SU376237A1 - DEVICE FOR VOLUME DOSING TO ROTARY TABLET MACHINES WITH HYDROMECHANICAL DRIVE - Google Patents

Description

Devices for volumetric dosing to rotary tableting machines with hydromechanical drive are known, including a lower punch connected to a slide, interacting with a copier having a movable portion in the zone of volumetric dosing. These devices have the disadvantage that they provide the same dosage of press material at all positions of the tablet press.

The aim of the invention is to provide a device for volumetric dosing, which provides for obtaining differently sized volumes of dosing press material in any of the matrices of the tabletting machine. This is achieved by the fact that the device is equipped with a lever probe fixed on the machine bed, alternately interacting with adjustable stops of the lower punch sliders and connected by means of variable length to the movable section of the copier, in order to maintain a constant angle of contact of the adjustable stops with the lever probe, mounted on parallelogram suspension.

The proposed device for volumetric dosing together with the units of the rotary tableting machine functionalized with it are shown in the drawings, where FIG. one

shows a tablet machine, general view; in fig. 2 is a view along arrow L in FIG. one; in fig. 3 is a section along BB in FIG. 1. On the shaft / rotary tableting machine (see Fig. 1) placed the upper drum 2 with the drive of the upper punches 3, the table 4 with the dies 5 and the lower punches 6, the lower drum 7 with sliders 8, the block of hydraulic cylinders 9, a flat spool 10 for oil supply to hydraulic cylinders //. A copier 12 is fixed around the bottom drum 7 on the frame of the machine, having a movable section 13 connected by a link 14 with a probe 15 of a device for volumetric dosing. The probe is mounted on a parallelogram suspension 16 and its lower position is determined by the limiter 17 (see Fig. 2). The spring 18 tends to always press the probe 15 to the adjustable stops 19, which are located one at each position of the lower drum 7.

The position of the lugs 19 is adjusted by limb 20 and arrow pointer 21. The hopper 22 with press powder is fixed, for example, stationary on the bed and its lower window is adjacent to the surface of the table 4. The device for volumetric dosing of the proposed design is placed on a rotary tableting machine with hydromechanical driven, works as follows.

The rotor machine shaft 1, together with the upper drum 2 fixed on it, the table 4, the lower drum 7 and the block of hydraulic cylinders 9 from the external drive (not shown in the drawings), continuously rotates at a constant angular velocity. At the same time, the slideways 8 roll around with their rollers but the copier 12, shuffled, and vertically in accordance with the given law of motion.

The sequence of work can be simplified as follows. At the moment when the die 5 of the table 4 approaches the window of the hopper 22, the upper punch 3 is retracted to the extreme upper position (the type of drive for the upper punches is not specified in the description). The lower punch 6 is retracted by the slider 8 to the lowest position, the piston of the hydraulic cylinder 11 is also in the lower initial position.

When the point of the matrix 5 is under the window of the hopper 22, the press powder is poured into the free volume of the matrix under the action of its own weight and the agitator (not shown). The volume of the required dose in the matrix 5 is determined by the position of the upper end of the lower punch 6 relative to the surface of the table 4. The position of the punch 6, in turn, is determined by the position of the roller of the slider 8. The position of the roller of the slider 5 at the moment of entry of the matrix point 5 under the hopper window 22 (or which is the same, the given dose of pressurized powder in the matrix depends on the height but at this time the moving section of the copier 13. The change in the position of the latter is achieved next.

When the shaft / machine rotates at the moment corresponding to the entry of the matrix point 5 under the window of the bunker 22, the stop 19 fits under the shchn 15, hinged on the frame. Depending on the predetermined height, the stop 19 lifts the probe 15, raising, in turn, the movable section of Conair 13, which moves, for example, in flat guides. Since in the movable section of the copier 13 at this moment there is a roller of the slide 8, the position of the stop 19 will determine the position of the lower punch 6 and, thus, the required dose of press-dough in the matrix 5. With further rotation, the stop 19 leaves the probe 15, the spring 18 lowers the suspension 16 to the limiter 17, while the movable section of the copier 13 is lowered so that the roller of the slider 8 re-enters the groove of the stationary copier 12. Then, in accordance with the cyclogram, the upper punch 3 lowers until the point 5 of the matrix 5 is fixed and fixed in this position and the spool device 10 supplies high-pressure oil under the piston of the hydraulic cylinder 11 and, by moving the gun up, the tablet is pressed. After pressing, the upper punch 3 is retracted upwards,

the tablet is pushed out of the matrix, and then the cycle is repeated.

The dose value is adjusted by changing the height of the stop 19 at each position of the drum 7 by means of a limb 20 and an arrow 21.

As the shaft rotates / the distance from the hinge point on the frame of the probe 15 to its point of contact with the stop 19 changes all the time (the jaw 15 is set relative to the circle, which is the path of the stops 19), to maintain a constant contact angle of the stop 19 with a horizontal portion of the probe 15, the latter is fixed on a parallelogram suspension, which ensures a constant position along the height of the movable portion of the copier / 5 throughout the entire moment of contact of the horizontal portion of the probe 15 with the stop 19. The probe / 5 has a length of than the length of the movable section of the copier 13, so that the probe 15 is first installed on the stop 19, and then the movable section of the copier 13 is raised together with the roller of the slide 8 and, therefore, the punch 6 to a predetermined height. However, the total length of the probe 15 with the run-in area, the horizontal section and the runout bevel must be less than the pitch of the positions of the drum 7 so that the probe 15 stops 19 of the two adjacent positions do not simultaneously touch the probe. To reduce the swinging of the suspension 16, the probe 15 at high rotational speeds of the shaft / suspension 16 is provided with a damper. A ha 14, which connects the probe 15 to the basement section of the copier 13, consists of two threaded studs connected by a threaded coupling. By rotating the coupling, you can change the length of the cable M, which leads to a change in the position of the movable section of the copier 13 while all the stops 19 on the drum 7 remain unchanged and change the position of all the punches 6. The need for such adjustment is caused, for example, by changing the volume weight of the pressor of different batches at a constant given weight pills.

Subject invention

Claims (2)

1. A device for volumetric dosing to rotary tableting machines with a hydromechanical drive, comprising a lower punch connected to a slide that interacts with a copier having a movable portion in the zone of volumetric dosing, in order to obtain different amounts of dosing press material in any of the dies, it is provided with a lever probe fixed to the machine bed, alternately interacting with adjustable stops of the lower punch sliders and connected by means of and the variable length movable portion of the copier. 2. A device according to claim I, characterized in that 5, in order to maintain a constant contact angle of the adjustable rails with the lever probe, the latter is mounted on a parallelogram suspension. Fy sixteen P IS ,