Pneumatic drive assembly, current collector and vehicle

Abstract

The invention relates to a pneumatic drive assembly comprising a lifting drive (3), which can be supplied with compressed air via a supply line (6), for lifting a current collector, and a rapid lowering device (8) for lowering the current collector by venting the lifting drive (3). According to the invention, a monitoring line (9) of the rapid lowering device (8) is coupled to the supply line (6) and a 5 / 2-way valve (10) of the rapid lowering device (8), wherein the supply line (6) is connected to the monitoring line (9) via a supply throttle valve (16), wherein, in a first switching position of the 5 / 2-way valve (10), the lifting drive (3) is connected to the supply line (6) and the expansion chamber (11) is connected to the venting apparatus (12), and wherein, in a second switching position of the 5 / 2-way valve (10), the supply line (6) is decoupled from the lifting drive (3), and the lifting drive (3) and the expansion chamber (11) are coupled to one another and to the venting apparatus (12). As a result, an initially fast and then slowed lowering of the current collector is made possible.

Description

[0001] 202413948

[0002] 1

[0003] Description

[0004] Pneumatic drive assembly, pantograph and vehicle

[0005] The invention relates to a pneumatic drive arrangement for pantographs for vehicles, in particular for rail vehicles, comprising a pneumatic lifting drive which is designed to raise a pantograph by converting a pneumatic lifting drive pressure into a lifting force and / or a lifting torque and which can be supplied with compressed air via a supply line, as well as a rapid lowering device for lowering the pantograph by venting the lifting drive.

[0006] Electric vehicles are often supplied with electricity via pantographs, which can be connected to power supply equipment (e.g., overhead lines or conductor rails). For mechanical and electrical contact with the power supply equipment, pantographs on rail vehicles often have contact strips or contact strips. If these contact strips or contact strips are damaged or broken, they can cause damage (e.g., to the power supply equipment) when in contact with it. Therefore, the contact strips or contact strips often have compressed air channels for damage detection. In cases of damage to the contact strips or contact strips resulting in leaks in the air channels, the pantograph's rapid lowering mechanism can be pneumatically triggered due to pressure losses caused by the leaks.The triggered rapid lowering devices enable rapid lowering of the pantographs. For example, the European standard (EN) 50206 describes requirements for the rapid lowering of pantographs.

[0007] Rapid lowering devices for pantographs often feature pneumatically controlled rapid venting valves with diaphragms, which are located on compressed air lines between the pantograph lifting mechanisms and the compressed air supply units for the pantographs. If the air ducts of the pantograph contact strips, into which the monitoring lines of the rapid lowering devices are inserted, are intact, a back pressure on the diaphragm ensures that the rapid venting valves remain closed and the lifting mechanisms are supplied with compressed air.

[0008] However, if the air ducts have leaks (for example due to broken contact strips, etc.), this leads to pressure reductions in the monitoring lines, which opens the diaphragm, vents the lifting drives and thus lowers the pantographs. 202413948

[0009] 2. With such rapid lowering devices, it is often the case that the diaphragms are initially open during the lifting process of the pantographs and only gradually close as counter-pressure builds up. This can cause air loss, which must be taken into account when designing compressed air units (such as compressors), prolonged lifting times of the pantographs, and noise (due to diaphragm fluttering). Furthermore, the material properties of the diaphragm can change adversely due to temperature influences and / or with increasing service life.

[0010] For example, WO 2021 / 028019 A1 is known from the prior art, describing a bellows drive for a pantograph on a rail vehicle and a lowering device coupled to the bellows drive. A pneumatic control valve is arranged on a supply line for the pneumatic control of the bellows drive, which raises the pantograph and applies a contact strip of the pantograph to an overhead line. A 3 / 2-way valve of the lowering device is arranged on the supply line between the control valve and the bellows drive to vent the bellows drive, thereby initiating a lowering process of the pantograph.

[0011] Furthermore, WO 2021 / 122375 A1 shows a pantograph of a rail vehicle, which is mounted on the roof of the rail vehicle via a base frame and support insulators. A linkage of the pantograph is articulated to the base frame and can be raised and lowered by a lifting mechanism. A rocker arm with contact strips is connected to the linkage; these strips can be raised against an overhead line by lifting the linkage and lowered by lowering the linkage.

