FR3055827A1 - PLANT MILL WITH INCREASED SAFETY - Google Patents

Abstract

The invention relates to a plant mill in which the product to be treated circulates from a non-dangerous charging zone (1) to a user-hazardous treatment zone (2), comprising a light curtain (R) of security formed by a ray beam curtain, substantially orthogonal to the path of the product during its circulation, issuers (7) carried by a support (8) overlooking the path of the product, this support being also the support receivers for certain rays reflected by a body passing through the curtain, characterized in that it comprises, between the support (8) of the transceivers (7) and the product path, a screen (10) manually retractable between an unstable position in which it intercepts each of the beams of the curtain (R) and a stable position in which it is outside these beams, this screen being provided to the right of each beam of a reflector of a kind to reflect towards the receivers of the support at least a part of the intercepted beams.

Description

© Publication number: 3,055,827 (to be used only for reproduction orders) (© National registration number: 16 58480 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE © Int Cl ⁸ : B 27 L 11/02 (2017.01), B 02 C 18/22, 23/04

A1 PATENT APPLICATION

©) Date of filing: 12.09.16. (© Priority: (© Applicant (s): BUGNOT 55 Simplified joint stock company - FR. @ Inventor (s): BUGNOT ERIC and BORD JEROME. ©) Date of public availability of the request: 16.03.18 Bulletin 18/11. ©) List of documents cited in the preliminary search report: See the end of this booklet (© References to other related national documents: ©) Holder (s): BUGNOT 55 Simplified joint-stock company. ©) Extension request (s): © Agent (s): CABINET BOETTCHER.

FR 3 055 827 - A1 (04) GRINDERS OF PLANTS WITH INCREASED SAFETY.

(© The invention relates to a plant shredder in which the product to be treated circulates from a non-hazardous charging zone (1) to a dangerous treatment zone (2) for the user, comprising a light curtain (R ) of safety formed by a curtain of beams of rays, substantially orthogonal to the path of the product during its circulation, coming from transmitters (7) carried by a support (8) overhanging the path of the product, this support also being the support of receivers for certain rays reflected by a body passing through the curtain, characterized in that it comprises, between the support (8) of the transceivers (7) and the path of the product, a screen (10) retractable manually between an unstable position in which it intercepts each of the curtain beams (R) and a stable position in which it is outside these beams, this screen being provided at the right of each beam with a reflector of a reflective nature Chir to the receivers of the support at least a portion of the intercepted beams.

i

The present invention relates to a plant shredder comprising increased safety equipment.

BACKGROUND OF THE INVENTION A plant shredder conventionally comprises a product introduction zone comprising a hopper which slightly constrains the product in order to gather it at the entrance to a grinding zone where the cutting tools are located. and shredding. An extraction chute makes it possible to recover the ground material or the chips.

In this type of machine, a distinction must be made between two categories depending on whether or not they have a system for supplying the product to the entrance to the grinding zone. In general, the machines that do not have them are low power machines in which the product is put into the hopper by hand by the operator. The grinding tool has low inertia. The machines which have it are of greater power and the tools: for grinding are rotary (on a drum, carried by a disc perpendicular to the path of the product, ...) and the inertia of the tool is important · .

Figure 1 illustrates a second type of grinder by a schematic side view. It is understood that the zone which presents a danger to the user is that which is on the left of the figure and which contains the rotary tools capable of catching, for example, the hand of the user who has crossed a plane limit h "

There are intangible safety barriers which, if crossed, instantly stop a process for processing a product or a phase of it so that the process cannot continue. These barriers are formed by- light beams, in particular infrared, starting from arranged emitters- and regularly spaced along an adequate pitch in line in an upstream plane, from the aforementioned limit L to form a vertical curtain R. This curtain is well split crossed by the material to be reduced which does not hamper the running of the machine. If, on the other hand, an object having sufficient reflecting power - and more particularly a reflector worn in a manner · adapted by the operator 5 crosses the curtain, the; Ray of light. Interrupted is reflected towards its source and is collected by a receiver close to the transmitter and this reception triggers the immediate cessation of the treatment process either by immobilization of the grinding tools, if their inertia is low, or by the intervention of an emergency brake or more commonly by stopping the supply system in larger machines.

