GB1573291A - Piston cylinder pump - Google Patents

Piston cylinder pump Download PDF

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Publication number
GB1573291A
GB1573291A GB8280/78A GB828078A GB1573291A GB 1573291 A GB1573291 A GB 1573291A GB 8280/78 A GB8280/78 A GB 8280/78A GB 828078 A GB828078 A GB 828078A GB 1573291 A GB1573291 A GB 1573291A
Authority
GB
United Kingdom
Prior art keywords
piston
cylinder
screw
opening
screw bushing
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
GB8280/78A
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.)
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei AG
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 Krauss Maffei AG filed Critical Krauss Maffei AG
Publication of GB1573291A publication Critical patent/GB1573291A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
    • G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
    • G01F11/029—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type provided with electric controlling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7174—Feed mechanisms characterised by the means for feeding the components to the mixer using pistons, plungers or syringes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
    • B01F35/8822—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances using measuring chambers of the piston or plunger type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
    • B29B7/603—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material in measured doses, e.g. proportioning of several materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/09—Pistons; Trunk pistons; Plungers with means for guiding fluids

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Actuator (AREA)
  • Sealing Devices (AREA)
  • Sealing Material Composition (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

(54) PISTON CYLINDER PUMP (71) We, KRAUss-MAFFEI AKTIEN GESELLSCHAFT, a German Body Corporate, of 2 Krauss-Maffei-Strasse, München, German Federal Republic, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to a piston and cylinder pump for the apportioning of plastics material containing abrasive tillers. When abrasive fillers are used for acting on the piston, possibly the apportioning piston, the packing of such an arrangement is subjected to increased wear, which necessitates a frequent adjustment of the packing.It has hitherto been necessary to dismantle the piston cylinder unit at least partially for this purpose, which entails considerable disadvantages, particularly if frequent adjustments are necessary.
The present invention enables such dismantling and the consequential production and time loss connected therewith to be avoided.
According to the invention there is provided a piston and cylinder pump for the apportioning of plastics material containing abrasive fillers comprising a piston carried on a piston rod; a cylinder accommodating the piston; a screw bushing screw threaded to the piston; sealing means positioned between the screw bushing and a portion of the piston to seal the piston in the cylinder; a toothing formed on the radially outer surface of the screw bushing; an opening in the wall of the cylinder enabling access to said toothing in one position of the piston in the cylinder, whereby the effectiveness of said sealing means is adjustable by rotation of the screw bushing relative to the piston by means of a tool inserted through said opening in the cylinder wall.
The provision of a screw bushing for adjusting the sealing means i.e. the piston packing furthermore compensates for settlement phenomena in a new packing (packing adaptation); finally, the adjustability of the packing allows from the outset a greater tolerance on the packings.
The invention is particularly suitable for further developing the piston and cylinder pump mentioned in Patent Application No.
9023/77 (Serial No. 1550750), in which plastics material components with abrasive characteristics are apportioned. The task underlying said patent is in principle the same as that formulated above, namely to allow an accurate and stepless apportioning of abrasive plastics material components in a wear-resistant and simple device.
The toothing of the screw bushing may be radially spaced from the inner wall of the cylinder. This enables the adjustment to be easily carried out even ifthe opening in the cylinder wall is small.
Preferably, the opening is provided inthe cylinder in such a position as to enable access to the toothing of the screw bushing when the piston is in an end of stroke position.
In order to secure the piston against rotation during the adjustment process, in a preferred embodiment of the invention a second opening is provided in the wall of the cylinder which second opening is adjacent to the first opening, and one or more radial bores are provided in the piston or in the piston rod in such a position that access to one of said bores through said second opening is possible when the piston is in the position where access to the toothing through the first opening is possible.
Preferably, in the screw threaded part of the screw bushing there is provided an annular groove, in which there is inserted a rubber or plastics material ring serving as a screw thread brake. This measure guards the desired setting of the screw bushing against unintentional adjustment during operation of the pump.
The invention is illustrated in the drawing with reference to an exemplified embodiment which will be explained hereafter. In the drawing: Figure 1 shows the piston and cylinder pump in a longitudinal section, and Figure 2 shows a detail of Figure 1 in a top view.
