EP0681672A1

EP0681672A1 - Process for conveying thick matter containing preshredded scrap metal or similar solids.

Info

Publication number: EP0681672A1
Application number: EP94902701A
Authority: EP
Inventors: Karl Schlecht; Ulrich Schuster; Wolfgang Zey
Original assignee: Putzmeister Werk Maschinenfabrik GmbH
Current assignee: Putzmeister Concrete Pumps GmbH
Priority date: 1993-02-02
Filing date: 1993-12-07
Publication date: 1995-11-15
Anticipated expiration: 2013-12-07
Also published as: CA2154875A1; ATE150536T1; WO1994018501A1; DE59305912D1; EP0681672B1; US6158313A; US5988028A; JPH08507841A; DE4341607A1; EP0681672B2; JP3462876B2

Abstract

Thick matter and solids are conveyed together and substantially continuously through a conveyor pipeline. The thick matter is forced by a conveyor piston driven by a piston pump from a feed container into a conveyer cylinder. A forward face of the piston has a cutting crown with a cutting edge cooperating with an annular cutting ring to cut off solids projecting beyond an inlet in the conveyer pipeline.

Description

Method for conveying pre-comminuted metal scrap or similar solid materials containing solid bodies

description

The invention relates to a method for conveying shredded metal scrap or similar solid-containing thick materials, and to a method for conveying comminuted metal scrap, fused sheet metal parts or the like solids. The invention further relates to a device for conveying pre-comminuted metal scrap or thick materials containing the same solid.

To date, two methods have been used to incinerate special waste delivered in containers, in particular in drums made of sheet metal or plastic, in special waste incineration plants. In the first method, the barrels are brought into a combustion furnace, which is designed primarily as a rotary kiln, and are then crushed together with their contents at high temperatures. However, this leads to intermittent fluctuations in the combustion temperature, the amount of exhaust gas and the concentration of pollutants in the exhaust gas, so that the capacity of the plant has to be designed to be higher than with a continuous supply of special waste. In the second method, the filled containers, which also have to be incinerated due to their contamination with the special waste contained therein, are pre-shredded in a shredder. In a drum sieve, the scrap metal and other solids are separated from the special waste, which is usually in the form of a pasty or pasty slurry, before both fractions are then continuously fed to the incinerator. However, such a method requires devices for feeding the thick matter as well as for feeding the solids into the incinerator. When special waste and containers are burned together, there is also a burn-up of rusty, fused sheet metal or iron parts, which is predominantly in small pieces or granular form and which, due to its residual calorific value and to reduce the amount of combustion residues, should be used for renewed combustion.

Proceeding from this, the object of the invention is to develop a method and a device of the type mentioned at the outset which enable substantially continuous conveyance of pre-comminuted metal scrap or similar solid materials containing solid matter.

This object is achieved according to the invention by a method in which the thick matter containing the pre-comminuted metal scrap is pressed into a feed cylinder by a plunger-like feed piston from a feed container which is closely underneath the bottom of the feed piston and is closed or closed during each feed stroke and thereby via an inlet opening of the feed cylinder on the container side parts of the shot projecting into the feed cylinder are sheared off by the feed piston entering the feed cylinder with its front end. The invention is based on the idea of conveying the thick materials containing the pre-comminuted container scrap with a piston pump, since piston pumps have proven themselves excellently when conveying thick materials with different liquid contents, and in the course of the conveyance only crushing the container scrap that is in undiminished form would hinder the promotion.

With regard to the promotion of burn-up from melted sheet metal parts and the like, the object is achieved according to the invention in that the burn-up is mixed with a thick material or a liquid medium and the mixture is then conveyed from a delivery piston from the bottom of the delivery piston tightly encased and closed on each inlet stroke limited or closed feed container into a feed cylinder, whereby through a container-side inlet opening of the feed cylinder protruding sheet metal parts or the like from the feed piston are sheared off by the feed piston if the feed piston is used its front end enters the feed cylinder.

A preferred embodiment of the invention provides that the protruding parts between at least one peripheral edge at least partially surrounding the inlet opening of the feed cylinder and at least one leading past the edge at the entry of the feed piston into the feed cylinder with a small clearance, cutting edge arranged at the front end of the delivery piston are sheared off. Such a procedure enables only the solids to be comminuted, which are partly in the feed container and partly in the conveying cylinder when the delivery piston enters the delivery cylinder. The energy expenditure required for comminution is thereby significantly reduced.

According to an advantageous embodiment of the invention, the translatory movement of the delivery plunger is superimposed on a rotational movement about the delivery plunger axis during its advancing movement in order to improve the cutting action between the stationary edge and the cutting edge at the front end of the delivery plunger. The rotary movement of the delivery piston can, for example, take place hydraulically via a rotary piston of a drive cylinder.

