Braking device for braking travel basket of elevator system

Abstract

The invention relates to a braking device (17) for braking a traveling basket (9) of an elevator system (1), comprising: a spring element (21) for applying a spring force to a brake lining (15); the main guide unit (25) is provided with a main guide shell (27) and a main guide piston (29), the main guide piston can move in the main guide shell, and a main guide containing cavity (37) filled with brake fluid (35) is defined by the main guide piston and the main guide shell; a slave unit (39), which has a slave housing (41) and a slave piston (43), which can be moved in the slave housing and which together with the slave housing encloses a slave chamber (47) filled with brake fluid, a reaction force can be applied to the slave piston by enlarging the slave chamber, and the slave piston can be coupled to the brake lining in such a way that the slave piston can be coupled to the brake lining. Causing the reaction force to be transmitted to the brake lining in a direction opposite to the spring force; a hydraulic line (49) which connects the main chamber and the subordinate chamber; an actuator (53) for moving the leading piston; a compensation container (67); and a control valve (61) which can be displaced between a shut-off position and a through-flow position and which has a first connection (63) which is connected to the compensation container and a second connection (65) which is connected to the primary chamber and / or the secondary chamber, the connections being separated from each other in the shut-off position and connected to each other in the through-flow position.

Description

Field of the Invention

[0001] The present invention relates to a braking device for braking a traveling car of an elevator installation. Furthermore, the present invention relates to a method for controlling such a braking device, as well as a control device, a computer program, and a computer-readable medium for performing the method. Furthermore, the present invention also relates to a braking device, a braking structure, and an elevator installation. Background Art

[0002] An elevator installation having a traveling car for transporting persons and / or objects between different floors of a building may be equipped with a hydraulic brake for braking the traveling car. The brake is typically closed by spring force. This results in a clearly audible noise in the traveling car, which affects the riding comfort. The hydraulic brake pump also generates disturbing noise. Summary of the Invention

[0003] Therefore, there is a need for a braking device that can avoid or at least significantly reduce the disturbing noise generated during braking of the traveling car.

[0004] Furthermore, there is a need for a method for controlling the braking device, a corresponding control device, a corresponding computer program, and a corresponding computer-readable medium.

[0005] Furthermore, there is also a need for a corresponding braking structure, a corresponding braking system, and a corresponding elevator installation.

[0006] These needs can be met by the subject matter of the independent claims. Advantageous embodiments are set forth in the dependent claims, the following description, and the drawings.

[0007] A first aspect of the present invention relates to a braking device for braking a traveling basket of an elevator installation. In addition to the traveling basket, the elevator installation further comprises an elevator shaft that interconnects a plurality of floors of a building and vertical rails arranged in the elevator shaft. The traveling basket is supported in the elevator shaft in such a way that it can move between the floors. The traveling basket can be braked by pressing a brake lining (or brake linings) against the rails. The braking device comprises: a spring element designed to exert a spring force on the brake lining such that the brake lining is pressed against the rails; a master unit having a master housing and a master piston, the master piston being displaceably arranged along a master axis in the master housing and together with the master housing enclosing a master chamber filled with brake fluid, the size of the master chamber being associated with the position of the master piston relative to the master axis; a slave unit having a slave housing and a slave piston, the slave piston being movably arranged along a slave axis in the slave housing and together with the slave housing enclosing a slave chamber filled with brake fluid, the size of the slave chamber being associated with the position of the slave piston relative to the slave axis, wherein by increasing the slave chamber, a counterforce for compensating the spring force can be exerted on the master piston, and wherein the slave piston can be coupled to the brake lining in such a way that the counterforce is transmitted to the brake lining in a direction opposite to the spring force; a hydraulic line connecting the master chamber and the slave chamber; an actuator configured to move the master piston along the master axis; a compensating container; a control valve displaceable between a closed position and a flow-through position, the control valve having a first control valve connection connected to the compensating container and a second control valve connection connected to the master chamber and / or the slave chamber, wherein the first control valve connection and the second control valve connection are separated from each other in the closed position and connected to each other in the flow-through position. As long as the shut-off valve is in the closed position, the sum of the master chamber and the slave chamber is constant.

