WO2009112640A1

WO2009112640A1 - Method and apparatus for sod peat production

Info

Publication number: WO2009112640A1
Application number: PCT/FI2009/050196
Authority: WO
Inventors: Seppo Patana; Juha Niemiaho
Original assignee: Seppo Patana; Juha Niemiaho
Priority date: 2008-03-13
Filing date: 2009-03-12
Publication date: 2009-09-17
Also published as: EE05635B1; RU2492325C2; FI20080205A0; CA2716955A1; FI20106034A; FI122711B; FI20080205L; EE201000072A; FI20090006A0; SE1051063A1; SE534635C2; RU2010139978A

Abstract

A sod peat production method comprising winning sod peat from a peat production field. The method comprises conveying the just won sod peat 5 to a sod peat field stack including one or more layers of sod peat such that the just won sod peat is conveyed on top of previously won and naturally dried sod peat.

Description

METHOD AND APPARATUS FOR SOD PEAT PRODUCTION

FIELD

The invention relates to a method and apparatus for sod peat production.

BACKGROUND

Current sod peat production methods suffer from the disadvantage of having a plurality of separate working phases, which make the winning slow and laborious. Traditionally, the produced peat is spread on the peatland. To speed up the drying process, the sod peat is turned and windrowed several times, and finally the windrowed sod peat is loaded up for transportation.

Traditional known tractor-fed sod peat winning machines consist of a frame attached to the working machine with three-point mooring. To this frame a cover pipe is attached and a winning screw positioned therein or a combination of a screw and a disk miller is provided. The peat is pressed through output pipes or nozzles. The power supply for the machines has usually been arranged mechanically and/or hydraulically.

Disadvantages of the known sod peat winning process usually include a great energy need, complicated production process and interruptions in the sod peat machines due to obstructions. Additionally, problems are caused by the operational unreliability of the complicated machines and the inconvenience and expensiveness of the service actions.

Wastage in usual sod peat production is high, that is about 20 to 50% due to the number of working phases (see VTT news-sheet 2045 - properties of the fuel used in Finland, and patent publication Fl 106060). The sig- nificant wastage is caused by breaking the material in the several turning and windrowing phases and also the fact that rootstocks, stones and fines mix with the sod peat. Therefore, the peat, such as sod peat, needs to be screened several times. The biggest foreign material cannot even be screened but needs to be removed from the peat manually. What adds to the inefficiency of current peat production methods is the fact that the work phases are carried out during the best harvesting time and the next harvesting cycle can only be started after the previous harvest has been collected.

BRIEF DESCRIPTION

It is an object of the present invention to provide a method and an apparatus for implementing the method, in which the above-mentioned disadvantages can be removed, that is, the amount of machines, working phases and wastage can be minimized.

The objects of the invention are achieved by a method and an arrangement, which are characterized by what is stated in the independent claims. The preferred embodiments of the invention are disclosed in the dependent claims.

The invention provides a plurality of advantages. For instance, the usage of milled peat, which has a smaller heat value and energy density than sod peat, may, thanks to this invention, be to some extent replaced with the usage of sod peat. The advantages of the invention are undeniable, because the need of total energy consumption, and the number of the machinery needed for the production can be reduced. The great disadvantages, that is, the dust and the fire risk associated with milled peat, may be eliminated almost completely. One big advantage of the present invention is that it will become possible and profitable to utilize smaller harvesting areas due to the smaller size of the machinery and increased efficiency. In this connection it should be noticed that the production of sod peat is not as dependent on weather as the production of milled peat. The present invention further enhances the inde- pendence of the sod peat production of unstable weather conditions. With this invention, the disadvantages associated with the current peat production methods can be significantly reduced or completely eliminated.

The present invention reduces significantly the number of production steps, such as turning, windrowing and screening, the total energy con- sumption, the energy consumption used to the winning process, and the time used for winning per energy unit. On the basis of successful drive tests carried out on a prototype, the sod peat winning process can be renewed and simplified. The smoothness of the winning process, total efficiency and friendliness to the environment will improve significantly. Due to what has been said above, the economic competitiveness of sod peat will rise to a new level when com- pared to other forms of energy, and without substantial support from the society.

