GB2085388A - Apparatus for pneumatically conveying bulk material - Google Patents
Apparatus for pneumatically conveying bulk material Download PDFInfo
- Publication number
- GB2085388A GB2085388A GB8127855A GB8127855A GB2085388A GB 2085388 A GB2085388 A GB 2085388A GB 8127855 A GB8127855 A GB 8127855A GB 8127855 A GB8127855 A GB 8127855A GB 2085388 A GB2085388 A GB 2085388A
- Authority
- GB
- United Kingdom
- Prior art keywords
- conveying
- conveyor
- conduit
- control unit
- electronic control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/52—Adaptations of pipes or tubes
- B65G53/521—Adaptations of pipes or tubes means for preventing the accumulation or for removal of deposits
Abstract
Apparatus for pneumatically conveying bulk material, includes a conveying agent secondary conduit (5) disposed parallel to a conveyor conduit (1) and communicating with the conveyor conduit (1) via controllable valves (V1 to V4) along the conveying path, and pressure sensors (S1 to S5) arranged at spacings on the conveyor conduit for controlling said valves. The sensors (S1 to S5) are in the form of electrical pressure transmitters connected by lines (10) to an electronic control unit (11) which produces a logic combination of the output signals of the pressure transmitters with parameters such as pressures, pressure differences, intervals of time and frequencies, which characterise the conveying condition and which are inputted as reference values. The unit (11) in the event of the actual conveying condition deviating from the reference conveying condition, electrically actuates the controllable valves (V1 to V4) by way of further lines (12). An electrical gas flow rate meter which is connected to the control unit (11) can additionally be provided in the apparatus. <IMAGE>
Description
SPECIFICATION
Apparatus for pneumatically conveying bulk material
This invention relates to an apparatus for pneumatically conveying bulk material.
An apparatus of this kind has been proposed in the literature (Verfahrenstechnik 12 (1978) 4, page 200,
Figure 12), andcomprises a conveyor conduit with a conveying agent secondary conduit disposed para llelthereto; additional conveying agentflowing over from the secondary conduit into a conveyor conduit portion when the pressure drop in the respective conveyor conduit portion in question exceeds an adjustable value.For this purpose, diaphragms are to be fixed at spacings on the conveyor pipe, and the diaphragms each act by way of a piston on a common balance linkage, wherein the respective upstream piston is fored at the same time as a valve which, when a reference value in respect of the differential pressure, which is predetermined by a spring, is exceeded, opens a tap or connecting conduit which connects the secondary conduit to a plurality of air in-feed locations on the conveyor conduit. Apart from the fact that this complicated mechanism is an impediment to such an apparatus being made in an economically viable fashion, such an apparatus would suffer from the disadvantage that the reference value spring would have to have a considerable preloading so that small fluctuations in pressure cannot trigger undesirable valve flutter.So that the preloading force can be overcome by the mechanically sensed differential pressure, the diaphrams must also be designed with a particularly large area, in accordance with the relationship 'force = pressure x area'. This makes the pressure-sensing and pressure-transmitting elements large and accordingly expensive. For conveyor conduits of up to about 80 mm in diameter, they are too large because in that case the tube curvature is too great for the flat diaphragms. In addition, the large diaphragms are too sensitive to pressure shocks and to the wear which is caused by the flow of solid material.In addition, the large diaphragms give rise to high levels of penetration between the conveyor conduit and the pressure sensors, which results in solid material being deposited at the diaphragm, and such deposits in the course of time detrimentally affect the pressure sensing function of the diaphragms.
German patent specification No 1 781 025 also discloses a phenumatic conveyor apparatus comprising a conveying agent secondary conduit which is disposed parallel to the conveyor conduit, additional conveying agent being passed into the conveyor conduit from the secondary conduit by way of controllable valves. Measuring means are arranged on the conveyor conduit, upstream of the controllable valves. The controllable valves are actuated by the signals produced by the measuring means. The technical purpose of this known conveyor apparatus is to move the bulk or loose material to be conveyed, through the conveyor conduit, in individual plugs which nrn senarated bv cushions of conveying agent.So that the individual plugs do not run together, additional conveying agent is introduced into the conveying agent cushions between the plugs, along the path of the conveying action. For this purpose, the measuring means, the measuring principle of which is based on light beams or radioactive beams, register whether there is a block or a conveying agent cushion at the location at which the additional infeed of conveying agent occurs.