[0008] In order to generate the counterforce, a master cylinder with a linearly movable master piston is used here instead of a hydraulic pump. This avoids the disturbing noise usually caused by hydraulic pumps, especially gear pumps. Compared with such a hydraulic pump, the actuator of the braking device only needs to be activated when the master piston needs to move.

[0009] The spring force can correspond to the braking force required to brake the traveling basket to a stop. In other words, the spring force can be so large that the brake lining is pressed against the rails by the spring force to brake the traveling basket to a stop.

[0010] The braking device can directly control the pressing pressure of the brake lining during normal driving by means of the position of the main piston. For this purpose, the main piston moves accordingly slowly. Preferably, the main housing has a particularly small cross-section relative to its length. The ratio of the length to the cross-section can be, for example, at least 5 to 1, at least 10 to 1 or at least 20 to 1. The advantage of this is that the brake can be closed and / or opened in a controlled manner and thus very quietly. The length corresponds in particular to the stroke by which the main piston can move. The cross-section is characterized in particular by the diameter.

[0011] The hydraulic line enables pressure compensation between the main chamber and the secondary chamber. As long as the control valve is in the closed position, the sum of the main chamber and the secondary chamber is constant. This mainly means that: the volume of the secondary chamber increases in magnitude while the volume of the main chamber decreases, and vice versa. To ensure this, the main chamber can only be connected to the hydraulic line, the secondary chamber can only be connected to the hydraulic line, and the hydraulic line can only be connected to the check valve in addition to being connected to the secondary chamber and the main chamber.

[0012] The control valve can achieve pressure compensation in the flow-through position, specifically, regardless of the position of the main piston in the main housing and the position of the main piston in the secondary housing. The flow-through position is usually the deactivated position, in which the control valve is in the de-energized state. This enables: when the power supply is interrupted (for example, because the switch in the safety circuit of the elevator installation has been opened), a very rapid decompression occurs in the secondary housing, that is, the travel basket is braked accordingly quickly.

[0013] In addition, when the control valve is connected to the compensation container, it can keep the amount of brake fluid in the system constant, which may fluctuate depending on the environmental conditions and / or the tightness of the system.

[0014] The secondary piston can be coupled to the brake lining, for example, by means of a rod that passes through an opening in the secondary housing, and the rod can be firmly connected to the secondary piston at one end. The rod can, for example, have the same outer diameter as the secondary piston or a much smaller outer diameter than the secondary piston.

[0015] The spring element can be arranged at least partially inside the secondary housing and / or at least partially outside the secondary housing.

[0016] The braking device can include different secondary units, the secondary chambers of which are connected to the main chamber of the same main unit. Here, the secondary chambers can be connected in series with each other. The secondary pistons of different secondary units can be coupled to the same brake lining or different brake linings. For example, the secondary units can be accommodated by a robust hydraulic block.

[0017] The second aspect of the present invention relates to a method for controlling the braking device described above in the context. The method includes: when it is recognized that the traveling basket should be braked, by operating the actuator to move the main piston along the main axis in the first direction, so that the main cavity increases, and / or by operating the control valve to adjust the control valve to the flow-through position; and / or when it is recognized that the traveling basket should no longer be braked, by operating the actuator to move the main piston along the main axis in the second direction, so that the main cavity decreases, and by operating the control valve to adjust the control valve to the cut-off position.

[0018] The processes of moving the main piston in the first direction and adjusting the control valve to the flow-through position respectively cause the pressure in the secondary housing to decrease independently of each other, that is, the secondary cavity decreases, and as a result, the reaction force becomes smaller relative to the spring force.

