Helicopter sleigh anti-skid device suitable for ice and snow road surface and helicopter

Abstract

The invention provides a helicopter sled anti-skid device suitable for ice and snow pavements and a helicopter, and belongs to the technical field of helicopter undercarriage design. One end of a brake sled plate in the device is connected with a main sled plate through an actuating mechanism, and an anti-skid layer is arranged at the bottom of the brake sled plate; one end of the actuating mechanism is rotationally connected to the joint of the brake sled plate, and the other end is connected with the joint of the main sled plate; one end of the telescopic actuating cylinder is matched and connected with the actuating mechanism and is fixed on the joint of the main sled plate, and the other end is connected with the mounting bracket; the auxiliary wheel assembly is arranged at the tail of the brake sledge plate; when the helicopter skates on the ice surface, the telescopic actuating cylinder extends and pushes the actuating mechanism under the pressure supply effect, the actuating mechanism drives the brake sledge plate to move relative to the main sledge plate, the auxiliary wheel assembly is folded upwards, the brake sledge plate is put down, the brake sledge plate anti-skid layer makes contact with the ice surface, and the ground friction force in the skating process is increased; therefore, the helicopter can be effectively stopped when running on an ice and snow road, and the differential brake function can be maintained.

Description

Technical Field

[0001] The invention belongs to the technical field of helicopter landing gear design, and in particular relates to a helicopter sled anti-skid device suitable for ice and snow roads and a helicopter. Background Art

[0002] The biggest difference between helicopters that take off and land in extremely cold environments and conventional helicopters lies in the different operating environments. In extremely cold environments, most take-off and landing sites are covered with ice and snow. When the helicopter moves on the ice and snow surface after landing, the friction coefficient between the wheels and the ice surface decreases exponentially. During the ground taxiing phase of the helicopter, the engagement torque between the wheels and the ground is less than the wheel braking torque, and the wheels will tend to lock. At this time, the helicopter is at risk of losing control of ground movement, which poses a hidden danger to the safety of the helicopter braking on ice and snow surfaces.

[0003] At the same time, differential braking, a common method for helicopter ground turns, is achieved by braking one main wheel while leaving the other unbraked, creating a friction torque difference. Due to the extreme cold and the low coupling coefficient between the wheels and the icy and snowy surface, differential braking is difficult to implement when turning on the ground. This effectively reduces one method for helicopter ground turns. Even with simply increasing tire friction, traditional wheeled landing gear helicopters are susceptible to sinking into floating snow, making effective braking and run-off correction impossible. This poses a significant risk of accidents when operating on icy and snowy surfaces. Summary of the Invention

[0004] In order to solve the technical problem in the prior art that wheeled landing gear helicopters cannot meet the requirements of effective braking and sliding correction, the present invention provides an anti-skid device that can effectively increase the friction between the landing gear and the ground to achieve an anti-skid effect when the helicopter slides on the ice surface, so that the helicopter has the ability to effectively stop and maintain the differential braking function when sliding on ice and snow surfaces. When the helicopter needs to correct its direction, the brake skid is lowered, and the telescopic actuators installed on the left and right landing gears of the helicopter are controlled to output differential loads, thereby controlling the differential friction between the two brake skids installed on the left and right landing gears of the helicopter and the snow or ice surface, so that the brake surfaces at the bottom of the two brake skids and the snow or ice surface generate differential friction resistance, so that the helicopter generates the correction torque required to correct the sliding direction, which is beneficial to the stability of the helicopter's sliding direction. The technical solution is as follows:

[0005] In a first aspect, a helicopter ski anti-skid device suitable for use on icy and snowy surfaces is provided, comprising: a main ski 1, an actuating mechanism 3, a telescopic actuating cylinder 4, a brake ski 2, and an auxiliary wheel assembly 11. The main ski 1 is mounted on the wheel axle of a landing gear 5; one end of the brake ski 2 is connected to the main ski 1 via the actuating mechanism 3, and an anti-skid layer is provided on the bottom of the brake ski 2; one end of the actuating mechanism 3 is rotatably connected to a joint of the brake ski 2, and the other end is connected to a joint of the main ski 1; one end of the telescopic actuating cylinder 4 is matingly connected to the actuating mechanism 3 and fixed to the joint of the main ski 1, and the other end is connected to a mounting bracket 6; the auxiliary wheel assembly 11 is disposed at the rear of the brake ski 2 to prevent the brake ski 2 from colliding with the ground and causing damage when the helicopter lands with its head raised.

