Emergency brake device for a winch with a cable drum rotatable about a rotary axis, winch and method for operating an emergency brake device

Description

State of the art

[0001] The invention relates to an emergency braking device for a cable winch with a cable drum rotatable about a pivot axis, a cable winch and a method for operating an emergency braking device according to the preamble of the independent claims.

[0002] Cable winches are used in the rescue sector, for example, in conjunction with helicopters as rescue winches, which typically meet a WASA "Loss of HEC" requirement. US 5904229 A1 concerns a braking arrangement used as an automatically activated emergency brake for, among other things, lifting platforms and elevators.

[0003] Against this background, the approach presented here introduces an improved emergency braking device for a cable winch with a cable drum rotatable about a pivot axis, an improved cable winch, and an improved method for operating an emergency braking device according to the main claims. The measures listed in the dependent claims enable advantageous further developments and improvements of the device specified in the independent claim.

[0004] The approach presented here describes an emergency braking device that can be designed to decelerate a falling load, such as a person hanging from a rope, to a standstill without any additional energy input. It can also prevent jerky braking. This allows, for example, the maximum force acting on the rope to be reduced until a standstill is reached. Thus, a suddenly increasing force acting on the rope can be mitigated.

[0005] An emergency braking device for a cable winch with a cable drum rotatable about a pivot axis is presented. The emergency braking device includes a braking unit configured to decelerate the cable drum when a translational force acts on the braking unit. The emergency braking device also includes a driver that is rotatable about the pivot axis and linearly movable along the pivot axis. This driver is configured to engage a driver contour of the cable drum in an active state of the emergency braking device, thereby transmitting a rotational movement of the cable drum to the driver. Furthermore, the device includes an adjuster with a thread and a connecting structure. The adjuster and the driver are connected via the connecting structure in a rotationally fixed manner and linearly movable along the pivot axis.The thread engages with a mating thread in order to cause a linear movement of the feeder towards the brake unit through the rotary motion transferred from the driver to the feeder, in order to exert the translational force on the brake unit.

[0006] The emergency braking device can be described, for example, as a one-time brake that is activated in emergencies, such as an uncontrolled descent, and can therefore be safety-relevant. The emergency braking device can be located, for example, on a helicopter with a winch, such as a rescue helicopter. The winch can be designed to unwind a cable, allowing, for example, people and, additionally or alternatively, objects to be lifted or lowered. The cable can be wound around the cable drum for this purpose. In the inactive state of the emergency braking device, the drive mechanism can be decoupled from the cable drum so that the movement of the cable drum is not impeded by the emergency braking device. For example, the drive mechanism can be held away from the cable drum in the inactive state using a restraint device.In the active state, the drive element can be pressed against the drive element using a spring. The drive element can, for example, be screwed towards the cable drum using the thread and mating thread, thereby exerting the translational force on the brake unit. The mating thread can be fixed. For example, the mating thread can be fixed to a housing of the winch or a structure. The mating thread can thus be decoupled from the rotation of the cable drum, allowing the cable drum to rotate relative to the mating thread. The brake unit can decelerate the cable drum using the translational force, which can thus act as a braking force. Advantageously, a magnitude of the translational force can be related to a torque acting on the cable drum, caused, for example, by a falling load.Thus, the translational force can depend on the rotational speed of the rope drum, ensuring that the translational force is always sufficient to brake the rope drum. Advantageously, the drive element can engage positively with the drive element's contour, allowing these two components to be firmly connected.

[0007] The emergency braking device can be designed for various applications where rotating objects need to be stopped (emergency stop). Thus, the aforementioned cable drum represents a rotating part that can be stopped by the emergency braking device.

[0008] According to one embodiment, the feeder can have a retaining collar with the connecting structure and a receiving section for receiving a spring unit, wherein the spring unit can be secured in an inactive state of the emergency braking device. The spring unit can be unlocked in the active state of the emergency braking device to allow the drive element to be pressed into the drive element contour along the axis of rotation. The connecting structure can therefore be implemented in the retaining collar, for example as a through-opening or a recess. The receiving section can be designed as a niche-like recess so that the spring unit fits into it. Advantageously, the unlocked spring unit can effect the linear movement of the drive element to connect it to the cable drum in a rotationally fixed manner.

