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US20060193738A1 - Pump apparatus and method for continuously conveying a viscous material - Google Patents

Pump apparatus and method for continuously conveying a viscous material Download PDF

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Publication number
US20060193738A1
US20060193738A1 US11/265,651 US26565105A US2006193738A1 US 20060193738 A1 US20060193738 A1 US 20060193738A1 US 26565105 A US26565105 A US 26565105A US 2006193738 A1 US2006193738 A1 US 2006193738A1
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United States
Prior art keywords
delivery
valve
shut
viscous material
pump apparatus
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.)
Abandoned
Application number
US11/265,651
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English (en)
Inventor
Friedrich Schwing
Stefan Schwing
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Individual
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Individual
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Publication date
Priority claimed from DE200510008938 external-priority patent/DE102005008938B4/de
Priority claimed from DE200510031194 external-priority patent/DE102005031194A1/de
Application filed by Individual filed Critical Individual
Publication of US20060193738A1 publication Critical patent/US20060193738A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F04B15/023—Pumps 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators

Definitions

  • the present invention relates in general to a pump apparatus, and method for conveying a viscous material.
  • Pumps of a type involved here are used in the field of concrete conveyance for almost 80 years and operate mechanically by means of crank mechanism, i.e. crankshaft and connecting rod, with a single cylinder.
  • crank mechanism i.e. crankshaft and connecting rod
  • the cubic capacity attainable by this type of crank mechanism is slight because of the very limited piston stroke, when applied for piston diameters of about 200 mm that are still predominantly being used to date.
  • the so-called pump gate i.e. the valve system, which alternatingly connects the pump cylinder(s) with a concrete reservoir and a delivery pipeline, wear off substantially.
  • the gate mechanism still represents the most important and most critical component of the concrete pump, save for the typical concrete distributor booms which increasingly become longer in size, thereby increasing manufacturing costs which depending on the boom length can significantly surpass the costs for the actual concrete pump.
  • the gate mechanism still represents the single most wearing part of the concrete pump.
  • the switching frequency per conveyed cubic meter of concrete dropped off to a fraction.
  • the gates which necessarily also assumed the function of rock crusher so as to be able to reach their end position, wear off predominantly during the switching operation and less during the subsequent throughflow of concrete.
  • U.S. Pat. No. 5,316,453 to Schwing describes a slurry pump having two main delivery cylinders driven by a hydraulic cylinder for alternatingly conducting concrete via a transfer tube to a delivery pipeline.
  • the transfer tube includes a through channel which creates a fluid communication between the outlet of one main delivery cylinder and the delivery pipeline in a first switching mode and a fluid communication between the outlet of the other main delivery cylinder and the delivery pipeline in a second switching mode.
  • gate valve disks Disposed in a movement plane of the inlet port of the transfer tube on both sides thereof are gate valve disks which bar a return flow of concrete into the reservoir during the switch-over phase from pumping phase to intake phase of the respective main delivery cylinder.
  • the gate valve disks also permit a compression stroke for compacting concrete in a main delivery cylinder against the gate valve disks at the start of the pump stroke.
  • a compensating cylinder maintains a flow in the delivery pipeline during the switching phase.
  • U.S. Pat. No. 6,450,779 to Schwing discloses a pump which prevents a differential pressure on the sliding sealing surfaces during switch-over.
  • the parts of the switching system are subjected during shifting motion either to no load by the concrete pressure (zero pressure at a shut-off valve in the suction line) or are acted upon all-round (outside and inside) by the concrete pressure (balanced pressure in intake swivel pipe in the pressure housing).
  • This type of pump has many shortcomings.
  • the housing must be sized large enough to accommodate the swivel pipe together with the entire concrete content and to allow their rotation, and moreover must be heavy enough because it is under the delivery pressure.
  • the center distance of the main delivery cylinders is too great for a typical installation between length beams of a truck frame, or a substantial swivel angle of e.g. 250° must be accepted instead of about 70° in the case of discontinuous pumps.
  • a hydraulic drive for such a great angle is bulky, heavy, and expensive and consumes much energy and time for the switching operation so that the already brief time available for the intake operation is even further shortened.