[0006] When the helicopter glides on the ice, the telescopic actuator 4 can extend under the action of external pressure, pushing the actuator mechanism 3. The actuator mechanism 3 can drive the brake skid 2 to move relative to the main skid 1, retracting the auxiliary wheel assembly 11 upward and lowering the brake skid 2. The anti-skid layer of the brake skid 2 contacts the ice surface, increasing the ground friction during the sliding process.

[0007] Optionally, the anti-skid layer is a textured, indented friction surface, which can increase the friction resistance between the brake skid and the ice road surface, thereby providing the helicopter with the torque required for braking and correcting deviation.

[0008] Furthermore, the device also includes: a steel cable assembly 7, one end of the steel cable assembly 7 is connected to the fuselage structure, and the other end is connected to the upper rocker arm of the connecting rod structure 8, the lower rocker arm of the connecting rod structure 8 is connected to the fixing pin 9, the fixing pin 9 is inserted into the mounting hole on the brake skid 2 and the mounting hole of the spring plate 10, a rotating shaft is provided below the mounting hole of the spring plate 10, the spring plate 10 is fixed to the brake skid 2, and the auxiliary wheel assembly 11 is installed on the spring plate 10; pulling up the steel cable assembly 7 causes the connecting rod structure 8 to drive the fixing pin 9 to disengage from the mounting hole of the spring plate 10, and the spring plate 10 can rotate upward around the rotating shaft to achieve the purpose of retracting the auxiliary wheel assembly 11 upward, so as not to hinder the lowering action of the brake skid.

[0009] Optionally, the auxiliary wheel assembly 11 includes: an auxiliary wheel support 12, an auxiliary wheel connector 13, a dust cover 14, and an auxiliary wheel 16.

[0010] The auxiliary wheel 16 is installed on the bottom axle of the auxiliary wheel support 12, the auxiliary wheel joint 13 is installed on the top mounting shaft of the auxiliary wheel support 12 and is fixedly connected to the spring plate 10, and the dust cover 14 is installed above the auxiliary wheel joint 13.

[0011] Optionally, the auxiliary wheel connector 13 and the dust cover 14 are fixed to the auxiliary wheel support 12 via nuts 15 .

[0012] Optionally, the steel cable assembly 7 includes: a steel cable 17, a steel cable fixing joint 18, a pipe sleeve 19, a single-ear joint 20, a double-ear joint 21, and a fixing lock wire 22.

[0013] The steel rope 17, the steel rope fixed joint 18 and the single ear joint 20 are connected by interference fit; the single ear joint 20 is connected to the upper end rocker arm of the connecting rod structure 8;

[0014] The double-ear joint 21 is connected to the fuselage structure. The steel rope fixing joint 18 and the double-ear joint 21 are fastened to the pipe sleeve 19 via threads. The double-ear joint 21 is fixed to the joint of the landing gear 5 via the double-ear joint mounting bolt assembly 23. By adjusting the threaded engagement length between the steel rope fixing joint 18 and the double-ear joint 21, the installation length of the steel rope 17 can be changed to achieve the purpose of adjusting the limit position of the sled. The single-ear joint 20 is fixed to the spring plate 10 via the single-ear joint mounting bolt assembly 24.

[0015] The steel rope fixing joint 18 and the pipe sleeve 19 are provided with a fixing lock wire 22 which can limit the relative circumferential rotation of the steel rope fixing joint 18 relative to the pipe sleeve 19.

[0016] Optionally, the fixed lock wire 22 is composed of an outer lock wire arm 26 and an inner lock wire arm 27. The steel rope fixed joint 18 is provided with a steel rope fixed joint groove 28 for placing the inner lock wire arm 27. The pipe sleeve 19 is provided with a steel rope fixed lock wire mounting hole 25. The arm hook of the outer lock wire arm 26 is located in the steel rope fixed lock wire mounting hole 25.

[0017] In a second aspect, a helicopter is provided, comprising any helicopter ski anti-skid device suitable for ice and snow surfaces as described in the first aspect.