[0009] For example, the drive pin can be held in place by a cable, such as a steel cable, when the emergency braking device is inactive. The cable can counteract a pre-tensioned wave spring, which, if the cable were to break, could press the drive pin against the cable drum.

[0010] According to one embodiment, the emergency braking device may include a trigger that can be configured to release the spring unit. The trigger can be activated, for example, manually by a user or automatically, such as when a rotational speed of the cable drum is exceeded. For example, the trigger may include a pyrotechnic device that destroys a restraint device used to hold back the drive pin. For example, a cable used to hold back the drive pin can be severed using the trigger. Advantageously, the emergency braking device can be described as a safety component that can be configured to protect persons.

[0011] According to one embodiment, the brake unit can comprise a brake disc and a brake pad, wherein the brake disc can be shaped to be pressed against the brake pad using translational force in order to brake the rope drum. Advantageously, the translational force can depend on the rotational speed and additionally or alternatively on the falling load, i.e., the person hanging from the rope, so that the rope drum can be braked.

[0012] Furthermore, the pusher can be shaped to press the brake disc against the brake pad. This means that the brake disc can be pressed onto the brake pad, and the resulting frictional force can slow down and ultimately stop the rotation of the cable drum.

[0013] According to one embodiment, the brake lining can be rigidly connected to the cable drum. For example, the brake lining can be shaped as an annular extension of the cable drum.

[0014] The brake unit can include a brake assembly comprising the brake disc, a mounting bracket, and an additional spring unit positioned between the brake disc and the mounting bracket. Using this additional spring unit prevents the cable drum from stopping abruptly. This makes the braking process more comfortable for a person hanging from the cable, as the spring unit softens the braking effect.

[0015] According to the invention, the driver has at least one projection designed to engage with the driver contour. The projection can, for example, be referred to as a retaining element and can, for example, be shaped as a tooth that engages with the driver contour. The driver contour forms at least one ramp. Advantageously, this prevents the driver from engaging with the driver contour when the cable drum rotates in a direction that engages the cable.

[0016] Furthermore, a cable winch with a cable drum rotatable around a pivot axis and with an emergency braking device in a previously mentioned variant is presented.

[0017] The winch can advantageously be designed for rescue helicopters, such as those used in mountainous or underwater environments. The cable drum can be advantageously shaped to wind up a rescue rope and, additionally or alternatively, to unwind it. For this purpose, the cable drum can be movably mounted around the axis of rotation.

[0018] Furthermore, a method for operating an emergency braking device in a previously mentioned variant is presented. The method comprises a step of engaging the driver in the driver contour of the cable drum to transmit the rotary motion of the cable drum to the driver, a step of transmitting the rotary motion from the driver to the feeder, a step of causing the linear movement of the feeder towards the braking unit by the engagement of the thread in the mating thread and by the rotary motion transmitted from the driver to the feeder, and a step of exerting a translational force on the braking unit by means of the linear movement of the feeder in order to decelerate the cable drum using the braking unit.

[0019] The method advantageously allows the winch to be secured for emergencies, so that the cable drum can be braked and brought to a standstill using the emergency braking device in the event of, for example, an uncontrolled abseiling.

[0020] According to one embodiment, the method can include a step of unlocking the emergency braking device using a trigger to enable the engagement of the follower in the follower contour. For example, the emergency braking device can be activated by the unlocking step.

