JP7045261B2 - Hand brake non-release detection unit and freight car equipped with it - Google Patents

Description

The present invention relates to a hand brake instability detection unit provided as a return spring in the hand brake mechanism of a freight car of a freight train, and a freight car provided therewith.

Patent Document 1 discloses a freight train in which a handbrake mechanism is provided for each freight car towed by a locomotive. Before departure, it is necessary to check whether the hand brake mechanism is completely loosened, but the current situation is that all workers visually check it, and the hand brake mechanism is not working due to the worker's omission of confirmation. The vehicle may depart in a relaxed state.

Therefore, in Patent Document 2, an IC tag recording the trolley identification information is attached to the side surface of the trolley, and a shutter that opens and closes in conjunction with the hand brake mechanism between the state where the IC tag is covered and the state where the IC tag is exposed is provided. A method has been proposed in which the operating state of the hand brake mechanism is determined by providing the hand brake mechanism on the bogie so that the shutter closes when the hand brake mechanism is not loosened and the bogie identification information of the IC tag cannot be read. Further, Patent Document 3 proposes a method of determining the operating state of the hand brake mechanism by providing a limit switch facing the operating lever of the hand brake mechanism and detecting the operation of the operating lever by the limit switch. .. Further, Patent Document 4 proposes a method of determining the operating state of the hand brake mechanism by interposing a monitoring device with a load sensor in a part of the chain of the hand brake mechanism.

Japanese Unexamined Patent Publication No. 2002-37067 Japanese Unexamined Patent Publication No. 2011-63115 Japanese Unexamined Patent Publication No. 2011-131847 U.S. Pat. No. 9026281

However, if the brake shoe wears due to long-term use, or if the wheel diameter decreases and the gap between the brake shoe and the wheel tread widens, the gap between the brake shoe and the wheel tread will return to its original size. Maintenance may be performed to adjust the reference position of the handbrake mechanism. In the case of the configurations of Patent Documents 2 and 3, if such maintenance is performed, the reference position for detecting the operating state of the hand brake mechanism may shift and the operating state of the hand brake mechanism may not be accurately determined. .. Further, in the case of the configuration using the load sensor as in Patent Document 4, it is necessary to use a robust load sensor that can withstand a large tensile force due to the operation of the hand brake mechanism, which causes a problem of cost increase.

Therefore, an object of the present invention is to provide a configuration capable of accurately detecting the operating state of the hand brake mechanism at low cost regardless of the maintenance of the hand brake mechanism.

The hand brake non-release detection unit according to one aspect of the present invention is a hand brake non-release detection unit provided as a return spring in the hand brake mechanism of a freight car of a freight train, and is connected to a first spring and the first spring. The piston unit is provided, and the sensor provided in the piston unit is provided. The piston unit includes a second spring, a first member that supports one end of the second spring, and a second portion that supports the other end of the second spring and is detected by the sensor. It has a member and. The first member or the second member is connected to the first spring. The first member and the second member are attached to each other in the expansion / contraction direction of the second spring between a detection position where the sensor detects the detected portion and a non-detection position where the sensor does not detect the detected portion. Relative displacement is possible.

According to the above configuration, in the state where the hand brake mechanism is not operating (relaxed state), the first member and the second member are in the non-detection position due to the urging force of the second spring, so that the sensor detects the detected portion. By not doing so, it can be judged that the patient is in a relaxed state. On the other hand, in the state where the hand brake mechanism is activated (non-relaxed state), the first member and the second member are relatively displaced to the detection position due to the tensile force from the first spring due to the operation of the hand brake mechanism, so that the sensor is detected. By detecting the part, it can be determined that the vehicle is in an inflexible state. That is, since the expansion / contraction operation of the second spring in the piston unit due to the operation of the hand brake mechanism by the worker is detected, the hand brake mechanism operates even if the reference position of the hand brake mechanism changes due to maintenance. The state can be detected accurately. Further, since the sensor does not detect the load but detects the position change of the detected portion due to the relative displacement of the first member and the second member, it is necessary to make a robust sensor that can withstand the brake load. It is possible to suppress the cost increase.

