By extending the third hydraulic cylinder 22 and retracting the fourth hydraulic cylinder 26, the cut rice straw compressed in the press chamber 28 is discharged.

  The supply hopper 7 and the prepress device 13 are connected. Further, the supply hopper 7 and the prepress device 13 can move with respect to the prepress chamber 10. Then, either the supply hopper 7 or the prepress device 13 is positioned at a position where it operates with respect to the prepress chamber 10.

A damper 11 is provided at the discharge port of the supply hopper 7. By opening the damper 11, the cut rice straw in the supply hopper 7 is supplied into the prepress chamber 10 at a time.
The main body of the supply hopper 7 has a rectangular parallelepiped shape. In addition to the rectangular parallelepiped shape, a shape such as a truncated cone extending downward is also applicable. Any shape can be applied if the cut rice straw is sure to fall downward when the damper is opened.
The supply hopper 7 is provided with a weigh scale for measuring the weight of the cut rice straw. It is also possible to measure the weight of the cut rice straw at another location and supply the cut rice straw to the supply hopper 7. In this case, the supply hopper 7 may not be provided with a weight scale.

FIG. 1 shows a starting state of the machining process. In the supply hopper 7, cut rice straw for one product bale is accommodated. The supply hopper 7 is positioned above the prepress chamber 10. In the drawings, both a front view and a partial side view are shown. The positional relationship between the supply hopper 7, the prepress device 13, and the prepress chamber 10 can also be understood from the partial side view at the upper left of the drawing.
The state shown in FIG. 1 is a time 0 state. Hereinafter, each process will be described with reference to the elapsed time for reference.

  The cut rice straw shredded by the roll cutter is stored in the temporary storage hopper 3. The cut rice straw is transferred from the temporary storage hopper 3 to the supply hopper 7 by the belt conveyor 5. A weigh scale is installed in the supply hopper 7 so that the belt conveyor 5 automatically stops when the rice straw reaches a certain amount (for example, 20 kg).

  The supply hopper 7 can be moved by an air cylinder from the receiving position for receiving the cut rice straw from the belt conveyor 5 to the discharging position above the prepress chamber 10.

  FIG. 2 shows a state where the damper 11 of the supply hopper 7 is opened. The damper 11 is opened for about 3 seconds. By opening the damper 11, the cut rice straw in the supply hopper 7 falls into the prepress chamber 10. The prepress chamber 10 is defined by a prepress chamber frame 9.

  Unlike the conventional continuous feeding method using a screw conveyor, in the present invention, the cut rice straw stored in the supply hopper 7 is fed into the prepress chamber 10 at a time. This solves the problem of failure such as clogging of cut rice straw in the screw conveyor at the time of loading and breakage of blades, shafts, bearings, etc. of the screw conveyor.

  In addition, rice straw has a low specific gravity, and if it is shaped like a normal hopper, the cut rice straw will form a bridge in the hopper and will not fall. Therefore, it becomes difficult to drop and put the cut rice straw for one bale into the prepress chamber 10 at a time. Therefore, by making the supply hopper 7 into a rectangular parallelepiped shape, the cut rice straw can be dropped into the prepress chamber 10 at a time when the damper 11 is opened.

  Subsequently, as shown in FIG. 3, the damper 11 of the supply hopper 7 is closed. The damper 11 is closed for about 1 second (cumulative elapsed time 4 seconds).

  Subsequently, as shown in FIG. 4, the supply hopper 7 is moved to the original receiving position by the air cylinder, and the prepress device 13 is positioned above the prepress chamber 10. The time required for this step is about 3 seconds (cumulative elapsed time 7 seconds).

  Subsequently, as shown in FIG. 5, the cut rice straw in the prepress chamber 10 is compressed by the prepress device 13. The time required for this step is about 4 seconds (cumulative elapsed time 11 seconds). Then, the cut rice straw for producing the next bale starts to be fed into the supply hopper 7 moved to the receiving position.

