Pneumatic door device

Abstract

To provide a pneumatic door device which grasps a door leaf thrust during door opening / closing by the pneumatic door device without movement of a detection part with a piston.SOLUTION: A pneumatic door device comprises a cylinder 20 which makes a piston connected to a door leaf installed in an entrance of a railway vehicle move by compressed air introduced into an air chamber, a second support part 17 movably supporting the cylinder body 20A, a fix wall 15 positionally fixed relative to the entrance, and a load cell 50 which is fixed to the fix wall 15 and detects a pressure applied to the fix wall 15 by the cylinder body 20A through a movement of the cylinder body 20A in a counter direction of the piston movement direction by the compressed air introduced into the air chamber.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a pneumatic door device. [Background technology]

[0002] Some railroad car door drive devices use pneumatic cylinders as a power source. It is necessary to know the state of the doors. Patent Document 1 describes a technology for detecting the torque of a pneumatic cylinder, which detects the output of a pressure sensor attached to the tip of the piston rod of the air cylinder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4132250 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the technology described in Patent Document 1 is applied to a railway vehicle door, the pressure sensor is mounted on the tip of the piston rod, and moves together with the piston rod. This requires a movable wiring such as a Cableveyor (registered trademark) to protect the connecting wire connected to the pressure sensor. Therefore, there is room for improvement. [Means for solving the problem]

[0005] An air-operated door device that solves the above problem comprises a cylinder that uses compressed air introduced into an air chamber to move a piston connected to a door leaf installed at the boarding and alighting entrance of a railway vehicle, a support part that supports the cylinder so that it can move along the direction of movement of the piston, a fixed wall that is fixed in position relative to the boarding and alighting entrance, and a detection part that is fixed to the fixed wall, and which detects the pressure that the cylinder applies to the fixed wall as the compressed air introduced into the air chamber moves the cylinder in the direction opposite to the direction of movement of the piston.

[0006] According to the above configuration, the pressure applied to the fixed wall, which is fixed in position relative to the entrance, is detected by the detector fixed to the fixed wall as the cylinder that opens and closes the door leaf moves. Therefore, it is possible to grasp the thrust of the door leaf when the door is opened or closed by the pneumatic door device without moving the detector together with the piston as in the conventional technology.

[0007] In the above pneumatic door device, the fixed wall is preferably provided on a second surface side of the cylinder opposite to a first surface side from which the piston projects. In the above pneumatic door device, it is preferable that the detection unit is a pressure sensor, and a first end of the pressure sensor is fixed to a contact surface of the fixed wall that contacts the cylinder.

[0008] In the above pneumatic door device, it is preferable that a second end of the pressure sensor located opposite to the first end is fixed to the second surface of the cylinder. In the above-mentioned pneumatic door device, it is preferable that the support part includes a guide and a rail that can move relatively along the guide, and that the cylinder is fixed to one of the guide and the rail, and the other of the guide and the rail is fixed so as to be immovable.

[0009] In the above-mentioned pneumatic door device, it is preferable that the cylinder includes a first cylinder having the air chamber, and a second cylinder provided in the air chamber and moved relative to the first cylinder by the compressed air introduced into the air chamber, and the detection unit detects the pressure applied to the fixed wall by the first cylinder moving in the opposite direction to the movement direction of the second cylinder moved by the compressed air introduced into the air chamber.

[0010] It is preferable that the pneumatic door device further comprises a determination unit that compares the detection value detected by the detection unit with a reference value to determine deterioration of the pneumatic door device. The above-mentioned pneumatic door device preferably includes a signal acquisition unit that acquires a fully closed detection signal indicating that the door leaf is in the fully closed position, and a judgment unit that judges that an object is caught in the door when the detection value detected by the detection unit is equal to or greater than a threshold value and the fully closed detection signal has not been acquired.

[0011] The pneumatic door device preferably includes a pressure adjusting unit that increases the pressure of the compressed air introduced into the air chamber when the value detected by the detecting unit is lower than a target value.

