JPS6216694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a safety lock for an impeller breaker whose casing is divided into an upper part and a lower part in a plane extending through the axis of a toothed rotor. A locking device of the type in which the upper part is connected to the lower part so as to be pivotable about an axis parallel to the axis of the toothed rotor, and in which the toothed rotor is supported in the upper part. Regarding.

BACKGROUND OF THE INVENTION Impeller breakers are used to crush pulverizable materials which are fed in bulk into granules obtained as deposits with a relatively narrow particle size distribution. The grinding takes place between the cutting edge of a stationary cutter and the cutting edge of a rotating cutter. In order to avoid the risk of accidents, such impeller breakers are equipped with a safety locking device to prevent injuries caused by inserting one's hand into the cutter when the impeller breaker is open and moving. Each stopping device must meet the following conditions:

It is to be avoided that the impeller breaker opens and the hand is thrust into a working component, such as a cutter or the drive member, resulting in injury and that the drive is connected when the impeller breaker opens. The impeller breaker must be opened only after the active components have stopped.

A variety of devices are known, such as shut-off switch locks, double lock locks, electrical and mechanical time delay devices, and the like. These devices are used individually in conjunction with the type of drive and the speed of the cutter rotor; however, in order to meet all safety requirements, it is often necessary to combine the individual devices mentioned above. . However, this is technically complicated and expensive. Moreover, with such composites the risk of failure is relatively high and the possibility of any bridging is also relatively high.

Object of the invention The object of the invention is to provide a safety locking device for an impeller breaker of the type mentioned at the outset, which is simple in construction and operation and which meets all safety requirements.

Structure of the Invention According to the present invention, the cutter rotor is directly driven by a drive motor fixed on a common substrate together with the lower part of the casing via a connecting member. , and when the toothed rotor stops, the drive motor is moved in the axial direction together with the coupling member half that engages with the shaft of the drive motor until both coupling member halves are completely uncoupled. It was solved by becoming a.

Embodiments The invention will now be described with reference to illustrated embodiments. The casing of the impeller breaker consists of a lower part 1, an upper part 2 and side guard plates 3 which are fixed to this upper part at the end faces. A grinding chamber is thus formed, in which a cutter rotor 4 is rotatably mounted and cooperates with a cutter 5 fixed on the upper part 2. Towards the bottom, the grinding chamber is bounded by a sieve 6. The rotor 4 with a cutter formed in the shape of a milling cutter has a spiral cutting edge 7 in this embodiment.
are arranged in accordance with herringbone toothing. As a result, the material to be crushed rotating in the grinding chamber is sent toward the center of the rotor with cutters, so that the end face side of the rotor with cutters is not subjected to any load from the material to be crushed, and especially thermoplastic When using the crushed material, adhesion of the crushed material to the side protection plate 3 of the casing can be avoided.
In this case, the carry-out strip 11 provided on the end face side of the rotor 4 with cutters directs the material to be crushed between the rotor 4 with cutters 4 and the side protection plate 3 toward the circumferential surface of the rotor 4 with cutters. transport. The shaft 8 of the toothed rotor 4 is directly connected by means of a coupling element 9 to a drive motor 10 which is designed as a geared motor. The material to be crushed is placed in the input tube 1.
2 to the impeller breaker, and
After comminution and after passing through the openings of the sieve 6, it is pneumatically removed by the suction trough 13. The lower part 1 of the impeller breaker is fixed to a movable base plate 14. This board also supports the device for axially moving the drive motor 10 (see FIG. 3). The device has a support plate 15 on which a drive motor 10 is screwed and which is held movably by a pin 17 engaging in a slot 16. ing. The movement of the support plate 15 and thus of the drive motor is effected by means of a decoupling device 22, which in this embodiment is designed as a simple pivoting lever 19 that can be pivoted about a pin 18, which decouples the drive pin 20 and the grip. 21. In the ready state of the impeller breaker (see FIG. 1), the contact lever of the limit switch located in the motor current circuit engages positively in a recess provided in the edge of the support plate 15. Such an arrangement is used to interrupt the motor current circuit at the beginning of the travel process and thus to immediately stop the drive motor, such an immediate stopping being possible in this embodiment without additional measures being taken. is made possible. This is because the drive motor 10 is constructed as a geared motor with a relatively low output rotational speed. (The peripheral speed of cutting edge 7 is 0.5
m/s to 2 m/s. ) The axial travel distance is defined by the dimensions of the elongated hole 16. In other words, the elongated holes are so large that the two connecting member halves 9a, 9b are completely separated from each other in the uncoupled state (see FIG. 4). As a result, the safety locking effect produced by the coupling element 9 is removed and the upper part 2 is swiveled upwards together with the toothed rotor 4 (see FIG. 5). In order to prevent contact with the rotating coupling member, two hoods 24, 25 are provided, of which hood 24 is connected to the drive motor 10 and hood 25 to the upper part 2. In the connected state of the connecting member, the edges of the hood are overlapped by approximately the distance traveled in the axial direction of the drive motor 10 (see FIG. 1).