[0012] The invention is based on the objective of providing a pneumatic drive arrangement for pantographs for vehicles with a rapid lowering device that is further developed compared to the prior art, with which air losses and disturbing noises are avoided and with which a lowering movement of a pantograph can be adjusted as required.

[0013] According to the invention, this problem is solved with a pneumatic drive arrangement according to claim 1, in which the rapid lowering device includes at least a monitoring line connectable to the current collector, a 5 / 2-way valve, a 202413948

[0014] The system comprises an expansion chamber and a venting device, wherein the monitoring line is pneumatically coupled to the supply line and to the 5 / 2-way valve, wherein a connecting line section with a supply throttle valve is arranged between the supply line and the monitoring line, pneumatically connecting the supply line to the monitoring line, wherein in a first operating state of the pneumatic drive arrangement the 5 / 2-way valve is in a first switching position by a pneumatic first line pressure in the monitoring line, in which the stroke drive is pneumatically connected to the supply line, the expansion chamber is pneumatically connected to the venting device via a first connection of the venting device and a second connection of the venting device is blocked.and wherein, in a second operating state of the pneumatic drive arrangement, the 5 / 2-way valve is in a second switching position by a second pneumatic line pressure in the monitoring line, which is smaller than the first line pressure, in which the supply line is pneumatically decoupled from the lifting drive and the lifting drive is pneumatically coupled to each other via the first connection and to the expansion chamber via the second connection, and to the venting device on the other hand.

[0015] The supply throttle valve allows compressed air from a vehicle's compressed air unit to be introduced into the pantograph (e.g., into a contact shoe with an air channel) via the supply line, the connecting line section, and the monitoring line. Depending on the air pressure in the monitoring line, the 5 / 2-way valve can then switch to the first position, allowing the compressed air to be directed to the lifting mechanism via the supply line, thus initiating a lifting action of the pantograph. If, for example, the pantograph is damaged (e.g., the contact shoe breaks) and this causes a leak in the monitoring line, the air pressure in the monitoring line will drop.This allows less compressed air to be supplied to the monitoring line by the supply throttle valve than can escape from the monitoring line into the environment due to leakage. This allows the 5 / 2-way valve to switch to the second switching position, thereby venting the lifting actuator and lowering the current collector.

[0016] The expansion chamber, which can be designed as a buffer volume and whose activation causes an increase in volume, allows the pantograph to be lowered quickly at first and then more slowly during a lowering process initiated by the rapid lowering device. This ensures that, in the event of damage, the pantograph can be quickly removed from a power supply device (e.g., an overhead line). 202413948

[0017] 4 enables and at the same time avoids a sudden arrival of the pantograph in a retracted position.

[0018] In the drive arrangement according to the invention, a pneumatically piloted quick-release valve with a diaphragm, which could, for example, be located on a compressed air line between the lifting drive and a compressed air supply unit for the current collector, can be omitted due to the 5 / 2-way valve and its first and second switching positions. This enables faster lifting of the current collector (since air losses are avoided by eliminating the diaphragm), reduced air consumption for lifting, and improved predictability of the long-term and temperature behavior of components of the drive arrangement (due to the elimination of the diaphragm, which could, for example, be made of an elastomer, etc.). Furthermore, this measure eliminates disruptive noises from the drive arrangement (e.g.,rattling noises due to membrane fluttering or whistling noises caused by escaping compressed air, etc.) are avoided.

[0019] Further advantageous embodiments of the drive arrangement according to the invention are set out in the dependent claims.

[0020] A pressure reduction in a vent line of the venting device is achieved, for example, if the venting device has a venting throttle valve.

[0021] To avoid disturbing noises that may be caused by an airflow escaping through the ventilation device, it may be advisable for the ventilation device to have a silencer.

[0022] A return of the 5 / 2-way valve to a defined switching position using a simple mechanical means is made possible if the 5 / 2-way valve is designed as a spring-return valve.

