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Impact device

A technology of impact device and impact mechanism, applied in impact drilling, portable impact tool, driving device for drilling in wellbore, etc., can solve the problem of reducing the throttling effect of guide parts, reducing the bearing capacity of oil film and damaging the efficiency of hydraulic hammer and other problems, to achieve the effect of improving the load-bearing capacity and increasing the service life

Active Publication Date: 2017-08-29
CONSTR TOOLS
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AI Technical Summary

Problems solved by technology

The continuous extension of the bore over its entire axial extent detrimentally reduces the throttling effect of the guide, which leads to high volume leakage and the occurrence of high pressure peaks at the seals
High volume leakage impairs hammer efficiency
[0019] In addition, by making the bore free of a cylindrical zone of constant diameter, the load-bearing capacity of the oil film formed in the void is reduced, which causes the percussion piston to come into contact with the bore and damage and wear the guide surfaces

Method used

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Examples

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Embodiment Construction

[0049] figure 1 and figure 2 The mode of operation of the hydraulic percussion device is shown diagrammatically in . The impact mechanism 3 is hydraulically connected to a pump 4 and a tank 5 of a supporting device (eg an excavator) via a pressure line 1 and a tank line 2, respectively. On the excavator there is a valve to which the line 1 to the pump can be connected in order to supply the impact mechanism with pressurized oil for operation, or this connection can be disconnected in order to stop the operation of the impact mechanism. For greater clarity, this valve is not shown.

[0050]The striking mechanism 3 is formed by a striking mechanism housing, in which a striking piston 6 is guided. The striking mechanism housing can consist of several parts connected by screws, such as a cylinder head, a cylinder and a chisel seat in which the chisel 7 is mounted by means of a bearing bush 8 . Only the simplified inner contour of the receiving opening of the striking mechani...

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Abstract

The invention relates to a percussion device with a percussion mechanism housing having a receiving bore in which a percussion piston is mounted such that the percussion piston is displaceable along a longitudinal axis, wherein in the receptacle bore At least one percussion mechanism guide surface with an inner diameter is formed in and at least one percussion piston guide surface with an outer diameter is formed on the percussion piston. In order to avoid as much as possible radial contact between the percussion piston and the percussion mechanism housing, to reduce the volume of oil leakage via the play of the guide surfaces and to prevent wear on the guide surfaces and on the cams between the seals According to the invention, the striking mechanism guide surface has an inner diameter which increases non-linearly in the axial direction at least in some regions and / or the percussion piston guide surface has an outer diameter which decreases non-linearly in the axial direction.

Description

technical field [0001] The invention relates to a percussion device with a percussion mechanism housing having a receiving bore in which a percussion piston is mounted such that the percussion piston is displaceable along a longitudinal axis, wherein in the receptacle bore At least one percussion mechanism guide surface with an inner diameter is formed in and at least one percussion piston guide surface with an outer diameter is formed on the percussion piston. Background technique [0002] Percussion devices operated by a pressurized medium are used in hydraulic hammers, especially for breaking stone, concrete or other building materials, and drilling hammers in stone and other building materials Drill the hole. In most cases, they are mounted as additional or additional equipment on construction machines, such as eg excavators, loaders, tracked vehicles or other support units, and they are supplied with oil from these machines. [0003] In the case of a hydraulic hammer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25D9/02B25D9/18E21B4/14
CPCB25D9/02B25D9/18B25D2250/231B25D2217/0019B25D2217/0023E21B4/14E21B1/38B25D9/14
Inventor M·梅尔维格U·奥奇巴赫
Owner CONSTR TOOLS
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