[0021] Examples of the approach presented here are shown in the drawings and explained in more detail in the following description. It shows: Fig. 1 a schematic sectional view of a cable winch with an emergency braking device according to an exemplary embodiment; Fig. 2a schematic sectional view of an exemplary embodiment of a cable winch; Fig. 3 a schematic representation of a driver according to an exemplary embodiment; Fig. 4 a schematic representation of a rope drum with a drive contour according to an exemplary embodiment; Fig. 5 a schematic sectional view of an exemplary embodiment of an arrangement of a delivery person and a follower; Fig. 6 a schematic sectional view of a section of an emergency braking device according to an exemplary embodiment; Fig. 7 a schematic representation of a brake pad according to an exemplary embodiment; Fig. 8 a schematic representation of a spring-mounted brake disc according to an exemplary embodiment; Fig. 9 a schematic representation of an embodiment of a spring-mounted brake disc; and Fig. 10 a flowchart of an exemplary embodiment of a method for operating an emergency braking device.

[0022] In the following description of favorable embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and acting similarly, without repeating these elements.

[0023] Fig. 1Figure 1 shows a schematic sectional view of a winch 100 with an emergency braking device 102 according to an exemplary embodiment. The winch 100 is, for example, arranged in or on a helicopter, such as a rescue helicopter. According to this exemplary embodiment, the winch 100 is shown in a longitudinal section and has the emergency braking device 102 as well as a rotating part, for example in the form of a cable drum 104. The cable drum 104 is designed, for example, to wind or unwind a cable and is therefore rotatable about a pivot axis 106. Although the invention is described here with reference to a winch 100, the emergency braking device 102 can also be used to brake other rotating parts, for example, a rotating machine part of a machine. In such a case, the cable drum 104 can, for example, be considered a section of a shaft.

[0024] The emergency braking device 102, also referred to as an arrestor, comprises a brake unit 108, a driver 110, and a feeder 112. The brake unit 108 is designed to decelerate the cable drum 104 when a translational force acts upon it. The brake unit 108, or at least parts thereof, are arranged, or can be arranged, on a housing. The driver 110 is rotatable about the axis of rotation 106 and linearly movable along the axis of rotation 106.

[0025] The driver 110 is designed to engage with a driver contour of the cable drum 104 in an active state of the emergency braking device 102, also referred to as a braking state, in order to transmit a rotational movement of the cable drum 104 to the driver 110. The driver 110 is also rotationally fixed to the actuator 112 and linearly connected along the axis of rotation 106, i.e., movably in the direction of the cable drum 104. For this purpose, the actuator 112 has a thread 114 and a connecting structure 116. The actuator 112 is coupled to the driver 110 via the connecting structure 116, which is, for example, shaped as a through-hole. The thread 114 engages with a fixed mating thread 118, which is decoupled from any rotation of the cable drum 104. A torque transmitted from the cable drum 104 via the driver 110 to the thread 114 thus leads to a rotation of the thread 114 in the mating thread 118.This results in a linear movement of the feeder 112 towards the rope drum 104 and thus towards the brake unit 108, which allows the translational force to be exerted on the brake unit 108. This means that the emergency braking device 102 screws in using the thread 114 and the mating thread 118 when a load, for example a person hanging from a rope, falls. The emergency braking device 102, more precisely the brake unit 108, absorbs the load, which acts as a translational force on the brake unit 108, and stops the rotational movement.

[0026] Advantageously, energy from a rotating part, for example the cable drum 104, is absorbed via the thread 114 and the mating thread 118 and used to brake the rotating part. If the thread 114 and the mating thread 118 are designed to be stiff, energy from the rotating part can already be converted into heat energy via the thread 114 and the mating thread 118, thus already braking the rotating part somewhat.

[0027] According to one embodiment, the feeder 110 has an annular retaining collar 120 on which the connecting structure 116 is arranged or integrated. According to another embodiment, the feeder 112 has a receiving section 122 designed to receive a spring unit 124. The spring unit 124 is further secured in the inactive state of the emergency braking device 100 and unlocked in the active state of the emergency braking device 100 to press the driver 110 into the driver contour along the axis of rotation 106. Optionally, the emergency braking device 100 has a release mechanism designed to unlock the spring unit 124. The release mechanism is actuated, for example, manually by a user or mechanically, for example, when the rotational speed of the rope drum 104 is exceeded. For example, the release mechanism includes a pyrotechnic device used to release the pre-tensioned driver 110.After the release of the driver 110, an unintentional unwinding of the rope from the rope drum 104 can be reliably prevented by using the emergency braking device 102.

