EP0315750A1 - Pump for viscous material - Google Patents

Pump for viscous material Download PDF

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Publication number
EP0315750A1
EP0315750A1 EP88114734A EP88114734A EP0315750A1 EP 0315750 A1 EP0315750 A1 EP 0315750A1 EP 88114734 A EP88114734 A EP 88114734A EP 88114734 A EP88114734 A EP 88114734A EP 0315750 A1 EP0315750 A1 EP 0315750A1
Authority
EP
European Patent Office
Prior art keywords
shut
opening
housing
thick matter
pump
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
Application number
EP88114734A
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German (de)
French (fr)
Other versions
EP0315750B1 (en
Inventor
Hartmut Dr.-Ing. Benckert
Hellmut Hurr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Putzmeister Werk Maschinenfabrik GmbH
Original Assignee
Putzmeister Werk Maschinenfabrik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19873738359 priority Critical patent/DE3738359A1/en
Priority to DE3738359 priority
Application filed by Putzmeister Werk Maschinenfabrik GmbH filed Critical Putzmeister Werk Maschinenfabrik GmbH
Publication of EP0315750A1 publication Critical patent/EP0315750A1/en
Application granted granted Critical
Publication of EP0315750B1 publication Critical patent/EP0315750B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B15/023Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F04B7/0034Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an orbital movement, e.g. elbow-pipe type members

Abstract

The pump for viscous material comprises two alternately working displacement cylinders 22', 22'' opening out via end face apertures into a material feeding vessel 10, a pipe switch gate 12, which is arranged inside the material feeding vessel 10, being alternately connectable on the inlet side to the apertures of the displacement cylinder and freeing the respective other aperture, and on the outlet side connected to a delivery line 40, together with a shut-off device 32 arranged behind the pipe switch gate 12 in the direction of conveying. The shut-off device 32 is arranged in a housing 34 which is connected to the material feeding vessel 10 for the purpose of recycling material via a through-aperture 60 in the partition wall 16. The shut-off device 32 is formed by a pipe section 42 arranged inside the housing 34, connectable to the wall through-holes 30, 36 and displacable or swivellable in relation to at least one of the wall through-holes 30. <IMAGE>