In the event that larger or thicker solid bodies protrude from the feed cylinder into the feed container and cannot be easily sheared off, a further preferred embodiment of the invention provides that when a predetermined pressure in the pressure oil driving the feed piston is exceeded, the feed speed of the feed piston is reduced without reducing the delivery capacity of a drive pump driving the delivery piston. As a result, the feed force and thus the shear force for shearing larger solid bodies can be increased and reduced again after shearing off. If it is not possible to shear solid bodies between the delivery piston and the inlet opening by this measure, a further advantageous embodiment of the invention provides that the delivery piston is retracted when a predetermined pressure in the pressure oil circuit is exceeded and then pushed forward again. Due to the suction effect when the delivery piston is pulled back, solid bodies blocking the piston travel are displaced, so that during the subsequent pressure stroke of the delivery piston they are completely in the delivery line or in the feed container or penetrate the inlet opening of the delivery cylinder with a lower shear section. If the solids are not sheared off even with this measure, this process can be repeated automatically several times before the pump is stopped.

A further advantageous embodiment of the invention provides that the thick matter in the feed cylinder is prevented from being conveyed back during a suction stroke of the feed piston by closing a slide arranged in the feed cylinder, which slide is opened synchronously with the movement of the feed piston when the feed piston is completely retracted and closed when the delivery piston is fully extended.

With regard to the device, the object on which the invention is based is achieved in that the feed piston entering the feed cylinder during its feed movement has cutting means at its front end which cooperate with cutting means in the region of an inlet opening of the feed cylinder on the container side in order to shear off the solid bodies protruding from the feed container into the feed cylinder when the feed piston enters the feed cylinder. According to a preferred embodiment of the invention, the cutting means are formed by at least one edge that at least partially surrounds the inlet opening of the feed cylinder and at least one edge that is guided past the edge at a small distance when the feed piston enters the feed cylinder and is arranged at the front end of the feed piston. the edge and the cutting edge are preferably made of hard metal or hardened steel. While the edge is expediently formed on a cutting ring made of hardened steel or hard metal on the container-side end of the conveyor cylinder, the cutting edge is preferably on a cutting crown that can be detachably attached to the front end of the delivery piston between an end surface facing the delivery cylinder and one Arranged circumferential surface of the delivery piston. The circumferential cutting edge can be zigzag or wave-shaped in the conveying direction and / or in the radial direction, so that solid bodies protruding from the feed container into the conveying cylinder are not bluntly cut but sheared, thereby making it easier to separate the solid bodies. As an alternative to this or in addition, the edge of the inlet opening can also be zigzag or wavy.

According to a further advantageous embodiment of the invention, the zigzag-shaped design of the cutting edge is achieved in that it is formed by cutting bodies which are arranged next to one another in a ring shape and project forwardly beyond the cutting crown and which are expediently formed in one piece with the cutting crown.

In order to facilitate the introduction of the delivery piston, which is not guided in the area of the feed container, into the inlet opening of the delivery cylinder, the cutting crown arranged at the front end of the delivery piston, the outside diameter of which corresponds to the outside diameter of the delivery piston, expediently has Area of the cutting edge on a conical chamfer.

According to a further advantageous embodiment of the invention, the delivery plunger has at least one annular groove in the area of its front end face on its circumferential surface, through which the sealing of the annular gap measuring several tenths of a millimeter between the delivery plunger and the delivery cylinder is improved. The annular groove usually replaces elastic seals arranged at this point, which would be easily damaged by the metal parts being conveyed and would therefore be unusable.

However, since the annular groove or the annular grooves cannot prevent the entry of smaller metal parts into the annular gap between the delivery piston and delivery cylinder during the pressure stroke, an inner wall surface of a section of the delivery cylinder adjoining the feed container and one of the inner wall surface when the delivery piston is extended are opposed overlying outer peripheral surface of the delivery piston hardened. A hardening distortion occurring during the hardening of the conveyor cylinder section and the delivery piston can be compensated for in that the section of the delivery cylinder and the delivery piston are rotated so convexly during manufacture that the distortion during hardening leads to an incidence on exact cylinder surfaces.

In contrast to known piston pumps, in which the feed container in its lower part was always made deeper and wider than the delivery piston cross section in order to prevent wear of elastic seals arranged at the front end of the delivery piston, the lower part of the delivery container has According to a further preferred embodiment of the invention, the cross-section essentially corresponds to the cross-section of a preferably semicircular feed piston segment. By this measure it can be avoided that in the lower half of the delivery piston cross section metal parts protrude from the delivery line into the feed container, so that cutting means could be dispensed with in the area of the lower half of the delivery piston and the lower half of the inlet opening. As an alternative to this, symmetrically designed cutting means can also be reinstalled rotated by 180 degrees after one-sided wear. In order to prevent the circumferential surface of the feed piston from rubbing in the lower part of the feed container despite a slight deflection of the feed piston which is not guided in the feed container area and a surface of the bottom of the feed container which is rougher than the surface of the hydraulic cylinder, the cross section of the lower part is to be prevented of the feed container is preferably a few tenths of a millimeter larger than the delivery piston diameter. The bottom of the feed container can be designed as a releasably attachable lining made of wear plate.

