CN216792379U

CN216792379U - Automatic testing arrangement of track circuit response performance

Info

Publication number: CN216792379U
Application number: CN202123246704.1U
Authority: CN
Inventors: 谭莉; 周钊
Original assignee: Sichuan Vocational and Technical College Communications
Current assignee: Sichuan Vocational and Technical College Communications
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-06-21
Anticipated expiration: 2031-12-22

Abstract

The utility model discloses an automatic testing device for track circuit response performance, which relates to the technical field of track detection and adopts the technical scheme that the device comprises the following components: the device comprises a current sensor and a U-shaped fixture, wherein the U-shaped fixture is provided with an electric contact head; the centralized control box is provided with a PLC controller, a variable resistance driving piece, an auxiliary controller, a first comparator, a second comparator, a third comparator and an alarm; the two electric contacts are respectively connected with the two ends of the varistor driving piece; the current sensor is connected with the in-phase input end of the first comparator, the output end of the first comparator is connected with the PLC, and the output end of the PLC is connected with the variable resistance driving piece; the in-phase input ends of the second comparator and the third comparator are connected with the PLC, and the output ends of the second comparator and the third comparator are connected with the auxiliary controller. The utility model can accurately detect the wheel set resistance value of the track relay for realizing the shunt state switching of the track circuit, and automatically compares the wheel set resistance value with the allowable fluctuation interval value of the wheel set resistance value.

Description

Automatic testing arrangement of track circuit response performance

Technical Field

The utility model relates to the technical field of track detection, in particular to an automatic track circuit response performance testing device.

Background

The track circuit is a circuit formed by a steel rail line and steel rail insulation, is used for automatically and continuously detecting whether the section of the line is occupied by rolling stock, and is also used for controlling a signal device or a switch device so as to ensure equipment for driving safety. The whole track system road network is divided into a plurality of block sections according to proper distances, each block section is separated by a track insulation joint to form an independent track circuit, the starting point of each section is provided with a signal machine, when a train enters the block section, the track circuit immediately reacts and transmits the existing train passing in the section and the information of forbidding other trains to enter the signal machine, and the signal machine positioned at the section entrance immediately displays the information of forbidding dangerous barriers.

As shown in fig. 1, a power transmission end and a track relay are respectively arranged at two ends of a track circuit, when the track circuit is occupied by a train, the track circuit is shunted by a wheel set, the resistance of the wheel set is far smaller than that of a coil of the track relay, the current flowing through the track relay is greatly reduced under the action of a current limiter, the track relay falls down to indicate that the track circuit is occupied, and at the moment, the track circuit is in a shunting state. It follows that the switching of the state of the track circuit depends on the response of the track relay, and therefore it is not necessary to detect the magnitude of the track relay in response to the wheel set resistance.

However, the conventional track circuit detection adopts a detection vehicle running on the track to detect, so that on one hand, the problems of large equipment volume, more operators and the like exist, on the other hand, the track circuit detection only can detect whether the track relay can normally respond to the track wheel set resistance, and cannot accurately detect the resistance value which can be actually responded by the track relay. Therefore, how to design an automatic track circuit response performance testing device capable of overcoming the above defects is a problem which is urgently needed to be solved at present.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects in the prior art, the utility model aims to provide an automatic testing device for the response performance of a track circuit, which can accurately detect the wheel set resistance value of a track relay for realizing the shunt state switching of the track circuit, automatically compares the wheel set resistance value with the allowable fluctuation interval value of the wheel set resistance value, realizes the automatic testing of the response performance of the track circuit, and has the advantages of small volume, portability and convenient operation.

The technical purpose of the utility model is realized by the following technical scheme: an automatic testing device for response performance of a track circuit comprises a current sensor and two U-shaped clamps, wherein an electric contact head is arranged on the inner side wall of one opening of each U-shaped clamp;

one of the U-shaped clamps is provided with a centralized control box, and the centralized control box is provided with a PLC (programmable logic controller), a variable resistance driving piece, an auxiliary controller, a first comparator, a second comparator, a third comparator and an alarm;

the two electric contact heads are respectively connected with two ends of the variable resistance driving piece through leads;

the output end of the current sensor is connected with the non-inverting input end of the first comparator, the output end of the first comparator is connected with the input end of the PLC, and the output end of the PLC is connected with the input end of the variable resistance driving piece;

the non-inverting input ends of the second comparator and the third comparator are connected with the output end of the PLC, and the output ends of the second comparator and the third comparator are connected with the input end of the auxiliary controller;

and the output end of the auxiliary controller is connected with the input end of the alarm.