[0028] According to one embodiment, the brake unit 108 comprises a brake disc 126 and a brake pad 128. The brake disc 126 is shaped to act on the brake pad 128 using translational force. In other words, the brake disc 126 is pressed against the brake pad 128, and the resulting frictional force slows the rotation of the cable drum 104. According to this embodiment, the actuator 112 is shaped to press the brake disc 126 against the brake pad 128. This is achieved, for example, by means of a connection between the actuator 112 and the brake unit 108 in the area of ​​the retaining collar 120. Overall, the brake unit 108 is designed in a ring-like form according to this embodiment. According to another embodiment, the brake disc 126 is decoupled from the rotation of the cable drum 104 and therefore does not rotate with it.The brake pad 128, on the other hand, is rigidly coupled to the cable drum 104 and rotates accordingly with the cable drum 104. According to one embodiment, the brake disc 126 is coupled to a further spring unit 130, which is designed to at least partially counteract the translational force in order to prevent the cable drum 104 from stopping abruptly. Instead, the use of the further spring unit 130 results in a comparatively gentle braking action, so that, for example, the cable and the person are protected during the braking process. In other words, the spring force acts against the translational force.

[0029] According to one embodiment, the emergency braking device 102 is designed as an arrestor, meaning an emergency brake, without an energy storage device. The emergency braking device 102 is designed to stop the cable drum 104 if the cable unwinds uncontrollably. Optionally, the cable drum 104 is implemented as a direct winder or, for example, as a capstan winch and is brought to a standstill by means of the emergency braking device 102. The use of the rotational energy of the cable drum 104 and the falling load ensures that the corresponding braking pressure, described here as translational force, is generated for each falling load, until a standstill or stop occurs.

[0030] In other words, this is a brake that uses the energy of the rotating cable drum 104 to close via the thread 114. The frictional engagement is created by the energy of the rotating cable drum 104 and the falling load, and is thus sufficient to bring the cable drum 104, and consequently the falling load, to a standstill. The brake is designed as a one-time-use brake. It cannot be easily opened, making it suitable or feasible as a safety element.

[0031] According to one embodiment, the spring-loaded driver 110 is brought into engagement with the driver structure and released, for example, by means of a trigger. This initiates the rotation. The driver 110 then transmits the rotation to the feeder 112, with the driver 110 and feeder 112 being rotationally fixed to each other. Since the feeder 112 has the thread 114 on the axis of rotation 106, also referred to as the axis of rotation, and the mating thread 118 is fixed with respect to the rotation of the feeder 112, this rotation results in a translation of the feeder 112.

[0032] The translation pushes the non-rotating brake disc 126, which is spring-mounted to prevent the braking force from increasing too suddenly and excessively, against the brake pad 128 on the cable drum 104. The further the cable drum 104 rotates, the greater the pressing force between the braking surfaces, described here as the brake disc 126 and the brake pad 128. The frictional engagement between the brake disc 126 and the brake pad 128 brings the cable drum 104 to a standstill.

[0033] Fig. 2 Figure 1 shows a schematic sectional view of an exemplary embodiment of a cable winch 100. The in Fig. 2 The illustrated winch 100 has at least partially the emergency braking device 102, wherein the winch 100 and therefore also the emergency braking device of the Fig. 1The described winch 100 is at least similar. According to this embodiment, the emergency braking device 102 is shown without the previously described feeder. Instead, according to this embodiment, the direction of action of the movement 200 of the feeder 110 towards the cable drum 104 is symbolically shown. According to this embodiment, fastening elements 202, for example screws or rivets, are also shown, which are designed, for example, to attach the feeder to the spring unit 124. By way of example, the spring unit 124 is designed as a wave spring. The feeder 110 also has a stabilizing structure 204, by which the feeder 110 is, for example, stabilized in its position.

