HU183552B - Piece feeder - Google Patents

Abstract

The invention relates to an apparatus for charging components which are intended to be discharged predominantly individually. The operating method of the charging apparatus is essentially based on the principle of communication vessels and exploits the phenomenon where, in the interior of a tube, the components arranged one above the other move in the branches of the tube in the same way as a liquid, assuming that the outline of the components corresponds to the internal cross-section of the tube and the inner volume is filled and vibration is provided. The essence of the invention is the use of a vibrated U-shaped communication tube, whose branches are of different heights. The components are introduced in a columnar manner into the higher branch and are then raised up, in the manner of a liquid, in the lower branch of the tube, from where they can be removed individually by vacuum removers and can be positioned at any location, e.g. in the interior of a pressing machine. <IMAGE>

Description

BACKGROUND OF THE INVENTION The present invention relates to a component feeder, which provides a solution for the metering of metal or other material components made of sheet metal with high reliability, allowing the metering vacuum head mechanics to always transfer only one component from the feeder to the machining tool.

High-throughput extrusion technology is widely used in mass production. According to a variant of the stamping process, semi-finished products having a given geometry, e.g. circular plates (discs) are pressed and then this semi-finished product is fed to a press where the necessary tools are made and the component is manufactured. It is particularly advisable to use such technology in cases where the starting material is not available in predetermined standard sizes, e.g. for minerals of natural origin. These include eg. the mica. The mica insulation sheets used in the production of cathode ray tubes are produced essentially as described above. The mica sheets of various shapes in nature are first cut into molds and discs of a given size, and then fed into the presses for further processing and cutting.

This technology is used in many other applications, mainly for non-ferrous metals but also for plastics.

However, the addition of bulk thin discs presents a problem. It is known that the discs should be pre-sorted and collected in a magazine from which automatic feeding can take place.

Such a solution is described e.g. U. S. Patent No. 162,067, which relates to a thin disk dispenser. The essence of the solution is that the structure pre-assembles the parts in and out of the magazine. In the event that the dispenser dispenses more, usually two, than the required one, the excess is removed and transferred to a dedicated collection box.

The Hungarian patent specification HU 169,864 discloses an improved version of the preceding apparatus. The structure described herein allows the storage or other storage elements, e.g. from the vibrating feeder, transmitting the dispensed, more than one semi-finished product or component individually, temporarily stocking the excess dispensed components, if necessary, returning it to the magazine.

A common feature of the other solutions described above and used in practice is that each of the so-called "solutions". upper compartment structure. The semi-finished products and components to be dosed are subjected to the weight of the component column above them, which results in an increase in the frictional forces that inhibit the dosing. As a result, these dispensers are inaccurate and tend to double. When dosed with mica plates, this dosage is significantly influenced by the quality of the mica (curvature, inclusion, rumble, scratchiness).

Based on the unfavorable experience with overhead feeders, we have set ourselves the goal of overcoming the difficulties of overhead feeders, particularly doubling and other disadvantages due to column weight.

SUMMARY OF THE INVENTION The present invention provides a dispenser that uses the principle of approaching vessels to dispense flat parts. Our solution utilizes the phenomenon of part feeding, whereby flat parts superimposed in a tube, which by their shape fill the tube cross-section, act like a semi-liquid when vibrated, the system becomes "semi-fluid". Consequently, the system thus developed is subject to the physical laws of liquids, including the law of transport vessels.

Thus, when discs are introduced into one leg of a U-shaped tube and the tube is vibrated at a sufficient frequency and amplitude, the column formed by the discs is rotated on the other bent portion of the U-shaped tube on the other side. Thus, the column formed in one leg passes through the other column and, acting as a liquid, the column rises until the column height in the two legs is equalized.

We have used this phenomenon in the design of our dosing equipment. One leg of the U-tube was made longer than the other, and with proper photocell electronics, it was ensured that the column height was always higher than the other lower leg of the U-tube. Thus, it is possible to ensure that the low leg of the U-tube is always filled with discs and that a flat part can be lifted from the top of the rising column by means of a vacuum aspirator, e.g. mica plate and with a properly moved vacuum aspirator (vacuum head) this plate to the desired location, eg. can be transferred to a tool in the press.

The object of the present invention is therefore a vibrating Ua'ak tube having two legs of different heights. The flat parts fed into the higher leg form a column, which acts as a liquid in this system and rises to the upper end of the lower leg, and can be lifted individually with a vacuum nipple and dispensed as desired. They can be delivered.

List of drawings

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be better understood by reference to the drawings, and a specific embodiment will be illustrated in connection with the drawings, without limiting the invention to the specific example.

Figure 1 is a schematic diagram of a U-shaped conduit forming the core of the invention.

Figure 2: Side view of a sniffer dispenser.

Figure 3: Same as Figure 2 but top view.

Figure 4: Schematic diagram of the closure on the short shank 2 of the U-shaped transport tube 1.

Description of the Invention.

The following is a detailed description of a part dispensing apparatus operating on the principle of moving vessels which is the subject of the present invention.

Figure 1 is a sectional view of a U-shaped transport tube forming the core of the invention. The cross-section of the U-shaped transport tube 1 corresponds to the outline of the part 13 to be metered. It has a circular cross-section when feeding circular mica. The cross-section is 1 to 2 mm larger than the diameter of the parts to be dosed for the advantageous vibration transmission

183,552. The tube is thin-walled and has a wall thickness of max.