  • a pump apparatus for conveying a viscous material includes at least two main delivery cylinders for conveying a viscous material, a delivery pipeline for conducting the viscous material in a flow direction, a switchable gate mechanism moveable between a first position to establish a connection between an outlet port of a first one of the delivery cylinders and the delivery pipeline, and a second position to establish a connection between an outlet port of a second one of the delivery cylinders and the delivery pipeline, a compensating cylinder disposed downstream of the gate mechanism and having an outlet port for discharge of the viscous material into a section of the delivery pipeline, and a shut-off valve disposed in the delivery pipeline in flow direction upstream of the outlet port of the compensating cylinder and constructed in the form of a two-port rotary gate valve.
  • the present invention resolves prior art problems by using a compensating cylinder to decrease the drop of the delivery pressure and the delivery flow in the downstream delivery pipeline to the compensating cylinder during the switching operation or to maintain the delivery pressure and delivery flow.
  • the provision of the shut-off valve in the delivery pipeline upstream of the outlet port of the compensating cylinder enables the pump apparatus to prevent a return flow of viscous material pumped by the compensating cylinder into the delivery pipeline so that the viscous material pumped into the delivery pipeline effectively maintains the delivery pressure and delivery flow.
  • viscous material is used here in a generic sense and the principles described in the following description with respect to concrete are equally applicable to any other type of viscous material, in particular those used in the food industry.
  • gate mechanism is used here in a generic sense and may involve even a system in the absence of an actual slider in a conventional sense so long as the switching modes or connection modes are realized.
  • a gate mechanism may also include transfer tubes, for example.
  • zone of spherical shape relates to any surface configuration which resembles at least a surface part of a sphere, including conical configuration.
  • two-port rotary gate valve as used in the disclosure relates to a shut-off valve with two switching modes (open/closed) and has a flow cross section which can be opened or closed by turning a swivel body.
  • the rotary motion can suitably be implemented via a sealed stem from outside the valve housing.
  • the swivel body may also have the shape of a disk (rotary flat gate valve).
  • a two-port rotary gate valve as shut-off valve enables realization of a constant volume of the flow rate in the delivery pipeline, even during switch-over of the shut-off valve.
  • the swivel body does not execute a positive or negative pump function as a result of its switching operation.
  • Another advantage of the application of a two-port rotary gate valve is the complete disposition of the swivel body in the delivery pipeline in the absence of any movement to a lateral space. There is no translatory motion out of the delivery pipeline. Sealing of the rotary motion of a drive shaft can be realized without any problem.
  • the two-port rotary gate valve is easy to manufacture and has only few components that can easily be controlled.
  • a pump apparatus enables a change of the pressure level upstream of the closed shut-off valve in relation to the delivery pressure downstream of the shut-off valve.
  • the switching operation of the gate mechanism can be implemented in relation to the delivery pressure in the delivery pipeline at a different, preferably lower, pressure level of the viscous material.
  • the pressure level of the viscous materials between a reservoir and the main delivery cylinders and the upstream part of the delivery pipeline between the main delivery cylinders and the shut-off valve can thus be equalized.
  • the viscous materials surround components of the switching gate mechanism or are situated within the components of the gate mechanism.
  • shut-off valve When realizing a like pressure level of the viscous materials or even lowering the pressure level of the viscous materials, these components of the gate mechanism can be moved easily. Likewise, the shut-off valve can be operated easily. As the concrete volume upstream of the shut-off valve is suitably compressed, to a same pressure level anteriorly of the port of the shut-off valve as in the delivery pipeline downstream of the shut-off valve, equalized pressure is realized during switching operation. Thus, switching takes place under similar favorable condition as the operation of the gate mechanism which is able to switch absent any pressure in the flow medium. This is realized by the shut-off valve and there is no risk of return flow of viscous material from the delivery pipeline when the pressure drops.
  • a pump apparatus according to the present invention may also be constructed with more than two main delivery cylinders.
  • the gate mechanism may be constructed to connect the second delivery cylinder with a reservoir, when assuming the first switching position, and to connect the first delivery cylinder with the reservoir, when assuming the second switching position.