DRAWINGS

In the following the mode of operation according to the invention is explained first generally and then in more detail by means of the attached drawings, in which

- Figure 1 presents a sod peat winning machine according to the invention;

- Figure 2 shows a winning screw, bearing, and the structure of the rotating claws; - Figure 3 shows the structure of a winning pipe, output pipes and an emptying hatch;

- Figure 4 shows the structure of hydraulic cleaning and opening tubes, and the cutting device and its attachment;

- Figure 5 highlights the method made possible by the device; - Figure 6 shows an embodiment of a grate roll;

- Figure 7 shows an embodiment of a method; and

- Figure 8 highlights the execution of the method.

DESCRIPTION OF SOME EMBODIMENTS

Peatland selected for peat production is first cleared from trees, stocks and visible stones. Peat is lifted from a bog by using a screw that draws the peat into the winning pipe at an even flow rate. At the other end of the screw, a counter-thread is provided to reduce pressure and wearing at the back end of the winning pipe. In this way, the working pressure is transferred to and formed at the output pipes of the peat. Inside the winning pipe spiral blades are provided which together with the outer edge of the rotating screw crush possible branches and twigs before they reach the peat output pipes. For additional security, at the position of each output pipe, emptying claws may be fastened to the axle of the winning screw. The emptying claws have the task to preventing any waste entering the output pipes. However, if for some reason, waste obstructs the output pipes, the hydraulically operating opening and cleaning tubes are steered into the output pipes to clean the output pipes from any obstructions. The solid opening and cleaning tubes may push the obstructing material away from the inside of the output pipe back to the direction of the screw. At the same time, when the opening and cleaning tubes are about to enter into the output pipes, an emptying hatch is opened at the counter-side of the output pipes, which makes it possible for the waste to exit the device via the emptying hatch.

The emptying claws rotating inside the winning pipe ensure that the remaining waste will exit through the emptying hatch. The output pipes may be cleaned such that the driver does not need to leave the tractor cabin and stop the winning process.

The winning pipe is also bearing-mounted at its front end, which extends the lifetime of the sod peat apparatus. An attachment frame of the bearing prevents rootstalks and stones entering the winning screw. The attachment frame of the bearing also operates as a steering slide, when the apparatus projects into the working depth and traverses therein. Then, it also prevents the apparatus from suffering damages when running into obstacles.

The pressed sod peat exiting through the output pipes may be cut by a cutting device to desired length and dropped onto a belt conveyor or the like, which then transfers the pieces to an appropriate distance from the winning machine to a sod peat field stack. This process ensures that even from small areas, sod peat can be won multiple times in comparison with the present winning methods. In addition, this new field stack method significantly speeds up the production of the sod peat and improves the quality. In this method, the sod peat does not need to be turned and windrowed at all on the field containing fines and impurities. In this method, the sod peat pieces are produced as layers directly to the sod peat field stack. On top of the first produced/won and already naturally dried sod peat layer, a new layer of sod peat is set until an airy and fast-drying clean sod peat field stack is ready. Thus the pieces of sod peat remain on top of each other and dry completely without any windrowing and turning phases. That is why all screening phases are also avoided as no foreign material is mixed to the sod peat. By means of this invention, the sod peat may be transferred at the beginning of the winning process to a sod peat field stack, which is thus achieved with only one working phase and machine. Compared with the traditional winning method, several working phases are avoided as unnecessary. With this invention, sod peat is produced directly to a plurality of overlapping layers and the field stack thereby formed may then preferably be directly collected to wheels by using a loader and transported to the closest stock pile or a burning plant. This new production method thus only includes two working phases, that is, production of the piece directly to a field stack and loading of the pieces to a transport device.

Figure 1 shows an embodiment of a sod peat winning machine according to the invention, wherein a winning or cover pipe 2 is attached to a steel beam frame 1 , and wherein inside the winning pipe 2 is arranged a bearing-mounted winning screw 3. The pipe has two functions. On one hand, it covers the screw and thereby protects it from stone hits, for instance. On the other hand, the pipe co-operates with the screw in such a way that the winning pipe determines the space wherein the winning screw can rotate and prevents the peat from falling away from the screw. At the lower end of the winning tube, there is provided a bearing attachment and a protection frame 4, which also operates as a guide slide that protects the screw 3 from damages.