[0012] The pneumatic door device preferably includes a pressure adjusting unit that adjusts the pressure of the compressed air introduced into the air chamber based on the difference between the detection value detected by the detection unit and a target value. [Effects of the Invention]

[0013] According to the present invention, the thrust of the door leaf when the door is opened or closed by the pneumatic door device can be grasped without moving the detection unit together with the piston. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a schematic configuration of a first embodiment of a pneumatic door device in a fully open state. [Figure 2] FIG. 2 is a plan view showing the schematic configuration of the pneumatic door device of the embodiment in a fully open state. [Figure 3] FIG. 2 is a plan view showing a schematic configuration of the pneumatic door device of the embodiment in a fully closed state. [Figure 4] FIG. 2 is an enlarged plan view showing a schematic configuration of a cylinder base end of the pneumatic door device according to the embodiment; [Figure 5] FIG. 2 is an enlarged plan view showing a schematic configuration of a cylinder base end of the pneumatic door device according to the embodiment; [Figure 6] 5(a) to 5(d) are schematic diagrams showing the operation of a cylinder of the pneumatic door device of the embodiment. [Figure 7] FIG. 2 is an air circuit diagram of the pneumatic door device according to the embodiment. [Figure 8] FIG. 2 is a block diagram showing the electrical configuration of the pneumatic door device according to the embodiment. [Figure 9] 6 is a graph showing the speed of the door and the detection value of the detection unit during the closing operation of the pneumatic door device of the embodiment. [Figure 10] 6 is a graph showing the speed of the door and the detection value of the detection unit during the opening operation of the pneumatic door device of the embodiment. [Figure 11] FIG. 4 is a front view showing a schematic configuration of a second embodiment of a pneumatic door device. DETAILED DESCRIPTION OF THE INVENTION

[0015] (First embodiment) A first embodiment of a pneumatic door device will be described below with reference to Figures 1 to 10. The pneumatic door device is a device that drives the opening and closing of a door leaf installed at the entrance of a railway vehicle.

[0016] As shown in FIGS. 1 to 3, a pneumatic door device 10 is installed above a boarding / alighting door 2 of a railway vehicle 1. The pneumatic door device 10 includes a plurality of fixing portions 11 fixed to the top of the boarding / alighting door 2 of the railway vehicle 1. The fixing portions 11 support a rail base 12 extending in the opening / closing direction of the door leaf 3 via fixing plates 14. The pneumatic door device 10 includes, from the left side in the drawings, a first fixing portion 11A, a second fixing portion 11B, and a third fixing portion 11C. The pneumatic door device 10 also includes, from the left side in the drawings, a first fixing plate 14A, a second fixing plate 14B, and a third fixing plate 14C. The first fixing plate 14A is supported by the first fixing portion 11A. The second fixing plate 14B is supported by the second fixing portion 11B. The third fixing plate 14C is supported by the third fixing portion 11C. The door leaf 3, which is a main support member that supports each device of the door device, is attached to the rail base 12 so that it can move in the opening and closing direction. A door hanger 13 connected to the upper end 3A of the door leaf 3 is attached to the rail base 12.

[0017] The second fixing portion 11B and the third fixing portion 11C support the cylinder 20 via the second fixing plate 14B and the third fixing plate 14C. The cylinder 20 drives the door leaf 3 to open and close. The cylinder 20 has a piston 23 that protrudes from a cylinder body 20A. The cylinder 20 drives the piston 23 by introducing compressed air. The door hanger 13 of the door leaf 3 is connected to the tip 23A of the piston 23. Therefore, when the piston 23 of the cylinder 20 moves in a direction protruding from the cylinder body 20A, the door leaf 3 moves to the open position as shown in FIG. 2. On the other hand, when the piston 23 of the cylinder 20 moves in a direction retracting into the cylinder body 20A, the door leaf 3 moves to the closed position as shown in FIG. 3.

[0018] A first support portion 16 and a second support portion 17 are provided between the second fixed portion 11B and the third fixed portion 11C and the cylinder 20 to movably support the cylinder 20 along the movement direction of the piston 23. The first support portion 16 is provided between the second fixed portion 11B and the cylinder 20. The second support portion 17 is provided between the third fixed portion 11C and the cylinder 20. A control device 40 that controls the pneumatic door device 10 is provided above the cylinder main body 20A.

[0019] As shown in Fig. 4, the first support part 16 includes a guide 16A and a rail 16B that is relatively movable along the guide 16A. The cylinder body 20A is fixed to the guide 16A, and the second fixed part 11B is immovably fixed to the rail 16B. The second support part 17 includes a guide 17A and a rail 17B that is relatively movable along the guide 17A. The cylinder body 20A is fixed to the guide 17A, and the third fixed part 11C is immovably fixed to the rail 17B. Alternatively, the cylinder body 20A may be fixed to the rail, and the third fixed part 11C may be immovably fixed to the guide.