The hand brake non-relaxation detection unit according to another aspect of the present invention is a hand brake non-release detection unit provided in a part of the chain of the hand brake mechanism of a freight car of a freight train, and is provided on the piston unit and the piston unit. It is equipped with a sensor. The piston unit has a spring, a first member that supports one end of the spring, and a second member that supports the other end of the spring and includes a detected portion detected by the sensor. The first member and the second member are displaced relative to each other in the expansion / contraction direction of the spring between a detection position where the sensor detects the detected portion and a non-detection position where the sensor does not detect the detected portion. It is possible. The sensor is a proximity switch that does not consume power when the detected portion is not detected and consumes power when the detected portion is detected. The first member and the second member are located at the non-detection position when the hand brake mechanism is in the relaxed state, and are located at the detection position when the hand brake mechanism is in the non-relaxed state.

According to the above configuration, in the state where the hand brake mechanism is not operating (relaxed state), the first member and the second member are in the non-detection position due to the urging force of the spring, so that the sensor does not detect the detected portion. It can be judged that it is in a relaxed state. On the other hand, in the state where the hand brake mechanism is activated (non-relaxed state), the first member and the second member are relatively displaced to the detection position due to the tensile force generated by the operation of the hand brake mechanism, so that the sensor detects the detected portion. It can be judged that it is in an inflexible state. That is, since the expansion and contraction operation of the spring in the piston unit caused by the operation of the hand brake mechanism by the worker is detected, the operating state of the hand brake mechanism is accurate even if the reference position of the hand brake mechanism changes due to maintenance. Can be detected. Further, since the sensor is a proximity switch that does not detect the load but detects the position change of the detected portion due to the relative displacement of the first member and the second member, it is necessary to make a robust sensor that can withstand the brake load. It is possible to suppress the cost increase. In addition, since the handbrake mechanism usually takes a longer time in the loose state than in the non-relaxed state, the sensor (proximity switch) does not consume power when the handbrake mechanism is in the loose state. By configuring the sensor (proximity switch) to consume power when the handbrake mechanism is in an inactive state, power consumption can be suppressed.

According to the present invention, it is possible to provide a configuration capable of accurately detecting the operating state of the hand brake mechanism at low cost regardless of the maintenance of the hand brake mechanism.

It is a schematic diagram of the hand brake instability detection system of the freight train which concerns on 1st Embodiment. It is a block diagram of the hand brake non-relaxation detection system shown in FIG. It is a schematic diagram of the hand brake mechanism shown in FIG. (A) is a cross-sectional view of a hand brake instability detection unit provided in the hand brake mechanism shown in FIG. 3, and (B) is a cross-sectional view illustrating the operation thereof. It is a graph which shows the change of the spring constant of the hand brake instability detection unit shown in FIG. 4A. It is sectional drawing of the hand brake instability detection unit which concerns on 1st modification. It is sectional drawing of the hand brake instability detection unit which concerns on 2nd modification. It is sectional drawing of the hand brake instability detection unit which concerns on 2nd Embodiment.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a schematic diagram of a hand brake incompleteness detection system 10 for a freight train according to the first embodiment. FIG. 2 is a block diagram of the hand brake instability detection system 10 shown in FIG. As shown in FIG. 1, in the present embodiment, the freight train 1 includes a locomotive 2 and a plurality of freight cars 3A to C connected to the locomotive 2. In the area B, in addition to the freight cars 3A to C of the freight train 1 starting from the area B, other freight cars 4A to C detained in the area B without being connected to the locomotive 2 are also arranged. There is. All freight cars 3A to C and 4A to C are equipped with a hand brake mechanism 7 that mechanically presses a brake shoe (not shown) against the tread of the wheel in conjunction with the manual operation of the operator. Here, the area B is, for example, a detention line, a cargo handling line, a freight train for structuring and shunting freight trains, a freight station for loading and unloading freight cars, and the like.