The impeller breaker described is constructed as a subordinate machine for an injection molding machine processing plastics, in which case the unnecessary parts and scraps produced during injection molding can be crushed directly in the injection molding machine, so that the resulting granules can be crushed. can be immediately fed back into the processing process.

Effects and Effects The configuration of the present invention prevents the impeller breaker from being opened during operation. This is because the upper part of the casing, which can be pivoted open, is locked by means of a connecting member. Furthermore, in order to open the impeller breaker, the toothed rotor is forcibly completely separated from the drive. In other words,
Injuries caused by inserting one's hand into the rotating claw rotor are prevented and the upper part of the casing is swiveled open to prevent clipping due to electrical faults or intentional switch bridging. The rotor cannot be started.

Furthermore, when the upper part of the housing is swiveled open, the cutter rotor can be precisely positioned by hand for the cutter adjustment by pivoting on the now exposed coupling half. In this case, there is no need to stick your hand inside the cutlet for this purpose.

Furthermore, the arrangement according to the embodiment of claim 2 is used to prevent the coupling elements from becoming uncoupled under load. As uncoupling device, any device suitable for this purpose can be used, for example a simple pivot lever or a spindle drive which can be driven by a crank handle. In this case, the limit switch is arranged in such a way that it causes an immediate stoppage of the drive at the beginning of the movement process and allows reconnection only when the coupling member is fully coupled. In the case of freewheeling machines, it may be advantageous to provide an automatically acting braking device, which acts as soon as the motor current circuit is interrupted and prevents the machine component from rotating. to stop it very quickly. However, such measures are unnecessary if, in accordance with the embodiment of patent claim 3, a directly coupled geared motor is used for the drive, especially with a relatively low output speed. It is. This is because such motors automatically stop without virtually freewheeling if the motor current circuit is interrupted.

Furthermore, the embodiment according to claim 4 achieves that it is not possible to insert a hand between the halves of the connecting member even in the disconnected state of the connecting member.

[Brief explanation of the drawing]

The drawing shows an exemplary embodiment of an impeller breaker configured as a mobile submachine for an injection molding machine for processing plastics; FIG. FIG. 2 is a cross-sectional view of the impeller breaker as seen in the direction of the arrow in FIG. Figure 5 shows the impeller breaker prepared for swinging the upper part of the casing open; FIG.
FIG. DESCRIPTION OF SYMBOLS 1... Lower part, 2... Upper part, 3... Side protection plate, 4... Rotor with cutter, 5... Cutter, 6... Sheave, 7... Cutting edge, 8... Shaft, 9... Connection member, 9a,
9b...Half part of connecting member, 10...Drive motor, 11...
Unloading strip, 12... Insertion cylinder, 13... Suction trough,
14... Substrate, 15... Support plate, 16... Long hole, 17,
18... Pin, 19... Swivel lever, 20... Entraining pin, 21... Grip portion, 22... Connection release device, 23...
Limit switch, 24, 25...hood.

Claims (1)

[Scope of Claims] 1. A safety locking device for an impeller breaker whose casing is divided into an upper part and a lower part in a plane extending through the axis of a cutted rotor, the upper part being divided into an upper part and a lower part. In a type in which the cutted rotor 4 is connected to the lower part so as to be pivotable about an axis parallel to the axis of the cutted rotor, and the cutted rotor is supported in the upper part, the cutted rotor 4 is connected. Via member 9,
It is designed to be directly driven by a drive motor 10 fixed on a common base plate 14 together with the lower part 1 of the casing, and when the cutted rotor stops, the drive motor 10 is moved to the shaft of the drive motor. Safety for an impeller breaker, characterized in that it is adapted to be moved in the axial direction, together with the engaging coupling half 9a, until the coupling of the two coupling half halves 9a, 9b is completely released. Locking device. 2. Safety locking device according to claim 1, characterized in that, in order to displace the drive motor 10, a decoupling device 22 is used which forcibly cooperates with a limit switch 23 located in the motor current circuit. 3. The safety locking device according to claim 1 or 2, wherein the drive motor 10 is a geared motor that immediately stops when the motor current circuit is interrupted. 4. Contact with the connecting member 9 is prevented by two hoods 24, 25 whose edges are overlapped by approximately the travel distance of the drive motor 10 in the connected state of the connecting member, one of the hoods being 4. Safety locking device according to claim 1, wherein 24 is fixed to the drive motor and the other hood 25 is fixed to the upper part of the pivotable casing.