DAS No 20 22 962 discloses a further conveyor apparatus comprising a conveying agent secondary conduit which is disposed parallel to the conveyor conduit and from which additional conveying agent is fed by way of valves into the conveyor conduit, along the conveyor path. The technical aim of this apparatus lies in rendering the pressure drop along the conveyor path uniform. As however the in-feed valves of this known apparatus are not controllable, it is not possible to make any prediction at all as to how much additional conveying agent flows into the individual conveyor conduit sections, along the conveying path.However, as long as the feed of additional conveying agent into the conveyor conduit cannot be controlled, it is also not possible to predetermine the manner in which the pressure pattern in the conveyor conduit is altered by the feed of conveying agent into the conveyor conduit.
DAS No 22 19 199 also discloses a conveyor apparatus comprising a conveying agent secondary conduit which is disposed parallel to the conveyor conduit and from which additional conveying agent flows into the conveyor conduit, by way of initial pressure-controlled valves. The valves which are arranged in the conveying agent secondary conduit force a defined pressure drop to be produced in the conveying agent secondary conduit along the conveyor section. The technical aim of this apparatus is to convey bulk material in plug form with automatic control of the addition of air in the event of disturbances in the conveying action.A serious disadvantage of this known apparatus is that additional conveying agent only flows out of the secondary conduit into the conveyor conduit, towards the end of the conveyor conduit, if the conveyor conduit has been pumped up from the beginning to the respective position in question (see column 4, lines 54 to 62). However, this involves an unncessarily high consumption of air and therefore uneconomical operation, with blockages in the conveyor conduit being broken up only after a delay.
DAS No 23 05 030 also discloses a pneumatic conveyor apparatus comprising a conveying agent secondary conduit which is disposed parallel to the conveyor conduit and from which additional conveying agent flows into the conveyor conduit by way of valves. In this conveyor apparatus, at the place where, as viewed in the direction of flow, the pressure in the conveying agent secondary conduit first exceeds the pressure in the conveyor conduit, the secondary conduit is closed off and at that point permits additional conveying agent to flow from the secondary conduit into the conveyor conduit.A disadvantage of this conveyor apparatus is that, during the conveying operation, additional con veying agent can flow from the secondary conduit into the conveyor conduit only at a single position on the entire conduit, and this is not sufficient for interference-free and energy-saving operation of the apparatus.
DOS No 2403 533 discloses a further pneumatic conveyor apparatus with a conveying agent secondary conduit which is disposed parallel to the conveyor conduit, additional conveying agent flowing from the secondary conduit into the conveyor conduit by way of valves. In this arrangement, the flow of additional conveying agent from the secondary conduit into the conveyor conduit is controlled in such a way that, as viewed in the direction of flow, the first valve produces a compressed air shock in the conveyor conduit, then the next valve, then the next, and so on, with the compressed air shocks taking place in an increasingly more rapid succession, in accordance with the increase in the flow spped along the conveyor section. When the compressed air pulse reaches the end of the secondary conduit, a pressure sensor provides for repetition of the cycle.This conveyor system also suffers from the disadvantage that additional conveying agent can be used to influence the conveying operation, at a given time, only at a single point on the conveyor section, in each case.
DOS No 2412142 discloses a conveyor apparatus comprising a conveying agent secondary conduit which is disposed parallel to the conveyor conduit and from which additional conveying agent is introduced into the conveyor conduit by way of injectors.
With this apparatus, the loose material to be conveyed is introduced into the conveyor conduit in portions. With this arrangement, the inidividual portions of loose material are allegedly moved forwards in a 'pulse-like manner', with the material being alternately moved and stopped'. In accordance with this condition of oscillation in the coveyor conduit, additional conveying agent is said to flow into the conveyor conduit by way of the air injectors in the same phase or in a phase-shifted manner, along the conveyor section. The injectors are controlled either by way of conveying agent intermediate containers along the conveyor section, or by way of a time control means.If we just disregard the fact that the above-indicated specification does not give any indication at all as to what difference in effect is achieved, as between inphase opening and phaseshifted opening of the air injectors, and what is actually meant by the expression phase, this air injector control arrangement suffers from the serious disadvantage that it does not provide for detection of the instantaneous condition of oscillation at various points on the conveyor conduit, and that there is also no feed-back in respect of the effect of the additional supply of conveying agent, to the control means. However, that is an absolutely essential condition if the oscillation in the conveyor tube, which is increasingly damped by friction towards the end of the conveyor section, is to be continuously re-excited and maintained.With this known conveyor apparatus therefore, it may happen that the desired oscillation is additionally damped and finally terminated by introducing air at the wrong time or at the wrong places, and that results in the pulse conveying action collapsing.