[0018] The beneficial effects of the present invention are at least:

[0019] 1. When the helicopter is sliding on the ice, the telescopic actuator can extend under the action of external pressure, pushing the actuator mechanism, which can drive the brake skid relative to the main skid, retracting the auxiliary wheel assembly upward and lowering the brake skid. The anti-skid layer of the brake skid contacts the ice surface, increasing ground friction during the sliding process. The bottom of the brake skid has an anti-skid layer, which can effectively increase the friction between the helicopter and the ice and snow surface during the sliding process.

[0020] 2. The anti-slip layer is a textured, indented friction surface that increases the friction resistance between the brake skid and the ice road surface, providing the torque required for braking and correcting the helicopter.

[0021] 3. Simple structure and high reliability;

[0022] 4. The main ski board, actuating mechanism, telescopic actuator, brake ski board, etc. are all mechanically detachable and connected for easy replacement;

[0023] 5. The steel rope and the steel rope fixed joint are squeezed and deformed by the external force of the machine so that the steel rope and the steel rope fixed joint are fixed together by interference fit, which makes the fixed installation simple;

[0024] 6. By adjusting the threaded length of the steel rope fixing joint and the double-ear joint, the installation length of the steel rope can be changed to achieve the purpose of adjusting the limit position of the sled;

[0025] 7. The fixed lock wire can limit the relative circumferential rotation of the steel rope fixing joint relative to the pipe sleeve, so that the steel rope will not fall out due to the loosening of the steel rope fixing joint;

[0026] 8. The entire steel rope device has few parts and a simple structure;

[0027] 9. The steel rope included in the steel cable assembly is more reliable than the spring rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the helicopter ski anti-skid device of the present invention;

[0029] Figure 2 This is a schematic diagram of lowering the brake skid plate of the present invention;

[0030] Figure 3 This is a schematic diagram of the training wheels of the present invention;

[0031] Figure 4 This is a schematic diagram of the anti-skid layer on the ground of the brake ski board of the present invention;

[0032] Figure 5 This is a diagram showing the composition of the steel cable assembly of the present invention;

[0033] Figure 6 is a cross-sectional view of a steel cable assembly according to the present invention;

[0034] Figure 7 This is a diagram showing the installation of a fixed lock wire according to the present invention;

[0035] Figure 8 This is a detailed diagram of the installation of the fixed lock wire of the present invention;

[0036] Figure 9 This is a schematic diagram of the installation steps of the fixed lock wire of the present invention;

[0037] Figure 10 This is a detailed diagram of the present invention I; Figure 11 This is a schematic diagram of the groove of the steel rope fixed joint of the present invention.

[0038] Among them, 1-main ski board, 2-brake skid board, 3-actuating mechanism, 4-telescopic actuator, 5-landing gear, 6-mounting bracket, 7-steel cable assembly, 8-connecting rod structure, 9-fixing pin, 10-spring plate, 11-auxiliary wheel assembly, 12-auxiliary wheel support, 13-auxiliary wheel joint, 14 dust cover, 15-nut, 16-auxiliary wheel, 17-steel rope, 18 steel rope fixing joint, 19-pipe sleeve, 20-single ear joint, 21-double ear joint, 22-fixed lock wire, 23-double ear joint mounting bolt group, 24-single ear joint mounting bolt group, 25-steel rope fixing lock wire mounting hole, 26-lock wire outer support arm, 27-lock wire inner support arm, 28-steel rope fixing joint groove. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0040] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific arrangement and method proposed below, but rather encompasses any improvements, replacements, and modifications to structures, methods, and devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary ambiguity in the present invention.

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other, and the various embodiments may refer to and quote each other.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] The present invention is based on the design of a sled-type landing gear and combines the design of a landing gear sled device to provide a sled anti-skid device that can effectively solve the problem of helicopters running out of control when used in polar environments while maintaining the helicopter's differential braking function.