[0020] The pneumatic door device 10 includes a fixed wall 15 whose position is fixed relative to the entrance / exit opening 2. The fixed wall 15 is connected to a third fixed plate 14C. The fixed wall 15 is provided on a second surface 20C of the cylinder body 20A, opposite the first surface 20B from which the piston 23 protrudes. A load cell 50 serving as a detector is installed between the second surface 20C of the cylinder body 20A and the fixed wall 15. A first end 51 of the load cell 50 is fixed to the contact surface of the fixed wall 15 with the cylinder body 20A. Thus, the load cell 50 is fixed in position relative to the entrance / exit opening 2. A second end 52 of the load cell 50, located opposite the first end 51, is fixed to the second surface 20C of the cylinder body 20A. The load cell 50 detects the pressure applied by the cylinder body 20A to the fixed wall 15 when the cylinder body 20A moves in the direction opposite to the movement of the piston 23 due to compressed air introduced into the air chamber. The load cell 50 outputs the detection result to the control device 40. The load cell 50 is a pressure sensor. The pressure F that the cylinder 20 applies to the fixed wall 15 and that is detected by the load cell 50 is calculated by the following formula (1).

[0021] F=ma+dynamic friction resistance...(1) m is the weight of the door or hanger. a is the acceleration of the piston (door leaf). Dynamic friction resistance is the sliding resistance of the piston, including the friction resistance of the rail, the piston, and the friction resistance of the seal material.

[0022] As shown in Fig. 5, the load cell 50 may be installed in a position parallel to the movement direction of the piston 23. In this case, the load cell 50 is installed between the fixed wall 15 and the convex portion 24 protruding from the side surface of the cylinder body 20A. A first end 51 of the load cell 50 is fixed to the fixed wall 15. A second end 52 of the load cell 50 is fixed to a surface of the convex portion 24 of the cylinder body 20A that is perpendicular to the movement direction of the piston 23. The load cell 50 detects the pressure that the cylinder body 20A applies to the fixed wall 15 and outputs the detection result to the control device 40.

[0023] 6(a), the cylinder 20 includes a first cylinder 21 having a first air chamber 21A and a second air chamber 21B, and a second cylinder 22 provided in the first air chamber 21A and the second air chamber 21B and moving relative to the first cylinder 21 by compressed air introduced into the first air chamber 21A and the second air chamber 21B. A piston 23 is housed in the second cylinder 22. The load cell 50 detects the pressure applied to the fixed wall 15 by the first cylinder 21, which moves in the direction opposite to the direction of movement of the second cylinder 22, which is moved by the compressed air introduced into the first air chamber 21A and the second air chamber 21B.

[0024] 6(b), when compressed air is introduced into the first air chamber 21A located on the left side of the first cylinder 21, the second cylinder 22 moves to the right within the first cylinder 21. The piston 23 moves to the right within the first cylinder 21 together with the second cylinder 22.

[0025] 6(c), the second cylinder 22 moves to the right end within the first cylinder 21. When the second cylinder 22 moves to the right end within the first cylinder 21, the compressed air introduced into the first air chamber 21A is introduced into the third air chamber 22A located on the left side within the second cylinder 22.

[0026] 6(d), when compressed air is introduced into the third air chamber 22A of the second cylinder 22, the piston 23 moves to the right inside the second cylinder 22. The piston 23 moves to the right end inside the second cylinder 22. In other words, by having the piston 23 move inside the second cylinder 22 after the second cylinder 22 moves inside the first cylinder 21, the speed of the piston 23 before it completes its movement can be reduced, thereby suppressing impact.

[0027] As shown in Figure 6(d), when compressed air is introduced into the second air chamber 21B located on the right side within the first cylinder 21, the second cylinder 22 moves to the left within the first cylinder 21. The piston 23 moves to the left within the first cylinder 21 together with the second cylinder 22. The piston 23 is housed in the cylinder body 20A.

[0028] As shown in FIG. 6(a), the second cylinder 22 moves to the left end within the first cylinder 21. When the second cylinder 22 moves to the left end within the first cylinder 21, the compressed air introduced into the second air chamber 21B is introduced into the fourth air chamber 22B located on the right side within the second cylinder 22. When compressed air is introduced into the fourth air chamber 22B of the second cylinder 22, the piston 23 moves to the left within the second cylinder 22. The piston 23 moves to the left end within the second cylinder 22. In other words, after the second cylinder 22 moves within the first cylinder 21, the piston 23 moves within the second cylinder 22, thereby reducing the impact at the end of the movement of the piston 23.