A further preferred embodiment of the invention provides that the delivery piston is designed as a plunger cylinder and is hydraulically displaceable relative to a piston of a stationary piston rod engaging in the plunger cylinder, a pressure space arranged on the delivery side between the piston and the plunger cylinder being together with a pressure chamber arranged on the rod side between the piston and the plunger cylinder can be acted upon with pressure oil, and when the connection pressure exceeds a predetermined pressure, the connection is closed and the rod-side pressure chamber is connected without pressure to a backflow tank. If, in such an arrangement, the pressure chamber on the delivery side has a cross-section which is twice as large as the pressure chamber on the rod side, with a constant drive power a drive pump acting on the plunger cylinder with pressure oil, the feed force and thus the shear force at the front end of the delivery piston can be doubled by halving the feed speed become.

According to a further advantageous embodiment of the invention, a so-called bridge bridge is provided in the area of the feed container. rather arranged, which presses the thick matter into the feed container, and thus ensures that material bridges in the feed container are destroyed and that the thick matter can not escape upwards through a feed hopper of the feed container during the advancement of the feed piston, but through the feed hopper Inlet opening in the delivery cylinder.

In order to prevent the thick materials pressed into the delivery cylinder during the pressure stroke of the delivery piston during the suction stroke of the delivery piston being conveyed back into the feed container, a delivery cylinder which is arranged in the delivery cylinder and releases the delivery cylinder before a delivery stroke of the delivery piston and before a suction stroke of the Delivery piston provided the delivery cylinder closing slide, which is synchronized with the delivery piston and is arranged directly behind the point at which the front end of the delivery piston is located when the delivery piston is fully extended.

In order to ensure that the solids conveyed together with the thick matter cannot lead to a jamming of the slide, the slide has, according to the invention, a slide blade which is displaceable in a guide and engages in the feed cylinder and in which at least the edge opposite the guide has a wedge-shaped cross section in the feed direction. The wedge shape of the edge ensures that material that penetrates into the guide when the slide is withdrawn from the feed cylinder is easily pushed out again and does not get stuck in the narrow gap between the guide and the slide blade and thus jamming of the slide blade leads.

The edge of the slide blade opposite the guide is expediently adapted in its contour to the inside cross section of the cylinder and, when the slide is closed, it fits a stop opposite the guide in the feed cylinder and a stop with a semicircular shape, the inside cross section d Delivery cylinder corresponding stop surface.

When the slide is closed, any solid bodies in the slide path are pressed by the slide blade against the stop surface of the stop. The slide can then not be closed completely, but the clamped solid bodies also prevent the thick materials from flowing back from the feed cylinder into the feed container.

In order to improve the degree of filling in the feed container, it is proposed according to a preferred embodiment of the invention that a feed chute opening into the feed container and a preferably hydraulically actuable stop element which can be inserted into the feed chute in the direction of the feed container are provided. The stop element is expediently displaceable obliquely into the feed shaft, preferably into the feed container. In order to avoid the formation of bridges in the feed chute, a preferably hydraulically operable bridge-breaking member that can be introduced into the feed chute essentially transversely to the displacement path of the stop organ is advantageously provided, which can expediently be introduced into the feed chute transversely or obliquely in the direction of the feed container above the stop organ. To make assembly easier, the feed shaft has two flanges arranged obliquely on the shaft casing for fastening a stopper cylinder and a bridge breaker cylinder. When operating the conveyor device, care must be taken to ensure that the delivery piston, which is preferably designed as a plunger cylinder, the stop member, the bridge-breaking member and the slide are appropriately cyclically controlled via a central control.

The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing in a schematic manner. Show it

1 is a side view of a device according to the inven- fertilizer;

Fig. 2 is a plan view of the device of Fig. 1;

3 shows a longitudinal section through the device along the line A - A of FIG. 1.

FIG. 4 shows an enlarged illustration of section X from FIG. 3;

5 shows a front view of the front end of the delivery plunger;

FIG. 6 shows an enlarged view of section Y from FIG. 3 when the delivery piston enters the delivery cylinder; FIG.

7 shows a simplified schematic representation of the hydraulic drive of the piston pump;

8 is a front side view of the slide shown in FIGS. 1 and 2 in the installed state;

9 shows a cross section through the slide along the line C-C of FIG. 8;

10 shows the conveying device in a representation corresponding to FIG. 1 with feed shaft, stuffing cylinder and bridge breaker;

FIG. 11 shows an end view of the device according to FIG. 10;

12 is a plan view of the feed shaft of FIGS. 10 and 11.

The device shown in the drawing is to be used in order to supply liquid, pulp-like and pasty special waste delivered in drums to a rotary kiln for incineration essentially continuously. In addition, with this device, the part of the combustion from the rotary kiln, consisting of rusty, fused sheet metal parts or other unburned iron scrap, is to be fed to the rotary kiln again in order to reduce the amount of residual waste that arises after combustion and the calorific value of this part that is still present of the burn. While the drums with the special waste are pre-shredded in a shredder (not shown), the fused sheet metal parts separated from the erosion by magnetic separation are mixed with a liquid or pasty carrier material, preferably also liquid or pasty special waste, before doing so in each case resulting solid-thick mixture is fed into the rotary kiln with the device according to the invention.

