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Laboratory grinder having rotary lead-throughs for grinding beakers to be provided with a medium

A grinder, laboratory technology, used in grain processing, etc., to solve problems such as short service life

Active Publication Date: 2012-03-07
RETSCH GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, however, these hose connections have a short service life due to the greater amplitude of the alternating stress caused by the movement of the grinding cup

Method used

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  • Laboratory grinder having rotary lead-throughs for grinding beakers to be provided with a medium
  • Laboratory grinder having rotary lead-throughs for grinding beakers to be provided with a medium
  • Laboratory grinder having rotary lead-throughs for grinding beakers to be provided with a medium

Examples

Experimental program
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Embodiment Construction

[0025] Such as figure 1 A laboratory grinder 10 , shown only schematically, has a grinding cup 11 , to which a feed line 12 and a return line 13 for feeding the grinding cup 11 with liquid nitrogen are connected. For the movement of the grinding cup 11 , the pipes 12 and 13 are guided via a rotary actuator 14 which has a stationary part 15 and a movable part 16 . The stationary part 15 consists of two parts 15 a , 15 b which enclose the movable part 16 between them and which are held together by a holder, not further shown here, to be connected to the housing of the laboratory grinder 10 . Two holes 17 a and 17 b are formed in the movable part 16 , wherein the hole 17 a is connected at the supply line 12 and the hole 17 b is connected at the return line 13 . The holes 17a and 17b in the movable part 16 of the rotary actuator 14 are respectively bent outwards by 90° and adjoin here at the holes 18a and 18b respectively formed in the stationary parts 15a and 15b, wherein the ho...

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PUM

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Abstract

A laboratory grinder comprises at least one grinding beaker carrying out a rotary movement about the central axis thereof, the grinding beaker being connected to at least one line for conducting a liquid or gaseous medium, is characterized in that the line is guided by way of a rotary lead-through (14) having a stationary part (15) and a moveable part (16) coupled to the movement of the grinding beaker (11), wherein the stationary part (15) comprises at least one connection (118a, 118b) for a stationary line and the moveable part (16) at least one connection (117a, 117b) for a line leading to the grinding beaker (11).

Description

technical field [0001] The invention relates to a laboratory grinder (Labormuehle) with at least one grinding cup (Mahlbecher) which performs a rotational movement about its central axis, wherein the grinding cup is connected to at least one line for conducting a liquid or gaseous medium . Background technique [0002] Such laboratory grinders are known, for example, in the form of vibrating grinders or planetary ball grinders with a gear ratio of 1:1. It is known to date that brittle materials are comminuted particularly effectively in such laboratory grinders, in which case an additional embrittlement of the material to be comminuted is achieved by cooling with liquid nitrogen. For this purpose, liquid nitrogen must be continuously supplied to and removed from the moving grinding cup. In this context, it is known to carry out the feeding of grinding cups with a liquid or gaseous medium, for example nitrogen, by means of correspondingly arranged flexible hoses. The hose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/08B02C17/18
CPCB02C17/08B02C17/14B02C17/186
Inventor S·R·马勒
Owner RETSCH GMBH & CO KG