[0034] Fig. 3 Figure 1 shows a schematic representation of a driver 110 according to an exemplary embodiment. The driver 110 corresponds, for example, to the one in at least one of the Figures 1 to 2The described driver 110. According to this embodiment, it is illustrated that the driver 110 is essentially ring-shaped. Furthermore, according to this embodiment, the driver 110 has at least one projection 300, more precisely two opposing and identically shaped projections 300. The at least one projection 300 is designed to engage with the driver contour. The projection 300 also has an elongated through-opening 302. Furthermore, according to this embodiment, the driver 110 has a first retaining section 304, a second retaining section 306 opposite the first retaining section 304, a third retaining section 308 arranged between the first retaining section 304 and the second retaining section 306, and a fourth retaining section 310 opposite the third retaining section 308.The first retaining section 304 and the second retaining section 306 are optionally designed identically. Furthermore, the third retaining section 308 and the fourth retaining section 310 are optionally designed identically. According to this embodiment, the first and second retaining sections 304, 306 each have an engagement opening 312. In contrast, the third and fourth retaining sections 308, 310 each have a receiving opening 314, which is, for example, shaped to allow a fixing element to be inserted or screwed in.

[0035] Fig. 4 Figure 1 shows a schematic representation of a rope drum 104 with a drive contour 400 according to an exemplary embodiment. The rope drum 104 shown here corresponds, for example, to the one in one of the Figures 1 to 2 described rope drum 104. The driver contour 400 is shaped, for example, such that the projections of the driver, as they are, for example, in Fig. 3as described, they engage with it. The driver contour 400, for example, functions as a rail in which the driver rotates a maximum of 180° until it encounters a stop edge 402 of the driver contour 400. Optionally, the driver contour 400 also has a further stop edge 404, which is arranged opposite the stop edge 402. In the area of ​​the stop edge 402, the driver contour 400 is formed in a stepped manner and slopes down from there until it encounters the further stop edge 404. The further stop edge 404 is therefore implemented analogously to the stop edge 402, so that the further stop edge 404 is also formed in a stepped manner. Overall, the number of stop edges 402, 404 on the driver contour 400 corresponds to the number of projections on the driver.

[0036] According to the invention, the drive contour 400 is ramp-shaped. By way of example, the drive contour 400 forms at least one, here two, ramps 406. The ramp-like shape of the drive contour 400 allows continuous rotation of the rope drum 104 in one direction, even when the drive engages the rope drum 104. This allows the rope drum 104 to be rotated for retrieving the rope even when the emergency brake device is activated. In the opposite direction of rotation, however, the rotation of the rope drum 104 is very quickly stopped by the engagement of the drive and the resulting activation of the brake unit.

[0037] Fig. 5 Figure 1 shows a schematic sectional view of an embodiment of an arrangement of a feeder 112 and a driver 110. The driver 110 corresponds, for example, to the one in one of the Figures 1 to 3 The described carrier 110 and the delivery person 112 correspond, for example, to the one in Fig. 1 The described feeder 112. Here too, the spring unit 124 is arranged in the receiving area 122 of the feeder 112, by which the driver 110 is pressed into the driver contour of the cable drum. The driver 110 and the feeder 112 are again connected to each other via the retaining collar 120, which has the connecting structure 116. Here too, the thread 114 is arranged on the feeder 112, which engages in the mating thread 118. According to this embodiment, a section 500 is marked, which is described in more detail in the following figure.

[0038] Fig. 6 Figure 1 shows a schematic sectional view of section 500 of an emergency braking device according to an exemplary embodiment. Section 500 is shown enlarged and corresponds, for example, to the section shown in Figure 2. Fig. 5The aforementioned section 500. Section 500 corresponds to a contact area in which the driver 110 contacts the feeder 112 and the feeder 112 contacts the thread 114. Furthermore, the thread 114 is arranged such that it can engage with the mating thread 118 and thus engages with the mating thread 118. The thread 114 rotates intermittently, i.e., from the activation of the emergency braking device by the driver engaging the cable drum until the cable drum comes to a standstill. The mating thread 118, on the other hand, is fixed, i.e., specifically, stationary with respect to the rotation of the cable drum. This allows a screwing movement of the feeder 112 and / or the driver 110 to be used with the braking unit, as is the case, for example, in Fig. 1 It was described how to stop the rotational movement of the rope drum.