The hand brake non-relaxation detection system 10 automatically detects whether or not the hand brake mechanism 7 mounted on the freight cars 3A to 3C of the freight train 1 starting from the area B is in an inflexible state. .. The hand brake non-relaxation detection system 10 includes a plurality of individual units 11, a ground unit 12, and a status notification device 13. Each individual unit 11 is provided in each of the freight cars 3A to C and 4A to C, respectively. The ground unit 12 is provided in the vicinity of the departure line R in the area B. For example, the ground unit 12 is arranged on the side of the departure line R in the vicinity of the exit of the area B.

As shown in FIGS. 1 and 2, the individual unit 11 includes a hand brake non-relaxation detection unit 21, an individual wireless communication device 22, and an RFID tag 23. The individual wireless communication device 22 transmits the brake operation state detected by the hand brake inactivation detection unit 21 in association with the freight car ID by a medium-distance communication method in which the entire area B can be used as the communication area. That is, the individual wireless communication device 22 stores the freight car ID. As a communication method of the individual wireless communication device 22, for example, an LPWA (Low Power Wide Area) capable of bidirectional communication can be used.

The RFID tag 23 transmits the freight car ID by the RFID system, which is a short-range wireless system having a narrower communication area than the communication system of the individual wireless communication device 22. That is, the RFID tag 23 stores the freight car ID. The freight car IDs stored in the individual wireless communication device 22 and the RFID tag 23 are ID information that can distinguish the freight cars 3A to C and 4A to C. The freight car ID makes it possible to distinguish the hand brake mechanism 7 to which the individual wireless communication device 22 and the RFID tag 23 are attached from the freight cars 3A to C and 4A to C from the other hand brake mechanisms 7.

The ground unit 12 includes a host wireless communication device 31, an RFID reader 32, and an arithmetic processing unit 33. The host wireless communication device 31 receives the brake operation state and the freight car ID from the individual wireless communication device 22 in a medium-range wireless system. Therefore, the host wireless communication device 31 receives the brake operation state and the freight car ID of all the freight cars 3A to C and 4A to C detained in the area B within the communication range by the medium-range wireless method.

The RFID reader 32 receives the freight car ID from the RFID tag 23 by the RFID method. The arithmetic processing unit 33 includes a processor, a volatile memory, a non-volatile memory, an I / O interface, and the like. The arithmetic processing unit 33 functionally has a storage unit 42 (storage unit) and an arithmetic unit 43 (arithmetic unit). Input / output to and from the arithmetic processing unit 33 is realized by an I / O interface. The storage unit 42 is realized by a volatile memory and a non-volatile memory. The arithmetic unit 43 is realized by the processor performing arithmetic processing using the volatile memory based on the program stored in the non-volatile memory.

A plurality of brake operation states received by the host wireless communication device 31 of the ground unit 12 are input to the arithmetic processing unit 33 from each individual wireless communication device 22 of the plurality of individual units 11. The storage unit 42 stores a plurality of brake operation states input to the arithmetic processing unit 33 in association with the freight car ID. The calculation unit 43 extracts the brake operation state associated with the freight car ID that matches the freight car ID received by the RFID reader 32 from among the plurality of brake operation states stored in the storage unit 42. The arithmetic processing device 33 transmits the brake operation state and the freight car ID extracted by the arithmetic unit 43 to the status notification device 13 via the host wireless communication device 31 and the leading car wireless communication device 14.

The status notification device 13 is provided in the locomotive 2 (leading car) of the freight train 1, for example, in the cab 2a of the locomotive 2. The status notification device 13 includes a processor, a volatile memory, a non-volatile memory, an I / O interface, and the like. The status notification device 13 is extracted by the calculation unit 43, and when the brake operating state received via the host radio communication device 31 and the leading car radio communication device 14 is in the inflexible state, the state notification device 13 issues an inflexibility alarm in association with the freight car ID. Notice. The status notification device 13 is extracted by the calculation unit 43, and if the brake operating state received via the host wireless communication device 31 and the leading vehicle wireless communication device 14 is in the relaxed state, it is normal without notifying the alarm. Is displayed.