Description

  • The invention relates to a thick matter pump with at least two alternately operating delivery cylinders opening into front end openings in a material feed container, with a delivery cylinder arranged within the material feed container, alternately connectable on the inlet side to the openings of the feed cylinder and opening the other opening and connecting the outlet side to a delivery line , and with a shut-off device arranged behind the pipe switch in the conveying direction.
  • Pumps of this type serve to convey concrete and other pulpy masses, such as, for example, overburden with water in tunnel constructions or coal dust with water or heating oil in coal-fired systems. The shut-off device in the pressure pipe enables working against high pressure without the risk of material backflow during the switching of the pipe switch as well as performing a compression stroke before the actual delivery stroke. The S-shaped swivel tube comes into consideration as the pipe switch. Basically, however, the use of U-shaped swivel tubes (trunk turnouts), rock turnouts and downpipes is within the scope of the invention.
  • It is also known per se to provide shut-off elements in the region of the delivery line, which can be designed, for example, as a seat valve, flat slide valve, flapper valve or check valve. The first three Shut-off devices are positively controlled, while the check valve responds passively to the pressure in the delivery line when the pressure in the pipe switch drops. All these known shut-off devices have in common that they are arranged outside the material feed container. In the event of wear, these shut-off elements cause a leakage of the conveyed material, which leads to contamination of the surroundings of the shut-off element and the pump.
  • The invention has for its object to develop a slurry pump with shut-off device, which ensures a reliable shut-off of the flow without the risk of pollution of the environment.
  • To achieve this object, the combination of features specified in claim 1 is proposed. Further advantageous refinements and developments of the invention result from the subclaims.
  • The invention is based on the knowledge that the occurrence of leaks cannot be avoided on shut-off elements for conveyed goods made of abrasive thick matter with solid and liquid components, even with a large encapsulation effort, because of the inevitable signs of wear. Accordingly, it is proposed according to the invention to arrange the shut-off device in a housing which is connected or can be connected to the material feed container for the purpose of returning the material.
  • According to a preferred embodiment of the invention, the housing is separated from the material feed container by a partition having a passage opening in its lower region and has an incline to the through opening on the bottom of the housing. In principle, it is also possible to arrange a positive conveyor, preferably a screw conveyor, between the housing and the material feed container for the material return.
  • In order to be able to retrofit already existing thick matter pumps with a shut-off device according to the invention, the housing designed as a retrofit unit has a connection stub that can be connected to the outlet side stub of the pipe switch on the inlet side of the shut-off member and a material return stub that can preferably be connected to the bottom region of the material feed container via a connection duct. Due to the leakage, only fine parts emerge from the shut-off device into the housing, while there are also large parts in the material feed container. In order to prevent coarse parts from getting into the housing, it has proven expedient to automatically block the flow of material from the material feed container towards the housing, for example by means of a non-return valve.
  • According to a preferred embodiment of the invention, the pipe switch, which is preferably in the form of an S-shaped swivel tube, is pivotally mounted on the outlet side in the area of a wall duct on the partition, while the feed line is connected to a further wall duct located in an outer wall opposite the partition. According to the invention, a tube piece forming the shut-off element, connectable to the two wall bushings and displaceable or pivotable with respect to at least one of the wall bushings, is also arranged in the housing.
  • The pipe section can be designed as a preferably S-shaped swivel pipe, the outlet-side end of which is pivotally mounted in the region of the wall duct of the outer wall and the inlet-side end of which has a closure plate which is arranged next to its inlet opening and which alternates with the inlet opening when the swivel pipe is pivoted back and forth the outlet opening of the pipe switch in the area of the wall duct reaches the partition. The S-shaped pipe section can additionally be mounted with a shaft aligned axially to its outlet end in a swivel bearing arranged on the partition. Advantageously, the pipe section can be pivoted by means of a hydraulically actuated drive mechanism that engages at its outlet-side end, preferably arranged on the outside of the housing.