By adopting the technical scheme, the two U-shaped clamps are respectively inserted into the two rails, the electric contact heads are contacted with the rails, and the PLC controller controls the variable-resistance driving piece to operate after being started, so that the rail shunt formed between the two U-shaped clamps simulates different wheel pair resistance values; along with the continuous change of the track shunt resistance, when the track relay is In a switching state, the current sensor detects the current value of the switched circuit, and the first comparator outputs a high level when detecting that the current value is greater than a reference value In 0; at the moment, the PLC controls the variable resistance driving piece to stop running, current values are simultaneously input into the second comparator and the third comparator, if the current values are larger than a reference value In1 and smaller than a reference value In2, the auxiliary controller outputs an early warning signal and the current values transmitted by the PLC except for simultaneously receiving a high level output by the second comparator and a low level output by the third comparator, the wheel set resistance value of the track relay for realizing the shunting state switching of the track circuit can be accurately detected, and the current values are automatically compared with an allowable fluctuation interval value of the wheel set resistance value, so that the automatic test of the response performance of the track circuit is realized, and the whole device is small In size, convenient to carry and convenient to operate.

The utility model is further configured to: the rheostat driving piece comprises a stepping motor and a sliding rheostat;

the slide rod of the slide rheostat is a lead screw, and the slide rod of the slide rheostat is sleeved with the slide block in a thread matching mode;

and an output shaft of the stepping motor is coaxially and fixedly connected with a sliding rod of the slide rheostat.

By adopting the technical scheme, the stepping motor drives the screw rod to rotate after being started, and the sliding block moves along the axial direction of the screw rod to realize the automatic change of the resistance value of the sliding rheostat.

The utility model is further configured to: the side of the slide rheostat close to the low access resistance value is provided with a first trigger switch, and the centralized control box is provided with a first display lamp;

the first trigger switch is connected with the input end of the PLC controller, and the output end of the PLC controller is connected with the input end of the first display lamp.

By adopting the technical scheme, after the sliding block of the sliding rheostat is contacted with the first trigger switch, the PLC controls the first display lamp to be started and lightened, the early warning display of zero resistance or low resistance can be realized, and meanwhile, the limiting stop control is realized.

The utility model is further configured to: a second trigger switch is arranged on the side, close to the high access resistance value, of the slide rheostat, and a second display lamp is arranged on the centralized control box;

the second trigger switch is connected with the input end of the PLC controller, and the output end of the PLC controller is connected with the input end of the second display lamp.

By adopting the technical scheme, after the sliding block of the sliding rheostat is contacted with the second trigger switch, the PLC controls the second display lamp to be started and lightened, the early warning display of the maximum resistance value or the high resistance value can be realized, and meanwhile, the limiting stop control is realized.

The utility model is further configured to: the centralized control box is provided with a power supply starting switch, and the power supply starting switch is electrically connected with the PLC.

Through adopting above-mentioned technical scheme, power starting switch can realize that the PLC controller is opened and close the operation in a flexible way by the manual mode.

The utility model is further configured to: the centralized control box is provided with a starting reset switch which is electrically connected with the PLC.

By adopting the technical scheme, after the reset switch is started, the PLC controller controls the resistance value of the slide rheostat to be adjusted to the initial state of low resistance value or the initial state of high resistance value.

The utility model is further configured to: the centralized control box is provided with a display screen electrically connected with the auxiliary controller.

By adopting the technical scheme, the display screen can display the early warning signal and the detected current value.

The utility model is further configured to: and an arched elastic piece is arranged on the inner side wall of the other opening of the U-shaped fixture.

Through adopting above-mentioned technical scheme, the elasticity that resumes of arch elastic component can make U type fixture and track peg graft firmly.

The utility model is further configured to: the arched elastic piece comprises a fixed plate, a sliding plate and an arched elastic sheet;

one end of the arched elastic sheet is fixedly connected with the inner side wall of the U-shaped fixture, and the other end of the arched elastic sheet is fixedly connected with the sliding plate;

the fixed plate is horizontally provided with a sliding chute for the sliding plate to slide.

Through adopting above-mentioned technical scheme, after the arch shell fragment pressurized, the slide slides along the spout, provides certain buffering space for the deformation of arch shell fragment, has effectively reduced the arch shell fragment and has received the condition that great pressure and damage.

