DE102007009658B3 - Holzhäckselmaschine - Google Patents

Abstract

The The invention relates to a wood chipper machine, in particular drum wood chipper, with (a) a rotatably mounted chopping device (12) and (b) one the chaffing device (12) partially surrounding screen basket (10) for receiving a sieve. According to the invention, it is provided that guided the strainer (10) is stored.

Description

The The invention relates to a wood chipper machine, in particular a drum wood chipper machine with a rotatably mounted chopping device and a chopping device partially surrounding strainer basket for holding a sieve.

such Holzhäckselmaschinen are known and serve the shredding from wood in the form of twigs, branches or whole tree trunks to small ones Shredding. Holzhäckselmaschinen include one about a longitudinal axis rotatably mounted chopping device, the cleaver has. When the choppers are essentially parallel to the acting as a rotation axis longitudinal axis of the chopping device are spoken by drum-wood shredders, when the chopping knives are arranged substantially perpendicular to the axis of rotation are spoken of a disc wood chipper.

Especially Trommelholzhäckselmaschinen have a chopping device partially surrounding screen basket, which accommodates a screen. The sieve serves to chaff near the chopping device to keep exceeding the predetermined maximum size. The near the chaffing device held, too large chaff be from the chopping device recaptured and chopped. This process is repeated until the resulting chaff of the Fall short of maximum size and fall through the sieve.

By the constant Contact with fast-moving wood chippings wears the sieve and needs to be replaced regularly become. Such replacement is in known wood chippers but expensive, tedious and error prone.

From the DE 199 20 884 C1 a generic Holzhäckselmaschine is known in which the screen basket is pivotally mounted. The disadvantage of this is that the sieve remains by the pivoting away of the screen basket close to the chopper. Replacing the sieve is cumbersome and dangerous for operating personnel. From the DE 704 853 is a Siebhammermühle known in which also the screen basket is pivotally mounted.

From the DE 195 20 982 B9 a drum chipper is known in which the sieve has two mutually displaceably mounted part sieves. The sieve is hinged as a whole, which leads to the above-described problems with an exchange.

Of the Invention has for its object to provide a Holzhäckselmaschine at the screen is particularly easy to replace.

The Invention solves the problem by a generic Holzhäckselmaschine, in which the screen basket on a guide rail guided is stored.

Advantageous on such a wood chipper machine is that the strainer easily from a working position into a Exchange position can be brought, so that the exchange easy and fast. The leadership of the screen basket is also able forces acting on the screen basket so that the screen basket only against a change in position along the guide must be secured. This will only a minimum of parts lost like screws, nuts, bolts or tension hooks needed.

In a preferred embodiment the sieve basket is designed to operate during the wood chopper a working position and to exchange the sieve an exchange position to take and is guided from the working position to the replacement position and can be brought back. In particular, the screen basket is both in the working position as well in the exchange position with the wood chipper, in particular a chassis or a side wall of the wood chipper connected. Thereby Ensures that the strainer basket does not fall down and serving Can hurt people. Because the strainer basket is guided with the wood chipper machine is connected, also bringing a strainer basket from the working position in the exchange position or vice versa.

In a preferred embodiment the screen basket is mounted by means of a linear guide, however not the only guide must represent. An advantage of this is the particularly simple production a linear guide and their robustness and stability.

In a preferred embodiment the strainer basket has a partially cylindrical casing shape and is in two bearing points mounted on a parallel to a rotation axis the chopping device extending straight lines lie. For example, these two bearing points in the above mentioned linear guide be stored.

It is particularly preferred that the screen basket is mounted at least also via at least one hinge. In particular, a hinge is to be understood as meaning a joint, which does not permit complete rotation about a full circle, but rather a pivotal movement. It is particularly preferred that the screen basket is mounted both by means of a linear guide and by means of at least one rotary joint. As a result, the screen basket is able to perform a combined pivot-push movement, which is particularly well suited is so as not to become wedged when changing from the working position to the replacing position. In addition, this makes it particularly easy to change from the exchange position to the working position.

Especially preferred is an embodiment at the screen basket on a flap of the wood chipper is fastened and the closure flap by means of at least one Swivel joint is stored. In this case, the screen basket is preferably by means of the at least one rotary joint of the closure flap is mounted, so that by moving the shutter and the strainer basket movable is. Cheap it is because of the position of the flap the position of the strainer basket is derivable, so that a check whether the strainer basket is in its correct position is simply possible.