  • According to a further preferred embodiment of the invention, the pipe piece is formed by an opening in a pivoting slide which is arranged in the housing so as to be pivotable about an axis parallel to the passage axes of the wall bushings, such that when pivoting back and forth the opening and a closure part of the pivoting slide alternately in front the openings on the housing side of the wall bushings. The wall bushings arranged in the partition and the outer wall of the housing are expediently axially aligned with one another.
  • Advantageously, on at least one of the two broad side surfaces of the swivel body, a wear plate provided with a passage opening and a closure surface is detachably arranged, which with its free The outer surface rests against a wear ring arranged interchangeably in the area of the adjacent wall bushing. In a kinematic reversal of this arrangement, a wear plate provided with a passage opening and a closure surface can also be detachably arranged on at least one inside wall surface in the area of the wall bushing, against the free outer surface of which there is a wear ring which is exchangeably arranged in the area of the inlet and outlet opening of the pivoting slide opening. In order to ensure an automatic sealing of the wear parts abutting against each other during each pressure stroke, the wear ring lies against an annular shoulder that limits the opening or the wall lead-through with an elastically flexible sealing ring with a larger inner diameter. Since the wear ring protrudes beyond the wall surface in question, an undesirable material leakage can occur when the swivel plate is switched between its two end positions via the gap next to the wear ring. In order to avoid this, a locking plate opposite the wear plate, at least in the pivoting area of the opening, can preferably be detachably arranged laterally next to the wear ring protruding beyond the wall surface in question, the wall thickness of which, if appropriate with a small undersize, essentially corresponds to the protruding height of the wear ring. The wear plate and / or the locking plate expediently have a kidney-shaped outline.
  • The pivoting slide is advantageously connected in a rotationally fixed manner to a drive shaft forming the pivot axis, which in turn is preferably connected to the drive shaft Is arranged outside the housing, hydraulically actuated drive mechanism is pivotable.
  • The reversing of the shut-off element from the closed position into the open position can be carried out in accordance with an adjustable pre-compression pressure in the pipe switch, in particular in accordance with a differential pressure between the delivery line and the pipe switch. The shut-off device is expediently reversed in the pipe switch when a pre-compression pressure corresponding to the pressure in the delivery line is reached. Technically, this can be achieved in a particularly simple manner in that the shut-off element can be displaced to a limited extent in the direction of its pivot axis in the closed position under the action of the differential pressure between the pipe switch and the delivery line, and in that a sensor which responds to the displacement position is provided for reversing the shut-off element.
  • When materials are conveyed with two-cylinder pumps, the problem arises that there is a delivery gap between the two delivery strokes. This leads to blows and discontinuities in the material flow. Even with an optimal design, the funding gap is around 2 to 10% of the period of use. In connection with the shut-off device according to the invention, the delivery gap can be filled in that an auxiliary cylinder with its pressure connection directly into the delivery line is arranged behind the shut-off device in the conveying direction, the volume of which is a fraction of the volume of the two delivery cylinders and that during the locked state of the Shut-off device for executing a conveying stroke is controllable and can be acted upon by the conveyed material from the conveying line following the conveying stroke by executing an aspirating stroke. The auxiliary cylinder expediently opens at an angle into the conveying line with a component in the conveying direction. The delivery stroke of the auxiliary cylinder is preferably dimensioned such that the delivery gap occurring between the delivery strokes of the two delivery cylinders during the shut-off time is compensated for according to the delivery quantity and time. The delivery stroke of the auxiliary cylinder is expediently triggered before the shut-off element is completely blocked, while the suction stroke of the auxiliary cylinder can be triggered after the shut-off element has been opened, preferably after it has been completely emptied. This avoids fluctuations in the delivery rate and the formation of a gradually hardening plug in the auxiliary cylinder. The suction stroke can either be controlled externally or under the influence of the pressure prevailing in the delivery line.
  • The invention is explained in more detail below on the basis of the exemplary embodiments shown schematically in the drawing. Show it