The utility model is further configured to: the outer wall of the U-shaped fixture is provided with at least one handle.

Through adopting above-mentioned technical scheme, utilize the handle for carrying, installation, dismantlement convenient operation of U type fixture.

Compared with the prior art, the utility model has the following beneficial effects:

1. the automatic testing device for the response performance of the track circuit, provided by the utility model, can accurately detect the wheel set resistance value of the track relay for realizing the shunt state switching of the track circuit, and automatically compares the wheel set resistance value with the allowable fluctuation interval value of the wheel set resistance value, so that the automatic testing of the response performance of the track circuit is realized, and the whole device is small in size, convenient to carry and convenient to operate;

2. after a sliding block of the sliding rheostat is contacted with the first trigger switch, the PLC controls the first display lamp to start and light up, so that early warning display of zero resistance value or low resistance value can be realized, and meanwhile, limit stop control is realized; after the sliding block of the sliding rheostat is contacted with the second trigger switch, the PLC controller controls the second display lamp to start and light up, so that the early warning display of the maximum resistance value or the high resistance value can be realized, and meanwhile, the limiting and stopping control is realized;

3. after the arch-shaped elastic piece is pressed, the sliding plate slides along the sliding groove, a certain buffering space is provided for the deformation of the arch-shaped elastic piece, and the condition that the arch-shaped elastic piece is damaged due to larger pressure is effectively reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:

FIG. 1 is a schematic diagram of the operation of a prior art track circuit;

FIG. 2 is a schematic view of the overall structure in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of the surface of a centralized control box in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a varistor driver according to an embodiment of the utility model;

fig. 5 is an overall operation schematic diagram in the embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

101. a current sensor; 102. a U-shaped fixture; 103. a centralized control box; 104. a handle; 105. a fixing plate; 106. a chute; 107. an arched shrapnel; 108. a slide plate; 109. an electrical contact; 201. a display screen; 202. starting a reset switch; 203. a first display lamp; 204. a second display lamp; 205. an alarm; 206. a power supply start switch; 301. a stepping motor; 302. a slide rheostat; 303. a first trigger switch; 304. a second trigger switch; 401. a first comparator; 402. a PLC controller; 403. a second comparator; 404. a third comparator; 405. and an auxiliary controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example (b): an automatic testing device for track circuit response performance, as shown in fig. 2 and 5, comprises a current sensor 101 and two U-shaped fixtures 102, wherein an inner side wall of an opening of the U-shaped fixtures 102 is provided with an electrical contact 109. One of the U-shaped clamps 102 is provided with a centralized control box 103, and the centralized control box 103 is provided with a PLC controller 402, a variable resistance driving member, an auxiliary controller 405, a first comparator 401, a second comparator 403, a third comparator 404 and an alarm 205. The two electrical contacts 109 are connected to the two ends of the varistor driving element respectively through wires. The output end of the current sensor 101 is connected with the non-inverting input end of the first comparator 401, the output end of the first comparator 401 is connected with the input end of the PLC 402, and the output end of the PLC 402 is connected with the input end of the varistor driving element. The non-inverting input ends of the second comparator 403 and the third comparator 404 are both connected with the output end of the PLC controller 402, and the output ends of the second comparator 403 and the third comparator 404 are both connected with the input end of the auxiliary controller 405. An output of the secondary controller 405 is connected to an input of the alarm 205.

The two U-shaped fixtures 102 are respectively inserted into the two tracks, the electric contact heads 109 are in contact with the tracks, and the PLC 402 controls the variable resistance driving piece to operate after being started, so that the track shunt formed between the two U-shaped fixtures 102 simulates different wheel pair resistance values; along with the continuous change of the track shunt resistance, when the track relay is In a switching state, the current sensor 101 detects the current value of the switched circuit, and the first comparator 401 outputs a high level when detecting that the current value is greater than a reference value In 0; at this time, the PLC controller 402 controls the varistor driving element to stop operating, and simultaneously inputs the current value into the second comparator 403 and the third comparator 404, if the current value is greater than the reference value In1 and less than the reference value In2, the auxiliary controller 405 outputs the warning signal and the current value transmitted by the PLC controller 402 except that it simultaneously receives the high level output by the second comparator 403 and the low level output by the third comparator 404, so that the wheel set resistance value for the track relay to realize the switching of the shunt state of the track circuit can be accurately detected, and the current value is automatically compared with the allowable fluctuation interval value of the wheel set resistance value, thereby realizing the automatic test of the response performance of the track circuit.