[0019] Conversely, the process of moving the main piston in the second direction combined with adjusting the control valve to the cut-off position causes the pressure in the secondary housing to increase, that is, the secondary cavity increases, and as a result, the reaction force becomes larger relative to the spring force.

[0020] This method can be implemented by a computer and automatically executed by a processor, such as the control device described below.

[0021] The third aspect of the present invention relates to a control device having a processor configured to execute the method described above in the context. The control unit may include hardware modules and / or software modules. In addition to the processor, the control device may further include a memory and a data communication interface for wireless and / or wired data communication with peripheral devices.

[0022] It should be noted that the features of the method, as described above in the context, may also be features of the control device (and vice versa).

[0023] The fourth aspect of the present invention relates to a braking structure. The braking structure includes at least two braking devices as described above in the context. Here, the main units of different braking devices are one and the same main unit. Additionally or alternatively, the actuators of different braking devices are one and the same actuator. Additionally or alternatively, the compensation containers of different braking devices are one and the same compensation container. Such a braking structure with redundant braking circuits can be manufactured particularly inexpensively.

[0024] The fifth aspect of the present invention relates to a braking system. The braking system includes one control device (or multiple control devices) as described above in the context. In addition, the braking system includes one braking device (or multiple braking devices) and / or one braking structure (or multiple braking structures) as described above in the context.

[0025] The braking system can include, for example, a separate control device for each braking device or the same control device for a plurality of braking devices.

[0026] A sixth aspect of the invention relates to an elevator installation. The elevator installation includes: an elevator shaft connecting a plurality of floors of a building to each other; one or more vertical rails (or a plurality of such rails) arranged in the elevator shaft; a traveling basket supported in the elevator shaft in such a way that the traveling basket can travel between floors and can be braked by pressing one or more brake linings against the rails; and the braking system described above.

[0027] Preferably, at least one subordinate housing of the braking system is fixed to the traveling basket. Alternatively or additionally, at least one subordinate housing of the braking system can be fixed to a counterweight coupled to the traveling basket by at least one suspension means.

[0028] One or more rails can be, for example, one or more guide rails for guiding the traveling basket and / or the counterweight along the elevator shaft. For example, the traveling basket can be braked by pressing at least one brake lining against each rail.

[0029] Other aspects of the invention relate to a computer program and a computer-readable medium storing the computer program.

[0030] The computer program includes instructions which, when the computer program is executed by a processor, cause the processor to perform the method described above.

[0031] The computer-readable medium can be a volatile or non-volatile data storage device. For example, the computer-readable medium can be a hard disk, a USB (Universal Serial Bus) storage device, a RAM (Random Access Memory), a ROM (Read-Only Memory), a PROM (Programmable Read-Only Memory), an EPROM (Erasable Programmable Read-Only Memory), an EEPROM (Electrically Erasable Programmable Read-Only Memory), a flash memory or a combination of two or more of these examples. The computer-readable medium can also be a data communication network (for example via the Internet) or a cloud capable of downloading program code.

[0032] It should be noted that the features of the method described above can also be features of the computer program and / or the computer-readable medium (and vice versa).

[0033] Embodiments of the invention can be considered to be based on the following ideas and findings. However, the invention is not limited to these embodiments.

[0034] According to one embodiment, the actuator may include an electric motor having a drive shaft and a transmission for converting the rotation of the drive shaft into the translation of a master piston. Compared with other types of actuators (such as electromagnetic linear actuators), this actuator is particularly cost-effective. In addition, this actuator can also displace the master piston in two directions with particular precision.

[0035] According to one embodiment, the transmission may be a screw drive and / or self-locking. The screw drive may include, for example, a threaded spindle and a spindle nut disposed on the threaded spindle. By rotating the threaded spindle in one direction or the other, the position of the spindle nut in the longitudinal direction of the threaded spindle can be changed. Thus, the master piston can be coupled to the threaded spindle or the spindle nut. Such an actuator may also be referred to as a spindle drive. The self-locking mechanism of the transmission can prevent the master piston from being unnecessarily displaced by an external force. Thereby, for example, the electric motor can be switched off without current, and the master piston is held by the self-locking mechanism so that the master piston does not move.