  • the first main delivery cylinder feeds viscous material into the delivery pipeline
  • the second main delivery cylinder draws viscous material from the reservoir
  • the second main delivery cylinder feeds viscous material into the delivery pipeline
  • the first main delivery cylinder draws viscous material from the reservoir.
  • the gate mechanism may hereby be constructed in the form of a transfer tube. As a consequence of this construction, the one main delivery cylinder that is not in pumping mode is able to draw viscous material from the reservoir while the other main delivery cylinder is in pumping mode to feed viscous material into the delivery pipeline.
  • the gate mechanism may be constructed of several parts.
  • the gate system may include separate slides which respectively open the connection of the first main delivery cylinder to the delivery pipeline, while closing the respective port of the second main delivery cylinder. A further slide closes the connection of the first main delivery cylinder to the reservoir at the same time and opens its connection to the delivery pipeline.
  • a gate mechanism using a transfer tube An example of a transfer tube is described in U.S. Pat. No. 4,373,875 to which reference is made herewith and the entire specification and drawings of which are expressly incorporated herein by reference.
  • the compensating cylinder through which the delivery flow circulates may be constructed to have an inlet port separate to the outlet port.
  • Other examples of a compensating cylinder for incorporation in a pump apparatus according to the present invention are described in U.S. Pat. No. 3,663,129 or U.S. Pat. No. 3,963,385 or U.S. Pat. No. 5,316,453, to which reference is made herewith.
  • the shut-off valve may be disposed in flow direction downstream of the gate mechanism.
  • a switchable gate mechanism e.g., a transfer tube
  • a construction of the shut-off valve separate from the gate mechanism and downstream of the gate mechanism is simpler to implement.
  • the shut-off valve is intended to completely prevent a return flow or at least limit the amount of viscous material being conveyed back in opposition to the desired flow direction as a result of the pump stroke of the compensating cylinder.
  • the shut-off valve may be provided in the various branches for example. Regardless whether one or more shut-off valves are provided, care should be taken to separate the conveyance of viscous material as maintained by the compensating cylinder from the area of the pump apparatus where no conveyance takes place as a result of the switching operation.
  • the shut-off valve may be controlled by a control circuit (hydraulic, pneumatic, electric or other manner) used separately for control of the main delivery cylinders and/or switching of the gate mechanism.
  • a control circuit hydraulic, pneumatic, electric or other manner
  • the gate mechanism may be provided with a self-adjusting ring in an area of its inlet port for connection to the outlet ports of the first and second delivery cylinders.
  • a self-adjusting ring of a type involved here is described for example in U.S. Pat. No. 4,465,441, to which reference is made herewith, and involves a cutting ring which is supported by a flexible rubber ring.
  • the shut-off valve may have a casing and a valve body, wherein the casing is provided with an area disposed in surrounding relationship to a port of the shut-off valve and constructed to have a spherical shape, with the valve body being swingable about a pivot axis and constructed to have a zone of spherical shape complementing the spherical shape of the casing area.
  • the casing area in surrounding relationship to the port of the shut-off valve includes also regions which are formed by components installed in the casing, such as, e.g., the region formed by at least a portion of the valve body confronting surfaces of a self-adjusting ring which is placed in the casing.
  • the casing itself may for example have a cylindrical configuration, and the zone of spherical shape may be formed by the self-adjusting ring placed in the cylindrical wall surface of the casing.
  • shut-off valve For proper operation of the shut-off valve, a pipeline guided through the valve body should be brought into registration with the port of the shut-off valve in a switching situation. The shut-off valve is then open. Closing of the shut-off valve requires a sealing of the port by surface zones of the valve body.
  • the complementing zones of spherical shape between the shut-off valve casing and the valve body permit easy swiveling of the valve body and use of a rotation symmetrical self-adjusting ring.
  • those portions of the valve body and shut-off valve that do not contribute to a sealing of the port may be configured in any form or shape.
  • a self-adjusting ring may be provided in surrounding relationship to the port of the shut-off valve.
  • This self-adjusting ring may be configured as described above and referred to in U.S. Pat. No. 4,465,441, with the difference residing in the disposition of the self-adjusting ring on the casing instead of a disposition on the sides of the moving element (valve body).
  • the self-adjusting ring has a surface in confronting relationship to the valve body, with the surface of the self-adjusting ring formed with a zone of spherical shape to complement the zone of spherical shape of the valve body.