[0044] See Figure 1-Figure 2An embodiment of the present invention provides an anti-skid device for a helicopter skid suitable for use on icy and snowy surfaces, comprising: a main skid 1, an actuating mechanism 3, a telescopic actuating cylinder 4, a brake skid 2, and an auxiliary wheel assembly 11. The main skid 1 is mounted on the wheel axle of a landing gear 5; one end of the brake skid 2 is connected to the main skid 1 via the actuating mechanism 3, and an anti-skid layer is provided on the bottom of the brake skid 2; one end of the actuating mechanism 3 is rotatably connected to the joint of the brake skid 2, and the other end is connected to the joint of the main skid 1; one end of the telescopic actuating cylinder 4 is cooperatively connected to the actuating mechanism 3 and fixed to the joint of the main skid 1, and the other end is connected to the mounting bracket 6; the auxiliary wheel assembly 11 is provided at the tail of the brake skid 2 to prevent the brake skid 2 from colliding with the ground and being damaged when the helicopter lifts its head to land; the main skid is mounted on the wheel axle of the landing gear via a metal mounting bracket.

[0045] When the helicopter glides on the ice, the telescopic actuator 4 can extend under the action of external pressure, pushing the actuator mechanism 3. The actuator mechanism 3 can drive the brake skid 2 to move relative to the main skid 1, retracting the auxiliary wheel assembly 11 upward and lowering the brake skid 2. The anti-skid layer of the brake skid 2 contacts the ice surface, increasing the ground friction during the sliding process.

[0046] See Figure 4 The anti-slip layer is a textured, indented friction surface that increases the friction resistance between the brake skid and the ice surface, providing the helicopter with the torque required for braking and correcting deviations.

[0047] In another embodiment, see Figure 3 The device of the present invention also includes: a steel cable assembly 7, one end of the steel cable assembly 7 is connected to the fuselage structure, and the other end is connected to the upper rocker arm of the connecting rod structure 8, the lower rocker arm of the connecting rod structure 8 is connected to the fixing pin 9, the fixing pin 9 is inserted into the mounting hole on the brake sled 2 and the mounting hole of the spring plate 10, a rotating shaft is provided below the mounting hole of the spring plate 10, the spring plate 10 is fixed to the brake sled 2, and the auxiliary wheel assembly 11 is installed on the spring plate 10; pulling the steel cable assembly 7 upward causes the connecting rod structure 8 to drive the fixing pin 9 to disengage from the mounting hole of the spring plate 10, and the spring plate 10 can rotate upward around the rotating shaft to achieve the purpose of retracting the auxiliary wheel assembly 11 upward, so as not to hinder the lowering movement of the brake sled.

[0048] See Figure 3 The auxiliary wheel assembly 11 includes: an auxiliary wheel support 12, an auxiliary wheel connector 13, a dust cover 14, and an auxiliary wheel 16.

[0049] The auxiliary wheel 16 is installed on the bottom axle of the auxiliary wheel support 12, the auxiliary wheel joint 13 is installed on the top mounting shaft of the auxiliary wheel support 12 and is fixedly connected to the spring plate 10, and the dust cover 14 is installed above the auxiliary wheel joint 13.

[0050] See Figure 3The auxiliary wheel joint 13 and the dust cover 14 are fixed to the auxiliary wheel support 12 through nuts 15.

[0051] In order to retract the auxiliary wheel assembly 11 upward, the present invention provides a steel cable assembly 7, see Figure 5 and Figure 6 The steel cable assembly 7 includes: a steel cable 17, a steel cable fixing joint 18, a pipe sleeve 19, a single-ear joint 20, a double-ear joint 21, and a fixed lock wire 22.

[0052] The steel rope 17, the steel rope fixed joint 18 and the single ear joint 20 are connected by interference fit; the single ear joint 20 is connected to the upper end rocker arm of the connecting rod structure 8;

[0053] The double-ear joint 21 is connected to the fuselage structure. The steel rope fixing joint 18 and the double-ear joint 21 are fastened to the pipe sleeve 19 via threads. The double-ear joint 21 is fixed to the joint of the landing gear 5 via the double-ear joint mounting bolt assembly 23. By adjusting the threaded engagement length between the steel rope fixing joint 18 and the double-ear joint 21, the installation length of the steel rope 17 can be changed to achieve the purpose of adjusting the limit position of the sled. The single-ear joint 20 is fixed to the spring plate 10 via the single-ear joint mounting bolt assembly 24.