The hand brake non-relaxation detection system 10 further includes a leading car wireless communication device 14 and a leading car RFID tag 15. The leading car wireless communication device 14 and the leading car RFID tag 15 are mounted on the locomotive 2. The leading car wireless communication device 14 communicates with the host wireless communication device 31 by a medium-range communication method (first wireless method). The first car RFID tag 15 stores the first car ID, and transmits the first car ID by the RFID method. The first car ID is ID information different from the freight car ID.

When the RFID reader 32 receives the leading car ID from the leading car RFID tag 15 by the RFID method, the host wireless communication device 31 requests the individual wireless communication device 22 to transmit the brake operation state in association with the freight car ID. The request signal is transmitted by the medium-range wireless method. That is, the individual wireless communication device 22 transmits the brake operation state detected by the hand brake inactivation detection unit 21 in association with the freight car ID, triggered by the reception of the request signal.

FIG. 3 is a schematic view of the hand brake mechanism 7 shown in FIG. As shown in FIG. 3, the hand brake mechanism 7 is connected to the brake shoe 50 facing the tread surface of the wheel W via the rod 51, and is swingable with respect to the frame 52 of the freight car via the rotation shaft 53. The swing arm 54 connected to the swing arm 54, the chain 55 connected to the swing arm 54, the handle device 56 capable of winding the chain 55, and the hand brake non-relaxation detection unit connecting the swing arm 54 to the frame 52. 21 and.

The hand brake non-release detection unit 21 is provided as a return spring that resists the movement of the swing arm 54 due to the winding of the chain 55. The hand brake non-release detection unit 21 is provided in the first spring 61 connected to the swing arm 54, the piston unit 62 interposed between the first spring 61 and the frame 52, and the piston unit 62. A sensor 63 is provided.

4 (A) is a cross-sectional view of the hand brake instability detection unit 21 provided in the hand brake mechanism 7 shown in FIG. 3, and FIG. 4 (B) is a cross-sectional view illustrating the operation thereof. FIG. 4 (A) shows the hand brake non-relaxation detection unit 21 in a relaxed state in which the chain 55 is not wound by the handle device 56 (see FIG. 3) and the brake shoe 50 is completely separated from the tread surface of the wheel W. show. As described above, the hand brake non-release detection unit 21 includes a first spring 61, a piston unit 62, and a sensor 63.

The piston unit 62 has a second spring 70, a cylinder 71 (first member) that supports one end of the second spring 70, and the other end of the second spring 70 that is reciprocally inserted into the cylinder 71. It has a supporting piston 72 (second member). The expansion / contraction direction of the second spring 70 and the reciprocating direction of the piston 72 coincide with the expansion / contraction direction of the first spring 61.

The cylinder 71 is divided into a bottomed cylindrical cylinder main body 71a, a spring connecting portion 71b provided at one end of the cylinder main body 71a, and an internal space of the cylinder main body 71a into a spring chamber S1 and a detection chamber S2. As described above, it has a stopper portion 71c protruding from the inner peripheral surface of the cylinder main body portion 71a. The other end of the first spring 61, one end of which is connected to the swing arm 54, is connected to the spring connecting portion 71b of the cylinder body 71a.

The piston 72 detects a shaft portion 72a that penetrates the end wall portion of the cylinder body portion 71a on the frame 52 side and the stopper portion 71c, and a first flange portion 72b that protrudes radially from the shaft portion 72a in the spring chamber S1. The chamber S2 has a second flange portion 72c protruding radially from the shaft portion 72a. The second spring 70 is sandwiched between the end wall portion of the cylinder body portion 71a and the first flange portion 72b of the piston 72 in the spring chamber S1 of the cylinder 71.