[0029] As shown in FIG. 7 , an air circuit 30 is connected to the cylinder 20. The air circuit 30 includes an air passage 31 to which compressed air is supplied from a supply source (not shown). A door-closing solenoid valve 32 is connected to the air passage 31. The door-closing solenoid valve 32 is a two-position solenoid valve that supplies compressed air to the cylinder 20. When power is supplied to the door-closing solenoid valve 32, it introduces compressed air into the first air chamber 21A via a first supply path 33. On the other hand, when power is cut off, the door-closing solenoid valve 32 introduces compressed air into the second air chamber 21B via a second supply path 36. When compressed air is supplied to the first supply path 33, the compressed air is discharged from the second supply path 36. When compressed air is supplied to the second supply path 36, the compressed air is discharged from the first supply path 33. A closing weakening adjustment screw 34 and a closing speed adjustment screw 35 are provided in parallel in the first supply path 33. A weakening opening adjustment screw 37 and an opening speed adjustment screw 38 are provided in parallel in the second supply path 36. A control valve 39 is provided upstream of the door-closing solenoid valve 32 in the air path 31. The control valve 39 adjusts the pressure (flow rate) of the compressed air supplied from the supply source in accordance with a signal from a control device 40.

[0030] As shown in FIG. 8, the control device 40 may be configured as one or more processors that execute various processes according to a computer program (software). The control device 40 may also be configured as a circuit including one or more dedicated hardware circuits, such as an application-specific integrated circuit (ASIC), that execute at least some of the various processes, or a combination thereof. The processor includes a CPU and memory, such as RAM and ROM. The memory stores program code or instructions configured to cause the CPU to execute processes. The memory, i.e., computer-readable medium, includes any available medium accessible by a general-purpose or special-purpose computer. The control device 40 controls the pneumatic door device 10 according to a program stored in the computer-readable medium.

[0031] The control device 40 is electrically connected to the door closing solenoid valve 32 and the adjustment valve 39, and controls the door closing solenoid valve 32 and the adjustment valve 39. The control device 40 obtains a detection value from the load cell 50. The pneumatic door device 10 is equipped with a full-close detection unit 45. The full-close detection unit 45 is a sensor that physically detects that the door leaf 3 has moved to the full-close position, and outputs a full-close detection signal to the control device 40. The control device 40 obtains the full-close detection signal from the full-close detection unit 45.

[0032] The control device 40 includes a control unit 41, a determination unit 42, an adjustment unit 43, and a signal acquisition unit 44. The control unit 41 controls the pneumatic door device 10 by driving and controlling the door closing solenoid valve 32. That is, the control unit 41 energizes the door closing solenoid valve 32 to open the door leaf 3, and stops energizing the door closing solenoid valve 32 to close the door leaf 3.

[0033] The determination unit 42 compares the detection value obtained from the load cell 50 with a reference value to determine deterioration of the pneumatic door device 10. The determination unit 42 determines that deterioration has occurred when the absolute value of the difference between the detection value obtained from the load cell 50 and the reference value is equal to or greater than a predetermined value. Deterioration can be caused by factors such as lack of grease on the rail, deterioration of the piston packing, uneven wear on the inner wall of the cylinder, or dust adhesion to the rail. The detection value compared with the reference value may be each value, an average value, a median value, or the like over a predetermined period of time. The reference value may be stored in advance in the memory of the control device 40 at the time of shipment, or a test operation may be performed immediately after the pneumatic door device 10 is installed on the railway vehicle 1, and the detection value may be stored in the memory of the control device 40 as the reference value.

[0034] The determination unit 42 also compares the detection value detected by the load cell 50 with a threshold value to determine whether an object is caught in the door. Furthermore, the signal acquisition unit 44 acquires a full-close detection signal indicating that the door leaf 3 is in the fully closed position. The determination unit 42 determines that an object is caught in the door when it determines that the detection value is equal to or greater than the threshold value and that it has not acquired a full-close detection signal. If the pneumatic door device 10 determines that an object is deteriorating or caught in the door, it outputs a message to that effect to a higher-level device.

[0035] The adjustment unit 43 controls the adjustment valve 39. The adjustment unit 43 adjusts the air pressure supplied to the cylinder 20 based on the detection value acquired from the load cell 50. For example, if the detection value acquired from the load cell 50 is lower than the target value, the adjustment unit 43 increases the air pressure supplied to the cylinder 20 based on the difference between the detection value and the target value. If the detection value acquired from the load cell 50 is higher than the target value, the adjustment unit 43 decreases the air pressure supplied to the cylinder 20 based on the difference between the detection value and the target value. The detection value compared with the target value may be each value, an average value, a median value, or the like over a predetermined period. The air pressure adjusted by the adjustment unit 43 may be increased or decreased by a predetermined amount regardless of the difference between the detection value and the target value. The reference value used by the determination unit 42 for deterioration determination and the target value used by the adjustment unit 43 may be the same value or different values. The adjustment unit 43 and the adjustment valve 39 function as a pressure regulator. The adjusting unit 43 performs feedback control of the adjusting valve 39 based on the detected value.