The piston cylinder unit comprises a cylinder 1 and a double piston 4 constituted by a driving piston 5 and an apportioning piston 6 carried on a common piston rod 13.
The cylinder 1 is functionwise divided at the upper end into a driving cylinder 2, in which the driving piston 5 is situated, and at the lower end into an apportioning cylinder 3, in which the apportioning piston 6 is situated.
At this end, the apportioning cylinder 3 is closed by a screw-on flange 7, in which two bores 8 and 9 are recessed, of which one (9) serves for the delivery of plastics material components from an adjustable variabledisplacement pump 27 through a line 28 to an apportioning chamber 16 and the other (8) serves for the removal thereof from the apportioning chamber 16. Screwed on the upper end of the driving cylinder 2 is an end cover 11 which comprises a bore 10 for the delivery of the pressure medium and a bore for the reception of a control rod 12 which is fitted to the double piston 4. This rod forms part of the piston rod 13 which connects the pistons 5 and 6 and to which the pistons 5 and 6 are secured by means of screw threads.
As a result of the pressure medium supplied through the bore 10, the driving piston 5, and its packing 14 is accordingly subjected to a given stress, while the apportioning piston 6 and its packing 15 are subjected to greater stress due to the fact that plastics material components containing abrasive substances are delivered into the apportionitig chamber 16 through the bore 9, while the bore 8 is shut off by a shut-off valve 30, and are subsequently expelled through the bore 8 on account of the driving piston 5 being acted on and the bore 9 being shut off by a shut-off valve 29.
According to this embodiment of the invention, this is compensated for in that a screw bushing 17 is screwably, that is to say longitudinally movably arranged on the apportioning piston 6. A packing 15 is provided between the lower face of the screw bushing 17 and a piston collar 18 integral with the piston 6. The sealing effect of the packing 15 can be adjusted by rotation of the screw bushing 17.
This is effected without any dismantling of the piston cylinder unit in that a rod-like tool is introduced through an opening 19 in the central wall area of the cylinder 1, which tool engages in a toothing 21 of the screw bushing 17, and the screw bushing 17 is rotated relative to the apportioning piston 6 by means of this tool. During this process, the space 23, which is reduced in size, is ventilated through ventilation holes 24.
If necessary, another rod-like tool can be introduced during this adjustment of the packing 15 through a second opening 20, which is arranged above the opening 19, and be placed into a bore 22 or one of several bores 22, thus causing the double piston 4 to be secured against rotation. The screw bushing 17 is guarded against any unintentional rotation during operation by a plastics material ring 26 which serves as a screw thread brake and is inserted in an annular groove 25 of the threaded portion of the screw bushing 17.
In the example shown, the openings 19 and 20 are circular and therefore require little space. This is made possible in that the adjustment of the screw bushing 17 is effected in the upper end position of the double piston 4, i.e. in a very specific area of the cylinder 1, and in that the toothing 21 is recessed in the screw bushing 17 over the circumference thereof.
WHAT WE CLAIM IS: 1. A piston and cylinder pump for the apportioning of plastics material containing abrasive fillers comprising a piston carried on a piston rod; a cylinder accommodating the piston; a screw bushing screw threaded to the piston; sealing means positioned between the screw bushing and a portion of the piston to seal the piston in the cylinder; a toothing formed on the radially outer surface of the screw bushing; an opening in the wall of the cylinder enabling access to said toothing in one position of the piston in the cylinder, whereby the effectiveness of said sealing means is adjustable by rotation of the screw bushing relative to the piston by means of a tool inserted through said opening in the cylinder wall.
2. A piston and cylinder pump as claimed in claim 1, wherein the toothing of the screw bushing is radially spaced from the inner wall of the cylinder.
3. A piston and cylinder pump as claimed in claim 1 or 2, wherein the opening is provided in the cylinder in such a position as to enable access to the toothing of the screw bushing when the pistonis in an end of stroke position.
4, A piston and cylinder pump as claimed in any one of claims 1 to 3, wherein a second opening is provided in the wall of the cylinder which second opening is adjacent to the first opening, and one more radial bores are provided in the piston or in the piston rod in such a position that access to one of said bores through said second opening is possible when the second piston is in the position where access to the toothing through the first opening is possible.