The winning pipe 2 is assembled to the steel frame 1 at an angle of about 35 degrees with respect to the ground. At the lower end of the winning pipe 2, an additional hatch 5, open able with a hydraulic cylinder, is provided to boost the feeding of the peat to the screw 3, if needed. At the other end of the winning screw 3, gearing 6 is mounted to transfer the needed power to the winning screw 3. The axle of the winning screw is provided with a roll-chain cogwheel joint 7, which improves the endurance of the axle. The power coming to the gearing 6 is preferably transferred with an articulated shaft 8 from the power source such as a tractor.

Hydraulically operating opening and cleaning tubes 9, the emptying hatch 10 and the additional hatch 5 may be controlled from the cabin of the tractor. A bearing-mounted cutting device 11 operates automatically with the kinetic energy of the sod peat. That is, the cutting device may include a few blades that are arranged at a certain angle with respect to each other into a rotating structure. As the sod peat arrives from the output pipes, it pushes one of the blades of the cutting device, which causes the cutting device to rotate and thereby the next blade to cut the sod peat. Sod peat pieces are typically 50 to 200 mm long and have a diameter of 40 to 80 mm. The length of the pieces can be adjusted by changing the number of blades in the cutting device and the diameter of the pieces by using output pipes having different inner diameters. A belt conveyor 12 or the like is preferably attached under output pipes 13 and the cutting device 11 by means of two horizontal pins 14, of which one is provided with a hinged vertical pin. By means of the hinged vertical pin, the conveyor can be turned aside and locked during road transportation. The height of the exit end of the conveyor is adjusted with a winch 15 and an attachment backstay 16. In this way, the sod peat pieces can be vertically guided to the desired location. Guidance of the pieces in the longitudinal direction can be improved by providing the conveyor with a triangle plate or similar. The belt conveyor may be provided with steering lamels, whereby the sod peat pieces exiting the output pipes are distributed evenly on the conveyor. By means of the lamels, the pieces keep the right track on the belt conveyor. Thereby the pieces can be distributed evenly on the sod peat field stack.

The use of the belt conveyor 12 prevents mixing waste from the bog with the sod peat as the sod peat is directly put as layers to a place from which it is loaded up. There is thus no need to turn, windrow and screen the sod peat on the bog field that contains impurities. Impurities, such as stones and root- stocks, traditionally deteriorate the energy efficiency properties of the sod peat. The winch 15 can be used mechanically or hydraulically. The power source of the conveyor 12 may be a hydraulic motor 17, with which the speed of the conveyor 12 may also be easily adjusted from the cabin, if needed.

Figure 2 shows the structure of the winning screw 3, bearing- mounting and the rotating claws 21 , where the winning screw 3 is bearing- mounted at its both ends to improve the operational reliability and to prevent damaging the screw. The screw 3 consists, as the figure shows, of a grinding blade 18 circumventing the outer edge of the screw 3, a winning thread 19 and its counter-thread 20 and hard-steel claws 21 attached to the axle of the screw 3 and arranged between the thread 19 and the counter-thread 20. When needed, the emptying claws 21 can be provided with mixing wings 22 or the like. Peat entering the winning tube is steered in the non-threaded section under high pressure to the output pipes 13, mixed under the influence of the emptying claws 21 and the mixing wings 22 and pressed through the output pipes 13 to a belt conveyor 12 or the like.

Figure 3 shows the structure of the winning pipe 2, the output pipes 13 and the emptying hatch 10, wherein the winning pipe 2 is provided with output pipes 13, which are mounted at an angle that may be about 35 degrees from the central line of the winning pipe such that the pipes align with the con- veyor 12. The frame-mounting of the output pipes 13 may be fixedly arranged to the winning pipe 2. The frame-mounting pipes are provided with a flange 23, to which output pipe series having different diameters and forms can preferably be attached.