The device shown essentially consists of a hydraulically driven single-piston pump 2, from the delivery piston 4 of which the solid / thick mixture is pressed from a feed container 6 via a delivery cylinder 8 into a delivery line leading to the rotary kiln (not shown). A slide 10 arranged behind the feed cylinder 8 and clocked in accordance with the movement of the feed piston closes the feed line before pulling back the feed piston 4 and thus prevents the mixture from being fed back into the feed container 6 when the feed piston 4 is pulled back.

In order to prevent sheet metal parts or other metallic solid bodies protruding from the feed cylinder 8 into the feed container 6 from jamming the feed piston 4 in the feed cylinder 8, the feed piston 4 has a cutting crown 14 made of hardened steel at the front end 12 when entering the feed cylinder 8 to shear off the protruding sheet metal parts or other solid body cooperates with a cutting ring 18 also made of hardened steel. The cutting ring delimits an inlet opening 16, through which the solid / thick mixture is pressed out of the feed container 6 into the feed cylinder 8.

The cutting ring 18 has a plurality of lubrication bores 172 which are arranged distributed over the circumference and open into a radially inwardly open annular groove 170. The lubrication holes are loaded with lubricating oil via a central lubrication system in the pump cycle at the moment the delivery piston 4 is immersed in the cutting ring 18. With these precautions, there is a considerable reduction in wear for the delivery cylinder 8 and the downstream delivery line (FIG. 6).

As can be seen from FIG. 3, the conveying cylinder 8 has an annular channel 178 which can be acted upon by cooling water via the connections 180 in the direction of the arrows 182. Water cooling becomes necessary when the medium to be pumped is permeated with steam.

To shear off the sheet metal parts, the cutting ring 18 has, on its end face 20 facing the feed container 6, an edge 22 surrounding the inlet opening 16, on which a cutting edge 24 of the cutting crown 14 guides the cutting crown 14 at a small distance when the feed piston 4 enters the feed cylinder 8 becomes. While the edge 22 of the cutting ring 18 is circular, the cutting edge 24 runs in a zigzag shape on a conical chamfer surface 28 which delimits a cylindrical circumferential surface 26 of the cutting crown 14 to the front, the chamfer surface 28 introducing the feed piston 4 which is not guided in the region of the feed container 6 to facilitate in the inlet opening 16. The zigzag-shaped cutting edge 24 borders a central circular end face 30 of the cutting crown 14, which protrudes forward and is formed in one piece with the cutting crown 14 and which surface 30 surrounded by a ring. The cutting bodies 32 have a triangular cross section in the tangential direction and are respectively delimited to the front by roof surfaces 36, 38, 40 which are inclined toward one another and towards the piston axis 34 and which cause the delivery piston 4 to enter the inlet opening 16 out of the Conveying cylinders 8 in the feed container 6 protruding sheet metal parts in the tangential and in radial direction relative to the guide surfaces 36, 38, 40 are displaced, whereby their shearing is facilitated.

The cutting crown 14 is detachably fastened with axial fastening screws 59 on a front end 41 of the delivery piston 4 facing the delivery cylinder 8. The threaded bores for the fastening screws 59 are arranged at regular angular intervals, so that the cutting crown 14 can be removed if the cutting edge 24 wears on one side and can be reattached after a rotation through a corresponding angle about the piston axis 34.

At a short distance behind the cutting crown 14, the conveying piston 4 has two or more annular grooves 39 arranged one behind the other on its circumferential surface 37. The annular grooves 39 have a rectangular cross section, the ratio between their depth and their width being approximately 1: 2. The distance between the two ring grooves 39 essentially corresponds to their width. The annular grooves 39 act as relief grooves and cause the pressure drop in the gap 41 between the circumferential surface 37 of the delivery piston 4 and the inner surface of the delivery cylinder 8 to be increased compared to a delivery piston without ring grooves, and thus the backflow of thick matter through the gap 41 during the Feed movement of the delivery piston 4 is difficult. The annular grooves 39 replace the elastic seals usually arranged at this point in piston pumps, which are not used in the piston pump according to the invention, since they would be quickly damaged or destroyed by the sharp sheet metal parts. The peripheral surface 37 of the delivery piston 4 is hardened in order to prevent small metal particles entering the gap 41 from causing damage to the peripheral surface 37.

The feed container 6 has two mutually opposite parallel walls 40, 42 in the conveying direction of the conveying piston 4, each of which is provided with a circular passage opening 44, 46 for the conveying piston 4. In the passage opening 44 in the wall 40 delimiting the feed container 6 to the feed cylinder 8, the annular cutting ring 18 is inserted against an annular flange 48 at the end of a first section 50 of the feed cylinder 8 on the container side in such a way that it wears by one-sided wear corresponding dimension can be rotated. A guide cylinder 52 of the single-piston pump 2 is connected to the passage opening 46 in the opposite wall 42 of the feed container 6, in which the delivery piston 4 is guided. To the sides and downwards, the feed container 6 is delimited by a trough 56 lined with wear plates 54, the lower part of which has a semicircular cross section. The diameter of the semicircular part of the tub cross section is only a few tenths of a millimeter larger than the diameter of the delivery piston 4, so that it is ensured that on the one hand the delivery piston 4 does not rub against the tub 56, but on the other hand also during the advance of the delivery piston 4 no sheet metal parts or other solids get into the gap between delivery piston 4 and tray 56. As a result of this measure, when the cutting crown 14 enters the delivery line 8, sheet metal parts protrude from the feed container 6 into the delivery line 8 only in the upper part of the tub 56, so that on the one hand the feed force of the delivery piston 4 required for shearing off the sheet parts is reduced, and on the other hand in the lower half of the cutting ring 18 and the cutting crown 14 there is no wear of the edge 22 or the cutting edge 24. After wear of the edge 22 or the cutting edge 24 in the upper part of the cutting around 18 or the cutting crown 14, they can thus be rotated 180 degrees around the piston axis 34 and thus their life can be doubled.