  Then, as shown in FIG. 6, the cut rice straw is transferred from the prepress chamber 10 to the main press chamber 28 by the transfer device 21, and the cut rice straw is compressed in the horizontal direction. The time required for this step is about 4 seconds (cumulative elapsed time 15 seconds). The rod side tip pressing portion 23 of the third hydraulic cylinder 22 and the rod side tip pressing portion 27 of the fourth hydraulic cylinder 26 form a part of the main press chamber frame of the main press chamber 28. In the present embodiment, the first stage of the piston rod on the pressing portion 23 side of the third hydraulic cylinder 22 extends in this step.

  Subsequently, as shown in FIG. 7, the cut rice straw in the press chamber 28 is compressed by the press device 17. The time required for this step is about 17 seconds (cumulative elapsed time 32 seconds). During this process, the first hydraulic cylinder 14 of the prepress device 13 moves backward.

  Subsequently, as shown in FIG. 8, the fourth hydraulic cylinder 26 moves backward, and at the same time, the third hydraulic cylinder 22 further extends to move the cut rice straw to the payout position. In this step, the second stage of the piston rod on the pressing portion 23 side of the third hydraulic cylinder 22 extends. The time required for this step is about 7 seconds (cumulative elapsed time 39 seconds). During this process, the supply hopper 7 containing the next bale of cut rice straw moves to the upper part of the prepress chamber 10.

  Subsequently, as shown in FIG. 9, the cut rice straw is transferred to the next packing device (not shown). Then, the fourth hydraulic cylinder 26 returns to the original position, and the third hydraulic cylinder 22 also returns to the initial position. The time required for this step is about 6 seconds (cumulative elapsed time 45 seconds).

  Subsequently, as shown in FIG. 2 again, the damper 11 of the supply hopper 7 is opened, and the steps of FIGS. 3 to 9 are repeated again to manufacture the next bale.

The compressed cut rice straw is transferred to the next packing apparatus by a conveyor or the like while being restored. Thereafter, the product veil is completed by packaging with a poly sheet or the like and binding with a PP band or the like.
The compressed cut rice straw swells gradually due to the restoring force. When the pressing pressure is weak, the pressing time is short, or the straw shredding length is long, the restoration becomes large. In addition, the restoration gradually increases with time after pressing. The hydraulic press of the present invention sets the press pressure and the press time in consideration of restoration so that the rice straw bale of a predetermined size can be processed.

  In the present invention, a hydraulic press system is adopted. This is because the hydraulic pressure can generate a large pressing pressure. Furthermore, since the press pressure is constant, the hydraulic press system has an effect of avoiding caking as much as possible due to high moisture in high-pressure straw or a lot of mud being mixed, and preventing the failure of the apparatus due to it.

In one embodiment of the present invention, the press pressure is set as follows.
Pre-press device (first hydraulic cylinder): about 30t
Transfer device (horizontal prepress device) (third hydraulic cylinder): about 38.5 t
This press machine (second hydraulic cylinder): about 245t
As described above, the vertical and horizontal pre-press devices are set to move fast with a weak load, and the press device is set to move slowly with a strong load.

In one embodiment of the present invention, the following time was measured in an actual test.
Prepress device: Travel time: 3.8 seconds Transfer device: Travel time: about 4.2 seconds This press device: Travel time: 6.4 seconds + Pressurization holding time: 7.7 seconds Time to hold is provided. Without this holding time, the recovery of the cut rice straw becomes strong and it becomes difficult to make the bale into a predetermined shape. It is also possible to provide a pressure holding time for the prepress device or the transfer device. Moreover, the length of pressurization holding time can be adjusted suitably.