A detected portion 73 detected by the sensor 63 is provided on the radially outer portion of the second flange portion 72c of the piston 72. In the present embodiment, the detected portion 73 is a magnet, and the sensor 63 is a proximity switch. More preferably, the sensor 63 is a proximity switch that does not consume power in a state where the detected unit 73 is not detected and consumes power in a state where the detected unit 73 is detected. The detection unit 63a of the sensor 63 penetrates the cylinder main body 71a and is exposed to the detection chamber S2. The detection unit 63a of the sensor 63 faces the region of the detection chamber S2 on the stopper unit 71c side.

When the hand brake mechanism 7 is in the loosened state, the first flange portion 72b of the piston 72 is pressed against the stopper portion 71c by the second spring 70, and the second flange portion 72c of the piston 72 is not on the first spring 61 side of the detection chamber S2. It is placed at the detection position. That is, in this state, the detected unit 73 of the piston 72 does not face the detection unit 63a of the sensor 63, and the sensor 63 does not detect the detected unit 73. As described above, when the sensor 63 does not detect the detected portion 73, the hand brake mechanism 7 is in a relaxed state.

As shown in FIG. 4B, when the hand brake mechanism 7 is in an inactive state, the first spring 61 is pulled and extended by the swinging arm 54 (see FIG. 3), and the piston unit 62 is extended. do. When the cylinder 71 is pulled away from the frame 52 by the first spring 61, the second spring 70 is compressed and the second flange portion 72c of the piston 72 moves toward the stopper portion 71c and comes into contact with the stopper portion 71c. Stop. In this state, the detected portion 73 of the piston 72 faces the sensor 63, and the sensor 63 detects the detected portion 73.

That is, the cylinder 71 and the piston 72 are displaced relative to each other in the expansion / contraction direction of the second spring 70 between the detection position where the sensor 63 detects the detected portion 73 and the non-detection position where the sensor 63 does not detect the detected portion 73. It is possible, and the stopper portion 71c of the cylinder 71 limits the relative displaceable range of the piston 72 to the range between the detection position and the non-detection position. When the sensor 63 detects the detected portion 73, the hand brake mechanism 7 is in an inactive state.

The sensor 63 is a contact-type proximity switch, and the detected unit 73 is located at the non-detected position when the hand brake mechanism 7 is in the loosened state, and the detected unit 73 is detected when the hand brake mechanism 7 is in the non-relaxed state. 73 is located at the detection position. Then, since the handbrake mechanism 7 usually takes a longer time in the loose state than in the non-relaxed state, the sensor 63 does not consume power when the handbrake mechanism 7 is in the loose state. The sensor 63 consumes power when the handbrake mechanism 7 is in the relaxed state, and the power consumption is suppressed.

Further, it is preferable that the spring constant of the second spring 70 is equal to or less than the spring constant of the first spring 61. Then, as shown in FIGS. 4 (B) and 5, when a tensile force acts from the swing arm 54 on the hand brake non-relaxation detection unit 21, the second spring 70 is displaced (contracted) before the first spring 61. ), The first spring 61 will be displaced (extended) with a delay. This prevents the displacement of the second spring 70 from being delayed compared to the displacement of the first spring 61 when the hand brake mechanism 7 shifts from the non-relaxed state to the relaxed state, and the cylinder 71 and the piston 72 detect it. The relative displacement from the position to the non-detection position will be ensured.

Further, the hand brake non-relaxation detection unit 21 may be provided with elastic boots 74 that cover the insertion holes in the end wall portion of the cylinder 71 through which the piston 72 penetrates. By doing so, it is possible to prevent dust and snow from entering the insertion hole.

According to the configuration described above, when the hand brake mechanism 7 is in the relaxed state, the cylinder 71 and the piston 72 are in the non-detection position due to the urging force of the second spring 70, so that the sensor 63 does not detect the detected portion 73. It can be judged that it is in a relaxed state. On the other hand, when the hand brake mechanism 7 is in a non-relaxed state, the cylinder 71 and the piston 72 are displaced relative to the detection position due to the tensile force from the first spring 61 operated by the hand brake mechanism 7, so that the sensor 63 moves the detected portion 73. By detecting it, it can be determined that it is in an inflexible state. That is, since the expansion / contraction operation of the second spring 70 in the piston unit 62 caused by the operation of the hand brake mechanism 7 by the worker is detected, even if the reference position of the hand brake mechanism 7 changes due to maintenance, the hand brake is performed. The operating state of the mechanism 7 can be accurately detected. Further, since the sensor 63 does not detect the load but detects the position change of the detected portion 73 due to the relative displacement of the cylinder 71 and the piston 72, it is necessary to make a robust sensor that can withstand the brake load. It is possible to suppress the cost increase.