[0036] However, the actuator can also be designed as an electromagnetic linear actuator, for example in the form of a lifting magnet.

[0037] According to one embodiment, the braking device may further include a check valve having a first check valve connection connected to a compensation container and a second check valve connection connected to the master chamber. The check valve can be designed such that the brake fluid can only flow from the first check valve connection to the second check valve connection. The effect is that when the master chamber increases, a certain amount of brake fluid can flow from the compensation container to the master chamber. In particular, this is independent of whether the control valve is in the closed position or the open position. Such a check valve may also be referred to as a one-way valve.

[0038] According to one embodiment, the second control valve connection can be connected to a hydraulic line. In this way, the second control valve connection is connected to both the master chamber and the slave chamber at the same time. However, the second control valve connection can also be connected to the master chamber and the slave chamber without detouring through a hydraulic line.

[0039] According to one embodiment, the method may further include: determining a maximum adjustment stroke by which the master piston can be maximally displaced in the direction of the master axis; determining whether the maximum adjustment stroke exceeds an allowable adjustment stroke; when the maximum adjustment stroke exceeds the allowable adjustment stroke, identifying that the brake lining has exceeded the wear limit. The maximum adjustment stroke is generally related to the thickness of the brake lining. For example, the thinner the brake lining, the longer the maximum adjustment stroke. Based on the maximum adjustment stroke, it can be determined whether the brake lining has the required minimum thickness. The allowable adjustment stroke may correspond to the thickness of the brake lining in a brand-new state or be a predetermined value less than this thickness.

[0040] According to one embodiment, the method may further include the step of receiving a pressure value representing the pressure with which the brake lining bears against the track. The pressure value may have been provided in the case of using a suitable pressure sensor. In this case, the actuator and / or the control valve may be controlled using the pressure value. This may, for example, cause the actuator to be controlled such that the pressure value approaches a certain rated value.

[0041] According to one embodiment, the method may further include the step of receiving a distance value representing the (vertical) distance between the current position of the traveling cage and the desired position at which the traveling cage should stop. The distance value may have been provided in the case of using a suitable distance sensor. This may, for example, cause the traveling cage to be braked by means of the braking device (in addition to the braking effect generated by the drive motor of the elevator installation) before the traveling cage reaches the desired position. Description of the Drawings

[0042] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the drawings or the following description.

[0043] Figure 1 An elevator installation according to an embodiment of the present invention is shown.

[0044] Figure 2 A braking system according to an embodiment of the present invention is shown, which has two slave units and two master units.

[0045] Figure 3 A braking system according to an embodiment of the present invention is shown, which has two slave units and one master unit.

[0046] The drawings are only schematic and not drawn to scale. If the same reference signs are used in different drawings, these reference signs denote the same or equivalent features. Detailed Description of the Embodiments

[0047] Figure 1 An elevator installation 1 having an elevator shaft 3 is shown, which connects a plurality of floors 5 of a building 7 to each other. In the elevator shaft 3, a traveling cage 9 is supported in such a way that the traveling cage can be moved between the floors 5 by means of a suitable drive. The elevator installation 1 further includes a vertical track 11 (here a guide rail for guiding the traveling cage 9 along the elevator shaft 3) arranged in the elevator shaft 3 and a braking system 13, which is designed to: brake the traveling cage 9 and / or keep the traveling cage stationary by pressing a brake lining 15 (see Figure 2 and Figure 3 ) or simultaneously pressing a plurality of such brake linings 15 against the track 11 (or a plurality of tracks 11).