In a preferred embodiment the flap is part of the housing of the wood chipper machine and can take an open position and a closed position, wherein the strainer basket so guided is that the screen basket then occupies its Ar beitsposition, if the shutter is in its closed position. Because of this constructive feature is achieved by having a control of the position the shutter is sufficient to make sure that the Strainer basket is in its working position. If the wood chipper an opening sensor for the Cover flap that communicates with a controller is the controller is preferably designed so that they have a Commissioning of the wood chipper machine or starting the chopping device only possible when the shutter is in its closed position. Owns the Holzhäckselmaschine also an automatically operable Shutter-lock, it is preferably provided that the controller is designed such that the closure flap lock only then transferred to an unlocked state when the chaffing device falls below a predetermined safety speed. In this way Ensures that an operator of the wood chipper machine does not accidentally can come in contact with a rotating chopper.

In a preferred embodiment has the wood chipper machine a drive on to the shutter from the working position to the exchange position. This drive is preferred motor driven, so that the shutter is only bypassing the Drive openable by hand and closable is. Its cheap, when the motor is driven by the controller so that he only then the flap opens, if the chopping device has fallen below the predetermined safety speed. This construction has the advantage that a replacement of the screen is possible without loosening a strainer for the strainer basket. It all you have to do is replace the sieve by hand, all others Steps are automatable. An exchange of the sieve is therefore fast and safe possible.

Especially Preferably, the drive is a hydraulic drive. Holzhäckselmaschinen often have a hydraulic system for operating other components on. In this case, the drive with particularly simple means and therefore cost-effective and to realize with little effort. Hydraulic drives also wear out little and ensure a safe closing the flap.

in the Following is an embodiment of the Invention explained in more detail with reference to the drawings. It shows

1 a perspective view of a screen basket of a Holzhäckselmaschine invention,

2 after the strainer basket 1 in a perspective view obliquely from below and

3 the screen basket according to the 1 and 2 in a perspective view with a side wall removed.

1 shows a screen basket 10 , which has a part-cylinder jacket-shaped shape and in 1 is shown in a position between a working position and an exchange position. In the working position is the screen basket 10 in close proximity to a chopper 12 , in the 1 indicated by dashed lines. The chopping device 12 has not shown on its circumference chopping knives for chopping wood, which is substantially parallel to a rotation axis 14 the chopping device 12 are arranged. The chopping device 12 is about the axis of rotation 14 in two camps 16a . 16b rotatably mounted, each in a first side wall 18a and second side wall 18b are attached.

The chopping device 12 is part of a wood chipper, which is fed wood during operation. This wood is from the chaffing device 12 crushed into small chopped shredded in 1 down through the not shown sieve and the screen basket 10 fall if they fall below a predetermined by the sieve maximum size.

2 shows the screen basket 10 in a view from diagonally below. It is a guide rail 22b recognizable, on the second side wall 18b screwed or welded. In the same way on the first side wall 18a one of this first sidewall 18a concealed guide rail 22a attached in 2 indicated by dashed lines. The guide rails 22a . 22b form a linear guide.

The sieve basket 10 includes a role 24b who are at a head start 26b is rotatably mounted. The role 24b rolls on the guide rail 22b from and is then when the strainer basket 10 as in 2 shown in its replacement position, at a lower end 28b the guide rail 22b , In the same way runs a dashed line role 24a who are at a head start 26a is attached, on the guide rail 22a , All components whose reference numerals have the same number and differ by the suffix a and b, respectively, are relative to a plane perpendicular to the axis of rotation 14 stands, constructed mirror-symmetrically.

The first side wall 18a and the second side wall 18b each have a tab 30a . 30b on, at those over swivels 31a . 31b a flap 32 is pivotally mounted. This includes the flap 32 a support structure 34 , the circular projections 35a . 35b possesses, with which it into circular openings in the tabs 30a . 30b engages and so the swivel joints 31a . 31b forms.

At the on their chopper 12 facing side is to the support structure 34 a rectangular metal plate 36 welded. About halfway between the tabs 30a . 30b and one of the tabs 30a . 30b opposite upper end 38 are on the metal plate 36 two spacers at the edge 40a . 40b welded, with the spacer 40b in 2 from the metal plate 36 is covered. At the spacers 40a . 40b is the screen basket 10 in pivot bearings 41a . 41b pivoted.

At about the same height as the spacers 40a . 40b is at the support structure 34 a piston head 42 a piston 44 pivotally attached, the part of a hydraulic cylinder 46 is. At one of the piston head 42 opposite end is the hydraulic cylinder 46 on the first side wall 18a pivoted. Via a first hydraulic connection 48 and a second hydraulic connection 50 can the hydraulic cylinder 46 be acted upon by an otherwise not shown hydraulic system with pressurized hydraulic fluid. When the hydraulic connection 50 is pressurized, the piston moves 44 in the in 2 shown position in which the flap is in an open position and in the screen basket 10 is in his exchange position.