There are mainly two reasons why the present invention uses the pre-press and the multi-stage compression of the press.
First, it is for shortening the distance and time which the 1st hydraulic cylinder of this press apparatus which applies the maximum pressure moves. The specific gravity of the rice straw is very light and about 30kg / m ^3, when you try to press one minute bale (about 20 kg) at a time, the raw material rice straw piston rod of the hydraulic cylinder due to the large volume of moving a long distance It must take time. Therefore, the initial press that does not require much pressure is performed separately from this press, and this press is performed only for the stage that requires the maximum pressure. As a result, the entire process time is shortened, and at the same time, the time for the press is sufficiently secured. As a result, the manufacturing efficiency is improved.
Secondly, by separating the main press and the prepress, other operations can be performed in parallel. As described above, during the process of this press or the like, preparations for feeding the next raw rice straw into the pre-press room are performed in parallel. As a result, the manufacturing efficiency is improved.

  Furthermore, since rice straw has a strong restoring force, unless a considerable pressure is applied by a hydraulic press, the rice straw expands and cannot be veiled, and a product bale having a uniform density cannot be produced. By using multiple stages of compression, the pressure holding time at the time of this press can be sufficiently secured, so that the bale is sufficiently compressed, the density of the product veil is made uniform, and the quality is improved.

  The actual test confirmed that the hydraulic press of the present invention operated well without a failure stop frequently occurring in the conventional crank press, and had a production capacity of about 1.5 t / h. . It was confirmed that the production efficiency of the conventional crank type press machine was extremely improved as compared with the fact that the conventional crank type press machine had a production capacity of only 0.5 t / h in consideration of the stop time due to failure.

DESCRIPTION OF SYMBOLS 1 Hydraulic press machine 2 Cut rice straw 3 Temporary storage hopper 5 Belt conveyor 7 Supply hopper 9 Prepress frame 10 Prepress chamber 11 Damper 13 Prepress device 14 1st hydraulic cylinder 15 Press part 17 This press device 18 2nd hydraulic cylinder 19 Press part DESCRIPTION OF SYMBOLS 21 Transfer apparatus 22 3rd hydraulic cylinder 23 Press part 26 4th hydraulic cylinder 27 Press part 28 This press chamber 31 Crank type press 33 Supply port 35 Vertical screw conveyor 37 Crankshaft 39 Piston 41 Motor 43, 45 Driving wheel 47 Discharge port

Claims (15)