The winning pipe 2 may furthermore be provided with spiral-like hard steel blades 24, which extend to the counter-thread of the winning screw 3 and are fixedly arranged to the inner wall of the winning pipe 2. The blades 24 of the winning pipe 2 and the blade 18 of the winning pipe 2 together grind the waste coming to the winning pipe 2. When an output pipe 13 or output pipes block up, the emptying hatch 10 opens simultaneously by the help of a hydraulic cylinder, when the opening and cleaning tubes 9 start moving towards the output pipes 13. Thus, the material that the opening and cleaning tubes 9 have pushed away from the inside of the output pipes 13, may fall away from the device though the emptying hatch 10.

Figure 4 shows the structure of the opening and cleaning tubes 9 and the cutting device 1 1 and its attachment. The opening and cleaning tubes 9 are preferably fixedly mounted to a steel frame 25 of the control unit, which is capable of moving with the help of a counter-part of the control unit and hydraulic cylinder such that the output tubes 13 can be cleaned and the tubes 9 can be returned to the original position without the driver needing to exit from the tractor cabin and stop the winning process in any way. Practically this may be carried out such that when the driver notices an obstruction in one or more of the output pipes, he may push a control button in the cabin. This causes the emptying pipes 9 to quickly enter into and away from the output pipes 13. This cleaning operation may in practice be so quick that there is no need to stop the winning of the sod peat during the cleaning. The cutting device blade 1 1 is preferably attached to hinges 26 which are attached to the frame 25 of the control unit. When the emptying tubes 9 start moving, the attachment hinges 26 lift the cutting blade 1 1 up such that the emptying tubes 9 can move without obstacles. The cutting device 1 1 is bearing-mounted at its both ends, and it operates on the basis of the kinetic energy of the sod peat. When rotating around its own axis, the cutting blade cuts the sod peat into pieces of desired length before the sod peat falls onto the conveyor. The desired length of the pieces and thus the drying speed of the piece can be adjusted by changing the number of cutting blades and the size or the diameter of the output pipes 13. Figure 5 shows a harvesting method applied to a machine, where the belt conveyor 12 or the like is preferably attached to the frame and under the output pipes and cutting device of the sod peat machine. The length of the belt conveyor may be adjustable. One way to achieve this is to cause the belt conveyor to rotate around three points, whose positions are adjustable with respect to each other. When the maximum length of the conveyor is desired, the three points may be in line. If a shorter conveyor is wanted, the three points may be moved to a form of a triangle. The height of the exit end of the con- veyor can be adjusted during production by help of a winch 15 and an attachment backstay 16. Thus, the sod peat can be guided to a desired location in the field stack.

Alternatively, the length of the conveyor may be fixed. Then the sod peat pieces may be directed from one side of the stack over the apex to the other side of the sod peat field stack when the sod peat machine is close enough to the sod peat field stack.

This invention makes it possible to harvest from the same strip to the same field stack several times such that these several overlapping layers gradually form a dry and clean field stack 27, which can preferably be collected with a loader directly to a transport device and transported to a stock pile or to the usage destination.

Figure 5 shows four layers of sod peat 31 conveyed to the field stack. As the figure shows, the sod peat in the three lowest layers is reduced in size in comparison with the just extracted fourth and highest layer of sod peat. When the sod peat dries, the pieces are moving and spaces are formed between neighbouring pieces in the same layer and between pieces in different layers. Thus, by allowing the sod peat to dry naturally about 3 to 6 days, preferably less than two weeks, before adding a new layer of sod peat to the sod peat field stack, an airy and well-ventilated field stack is obtained.

The base of the sod peat field stack 27 may be formed to have grates 30 that extend transversely with respect to the apex of the field stack. Rainwater may thus run along the grates on the sides of the field stack away from the direction of the apex. This way even the lowest layer of sod peat has good drying conditions even in rainy weather conditions.