[0036] Next, the operation of the pneumatic door device 10 configured as described above will be described with reference to Figures 9 and 10. Figure 9 shows the door leaf 3 when it closes. Figure 10 shows the door leaf 3 when it opens. The pressure F detected by the load cell 50 is detected according to the acceleration, which is the gradient of the speed of the door leaf 3. Because the direction of movement of the door leaf 3 is opposite when it closes and when it opens, the pressure F detected by the load cell 50 has the opposite sign to that in Figures 9 and 10.

[0037] As shown in Figure 9, when the door leaf 3 is closed, the cylinder 20 starts supplying compressed air to the second air chamber 21B at the first time T1 and continues supplying compressed air to the second air chamber 21B until the third time T3. At the first time T1, the second cylinder 22 moves together with the piston 23 within the first cylinder 21 in the direction in which the door leaf 3 is closed. The pressure F detected by the load cell 50 increases from the first time T1 in response to the acceleration, which is the gradient of the velocity of the door leaf 3, decreases by the second time T2, and remains constant from the second time T2 to the third time T3. The pressure F between the second time T2 and the third time T3 corresponds to kinetic friction resistance because the door leaf 3 is moving at a constant velocity.

[0038] Subsequently, at the third time T3, the second cylinder 22 reaches the left end of the first cylinder 21 and stops moving. Compressed air is supplied to the fourth air chamber 22B of the second cylinder 22 from the third time T3, causing the piston 23 to move within the second cylinder 22 in the direction of closing the door leaf 3. The piston 23 stops at the sixth time T6. The pressure F detected by the load cell 50 decreases from the third time T3 in response to the acceleration, which is the gradient of the velocity of the door leaf 3, increases by the fourth time T4, and remains constant from the fourth time T4 to the fifth time T5. The pressure F between the fourth time T4 and the fifth time T5 corresponds to the kinetic friction resistance excluding the kinetic friction resistance of the second cylinder 22 relative to the first cylinder 21. The pressure F detected by the load cell 50 decreases from the fifth time T5 in response to the acceleration, which is the gradient of the velocity of the door leaf 3, and increases by the sixth time T6.

[0039] The determination unit 42 determines deterioration based on the detection values ​​acquired from the load cell 50 from the first time T1 to the sixth time T6. The determination unit 42 may calculate the average or median of the detection values ​​from the first time T1 to the sixth time T6 and determine deterioration when the absolute value of the difference between the average or median and a reference value is equal to or greater than a predetermined value. Alternatively, the determination unit 42 may determine deterioration when the absolute value of the difference between the detection value and the reference value is equal to or greater than a predetermined value between the second time T2 and the third time T3 or between the fourth time T4 and the fifth time T5, when the detection values ​​are stable. Alternatively, the determination unit 42 may determine deterioration of the pneumatic door device 10 when the detection value is higher than the reference value. When the detection value acquired from the load cell 50 is lower than a target value, the adjustment unit 43 controls the adjustment valve 39 to increase the air pressure supplied to the cylinder 20.

[0040] If the door leaf 3 comes into contact with a person or object other than the door stop during its movement, causing a door entrapment, the door leaf 3 rapidly decelerates due to the contact. Therefore, the load cell 50 detects a detection value that decreases and then increases between the fourth time T4 and the fifth time T5, as indicated by the two-dot chain line. The determination unit 42 determines a door entrapment because the detection value is equal to or greater than the threshold value for a normal detection value and a full-close detection signal is not received. Similarly, the determination unit 42 determines a door entrapment if the detection value is equal to or greater than the threshold value for a normal detection value between the second time T2 and the third time T3 and a full-close detection signal is not received. The control unit 41 stops the supply of compressed air to the second air chamber 21B to stop the movement of the door leaf 3 in the closing direction. Alternatively, the control unit 41 supplies compressed air to the first air chamber 21A to reverse the movement of the door leaf 3 in the opening direction. When a full-close detection signal is acquired and the detected value is equal to or greater than the threshold value, the determination unit does not determine that the door is caught in the door because there is a high possibility of contact with the door stopper when the door is fully closed.

[0041] As shown in Figure 10, when the door leaf 3 is opened, the cylinder 20 starts supplying compressed air to the first air chamber 21A at the first time T1 and continues supplying compressed air to the first air chamber 21A until the third time T3. At the first time T1, the second cylinder 22 moves together with the piston 23 within the first cylinder 21 in the direction in which the door leaf 3 opens. The pressure F detected by the load cell 50 decreases from the first time T1 in response to the acceleration, which is the gradient of the velocity of the door leaf 3, increases by the second time T2, and remains constant from the second time T2 to the third time T3. The pressure F between the second time T2 and the third time T3 corresponds to kinetic friction resistance because the door leaf 3 is moving at a constant velocity.

