Railways – Car yard – Track brake
Reexamination Certificate
1998-08-06
2001-02-06
Morano, S. Joseph (Department: 3617)
Railways
Car yard
Track brake
C188S281000, C188S282700, C188S282800, C267S064120
Reexamination Certificate
active
06182575
ABSTRACT:
FIELD OF INVENTION
The invention relates to adjustable stop-wagon retarders with locking function for wagons at high speed and disposal methods thereof, which are suitable for railway marshaling yards or rail lines where it is required to prevent wagons from running away, and more particularly, to adjustable stop-wagon retarders which are hydraulic equipment of no external energy source, mounted on the track to automatically regulate wagon's speed and disposal methods of such equipment.
BACKGROUND OF INVENTION
A multifunctional stop-wagon retarder for railway wagon is disclosed in Chinese Pat. No. ZL92232912.5. This retarder can reduce the speed of a wagon, stop a wagon, or prevent a stalled wagon from running away. And it will do work on a wagon at low speed, and be locked by a wagon at high speed. However, the retarder has disadvantages. The structure of its uni-directional return unit makes the normal returning speed of sliding cylinder unadjustable and therefore, the retarder can not have different control levels. The term “control level” means the time necessary for the sliding cylinder of the stop-wagon retarder to return to its original position after it is deflected downwards by a wheel of the wagon. It's locking control valve can not regulate the locking speed and different thresholds for controlling the locking speed can not be set. The connection mode of the positioning unit is complicated and its components are liable to come off, which affects locking precision. And the exhaust hole located rather low in the housing harms its water prevention performance. In addition, existing disposal method for stop-wagon retarders adopts centralized method to dispose large retarder group which can not achieve good retardation on wagons.
SUMMARY OF INVENTION
Accordingly, the first object of the present invention is to provide an adjustable stop-wagon retarder with locking function for a wagon at high speed, which can overcome the above shortcomings of the prior art and can adjust the returning speed and the locking speed of the stop-wagon retarder and therefore, can realize different control levels and thresholds, achieve reliable control and be effective in protecting from water harm.
The second object of the present invention is to provide an optimized disposal method of stop-wagon retarders.
According to the first aspect of the invention, there is provided an adjustable stop-wagon retarder with locking function for a wagon at high speed including a sliding cylinder assembly and a housing assembly having an exhaust unit, the sliding cylinder assembly comprising a cylinder; a piston slidably housed in said cylinder and dividing the cylinder into an upper chamber and a lower chamber; a pressure valve and a locking control valve both disposed coaxially with said piston; an unlocking unit; at least one uni-directional return unit installed on the piston and a sealing gland mounted on the lower end of the cylinder; said sliding cylinder assembly being charged with hydraulic oil and nitrogen and can longitudinally reciprocate between an upper position and a lower position, a portion of said sliding cylinder being disposed in the path of a wheel of said wagon, and said portion when engaged, directly or indirectly, by a wheel being deflected by, and out of the path of, said wheel to permit the wheel to pass the retarder, said uni-directional unit comprises a sealing valve plate and at least one adjustable throttle valve, the sealing valve plate and a pressure valve seat being mounted coaxially on the upper part of the piston with an adjustable gap between the valve plate and the valve seat, and the adjustable throttle valve being disposed under the valve plate for controlling the speed of the hydraulic oil returning to the upper chamber from the lower chamber of the cylinder; said locking control valve comprises a switch valve and at least one positioning unit, said control valve being disposed around the position between the head of the piston and the sealing gland and rotable between an unlock position in which at least one flowing orifice on the switch valve is aligned with the adjustable throttle valve and a lock position in which the flowing orifice is displaced from the adjustable throttle valve, said unlock position and said lock position being limited by at least one positioning unit; the switch valve comprising at least one locking oblique, an unlocking oblique, the flowing orifice and a leaking orifice, the locking oblique being impacted by the hydraulic oil from a piston outlet so that the switch valve rotates in one direction towards the lock position when the wagon travels at a speed higher than a predetermined value; the leaking orifice being aligned with the adjustable valve in the lock position so that the hydraulic oil can slowly return to the upper chamber from the lower chamber, and therefore, the cylinder can slowly return to its upper position; and the unlocking oblique cooperating with said unlocking unit so that the switch valve rotates in a direction opposite said one direction towards the unlock position.
Preferably, the outlet of said exhaust unit is disposed at a high position so as to prevent water from entering the retarder.
In the adjustable stop-wagon retarder with locking function for a wagon at high speed, the adjustable throttle valve can comprise a step-shaped throttle orifice having coaxially a larger diameter upper section and a smaller diameter lower section, and therefore a shoulder being formed therebetween.
The adjustable throttle valve can further comprise a steel ball disposed on the shoulder in the step-shaped orifice.
A compression spring can be disposed in the throttle orifice between the steel ball and the sealing valve plate, biasing the steel ball towards the shoulder.
In the adjustable stop-wagon retarder with locking function for a wagon at high speed, the positioning unit can comprise a positioning lock disposed in the switch valve and two positioning recesses disposed in the piston. The positioning lock comprises a spring seat fixed in a radial orifice in the switch valve; a steel ball installed in the radial orifice and a compression spring disposed in the radial orifice between the steel ball and the bottom of the spring seat, biasing the steel ball so as to engage with one of the recesses in said unlock position and engage with the other of the recesses in said lock position.
In the uni-directional return unit of the stop-wagon retarder according to the present invention, the returning speed can be regulated and different control levels can be achieved by adjusting the gap between the valve plate and pressure valve seat or the diameter of the throttle orifice, or by increasing or decreasing the number of the adjustable throttle valves.
In the locking control valve of the stop-wagon retarder according to the present invention, the locking speed can be regulated by changing the locking force between the positioning lock and positioning recess, increasing or decreasing the number of the positioning units and therefore, different thresholds can be set as required.
According to the second aspect of the invention, there is provided a method for disposing stop-wagon retarders, especially the adjustable stop-wagon retarders with locking function for a wagon at high speed according to the present invention, characterized in that, in at least one section of the track along which stop-wagon retarders are disposed, the distances between every two adjacent stop-wagon retarders correspond to the distances between every two adjacent wheel axles.
It is preferable that two sections, in which the distances between every two adjacent stop-wagon retarders correspond to the distances between every two adjacent wheel axles, are arranged respectively as the entrance section and the exit section of said track along which stop-wagon retarders are disposed, and in the central section between the entrance section and the exit section, stop-wagons retarders are disposed intensively.
A small group of protective stop-wagon retarders can be disposed
Chang Peiwen
Liu Yongting
Wang Lining
Wang Mingzhu
Wang Qian
China TDJ System Research Centre
Jules Frantz
Morano S. Joseph
Senniger Powers Leavitt & Roedel
LandOfFree
Adjustable stop-wagon retarders with locking function for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adjustable stop-wagon retarders with locking function for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adjustable stop-wagon retarders with locking function for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2611480