At its upper edge 58, the feed container 6 is provided with a horizontal screw flange 60, onto which a filling funnel or feed shaft 200 can be placed. The feed shaft is provided with two obliquely aligned jacket flanges 202, 204 which are equipped with a hydraulic stuffer cylinder 206 and a hydraulic bridge breaker cylinder 208. The tamper cylinder 206 has a piston rod 210 designed as a stop member, which can be displaced obliquely in the direction of the feed container 6 into the feed shaft 200. The bridge breaker cylinder 208 has a piston rod 212 which is displaceable transversely to the displacement direction of the stop member 210 and is designed as a bridge breaker and which passes through the feed shaft 200 transversely when shifted. At its upper end, the feed shaft 200 is provided with a horizontal screw flange 214, to which a feed channel (not shown) can be flanged. As long as the delivery piston 4, which is designed as a plunger cylinder, is displaced into its rear end position, the solid / thick material mixture can reach the feed container 6 via the feed shaft 200. As soon as the delivery piston 4 is displaced in the conveying direction, the stop element 210 is also displaced in the direction of the feed container 6, taking the mixture in front of it, so that compression and thus a good degree of filling result. As soon as the delivery piston 4 dips into the delivery cylinder 8, the stop member 210 is moved back into its end position so that new material can be conveyed from above. If the delivery piston 8 is then moved back again, releasing the material opening in the feed container, the bridge breaker 212 is actuated in order to sever material bridges possibly occurring in the feed shaft 200. The control of the delivery piston 8, the slide 10, the stuffing cylinder 206 and the bridge breaker cylinder 208 takes place via a central control according to a defined cycle (Figs. 10 to 12).

The first section 50 of the feed cylinder 8, which adjoins the feed container 6 and extends to the slide 10, has a cylindrical tube wall 43 made of hardened steel in order to prevent damage to the inner wall surface due to the gap 41 between it and the feed piston Prevent 4 penetrating metal particles. A hardening distortion occurring during hardening of the cylindrical tube wall 43 can be compensated for by the tube wall 43 being convexly pre-turned before hardening, so that the hardening distortion leads to the creation of an exactly cylindrical inner wall surface.

The guide cylinder 52 adjoining the wall 42 of the feed container has on its inner circumferential surface 49 in the area of the passage opening in the wall 42 a wiper 51 and immediately behind the wiper 51 a plurality of sealing rings 53 * and guide bands 55 arranged one behind the other in the conveying direction on. While the scraper 51 and the sealing rings 53 prevent the entry of thick materials between the delivery piston 4 and the guide cylinder 52, the guide belts 55 serve to guide the delivery piston 4 in the guide cylinder 52. The gap between the guide cylinder 52 and the delivery piston 4 is via the Lubrication holes 174 in the direction of arrows 176 are charged with lubricating oil via a central lubrication system.

7, the delivery piston 4 is designed as a plunger cylinder 57, which is displaceable relative to a piston 58 of a piston rod 60 arranged in a stationary manner in the guide cylinder 52. The piston rod 60 has two pressure oil channels 66, 68, each of which can alternatively be connected to a pressure oil supply line 62, 64 leading to a drive pump 80 or to a return flow line 78, 79 leading to a return flow tank 76, and one of which leads into a delivery side between the piston 58 and the plunger cylinder 57 arranged pressure chamber 70 and the other opens into a pressure chamber 72 arranged on the rod side between the piston 58 and the plunger cylinder 57. The effective piston area in the delivery-side pressure chamber 70 is twice as large as the effective piston area in the rod-side pressure chamber 72, since the cross-section of the piston rod 60 is half the size of the cross-section of the delivery-side pressure chamber 70. The two pressure rooms 70, 72 are connected to one another by a closable connecting line (not shown) which is opened when the two pressure spaces 70, 72 are pressurized together with pressure oil (differential control), so that pressure equalization is produced and pressure oil from the pressure chamber on the rod side 72 can be conveyed to the delivery-side pressure chamber 70.

The pressure in the pressure oil channel 68 is monitored by two pressure transducers 76, 77, which each apply a control signal 82 to a control unit 82 when a predetermined pressure is exceeded during the advance movement of the plunger cylinder 57.