In addition, the; plant shredders operate in an environment containing dust, sometimes humid, complicated conditions which require significant maintenance to guarantee safe operation. It is therefore a top priority that the safety devices are always operational.

In the case of personnel safety serving this type of machine, it must be certain that the various components are in working order each time the machine is used.

The provisions of the invention are provided to meet this requirement.

OBJECT OF THE INVENTION

This is how the present invention relates to a plant shredder in which the product to be treated circulates from a non-hazardous area of enfouphemerit to a treatment area which is dangerous for the user, comprising a non-material safety barrier formed by a curtain of; bundles of rays substantially orthogonal to the path of the product during its circulation, coming from transmitters carried by a support overhanging the path of the product, this support also being the support of receivers for · certain rays reflected by · a body; reflecting through the curtain, characterized in that it comprises, between the support of the transmitters and receivers and the path of the product, a screen retractable manually between an unstable position in which it intercepts: each of the beams of the curtain and a stable position in which it is: outside these beams, this screen: being provided at the right of each beam with a reflector of a nature to reflect towards the receivers of the support at least a portion of the intercepted beams.

In addition to this retractable screen, the crusher includes means for authorizing the complete placing in the machine of the machine in case all the receivers have been reached by a reflected ray. These means are, for example electronic and in any case achievable by those skilled in the art. If at least one of the receivers is not activated by a reflected ray, authorization is not given. In other words:, when the machine is: stopped the 'is-to-air either the processing tools themselves or the feeding system, the tools being able to be in motion;), the command to start it is functionally prohibited if the shutter has not been operated. If this command allows you to check that all transceivers are working properly, the ban is functionally lifted (for example closing a

S interrupter which opened at the time of the previous stop) and the command to start the machine by the user is effective.

Preferably, the beam interception screen is presented in the form of a flap articulated pendulumly about an axis parallel to the plane of the curtain to which is fixed a handle of its maneuvered around this axis and subjected to the effect of a return spring, tending to return it to its stable position. This can be: for example a position substantially parallel to the curtain of beams defined by a: stop; against which the shutter is pressed by the spring.

In a variant not shown, the interception screen is formed by a slide associated with a return member. The slide is perpendicular · to the radiation curtain and has a plurality of holes through which the radiation can pass when the slide is held in its stable position by the return member and alternately with the holes, a plurality of reflectors which intercepts the radiation and returns it to the reflectors: when the slide is held by the operator in its unstable position.

Other characteristics and advantages of: the invention will emerge from the description given below of an exemplary embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Reference will be made to the appended drawings in which:

- Figure 1 illustrates · by a schematic side view, as already mentioned :, a known vegetable shredder-,

- The · Figure 2 illustrates · by a cross section of the safety curtain ·, the means of the invention in; the stable position of the beam interception shutter, in a preferred mode of making this shutter,

- Figure 3 illustrates these same means in the unstable position of the flap.

DETAILED DESCRIPTION OF THE INVENTION

The crusher shown in Figure 1 includes a hopper 1 for charging the product (direction of the arrow El), the walls of which converge towards the zone 2 of treatment. The lower wall of this hopper comprises · a device for feeding the product: such as: for example a conveyor belt 3 possibly fitted with drive teeth. This feeding device is completed: by a swallowing roller 4 which forces, in: direction F1, the product against a drum 5 for cutting or shredding in the area: 2, The crushed or cut or shredded product is removed by means di a goülotte 6, generally pneumatically (arrow F2). The supply system: can of course suffer from several variant embodiments known in themselves. The curtain

SR is, according to the invention, generated by transmitters 7 as shown in Figures 2 and 3. -These transmitters are regularly spaced transversely to the path of the product in the machine and are accompanied by receivers (incorporated in transmitters 7) of a radiation reflected by a body whose reflective power is sufficient to return at least part of the radiation which strikes it in the direction of these; receivers. Ge reflective body will be for example, a suitable coating which the operator will be provided at the ends of its members.