5. A piston and cylinder pump as claimed in any one of claims 1 to 4, wherein the screw threaded part of the screw bushing there is provided in annular groove, in which there is inserted a rubber or plastics material ring serving as a screw thread brake.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. The invention is illustrated in the drawing with reference to an exemplified embodiment which will be explained hereafter. In the drawing: Figure 1 shows the piston and cylinder pump in a longitudinal section, and Figure 2 shows a detail of Figure 1 in a top view. The piston cylinder unit comprises a cylinder 1 and a double piston 4 constituted by a driving piston 5 and an apportioning piston 6 carried on a common piston rod 13. The cylinder 1 is functionwise divided at the upper end into a driving cylinder 2, in which the driving piston 5 is situated, and at the lower end into an apportioning cylinder 3, in which the apportioning piston 6 is situated. At this end, the apportioning cylinder 3 is closed by a screw-on flange 7, in which two bores 8 and 9 are recessed, of which one (9) serves for the delivery of plastics material components from an adjustable variabledisplacement pump 27 through a line 28 to an apportioning chamber 16 and the other (8) serves for the removal thereof from the apportioning chamber 16. Screwed on the upper end of the driving cylinder 2 is an end cover 11 which comprises a bore 10 for the delivery of the pressure medium and a bore for the reception of a control rod 12 which is fitted to the double piston 4. This rod forms part of the piston rod 13 which connects the pistons 5 and 6 and to which the pistons 5 and 6 are secured by means of screw threads. As a result of the pressure medium supplied through the bore 10, the driving piston 5, and its packing 14 is accordingly subjected to a given stress, while the apportioning piston 6 and its packing 15 are subjected to greater stress due to the fact that plastics material components containing abrasive substances are delivered into the apportionitig chamber 16 through the bore 9, while the bore 8 is shut off by a shut-off valve 30, and are subsequently expelled through the bore 8 on account of the driving piston 5 being acted on and the bore 9 being shut off by a shut-off valve 29. According to this embodiment of the invention, this is compensated for in that a screw bushing 17 is screwably, that is to say longitudinally movably arranged on the apportioning piston 6. A packing 15 is provided between the lower face of the screw bushing 17 and a piston collar 18 integral with the piston 6. The sealing effect of the packing 15 can be adjusted by rotation of the screw bushing 17. This is effected without any dismantling of the piston cylinder unit in that a rod-like tool is introduced through an opening 19 in the central wall area of the cylinder 1, which tool engages in a toothing 21 of the screw bushing 17, and the screw bushing 17 is rotated relative to the apportioning piston 6 by means of this tool. During this process, the space 23, which is reduced in size, is ventilated through ventilation holes 24. If necessary, another rod-like tool can be introduced during this adjustment of the packing 15 through a second opening 20, which is arranged above the opening 19, and be placed into a bore 22 or one of several bores 22, thus causing the double piston 4 to be secured against rotation. The screw bushing 17 is guarded against any unintentional rotation during operation by a plastics material ring 26 which serves as a screw thread brake and is inserted in an annular groove 25 of the threaded portion of the screw bushing 17. In the example shown, the openings 19 and 20 are circular and therefore require little space. This is made possible in that the adjustment of the screw bushing 17 is effected in the upper end position of the double piston 4, i.e. in a very specific area of the cylinder 1, and in that the toothing 21 is recessed in the screw bushing 17 over the circumference thereof. WHAT WE CLAIM IS:
1. A piston and cylinder pump for the apportioning of plastics material containing abrasive fillers comprising a piston carried on a piston rod; a cylinder accommodating the piston; a screw bushing screw threaded to the piston; sealing means positioned between the screw bushing and a portion of the piston to seal the piston in the cylinder; a toothing formed on the radially outer surface of the screw bushing; an opening in the wall of the cylinder enabling access to said toothing in one position of the piston in the cylinder, whereby the effectiveness of said sealing means is adjustable by rotation of the screw bushing relative to the piston by means of a tool inserted through said opening in the cylinder wall.
2. A piston and cylinder pump as claimed in claim 1, wherein the toothing of the screw bushing is radially spaced from the inner wall of the cylinder.
3. A piston and cylinder pump as claimed in claim 1 or 2, wherein the opening is provided in the cylinder in such a position as to enable access to the toothing of the screw bushing when the pistonis in an end of stroke position.
4, A piston and cylinder pump as claimed in any one of claims 1 to 3, wherein a second opening is provided in the wall of the cylinder which second opening is adjacent to the first opening, and one more radial bores are provided in the piston or in the piston rod in such a position that access to one of said bores through said second opening is possible when the second piston is in the position where access to the toothing through the first opening is possible.
5. A piston and cylinder pump as claimed in any one of claims 1 to 4, wherein the screw threaded part of the screw bushing there is provided in annular groove, in which there is inserted a rubber or plastics material ring serving as a screw thread brake.
6. A piston and cylinder pump, substan
tially as described herein with reference to and as illustrated by the accompanying drawing.
GB8280/78A 1977-08-11 1978-03-02 Piston cylinder pump Expired GB1573291A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2736177A DE2736177C2 (en) 1977-08-11 1977-08-11 Piston-cylinder unit for dosing a material, in particular containing abrasive fillers