The structure of the hand brake instability detection unit 21 can take various forms. For example, as in the hand brake non-release detection unit 121 shown in FIG. 6, the positional relationship between the cylinder 171 and the piston 172 may be reversed from that of the first embodiment of the piston unit 162. That is, the piston 172 may be provided with a spring connecting portion 172d to which the first spring 61 is connected, and the cylinder 171 may be fixed to the frame 52. Further, unlike the hand brake non-relaxation detection unit 221 shown in FIG. 7, the internal space of the cylinder 271 is not divided into two chambers, but the spring chamber in which the second spring 70 is arranged and the detected portion 73 provided in the piston 272. May be shared with the detection room in which the is arranged.

(Second Embodiment)
FIG. 8 is a cross-sectional view of the hand brake instability detection unit 321 according to the second embodiment. As shown in FIG. 8, the hand brake non-relaxation detection unit 321 is used as a part of the chain 55 of the hand brake mechanism 7 (see FIG. 3). The hand brake non-release detection unit 321 includes a piston unit 362 and a sensor 63 provided in the piston unit 362. The piston unit 362 includes a spring 370, a cylinder 371 (first member) that supports one end of the spring 370, and a piston 372 (second member) that is inserted into the cylinder 371 and supports the other end of the spring 370. Be prepared.

The cylinder 371 has a cylinder main body portion 371a and a chain connecting portion 371b provided on the side of the cylinder main body portion 371a opposite to the side on which the piston 372 is inserted. The piston 372 has a shaft portion 372a, a flange portion 372b that protrudes radially from the shaft portion 372a, and a chain connecting portion 372c that is provided on the side of the shaft portion 372a that is opposite to the collar portion 372b. At the radial outer end of the 372b, a detected portion 73 detected by the sensor 63 is provided. For example, the chain 55A connected to the swing arm 54 (see FIG. 3) is connected to the chain connecting portion 371b of the cylinder 371, and the chain connecting portion 372c of the piston 372 is connected to the handle device 56 (see FIG. 3). The chain 55B is connected.

A sensor 63 is attached to the cylinder body 371a so as to be exposed to the internal space thereof, and a wireless board 381, a sensor 63, and a wireless device for wirelessly transmitting the detection signal of the sensor 63 are mounted on the outer surface of the cylinder body 371a. A battery 382 that supplies power to the substrate 381 is provided. A cover 383 that covers the sensor 63, the wireless board 381, and the battery 382 is attached to the outer surface of the cylinder body 371a.

When the hand brake mechanism 7 is in the relaxed state, the flange portion 372b of the piston 372 is urged by the spring 370, the detected portion 73 of the piston 372 is arranged at a non-detection position not facing the sensor 63, and the sensor 63 is the detected portion. 73 is not detected. On the other hand, when the chains 55A and 55B are wound so as to put the hand brake mechanism 7 in an inflexible state, the spring 370 is compressed by the tensile force acting on the chains 55A and 55B, and the piston unit 362 is extended. Then, the detected portion 73 of the piston 372 faces the sensor 63, and the sensor 63 detects the detected portion 73.

That is, the cylinder 371 and the piston 372 can be displaced relative to each other in the expansion / contraction direction of the spring 370 between the detection position where the sensor 63 detects the detected portion 73 and the non-detection position where the sensor 63 does not detect the detected portion 73. The end wall portion of the cylinder 371 in the expansion / contraction direction of the spring 370 functions as a stopper portion that limits the relative displaceable range of the piston 372 to the range between the detection position and the non-detection position. As described above, the sensor 63 is a contact-type proximity switch, and the sensor 63 does not consume power when the handbrake mechanism 7 is in the relaxed state, and the sensor is in the relaxed state when the handbrake mechanism 7 is in the relaxed state. 63 is configured to consume power, and power consumption is suppressed.