[0023] This return of the 5 / 2-way valve to the defined switching position can be triggered, for example, when the monitoring line, via whose first line pressure an actuating force can be exerted against a return spring of the 5 / 2-way valve, is vented. A reduced pressure (for example, the second line pressure) can reduce the actuating force, so that, for example, the return spring relaxes and the 5 / 2-way valve moves to the second switching position, etc. 202413948

[0024] 5

[0025] It can be helpful if the quick-lowering device is directly connected to the lifting drive.

[0026] This measure can, for example, reduce the amount of piping required for a pneumatic connection between the rapid lowering device and the lifting drive. Furthermore, this measure allows for a larger air duct cross-section between the rapid lowering device and the lifting drive to be used for venting the lifting drive. Additionally, this improves the response of the rapid lowering device and the repeatability of pantograph lowering operations with regard to specified durations, as long pneumatic lines with potential cross-sectional reductions between the rapid lowering device and the lifting drive can be avoided.

[0027] If the lifting drive is designed as a bellows drive, a structurally simple solution is obtained if the quick-lowering device is directly connected to a bellows cover of the lifting drive.

[0028] Assembly and disassembly of the quick-lowering device are simplified if the quick-lowering device is detachably connected to the lifting drive.

[0029] The quick-lowering device can, for example, be screwed to the lifting drive via the 5 / 2-way valve or a housing of the 5 / 2-way valve, etc.

[0030] Rapid lowering of the pantograph due to damage to the pantograph contact strip is made possible if the monitoring line can be connected to at least one first contact strip of the pantograph.

[0031] The grinding piece can be designed, for example, as a grinding strip, etc.

[0032] A promising field of application for the drive arrangement according to the invention is opened up with a current collector with a pneumatic drive arrangement according to the invention.

[0033] Especially in the case of pantographs for rail vehicles, there is often a need for low-noise and air-consumption-efficient drive arrangements with rapid lowering devices, which, for example, enable a rapid and precise lowering of the pantographs in the event of contact strip breakage.

[0034] Rapid lowering of the pantograph in the event of a contact strip failure is made possible if the pantograph has a movable and operable support device that can be connected to a vehicle, as well as at least one first contact strip which is connected to the 202413948

[0035] 6

[0036] The carrying device is connected and can be attached to and removed from a power supply unit by means of the carrying device, wherein the lifting drive of the pneumatic drive arrangement for raising the pantograph is coupled to the carrying device, wherein the monitoring line of the rapid lowering device of the pneumatic drive arrangement, which is provided for lowering the pantograph by venting the lifting drive, is connected to the at least first contact piece.

[0037] The support device can be designed, for example, as a current collector linkage with a lower arm, an upper arm, a coupling rod, a parallel guide rod, and a rocker arm, etc., and can be connected to a vehicle roof via a base frame, etc. The power supply device can be, for example, an overhead line or a conductor rail, etc. Air pressure in the lifting drive can be converted, for example, into a lifting force and / or a lifting torque, which can be used to actuate the support device, etc.

[0038] Monitoring of the first contact piece (e.g. for a break) without impairing current collection via the first contact piece is made possible if the monitoring line is inserted into the first contact piece and is at least partially sheathed by the first contact piece.

[0039] A promising field of application for the pantograph according to the invention can be opened up with a vehicle with at least one pantograph according to the invention.

[0040] Especially in rail vehicles, pantographs with drive units featuring rapid lowering devices are important because, for example, breaks in contact strips (which can be designed as contact strips) can cause serious damage to the overhead line when they come into contact with it. Repairing this damage can be costly and result in lengthy service disruptions. Such damage, costs, and service disruptions can be avoided with the vehicle according to the invention, which includes an efficient and effective pantograph rapid lowering device. 202413948

[0041] The invention will now be explained in more detail using exemplary embodiments.

[0042] Figure 1 shows, by way of example: A schematic representation of an exemplary first embodiment of a pneumatic drive arrangement according to the invention for a pantograph for a rail vehicle with a rapid lowering device which has a 5 / 2-way valve, and Figure 2: A schematic side view of an exemplary embodiment of a vehicle according to the invention with an exemplary embodiment of a pantograph according to the invention on a roof of the vehicle, wherein contact strips of the pantograph can be applied to and removed from an overhead line by means of an exemplary second embodiment of a drive arrangement according to the invention.