1.5-2 mm, made of brass or steel. One leg of the tube, marked 3 in the drawing, is significantly longer than the shorter leg 2. On the shorter shank 2 is attached the tube head 4 and the bounding plate 5, which are shown in detail in FIG.

Preferably, the flat parts 13 are introduced into the unequal U-shaped transport tube 1 by a vibrating feeder through the inlet nozzle 9. The

The direction of movement of the parts in the U-shaped passage is determined by the column pressure, but this requires a reduction in the friction between the pipe wall and the components so that the column pressure can be exerted. The reduction of friction is achieved by vibration by means of an electromagnetic actuator 10 mounted on a U-shaped transport tube 1 and held in vibration. As a result of the vibration, the components in the 1 U-shaped transport tube behave in a semi-liquid manner and fill it. The function of the tube head 4 and the baffle plate 5 mounted on the end of the shorter shaft 2 is to stop the upwardly directed column of parts by means of the baffle plate 5. This boundary plate is three-point and open in the direction of dosing indicated by the arrow in Figure 4. This open side forms the dosing gap.

On the longer leg 3, below the inlet nozzle 9, is the level control electronics 6, in which two inspection cups 14 and 15 are mounted, which monitor the upper and lower parts level 7 of the U-shaped transport tube 1. The output of the level control electronics is suitable for switching vibration feeders.

The vibration feeder (not shown) fills the U-shaped transport tube 1 through the inlet nozzle 9. When the metered flat parts 13 in the tube reach the upper part level 7, the electronics will turn off the vibration feeder and only turn it on again when the part pillar sinks to the lower level 8 by removal. The lower level 8 must be selected so that it is higher than the level at which the parts are taken up. The column pressure created by the level difference ensures that there is always a removable part at the boundary plate 5.

Figs. 2 and 3 are a side and plan view of the suction delivery device itself. The vacuum nozzle 16 is normally positioned above the shorter end of the shank of the U-shaped transport tube. The pneumatic cylinders 18 which move the vacuum dosing head 16 are in a positive end position. After the eccentric press is started (the press itself is not included in the figure because it is known and does not form part of the invention), when the press bear moves up from the main axis of the machine, a control signal is triggered from the electric microswitch operated by the track. For this signal an impulse appears on the output of the electronics or not, depending on the program you have set. If no output pulse is displayed, the machine will rotate without feeding (cleaning stroke). The purpose of this is to save tools, which can easily be used in dusty materials, eg. advantageous when cutting out mica sheets.

If a signal appears on the electronics output after the control input, this signal operates an electronically controlled monostable solenoid valve that actuates the pneumatic cylinders 18 and forces it from a positive end position to a negative end position. This movement, through the connecting bridge 19 and the shaft 20, which is drilled in its longitudinal axis for the path of vacuum or air, moves the vacuum dosing head 16 over the tool chair 17.

A vacuum is introduced into the vacuum dosing head 16 through the bore of the shaft 20. The vacuum nozzle 16 uses the vacuum to grip the uppermost flat part ¹⁰ at the end of the shorter leg 2 of the transport tube 1, e.g. a disk-shaped mica plate and, at the start of movement, moves it through the space provided by the bounding plate 5 in the direction indicated by the arrow in FIG. 4 above the tool slot 17. When this is done, the spring contact 21 will press the microswitch 22, which switches on an electromagnetically operated pneumatic valve. At the moment of switching, the valve disconnects the nozzle head 16 from the vacuum line and continues to connect to the pressurized air line. This overpressure blows the component (disc mica) from the nozzle head 16, which consequently falls into the tool slot 17.

The U-shaped transport tube 1 is mounted such that the end of the shorter shank 2 is at an angle of ²⁵ degrees to the plane of the tool. The same applies to the rotating plane of the bottom vacuum nozzle. The above a

Figure 2 clearly shows. The advantage of this few degrees of inclination is that there is no collision between the vacuum nozzle 16 and the metered flat part 13 at the edge.

Claims (5)

A part feeding device for conveying and separating solid semifinished products individually, characterized in that the solid semifinished products are fed by a vibrating U-shaped conveyor tube (1) having a cross-sectional shape corresponding to the half-finished product to be dosed and having stems of uneven length. . An embodiment of the device according to claim 1, characterized in that an alternating-current air gap electromagnet is mounted on the U-shaped transport tube (1). 45 (10). which keeps the entire U-shaped conduit in vibration, the longer leg (3) of the U-shaped conduit is equipped with level control electronics (6) which ensures that the extended flat parts (3) of the U-shaped conduit The level of 50 (13) is higher than the component level defined by the boundary plate (5) at the end of the shorter leg (2) of the U-shaped transport tube. An embodiment of the apparatus according to claim 2, characterized in that the U-shaped transport tube A vacuum dosing head (16) is connected to its shorter shank (2) for individually lifting the metered flat parts (13) and feeding it into the tool socket (17). An embodiment of the apparatus of claim 1, wherein the U-shaped transport tube is 60 (1) circular cross section. An embodiment of the device according to claim 1, characterized in that the stop plate (5) at the end of the shorter leg (2) of the U-shaped transport tube (1) and the rotation plane of the vacuum dosing head (16) are several degrees. 65 angles to the tool plane.