Publications (1)

Publication Number Publication Date
GB1573291A true GB1573291A (en) 1980-08-20

Family

ID=6016132

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8280/78A Expired GB1573291A (en) 1977-08-11 1978-03-02 Piston cylinder pump

Country Status (10)

Country Link
JP (2) JPS5430377A (en)
AU (1) AU519026B2 (en)
BR (1) BR7802887A (en)
DD (1) DD135593A6 (en)
DE (1) DE2736177C2 (en)
ES (1) ES468386A2 (en)
FR (1) FR2400190A2 (en)
GB (1) GB1573291A (en)
IT (1) IT1174287B (en)
SE (1) SE429417B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463919A1 (en) * 1979-08-20 1981-02-27 Forte Dominique Volumetric liq. dispenser dose - has piston in cylinder whose travel is controlled by adjustable stops on rotating shaft
DE3336036A1 (en) * 1983-10-04 1985-04-18 Krauss-Maffei AG, 8000 München PISTON DOSING DEVICE OF A REACTION CASTING MACHINE
FR2797046B1 (en) * 1999-07-30 2001-08-31 Spc France DIFFERENTIAL VOLUMETRIC DOSING DEVICE
CN108671841B (en) * 2017-08-30 2020-11-10 黄河科技学院 Chemical fluid material conditioning device
CN110666980B (en) * 2019-11-12 2021-03-16 浙江远新环保科技有限公司 Dry material injection device for slurry solidification
AT524662B1 (en) * 2021-07-29 2022-08-15 Avl List Gmbh Length-adjustable connecting rod with screw collar

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR711128A (en) * 1930-05-13 1931-09-04 Special plunger for apparatus for lifting liquids such as pumps, etc.
US2711333A (en) * 1951-08-02 1955-06-21 Simpson Rodgers Smith And Hunt Packing adaptors for reciprocable rods
CH348049A (en) * 1958-09-22 1960-07-31 Berthoud & Cie S A Piston pump, especially for liquid sprayer
FR2296505A1 (en) * 1974-12-31 1976-07-30 Chevalier Philippe Pump and head for blending and spraying resin - easy to set up and clean and provide with three wave control valve

Also Published As

Publication number Publication date
IT7848712A0 (en) 1978-04-03
AU3437378A (en) 1979-09-27
JPS5430377A (en) 1979-03-06
DD135593A6 (en) 1979-05-16
SE7805333L (en) 1979-02-12
DE2736177A1 (en) 1979-02-22
JPS60138289A (en) 1985-07-22
FR2400190B2 (en) 1983-10-21
ES468386A2 (en) 1979-04-01
DE2736177C2 (en) 1981-11-19
SE429417B (en) 1983-09-05
AU519026B2 (en) 1981-11-05
IT1174287B (en) 1987-07-01
FR2400190A2 (en) 1979-03-09
BR7802887A (en) 1979-05-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee