DE3126524C2 - Device for scanning the level of solid and liquid substances in containers or conveying elements - Google Patents

Abstract

Device for scanning the level of solid or liquid substances in containers or conveying elements, a rod (2) being suspended from a stand (1), which at its upper end region (3) in a coaxial arrangement has a solid (4) with uniformly convexly curved Has outer surfaces (5) which in turn is inserted into a recess (7) with corresponding surfaces (8) embedded in a carrier (6) and wherein the upper free end (9) of the rod (2) in the rest position is the measuring point of a in the stand (1) used non-contact limit switch (10) covered and alternatively at the lower end of the rod (2) wing elements (12) are attached.

Description

The invention relates to a device for scanning the level of solid or liquid substances in Containers or conveying elements, by means of a sensor designed as a rod and attached to a carrier, the end of which actuates an electrical switch for switching the material feed on or off.

Devices of the aforementioned type are known. So-called capacitive level indicators, A distinction is made between electromotive level indicators and membrane level indicators.

For level indicators operated by an electric motor a synchronous motor drives a rotating vane protruding into the container via a gear. As soon the bulk material reaches the rotary vane, it will be at his Rotation prevented and held. The moment of reaction of the motor is used to interrupt further filling of the silo via a limit switch (DE-OS 25 34 241).

Instead of the rotary wing, a swivel arm can also be provided which extends over a certain height range is constantly moved up and down and due to the rising bulk material in its movement downwards is prevented and thereby triggers a shutdown process for the inlet to the silo (DE-OS 20 35 492).

A disadvantage of these devices is. that there are many constantly moving parts and the sensitive ones Mechanics inevitably leads to a short service life.

The invention is based on the object of a device for scanning the level of solid or liquid substances in containers or conveying elements to develop that safely, with only little moving components and simple construction and little Tax expenditure on reaching the specified fill level exploits this to trigger a shutdown of the inflow.

To solve this problem, the invention provides that the rod is suspended from the carrier and at its upper end in a coaxial arrangement a solid with uniformly convexly curved Has outer surfaces which is inserted movably into a recess let into the carrier, and that the Switch can be operated without contact.

The advantages that can be achieved are that only a low construction and control effort is necessary in order to be able to determine the level in a container or conveying element. It there are only a few moving parts. Their movement takes place only when the fill level is reached and through the bulk material. A good sensitivity with regard to reaching the filling level is due to the free movement in every pendulum direction given.

A preferred embodiment is shown in the drawing shown it shows

F i g. 1 the device according to the invention in side view

2 shows a section along the line H-II, according to

F i g. 3 shows the device according to FIG. 1 in side view, FIG. 4 shows a section along the line IV-IV, according to FIG F i g. 3, and

F i g. 5 possible pendulum movements of the probe rod in a schematic representation.

As can be seen from the figures, the device consists of a stand 1, in which a Rod 2 is suspended The rod 2 is suspended from a support 6 with an embedded recess 7. The rod 2 has at its upper end region 3 in a coaxial arrangement on a solid body 4, which with a uniformly convex curved outer surface 5 is provided. B. a half ball be. The shape of the surfaces 8 of the recess 7 corresponds to the outer surface 5 of the solid body. The upper free end 9 of the rod 2 covers the measuring point of a in the stand 1 in its rest position used non-contact limit switch

10. This limit switch 10 is protected by an upwardly pivotable cover 13 If the pendulum movement of the rod 2 leaves the covered position (see FIG. 5), this triggers a signal which tax or information basis is for switching off the inflow. On the rod 2 can wing elements 12 are also attached to the lower end 11 be. The use of wings 12 is expedient when the device according to the invention is in containers Is used Without a wing, it can be used in vibrating chutes, chutes, belts and crushers.

When using the device according to the invention in hot containers. The rod 2 transmits silos or the like the container via a linkage outside the container. Silos or the like. Articulated element which in turn, for covering the measuring point or not covering the measuring point, also outside of the container, silo or the like. Arranged contactless limit switch is used.

For this purpose 3 sheets of drawings

Claims (1)

Claim: Device for scanning the level of solid or liquid substances in containers or Conveying elements, by means of a sensor designed as a rod, attached to a support, the end of which an electrical switch for switching the material feed on or off is actuated thereby characterized in that the rod (2) is suspended from the carrier (6) and at its upper end region (3) In a coaxial arrangement, a solid body (4) with uniformly convexly curved outer surfaces (5) which is inserted movably into a recess (7) let into the carrier (6), and that the switch can be actuated without contact.