[0042] Subsequently, at the third time T3, the second cylinder 22 reaches the right end of the first cylinder 21 and stops moving. Compressed air is supplied to the third air chamber 22A of the second cylinder 22 from the third time T3, causing the piston 23 to move in the second cylinder 22 in the direction of opening the door leaf 3. The piston 23 stops at the sixth time T6. The pressure F detected by the load cell 50 increases from the third time T3 in response to the acceleration, which is the gradient of the velocity of the door leaf 3, decreases by the fourth time T4, and remains constant from the fourth time T4 to the fifth time T5. The pressure F between the fourth time T4 and the fifth time T5 corresponds to the kinetic friction resistance excluding the kinetic friction resistance of the second cylinder 22 relative to the first cylinder 21. The pressure F detected by the load cell 50 increases from the fifth time T5 in response to the acceleration, which is the gradient of the velocity of the door leaf 3, and decreases by the sixth time T6.

[0043] The determination unit 42 determines deterioration based on the detection values ​​acquired from the load cell 50 from the first time T1 to the sixth time T6. The determination unit 42 may calculate the average or median of the detection values ​​from the first time T1 to the sixth time T6 and determine deterioration when the absolute value of the difference between the average or median and a reference value is equal to or greater than a predetermined value. Alternatively, the determination unit 42 may determine deterioration when the absolute value of the difference between the detection value and the reference value is equal to or greater than a predetermined value between the second time T2 and the third time T3 or between the fourth time T4 and the fifth time T5, when the detection values ​​are stable. Alternatively, the determination unit 42 may determine deterioration when the detection value is higher than the reference value. When the detection value acquired from the load cell 50 is lower than a target value, the adjustment unit 43 controls the adjustment valve 39 to increase the air pressure supplied to the cylinder 20.

[0044] As described above, the pneumatic door device 10 can use the load cell 50 to detect the pressure that the cylinder 20 applies to the fixed wall 15 when the door leaf 3 opens or closes, and can determine deterioration of the pneumatic door device 10 based on the detected pressure. The pneumatic door device 10 can also determine whether the door is pinched based on the detected pressure.

[0045] Next, the effects of the first embodiment will be described. (1-1) As the cylinder 20 that opens and closes the door leaf 3 moves, the load cell 50 fixed to the fixed wall 15 detects the pressure it applies to the fixed wall 15. Therefore, it is possible to grasp the thrust of the door leaf 3 when the door is opened or closed by the pneumatic door device 10 without having to move the detection unit together with the piston as in the prior art.

[0046] (1-2) The fixed wall 15 is provided on the second surface 20C side of the cylinder 20. Therefore, the force applied to the cylinder 20 from the door leaf 3 via the piston 23 can be detected as pressure on the axis of the piston 23.

[0047] (1-3) Since the first end 51 of the load cell 50 is fixed to the fixed wall 15, the pressure can be detected by the movement of the cylinder 20 relative to the fixed wall 15. (1-4) Since the load cell 50 is fixed to the second surface 20C of the cylinder 20, the load cell 50 does not separate from the cylinder 20 and can detect the entire range of the opening and closing movement of the piston 23.

[0048] (1-5) The cylinder 20 can be moved in the moving direction of the piston 23 by the first support portion 16 including the guide 16A and the rail 16B and the second support portion 17 including the guide 17A and the rail 17B.

[0049] (1-6) Even if the cylinder that opens and closes the door leaf 3 of the railway vehicle 1 is a cylinder 20 that slows down before the opening and closing movement is completed, the load cell 50 can detect the pressure that the first cylinder 21 applies to the fixed wall 15 without any effect.

[0050] (1-7) The determination unit 42 can determine the deterioration of the pneumatic door device 10 based on the detected value detected by the load cell 50. (1-8) The determination unit 42 can determine whether the door leaf 3 is caught in the door based on the full-close detection signal obtained from the full-close detection unit 45 and the detection value obtained from the load cell 50.

[0051] (1-9) When the detected value detected by the load cell 50 is lower than the target value, the air pressure is increased to ensure the opening and closing movement of the door leaf 3. Also, when the detected value detected by the load cell 50 is higher than the target value, the air pressure is decreased to suppress the impact caused by the opening and closing movement of the door leaf 3.