[0039] Fig. 7Figure 1 shows a schematic representation of a brake lining 128 according to an exemplary embodiment. According to this embodiment, the brake lining 128 is arranged on the cable drum 104, which, according to this embodiment, is at least partially hollow. According to this embodiment, the brake lining 128 is arranged in an annular shape around the drive contour 400. This means that the brake lining 128 has a larger diameter than the drive structure 400. For example, the cable drum 104 and the brake lining 128 are formed in one piece. Alternatively, the brake lining 128 is attached to the cable drum 104.

[0040] Fig. 8 Figure 1 shows a schematic representation of a brake assembly 826 with a spring-mounted brake disc 126 according to an exemplary embodiment. The brake disc 126 corresponds, for example, to the one shown in Figure 1. Fig. 1described brake disc 126. According to this embodiment, the additional spring unit 130 is designed as part of the brake assembly 826 between a receptacle 830 and the brake disc 126. More precisely, the additional spring unit 130 is arranged on the rear side of a braking surface 800 of the brake disc 126, which, during a braking process, presses against the Fig. 7The brake pad shown is pressed. According to one embodiment, the brake disc 126 has at least one, here two, retaining elements on its rear side at the receptacle 830, which are implemented differently. A first retaining element 802 is pin-shaped, and a second retaining element 804 is shaped as a receptacle, so that, for example, rotational movement of the brake assembly 826 and thus of the brake disc 126 is prevented. According to this embodiment, the brake disc 126 and the receptacle 830 are ring-shaped. According to one embodiment, the spring unit 130 has a plurality of springs distributed between the receptacle 830 and the brake disc 126. For example, coil springs are used as springs.

[0041] The mounting 830 and the brake disc 126 are coupled to each other via the spring unit 130 and via a plurality of bolts that provide a rotational fixation. For example, the bolts are attached to the brake disc 126 and the free ends of the bolts are received by the mounting contours of the mounting 830.

[0042] When the feeder is moved translationally due to the relative movement between the thread and mating thread as described, the feeder, according to one embodiment, exerts the activation force on the receptacle 830 and displaces the receptacle 830, and thus the entire brake assembly 826, towards the cable drum. As soon as the brake disc 126 contacts the cable drum, the springs of the spring unit 130 are compressed during further movement of the receptacle 830 towards the cable drum. This causes the braking torque exerted on the cable drum via the brake disc 126 to initially increase slowly. By appropriately designing the spring unit 130, which can also be referred to as a spring assembly, the rate at which the braking effect of the emergency braking device increases can be controlled.

[0043] Fig. 9 Figure 1 shows a schematic representation of an embodiment of a spring-mounted brake disc 126. The brake disc 126 is at least similar to the one shown in Figure 1. Fig. 8 The brake disc 126 described above is shown here only from the rear. In this embodiment, the receptacle 830 also optionally includes the retaining elements 802 and 804. In this embodiment, the brake disc 126 has only two spaced-apart first retaining elements 802, which are pin-like, and the second retaining element 804. The retaining elements 802 and 804 are designed to be rotationally restricted and free to move.

[0044] Fig. 10 The diagram shows a flowchart of an embodiment of method 1000 for operating an emergency braking device. Method 1000 is carried out, for example, for an emergency braking device such as those found in at least one of the Figures 1 to 2The method 1000 comprises a step 1002 of engagement, a step 1004 of transmission, a step 1006 of inducing, and a step 1008 of exertion. In step 1002, engagement, the driver engages with the driver contour of the rope drum to transmit the rotational movement of the rope drum to the driver. In step 1004, transmission, the rotational movement is transmitted from the driver to the feeder. In step 1006, inducing, the linear movement of the feeder towards the brake unit is caused by the engagement of the thread with the mating thread and by the rotational movement transmitted from the driver to the feeder. In step 1008, exertion, a translational force is exerted on the brake unit by the linear movement of the feeder to decelerate the rope drum using the brake unit.