[0043] 202413948

[0044] 8

[0045] Fig. 1 shows a schematic representation of an exemplary first embodiment of a pneumatic drive arrangement according to the invention for a current collector, as shown by way of example in Fig. 2, of which a first contact piece 1 and a second contact piece 2 are also shown schematically in Fig. 1, for a rail vehicle, as also disclosed by way of example in Fig. 2.

[0046] The drive arrangement comprises a pneumatic lifting drive 3, which is designed as a bellows drive and is configured to lift the current collector by converting pneumatic lifting drive pressure into lifting torque. The lifting drive 3 and a support device 4 of the current collector are connected to a pressure-torque converter (not shown in Fig. 1), via which the support device 4 can be actuated. By means of an actuation process of the support device 4 initiated by the lifting drive 3, for example, the first contact strip 1 and the second contact strip 2 can be brought into contact with a power supply unit 5, as shown by way of example in Fig. 2.

[0047] The lifting drive 3 can be supplied with compressed air via a supply line 6, which is connected to a pneumatic supply unit 7 of the rail vehicle. The drive arrangement also includes a rapid lowering device 8 for lowering the pantograph by venting the lifting drive 3.

[0048] The rapid lowering device 8 comprises a monitoring line 9 connected to the first grinding piece 1 and the second grinding piece 2, a 5 / 2-way valve 10 designed as a spring-return valve, a pneumatic expansion chamber 11 designed as a buffer volume, and a venting device 12. The supply line 6 can be pneumatically coupled to the lifting drive 3 via the 5 / 2-way valve 10.

[0049] The quick-lowering device 8 is directly connected to a bellows cover 14 of the lifting actuator 3 via a housing 13 of the 5 / 2-way valve 10, and thus directly to the lifting actuator 3. The housing 13 is flanged to the bellows cover 14 and screwed to it, thereby detachably connecting the quick-lowering device 8 to the lifting actuator 3.

[0050] The monitoring line 9 is pneumatically coupled to the supply line 6 and to the 5 / 2-way valve 10. A pressure-force transducer (not shown in Fig. 1) is arranged between the monitoring line 9 and the 5 / 2-way valve 10, by means of which the 5 / 2-way valve 10 can be actuated and thus moved between switching positions.

[0051] Between supply line 6 and monitoring line 9 is a pneumatically connecting supply line 6 to monitoring line 9 202413948

[0052] 9

[0053] Connecting line section 15 with a supply throttle valve 16 for pressure reduction in the connecting line section 15.

[0054] The 5 / 2-way valve 10 is also connected to the venting device 12 and the expansion chamber 11.

[0055] In a first operating state of the drive arrangement, the 5 / 2-way valve 10 is pressed into a first switching position by a pneumatic first line pressure in the monitoring line 9, which is converted by means of the pressure-force converter into an actuating force on the 5 / 2-way valve 10, by means of which the 5 / 2-way valve 10 is pressed against a return spring 17 connected to the 5 / 2-way valve 10, which is arranged between the 5 / 2-way valve 10 and the housing 13, thereby compressing it, in which the stroke actuator 3 is pneumatically connected to the supply line 6 via a first valve port and a second valve port of the 5 / 2-way valve 10.

[0056] In the first switching position, the expansion chamber 11 is pneumatically connected to the venting device 12 via a first connection 18 of the venting device 12 and via a third valve connection and a fourth valve connection of the 5 / 2-way valve 10.

[0057] A second connection 19 of the venting device 12 is blocked via a fifth valve connection of the 5 / 2-way valve 10.

[0058] If, for example, the first sliding piece 1 and / or the second sliding piece 2 breaks and this break leads to a leak in the monitoring line 9, the pneumatic actuator assembly enters a second operating state. In this second operating state, the 5 / 2-way valve 10 is in a second switching position due to a second pneumatic line pressure in the monitoring line 9, which, due to the leak, is lower than the first line pressure. This causes the actuating force on the 5 / 2-way valve 10 to decrease, resulting in a return force of the return spring 17 that is greater than the actuating force and relaxes the return spring 17. The 5 / 2-way valve 10 is then moved into the second switching position by the return force of the return spring 17.

[0059] In the second switching position, the supply line 6 is pneumatically decoupled from the lifting drive 3. The supply line 6 is blocked via a sixth valve port of the 5 / 2-way valve 10.