  • the casing and the valve body may be flattened in a plane perpendicular to the pivot axis.
  • the shut-off valve may exhibit a slender configuration.
  • the compensating cylinder may include a displaceable pipe bend which forms part of the delivery pipeline and is constructed to increase or decrease a volume of the delivery pipeline in dependence on an adjustment of the pipe bend. Resembling the U-shaped outer tube of a trombone, the compensating cylinder is able to store viscous material in the entire delivery pipeline through increase of the volume of the delivery pipeline by moving the pipe bend out.
  • pipe bend should not be limited to a U-shaped configuration but may involve also other constructions which generally follow the concepts outlined here.
  • the compensating cylinder executes a pump stroke after the pump stroke of a main delivery cylinder is over.
  • the pipe bend is moved back to thereby decrease the volume of the delivery pipeline and maintain the further conveyance in flow direction.
  • the pipe bend may have an upstream inlet port which embraces an upstream part of the delivery pipeline, and a downstream outlet port which is embraced by a downstream part of the delivery pipeline.
  • the pipe portion of smaller cross section is always received ⁇ as viewed in flow direction ⁇ in the pipe portion of greater cross section.
  • the flow is prevented from flowing frontally onto a seal, as would be the case if an upstream pipe section of greater cross section were to be placed over a downstream pipe portion of smaller cross section.
  • a method of conveying a viscous material includes the steps of pumping viscous material during a pump stroke in a first switching mode from a main delivery cylinder to a delivery pipeline, while a compensating cylinder executes an intake stroke to receive viscous material, closing a shut-off valve disposed in the delivery pipeline in flow direction upstream of an outlet port of the compensating cylinder after conclusion of the pump stroke by the main delivery cylinder, and initiating an intake stroke by the main delivery cylinder in a second switching mode only after the shut-off valve has been closed.
  • the gate mechanism can be switched in an environment of low pressure and not at delivery pressure. Energy is thereby reduced for switching the gate mechanism and the presence of substantial friction forces to expose the gate mechanism is eliminated.
  • the switching operation from one switching mode of the gate mechanism to the other switching mode thus starts only after commencement of the intake stroke of the main delivery cylinder which has previously pumped viscous material in the one switching mode into the delivery pipeline.
  • the main delivery cylinders are operated in opposite mode. This greatly simplifies the control for the main delivery cylinders.
  • the pressure of a working fluid of a delivery cylinder may be reduced during switching operation of the gate mechanism. This saves time as drawn concrete volume is already slightly compressed during switching operation. As a consequence of a reduction in pressure, there is no interference in the switching operation of the gate mechanism.
  • the pressure of the viscous material conducted upstream of the shut-off valve may be increased before opening the shut-off valve.
  • the pressure is increased to a pressure level corresponding to a pressure of the viscous material conducted downstream of the shut-off valve.
  • FIG. 1 is a partly sectional schematic illustration of a pump apparatus according to the present invention
  • FIG. 2 is a schematic sectional view of a shut-off valve of the pump apparatus
  • FIG. 3 is a schematic sectional view of the shut-off valve, taken along the line III-III in FIG. 2 ;
  • FIG. 4 is a schematic sectional view of the shut-off valve in closed position.
  • FIG. 1 there is shown a partly sectional schematic illustration of a pump apparatus according to the present invention, including two main delivery cylinders 1 , 2 .
  • Each main delivery cylinder 1 , 2 accommodates a piston 14 which can move into the main delivery cylinder 1 , 2 , as indicated by arrow A, to realize a pump stroke, or in a direction out of the main delivery cylinder 1 , 2 , as indicated by arrow C, to realize an intake stroke.
  • a gate mechanism generally designated by reference numeral 3 and having a swingable transfer tube 12 with an inlet port 15 for selective fluid communication with either one of the main delivery cylinders 1 , 2 .
  • the transfer tube 12 has a self-adjusting ring 17 for connection to the outlet ports of the delivery cylinders 1 , 2 .
  • the transfer tube 12 is fluidly connected to a first section 4 of a delivery pipeline, generally designated by reference numeral 5 , with a shut-off valve, generally designated by reference numeral 6 being disposed in the pipeline section 4 .
  • a compensating cylinder, generally designated by reference numeral 7 connects the pipeline section 4 with a second pipeline section 8 of the delivery pipeline 5 .
  • the gate mechanism 3 includes a housing 10 having an interior space 11 for accommodating the transfer tube 12 which is operated by a hydraulic cylinder 13 via a connecting rod 16 .