Finally, German patent specification No 2550164 discloses a pneumatic conveyor apparatus in which additional conveying agent flows into the conveyor conduit by way of valves from a conveying agent secondary conduit which is disposed parallel to the conveyor conduit; as regards design and purpose, this construction substantialiy corresponds to the conveyor apparatus disclosed in DAS No 23 05 030.
The only difference is that a plurality of flow transfer locations are arranged between the secondary conduit and the conveyor conduit, between each two valves which are provided for closing off the secondary conduit. This apparatus also suffers from the disadvantage that additional conveying agent can flow into the conveyor conduit as a given time only in a single portion of the conveyor conduit. Portions of the conveyor conduit which are disposed upstream and downstream of the above-mentioned portion cannot be influenced by the system, at that moment.
There is thus a need for a generally improved pneumatic conveyor apparatus of the general kind set forth hereinbefore, which permits pneumatic conveying of loose materials, in particular loose materials of different properties, in the same conveyor conduit, with maximum protection from trou ble, with a low level of power consumption and with a low degree of apparatus wear.
According to the invention, there is provided apparatus for pneumatically conveying bulk material, including a conveying agent secondary conduit disposed parallel to a conveyor conduit and is connected to the conveyor conduit via controllable valves along the conveyor path, and pressure sensors arranged at spacings on the conveyor conduit, for controlling said valves, which pressure sensors are electrical pressure transmitters connected by lines to an electronic control unit which produces a logic connection of the output signals of the pressure transmitters to parameters which are introduced as reference values and which characterise the conveyor condition such as pressures, pressure differences, time intervals and frequencies, the electronic control unit being operable, when the actual conveying condition deviates from the reference conveying condition, electrically to actuate the controllable valves via further lines.
This solution may be briefly summarised to the effect that, unlike all known apparatuses, in the apparatus proposed herein, use is made of the principle of feed-back to the control means, of information concerning the change in the conveyor operation which is produced by the input of additional conveying agent, thereby providing for adaptive control of the conveyor operation simultaneously and over the entire conveyor section, so that the conveyor operation can be locally and positively influenced, in accordance with freely selectible control criteria.
The present proposal made it possible for the first time to solve different conveying problems, using the same apparatus. Different kinds of conveying problems arise by virture of the fact that entirely different flow conditions must be embodied in the conveyor conduit for different products, in order to achieve a conveying action which is satisfactory from the power point of view and which provides for careful treatment of the products to be conveyed.
Thus, certain powders may be conveyed at the slowest speed and without the danger of blockage, by a vibration being impressed on the gas-solid flow, that vibration ensuring that, on a time average, the adhesion forces between the particles are overcome for the major part, thereby eliminating the formation of lumps in the product and preventing the product from caking on the conveyor conduit. The vibration which is impressed at the beginning of the conveyor section is however damped by internal friction and friction at the conduit, along the conveyor section.
The apparatus according to the invention is the first that makes it possible for the oscillation to be maintained by introducing compressed gas pulses, in the proper rhythm, at suitable positions on the conveyor conduit In accordance with developements of the apparatus, as set forth in the subsidiary claim, it is also possible for the oscillation which manifests itself in fluctuations in pressure to be rendered visible for example by means of a recording pen apparatus or an oscillograph, and in this way optically to monitor the maintenance or re-excitation of the condition of oscillation. Another advantageous possibility lies in using automatically operating optimisation programme within the control means, for the same purpose.
When dealing with other loose materials, pneumatic conveyance with a vibration impressed on the gas/solid flow is impossible or not advantageous.
However, the aim to be achieved when dealing with such materials is also the most uniform possible conveying action, at a low conveying speed and a high load factor. In this connection, the economy of the conveying operation and the care with which the product is handled increase in proportion to the speed of conveying movement and the load factor approaching the blockage limit. Warning of an impending blockage in the conveyor conduit is given by a local increase in the concentration of loose material, and thus an increased pressure drop in that region of the conveyor conduit.Now, although, in the apparatus according to the invention, as in apparatuses in accordance with the state of the art, the differences in respect of the pressures measured in the conveyor conduit for successive portions thereof are formed and compared to predetermined reference values, on the one hand the respective most favourable reference values can be set, without having to take account of limit values caused by the mechanical design as in the case of apparatuses of the general kind set forth, in accordance with the state of the art, and on the other hand, in accordance with the above-mentioned development, the optimum value in respect of the differential pressure for each conveyor conduit portion can be determined in the course of the conveying operation, by using a recording device or an optimisation programme.