[0052] (Second embodiment) A second embodiment of the pneumatic door device will be described below with reference to Figure 11. The pneumatic door device of this embodiment differs from the first embodiment in the support structure of the cylinder. The following description will focus on the differences from the first embodiment.

[0053] As shown in FIG. 11 , the pneumatic door device 10 includes fixed walls 63 and 64 that support the cylinder body 20A via links. The fixed wall 63 is connected to the second fixed plate 14B. The fixed wall 64 is connected to the third fixed plate 14C. A first link 61 is provided between the cylinder body 20A and the fixed wall 63. A second link 62 is provided between the cylinder body 20A and the fixed wall 64. Therefore, the cylinder 20 is supported by the first link 61 and the second link 62 so as to be movable along the movement direction of the piston 23. As in the first embodiment, a load cell 50 is provided as a detector between the second surface 20C of the cylinder body 20A and the fixed wall 64. The load cell 50 detects the pressure applied by the cylinder body 20A to the fixed wall 15 when the cylinder body 20A moves in the direction opposite to the movement direction of the piston 23 due to compressed air introduced into the air chamber. The load cell 50 outputs the detection result to the control device 40.

[0054] As in the first embodiment, the pneumatic door device 10 can use the load cell 50 to detect the pressure that the cylinder 20 applies to the fixed wall 64 when the door leaf 3 opens or closes. The pneumatic door device 10 can also determine deterioration and door entrapment of the pneumatic door device 10 based on the detected pressure.

[0055] Next, the effects of the second embodiment will be described. In addition to the effects (1-1) to (14) and (1-6) to (1-9) of the first embodiment, the second embodiment has the following effects. (2-1) The first link 61 and the second link 62 allow the cylinder 20 to move in the direction in which the piston 23 moves.

[0056] (Other embodiments) The above-described embodiments can be modified as follows: The above-described embodiments and the following modifications can be combined with each other within the scope of technical compatibility.

[0057] In each of the above embodiments, the normal reference values ​​from the first time T1 to the sixth time T6 may be stored in the memory of the control device 40, and the judgment unit 42 may calculate the difference between the reference value and the detected value at each time, and judge whether the average or median of the difference is equal to or greater than a predetermined value.

[0058] In each of the above embodiments, the judgment unit 42 may judge that deterioration has occurred when the absolute value of the difference between the detection value obtained from the load cell 50 and the reference value is greater than or equal to a predetermined value not just once but a predetermined number of times.

[0059] In the above embodiments, the air pressure supplied to the cylinder 20 is increased when the detected value obtained from the load cell 50 is lower than the target value. However, the air pressure supplied to the cylinder 20 may be adjusted based on the difference between the detected value obtained from the load cell 50 and the target value.

[0060] In each of the above embodiments, the adjustment unit 43 and the adjustment valve 39 are provided to adjust the air pressure supplied to the cylinder 20 based on the detection value detected by the load cell 50. However, the adjustment unit 43 and the adjustment valve 39 may be omitted.

[0061] In the above embodiments, it is determined whether the door leaf 3 is fully closed or whether there is something caught in the door based on the full-close detection signal from the full-close detection unit 45 and the detection value detected by the load cell 50, but this determination does not have to be made.

[0062] In the above embodiments, the detection value obtained from the load cell 50 is compared with the threshold value to determine whether or not something is caught in a door. However, this determination need not be made. In the above embodiments, the cylinder 20 is used in which a second cylinder is housed within a first cylinder and a piston is housed in the second cylinder. However, a cylinder in which a piston is housed in a single cylinder may also be used.

[0063] In the first embodiment, the support portion includes a guide and a rail, but other configurations may be used as long as the cylinder body 20A can be supported in the moving direction of the piston 23. In the above embodiments, the second end 52 of the load cell 50 is fixed to the second surface 20C of the cylinder body 20A. However, if it is not necessary to detect the force acting on the piston 23 of the cylinder body 20A as it moves in the protruding direction, the second end 52 of the load cell 50 does not have to be fixed.

[0064] In each of the above embodiments, the second end 52 of the load cell 50 is fixed to the second surface 20C of the cylinder body 20A, but the second end 52 of the load cell 50 may also be fixed to the second surface 20C of the cylinder body 20A. Note that it is preferable that the first end 51 of the load cell 50 is fixed by providing a fixed wall connected to the second fixing plate 14B close to the second surface 20C of the cylinder body 20A.

[0065] In the above embodiments, the load cell 50 is used as the detector to detect the pressure applied by the cylinder 20 to the fixed walls 15, 64. However, a strain sensor may be used as the detector to convert the pressure applied by the cylinder to the fixed wall into strain on the object. The detector may detect the pressure directly or indirectly by converting the pressure into another physical quantity.