In normal operation of the device, both pressure spaces 70, 72 are actuated in differential control when the compensating line is open and are pressurized via the pressure oil supply lines 62, 64 and the pressure oil channels 66, 68 connected to them. Since only the rod surface is available as the active surface, the plunger cylinder 57 is advanced with a relatively low feed force, but with a relatively high feed speed. However, if a sheet metal strip with a greater thickness of material protrudes from the delivery piston 8 when it enters the delivery line 8 and does not easily shear between the edge 22 and the cutting edge 24, this builds up in the pressure chambers 70, 72 and in the pressure oil channels 66, 68 a pressure which, when the predetermined value at the first pressure transducer 76 is exceeded, leads to the control unit 82 closing the connection of the pressure oil channel 66 to the pressure oil supply line 62 and the pressure chamber 72 with the Return flow line 78 connects so that only the delivery-side pressure chamber 70 is pressurized with pressure oil, while the rod-side pressure chamber 72 is depressurized. As a result, the feed force and thus the shear force between the cutting edge 24 and the peripheral edge 22 are doubled, while the feed speed is halved, with the same delivery capacity of the drive pump 80.

If the doubling of the feed force does not lead to shearing of the sheet metal strip clamped between the cutting edge 24 and the edge 22, the pressure in the pressure oil circuit increases further until it exceeds the predetermined value at the second pressure sensor 77 and the control unit 82 from this is fed a signal. The control unit 82 then connects the pressure oil channel 68 to the return flow line 79 and the pressure oil channel 66 to the pressure oil supply line 62, so that now only the pressure chamber 72 on the rod side is pressurized and the plunger cylinder 57 is withdrawn. When the feed plunger 4 is pulled back, the suction in the feed container 6 causes the thick matter to collapse, whereby the metal strip blocking the feed movement of the feed plunger 4 is also displaced. After reaching its end position, the plunger cylinder 57 is pushed forward again, the pulling back and the pushing forward being able to be repeated several times before the piston pump is stopped for manual removal of the sheet metal strip.

The slide 10 arranged in the delivery line 8 essentially consists of a slide blade 94 guided in a slide flange 92 which is displaceable in the vertical direction, which completely releases the delivery line 8 when the slide 10 is open and completely closes it when the slide 10 is closed. The spade-shaped slide blade 94 is displaceable by means of two hydraulic cylinders 96, 98, each with its piston rod 100 on the slide blade 94 and with its cylinder 102 on the slide flange 92 built into the delivery line 8 attack.

The part of the slide blade 94 which engages in the delivery line 8 is delimited at the bottom by a semicircular edge 104 which is adapted to the inner cross section of the delivery line 8 and which, when the slide 10 is closed, has a semi-cylindrical stop surface 106 on a likewise semi-cylindrical stop surface 108 one between two parallel flange plates 110, 112 of the slide flange 92 inserted stop plate 114 abuts. Above the conveying line 8, the slide blade 94 is guided in a guide shaft 116 arranged between the flange plates 110, 112 with a guide slot 118 which is rectangular in cross section, the opposite wide side surfaces 122 of which are the narrow side surfaces 124 of the slide blade 94, each with a free opening of a narrow one Gap 120 opposite.

The edge 104 of the slide blade 94 in the conveying direction has a cross-section which tapers in a wedge shape towards the stop surface 106, which ensures that metal particles which, when the slide blade 94 is pulled out of the conveyor line 8, enter the narrow gap 120 between the slide blade 94 and the Guide shaft 116 reach, when the slide blade 94 is subsequently pushed into the conveyor line 8, it is pushed back out of the gap 120 toward the conveyor line 8 and does not get stuck between the slide blade 94 and the guide shaft 116.

The guide shaft 116 is formed in two parts, the lower part 126 being supported against a ring 128 delimiting the flange plates 110, 112 towards the inside of the delivery line 8, and the upper part 130 being opposed by adjusting screws 132 engaging in threaded holes in the flange plates 110, 112 a sealing set 134 resting on the upper side of the lower part 126 is pulled. The sealing set 134 is made of elastic seals 136, 138 running around the slide blade 94 thereby pressed together, the seals 136, 138 bearing against the slide blade 94.

The two sections of the delivery line 8 in front of and behind the slide 10 are each held by fastening screws 140 which engage in threaded holes in the flange plates 110, 112 on the flange plates 110, 112 and are themselves connected to one another by connecting screws 142.

The slide blade 94 is also formed in two parts, the lower part, which engages in the guide slot 118 of the guide shaft 116, being connected by retaining screws 144 to the upper part, which projects transversely to the conveying direction over the flange plates 110, 112 and points downwards Has cylindrical receptacles 146, in which cylindrical pins 148, each protruding from the end of the piston rods 100 of the hydraulic cylinders 96, 98, are fastened with retaining bolts 150.

On the cylinder side, the hydraulic cylinders 96, 98 are pivotably mounted on swivel bolts 152, which are inserted into brackets 154 projecting laterally beyond the flange plates 110, 112.

A closed sheet-metal housing 156 is placed on the flange plates 110, 112, in which the slide blade 94 moves upwards, protected against external influences, when it is pulled out. In the wall 158 of the sheet metal housing 156, two proximity switches 160, 162 are inserted, which each respond in the upper and lower end positions of the slide blade 94 when a flange 164 projecting beyond the slide blade 94 in the conveying direction approaches.

The signal supplied by the limit switches of the control unit 82 is used to supply the pressure oil to the hydraulic systems each time the upper or lower end position of the slide blade 94 is reached. close like cylinders 96, 98 and then initiate the feed movement or the retraction of the delivery piston 4, which is synchronized with the slide 10.