[0048] To control the pressing force that presses the brake lining 15 against the track 11, the braking system 13 includes a braking device 17 and a preferably electronic control device 19 for controlling the braking device 17. For safety reasons, the braking system 13 may also include a plurality of redundant braking devices 17 (see Figure 2 and Figure 3 ).

[0049] As Figure 2 and Figure 3 shown, the braking device 17 includes a spring element 21 which is designed to exert a spring force on the brake lining 15 such that the brake lining 15 is pressed against the track 11. In this example, the brake lining 15 is mounted on the first side of a plate-like carrier 23, wherein the spring element 21 presses against the second side of the carrier 23 opposite the first side, thereby exerting a spring force on the brake lining 15 through the carrier 23.

[0050] Furthermore, the braking device 17 includes: a master unit 25 which has a master housing 27 and a master piston 29, the master piston being movably arranged along a master axis 33 within the master housing 27 and together with the master housing 27 enclosing a master chamber 37 filled with brake fluid 35, the size of the master chamber being related to the position of the master piston 29 relative to the master axis 33; and a slave unit 39 which has a slave housing 41 and a slave piston 43, the slave piston being movably arranged along a slave axis 45 within the slave housing 41 and together with the slave housing 41 enclosing a slave chamber 47 filled with brake fluid 35, the size of the slave chamber being related to the position of the piston 43 relative to the slave axis 45.

[0051] The master chamber 37 and the slave chamber 47 are interconnected by a hydraulic line 49 such that pressure compensation is achieved between the master chamber 37 and the slave chamber 47. The effect is that when the master chamber 37 decreases, the slave chamber 47 increases and vice versa.

[0052] By increasing the slave chamber 47, a reaction force for compensating the spring force is exerted on the slave piston 43. The slave piston 43 is coupled to the brake lining 15 in such a way that the reaction force is transmitted to the brake lining 15 in a direction opposite to the spring force. This has the effect of reducing the pressing force of the brake lining 15.

[0053] In this example, the slave piston 43 is coupled to the carrier 23 by a rod 51 which passes through an opening in the slave housing 41. The rod 51 is firmly connected to the slave piston 43 at one end and can thus move together with the slave piston 43. By increasing the master piston volume 47, the rod 51 presses against the carrier 23 in a direction opposite to the spring force, thereby reducing the pressing force of the brake lining 15.

[0054] Furthermore, the braking device 17 includes an actuator 53 which is designed to move the main piston 29 along the main axis 33. In the present example, the actuator 53 includes an electric motor 55 which has a drive shaft 57 and a transmission 59 coupled to the drive shaft 57, the transmission being designed to convert the rotation of the drive shaft 57 into a translation of the main piston 29. The transmission 59 can be a screw drive, preferably having a self-locking mechanism. However, the actuator 53 can also be an electromagnetic linear actuator, for example a lifting magnet or a linear motor.

[0055] In order to be able to brake the travel basket 9 quickly enough in an emergency, the braking device 17 includes a control valve 61 which can be shifted between a cut-off position and a flow-through position, the control valve having a first control valve connection 63 and a second control valve connection 65, the first control valve connection and the second control valve connection being separated from each other in the cut-off position and connected to each other in the flow-through position. In the present example, the first control valve connection 63 is connected to a compensation container 67, wherein the second control valve connection 65 is connected to a hydraulic line 49 and thus also to the main chamber 37 and the secondary chamber 47 in this way. However, the second control valve connection 65 can also be connected only to the main chamber 37 or only to the secondary chamber 47, as long as the main chamber 37 and the secondary chamber 47 are interconnected via the hydraulic line 49 to achieve pressure equalization.

[0056] The braking device 17 can also include a check valve 69 having a first check valve connection 71 and a second check valve connection 73. In this case, the check valve 69 can be connected to the compensation container 67 via the first check valve connection 71 and to the main chamber 37 via the second check valve connection 73 in parallel with the control valve 61. The check valve 69 is designed in such a way that the brake fluid 35 can flow from the first check valve connection 71 to the second check valve connection 73, but not in the opposite direction. The effect is that when the pressure in the main housing 27 drops, a certain amount of brake fluid 35 can flow in from the compensation container 67 to supplement the main housing 27, and when the pressure in the main housing 27 increases, the brake fluid 35 can only flow out of the main housing 27 via the hydraulic line 49.