    • 1 shows a pipe switch with an S-shaped swivel pipe shut-off device in a vertical section;
    • FIG. 1a shows a detail from FIG. 1 with a modified swivel tube drive;
    • Fig. 2 is a plan view of the pipe switch according to Fig. 1;
    • 3 shows a further exemplary embodiment of a pipe switch with a shut-off element designed as a pivoting slide in a vertical section;
    • 4 shows a section along the section line 4-4 of FIG. 3;
    • Figure 5 is a plan view of a two-cylinder slurry pump with shut-off device and downstream auxiliary cylinder.
    • Fig. 6 is a diagram showing the mass flow ṁ in the delivery line of the thick matter pump shown in Fig. 5 as a function of time t.
  • In the essentially funnel-shaped material feed container 10 there is a pipe switch 12 designed as an S-shaped curved swivel tube, which is pivotably mounted about a horizontal axis 18 extending between the outer wall 14 and the partition wall 16. In the outer wall 14 there are openings 20 ', 20' behind which delivery cylinders 22 ', 22' are flanged, which can be controlled in opposite directions in the delivery direction or suction direction via hydraulic cylinders 24, 24 '(Fig. 5). The swivel tube 12 is pivoted with its inlet opening 26 alternately in the pump cycle in front of the opening 20 ', 20' of the delivery cylinder performing the delivery stroke, while the opening of the delivery cylinder performing the intake stroke is free to take up material from the material feed container. At its outlet end 28 the swivel tube 12 is connected to a delivery line 40 via a wall duct 30 in the partition 16, a shut-off element 32 arranged in the housing 34 and a wall duct 36 in the outer wall 38 of the housing 34.
  • In the case of the embodiment shown in FIGS. 1 and 2, the shut-off element 32 is designed as an S-shaped pivoted swivel tube 42, which extends around a horizontal axis 44 extending between the partition 16 and the outer wall 38 by means of a hydraulically actuated swivel mechanism 46 ', 46˝ is pivotable back and forth. In the case of the exemplary embodiment shown in FIG. 1, the swivel mechanism 46 'is arranged in a protective box 48 within the material feed container, while in the case of the exemplary embodiment according to FIG. 1a, a swivel mechanism 46' arranged outside the material feed container 10 and the housing 34 is provided. The housing 34 is accessible from above via a removable cover 50 for maintenance and repair purposes. As can be seen in particular from FIG. 2, the swivel tube 42 has on its side facing the partition 16 a laterally projecting closure plate 52 which is braced by a rod 54 with the swivel tube. In the locked position of the swivel tube 52, the closure plate 52 reaches the housing side in front of the opening 30 'in the partition 16 and thereby closes the pressure outlet of the pipe switch 12. This, on the one hand, prevents backflow of conveyed material from the conveying line 40. On the other hand, the pressurized feed cylinder can carry out a compression stroke which leads to a pre-compression before the shut-off device 32 is switched through to the feed line 40.
  • The swivel tube 42 is sealed off from the swivel tube 12 in the area of the wall duct 30 via automatically sealing wear parts 56, 58, the position of the automatically sealing ring 56 with respect to the stationary wear part 58 also being able to be exchanged.
  • Since leakage in the area of the wear parts 56, 58 of the swivel tube 42 moving against one another cannot be avoided, the housing 34 is connected to the material feed container 10 via an inclined bottom 62 and a passage opening 60 in the partition wall 16 for the purpose of material return. The returned material is then pumped into the delivery line 40 together with the material filled in via the feed shaft 64. On the other hand, to prevent a material flow from the material feed container 10 into the housing 34, a non-return valve 61 is arranged in the area of the passage opening 60.
  • The exemplary embodiment shown in FIGS. 3 and 4 differs from the exemplary embodiment according to FIGS. 1 and 2 in the more compact design of the shut-off element 32. Instead of the S-tube 42, a pivoting slide 66 is provided there, which is arranged between the partition wall 16 and the outer wall 38 extending horizontal axis 44 'can be pivoted back and forth between two end positions by a hydraulically actuated pivot mechanism 46' arranged outside the housing 34. The Shwenkschieber 66 has by means of a clamping device 68 on the axle shaft 44 'non-rotatably, a circular opening 69 and a closure surface 71 having pivot body 70, on the broad sides of which a kidney-shaped wear plate 72 with passage opening 74 is interchangeably arranged. The plates 72 can against each other in the event of wear be replaced. The swivel body 70 is arranged between two automatically sealing under the action of the delivery pressure wear rings 76, which are supported by elastic sealing rings 78 against the wall bushings 30 and 36 in the region of the openings 30 'and 36'. The automatic sealing function is achieved by the larger inner diameter of the sealing rings 78 compared to the wear rings 76. Since the wear rings 76 protrude somewhat beyond the partition 16 or the outer wall 38 towards the interior of the housing, a gap is formed between the relevant housing wall parts and the wear plates 72, through which material can get into the housing 34 from the tube interior during the switching process. In order to avoid this, a blocking plate 80, which bridges this gap, is arranged on the inside of the relevant housing walls and fulfills a sealing function during the switching process. This locking plate 80 is also expediently exchangeable because of the wear that occurs there.