Figure 6 shows an embodiment of a grate roll 28, whose metal sections 29 form grates to the field stack base when forming the base for the layers. The grates allow the rainwater to exit the base such that the lowest sod peat layer need not be on a wet surface. Already in a few hours from the roll- ing, the base surface and the grates harden and form a water-rejecting surface. The field stack method will now be described with reference to Figure 7. In 702, the base for the field stack is formed. Before this step, the production area or strip may be cleared from trees, rootstocks and visible stones. The base may have a width of 2 to 8, preferably about 6 meters, for instance. The dropping files of the sod peat may be about 50 cm wide. A layer of sod peat refers to the coverage of sod peat transferred onto the field stack using the dropping files. A layer may here refer to the sod peat placed onto one or both sides of the sod peat field stack.

Usually the width of the strip is about 20 meters and thus, in this ex- ample, 14 metres of the width of the strip remain effectively for production. The widths of the field stack or the strip are not limited to the examples given above. The field stack to which the layers of sod peat is collected, is thus narrow in comparison with the total width of the strip, that is, the width of the field stack is less than half of the total width of the strip, may even be less than one third of the total width of the strip. The field stack is preferably placed in the middle of the strip but may alternatively be in some other location depending on the strip characteristics.

The length of the strip depends on the bog area. There may be a plurality of strips in the bog area and they may be separated from each other by strip ditches. The length of the field stack is essentially the same as the length of the production field. At the ends of the production field, room may be left for the tractor to drive around the field stack. The field stack may thus be slightly shorter than the production field.

The base of the field stack may first be evened out by using a level- ling screw, which levels the base and may optionally make the base inclined towards the ditches such that the highest point of the base is in the middle of the base. Finally, the base may be rolled with a grate roll such that grates are formed to the both sides of the base, which grates allow rainwater to exit the base. The rolled surface of the base hardens and becomes water-rejecting already in a few hours from handling. In this way an optimal drying base for drying of the sod peat is formed. The base of the field stack may have a form of a gentle ridge roof or the like. When building the base and evening out the base on which the first production layer of the sod peat field stack from the strip is produced, there may be a slope of at least 5 cm / metre on both sides of the base such that exiting of rainwater is ensured and the pieces dry as soon as possible despite of the weather conditions. Alternatively, the first layer of sod peat may be collected on a flat base, in which case the lowest layer of sod peat may not dry as well as the other layers placed on top of the bottom layer.

In 704, the peat is won from the bog. In 706, the peat is pressurized into the output pipes. In 708, the peat tube is cut into sod peat. In 710, a first layer of sod peat is conveyed onto the base so as to form a first layer of a sod peat field stack. The winning of the sod peat in the method may be carried out on the area of the strip excluding the area covered by the field stack.

In 712, the first layer of sod peat in the field stack is allowed to dry naturally under the influence of sunshine and wind without turning and/or wind- rowing.

In 714, which may be after 3 to 6 days, preferably under two weeks, after the winning of the previous layer, a next layer of sod peat is won and conveyed on top of the previous layer. The just extracted layer of sod peat that is on top of the previous layer of sod peat in the field stack is then allowed to dry for some days before adding a new layer of sod peat to the field stack.

The above-mentioned steps may then be repeated a number of times during the harvesting season. The number of layers that are collected from the strip may be 2 to 16, for instance. It has to be noted that when sod peat is collected to the field stack, it forms a water-rejecting surface already in a couple of hours. When the drying proceeds, the size of the piece reduces. When there is a plurality of layers in the stack, the drying and moving of pieces form a structure having spaces between the pieces. The field stack that has layers of sod peat and dries naturally thus becomes automatically very well ventilated. In fact, the higher the numbers of layers, the better become the drying conditions. In the above-described method, only the lowest layer of sod peat touches the ground. In 716, at the end of the harvesting season, the sod peat (layers) that have dried naturally in the field stack, is collected, that is, loaded for transportation to a store or a burning plant. Natural drying refers here to drying under the influence of sunshine and wind only. There is no need for windrowing and turning of the sod peat. Figure 8 highlights the implementation of the method. It shows a sod peat production field 850 having ditches 852, 854 on both sides of the production field. Sod peat is collected to a sod peat field stack 862, which may be substantially at the middle of the production field 850. The sod peat field stack 862 is narrow compared to the total width of the production field 850. The field stack has substantially the same length as or is slightly shorter than the production field. The base of the sod peat field stack 862 may have a base having an apex 856 and at least partly inclined sides 858, 860. The inclination allows the rainwater to run away from the sod peat field stack to the bog and further towards the ditches 852, 854. Figure 8 also illustrates the movement of the tractor carrying out the winning of sod peat. The tractor is shown in 4 different positions 854A to 854D. In position 854, the sod peat cutting machine is close to the sod peat field stack and the belt conveyor can be in its short form. Sod peat can be conveyed to the side closer to the tractor or over the apex 856 onto the other side of the field stack.

