EP0213419B1 - Steuerschieber für Dickstoffpumpen - Google Patents

Steuerschieber für Dickstoffpumpen Download PDF

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Publication number
EP0213419B1
EP0213419B1 EP86110730A EP86110730A EP0213419B1 EP 0213419 B1 EP0213419 B1 EP 0213419B1 EP 86110730 A EP86110730 A EP 86110730A EP 86110730 A EP86110730 A EP 86110730A EP 0213419 B1 EP0213419 B1 EP 0213419B1
Authority
EP
European Patent Office
Prior art keywords
slide rod
slide
housing
seal
working
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.)
Expired
Application number
EP86110730A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0213419A1 (de
Inventor
Friedrich Dipl.-Ing. Schwing
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.)
Friedrich Wilhelm Schwing GmbH
Original Assignee
Friedrich Wilhelm Schwing 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
Application filed by Friedrich Wilhelm Schwing GmbH filed Critical Friedrich Wilhelm Schwing GmbH
Priority to AT86110730T priority Critical patent/ATE48025T1/de
Publication of EP0213419A1 publication Critical patent/EP0213419A1/de
Application granted granted Critical
Publication of EP0213419B1 publication Critical patent/EP0213419B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/91—O-ring seal

Definitions

  • the invention relates to a control slide for thick matter pumps according to the preamble of claim 1.
  • the invention relates in particular to what concrete convey.
  • the control slide valve according to the invention is suitable for two-cylinder high-density pumps, wherein two control slide valves can be arranged in its slide housing, which move back and forth in push-pull. Each slide then controls a cylinder of the pump so that it sucks in the thick material in one end position of the control slide and presses it into a delivery line in the opposite slide position. Since the slides are generally identical among themselves, a description of one of these slides is sufficient.
  • the forward and backward movement of the slide requires the transfer of kinetic energy in both directions.
  • working pistons are provided, which are preferably driven hydraulically by a pressure medium.
  • the slide rod is led out of the housing with both ends, which among other things. has the advantage that the end faces of the slide rod in the housing cannot be blocked with caking thick material.
  • the sealing of the slide rod is necessary in order to retain the liquid component of the thick matter enriched with fine particles in the housing, in which the thick matter is under considerable pressure under the influence of the pumping process. Since the slide rod cannot be sealed against the thick material in the housing, or at least cannot be completely sealed off, it leads solid particles through the seal to the outside during its forward and return flow. It is therefore necessary to clean the ends of the slide rod emerging from the slide housing.
  • the invention is based on a previously known control slide for thick matter pumps from (DE-B 2 700 800).
  • the distance that the drive cylinder maintains from the slide housing serves to accommodate so-called couplings, which connect the reciprocating parts of the drive to the slide rod ends and are effective in both directions. This necessitates external dimensions which considerably exceed those of the working pistons or working cylinders.
  • the described operative connections between the working piston and the slide rod can therefore not be accommodated in extensions of the working cylinder.
  • otherwise known control slides for thick matter pumps which act on both slide rod ends with single-acting drive cylinders (DE-B-1 905 706).
  • the cylinders are flanged directly to the valve housing with the aid of a tubular extension, so that there is a free distance between the cylinder end face and the valve housing.
  • the tubular extension of the working cylinder accommodates the seal arranged on the outside of the housing and a bushing which adjoins the outside and inside and is separated therefrom as a slide guide. Between the outer guide bushing and the working piston, a cylindrical space is created in the tubular extension, increasing and decreasing in time with the working cycles, through which an oil fluid is guided, which cleans the slide rod behind the seal.
  • the seals are arranged in the guide bushings, which have rinsing chambers through which a rinsing liquid likewise circulates. It has been found that fine grain from the thick material is guided to the outside between the guide surface of the bush and the slide rod. Concrete pumps are mostly so-called cement glue, i.e. a substance that also sets under water.
  • the flushing liquid which usually consists entirely or partly of oil, is intended to clean the push rod end, i.e. detach and remove the entrained particles.
  • the process is not perfect under practical conditions. The result of this is that, depending on the type of thick matter, small amounts of solid get into the outer guide after they have overcome the seal and are no longer completely removed from it.
  • the invention has for its object to simplify the structure of the control slide and to prevent its impairment by solids, which are carried by the slide rods.
  • the slide rod guide is arranged on the inside, so that an external slide rod guide is not required.