[0060] In the second switching position, the lifting drive 3 is also connected via the first connection 18 of the venting device 12 and the expansion chamber 11 via the second connection 19 of the 202413948

[0061] 10

[0062] The venting device 12 is pneumatically coupled to each other on the one hand and to the venting device 12 on the other.

[0063] In the second switching position, the lifting actuator 3 is pneumatically connected to the venting device 12 via a seventh and an eighth valve port of the 5 / 2-way valve 10. The venting device 12 is in turn pneumatically connected to the expansion chamber 11 via a ninth and a tenth valve port of the 5 / 2-way valve 10 in the second switching position.

[0064] The second operating state, in which the 5 / 2-way valve 10 is in the second switching position, is shown in Fig. 1.

[0065] The 5 / 2-way valve 10 has five ports and allows two switching positions. In the first switching position, the first, second, third, fourth, and fifth valve ports represent these five ports; in the second switching position, the sixth, seventh, eighth, ninth, and tenth valve ports represent these five ports.

[0066] The venting device 12 has a vent line with a first vent line section 20, on which the first connection 18 for coupling the venting device 12 to the 5 / 2-way valve 10 is arranged, and a second vent line section 21, on which the second connection 19 for coupling the venting device 12 to the 5 / 2-way valve 10 is arranged. The first vent line section 20 and the second vent line section 21 are connected to each other. This allows the lifting actuator 3 to be pneumatically coupled to the expansion chamber 11 via the venting device 12.

[0067] The venting device 12 further comprises a venting throttle valve 22 and a silencer 23, which are connected to the vent line. The venting throttle valve 22 and the silencer 23 are arranged in an end section of the second vent line section 21, with the silencer 23 being connected to an end of the vent line opposite the 5 / 2-way valve 10.

[0068] According to the invention, it is also conceivable that the venting device 12, for example, has a venting protection device instead of the silencer 23, etc.

[0069] In the second switching position, compressed air from the lifting drive 3 is vented into the environment via the venting throttle valve 22 and the silencer 23, thereby lowering the pantograph. This is because, in the second switching position, the lifting drive 3 is connected to the venting device 12 via the venting throttle valve 22 and the venting device 12. (202413948)

[0070] 11

[0071] Since the expansion chamber 11 is pneumatically coupled, the lowering process of the current collector initially occurs rapidly (due to a rapid increase in volume resulting from the activation of the expansion chamber 11 and a concomitant spontaneous pressure reduction in the lifting drive 3) and gradually slows down. This allows the first contact strip 1 and the second contact strip 2 to be quickly released from the power supply unit 5, and the current collector can then be moved into a retracted position at a moderate lowering speed.

[0072] For example, if, after a repair of the first contact piece 1 and / or the second contact piece 2 on the one hand and the monitoring line 9 on the other, the monitoring line 9 is supplied with compressed air again via the supply unit 7, the supply line 6 and the connecting line section 15, because the pantograph is to be raised again, the actuating force on the 5 / 2-way valve 10 increases again and finally overcomes the restoring force of the return spring 17, thereby returning the 5 / 2-way valve 10 to its first switching position. This also supplies the lifting drive 3 with compressed air again, thereby raising the pantograph.

[0073] Figure 2 shows a schematic side view of an exemplary embodiment of a vehicle according to the invention, designed as a rail vehicle, with an exemplary embodiment of a current collector according to the invention. The current collector comprises an exemplary second embodiment of a pneumatic drive arrangement according to the invention, which is functionally identical to the exemplary first embodiment of a pneumatic drive arrangement according to the invention, as described by way of example in connection with Figure 1.

[0074] The pantograph comprises a support device 4 designed as a movable pantograph linkage, which includes a lower arm 24, an upper arm 25, a top bar 26 with a first guide horn 27 and a second guide horn (not visible in Fig. 2), a parallel guide bar 28, and a coupling bar 29. The lower arm 24 and the coupling bar 29 are pivotally connected to a base frame 30, which is connected to a roof 33 of the rail vehicle via a first support insulator 31, a second support insulator 32, and a third support insulator (not visible in Fig. 2). A pneumatic lifting drive 3 of the drive assembly for raising and lowering the pantograph is provided between the base frame 30 and the lower arm 24. A rapid lowering device 8 of the drive assembly is directly and detachably connected to the lifting drive 3, which is designed as a bellows drive. 202413948

[0075] 12

[0076] The upper arm 25 is articulated with the forearm 24 and with the coupling rod 29, the parallel guide rod 28 is articulated with the forearm 24.