As shown in fig. 4, the varistor driver includes a stepping motor 301 and a sliding varistor 302. The slide rod of the slide rheostat 302 is a lead screw, and the slide rod of the slide rheostat 302 is sleeved with the slide block in a threaded fit mode. The output shaft of the stepping motor 301 is coaxially and fixedly connected with the slide rod of the slide rheostat 302. After the stepping motor 301 is started, the screw rod is driven to rotate, and the sliding block moves along the axial direction of the screw rod to realize automatic change of the resistance value of the sliding rheostat 302.

As shown in fig. 4 and 5, the sliding rheostat 302 is provided with a first trigger switch 303 near the low access resistance side, and the centralized control box 103 is provided with a first display lamp 203. The first trigger switch 303 is connected to an input terminal of the PLC controller 402, and an output terminal of the PLC controller 402 is connected to an input terminal of the first display lamp 203. After the slider of the sliding rheostat 302 is in contact with the first trigger switch 303, the PLC controller 402 controls the first display lamp 203 to start and light up, so that the early warning display of the zero resistance value or the low resistance value can be realized, and meanwhile, the limit stop control is realized.

As shown in fig. 3-5, the sliding rheostat 302 is provided with a second trigger switch 304 near the high-connection resistance side, and the centralized control box 103 is provided with a second display lamp 204. The second trigger switch 304 is connected to an input terminal of the PLC controller 402, and an output terminal of the PLC controller 402 is connected to an input terminal of the second display lamp 204. After the slider of the sliding rheostat 302 is in contact with the second trigger switch 304, the PLC controller 402 controls the second display lamp 204 to start and light up, so that the early warning display of the maximum resistance value or the high resistance value can be realized, and the limit stop control can be realized.

As shown in fig. 3 and 5, the centralized control box 103 is provided with a power start switch 206, and the power start switch 206 is electrically connected to the PLC controller 402. The power start switch 206 may be manually operable to enable and disable the PLC controller 402.

As shown in fig. 3 and 5, the centralized control box 103 is provided with a start reset switch 202, and the start reset switch 202 is electrically connected to the PLC controller 402. After the start reset switch 202 is turned on, the PLC controller 402 controls the resistance value of the sliding resistor 302 to be adjusted to the initial state of low resistance value or the initial state of high resistance value.

As shown in fig. 3 and 5, the centralized control box 103 is provided with a display screen 201 electrically connected to the auxiliary controller 405. The display screen 201 may display the warning signal and the detected current value.

As shown in fig. 2, the other opening of the U-shaped clamp 102 is provided with an arched elastic member on the inner side wall. The restoring elasticity of the arched elastic piece can enable the U-shaped clamp 102 to be firmly inserted into the rail.

As shown in fig. 2, the arched elastic member includes a fixed plate 105, a sliding plate 108, and an arched elastic piece 107. One end of the arched elastic sheet 107 is fixedly connected with the inner side wall of the U-shaped fixture 102, and the other end is fixedly connected with the sliding plate 108. The fixed plate 105 is horizontally provided with a slide groove 106 for sliding a slide plate 108. After the arc-shaped elastic sheet 107 is pressed, the sliding plate 108 slides along the sliding groove 106, so that a certain buffer space is provided for the deformation of the arc-shaped elastic sheet 107, and the condition that the arc-shaped elastic sheet 107 is damaged by larger pressure is effectively reduced.

As shown in fig. 2, two handles 104 are symmetrically arranged on the outer wall of the U-shaped fixture 102. The handle 104 is used to facilitate the carrying, mounting and dismounting operations of the U-shaped clamp 102.

It should be noted that the first comparator 401, the second comparator 403, and the third comparator 404 may adopt a current comparator or a voltage comparator, and the input value may be an electrical signal or a digital signal after analog-to-digital conversion, which may be replaced according to requirements, and is not limited herein.