[0054] The steel rope fixing joint 18 and the pipe sleeve 19 are provided with a fixing lock wire 22 which can limit the relative circumferential rotation of the steel rope fixing joint 18 relative to the pipe sleeve 19.

[0055] Optionally, the steel rope 17 is squeezed by the external force of the machine, and the steel rope 17 is deformed, so that the steel rope 17 and the steel rope fixing joint 18 are interference fixed together. Similarly, the steel rope 17 is squeezed by the external force of the machine, and the steel rope 17 is deformed, so that the steel rope 17 and the single ear joint 20 are interference fixed together.

[0056] See Figure 5 、 Figure 6 、 Figure 7 and Figure 8 The fixed lock wire 22 is composed of an outer lock wire arm 26 and an inner lock wire arm 27. The steel rope fixing joint 18 is provided with a steel rope fixing joint groove 28 for accommodating the inner lock wire arm 27. The pipe sleeve 19 is provided with a steel rope fixing lock wire installation hole 25. The arm hook of the outer lock wire arm 26 is located in the steel rope fixing lock wire installation hole 25. The fixed lock wire 22 can limit the relative circumferential rotation of the steel rope fixing joint 18 relative to the pipe sleeve 19. The specific limiting method is as follows: Figure 7 、 Figure 8 and Figure 9 As shown, use torque to slightly open the lock wire outer arm 26 and the lock wire inner arm 27 that fix the lock wire 22, as shown in FIG. Figure 11 As shown, the inner arm 27 is inserted into the steel rope fixing joint groove 28 of the steel rope fixing joint 18 installed in the pipe sleeve 19, as shown in FIG. Figure 10As shown, the end of the outer arm 26 is inserted into the steel rope fixing lock wire installation hole 25 on the pipe sleeve 19. When the steel rope fixing joint 18 tends to rotate relative to the pipe sleeve 19, the fixing lock wire 22 uses its structural deformation elastic force to stop this tendency, thereby limiting the relative circumferential movement of the steel rope fixing joint 18 relative to the pipe sleeve 19.

[0057] Another embodiment of the present invention further provides a helicopter, including the helicopter ski anti-skid device suitable for ice and snow surfaces provided by the present invention.

[0058] In one embodiment, the following uses a helicopter wheel brake system as an example to analyze the torque of the helicopter ski anti-skid device applicable to icy and snowy surfaces in the present invention to illustrate the role of the present invention in the helicopter braking process:

[0059] On normal land, assuming a helicopter tire-ground friction coefficient of approximately 0.5, a wheel radius of 280 mm, and a vertical load of approximately 36,000 N on a single wheel, the friction (bonding) torque provided by the wheel-ground is calculated to be 5,040 N·m. The dynamic braking torque of the wheel is (3,990 to 4,080) N·m. Therefore, throughout the entire braking process, the ground friction (bonding) force between the wheel and the tire ensures that the helicopter will not slip.

[0060] When a helicopter glides on ice, the bonding coefficient between the wheel tire and the ice surface decreases exponentially, generally not exceeding 0.1. As a result, the friction (bonding) torque that the wheel tire can provide with the ground becomes 1008 N·m, which is much smaller than the average braking torque value of the helicopter wheel brake (3990-4080) N·m. As a result, the helicopter may slip during normal braking. The brake skid designed by the present invention has a contact friction coefficient of 0.8 with the ice surface. The actuating mechanism applies a vertical pressure of 10,000 N to the brake skid, and the system increases the braking torque by 2240 N·m, which can increase the helicopter's friction torque to 3248 N·m, allowing the helicopter to basically meet normal braking requirements on ice.

[0061] The above merely describes the embodiments of the present invention, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Furthermore, any portions not described in detail herein are conventional techniques.