[0077] A current collector arm is mounted on the support device 4, comprising a first contact strip 1 and a second contact strip 2, which are designed as contact strips. The current collector arm is pivotally connected to the apex rod 26 and to the parallel guide rod 28. The first contact strip 1 and the second contact strip 2 are thus connected to the support device 4.

[0078] The first contact piece 1 and the second contact piece 2, which have carbon contact strips not shown in Fig. 2, are, in the state shown in Fig. 2, attached to a power supply unit 5 designed as an overhead line by means of the support device 4, thereby supplying the rail vehicle with electricity. The first contact piece 1 and the second contact piece 2 can be removed from the power supply unit 5 by means of the support device 4.

[0079] The lifting drive 3 is coupled to the carrying device 4 via a pressure-torque converter not shown in Fig. 2, which makes the carrying device 4 operable and allows it to be lifted, for example, by means of the lifting drive 3.

[0080] To rapidly lower the pantograph (for example in the event of a contact break) by venting the lifting drive 3, the drive arrangement has the rapid lowering device 8, the operation of which is described by way of example in connection with Fig. 1.

[0081] An expansion chamber 11 of the rapid lowering device 8, described by way of example in connection with Fig. 1, is connected to the base frame 30. According to the invention, however, it is also possible for the expansion chamber 11 to be connected to another vehicle component.

[0082] A monitoring line 9 of the rapid lowering device 8 is supplied with compressed air via a pneumatic supply unit 7, which is connected to a car body of the rail vehicle and which is pneumatically coupled to the drive assembly via a supply line 6. The lifting drive 3 is also supplied with compressed air via the supply line 6 and the rapid lowering device 8.

[0083] The monitoring line 9 is routed from the rapid lowering device 8 via the lower arm 24 and the upper arm 25 to the first grinding piece 1 and the second grinding piece 2 and is connected to the first grinding piece 1 and the second grinding piece 2. Monitoring line 9 202413948

[0084] 13 is inserted into the first grinding piece 1 and into the second grinding piece 2 and is arranged encased by the first grinding piece 1 and the second grinding piece 2.

[0085] For example, if a grinding wheel breaks and a leak occurs...

[0086] Monitoring line 9, a switching process is triggered in the rapid lowering device 8, which leads to a venting of the lifting drive 3 and thus to a lowering process of the

[0087] leads to current collectors.

[0088] Regardless of the grammatical gender of a particular term, persons with male, female or other gender identities are included.