In a pressing device for consolidation of a bulky material piece having a large elastic restoring force, the pressing device comprises:
A supply hopper for supplying the bulky material piece;
A prepress chamber for receiving the bulky material piece supplied from the supply hopper;
A hydraulic prepress device for compressing the bulky material piece in the prepress chamber;
A main press chamber for receiving the bulky material piece from the prepress chamber;
A transfer device for transferring the bulky material piece compressed in the prepress chamber to the main press chamber;
Look including a hydraulic this press device for compressing the bulk material pieces of the present press chamber,
The transfer device is a hydraulic transfer device including a third hydraulic cylinder having a pressing portion at a rod side tip, and the transfer device transfers the bulky material piece from the prepress chamber to the main press chamber and compresses it. And
The press device further includes a fourth hydraulic cylinder having a pressing portion at a rod-side end, and the third hydraulic cylinder is extended and the fourth hydraulic cylinder is retracted to be compressed in the main press chamber. A press apparatus for discharging the bulky material piece . The prepress device includes a first hydraulic cylinder provided with a pressing portion at a rod side tip,
The present pressing device includes a second hydraulic cylinder provided with a pressing portion at a rod side tip,
The press apparatus according to claim 1, wherein the first hydraulic cylinder has a smaller load, a longer stroke, and a higher moving speed than the second hydraulic cylinder. The supply hopper and the prepress device are connected, and the supply hopper and the prepress device can move with respect to the prepress chamber, and either the supply hopper or the prepress device is the prepress chamber. The press device according to claim 1, wherein the press device is positioned at a position where the press device operates relative to the press. In a pressing device for consolidation of a bulky material piece having a large elastic restoring force, the pressing device comprises:
A supply hopper for supplying the bulky material piece;
A prepress chamber for receiving the bulky material piece supplied from the supply hopper;
A hydraulic prepress device for compressing the bulky material piece in the prepress chamber;
A main press chamber for receiving the bulky material piece from the prepress chamber;
A transfer device for transferring the bulky material piece compressed in the prepress chamber to the main press chamber;
A hydraulic book press device for compressing the bulky material piece in the book press chamber,
The supply hopper and the prepress device are connected, and the supply hopper and the prepress device can move with respect to the prepress chamber, and either the supply hopper or the prepress device is the prepress chamber. A pressing device adapted to be positioned in a position to act on. The prepress device includes a first hydraulic cylinder provided with a pressing portion at a rod side tip,
The present pressing device includes a second hydraulic cylinder provided with a pressing portion at a rod side tip,
The press apparatus according to claim 4, wherein the first hydraulic cylinder has a smaller load, a longer stroke, and a higher moving speed than the second hydraulic cylinder. The transfer device is a hydraulic transfer device including a third hydraulic cylinder having a pressing portion at a rod side tip, and the transfer device transfers the bulky material piece from the prepress chamber to the main press chamber and compresses it. The press device according to claim 4 or 5. The press device further includes a fourth hydraulic cylinder having a pressing portion at a rod-side end, and the third hydraulic cylinder is extended and the fourth hydraulic cylinder is retracted to be compressed in the main press chamber. The press apparatus according to claim 6, wherein the bulky material piece is discharged. Wherein the outlet of the supply hopper is provided with a damper, the bulky piece of material in the feed hopper by opening the damper is supplied at a time to the prepress chamber, claims 1 to 7 The press apparatus as described in any one of these. The press apparatus according to any one of claims 1 to 8 , wherein the main body of the supply hopper has a rectangular parallelepiped shape. The press apparatus according to any one of claims 1 to 9 , wherein the supply hopper is provided with a scale for measuring the weight of the bulky material piece. In the operation method of the press device for consolidation of a bulky material piece having a large elastic restoring force, the method comprises:
Supplying the bulky material pieces housed in a supply hopper to a pre-press chamber;
Compressing the bulky piece of material in the prepress chamber with a hydraulic prepress device;
Transferring the bulky material piece compressed in the prepress chamber to the press chamber by a transfer device;
Look including the step of compressing the bulk material pieces of the present press chamber by hydraulic this press device,
The transfer device is a hydraulic transfer device including a third hydraulic cylinder having a pressing portion at a rod-side tip, and the transferring step transfers the bulky material piece from the prepress chamber to the main press chamber. Compress with
The press device further includes a fourth hydraulic cylinder having a pressing portion at a rod side tip, and the operation method further includes a step of discharging the bulky material piece compressed in the press chamber, and discharging the same. The step is an operation method of a press device , wherein the bulky material piece is discharged by extending the third hydraulic cylinder and retracting the fourth hydraulic cylinder . The prepress device includes a first hydraulic cylinder provided with a pressing portion at a rod side tip,
The present pressing device includes a second hydraulic cylinder provided with a pressing portion at a rod side tip,
The operation method of a press apparatus according to claim 11 , wherein the first hydraulic cylinder is operated with a smaller load, a longer stroke, and a higher moving speed than the second hydraulic cylinder. Wherein the outlet of the supply hopper is provided with a damper, wherein the supplying step supplies a time the bulk material pieces within the feed hopper by opening the damper to the prepress chamber, claim 11 Or the operating method of a press apparatus as described in Claim 12 . Until the step of compressing by the present press apparatus the step of compressing by the prepress device is completed, to accommodate the bulky piece of material for subsequent compaction to said feed hopper, claims 11 to claim 13 The operation | movement method of the press apparatus as described in any one of these. The operation method of the press apparatus according to any one of claims 11 to 14, wherein the bulk material piece having a predetermined weight is accommodated in the supply hopper.