When the first hydraulic connection 48 is pressurized, so the piston moves 44 in a retracted position, the flap 32 pans in the 3 shown counterclockwise about a pivot angle σ, the spacers 40a . 40b move on the axis of rotation 14 to and the roles 24a . 24b run on the respective guide rails 22a . 22b on an upper end 52a respectively. 52b the respective guide rail 22a . 22b to.

In its end position is the piston 44 completely retracted, the metal plate 36 lies flush with the side walls 18 . 20 and is in its closed position. In this position forms the shutter 32 a part of a housing of the wood chipper, so that the access to the chopping device is prevented by a user.

The sieve basket 10 has a circle of curvature due to its teilzylindmmantel-shaped, which in turn has a center. In the closed position of the flap 32 this center coincides with the axis of rotation 14 match so that is between the screen basket 10 and the chopping device 12 a circumferential gap of constant width results. In this gap, the non-drawn screen is arranged.

To change the sieve, a not shown control of the chopper first detects a rotational speed ω of the chopping device 12 , If this rotational speed ω falls below a predetermined safety rotational speed ω _Sure , then the second hydraulic connection becomes 50 pressurized, whereupon the flap 32 moved into their open position. At the same time the sieve basket moves 10 as described above in its replacement position. In this position, a restart of the chopping device 12 suppressed by the controller. An operator can now remove the sieve and replace it with a new sieve. Subsequently, the first hydraulic connection 48 pressurized and the shutter 32 moves into its closed position. At the same time, the screen basket moves to its working position. When the flap is closed, the controller releases the wood chipper for further operation.

10

strainer

12

chopping

14

axis of rotation

16a, b

camp

18a

first Side wall

18b

second Side wall

22a, b

guide rail

24a, b

role

26a, b

head Start

28a, b

lower The End

30a, b

flap

31a, 31b

swivel

32

flap

34

support structure

35a, b

circular projection

36

metal plate

38

upper The End

40a, b

spacers

41a, 41b

pivot bearing

42

piston head

44

piston

46

hydraulic cylinders

48

first hydraulic connection

50

second hydraulic connection

52a, b

upper The End

σ

swivel angle

Claims (12)

Wood chopping machine, in particular a drum chopper, having (a) a rotatably mounted chopping device ( 12 ) and (b) the chopping device ( 12 ) partially surrounding strainer basket ( 10 ) for receiving a sieve, characterized in that the sieve basket ( 10 ) on a guide rail ( 22 ) is guided guided. Wood chopping machine according to claim 1, characterized in that the screen basket ( 10 ) is formed to occupy a working position and the exchange of the sieve a replacement position during operation of the Holzhäckselmaschine and guided from the working position in the exchange position and can be brought back. Wood chopper according to one of the preceding claims, characterized in that the sieve basket ( 10 ) by means of a linear guide ( 22 ) is stored. Wood chopper according to claim 3, characterized in that the screen basket ( 10 ) on two guide rails ( 22 ) is guided guided, which is a linear guide ( 22 ) form. Wood chopper according to one of the preceding claims, characterized in that the sieve basket ( 10 ) has a teilzylindermantelelförmige shape and in two bearing points ( 24 . 31 ) mounted on a parallel to a rotation axis ( 14 ) of the chopping device extending straight lines. Wood chopper according to one of the preceding claims, characterized in that the sieve basket ( 10 ) via swivel joints ( 31a . 31b . 41a . 41b ) is stored. Wood chopper according to one of the preceding claims, characterized in that the sieve basket ( 10 ) by means of a linear guide ( 22 ) as well as by means of swivel joints ( 31a . 31b . 41a . 41b ) is stored. Wood chopper according to one of the preceding claims, characterized in that the sieve basket ( 10 ) on a closure flap ( 32 ) of the wood chipper machine is attached and the closure flap ( 32 ) by means of swivel joints ( 31a . 31b ) is stored. Wood chopping machine according to one of claims 2 to 8, characterized in that - the closure flap ( 32 ) is a part of a housing of the Holzhäckselmaschine and can take an open position and a closed position and that - the strainer ( 10 ) is guided so that the screen basket ( 10 ) then assumes its working position when the closure flap ( 32 ) is in its closed position. Wood chopper according to one of the preceding claims, characterized by a drive ( 46 ) for bringing the flap ( 32 ) from the working position to the replacement position. Holzhäckselmaschine according to claim 10, characterized in that the drive is a hydraulic drive ( 46 ). Wood chopper according to one of the preceding claims, characterized by a control, which is connected to a rotational speed sensor for detecting a rotational speed (ω) of the chopping device and designed to drive only for bringing the closure flap ( 32 ) to operate in its exchange position when the rotational speed (ω) falls below a predetermined safety rotational speed (ω _sure ).