The slide 10 is arranged in the conveying direction immediately behind the point in the conveying line 8 at which the front end 12 of the conveying piston 4 is fully extended. It is thereby achieved that when the delivery piston 4 is withdrawn, there is no longer any thick matter in the delivery cylinder 8 on the container side of the slide 10, which is sucked back to the feed container 6.

Claims

1. A method for conveying shredded metal scrap or similar solid materials containing thick matter, characterized in that the Dickεtoffe from a plunger-like feed piston (4) from a feed piston (4) with its bottom closely encompassing and closed during each feed stroke, limited or closed feed tube containers (6) are pressed into a delivery cylinder (8), whereby solid bodies projecting beyond an inlet opening (16) of the delivery cylinder (8) from the delivery piston (4) entering the delivery cylinder (8) with its front end end be sheared off.

2. Method for conveying shredded metal scrap, molten sheet metal parts and similar solid bodies, characterized in that the solid bodies are mixed with a thick substance or with a liquid medium and the mixture is then conveyed by a plunger-like conveying piston (4). a feed cylinder (8) is pressed into a feed cylinder (8) from a feed container (6), which closely encloses the bottom of the feed piston and is closed or closed on each feed stroke, solid bodies protruding through an inlet opening (16) on the feed side (16) of the feed cylinder (8) are sheared off by the delivery piston (4) entering the delivery cylinder (8) with at least one front end.

3. The method according to claim 1 or 2, characterized in that the solid between at least one of the inlet edge (16) surrounding edge and at least one when the feed piston (4) in the feed cylinder (8) with little distance past the edge , at the end of the delivery piston (4) arranged cutting edge (24) are sheared off.

4. The method according to any one of claims 1 to 3, characterized ge indicates that the translational movement of the delivery piston (4) is superimposed on a rotary movement.

5. The method according to any one of claims 1 to 4, characterized gekenn¬ characterized in that the feed force deε Förderkolbenε (4) is increased when exceeding a predetermined pressure in a conveyor piston (4) driving medium.

6. The method according to any one of claims 1 to 5, characterized gekenn¬ characterized in that the delivery piston (4) when exceeding a predetermined pressure in a drive the delivery piston (4) driving the medium is withdrawn and then pushed forward again.

7. The method according to one of claims 1 to 6, characterized in that a slide (10) arranged in the delivery cylinder (8) is closed before a suction stroke of the delivery piston (4).

8. The method according to claim 7, characterized in that when closing the slide (10) in the displacement of an in the feed cylinder (8) engaging slider blade (94) be¬ Feßtkörper between the slide blade and a wall of the feed cylinder are clamped.

9. Device for conveying thick matter, in particular for conveying shredded metal scrap or similar solid matter containing solid matter, characterized by a piston pump (2) with a plunger-like delivery piston (4), from which the thick matter from a feed container (6) into a delivery cylinder (8 ) are pressed, the delivery piston (4) having cutting means (14, 24) on its front end (12) entering the delivery cylinder (8), which is equipped with cutting means (18, 22) in the area of a container-side inlet opening (16) of the feed cylinder (8) cooperate and wherein a lower part of the feed container (6) has a cross section substantially corresponding to the cross section of a delivery piston segment.

10. The device according to claim 9, characterized in that the cutting means (18, 22) by at least one edge (22) of the feed cylinder (8) of the feed cylinder (8) at least partially surrounding edge (22) and at least one when the feed piston () 4) formed in the feed cylinder (8) with a small distance past the edge (22) and at the front end (12) of the feed piston (4) arranged cutting edge (24).

11. The device according to claim 10, characterized in that the edge (22) and the cutting edge (24) consist of hard metal or hardened steel.

12. The apparatus of claim 10 or 11, characterized gekennzeich¬ net that the edge (22) on a container-side end of the delivery cylinder (8) arranged cutting ring (18) made of hardened steel or hard metal is formed.

13. Device according to one of claims 10 to 12, characterized ge indicates that the cutting edge (24) on a at the front end (12) of the delivery piston (4) detachably attachable cutting crown (14) is arranged.

14. Device according to one of claims 10 to 13, characterized ge indicates that the cutting edge (24) between at least one of the delivery cylinder (8) facing end face (30) and at least one peripheral surface (26) of the delivery piston (4) is arranged.

15. The device according to one of claims 10 to 14, characterized ge indicates that the cutting edge (24) is zigzag or wel¬ leniform.

16. The device according to one of claims 10 to 15, characterized ge indicates that the cutting edge (24) a conical chamfer (28) at the front end of the cutting crown (14) limits to the front.

17. The apparatus according to claim 16, characterized in that the cutting edge (24) from the front over a Schneid¬ crown body (15) protruding cutting bodies (32) is formed.

18. The apparatus according to claim 17, characterized in that the cutting body (32) are integrally formed with the Schneidkronenkör¬ per (15).

19. The apparatus of claim 17 or 18, characterized gekennzeich¬ net that the cutting body (32) are arranged in a ring shape next to each other and have a triangular cross-section in the tangential direction.