  • In the embodiment shown in Figure 3, the shaft 44 'is limited axially displaceable together with the pivoting slide 66. Accordingly, a certain axial play must be provided in the area of the locking plates 80 and the sealing rings 78. Furthermore, a sensor responsive to the axial displacement position is provided on the outside of the housing. With this arrangement, it is possible that the pivoting slide 66 in its closed position under the action of the differential pressure prevailing between the pipe switch 12 and the delivery line 40 can be displaced to a limited extent in the direction of its pivot axis, and that the sensor 88, which responds to the displaced position, detects the shut-off device from the closed position reversed into the open position when the pre-compression pressure in the pipe switch 12 corresponds to the counter pressure in the delivery line 40.
  • The inclined housing base 62 in turn leads to a passage opening 60 in the partition 16 through which leakage material can be returned to the material feed container and can be conveyed away from there via the pump.
  • The control of the two-cylinder thick matter pumps according to FIGS. 1 to 4 is as follows:
  • In the course of a delivery stroke of one or the other delivery cylinder 22 ', 22˝, the diverter 12 and the shut-off device 32 are switched to free passage. At the end of the delivery stroke, the shut-off element 32 is controlled in the closed position by an electrically or hydraulically emitted signal, while the diverter 12 is switched to the other delivery cylinder when the shut-off element 32 is closed. This ensures that no material to be conveyed can flow back from the conveying line 40 into the material feed container 10 during the switching of the pipe switch 12. At the end of the switching process of the diverter 12, the shut-off device 32 is controlled again in its open position. The new delivery stroke is triggered either before or after the shutoff member 32 is opened. In order to achieve a pre-compression, the new delivery stroke must first be driven against the closed shut-off device 32. Only when a given pressure, e.g. the pressure in the delivery line 40 is reached, the shut-off device 32 is opened. This prevents backflow. In the shut-off mechanisms described, it is ensured that the material plug remaining in the tubular shut-off elements 42 and 66 during the switching process is completely carried along with the next conveying stroke.
  • In the exemplary embodiment shown in FIG. 5, a two-cylinder pump opens into the delivery line 40 behind the pressure port of the material feed container 10 equipped with a shut-off element 32, the pressure port of an auxiliary cylinder 84 with a relatively small delivery volume. The delivery volume is designed so that it can completely fill the delivery gap when switching between the two delivery cylinders 22 ', 22 ′. The control of the auxiliary cylinder 84 is carried out by the central control for the feed cylinder 22 ', 22˝. To fill the auxiliary cylinder 84, one of the delivery cylinders 22 ', 22' material can be branched off from the delivery line 40 during the delivery stroke. The piston 86 of the auxiliary cylinder 84 is either pushed back directly via the material pressure in the delivery line 40 or positively controlled. By appropriate throttling, the filling process can be extended over a longer period up to the entire duration of the delivery stroke, so that the disturbance caused thereby is negligible. The start of the delivery stroke of the auxiliary cylinder 84 can be selected so that the interruption in the flow of flow is compensated for. Because of the inertia of the system, this means that the delivery stroke starts already during the closing of the shut-off element 32. In addition, in order to avoid material hardening in the auxiliary cylinder, care must be taken to ensure that all of the material is expelled from the auxiliary cylinder. 6 shows the mass flow ṁ in the delivery line 40 behind the auxiliary cylinder 84 as a function of the time t. The mass flows generated by the two feed cylinders 22 ', 22' result from the curve sections 1 and 2. When switching between the feed cylinders, a delivery gap occurs which is filled by the mass delivery from the auxiliary cylinder 84, as indicated by the curve part 3. In the course of curve 4, a partial flow from the mass flow for filling the auxiliary cylinder branched off. The discontinuities in the material flow resulting from the delivery gap can be completely compensated for by appropriate design and control of the auxiliary cylinder.

