WO2002070824A1 - Stampfer mit be- und entlüftungseinrichtung - Google Patents
Stampfer mit be- und entlüftungseinrichtung Download PDFInfo
- Publication number
- WO2002070824A1 WO2002070824A1 PCT/EP2002/002256 EP0202256W WO02070824A1 WO 2002070824 A1 WO2002070824 A1 WO 2002070824A1 EP 0202256 W EP0202256 W EP 0202256W WO 02070824 A1 WO02070824 A1 WO 02070824A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure compensation
- compensation opening
- envelope
- pressure
- tool according
- 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.)
- Ceased
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
- E02D3/061—Tampers with directly acting explosion chambers
Definitions
- the invention relates to a working device, in particular a tamper for soil compaction, according to the preamble of claim 1.
- Such rammers are usually constructed in such a way that an upper mass which receives a motor and a crank mechanism is connected via a spring set to a working mass which essentially forms a ramming plate.
- the crank mechanism converts the rotary movement generated by the motor into an oscillating linear movement, for which purpose a guide piston is guided in a longitudinally movable manner in a guide tube.
- the system for generating the ramming movement which is located between the motor outlet and the ramming plate, is referred to below as the ramming system.
- the ramming system is oil lubricated.
- the ramming system in known rammers is enclosed in the casing, which e.g. can consist of a combination of rigid housing parts and a bellows. So far, the envelope has been designed in such a way that it effects a complete sealing of the ramming system, with the result that pressure compensation between the sealed interior and the atmosphere is not possible.
- the lack of pressure compensation has an adverse effect.
- the ramming system is usually mounted in such a way that the crank assumes the top dead center position, that is to say that the device assumes its minimum overall height in which the upper mass approximates the working mass, or the upper mass assumes its lowest position relative to the working mass.
- the crank mechanism By turning the crank mechanism, the tamper stretches, ie the upper mass is raised relative to the working mass, until finally the tamper has reached its maximum height in the bottom dead center position of the crank mechanism.
- the tamper stroke between the two dead center positions is 60 mm. In order to be able to absorb this relative movement between the upper mass and the working mass, the aforementioned bellows is provided.
- envelope volume increases, and consequently a negative pressure develops in the enclosed area.
- This negative pressure not only makes it difficult to start the device when starting, which can lead to engine death and, for example, increased clutch wear.
- the seals and the bellows are also stressed by the negative pressure that occurs.
- the temperature of the working tool experiences a strong warming due to various causes, which can only be influenced to a minor extent without great effort, namely through solar radiation, frictional heat on the ram longitudinal guide, internal friction of the springs of the ramming system, friction of the bearings and shaft seals, as well Radiant heat from the engine flange and heating through the heated engine cooling air blowing on the crankcase.
- This strong warming is further intensified by the heat loss from the compression work resulting from the constantly changing stroke volume. This also affects the pressure differences that arise in the closed system when there is a greater height difference between the location where the tamper has been installed and its location.
- the invention is therefore based on the object of avoiding the compaction work and the resulting proportion of device heating.
- the envelope surrounding the ramming system is provided with a small pressure equalization opening, the cross-section of which is just sufficient, a pressure equalization between the inside of the envelope, ie the envelope volume, and the To enable environment, preferably the pressure compensation opening is a bore with a diameter of 0.25-0.5 mm.
- the pressure in the ramming system can be neutralized, so that no work to overcome a pressure difference and consequently no resulting heating occurs, while on the other hand the protective function of the casing is largely retained. Because an overpressure or underpressure deviating from the ambient pressure can no longer impair the spring system, the output increases.
- the bellows forming part of the envelope is no longer burdened by overpressure or underpressure, which extends its service life.
- the shaft seal to the drive motor is also less stressed and heats up less, which also benefits the service life.
- the bore can have an angled course or the pressure equalization opening can consist of a labyrinthine channel.
- the oil leakage can preferably also be prevented by connecting a sintered metal filter upstream of the pressure compensation opening.
- a further advantageous embodiment consists in that the pressure compensation opening is arranged in a dimensionally stable area of the casing, whereby it always assumes the same position, but in particular preferably in such a way that the pressure compensation opening in the section of a combustion following an air filter and leading to the internal combustion engine - Air intake line opens.
- This prevents negative pressure by sucking in air from the clean side of the filter, so that no dirt particles can enter the ramming system, while oil that is entrained in the air outlet to prevent overpressure is taken up by the intake air, fed to the internal combustion engine and used with the gasoline. Air mixture is burned so that the pressure compensation opening is absolutely harmless both for the device and for the environment.
- the solution provided according to the invention can be relatively inexpensive realize if, according to a preferred feature, the pressure equalization opening is formed by the nozzle bore of a commercially available carburetor nozzle which is interchangeably inserted into the casing.