Finally, the apparatus according to the invention can also be further developed in such a way that the amount of gas flowing into the conveying agent secondary conduit can additionally be detected and transmitted in the form of an electrical parameter to the electronic control device, in order to achieve a conveying action which is the most advantageous from the energy point of view, relative to the through-flow of bulk material.
An embodiment of the conveyor apparatus according to the invention is illustrated in the drawing.
A conveyor conduit 1 is charged with bulk or loose material by way of a pressure vessel 2 which is acted upon by conveying agent, by way of a supply conduit 3. The loose or bulk material is pneumatically conveyed to a separator 4. Disposed parallel to the conveyor conduit is a conveying agent secondary conduit 5 which is in communication with a conveying agent reservoir by way of a connection 6. Tap of connecting conduits 7 branch off the secondary conduit 5, with electrically controllable valves V1 to
V4 being arranged in the conduits 7. Downstream of the controllable valves, the conduits 7 lead by way of non-return valves 8 to conveying agent in-feed locations 9, in each of which there is arranged a respective filter (not shown).In this arrangement, as illustrated, a plurality of conveying agent in-feed locations may form a respective group which is supplied with additional conveying agent by way of a common controllable valve. Electrical pressure transmitters S1 to S5 are disposed between the groups of in-feed locations, and upstream of the first and downstream of the last conveying agent in-feed location. Signal lines 10 go from the pressure transmitters to an electronic control means 11 where the pressure signals are evaluated, as input signals.
From the control means, signal lines 12 lead to the electrically controlled valves Vitro V4 which are actuated by the output signals from the control means. For certain conveying functions, it is recommended that a gas flow rate meter 13 should be additionally provided at the beginning of the conveying agent secondary conduit. The flow rate meter 13 also transmits the measurement value electrically to the control means 11, by way of a signal line 14.
Freely selectible parameters or initial parameters can be inputted to the electronic control means 11, as further input signals.
A conveying cycle beings with filling the pressure vessel with loose or bulk material. With the outlet valve (not shown in the drawing) closed, the pressure vessel is then pumped up with compressed gas by way of the supply conduit 3. The actual conveying operation is now begun, by opening the outlet valve, with conveying agent being further supplied through the supply conduit 3 into the pressure vessel and into the beginning of the conveyor conduit.
When using vibratory conveying, the conveying agent is intermittently or pulsatingly introduced into the pressure vessel 2 or into the beginning of the conveyor conduit respectively, by way of the supply conduit 3. The resulting fluctuations in pressure cause the bulk material being conveyed to move with an oscillatory movement, whereby the internal adhesion forces between the particles are overcome and thus there is no blockage in the conveyor conduit, in spite of the conveying agent being highly loaded with bulk material. The vibration which is to be observed in the conveyor conduit would very rapidly disappear, as a result of internal friction along the conveyor path, unless it were re-excited by periodic compressed air pulses into the conveyor conduit.Compressed air pulses are introduced into the conveyor conduit at periodic intervals of time by way of the injection locations 9, when using a vibrating conveying mode, by briefly opening the controllable valves V1 to V4. In this way, the desired vibration in the conveyor conduit is maintained to the end thereof. So that the vibration is re-excited and not cancelled by the compressed air pulses, it is necessary for the compressed air pulses to pass into the conveyor conduit at the various injection locations, at the proper time. Forthis purpose, the electrical pressure transmitters S1 to S5 signal the fluctuations in pressure in the conveyor conduit to the operator or to the electronic control means.The optimum mode of operation can then be achieved by systematic adjustment of the periods for which the controllable valves V1 to V4 are open, and the moment in time at which they are operated. Optimum operation is achieved when the fluctuations in pressure in the conveyor conduit are amplified instead of being weakened as a result of the compressed air pulses. When the optimum mode of actuation of the controllable valves V1 to V4 has been found, that setting of the conveyor apparatus remains unchanged, as long as the same material is being conveyed.
For many products, vibration conveying is not possible or is disadvantageous. Nonetheless, for the purposes of carefuliy treating the product to be conveyed and for the purposes of reducing apparatus wear, the emphasis is laid on conveying the material as slowly as possible. When this is done, there is always the danger of a threat of blockage in the conveyor conduit. Impending blockage at a point in the conveyor conduit causes an increased pressure drop in the conveying agent at that point. The electrical pressure transmitters S1 to S5 signal the pressure at the respective places in the conveyor conduit, to the electronic control means.If the maximum permissible pressure drop which is programmed into the electronic control means for each conveyor conduit section is exceeded in a section of the conveyor conduit between two pressure transmitters, then the controllable valve associated with that conveyor conduit section opens until the pressure drop has fallen again belowthe maximum permissible value, as a result of the conveying agent which is additionally introduced into the abovementioned conveyor conduit section.
The conveying agent flow rate meter 13 signals the level of consumption of additional conveying agent by the conveying agent secondary conduit, and thus makes it possible to arrive at conclusions regarding the power consumption for given conveying conditions.
The electrically controllable valves are actuated by logic combination of the input signals inputted into the electrical or electronic control means, in accordance with optimisation criteria which have been programmed in or which are to be determined by the operator, in accordance with the above-described statements of problem. In order to ascertain the reaction of the conveyor apparatus to manipulative changes at the electronic control means, the input signals, that is to say, the pressures in the conveyor conduit and possibly the consumption of conveying agent in the secondary conduit are registered in accordance with individual inquiry or continuously, on suitable recording equipment such as an oscillograph, a continuous line recording instrument, a point recording instrument or a printing mechanism.
This not only permits adjustment of the optimum condition of conveying for the conveyor apparatus, but also permits continuous monitoring of the conveyor apparatus in operation.
In the event of a change in the bulk material to be conveyed, or the conveyor section to be charged by the bulk material issuer, both the control algorithms and also the freely selectible input parameters can be quickly exchanged by a programme change. This means therefore that one and the same conveyor apparatus can be used for conveying the most widely varying bulk materials, without trouble, in accordance with different optimisation criteria (for example conveying the material at the minimum possible speed or in the best manner from the point of view of energy). Ideal adjustment of the conveyor apparatus can be comfortably effected from a control desk, without making an inspection along the conveyor section, because all information concerning the instantaneous condition of the apparatus is indicated, continuously or in response to inquiry, at the control desk.In this connection, it is also desirable to provide information feedback or receipt lines (not shown) from the valves V1 to V4 to the control unit 11, which lines signal the actual condition of actuation of each individual valve so that said condition of actuation can also be displayed at the control desk, for example by means of signal lamps.
This makes it possible for valves which are defective in operation and any trouble which may be caused thereby to be detected and located with particular rapidity in operation of the apparatus.
In general, valves having only two positions, that is to say an 'open' position and a 'closed' position, are entirely satisfactory as the controllable valves; however, in order further to minimise the consumption of clean air, whiie accepting a correspondingiy.
more expensive control unit, it is also possible to use valves which can either be continuously opened or closed or moved into a defined intermediate or throttle position, by suitable electrical control signals.
The non-return valves and filters contained in the system for providing the additional feed of conveying agent prevent material from passing across into the system for the additional supply of conveying agent, and thus ensure that the apparatus is absolutely reliable in operation.
Claims (10)
1. Apparatus for pneumatically conveying bulk material, incuding a conveying agent secondary conduit disposed parallel to a conveyor conduit and is connected to the conveyor conduit via controllable valves along the conveyor path, and pressure sensors arranged at spacings on the conveyor conduit, for controlling said valves, which pressure sensors are electrical pressure transmitters connected by lines to an electronic control unit which produces a logic connection of the output signals of the pressure transmitters to parameters which are introduced as reference values and which characterise the conveyor condition such as pressures, pressure differences, time intervals and frequencies, the electronic control unit being operable, when the actual conveying condition deviates from the reference conveying condition, electrically to actuate the controllable valves via further lines.
2. Apparatus according to claim 1, in which the electronic control unit is connected to at least one electrical gas flow rate meter.
3. Apparatus according to claim 1 or claim 2, in which the electronic control unit includes a control desk for optically and/or acoustically indicating the position of the electrically controlled valves, jointly or in accordance with individual enquiry.
4. Apparatus according to any one of claims 1 to 3, in which the electronic control unit includes recording devices for continuously recording the actual values obtained in respect of the measure parameters.
5. Apparatus according to any one of claims 1 to 4, in which the electronic control unit includes a plurality of control programmes corresponding to different predetermined conveying conditions.
6. Apparatus according to any one of claims 1 to 5, in which the electronic control unit includes an optimisation programme which automatically corrects the reference values which are predetermined as initial parameters.
7. Apparatus according to any one of claims 1 to 6, including a plurality of conveying agent in-feed locations associated with each electrically controlled valve, on the conveyor conduit.
8. Apparatus according to claim 7, in which each conveying agent in-feed location includes a filter.
9. Apparatus according to claim 7 or claim 8, including a non-return valve arranged upstream of each conveying agent in-feed location, on the clean air side.