[0057] In Figure 2 In the example shown, the braking system 13 includes a braking structure 75 which includes two identical braking devices 17, the braking devices each having a main unit 25 and a secondary unit 39. Here, the two main pistons 29 are each connected to the same actuator 53, such that the two main pistons can be moved simultaneously along their respective main axes 33 by the actuator 53. Furthermore, the two control valves 61 and the two check valves 69 are connected to the same compensation container 67.

[0058] Different from Figure 2 ​Figure 3 The two braking devices 17 of the braking structure 75 shown do not each have a main unit 25, but rather have the same main unit 25. Here, the two hydraulic lines 49 can be connected to the main housing 27 through separate connection parts, or as Figure 3 shown, through the same connection part to the main housing 27. In the latter case, the two hydraulic lines 49 form a common hydraulic line 49. Different from Figure 3 what is shown, the common hydraulic line 49 can also be connected to the compensation container 67 through only one control valve 61 instead of through two control valves 61 to achieve the same effect as in the case of two control valves 61.

[0059] The spring elements 21 of different braking devices 17 can be designed to apply their respective spring forces to the same brake lining 15 or to different brake linings 15.

[0060] The spring elements 21 of different braking devices 17 can also be one and the same spring element 21.

[0061] The slave pistons 43 of different braking devices 17 can be respectively coupled to the same brake lining 15 or different brake linings 15.

[0062] Preferably, the two braking devices 17 are not coupled to the same rail 11, but rather to different rails 11, for example, respectively coupled to one of the two guide rails for guiding the travel basket 9 along the elevator shaft 3.

[0063] The two braking devices 17 can also form two completely independent, i.e., completely redundant, braking circuits.

[0064] The actuator 53 and the control valve 61 are controlled by the control device 19. In this example, the control device 19 includes a memory 77 and a processor 79, and the processor is configured to execute the following method for controlling the braking device 17 by executing a computer program stored in the memory 77.

[0065] If the control device 19 recognizes that the travel basket 9 should be braked, the control device 19 controls the actuator 53 such that the respective main piston 29 moves along the main axis 33 in a first direction, thereby increasing the respective main cavity 37. The main piston 29 is preferably adjusted in such a way that the brake lining 15 is prevented from hitting the track 11 and possibly generating an uncomfortable noise in the travel basket 9. In particular in an emergency situation, when a braking action has to be applied suddenly, the control device 19 additionally or alternatively to controlling the actuator 53 also controls the respective control valve 61 to move the control valve to the flow-through position. This causes the pressure in the respective secondary housing 41 to drop particularly quickly, such that the respective brake lining 15 is suddenly pressed against the respective track 11 with the spring force required for braking, and the travel basket 9 is braked accordingly quickly.

[0066] In Figure 2 and Figure 3 it is shown that the control valve 61 is in the flow-through position. This corresponds to the emergency situation mentioned above. Thereby, the secondary cavity 47 is suddenly emptied into the compensation container 67. And the spring element 21 quickly presses the brake lining 15 against the track 11.

[0067] Conversely, if the control device 19 recognizes that the travel basket 9 should no longer be braked, the control device controls the respective control valve 61 in such a way that the control valve moves to the cut-off position. Then, the control device controls the actuator 53 in such a way that the respective main piston 29 moves in a second direction opposite to the first direction, whereby the respective main cavity 37 decreases and the pressure in the respective secondary housing 41 increases. Accordingly, the pressing pressure of the respective brake lining 15 decreases.