[0045] The procedure 1000 optionally includes a further step 1010 of unlocking the emergency braking device using a trigger before step 1002 of engagement, in order to cause the follower to engage with the follower contour. For example, a rope used to restrain the follower is cut. Subsequently, the follower is moved, for example by a pre-tensioned spring, towards the cable drum in order to engage with the cable drum.

Claims

1. Emergency braking device (102) for a winch (102) having a spool (104) rotatable about a rotation axis (106), the emergency braking device (102) comprising: a braking unit (108) configured to decelerate the spool (104) when a translational force acts on the braking unit (108); an engaging unit (110) rotatable about the rotation axis (106) and linearly movable along the rotation axis (106), and configured to engage with an engaging contour (400) of the spool (104) in an active state of the emergency braking device (102), in order to transmit rotation of the spool (104) to the engaging unit (110); and a closing unit (112) having a thread (114) and a connecting structure (116), with the closing unit (112) and the engaging unit (110) being connected via the connecting structure (116) so as to be rotationally fixed and linearly movable along the rotation axis (106), and wherein the thread (114) engages with a mating thread (118) to effect a linear movement of the closing unit (112) in the direction of the braking unit (108) by means of the rotation transmitted from the engaging unit (110) to the closing unit (112), in order to exert the translational force on the braking unit (108), characterised in that the engaging unit (110) comprises at least one protrusion (300) configured to engage with the engaging contour (400), wherein the engaging contour (400) forms at least one ramp (406).

2. Emergency braking device (102) according to claim 1, wherein the closing unit (112) comprises a retaining collar (120) with the connecting structure (116) and a receiving portion (122) for receiving a spring unit (124), wherein the spring unit (124) is locked in an inactive state of the emergency braking device (102), and wherein the spring unit (124) is unlocked in the active state of the emergency braking device (102) to push the engaging unit (110) along the rotation axis (106) into the engaging contour (400).

3. Emergency braking device (102) according to claim 2, comprising a trigger configured to unlock the spring unit (124).

4. Emergency braking device (102) according to one of the preceding claims, wherein the braking unit (108) includes a brake disc (126) and a brake pad (128), wherein the brake disc (126) is pushed against the brake pad (128) using the translational force, in order to decelerate the spool (104).

5. Emergency braking device (102) according to claim 4, wherein the brake pad (128) is rigidly connected to the spool (104).

6. Emergency braking device (102) according to one of claims 4 to 5, wherein the braking unit (108) comprises a brake package (826) including the brake disc (126), a receptacle (830) and a further spring unit (130) arranged between the brake disc (126) and the receptacle for preventing the spool (104) from jerking to a stop.

7. Winch (100), comprising: an emergency braking device (102) according to one of the preceding claims; and the spool (104), which is rotatable about the rotation axis (106).

8. Method (1000) of operating an emergency braking device (102) according to one of claims 1 to 6, the method (1000) comprising the steps of: engaging (1002) the engaging unit (110) with the engaging contour (400) of the spool (104), in order to transmit the rotation of the spool (104) to the engaging unit (110); transmitting (1004) the rotation from the engaging unit (110) to the closing unit (112); effecting (1006) the linear movement of the closing unit (112) in the direction of the braking unit (108) by engaging the thread (114) with the mating thread (118) and by means of the rotation transmitted from the engaging unit (110) to the closing unit (112); and exerting (1008) a translational force on the braking unit (108) by the linear movement of the closing unit (112), in order to decelerate the spool (104) using the braking unit (108).

9. Method (1000) according to claim 8, comprising a step (1010) of unlocking the emergency braking device (102), in order to make the engaging unit (110) engage with the engaging contour (400).