  • the transfer tube 12 can be shifted between a first switching mode for establishing a connection between the outlet of the main delivery cylinder 1 and the pipeline section 4 , and a second switching mode for establishing a connection between the outlet of the main delivery cylinder 2 and the pipeline section 4 .
  • a reservoir or priming tank is fluidly connected to the interior space 11 of the gate mechanism 3 .
  • the shut-off valve 6 is configured in the form of a two-port rotary gate valve and includes a casing 20 and a valve body 21 received in the casing 20 and formed with a through channel 23 .
  • the valve body 21 can be moved by a hydraulic cylinder 22 between an open position in which the through channel 23 is aligned with two opposing ports 24 , 25 of the shut-off valve 6 , as shown in FIG. 2 , and a closed position in which the connection between the through channel 23 and the ports 24 , 25 is cut, as shown in FIG. 4 .
  • the compensating cylinder 7 includes a pipe bend 30 having an upstream end 31 of greater cross section than a downstream end 32 of the pipeline section 4 so that the upstream end 31 of the pipe bend 30 can be pushed over the downstream end 32 of the pipeline section 4 .
  • the downstream end 33 of the pipe bend 30 has a cross section which is smaller than an upstream end 34 of the pipeline section 8 so that the downstream end 33 of the pipe bend 30 can be inserted into the upstream end 34 of the pipeline section 8 .
  • Seals 35 , 36 are provided between the pipe bend 30 and the pipeline sections 4 , 8 .
  • a movement of the pipe bend 30 in and out in relation to the delivery pipeline 5 is realized by a hydraulic cylinder 37 via a connecting rod 38 secured to the pipe bend 30 .
  • FIGS. 2 and 3 show the shut-off valve 6 in open position.
  • the shut-off valve 6 has a self-adjusting ring in the form of a cutting ring 26 which is supported by a flexible rubber ring 27 upon a pipe flange 28 .
  • the casing 20 of the shut-off valve 6 has a zone of spherical shape in an area surrounding the port 24 , whereas the pivotable valve body 21 has a complementary zone 29 of spherical shape.
  • the valve body confronting surface of the cutting ring 26 of the self-adjusting ring is also configured to have a zone of spherical shape.
  • the casing 20 may otherwise have flattened areas to save installation space.
  • FIG. 4 shows the shut-off valve 6 in closed position.
  • the spherical-shaped zone 29 of the valve body 21 is moved to a position in front of the port 24 .
  • the valve body 21 seals off the port 24 in cooperation with the cutting ring 26 , urged by the flexible rubber ring 27 against the valve body 21 .
  • FIG. 1 shows the main delivery cylinder 1 of the pump apparatus in a starting phase of the pump stroke.
  • the transfer tube 12 is moved by the hydraulic cylinder 13 in the direction of the outlet port of the main delivery cylinder 1 .
  • the main delivery cylinder 1 has already started its pump stroke.
  • concrete from the main delivery cylinder 1 is slightly pre-compressed against a cutting ring of the transfer tube 12 .
  • the shut-off valve 6 is closed so that concrete being pumped into the pipeline section 4 build up pressure in the pipeline section 4 .
  • the main delivery cylinder 1 is now able to pump concrete through the pipeline section 4 and the compensating cylinder 7 into the pipeline section 8 .
  • the hydraulic cylinder 37 moves the pipe bend 30 to the outside by the concrete pressure acting thereon (to the left in FIG. 1 ) to thereby increase the volume of the delivery pipeline 5 .
  • the thus extended pipe bend 30 is now able to store concrete.
  • shut-off valve 6 is closed. As the pipe bend 30 retracts in a direction indicated by arrow B, the concrete stored in the pipe bend 30 is pumped into the pipeline section 8 so that pressure in the delivery pipeline 5 is maintained. Return flow of concrete into the pipeline section 4 is prevented by the closed shut-off valve 6 .
  • the main delivery cylinder 1 commences the intake stroke immediately following the closing of the shut-off valve 6 .
  • concrete in the transfer tube 12 and the pipeline section 4 up to the shut-off valve 6 relaxes.
  • the transfer tube 12 is then moved in the direction of the other switching position by the hydraulic cylinder 13 .
  • the pressure difference between concrete in the transfer tube 12 and in the interior space 11 of the gate mechanism 3 is substantially negated so that the transfer tube 12 can easily be moved.
  • the main delivery cylinder 2 executes the intake stroke, as indicated by arrow C, to draw concrete from the interior space 11 , whereby additional concrete is able to flow from the unillustrated reservoir to the interior space 11 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US11/265,651 2005-02-26 2005-11-02 Pump apparatus and method for continuously conveying a viscous material Abandoned US20060193738A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102005008938.0 2005-02-26
DE200510008938 DE102005008938B4 (de) 2005-02-26 2005-02-26 Pumpvorrichtung und Verfahren zur kontinuierlichen Förderung breiiger Massen
DE200510031194 DE102005031194A1 (de) 2005-07-01 2005-07-01 Pumpvorrichtung und Verfahren zur kontinuierlichen Förderung breiiger Massen
DE102005031194.6 2005-07-01