[0068] If the control device 19 controls the respective control valve 61 to empty the secondary cavity 47, the control device 19 first controls the actuator 53 such that the respective main piston 29 moves in the first direction in order to increase the main cavity 37 from the compensation container 67 to such an extent that the secondary cavity 47 can be filled during the movement.

[0069] The control device 19 can also receive the pressure value 81 representing the pressing pressure and provided by the respective pressure sensor and use it to control the actuator 53 and / or the respective control valve 61, for example in order to adjust the pressing pressure.

[0070] Additionally or alternatively, the control device 19 can receive the distance value 83, which is the distance between the current position of the travel basket 9 and the desired position at which the travel basket 9 should stop. Then, the distance value 83 can be used to control the actuator 53 and / or the respective control valve 61, for example to assist the motor brake.

[0071] The pressure value 81 or the distance value 83, or the pressure value 81 and the distance value 83, can be received in a plurality of successive time steps during the operation of the elevator installation 1, i.e. updated at a certain frequency.

[0072] It is also possible to automatically monitor the thickness of the brake lining 15 using the brake device 17 described above. For this purpose, the control device 19 determines the maximum adjustment stroke of the master piston 29 for the maximum displacement in the direction of the master axis 33 by correspondingly actuating the actuator 53. The maximum adjustment stroke thus determined is then compared with the permitted adjustment stroke, for example stored in the memory 77, which corresponds to the minimum thickness of the brake lining 15. If the maximum adjustment stroke exceeds the permitted adjustment stroke, the control device 19 recognizes that the brake lining 15 is too thin. In this case, the control device 19 generates, for example, a corresponding message prompting the technician to replace the brake lining 15 concerned.

[0073] Finally, it should be noted that terms such as "comprising", "including", "containing" do not exclude other elements or steps, and indefinite articles such as "a" or "an" do not exclude a plurality. It should also be pointed out that features or steps introduced with reference to one of the above-described embodiments can also be used in combination with features or steps introduced with reference to other above-described embodiments. The reference signs in the claims should not be construed as limiting the scope of the subject matter defined by the claims.

Claims

1. A braking device (17) for a traveling basket (9) of a braking elevator device (1), wherein, The elevator installation (1) further comprises an elevator shaft (3) connecting a plurality of floors (5) of a building (7) to one another and a vertical rail (11) arranged in the elevator shaft (3), wherein the travel basket (9) is supported in the elevator shaft (3) in such a way that the travel basket can travel between the floors (5) and can be braked by pressing a brake lining (15) against the rail (11), wherein the braking device (17) comprises: a spring element (21) which is designed to exert a spring force on the brake lining (15) such that the brake lining (15) is pressed against the rail (11); a master unit (25) having a master housing (27) and a master piston (29) which is arranged in the master housing (27) so as to be displaceable along a master axis (33) and together with the master housing (27) encloses a master chamber (37) filled with a brake fluid (35), the size of the master chamber being associated with the position of the master piston (29) relative to the master axis (33); a slave unit (39) having a slave housing (41) and a slave piston (43) which is arranged in the slave housing (41) so as to be displaceable along a slave axis (45) and together with the slave housing (41) encloses a slave chamber (47) filled with a brake fluid (35), the size of the slave chamber being associated with the position of the slave piston (43) relative to the slave axis (45), wherein by increasing the slave chamber (47), a counterforce for compensating the spring force can be exerted on the slave piston (43), and wherein the slave piston (43) can be coupled to the brake lining (15) in such a way that the counterforce is transmitted to the brake lining (15) in a direction opposite to the spring force; a hydraulic line (49) connecting the master chamber (37) to the slave chamber (47); an actuator (53) which is designed to move the master piston (29) along the master axis (33); a compensation container (67); a control valve (61) which can be shifted between a cut-off position and a flow-through position and which has a first control valve connection (63) connected to the compensation container (67) and a second control valve connection (65) connected to the master chamber (37) and / or the slave chamber (47), wherein the first control valve connection (63) and the second control valve connection (65) are separated from one another in the cut-off position and are connected to one another in the flow-through position, characterized in that: when the shut-off valve (61) is in the cut-off position, the sum of the master chamber (37) and the slave chamber (47) remains constant.