According to the above configuration, in the state where the hand brake mechanism is not operating (relaxed state), the cylinder 371 and the piston 372 are in the non-detection position due to the urging force of the spring 370, so that the sensor 63 detects the detected portion 73. By not doing so, it can be judged that the patient is in a relaxed state. On the other hand, in the state where the handbrake mechanism is activated (non-relaxed state), the cylinder 371 and the piston 372 are relatively displaced to the detection position due to the tensile force generated by the operation of the handbrake mechanism, so that the sensor 63 detects the detected portion 73. It can be judged that it is in an inflexible state. That is, since the expansion / contraction operation of the spring 370 in the piston unit 362 caused by the operation of the hand brake mechanism by the worker is detected, the hand brake mechanism operates even if the reference position of the hand brake mechanism changes due to maintenance. The state can be detected accurately. Further, since the sensor 63 is a proximity switch that does not detect the load but detects the position change of the detected portion 73 due to the relative displacement of the cylinder 371 and the piston 372, it is necessary to make the sensor robust enough to withstand the brake load. It is possible to suppress the cost increase.

The present invention is not limited to the above-described embodiment, and its configuration can be changed, added, or deleted. For example, some configurations or methods in one embodiment may be applied to other embodiments, and some configurations in an embodiment may be optionally separated from other configurations in the embodiment. It can be extracted. The first member and the second member that support the spring in the piston unit do not have to be a cylinder and a piston, and may have other shapes as long as they support the spring and can be relatively displaced in the spring expansion / contraction direction. If the power consumption does not matter, it is not necessary to use a contact-type proximity switch as the sensor 63, and any other sensor 63 may be used as long as it can detect that the detected unit 73 is approaching.

1 Freight train 3A to C, 4A to C freight cars 7 Hand brake mechanism 10 Hand brake non-release detection system 21,121,221,321 Hand brake non-release detection unit 55, 55A, 55B Chain 61 1st spring 62, 162,362 Piston unit 63 Sensor 70 2nd spring 71,171,271,371 Cylinder 71c Stopper 72,172,272,372 Piston 73 Detected

Claims (5)

It is a hand brake instability detection unit installed as a return spring in the hand brake mechanism of a freight car.
With the first spring
The piston unit connected to the first spring and
A sensor provided in the piston unit is provided.
The piston unit is
With the second spring
The first member that supports one end of the second spring and
It has a second member that supports the other end of the second spring and includes a detected portion detected by the sensor.
The first member or the second member is connected to the first spring, and the first member or the second member is connected to the first spring.
The first member and the second member are attached to each other in the expansion / contraction direction of the second spring between a detection position where the sensor detects the detected portion and a non-detection position where the sensor does not detect the detected portion. Relative displacement is possible ,
The hand brake non-relaxation detection unit whose spring constant of the second spring is equal to or less than the spring constant of the first spring . The hand brake inflexibility detection unit according to claim 1, wherein the first member includes a stopper portion that limits the relative displaceable range of the second member to a range between the detection position and the non-detection position. The sensor is a proximity switch that does not consume power in a state where the detected portion is not detected and consumes power in a state where the detected portion is detected.
The first member and the second member are located at the non-detection position when the hand brake mechanism is in the relaxed state, and are located at the detection position when the hand brake mechanism is in the non-relaxed state. Item 2. The hand brake non-relaxation detection unit according to Item 1 or 2. One of the first member and the second member is a cylinder, and one of the first member and the second member is a piston inserted into the cylinder.
The hand brake inflexibility detection unit according to any one of claims 1 to 3 , further comprising an elastic boot covering an insertion hole through which the piston is inserted in the cylinder. A freight train freight car provided with the hand brake instability detection unit according to any one of claims 1 to 4 .

Images