10. Apparatus for pneumatically conveying bulk material, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3037517A DE3037517C2 (en) | 1980-10-03 | 1980-10-03 | System for the pneumatic conveying of bulk goods |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2085388A true GB2085388A (en) | 1982-04-28 |
| GB2085388B GB2085388B (en) | 1984-05-10 |
Family
ID=6113585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8127855A Expired GB2085388B (en) | 1980-10-03 | 1981-09-15 | Apparatus for pneumatically conveying bulk material |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS57121530A (en) |
| AU (1) | AU541179B2 (en) |
| BE (1) | BE890603A (en) |
| CA (1) | CA1179398A (en) |
| CH (1) | CH652695A5 (en) |
| DE (1) | DE3037517C2 (en) |
| DK (1) | DK151565C (en) |
| FR (1) | FR2491443B1 (en) |
| GB (1) | GB2085388B (en) |
| IT (1) | IT1138648B (en) |
| LU (1) | LU83659A1 (en) |
| NL (1) | NL8104374A (en) |
| NO (1) | NO813351L (en) |
| SE (1) | SE8105598L (en) |
| ZA (1) | ZA816853B (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0114916A2 (en) * | 1982-12-27 | 1984-08-08 | Kawasaki Steel Corporation | Method of distributing and transporting powdered or granular material |
| US4515503A (en) * | 1981-03-09 | 1985-05-07 | Macawber Engineering Limited | Method and apparatus for unblocking conveying pipes for particulate material |
| US4662798A (en) * | 1982-07-07 | 1987-05-05 | Kloeckner Stahlforschung Gmbh | Method and a device for measuring and/or regulating the mass flow of solid particles |
| US4715748A (en) * | 1984-09-29 | 1987-12-29 | Avt Anlagen- Und Verfahrenstechnik Gmbh | Process and equipment for pneumatic and hydraulic transport of bulk materials through pipes |
| FR2614880A1 (en) * | 1987-05-05 | 1988-11-10 | Waeschle Maschf Gmbh | DEVICE FOR THE PNEUMATIC TRANSPORT OF BULK MATERIALS BY MEANS OF A TRANSPORT DRIVE AND A SIDE DRIVE IN WHICH PASSING THE PURE GAS |
| FR2614881A1 (en) * | 1987-05-05 | 1988-11-10 | Waeschle Maschf Gmbh | DEVICE FOR THE PNEUMATIC TRANSPORT OF BULK MATERIALS |
| EP0517150A1 (en) * | 1991-06-06 | 1992-12-09 | Alb. Klein GmbH & Co. KG | Method and device for controlling the admission of air into the conveying pipe of a pneumatic conveyor |
| US5584612A (en) * | 1994-11-02 | 1996-12-17 | Nol-Tec Systems, Inc. | Apparatus and process for pneumatically conveying material and for controlling the feed of supplemental gas |
| US6106202A (en) * | 1998-05-04 | 2000-08-22 | Nol-Tec Systems, Inc. | Pneumatic conveying air assist line with air bleed |
| GB2375104A (en) * | 2001-05-03 | 2002-11-06 | Rugby Group Ltd The | Material handling apparatus and method |
| WO2003059794A1 (en) * | 2002-01-21 | 2003-07-24 | Bühler AG | System for influencing the rheological properties of a transportable material |
| GB2392895A (en) * | 2002-09-10 | 2004-03-17 | Rotaval Ltd | Pneumatic conveyor control system |
| CN104276408A (en) * | 2013-05-03 | 2015-01-14 | 泽普林系统有限责任公司 | Device and method for operating pneumatic conveying equipment |
| WO2018007787A1 (en) * | 2016-07-04 | 2018-01-11 | Clyde Process Limited | Material conveying apparatus and method |
| WO2020225158A1 (en) | 2019-05-03 | 2020-11-12 | Schenck Process Europe Gmbh | Material conveying apparatus with shut down valves |
| AU2018417114B2 (en) * | 2018-04-16 | 2021-03-11 | Jiangsu normal university | Unblocking system and method of pneumatic conveying pipeline |
| WO2021240554A1 (en) * | 2020-05-25 | 2021-12-02 | Nte Holding S.R.L. | Fluid control system in pneumatic conveying ducts for powdered or granular material |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6118635A (en) * | 1984-06-21 | 1986-01-27 | Matsui Seisakusho:Kk | Pneumatic conveyance of powder material free from clogging and apparatus thereof |