2. The braking device (17) according to claim 1, Among them, wherein the actuator (53) comprises an electric motor (55) with a drive shaft (57) and a transmission (59) for converting the rotation of the drive shaft (57) into a translation of the master piston (29).

3. The braking device (17) according to claim 2, Among them, The transmission device (59) is a screw transmission device and / or a self-locking transmission device.

4. The braking device (17) according to any one of the preceding claims, the braking device further comprising: A check valve (69), the check valve having a first check valve connection portion (71) connected to the compensation container (67) and a second check valve connection portion (73) connected to the main chamber (37), wherein the check valve (69) is designed in such a way that the brake fluid (35) can only flow from the first check valve connection portion (71) to the second check valve connection portion (73).

5. The braking device (17) according to any one of the preceding claims, Among them, The second control valve connection portion (65) is connected to the hydraulic pipeline (49).

6. A method for controlling the braking device (17) according to any one of the preceding claims, the method comprising: When it is recognized that the traveling basket (9) should be braked: by manipulating the actuator (53), moving the main piston (29) along the main axis (33) in a first direction so that the main chamber (37) increases, and / or by manipulating the control valve (61) to adjust the control valve (61) to the flow-through position; and / or When it is recognized that the traveling basket (9) should no longer be braked: by manipulating the actuator (53), moving the main piston (29) along the main axis (33) in a second direction so that the main chamber (37) decreases, and by manipulating the control valve (61) to adjust the control valve (61) to the cut-off position.

7. The method according to claim 6, the method further comprising: Determining the maximum adjustment stroke by which the main piston (29) can be maximally displaced in the direction of the main axis (33); Determining whether the maximum adjustment stroke exceeds the allowable adjustment stroke; When the maximum adjustment stroke exceeds the allowable adjustment stroke, identifying that the brake lining (15) has exceeded the wear limit.

8. The method according to claim 6 or 7, the method further comprising: Receiving a pressure value (81), the pressure value representing the pressure of the brake lining (15) pressing against the track (11); Wherein, when using the pressure value (81), manipulating the actuator (53) and / or the control valve (61).

9. The method according to any one of claims 6 to 8, the method further comprising: Receiving a distance value (83), the distance value representing the distance between the current position of the traveling basket (9) and the desired position where the traveling basket (9) should stop; Wherein, when using the distance value (83), manipulating the actuator (53) and / or the control valve (61).

10. A control device (19), the control device comprising a processor (79), the processor being configured to execute the method according to any one of claims 6 to 9.

11. A braking structure (75), the braking structure comprising: At least two braking devices (17) according to any one of claims 1 to 5, Wherein, the main units (25) of different braking devices (17) are one and the same main unit (25) and / or The actuator (53) of different braking devices (17) is one and the same actuator (53) and / or the compensation container (67) of different braking devices (17) is one and the same compensation container (67).

12. A braking system (13), the braking system comprising: the control device (19) according to claim 10; wherein, the braking system (13) further comprises: the braking device (17) according to any one of claims 1 to 5 and / or the braking structure (75) according to claim 11.

13. An elevator device (1), the elevator device comprising: an elevator shaft (3) connecting multiple floors (5) of a building (7) to each other; a vertical track (11) arranged in the elevator shaft (3); a traveling basket (9), the traveling basket being supported in the elevator shaft (3) in such a way that the traveling basket can travel between floors (5) and can brake the traveling basket by pressing a brake lining (15) against the track (11); the braking system (13) according to claim 12.

14. A computer program, the computer program comprising instructions that, when the computer program is executed by a processor (79), cause the processor (79) to execute the method according to any one of claims 6 to 9.

15. A computer-readable medium, on which the computer program according to claim 14 is stored.

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