[0089] 202413948

[0090] Reference symbol list

[0091] 1 First grinding piece

[0092] 2 Second grinding piece

[0093] 3 Lifting drive

[0094] 4 T carrying device

[0095] 5 Power supply unit

[0096] 6 Supply line

[0097] 7 Power supply unit

[0098] 8 Quick-lowering device

[0099] 9 Monitoring line

[0100] 10 5 / 2-way valve

[0101] 11 Expansion Chamber

[0102] 12. Venting device

[0103] 13 cases

[0104] 14 bellows covers

[0105] 15 Connecting line section

[0106] 16 Supply throttle valve

[0107] 17 Return spring

[0108] 18 First connection

[0109] 19 Second connection

[0110] 20 First section of the vent pipe

[0111] 21 Second vent pipe section

[0112] 22 Venting throttle valve

[0113] 23 silencers

[0114] 24 Forearm

[0115] 25 Upper arm

[0116] 26 crown bar

[0117] 27 First horn

[0118] 28 Parallel guide rod

[0119] 29 Coupling rod

[0120] 30 basic frames

[0121] 31 First support insulator

[0122] 32 Second support insulator

[0123] 33 Roof

Claims

202413948 15 Patent claims 1. Pneumatic drive arrangement for pantographs for vehicles, in particular for rail vehicles, comprising a pneumatic lifting drive (3) which is designed to raise a pantograph by converting a pneumatic lifting drive pressure into a lifting force and / or a lifting torque and which can be supplied with compressed air via a supply line (6), and a rapid lowering device (8) for lowering the pantograph by venting the lifting drive (3), characterized in that the rapid lowering device (8) has at least one monitoring line (9) connectable to the pantograph, a 5 / 2-way valve (10), an expansion chamber (11) and a venting device (12), wherein the monitoring line (9) is pneumatically coupled to the supply line (6) and to the 5 / 2-way valve (10).wherein a connecting line section (15) with a supply throttle valve (16) is arranged between the supply line (6) and the monitoring line (9), pneumatically connecting the supply line (6) to the monitoring line (9), wherein in a first operating state of the pneumatic drive arrangement the 5 / 2-way valve (10) is in a first switching position by a pneumatic first line pressure in the monitoring line (9), in which the stroke drive (3) is pneumatically connected to the supply line (6), the expansion chamber (11) is pneumatically connected to the venting device (12) via a first connection (18) of the venting device (12) and a second connection (19) of the venting device (12) is blocked, and wherein in a second operating state of the pneumatic drive arrangement the 5 / 2-way valve (10) is in a first switching position by a pneumatic second line pressure in the monitoring line (9),which is smaller than the first line pressure, is in a second switching position in which the supply line (6) is pneumatically decoupled from the lifting drive (3) and the lifting drive (3) is pneumatically coupled to each other via the first connection (18) and the expansion chamber (11) via the second connection (19) and to the venting device (12) on the other hand.

2. Pneumatic drive arrangement according to claim 1, characterized in that the venting device (12) has a venting line with a first venting line section (20) on which the first connection (18) for coupling the venting device (12) to the 5 / 2-way valve (10) is arranged, and a second venting line section (21) on which the second connection (19) for 202413948 16 The coupling of the venting device (12) with the 5 / 2-way valve (10) is arranged, wherein the first venting line section (20) and the second venting line section (21) are connected to each other.

3. Pneumatic drive arrangement according to claim 1 or 2, characterized in that the venting device (12) has a venting throttle valve (22).

4. Pneumatic drive arrangement according to one of claims 1 to 3, characterized in that the venting device (12) has a silencer (23).

5. Pneumatic drive arrangement according to one of claims 1 to 4, characterized in that the 5 / 2-way valve (10) is designed as a spring-returnable valve.

6. Pneumatic drive arrangement according to one of claims 1 to 5, characterized in that the lifting drive (3) is designed as a bellows drive.

7. Pneumatic drive arrangement according to one of claims 1 to 6, characterized in that the rapid lowering device (8) is directly connected to the lifting drive (3).

8. Pneumatic drive arrangement according to claim 6, characterized in that the rapid lowering device (8) is directly connected to a bellows cover (14) of the lifting drive (3).

9. Pneumatic drive arrangement according to claim 7 or 8, characterized in that the rapid lowering device (8) is detachably connected to the lifting drive (3).

10. Pneumatic drive arrangement according to one of claims 1 to 9, characterized in that in the second operating state of the pneumatic drive arrangement the monitoring line (9) has a leakage.

11. Pneumatic drive arrangement according to one of claims 1 to 10, characterized in that the monitoring line (9) can be connected to at least one first contact piece (1) of the current collector. 202413948 17 12. Current collector with a pneumatic drive arrangement according to one of claims 1 to 11.

13. Current collector according to claim 12, characterized in that the current collector has a movable and operable support device (4) which can be connected to a vehicle, and at least one first contact piece (1) which is connected to the support device (4) and can be attached to and removed from a power supply unit (5) by means of the support device (4), wherein the lifting drive (3) of the pneumatic drive arrangement for raising the current collector is coupled to the support device (4), wherein the monitoring line (9) of the rapid lowering device (8) of the pneumatic drive arrangement, which is provided for lowering the current collector by venting the lifting drive (3), is connected to the at least first contact piece (1).

14. Current collector according to claim 13, characterized in that the monitoring line (9) is inserted into the at least first contact piece (1) and is arranged to be at least partially sheathed by the at least first contact piece (1).

15. Vehicle with at least one pantograph according to one of claims 12 to 14.

Images