  • the seal on the other hand, is on the outside, so that the solid is retained by stripping off the slide rod, but on the other hand move through the guide and therefore cannot lock the slide rod.
  • the invention can therefore be satisfied with the wiping action of the seal, which despite its imperfection is sufficient to prevent large external contamination of the valve housing, but does not impair the guidance and therefore cannot brake or even block the slide rod. To the extent that these amounts of solid produce wear in the seal, the invention takes this into account by the easy interchangeability of the seal.
  • the invention has the advantage that it eliminates the flushing that has been generally used up to now, without having to reckon with contamination which can impair the function of the control slide thereon. As far as difficulties arise due to the entrained fine grain of the thick matter, these occur on the seal and not on the guide. However, the seal can also be replaced at short notice in the manner described. By eliminating the rinsing, not only is the technical outlay associated with this saved, but it is also prevented that solid particles taken up by the rinsing form sludge in the rinsing liquid, which in other parts of the thick matter pump, e.g. B. can lead to difficulties in the hydraulic working medium.
  • the guide can also consist of a housing bore, the guide surfaces of which are hardened.
  • a control slide (not shown) and the control slide (1) corresponding to it are provided for a two-cylinder piston pump for conveying concrete.
  • the slide plate not shown, is attached to a cylindrical slide rod (2), the outer end (3) of which is led out of a slide housing (4).
  • the slide rod is seated in a guide bushing (5) and, moreover, runs in a cylindrical recess in the housing.
  • the end of the guide bushing (5) is supported in a blind bore (6) in an outer housing plate (7).
  • the plate (7), as shown at (8), for example, is screwed to the housing (4).
  • the slide rod end penetrates an annular seal (9), which is seated in a blind bore (10) of a flange (11).
  • the flange (11) is in turn ring-shaped and is fastened to the housing plate (7) with several screws, one of which is shown for example at (12).
  • a bell housing (14) is welded to the housing plate (7). It consists of a flat or curved cover plate (15) and pulled-down side walls (16), the free edge of which is shown in dashed lines at (17). The free end of the bell housing is welded to an end plate (18) which runs parallel to the housing plate (7). The bell (14) is therefore accessible from below.
  • a tubular plunger (20) moves in the interior (19) of the bell. This is sealed with a stuffing box (21). It runs in a working cylinder (22) which can be acted upon by (23) hydraulic working fluid and is single-acting.
  • the working cylinder is screwed to the plate (18) of the bell (14) with several screws (24) arranged on a circle.
  • the front end of the tubular piston is closed and provided with a bearing cap (25).
  • a snap ring (28) sits behind the spherical bearing (25) of the tubular piston (20) and holds an annular protective disk (29) on the front end of the piston.
  • the protective disk (29) serves as a splash guard, which keeps the surface of the tubular piston (20) free of solid matter that occurs unexpectedly on the seal (9).
  • the state according to FIG. 2 can be achieved in that the tubular piston (20) is pushed back by hand when the control valves of the working cylinder (22) are in the appropriate position. This is possible because you can reach the cattail through the lower opening of the bell (14).
  • the screw connection (12) has been loosened, the flange (11) can be removed together with the ring seal (9) by pulling it over the end (3) of the slide rod (2).
  • the seal can be installed in the opposite way (9).
  • the tubular piston (20) is guided to the right as shown in FIG. 1 by the pressure medium penetrating into the working cylinder (22) until the spherical caps (25 and 26) lie one on top of the other.
  • the slide rod is then moved to its right end position, which is shown in Figure 1.
  • the slide rod By reversing the cylinder (22) and acting on the tubular piston, not shown, which actuates the other end of the slide rod (2), the reverse movement is initiated, which is ended in the left end position of the tubular piston (20).
  • the slide rod therefore performs a forward and backward movement, so that the guide (5) on the inside and the seal (9) separate therefrom is arranged in front of it on the slide housing (4).
  • there is a gap (30) between the calottes (25 and 26) which is used for assembly and disassembly purposes.
  • tie rods can be provided for fastening the working cylinder to the slide housing (4).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Multiple-Way Valves (AREA)
  • Materials For Medical Uses (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Fluid-Driven Valves (AREA)
EP86110730A 1985-08-10 1986-08-02 Steuerschieber für Dickstoffpumpen Expired EP0213419B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86110730T ATE48025T1 (de) 1985-08-10 1986-08-02 Steuerschieber fuer dickstoffpumpen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3528746 1985-08-10
DE19853528746 DE3528746A1 (de) 1985-08-10 1985-08-10 Steuerschieber fuer dickstoffpumpen