2 0. Device according to one of claims 17 to 19, characterized in that the cutting bodies (32) are delimited by guide surfaces (36, 38, 40) inclined towards one another.

21. Device according to one of claims 16 to 20, characterized in that the outer diameter of the cutting crown (14) corresponds to the outer diameter of the delivery piston (4).

22. The device according to one of claims 9 to 21, characterized in that a part (50) of the feed cylinder (8) on the feed container (6) is subsequently made of hardened steel.

23. The device according to claim 22, characterized in that the portion (50) extends at least to the point at which the conveyor is fully extended. the piston (4) whose front end (12) is located.

24. Device according to one of claims 9 to 23, characterized ge indicates that the delivery piston (4) has a hardened circumferential surface (37).

25. Device according to one of claims 9 to 24, characterized ge indicates that the lower part of the feed container (6) has a semi-circular cross-section with a slightly larger diameter than the delivery piston diameter.

26. The device according to one of claims 9 to 25, characterized ge indicates that the feed container (6) is provided at least in its lower part with a releasably attached lining (54).

27. Device according to one of claims 9 to 26, characterized in that the delivery piston (4) has at least one annular relief groove on its circumferential surface in the region of its front end (12).

28. Device according to one of claims 9 to 27, characterized ge indicates that the delivery piston (4) is rotatable about a piston axis (34) during a feed movement.

29. Device according to one of claims 9 to 28, characterized in that the delivery piston (4) acts as a plunger cylinder

(57) is formed.

30. The device according to claim 29, characterized in that the plunger cylinder (57) hydraulically opposite a piston

(58) of a stationary piston rod (60) which engages in the plunger cylinder (57) can be displaced, a pressure chamber arranged on the delivery side between the piston (58) and the plunger cylinder (57) during a pressure stroke (70) together with a pressure chamber (72) arranged on the rod side between the piston (58) and the plunger cylinder (57) can be pressurized with pressure oil, and if a predetermined pressure in the pressure chambers (70, 72) is exceeded while closing a connection between the pressure chambers (70, 72) the delivery-side and / or rod-side pressure chamber (72) can be switched pressure-free.

31. Device according to one of claims 9 to 30, characterized by a device arranged in the region of the feed container (6) for pressing the thick substances into the feed container (6) and / or for holding the thick substances in the feed container (6 ) during a pressure stroke of the delivery piston (4).

32. Device according to one of claims 9 to 31, gekennzeich¬ net by a in the delivery cylinder (8) arranged, before ei¬ a pressure stroke of the delivery piston (4) releasing the delivery cylinder (8) and before a suction stroke of the delivery piston (4) the delivery cylinder (8) closing slide (10).

33. Device for conveying pre-comminuted metal scrap or similar solid materials containing solid matter, characterized by a piston pump (2) with a delivery piston (4), from which the thick materials from a feed container (6) into a delivery cylinder (8) are pressed, a slide (10) releasing the feed cylinder (8) before a pressure stroke of the feed piston (4) and closing the feed cylinder (8) before a suction stroke of the feed piston (4), the slide (10) being in a guide (116, 118) has a displaceable slide blade (94) which engages in the conveying line (8) and in which at least the edge (104) opposite the guide (116, 118) has a wedge-shaped cross section in the conveying direction .

34. Device according to claim 33, characterized in that the shape of the edge (104) opposite the guide (116, 118) is adapted to the inner cross section of the feed cylinder (8).

35. Apparatus according to claim 33 or 34, characterized gekennzeich¬ net that the guide (116, 118) has at least one against the slide blade (94) abutting seal (136, 138).

36. Device according to one of claims 32 to 35, characterized ge indicates that the slide (10) is arranged in the conveying direction at a small distance behind the point at which the front end face (12) of the fully extended delivery piston (4) is located .

37. Device according to one of claims 9 to 36, characterized ge indicates that the feed cylinder (8) has a ring channel (178) which can be acted upon with cooling water.

38. Device according to one of claims 12 to 37, characterized ge indicates that the cutting ring (18) distributed over the circumference, arranged inwardly open, preferably opening into a radially inwardly open annular channel (170), in the pump cycle a central lubrication system has lubrication holes (172) which can be loaded with lubricating oil.

39. Device according to one of claims 9 to 38, characterized by a feed chute (200) opening into the feed container (6) and a preferably hydraulically actuable insertable into the feed container (6) in the feed chute (200) Stop organ (210).

40. Apparatus according to claim 39, characterized in that the stop member (210) is slidable into the feed chute (200), preferably up to the inlet side of the feed container (6).

41. Apparatus according to claim 39 or 40, characterized by a preferably hydraulically actuated bridge-breaking member (212) which can be inserted into the feed shaft (200) essentially transversely to the displacement path of the stop member (210).

42. Apparatus according to claim 41, characterized in that the bridge-breaking member (212) above the stop member (210) can be inserted transversely or obliquely in the direction of the feed container (6) into the feed shaft (200).

43. Device according to one of claims 39 to 42, characterized ge indicates that the delivery piston (4), the stop member (210), the bridge-breaking member (212) and the slide (10) can be controlled cyclically via a central control.