Claims

1. A helicopter sled anti-skid device suitable for ice and snow surfaces, characterized in that: include: A main ski board (1), a brake ski board (2), an actuating mechanism (3), a telescopic actuating cylinder (4), and an auxiliary wheel assembly (11), wherein the main ski board (1) is mounted on the wheel axle position of the landing gear (5); one end of the brake ski board (2) is connected to the main ski board (1) through the actuating mechanism (3), and the bottom of the brake ski board (2) is provided with an anti-skid layer; one end of the actuating mechanism (3) is rotatably connected to the joint of the brake ski board (2), and the other end is connected to the joint of the main ski board (1); one end of the telescopic actuating cylinder (4) is matched with the actuating mechanism (3) and fixed to the joint of the main ski board (1), and the other end is connected to the mounting bracket (6); the auxiliary wheel assembly (11) is arranged at the tail of the brake ski board (2); When the helicopter is sliding on the ice, the telescopic actuator (4) is extended under the action of external pressure, pushing the actuator (3), and the actuator (3) drives the brake ski (2) to move relative to the main ski (1), retracting the auxiliary wheel assembly (11) upward, and lowering the brake ski (2). The anti-skid layer of the brake ski (2) contacts the ice surface, thereby increasing the ground friction during the sliding process.

2. The device according to claim 1, characterized in that The anti-slip layer is a textured, dented friction surface.

3. The device according to claim 1, characterized in that The device further comprises: a steel cable assembly (7), one end of the steel cable assembly (7) is connected to the fuselage structure, and the other end is connected to the upper end rocker arm of the connecting rod structure (8), the lower end rocker arm of the connecting rod structure (8) is connected to the fixing pin (9), the fixing pin (9) is inserted into the mounting hole on the brake skid (2) and the mounting hole of the spring plate (10), a rotating shaft is provided below the mounting hole of the spring plate (10), the spring plate (10) is fixed on the brake skid (2), and the auxiliary wheel assembly (11) is mounted on the spring plate (10); the steel cable assembly (7) is pulled up, so that the connecting rod structure (8) drives the fixing pin (9) to disengage from the mounting hole of the spring plate (10), and the spring plate (10) rotates upward around the rotating shaft, and the auxiliary wheel assembly (11) is retracted upward.

4. The device according to claim 3, characterized in that The auxiliary wheel assembly (11) comprises an auxiliary wheel support (12), an auxiliary wheel joint (13), a dust cover (14), and an auxiliary wheel (16). The auxiliary wheel (16) is mounted on the bottom axle of the auxiliary wheel support (12), the auxiliary wheel joint (13) is mounted on the top mounting shaft of the auxiliary wheel support (12) and is fixedly connected to the spring plate (10), and the dust cover (14) is mounted above the auxiliary wheel joint (13).

5. The device according to claim 4, characterized in that The auxiliary wheel joint (13) and the dust cover (14) are fixed on the auxiliary wheel support (12) through a nut (15).

6. The device according to claim 3, characterized in that The steel cable assembly (7) comprises: a steel cable (17), a steel cable fixing joint (18), a pipe sleeve (19), a single-ear joint (20), a double-ear joint (21), and a fixing lock wire (22). The steel rope (17), the steel rope fixed joint (18), and the single-ear joint (20) are connected by interference fit; the single-ear joint (20) is connected to the upper end rocker arm of the connecting rod structure (8); The double-ear joint (21) is connected to the fuselage structure, the steel rope fixing joint (18) and the double-ear joint (21) are fastened to the pipe sleeve (19) through threads, the double-ear joint (21) is fixed to the joint of the landing gear (5) through a double-ear joint mounting bolt group (23), and the installation length of the steel rope (17) is changed by adjusting the screwing length of the steel rope fixing joint (18) and the double-ear joint (21); the single-ear joint (20) is fixed to the spring plate (10) through a single-ear joint mounting bolt group (24); The steel rope fixing joint (18) and the pipe sleeve (19) are provided with a fixing lock wire (22) capable of limiting the relative circumferential rotation of the steel rope fixing joint (18) relative to the pipe sleeve (19).

7. The device according to claim 6, characterized in that The fixed lock wire (22) is composed of a lock wire outer support arm (26) and a lock wire inner support arm (27); a steel rope fixed joint (18) is provided with a steel rope fixed joint groove (28) for accommodating the lock wire inner support arm (27); a steel rope fixed lock wire mounting hole (25) is provided on the pipe sleeve (19); and an arm hook of the lock wire outer support arm (26) is located in the steel rope fixed lock wire mounting hole (25).

8. A helicopter, characterized in that: The invention comprises the anti-skid device for helicopter sleds suitable for ice and snow surfaces as described in any one of claims 1 to 7.

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