DE9416657U1 - Retrofittable spring-loaded plane end stop - Google Patents

Description

RETROFITABLE SPRING-LOADED PLANING END STOP

The invention relates to a subsequently installable spring-loaded end stop for a mining planer (1) in a longwall operation of underground hard coal mining.

The mining planers used today in hard coal mining are guided on the existing longwall chain scraper conveyor (10). The drives of the mining planer are located at both ends near the drives of the chain scraper conveyor. The planing path between the drives is approx. 150 to 350 m. The planer is moved along the longwall chain scraper conveyor (10) using an endless steel link chain (11) that is guided and deflected by chain stars on the planer drives (8). The planer moves at one or two speeds depending on the mining process. The mining planer (9) is braked in front of the planer drives and accelerated again in the opposite direction. It can happen that the planer brakes too late and hits the drive. For this purpose, the drives of the mining planer are equipped with an end stop (3). These end stops are mostly unsprung and unbuffered. The unsprung or unbuffered collision of the mining planer (9) with the drives generates relatively high tensile stresses in the endless chain, which leads to chain breakage and thus to downtimes in coal mining. In addition to production losses, there is increased chain wear.

In contrast, the invention is based on the object of preventing the collision of the planer with the planing end stop (3) of the

drive frame by means of a dampened stop (1) in order to reduce chain breakage. This task is accomplished by a spring-loaded end stop that is subsequently mounted on the existing unsprung end stop (3).

(1) is achieved. The device is characterized by the features of claim 1.

The inventive subsequently attachable spring-loaded end stop (1) consists in principle of a steel housing (4) in which there is a friction spring (2) which converts a large part of the kinetic energy of the mining planer into thermal energy or deformation energy by pushing the spring together. After pushing in the friction spring

(2) it returns to its original shape, i.e. it extends when the planer leaves the end stop. The subsequently attachable spring-loaded planer end stop (1) protrudes over the existing unsprung stop (3) or is placed in front of it. As a result, the planer always collides first with the subsequently attached spring-loaded end stop (1). Two end stops are required per extraction drive.

The advantage of this invention lies in the later retrofitting of planing operations already in use underground. By appropriately redesigning the steel structure (4) enclosing the spring, including the required connecting elements (6) and (7), it is possible to subsequently adapt such a spring-loaded end stop (1) for various planing systems in use, regardless of manufacturer and type.

The spring-loaded end stop (1) does not need to be

It does not need to be serviced, but is replaced on a regular basis, whereby the replaced spring-loaded planing end stop can be serviced in a workshop over days.

The object of the invention is shown in Fig. 1, Fig. 2 and Fig. 3.

Fig. 1 shows an existing planing end stop (3) onto which a subsequently installed spring-loaded planing end stop (1) has been placed. The spring travel is shown here as 90 mm as an example. The friction spring (2) is located in the housing (4) of the subsequently installed spring-loaded planing end stop (1).

Fig. 2 shows the section "X" of Fig. 1 with the planing end guide (5), the subsequently attachable spring-loaded planing end stop (1) and the fastening elements (6) and (7) required for this planing system design.

Fig. 3 shows the floor plan of a longwall operation with the two planer drives (8), the position of the planer end stops (3) and the guide of the extraction planer (9) on the longwall chain scraper conveyor (10).

LIST OF REFERENCE SYMBOLS

1 Retrofittable spring-loaded planing end stop

2 Friction spring

3 End stop

4 Steel housing of the subsequently installable spring-loaded planing end stop

5 Planing guide

6 Fastening element of the subsequently attachable spring-loaded planing end stop

7 Fastening element of the subsequently attachable spring-loaded planing end stop

8 Planer drive

9 Extraction planer

Longwall chain conveyor steel link chain

Claims (3)

PROTECTION CLAIMS 1. Subsequently installable spring-loaded planing end stop, characterized in that the compact construction, consisting of a cylindrical steel housing in which a pre-tensioned spring package is located, allows mounting on the existing rigid planing end stop, which is located on the planing end guide, with the aid of the fastening elements (6) and (7) is possible. 2. Subsequently installable spring-loaded planing end stop according to claim 1, characterized in that the fastening elements can be adapted to the various types of existing rigid planing end stops, for example by moving the fastening bolts (6) or by redesigning the guide shoes (7), without the actual construction and function of the subsequently installable spring-loaded planing end stop having to be changed. 3. Subsequently installable spring-loaded planing end stop according to claims 1 and 2, characterized in that the spring effect is achieved by friction springs (2).