초록 ▼

The machine comprises a device for shifting the track which is controlled by a device for the detection of its geometrical defects. The detection device comprises three rail feelers to which there are connected a light-ray emitter (17), a screen (18) having two parallel delimiting edges (19, 20) and

The machine comprises a device for shifting the track which is controlled by a device for the detection of its geometrical defects. The detection device comprises three rail feelers to which there are connected a light-ray emitter (17), a screen (18) having two parallel delimiting edges (19, 20) and a receiver (21) having two identical photovoltaic cells (22, 23) arranged in such a manner that the sum of their irradiated surfaces (u+d) is a constant and their difference (u-d) is proportional to the displacements of the screen. The signals produced by the two cells are processed in an electronic circuit comprising a totalizer (28) delivering a signal for the control of the displacement device proportional to the said difference (u-d) and a piloting circuit (30, 41, 42) of the emitter to maintain the irradiation of the two cells constant by comparison of a signal proportional to the said sum (u=d) with a reference signal (S 0 ).

대표청구항 ▼

1. A railway work machine comprising railway track displacement tool for correcting levelling and/or alignment defects of the railway track, at least one regulating member for adjusting the displacements of at least one of said tools, and a detection device for the detection of said defects, said de

1. A railway work machine comprising railway track displacement tool for correcting levelling and/or alignment defects of the railway track, at least one regulating member for adjusting the displacements of at least one of said tools, and a detection device for the detection of said defects, said detection device being connected to and controlling said regulating member and comprising, in combination, at least one series of three feelers arranged one behind the other at three spaced points of a line of rails of said railway track and to which there are connected, respectively in order, a point-source of light-rays emitter, a screen which masks off a part of said rays and has at least two parallel delimiting edges spaced apart from each other in the direction of the defect to be corrected, a receiver having at least one group of two photosensitive cell means for emitting electrical signals proportional to their irradiated surfaces and to the intensity of their irradiation, said two cell means having identical dimensions and electrical characteristics and being spaced apart from each other and aligned in a direction perpendicular to said two delimiting edges of the screen, whereby the two projected images of said two delimiting edges of the screen fall each in the middle of one of said two cell means when the axis of symmetry of the two delimitting edges is located in a reference plane defined by said point-source of light-rays and the axis of symmetry of said two cell means, and the difference of the irradiated surfaces of said cell means is proportional to the amplitude of the detected defects, a processing circuit for the signals emitted by said two cell means comprising a first totalizer which delivers a control signal proportional to the difference between the values represented by said signals, which signal is used as a control signal for said regulating member, a second totalizer which delivers a signal proportional to the sum of the values represented by said signals, and a pilot circuit for said emitter comprising a comparator having a first input connected to said second totalizer and a second input connected to a generator of a reference signal representative of an instruction irradiation intensity and the output of which is connected to a feed regulator for said point-source of light-rays of the emitter, whereby the sum of the irradiated surfaces of said two cell means is a constant equal to the surface of one of them and therefore the signal delivered by the second totalizer is only representative of the intesity of irradiation of said two cell means and this intensity is maintained as a constant equal to the instruction intensity, while the value of the control signal is exclusively proportional to the difference of the irradiated surfaces of said two cell means and therefore said value of the control signal may also be used as in indication of the actual amplitude of the detected defects. 2. A railway work machine comprising railway track displacement tools for correcting levelling and/or alignment defects of the railway track, at least one regulating member for adjusting the displacements of at least one of said tools, and a detection device for the detection of said defects, said detection device being connected to and controlling said regulating member and comprising, in combination, at least one series of three feelers arranged one behind the other at three spaced points of a line of rails of said railway track and to which there are connected, respectively in order, a point-source of light-rays emitter, a screen which masks off a part of said rays and has at least two parallel delimiting edges spaced apart from each other in the direction of the defect to be corrected, a receiver having at least one group of two photosensitive cell means for emitting electrical signals proportional to their irradiated surfaces and to the intensity of their irradiation, said two cell means having identical dimensions and electrical characteristics and being spaced apart from each other and aligned in a direction perpendicular to said two delimiting edges of the screen whereby the two projected images of said two delimiting edges of the screen fall each in the middle of one of said two cell means when the axis of symmetry of the two delimiting edges is located in a reference plane defined by said point-source of light-rays and the axis of symmetry of said two cell means, and the difference of the irradiated surfaces of said cell means is proportional to the amplitude of the detected defects, a processing circuit for the signals emitted by said two cell means comprising a totalizer which delivers a control signal proportional to the difference between the values represented by said signals, which control signal is used as a control signal for said regulating member, a third photosensitive cell means located in the field of irradiation of said two cell means which is not influenced by the projected shadow of the screen, a shaping circuit connected to said third cell means and delivering an output signal proportional to the intensity of irradiation of said third cell means, and a pilot circuit for the emitter comprising a comparator having a first input connected to said shaping circuit and a second input connected to a generator of a reference signal representative of an instruction irradiation intensity and the output of which is connected to a feed regulator for said point-source of light-rays of the emitter, whereby the intensity of irradiation of said two cell means of the receiver is maintained as a constant equal to the instruction intensity and therefore the value of the control signal is exclusively proportional to the difference of the irradiated surfaces of said two cell means and said value of the control signal may also be used as an indication of the actual amplitude of the detected defects.