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US20060193738A1 true US20060193738A1 (en) 2006-08-31

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US11/265,651 Abandoned US20060193738A1 (en) 2005-02-26 2005-11-02 Pump apparatus and method for continuously conveying a viscous material

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US (1) US20060193738A1 (fr)
WO (1) WO2006089772A1 (fr)

Cited By (6)

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Publication number Priority date Publication date Assignee Title
US20110274572A1 (en) * 2009-01-16 2011-11-10 Friedrich Schwing Method for feeding pasty masses and pump device for feeding pasty masses
CN102588268A (zh) * 2012-03-06 2012-07-18 韩国民 混凝土输送泵分配阀
CN103821688A (zh) * 2014-01-20 2014-05-28 三一汽车制造有限公司 一种泵送机构、泵送控制方法及混凝土泵送设备
US20170101986A1 (en) * 2014-06-23 2017-04-13 Putzmeister Solid Pumps Gmbh Device and method for damping pressure fluctuations in the delivery line of a thick-matter pump
CN114962721A (zh) * 2022-05-25 2022-08-30 中国电力工程顾问集团华东电力设计院有限公司 一种旋转式黏稠物料换向器
US11629707B2 (en) * 2017-07-27 2023-04-18 Weir Minerals Netherlands B.V. Pump system for handling a slurry medium

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US20110274572A1 (en) * 2009-01-16 2011-11-10 Friedrich Schwing Method for feeding pasty masses and pump device for feeding pasty masses
CN102282370A (zh) * 2009-01-16 2011-12-14 弗里德里希·施温 用于输送糊状物料的方法和用于输送糊状物料的泵装置
US9046086B2 (en) * 2009-01-16 2015-06-02 Friedrich Schwing Method for feeding pasty masses and pump device for feeding pasty masses
US20160040659A1 (en) * 2009-01-16 2016-02-11 Friedrich Schwing Pump devices for feeding pasty masses
CN102588268A (zh) * 2012-03-06 2012-07-18 韩国民 混凝土输送泵分配阀
CN103821688A (zh) * 2014-01-20 2014-05-28 三一汽车制造有限公司 一种泵送机构、泵送控制方法及混凝土泵送设备
US20170101986A1 (en) * 2014-06-23 2017-04-13 Putzmeister Solid Pumps Gmbh Device and method for damping pressure fluctuations in the delivery line of a thick-matter pump
US10422327B2 (en) * 2014-06-23 2019-09-24 Putzmeister Solid Pumps Gmbh Device and method for damping pressure fluctuations in the delivery line of a thick-matter pump
US11629707B2 (en) * 2017-07-27 2023-04-18 Weir Minerals Netherlands B.V. Pump system for handling a slurry medium
CN114962721A (zh) * 2022-05-25 2022-08-30 中国电力工程顾问集团华东电力设计院有限公司 一种旋转式黏稠物料换向器

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