In position 854B, the machine is close to an edge of the production field. As the distance to the field stack 862 is long, the belt conveyor needs to have its maximum length.

Position 854C highlights the situation where the machine goes around the field stack from one side to another. In position 854D, the machine works on the other side of the field stack than in positions 854A to 854C and the working direction is shown by the arrow in front of the machine.

Thus, the method and apparatus relate to the production of sod peat from a production area. The production area may be a rectangular strip having a width of about 20 metres, for instance, and limited by ditches on the sides of the strip. The length of the production field may be from tens of metres to kilometres. The sod peat lifted from the strip is conveyed to a sod peat field stack, where the sod peat is allowed to dry naturally, that is, without windrow- ing and turning. The sod peat field stack may be placed in the middle of the strip, for instance. Thus, the working machine may work around the field stack and may convey the extracted sod peat from both sides of the field stack to the field stack. The field stack is narrow compared to the total width of the strip, that is, the width of the layer base is less than a half or less than a third of the strip width.

The field stack may have a base that is formed into the shape of a ridge having an apex and at least partly inclined sides. The angle of the inclination may be about 2 to 10 degrees.

Each of the sides of the field stack may be provided with grates extending transversely to the apex. Thus, rainwater runs away from the base and the sod peat collected over the base has optimal drying conditions. New layers of sod peat may be collected to the field stack at intervals of a few days, for instance, depending on weather conditions.

The machine carrying out the sod peat production has a screw for winning the sod peat from the production area. The machine is also provided with a belt conveyor configured to convey the just won sod peat to the layer base.

The machine may have devices for adjusting the belt conveyor such as to convey the sod peat to the field stack from different distances between the machine and the stack. This may be carried out by adjusting the length of the belt conveyor. The machine may also be configured to adjust the height of the belt conveyor such that sod peat can be dropped onto the field stack from a short dropping distance between the belt conveyor and the top surface of the field stack of sod peat. This way, breaking of the sod peat is avoided when it is dropped onto the stack. The sod peat exit end of the conveyor may be adjust- able in height by means of a winch and an attachment backstay.

In an embodiment, there is provided a sod peat machine comprising a winning pipe housing a winning screw, comprising a thread and a counter- thread of said thread, the machine further comprising an output pipe for allowing the sod peat to exit the winning pipe. On the winning screw axle between the winning thread and the counter-thread, on an unthreaded section of the screw, there may be positioned an emptying claw at the position of the output pipe, which emptying claw is configured to remove and crush waste from the end of the output pipe. Thus, the emptying claw rotates together with the screw and wipes the end of the output pipe clean with each rotation cycle.

In an embodiment, there is provided a sod peat machine comprising a winning pipe housing a winning screw, the machine further comprising an output pipe for allowing the sod peat to exit the winning pipe. The sod peat machine further comprises an emptying and cleaning tube insert able into the output pipe for removing any obstacles therein. The machine may comprise an emptying hatch in the winning pipe for allowing the obstacle to exit the winning pipe, which opening of the emptying hatch may be coordinated with the opera- tion of the output and cleaning pipes such that the operation of the opening and cleaning tubes is configured to trigger opening of the emptying hatch.

In an embodiment, there is provided a sod peat machine comprising a winning pipe housing a winning screw, the machine further comprising an output pipe for allowing the sod peat to exit the winning pipe. The sod peat machine further comprises a rotating cutting device for cutting the peat exiting the output pipe into pieces, which cutting device is configured to rotate on the basis of the kinetic energy of the sod peat. Thus, the falling sod peat rotates the cutting device that has a plurality of blades.