| JPS61140415A (en) * | 1984-12-14 | 1986-06-27 | Nippon Spindle Mfg Co Ltd | Powder transport method |
| JPH0741991B2 (en) * | 1991-08-27 | 1995-05-10 | 株式会社日本アルミ | Pneumatic transportation method of powder and granular material and pneumatic transportation device of powder and granular material |
| DE4328626A1 (en) * | 1993-08-27 | 1995-03-02 | Motan Verfahrenstechnik | Method for operating a conveyor pipeline with dense-stream conveyance and apparatus for carrying out the method |
| DE4424897A1 (en) | 1994-07-15 | 1996-01-18 | Motan Verfahrenstechnik | Method and device for the pneumatic conveying of bulk material |
| DE19542787A1 (en) * | 1995-11-16 | 1997-05-22 | Wacker Chemie Gmbh | Self-regulating fluidised transport system |
| DE102004047457B8 (en) * | 2004-09-30 | 2009-11-26 | Coperion Gmbh | Method for operating a conveyor system for flowable bulk materials, conveyor system for carrying out the method and multiple-function valve for this purpose |
| CN110550457A (en) * | 2019-09-09 | 2019-12-10 | 浙江乔治白服饰股份有限公司 | Waste material collecting device and waste material collecting method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1405207A (en) * | 1961-07-22 | 1965-07-09 | Poirier Pauze & Cie Ets | Method for transporting powdery, pasty or similar products and device for applying said method |
| JPS5593734A (en) * | 1978-12-29 | 1980-07-16 | Gen Resource Corp | Method and device for carrying corpuscular substance through pipeeline |
-
1980
- 1980-10-03 DE DE3037517A patent/DE3037517C2/en not_active Expired
-
1981
- 1981-09-15 GB GB8127855A patent/GB2085388B/en not_active Expired
- 1981-09-16 FR FR8117461A patent/FR2491443B1/en not_active Expired
- 1981-09-18 CH CH6052/81A patent/CH652695A5/en not_active IP Right Cessation
- 1981-09-22 SE SE8105598A patent/SE8105598L/en not_active Application Discontinuation
- 1981-09-23 NL NL8104374A patent/NL8104374A/en not_active Application Discontinuation
- 1981-09-23 AU AU75585/81A patent/AU541179B2/en not_active Ceased
- 1981-09-28 IT IT24178/81A patent/IT1138648B/en active
- 1981-09-30 DK DK433281A patent/DK151565C/en not_active IP Right Cessation
- 1981-10-01 LU LU83659A patent/LU83659A1/en unknown
- 1981-10-02 ZA ZA816853A patent/ZA816853B/en unknown
- 1981-10-02 CA CA000387147A patent/CA1179398A/en not_active Expired
- 1981-10-02 BE BE0/206148A patent/BE890603A/en not_active IP Right Cessation
- 1981-10-02 JP JP56156305A patent/JPS57121530A/en active Pending
- 1981-10-02 NO NO813351A patent/NO813351L/en unknown
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4515503A (en) * | 1981-03-09 | 1985-05-07 | Macawber Engineering Limited | Method and apparatus for unblocking conveying pipes for particulate material |
| US4662798A (en) * | 1982-07-07 | 1987-05-05 | Kloeckner Stahlforschung Gmbh | Method and a device for measuring and/or regulating the mass flow of solid particles |
| EP0114916A2 (en) * | 1982-12-27 | 1984-08-08 | Kawasaki Steel Corporation | Method of distributing and transporting powdered or granular material |
| EP0114916A3 (en) * | 1982-12-27 | 1986-02-19 | Kawasaki Steel Corporation | Method of distributing and transporting powdered or granular material |
| US4715748A (en) * | 1984-09-29 | 1987-12-29 | Avt Anlagen- Und Verfahrenstechnik Gmbh | Process and equipment for pneumatic and hydraulic transport of bulk materials through pipes |
| FR2614881A1 (en) * | 1987-05-05 | 1988-11-10 | Waeschle Maschf Gmbh | DEVICE FOR THE PNEUMATIC TRANSPORT OF BULK MATERIALS |
| FR2614880A1 (en) * | 1987-05-05 | 1988-11-10 | Waeschle Maschf Gmbh | DEVICE FOR THE PNEUMATIC TRANSPORT OF BULK MATERIALS BY MEANS OF A TRANSPORT DRIVE AND A SIDE DRIVE IN WHICH PASSING THE PURE GAS |