Claims (27)

1. thick matter pump with at least two alternately operating delivery cylinders opening into a material feed container via end openings, with an arranged inside the material feed container, alternately connectable on the inlet side to the openings of the feed cylinder and opening the other opening and connecting the outlet side to a feed line, and with a shut-off device arranged behind the pipe switch in the conveying direction, characterized in that the shut-off device (32) is arranged in a housing (34) which can be connected to the material feed container (10) for the purpose of material return.
2. thick matter pump according to claim 1, characterized in that the housing (34) is separated by a through opening (60) in its lower region having a partition (16) from the material feed container and an obliquely to the through opening (60) facing down housing bottom (62).
3. thick matter pump according to claim 1 or 2, characterized in that between the housing (34) and the material feed container (10), a positive conveyor, preferably a screw conveyor, is arranged for the material return.
4. thick matter pump according to one of claims 1 to 3, characterized in that the housing (34) for the purpose of retrofitting one on the inlet side of the shut-off organs (32) arranged, which can be connected to the outlet-side connecting piece of the pipe switch (12) and has a material return connecting piece, which can preferably be connected via a connecting channel to the bottom region of the material feed container (10).
5. thick matter pump according to one of claims 1 to 4, characterized in that the material flow from the material feed container (10) in the direction of the housing (34) preferably by means of a check valve can be automatically blocked.
6. thick matter pump according to one of claims 1 to 5, characterized in that the pipe switch (12) is pivotally mounted on the outlet side in the region of a wall bushing (30) on the partition (16) that the delivery line (40) on one in a the additional wall duct (36) located opposite the partition wall (16) is connected, and in that in the housing (34) a shutoff element (32) forming, connectable to the wall duct (30, 36) and opposite at least one of the wall ducts (30, 36) displaceable or pivotable pipe section (swivel pipe 42; swivel body 70) is arranged.
7. thick matter pump according to claim 6, characterized in that the tube piece is designed as a preferably S-shaped pivot tube (42), the outlet-side end in the region of the wall bushing (36) of the outer wall (38) is pivotally mounted and the inlet-side end one has a closing plate (52) arranged laterally next to its inlet opening, which, when the pivoting tube (42) is pivoted back and forth, passes alternately with the inlet opening in front of the outlet opening (28) of the pipe switch (12).
8. thick matter pump according to claim 7, characterized in that the substantially S-shaped curved swivel tube (42) is additionally mounted with an axially aligned to its outlet end shaft (44) in a on the partition (16) arranged pivot bearing.
9. Pump for viscous material according to claim 7 or 8, characterized in that the pivoting tube (42) acting by means of an outlet side, at its end, preferably arranged on the outside of the housing, hydraulically operable pivoting mechanism (46˝) is pivotable.
10. thick matter pump according to claim 6, characterized in that the pipe section is formed by an opening (69) provided with a pivot slide (66), the pivot body (70) about an axis parallel to the passage axes of the wall bushings (30, 36) is pivotally arranged in the housing so that the opening (69) and a closure part (71) of the pivoting slide (66) alternately pass in front of the openings on the housing side (30 ', 36') of the wall bushings (30, 36) when pivoting back and forth.
11. thick matter pump according to claim 10, characterized in that in the partition (16) and in the outer wall (38) of the housing (34) arranged wall bushings (30,36) are axially aligned with each other.
12. thick matter pump according to claim 10 or 11, characterized in that on at least one of the two broad side surfaces of the swivel body (70) one with a Passage opening (74) and a closure surface (71) provided wear plate (72) is detachably arranged, which rests with its free outer surface against a wear ring (76) arranged interchangeably in the area of the adjacent wall duct (30, 36).