- the pressure equalization opening is formed by the nozzle bore of a commercially available carburetor nozzle which is interchangeably inserted into the casing.
- FIG. 1 shows a section through part of the upper mass of a rammer for soil compaction, with an air filter and an air intake duct leading from the air filter to the drive motor, not shown;
- Fig. 2 in an enlarged scale a section through a locking screw with an angled pressure compensation opening and a fastening thread for an air filter.
- the total mass of 10, shown only partially in FIG. 1, of a rammer driven by an internal combustion engine for soil compaction shows a housing part 12 which is part of the envelope of the ramming system.
- This housing part 12 is provided with a threaded bore traversing an eye 14, into which a screw plug 16 is screwed.
- the screw plug 16 is provided with a threaded end 18, to which a collar 20 covering the threaded bore is connected.
- a hexagon 22 is formed, which serves to tighten the locking screw 16 in the threaded bore.
- a threaded bore 24 opens, which is used to fasten an air filter 26 by means of a fastening bolt 28 which passes centrally through the air filter 26.
- the intake air for the internal combustion engine, not shown, crossing the air filter 26 flows through an air intake duct 30 formed on the housing part 12.
- the screw plug 16 contains an eccentric blind bore 34 which is parallel to its threaded axis 32 and which emerges from the threaded end 18 emerges and is thus connected to the space (envelope volume) enclosed by the casing for receiving the tamping system, not shown, when the screw plug 16 assumes its position shown in FIG. 1.
- a connection between the blind bore 34 and the air intake duct 30 or the clean side of the air filter 26 is established through a radial bore 36 that emerges above the collar 20 and serves as a pressure compensation opening.
- the envelope volume describes the ramming system, which changes its length and thus its volume during operation due to the crank mechanism.
- the bore 36 can also be formed by a nozzle bore in a commercially available carburetor nozzle. Then only the carburetor nozzle needs to be replaced if a change or maintenance of the bore is desired.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Road Paving Machines (AREA)
- Road Repair (AREA)
- Soil Working Implements (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP02729947A EP1364090A1 (de) | 2001-03-02 | 2002-03-01 | Stampfer mit be- und entlüftungseinrichtung |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE20103665U DE20103665U1 (de) | 2001-03-02 | 2001-03-02 | Stampfer mit Be- und Entlüftungseinrichtung |
| DE20103665.7 | 2001-03-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2002070824A1 true WO2002070824A1 (de) | 2002-09-12 |
| WO2002070824A8 WO2002070824A8 (de) | 2002-12-27 |
Family
ID=7953751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2002/002256 Ceased WO2002070824A1 (de) | 2001-03-02 | 2002-03-01 | Stampfer mit be- und entlüftungseinrichtung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1364090A1 (de) |
| DE (1) | DE20103665U1 (de) |
| WO (1) | WO2002070824A1 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12065790B2 (en) | 2020-07-07 | 2024-08-20 | Milwaukee Electric Tool Corporation | Plate compactor |
| US12312752B2 (en) | 2020-07-07 | 2025-05-27 | Milwaukee Electric Tool Corporation | Plate compactor |
| US12692673B2 (en) | 2020-07-07 | 2026-07-28 | Milwaukee Electric Tool Corporation | Plate compactor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2218772A1 (de) * | 1972-04-18 | 1973-10-31 | Rilco Maschf | Stampfgeraet |
| DE3439534A1 (de) * | 1984-10-29 | 1986-05-15 | Weber Maschinentechnik Gmbh, 5928 Laasphe | Ruettelstampfer |
-
2001
- 2001-03-02 DE DE20103665U patent/DE20103665U1/de not_active Expired - Lifetime
-
2002
- 2002-03-01 WO PCT/EP2002/002256 patent/WO2002070824A1/de not_active Ceased
- 2002-03-01 EP EP02729947A patent/EP1364090A1/de not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2218772A1 (de) * | 1972-04-18 | 1973-10-31 | Rilco Maschf | Stampfgeraet |
| DE3439534A1 (de) * | 1984-10-29 | 1986-05-15 | Weber Maschinentechnik Gmbh, 5928 Laasphe | Ruettelstampfer |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12065790B2 (en) | 2020-07-07 | 2024-08-20 | Milwaukee Electric Tool Corporation | Plate compactor |
| US12234613B2 (en) | 2020-07-07 | 2025-02-25 | Milwaukee Electric Tool Corporation | Plate compactor |
| US12312752B2 (en) | 2020-07-07 | 2025-05-27 | Milwaukee Electric Tool Corporation | Plate compactor |
| US12692673B2 (en) | 2020-07-07 | 2026-07-28 | Milwaukee Electric Tool Corporation | Plate compactor |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1364090A1 (de) | 2003-11-26 |
| WO2002070824A8 (de) | 2002-12-27 |
| DE20103665U1 (de) | 2001-05-03 |
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