[0066] In the above embodiments, the door leaf 3 is opened when the piston protrudes from the cylinder and closed when the piston retracts into the cylinder. However, the door leaf 3 may be closed when the piston protrudes from the cylinder and opened when the piston retracts into the cylinder.

[0067] In the above embodiments, the pneumatic door device is used in a single sliding door that opens and closes one door leaf 3. However, the pneumatic door device may also be used in a double sliding door that opens and closes two door leaves. Also, the pneumatic door device may be used in a plug door.

[0068] In each of the above embodiments, if an object is made up of multiple objects, the multiple objects may be integrated, and conversely, if an object is made up of a single object, it may be divided into multiple objects. Regardless of whether the objects are integrated or not, it is sufficient that the object of the invention can be achieved. [Explanation of symbols]

[0069] 1. Railway vehicles 2...Platform 3...Door leaf 3A...Top end 10...Pneumatic door device 11...Fixed part 11A…First fixed part 11B…Second fixed part 11C...Third fixed part 12...Rail base 13...Door hanger 14…Fixing plate 14A…1st fixing plate 14B…Second fixing plate 14C...Third fixed plate 15…Fixed wall 16...First support part 16A...Guide 16B...rail 17…Second support part 17A...Guide 17B...rail 20...Cylinder 20A...Cylinder body 20B…Side 1 20C…Second side 21...1st cylinder 21A...First air chamber 21B...Second air chamber 22...Second cylinder 22A...Third air chamber 22B...Fourth air chamber 23...Piston 23A…Tip 24...Convex part 30...Air circuit 31...Air passage 32...Door closing solenoid valve 33…1st supply route 34...Weak closing adjustment screw 35...Closing speed adjustment screw 36…Second supply path 37...Weak opening adjustment screw 38...Opening speed adjustment screw 39...Control valve 40...Control device 41...Control unit 42…Judgment department 43...Adjustment section 44...Signal acquisition unit 45...Fully closed detection section 50...Load cell (detection part) 51...1st end 52…Second end 61...1st link 62...Second link 63…Fixed wall 64…Fixed wall

Claims

1. a cylinder that moves a piston connected to a door leaf installed at a boarding / alighting entrance of a railway vehicle by compressed air introduced into an air chamber; a support portion that supports the cylinder movably along a movement direction of the piston; A fixed wall whose position is fixed relative to the boarding / alighting entrance; a detection unit fixed to the fixed wall, the detection unit detecting a pressure applied to the fixed wall by the cylinder when the cylinder moves in a direction opposite to the moving direction of the piston by compressed air introduced into the air chamber; the cylinder includes a first cylinder having the air chamber, and a second cylinder provided in the air chamber and moved relative to the first cylinder by compressed air introduced into the air chamber, the piston is housed in the second cylinder and is movable within the second cylinder; The detection unit detects the pressure applied to the fixed wall by the first cylinder, which moves in a direction opposite to the direction of movement of the second cylinder caused by the compressed air introduced into the air chamber. Pneumatic door device.

2. The fixed wall is provided on a second surface side of the cylinder opposite to a first surface side from which the piston protrudes. The pneumatic door device of claim 1.

3. the detection unit is a pressure sensor, A first end of the pressure sensor is fixed to a contact surface of the fixed wall with the cylinder.

3. The pneumatic door device of claim 2.

4. A second end of the pressure sensor, located opposite to the first end, is fixed to the second surface of the cylinder.

4. The pneumatic door device of claim 3.

5. the support portion includes a guide and a rail that is relatively movable along the guide, the cylinder is fixed to one of the guide and the rail; The other of the guide and the rail is fixed immovably. The pneumatic door device according to any one of claims 1 to 4.

6. A determination unit is provided that compares the detected value detected by the detection unit with a reference value to determine deterioration of the pneumatic door device. The pneumatic door device according to any one of claims 1 to 5.

7. a signal acquisition unit that acquires a full-close detection signal indicating that the door leaf is in a full-close position; A determination unit is provided that determines that an object is caught in the door when it is determined that the detection value detected by the detection unit is equal to or greater than a threshold value and the full-close detection signal has not been acquired. The pneumatic door device according to any one of claims 1 to 6.

8. a pressure adjusting unit that increases the pressure of the compressed air introduced into the air chamber when the detected value detected by the detecting unit is lower than a target value; The pneumatic door device according to any one of claims 1 to 7.

9. a pressure adjusting unit that adjusts the pressure of the compressed air introduced into the air chamber based on the difference between the detected value detected by the detecting unit and a target value; The pneumatic door device according to any one of claims 1 to 7.

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