The working process comprises the following steps: the two U-shaped fixtures 102 are respectively inserted into the two tracks, the electric contact heads 109 are in contact with the tracks, and the PLC 402 controls the variable resistance driving piece to operate after being started, so that the track shunt formed between the two U-shaped fixtures 102 simulates different wheel pair resistance values; along with the continuous change of the track shunt resistance, when the track relay is In a switching state, the current sensor 101 detects the current value of the switched circuit, and the first comparator 401 outputs a high level when detecting that the current value is greater than a reference value In 0; at this time, the PLC controller 402 controls the varistor driving element to stop operating, and simultaneously inputs the current value into the second comparator 403 and the third comparator 404, if the current value is greater than the reference value In1 and less than the reference value In2, the auxiliary controller 405 outputs the warning signal and the current value transmitted by the PLC controller 402 except that it simultaneously receives the high level output by the second comparator 403 and the low level output by the third comparator 404, so as to accurately detect the wheel set resistance value of the track relay for switching the shunt state of the track circuit, and automatically compares the current value with the allowable fluctuation interval value of the wheel set resistance value, thereby realizing the automatic test of the response performance of the track circuit.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An automatic testing device for response performance of a track circuit is characterized by comprising a current sensor (101) and two U-shaped fixtures (102), wherein an electric contact head (109) is arranged on the inner side wall of one opening of each U-shaped fixture (102);

one U-shaped fixture (102) is provided with a centralized control box (103), and the centralized control box (103) is provided with a PLC (programmable logic controller) controller (402), a variable resistance driving piece, an auxiliary controller (405), a first comparator (401), a second comparator (403), a third comparator (404) and an alarm (205);

the two electric contact heads (109) are respectively connected with two ends of the variable resistance driving piece through leads;

the output end of the current sensor (101) is connected with the non-inverting input end of a first comparator (401), the output end of the first comparator (401) is connected with the input end of a PLC (402), and the output end of the PLC (402) is connected with the input end of a variable resistance driving piece;

the non-inverting input ends of the second comparator (403) and the third comparator (404) are connected with the output end of the PLC controller (402), and the output ends of the second comparator (403) and the third comparator (404) are connected with the input end of the auxiliary controller (405);

the output end of the auxiliary controller (405) is connected with the input end of the alarm (205).

2. The automatic testing device for the track circuit response performance of claim 1, wherein the rheostat driving member comprises a stepping motor (301) and a slide rheostat (302);

the slide rod of the slide rheostat (302) is a lead screw, and the slide rod of the slide rheostat (302) is sleeved with the slide block in a threaded matching manner;

an output shaft of the stepping motor (301) is coaxially and fixedly connected with a sliding rod of the sliding rheostat (302).

3. The automatic track circuit response performance testing device as claimed in claim 2, wherein the slide rheostat (302) is provided with a first trigger switch (303) close to the low access resistance side, and the centralized control box (103) is provided with a first display lamp (203);

the first trigger switch (303) is connected with the input end of the PLC controller (402), and the output end of the PLC controller (402) is connected with the input end of the first display lamp (203).

4. The automatic track circuit response performance testing device as claimed in claim 2, wherein the slide rheostat (302) is provided with a second trigger switch (304) close to the high-connection resistance side, and the centralized control box (103) is provided with a second display lamp (204);

the second trigger switch (304) is connected with the input end of the PLC controller (402), and the output end of the PLC controller (402) is connected with the input end of the second display lamp (204).

5. The automatic track circuit response performance testing device as claimed in claim 2, wherein the centralized control box (103) is provided with a power starting switch (206), and the power starting switch (206) is electrically connected with the PLC (402).

6. The automatic track circuit response performance testing device as claimed in claim 1, wherein the centralized control box (103) is provided with a start reset switch (202), and the start reset switch (202) is electrically connected with the PLC (402).

7. The automatic testing device for the response performance of the track circuit as claimed in claim 1, wherein the centralized control box (103) is provided with a display screen (201) electrically connected with the auxiliary controller (405).

8. The automatic testing device for the response performance of the track circuit as claimed in claim 1, wherein the inner side wall of the other opening of the U-shaped fixture (102) is provided with an arched elastic member.

9. The automatic testing device for the response performance of the track circuit according to claim 8, wherein the arched elastic member comprises a fixing plate (105), a sliding plate (108) and an arched elastic sheet (107);

one end of the arched elastic sheet (107) is fixedly connected with the inner side wall of the U-shaped fixture (102), and the other end of the arched elastic sheet is fixedly connected with the sliding plate (108);

the fixed plate (105) is horizontally provided with a sliding chute (106) for the sliding plate (108) to slide.

10. The automatic testing device for the response performance of the track circuit according to claim 1, wherein the outer wall of the U-shaped fixture (102) is provided with at least one handle (104).