These transceivers are fixed to the casing G of the machine by a support 8 and the light beam 7 has generated and reflected by each of them passes through this casing through orifices; 9 provided for this purpose. The support 8 also constitutes the support for a screen 10 which is articulated around a transverse axis 11 in a pendular manner. In its state represented in FIG. 2, the screen is in a stable position · under the effect of gravity, preferably assisted by one or two return springs (12 a) which press it against a wall 8a of the support. .

In its state shown in FIG. 3, the 1: 0 screen is tilted in the direction of the light beams 7a, 7b, 7c, 7d so that these are intercepted and reflected by this screen in the direction of the receivers. To this end, the screen carries a reflective coating adapted to return radiation, at least part of which is capable of being perceived by the receivers. This coating can; also be placed on reliefs of the screen which, in its state of FIG. 3, are turned more directly towards the transmitters 7.

To pass from the state of FIG. 2 to that of the

3: 5 figure; 3, it suffices to manually actuate the tilting lever 12 against the return force. The screen returns to its state in FIG. 2 when the lever is released.

In FIG. 3 there is also schematically shown a machine safety circuit to illustrate the procedure for starting the machine. One control unit 13 has a start button 14. The machine being stopped, but the Inf rarouge 7 transceivers being in service ·, the direct actuation of this button 14 produces no effect, the starting being inhibited. In this regard, start-up means either that of the drum or knife-carrying disc in the case of: a machine with low power: that of the feeding system, while the grinding tools can be in movement (if they are: for example driven: by the PTO of an agricultural tractor). The user then switches the screen 10 to intercept the radiation from all the transmitters: and send radiation to each of them: reflected. Each receiver having received this reflected radiation, emits: then a signal towards the unit: from

0 command 13. It is only: if this key receives a signal from each sensor, that it unblocks the start of: the machine and an action on the button 14 leads to the start of the latter. Otherwise, the machine does not start and the user is forced to check the state of the transceivers: and to clean or repair them if necessary, in order to be able to restart this process successfully once the machine start-up procedure .

The advantage of the invention is: on the one hand, to increase the safety of the user by forcing each time the machine is started a procedure for validating the proper functioning of the safety barrier: and on the other hand, to have rendered: this validation procedure very simple and very quick; so that in the event of an incident, the machine can be started very quickly.

Claims (3)

1. Crusher of plants in which the product to be treated Gireule from a charging area (1) no 5 dangerous up to a treatment zone (2) dangerous for the user, comprising a safety light curtain () R) formed by a curtain of beams of rays, substantially orthogonal to the path (Fl) of the product lora of its circulation , From transmitters (7) carried by a 10 support (S f overhanging the path of the product, this support also being the support of receivers for certain rays reflected by a body passing through the curtain, characterized in that it comprises, between the support (8) of the transceivers (7 ) and the path (Fl) of the product, a 15 screen (10) retractable manually between an unstable position in which it intercepts each of the beams; (7a) of the curtain (R) and a stable position in which it is. outside these beams (7a), this screen being provided, at least on the right of each beam, with a 20 reflector capable of reflecting towards the receptors of the support at least a portion of the intercepted beams. 2. Crusher according to claim 1, characterized in that it comprises, in addition to this retractable screen (10), 25 means (13d to authorize the start-up · of the machine in case all the receivers have been reached by a reflected ray. 3. Crusher according to claim 1 or claim 2, characterized in that the screen 30 beam interception is in the form of a flap (10) hinged pendulumly about an axis (11) parallel to the plane of the curtain · (R) to which is fixed a lever (12) of its operation around this axis and subjected to the effect of a return spring (12 a) tending to return it 35 in its stable position. 1/2