13. thick matter pump according to claim 10 or 11, characterized in that on at least one housing-side wall surface in the region of the wall bushing (30, 36) a wear plate provided with an opening and a closure surface is detachably arranged, against the free outer surface of which in the region of The entry or exit opening of the swivel body opening (69) is arranged in an exchangeable wear ring.
14. Pump for viscous material according to claim 12 or 13, characterized in that the wear ring (76) with the interposition of clamping a resilient sealing ring (78) with larger inner diameter against the wall openings (30 ', 36') or the breakthrough (69) limiting ring shoulder.
15. slurry pump according to one of claims 12 to 14, characterized in that laterally next to the wear ring (76) one of the wear plate (72) at least in the pivoting area of the opening (69) opposite locking plate (80) is preferably detachably arranged, the wall thickness with something Undersize essentially corresponds to the protruding height of the wear ring (76).
16. thick matter pump according to one of claims 10 to 15, characterized in that the wear plate (72) and / or the locking plate (80) have a kidney-shaped outline.
17. thick matter pump according to one of claims 10 to 16, characterized in that the swivel body (70) with a pivot axis (44 ') forming the drive shaft is rotatably connected, which is preferably mounted on the outside of the housing, hydraulically actuated drive mechanism (46 ˝) is pivotable.
18. slurry pump according to one of claims 1 to 17, characterized in that the shut-off device can be reversed from its closed position into its open position in accordance with an adjustable precompression pressure in the pipe switch.
19. Thick matter pump according to one of claims 1 to 18, characterized in that the shut-off element can be reversed from its closed position into its open position in accordance with an adjustable differential pressure between the delivery line (40) and the pipe switch (12).
20. Thick matter pump according to one of claims 1 to 19, characterized in that the shut-off element can be reversed from the closed position into the open position when a pre-compression pressure in the pipe switch (12) corresponding to the pressure in the delivery line (40) is reached.
21. slurry pump according to one of claims 1 to 20, characterized in that the shut-off element in its closed position under the action of the prevailing between the pipe switch (12) and the delivery line (40) differential pressure in the direction of its pivot axis is limited, and that a the shifting position responsive sensor (88) is provided for reversing the shut-off element from the closed position into the open position.
22. slurry pump according to one of claims 1 to 21, characterized in that in the conveying direction behind the shut-off device (32) with its pressure port directly into the delivery line (40) opening auxiliary cylinder (84) is arranged, the stroke volume is a fraction of the stroke volume of the two delivery cylinders (22 ', 22˝) and which can be controlled to carry out a delivery stroke during the locked state of the shut-off element (32) and can be acted upon by the delivery stroke from the delivery line (40) with the execution of an intake stroke.
23. thick matter pump according to claim 22, characterized in that the auxiliary cylinder (84) opens obliquely with a component in the conveying direction into the conveying line (40).
24. Pump for viscous material according to claim 22 or 23, characterized in that the delivery stroke of the auxiliary cylinder (84) is dimensioned such that the ( ', 22 22˝) conveying gap between conveyor strokes of the two feed cylinders occurs during the shut-off time after delivery and - time can be compensated.
25. thick matter pump according to one of claims 22 to 24, characterized in that the delivery stroke of the auxiliary cylinder (84) before the complete blocking of the shut-off member (32) can be triggered.
26. Thick matter pump according to one of claims 22 to 25, characterized in that the suction stroke of the auxiliary cylinder (84) after the opening of the shut-off member (34), preferably after its complete emptying can be triggered.
27. thick matter pump according to one of claims 22 to 26, characterized in that the suction stroke of the auxiliary cylinder (84) can be carried out automatically under the action of the pressure prevailing in the delivery line.
EP88114734A 1987-11-12 1988-09-09 Pump for viscous material Expired - Lifetime EP0315750B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19873738359 DE3738359A1 (en) 1987-11-12 1987-11-12 Fuel pump
DE3738359 1987-11-12