The sod peat machine may comprise grinding blades positioned inside the winning pipe, and a winning screw, to the axle of which has been installed a winning thread and its counter thread.

In the sod peat machine, on the winning screw axle between the winning thread and the counter-thread, there may be hard-steel emptying clamps and mixing wings attached to the axle. The sod peat machine may comprise an additional hatch of winning pipe for additional feeding of peat and an emptying hatch for the removal of waste and for service. In the sod peat machine, the additional hatch, emptying hatch, and opening and cleaning tubes may be remotely controllable such that there is no need to stop the peat winning process.

In the sod peat machine, the sod peat guide conveyor may be pivot able to the side and lockable with a locking pin during transportation.

In the sod peat machine, the lower end of the winning pipe may be provided with an attachment and protection frame, which preferably operates as a control slide or the like.

It is clear that the invention is not limited to the embodiments pre- sented above but it can be modified within the scope of the patent claims.

Claims

1. A sod peat production method comprising: - winning sod peat from a peat production field, characterized by:

- conveying the just won sod peat to a sod peat field stack such that the just won sod peat is conveyed on top of previously won and naturally dried sod peat.

2. A method according to claim ^ characterized in that the sod peat is conveyed to a field stack being substantially of the same length as the peat production field.

3. A method according to claim 1, c h a ra cte ri zed in that the sod peat is conveyed to a sod peat field stack that is narrow in comparison with to the width of the peat production field.

4. A method according to claim 1, c h a racte ri zed by:

- winning sod peat from both sides of the sod peat field stack, which is positioned essentially in the middle of the peat production field; and

- conveying the sod peat won from both sides of the sod peat field stack to the sod peat field stack that is positioned substantially in the middle of the peat production field.

5. A method according to claim ^characterized by: - conveying the just won sod peat as a layer of sod peat to the sod peat field stack including one or more previously won and naturally dried layers of sod peat.

6. A method according to claim ^characterized by: - conveying the just won sod peat to sod peat field stack, which has a ground base formed into the shape of a ridge having an apex and at least partly inclined sides.

7. A method according to claim ^characterized by: - conveying the just won sod peat to the sod peat field stack which has a ground base formed into the shape of a ridge having an apex and at least partly inclined sides, and each of the sides has grates extending transversely to the apex.

8. A method according to claim ^characterized by: conveying the just won sod peat on top of sod peat in the sod peat field stack, which sod peat has dried naturally for less than two weeks.

9. A sod peat winning machine, comprising

- means for winning sod peat from a peat production field, characterized by:

- a belt conveyor configured to convey the just won sod peat to a sod peat field stack such that the just won sod peat is conveyed over a previously won and naturally dried sod peat.

10. A sod peat winning machine according to claim 9, charac- terized in that the machine comprises means for adjusting the length of the belt conveyor such as to be able to convey the just won sod peat to the sod peat field stack from different distances between the machine and the sod peat field stack.

11. A sod peat winning machine according to claim 9, charac- terized in that the machine comprises means for adjusting the height of the belt conveyor such that the sod peat is droppable to the sod peat field stack from a short dropping distance between the belt conveyor and the top surface of the sod peat field stack.

12. A sod peat machine according to claim 9, characterized in that the machine comprises a winning pipe housing a winning screw, comprising a thread and a counter-thread of said thread, the machine further comprising an output pipe for allowing the pressured sod peat to exit the winning pipe.

13. A sod peat machine according to claim 12, characterized in that on the winning screw axle between the winning thread and the counter thread an emptying claw is positioned at the position of the output pipe, which emptying claw is configured to remove waste from the end of the output pipe.

14. A sod peat machine according to claim 12, characterized in that the machine comprises opening and cleaning tubes for the removal of obstacles in the output pipes.

15. A sod peat machine according to claim 9, characterized in that the machine comprises a rotating cutting device for cutting the peat into sod peat pieces, which cutting device is configured to rotate on the basis of the kinetic energy of the sod peat.