| US4861200A (en) * | 1987-05-05 | 1989-08-29 | Waeschle Maschinenfabrik Gmbh | Apparatus for pneumatically conveying bulk material |
| BE1001498A5 (en) * | 1987-05-05 | 1989-11-14 | Waeschle Maschf Gmbh | DEVICE FOR THE PNEUMATIC TRANSPORT OF BULK MATERIALS USING A CONVEYANCE PIPE AND A SIDE PIPE IN WHICH PUR GAS PASSES. |
| US4909676A (en) * | 1987-05-05 | 1990-03-20 | Waeschle Maschinenfabrik Gmbh | Apparatus for pneumatically conveying bulk material |
| BE1002183A3 (en) * | 1987-05-05 | 1990-10-02 | Waeschle Maschf Gmbh | DEVICE FOR THE PNEUMATIC TRANSPORT OF BULK MATERIALS. |
| EP0517150A1 (en) * | 1991-06-06 | 1992-12-09 | Alb. Klein GmbH & Co. KG | Method and device for controlling the admission of air into the conveying pipe of a pneumatic conveyor |
| US5584612A (en) * | 1994-11-02 | 1996-12-17 | Nol-Tec Systems, Inc. | Apparatus and process for pneumatically conveying material and for controlling the feed of supplemental gas |
| US6106202A (en) * | 1998-05-04 | 2000-08-22 | Nol-Tec Systems, Inc. | Pneumatic conveying air assist line with air bleed |
| GB2375104A (en) * | 2001-05-03 | 2002-11-06 | Rugby Group Ltd The | Material handling apparatus and method |
| GB2375104B (en) * | 2001-05-03 | 2003-11-19 | Rugby Group Ltd The | Material handling apparatus and method |
| WO2003059794A1 (en) * | 2002-01-21 | 2003-07-24 | Bühler AG | System for influencing the rheological properties of a transportable material |
| US7044435B2 (en) | 2002-01-21 | 2006-05-16 | Buehler Ag | System for influencing the rheological properties of a transportable material |
| GB2392895A (en) * | 2002-09-10 | 2004-03-17 | Rotaval Ltd | Pneumatic conveyor control system |
| GB2392895B (en) * | 2002-09-10 | 2006-07-19 | Rotaval Ltd | Control system for pneumatic conveyor control device and method therefor |
| CN104276408B (en) * | 2013-05-03 | 2017-05-17 | 泽普林系统有限责任公司 | Device and method for operating pneumatic conveying equipment |
| CN104276408A (en) * | 2013-05-03 | 2015-01-14 | 泽普林系统有限责任公司 | Device and method for operating pneumatic conveying equipment |
| WO2018007787A1 (en) * | 2016-07-04 | 2018-01-11 | Clyde Process Limited | Material conveying apparatus and method |
| US10696496B2 (en) | 2016-07-04 | 2020-06-30 | Schenck Process UK Limited | Material conveying apparatus and method |
| AU2018417114B2 (en) * | 2018-04-16 | 2021-03-11 | Jiangsu normal university | Unblocking system and method of pneumatic conveying pipeline |
| WO2020225158A1 (en) | 2019-05-03 | 2020-11-12 | Schenck Process Europe Gmbh | Material conveying apparatus with shut down valves |
| US11760583B2 (en) | 2019-05-03 | 2023-09-19 | Schenck Process Europe Gmbh | Material conveying apparatus with shut down valves |
| WO2021240554A1 (en) * | 2020-05-25 | 2021-12-02 | Nte Holding S.R.L. | Fluid control system in pneumatic conveying ducts for powdered or granular material |
| US11891255B2 (en) | 2020-05-25 | 2024-02-06 | Nte Holding S.R.L. | Fluid control system in pneumatic conveying ducts for powdered or granular material |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA816853B (en) | 1982-09-29 |
| DE3037517A1 (en) | 1982-04-22 |
| FR2491443A1 (en) | 1982-04-09 |
| NO813351L (en) | 1982-04-05 |
| DK433281A (en) | 1982-04-04 |
| AU7558581A (en) | 1982-04-08 |
| BE890603A (en) | 1982-02-01 |
| DK151565C (en) | 1988-05-24 |
| IT8124178A0 (en) | 1981-09-28 |
| JPS57121530A (en) | 1982-07-29 |
| DK151565B (en) | 1987-12-14 |
| CA1179398A (en) | 1984-12-11 |
| NL8104374A (en) | 1982-05-03 |
| GB2085388B (en) | 1984-05-10 |
| DE3037517C2 (en) | 1983-12-08 |
| CH652695A5 (en) | 1985-11-29 |
| FR2491443B1 (en) | 1988-04-22 |
| SE8105598L (en) | 1982-04-04 |
| AU541179B2 (en) | 1984-12-20 |
| IT1138648B (en) | 1986-09-17 |
| LU83659A1 (en) | 1982-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920915 |