Publications (2)

Publication Number Publication Date
EP0315750A1 true EP0315750A1 (en) 1989-05-17
EP0315750B1 EP0315750B1 (en) 1991-07-10

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EP88114734A Expired - Lifetime EP0315750B1 (en) 1987-11-12 1988-09-09 Pump for viscous material

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EP (1) EP0315750B1 (en)
DE (1) DE3738359A1 (en)
ES (1) ES2024604B3 (en)

Cited By (3)

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EP0561262A1 (en) * 1992-03-19 1993-09-22 Schwing GmbH Pump for viscous materials having cylinders, in particular two cylinder concrete pump
WO2001040649A1 (en) * 1999-11-29 2001-06-07 Hudelmaier, Jörg Thick matter pump
WO2007147586A1 (en) * 2006-06-20 2007-12-27 Schwing Gmbh Two-cylinder slurry pump comprising two distribution tubes

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JPH0120756B2 (en) * 1979-04-19 1989-04-18 Yamaha Corp
US5422323A (en) * 1994-04-15 1995-06-06 Magneco/Metrel, Inc. Nonhazardous pumpable refractory insulating composition
DE102005008938B4 (en) * 2005-02-26 2007-01-25 Schwing, Friedrich, Dipl.-Ing. Pumping device and method for the continuous delivery pulpy masses
DE102010046649A1 (en) 2010-09-27 2012-03-29 Schwing Gmbh Slurry pump, particularly concrete pump has pumping device for continuous feeding of slurry, particularly concrete, where piston-cylinder unit is concentrically arranged around conveying line section of conveying line
DE102018132270A1 (en) * 2018-12-14 2020-06-18 Schwing Gmbh Piston pump and method for operating a piston pump
DE102018132309A1 (en) * 2018-12-14 2020-06-18 Schwing Gmbh Piston pump and method for operating a piston pump

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US2448104A (en) * 1945-12-06 1948-08-31 Chain Belt Co Differential concrete pump
DE2729159A1 (en) * 1977-06-28 1979-01-11 Rotacrete Ltd Reciprocating pump for concrete - has two cylinders performing alternate suction and delivery strokes and curved pipe from hopper
EP0016410A1 (en) * 1979-03-14 1980-10-01 Friedrich Wilh. Schwing GmbH Pump for viscous substances, in particular concrete pump
EP0197402A2 (en) * 1985-04-11 1986-10-15 PREUSSAG Aktiengesellschaft Metall Device for transporting thick matter suspensions and method for its operation

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US3663129A (en) * 1970-09-18 1972-05-16 Leon A Antosh Concrete pump
US3963385A (en) * 1975-05-05 1976-06-15 Caban Angel M Valve assembly for concrete pumps

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Publication number Priority date Publication date Assignee Title
US2448104A (en) * 1945-12-06 1948-08-31 Chain Belt Co Differential concrete pump
DE2729159A1 (en) * 1977-06-28 1979-01-11 Rotacrete Ltd Reciprocating pump for concrete - has two cylinders performing alternate suction and delivery strokes and curved pipe from hopper
EP0016410A1 (en) * 1979-03-14 1980-10-01 Friedrich Wilh. Schwing GmbH Pump for viscous substances, in particular concrete pump
EP0197402A2 (en) * 1985-04-11 1986-10-15 PREUSSAG Aktiengesellschaft Metall Device for transporting thick matter suspensions and method for its operation

Cited By (6)

* Cited by examiner, † Cited by third party
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EP0561262A1 (en) * 1992-03-19 1993-09-22 Schwing GmbH Pump for viscous materials having cylinders, in particular two cylinder concrete pump
US5316453A (en) * 1992-03-19 1994-05-31 Friedrich Wilh. Schwing Gmbh Slurry pump with discharge cylinders, especially two-cylinder concrete pump
WO2001040649A1 (en) * 1999-11-29 2001-06-07 Hudelmaier, Jörg Thick matter pump
US6793467B2 (en) 1999-11-29 2004-09-21 Jorg Hudelmaier Thick matter pump
CN1298996C (en) * 1999-11-29 2007-02-07 约尔格·于代尔梅尔 Thick matter pump
WO2007147586A1 (en) * 2006-06-20 2007-12-27 Schwing Gmbh Two-cylinder slurry pump comprising two distribution tubes

Also Published As

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EP0315750B1 (en) 1991-07-10
ES2024604B3 (en) 1992-03-01
DE3738359A1 (en) 1989-05-24

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