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EP-4237306-B1 - SANDING SYSTEM FOR A RAIL VEHICLE

EP4237306B1EP 4237306 B1EP4237306 B1EP 4237306B1EP-4237306-B1

Inventors

  • BÖGE, Ronny
  • MAURER, MICHEL
  • STELZLE, WILFRIED

Dates

Publication Date
20260513
Application Date
20211117

Claims (9)

  1. Grit system for a rail vehicle, having a grit container (1), having a conveying device (2), having a feeding device (3) and having an electric motor (2.1), - wherein the grit container (1) contains a grit (SM) and is connected to the conveying device (2) such that the grit (SM) passes from the grit container (1) into the conveying device (2), - wherein the conveying device (2) is connected to the feeding device (3) such that the grit (SM) passes from the conveying device (2) into the feeding device (3), - wherein the feeding device (3) is designed in such a way that the grit (SM) can be introduced in a targeted manner into a wheel region (R) and/or into a rail region (SCH) of a rail vehicle, - wherein the conveying device (2) comprises a driven conveying worm (2.5) which rotates about a longitudinal axis and by means of which the grit (SM) passes from the grit container (1) into a conveying chamber (2.4), - wherein the conveying worm (2.5) is connected for drive purposes to the electric motor (2.1) in order to set the conveying worm (2.5) in rotation, - wherein the electric motor (2.1) is configured as a steplessly speed-controlled drive, - wherein, to control the rotational speed of the conveying worm (2.5), the electric motor (2.1) is steplessly controlled via a controller of the grit system in such a way - that the rotational speed of the conveying worm (2.5) is changed depending on the grain size of the grit (SM) in order to discharge the grit uniformly and sparingly, - that, for a predetermined grain size of the grit (SM), a delivery amount of the grit (SM) is set by changing the rotational speed, - wherein compressed air can be introduced into the conveying chamber in order to transport the grit from the conveying chamber into the feeding device (3).
  2. Grit system according to Claim 1, wherein the conveying device (2) has an elongate worm chamber (2.2) in which the conveying worm (2.5) is arranged, wherein the worm chamber (2.2) and/or the conveying worm (2.5) are or is oriented horizontally or with an upward or downward inclination from the horizontal plane.
  3. Grit system according to one of the preceding claims, wherein the conveying chamber (2.4) is arranged with a hollow configuration between the conveying device (2) and the feeding device (3) such that the grit (SM), which is conveyed from an inlet zone of the conveying device (2) into an outlet zone of the conveying device (2) over the entire worm chamber (2.2), falls vertically into the conveying chamber (2.4).
  4. Grit system according to Claim 3, wherein the conveying chamber (2.4) is connected to a compressed-air nozzle (2.6) which is preferably arranged in a lateral region of the conveying chamber (2.4).
  5. Grit system according to Claim 4, wherein the compressed-air nozzle (2.6) is controlled in such a way - that, for an active conveying device (2), compressed air catches the grit (SM) falling into the conveying chamber (2.4) and transports it into the feeding device (3), or - that, for an inactive conveying device (2), compressed air is introduced via the conveying chamber (2.4) into the feeding device (3) in order to clean it or in order to dry it.
  6. Grit system according to Claim 1, wherein a transition from the conveying chamber (2.4) to the feeding device (3) is configured as a Venturi nozzle (VT) or as a de Laval nozzle.
  7. Grit system according to one of the preceding claims, wherein the conveying device (2) or the worm chamber (2.2) has preferably at its lowest point an inspection opening (WOE) for cleaning purposes and/or for emptying grit.
  8. Grit system according to Claim 1, wherein the feeding device (3) is designed in such a way that the grit (SM) is introduced in a targeted manner into a wheel-rail gap (RSCHS) of the rail vehicle.
  9. Grit system according to one of the preceding claims, wherein the grit container (1) has at its lowest point a flange with through-opening that is connected to a flange with through-opening of the conveying device (2) and the latter are formed in such a way that the grit (SM) passes directly under the action of gravity into the conveying device (2) or into the worm chamber (2.2) .

Description

The invention relates to a spreading agent system for a rail vehicle. Rail vehicles generally suffer when the rails are wet or covered in leaves, as they have difficulty transferring or converting their full drive or traction power onto the rail. To address this problem, spreading systems are known that contain a spreading agent (for example, quartz sand with a predetermined grain size) and introduce it into a wheel-rail gap as needed and possibly with compressed air assistance in order to increase traction on the rail. It is important to introduce the spreading agent into the wheel-rail gap as homogeneously and sparingly as possible, in order to optimize the traction power transferred to the rail and to use a limited supply of spreading agent and a limited supply of compressed air in a time- and quantity-optimized manner. Spreading systems that require small amounts of compressed air are easy to implement, but only allow for intermittent application of the spreading material. The spreading material is applied to the rail at specific points. More complex spreading systems are also known that combine mechanical metering of the spreading agent with compressed air conveyance of the spreading agent. These allow They feature a stepwise or stepless and speed-dependent spreading agent discharge onto the rail, but have a disadvantage of relatively high compressed air consumption. Another disadvantage of such systems is that the spreading agent is applied in pulsed form. This results in a reduced transfer of traction power to the rail. From the printed materials US 1360627 A , US 1781637 A , GB 328597 A and from CN 107380176 A There are known systems that use a helix or screw to pump or transport sand from a container. It is therefore the object of the present invention to provide a spreading agent system for a rail vehicle which overcomes the above-mentioned disadvantages and at the same time allows an optimized or improved conversion of the traction power of the rail vehicle onto the rail. This problem is solved by the features of claim 1. Advantageous further developments are specified in the dependent claims. The invention relates to a spreading agent system for a rail vehicle comprising a spreading agent container, a conveying device, and a feeding device. The spreading agent container holds a spreading agent and is connected to the conveying device, such that the spreading agent flows from the container into the conveying device. The conveying device is connected to the feeding device, such that the spreading agent flows from the conveying device into the feeding device. The feeding device is designed such that the spreading agent can be applied in a targeted manner to a wheel and/or rail area of the rail vehicle. According to the invention, the conveying device includes a driven screw conveyor rotating about a longitudinal axis, with which the spreading material is conveyed from the spreading material container into a conveying chamber. Compressed air can be introduced into the conveying chamber to transport the spreading material from the conveying chamber to the feeding device. In an advantageous further development, the conveying device has an elongated screw chamber in which the conveying screw is arranged. The screw chamber and/or the conveyor screw is preferably oriented horizontally or inclined upwards or downwards from the horizontal plane in order to transport the spreading material within the conveying device in an optimized manner. According to the invention, the screw conveyor is connected to an electric motor that rotates or sets the screw conveyor in rotation. According to the invention, the electric motor can be continuously controlled to control the rotational speed, preferably by varying the operating voltage or the operating current of the electric motor. This allows the delivery rate of the spreading material to be adjusted for a given particle size of the spreading material by changing the rotation speed. In an advantageous further development, the conveying chamber is arranged between the conveying device and the feeding device, is designed to be hollow and can be introduced into compressed air. The spreading material, which is conveyed from an inlet zone of the conveying device through the entire screw chamber to an outlet zone of the conveying device, preferably falls vertically into the conveying chamber. At the lowest point of the conveying chamber, the introduced compressed air acts on the spreading material, which It is transported into the feeding device with the aid of compressed air. In an advantageous further development, the conveying chamber is connected to a compressed air nozzle in a lateral area. In an advantageous further training, the compressed air is controlled in such a way, that the compressed air in an active conveying device captures the spreading material falling into the conveying chamber and transports it to the feeding device, or that compressed air is introd