Publications (2)

Publication Number Publication Date
EP0213419A1 EP0213419A1 (de) 1987-03-11
EP0213419B1 true EP0213419B1 (de) 1989-11-15

Family

ID=6278214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110730A Expired EP0213419B1 (de) 1985-08-10 1986-08-02 Steuerschieber für Dickstoffpumpen

Country Status (12)

Country Link
US (1) US4852467A (el)
EP (1) EP0213419B1 (el)
JP (1) JPH0788812B2 (el)
KR (1) KR950013010B1 (el)
CN (1) CN1008387B (el)
AT (1) ATE48025T1 (el)
BR (1) BR8603800A (el)
DE (2) DE3528746A1 (el)
ES (1) ES2001196A6 (el)
GR (1) GR862040B (el)
TR (1) TR22569A (el)
ZA (1) ZA866002B (el)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007111689A2 (en) * 2005-11-08 2007-10-04 Good Earth Tools, Inc. Sealing rings for abrasive slurry pumps

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2042078A (en) * 1934-07-20 1936-05-26 Antoine Cossette Pump rod assembly
US2010129A (en) * 1934-09-26 1935-08-06 Ingersoll Rand Co Valve assembly
US2787126A (en) * 1952-12-29 1957-04-02 Gen Electric Hydraulically operated valves
US2936996A (en) * 1956-12-10 1960-05-17 Acf Ind Inc Piston operated valve
US3070070A (en) * 1960-01-25 1962-12-25 Godfrey H Trevor Packing glands
BE650160A (el) * 1963-07-06
GB1141061A (en) * 1965-03-02 1969-01-22 Davy & United Eng Co Ltd Manipulators
DE1905706C2 (de) * 1969-02-05 1970-11-12 Schwing Friedrich Wilh Steuerschieber fuer Dickstoffpumpen
BR7607022A (pt) * 1976-10-20 1978-05-09 Schwing Gmbh F Registro de distribuicao para bombas de materias conistentes
US4089253A (en) * 1976-12-01 1978-05-16 Clark Equipment Company Linear fluid motor
DE2700800C3 (de) * 1977-01-11 1980-10-16 Herbert 4690 Herne Kuhlmann Steuerschieber für Betonpumpen
JPS6137476U (ja) * 1984-08-09 1986-03-08 クロダ・ワツツ株式会社 空圧駆動式ピストンポンプ

Also Published As

Publication number Publication date
US4852467A (en) 1989-08-01
KR870002376A (ko) 1987-03-31
BR8603800A (pt) 1987-03-17
GR862040B (en) 1986-12-24
CN1008387B (zh) 1990-06-13
DE3666968D1 (en) 1989-12-21
ZA866002B (en) 1987-03-25
EP0213419A1 (de) 1987-03-11
KR950013010B1 (ko) 1995-10-24
TR22569A (tr) 1987-11-20
CN86105968A (zh) 1987-03-11
JPH0788812B2 (ja) 1995-09-27
ATE48025T1 (de) 1989-12-15
DE3528746A1 (de) 1987-02-12
JPS6291670A (ja) 1987-04-27
ES2001196A6 (es) 1988-05-01

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