Helicopter sliding door movement device and sliding door

Abstract

The present invention discloses a helicopter sliding cabin door movement device and a sliding cabin door. The device comprises an upper slide rail arranged on a cabin frame, a lower slide rail arranged on a cabin floor, and a middle slide rail arranged on a main reduction platform; the upper slide rail is connected to the sliding cabin door through an upper pulley assembly, the lower slide rail is connected to the sliding cabin door through a lower pulley assembly, and the middle slide rail is connected to the sliding cabin door through a middle pulley assembly; the opening on the middle slide rail for installing the middle pulley assembly faces outward, the length of the middle slide rail is shorter than that of the upper slide rail and the lower slide rail, and the front end of the middle slide rail has no inner side bending; the opening on the upper slide rail for installing the upper pulley assembly faces downward, and the upper pulley assembly can move up and down in a small range in the upper slide rail; the middle pulley assembly comprises a Z-rotating pulley group, a rocker arm assembly and a fixed steering joint, one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-rotating pulley group, so that the sliding cabin door can slide smoothly and open quickly on the aircraft.

Description

Technical Field

[0001] The invention belongs to the field of helicopter structural design, and in particular relates to a helicopter sliding door movement device and a sliding door. Background Art

[0002] In most helicopter sliding door movement devices, the motion trajectories of the pulley assemblies on the slide rails are set in parallel. The pulley assemblies on each slide rail have the same structure. The slide rails are long and have curved trajectories. The motion trajectories of the slide rails are all the same, and the design is relatively simple.

[0003] For small civilian helicopters, the angles of the cockpit floor and the main reducer platform are different, and the space size of the main reducer platform is limited, so it is necessary to use a slide rail with a short length and no curved track on the main reducer platform. The slide rails on the cockpit floor and the main reducer platform are designed at different angles, so the sliding door movement device cannot be designed in the above-mentioned parallel setting method. Otherwise, it is easy to cause uncoordinated movement between the pulley assemblies and movement jamming.

[0004] Therefore, it is necessary to provide a sliding door movement device to ensure coordinated movement between the pulley assemblies, prevent movement jamming, and ensure smooth movement of the sliding door. Summary of the Invention

[0005] The present invention provides a helicopter sliding door movement device and a sliding door, which are used to solve the problem of movement stagnation caused by different movement trajectories of the slide rails, especially the problem of movement stagnation caused by the short length of the slide rails and the inability to set curved trajectories. The technical solution is as follows:

[0006] In a first aspect, a helicopter sliding door movement device is provided, comprising an upper slide rail provided on a cabin frame, a lower slide rail provided on a cabin floor, and a middle slide rail provided on a main reduction platform;

[0007] The upper slide rail is connected to the sliding door via an upper pulley assembly, the lower slide rail is connected to the sliding door via a lower pulley assembly, and the middle slide rail is connected to the sliding door via a middle pulley assembly;

[0008] The opening on the middle slide rail for mounting the middle pulley assembly faces outward, the middle slide rail is shorter than the upper slide rail and the lower slide rail, and the front end of the middle slide rail has no inner curvature;

[0009] The opening on the upper slide rail for installing the upper pulley assembly faces downward, and the upper pulley assembly can move up and down in a small range within the upper slide rail;

[0010] The middle pulley assembly includes a Z-direction rotating pulley group, a rocker arm assembly and a fixed steering joint, wherein the Z-direction rotating pulley group has the same structure as the Z-direction rotating pulley group of the lower pulley assembly; one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-direction rotating pulley group; one end of the rocker arm assembly can rotate around the fixed steering joint, and the other end can rotate around the Z-direction rotating pulley group.

[0011] Optionally, the front end of the upper slide rail is first bent toward the cabin and then set to a straight section, so that the upper part of the sliding door slides a preset distance toward the cabin along the upper slide rail through the upper pulley assembly and then is fixed in the straight section, thereby limiting the lateral movement of the sliding door.

[0012] Optionally, the upper pulley assembly includes: a transverse wheel, a fixing part such as a bolt, a laterally adjustable bracket and a hatch fixed bent tube bracket; the transverse wheel is fixed to the laterally adjustable bracket and the hatch fixed bent tube bracket through a fixing part, and the hatch fixed bent tube bracket is connected to the sliding hatch; the lower mounting surface of the laterally adjustable bracket is provided with a toothed array structure, which cooperates with the toothed array structure on the hatch fixed bent tube bracket to adjust the lateral position of the upper pulley assembly; the gap between the outer diameter size of the transverse wheel and the upper slide rail is a preset gap to ensure that the upper pulley assembly slides smoothly on the upper slide rail; the tolerance of the light rod area of ​​the fixing part is f9, and it is transitionally matched with the rolling bearing of the transverse wheel.

[0013] Optionally, the transverse wheel includes: a rolling bearing and a lubricating bushing, wherein the lubricating bushing is made of reinforced nylon and is injection-molded into a bushing groove of an outer ring of the rolling bearing through an injection molding process.

[0014] Optionally, the opening on the lower rail for installing the lower pulley assembly faces outward, and the front end of the lower rail bends toward the cabin, so that the lower part of the sliding door slides obliquely along the lower rail toward the cabin for a preset distance through the lower pulley assembly, and there is no straight section at the front end of the lower rail.

[0015] Optionally, the lower pulley assembly includes: a Z-axis rotating pulley set and a toothed double-ear joint.

[0016] Among them, the Z-direction rotating pulley group is hinged to a toothed double-ear joint, the toothed double-ear joint is fixedly connected to the sliding hatch, and the Z-direction rotating pulley group of the lower pulley assembly has the same structure as the Z-direction rotating pulley group of the middle pulley assembly.

[0017] Optionally, the Z-axis rotating pulley assembly includes: a rotatable bogie, two transverse wheels and a vertical wheel,

[0018] Among them, the two transverse wheels are symmetrically arranged at both ends of the vertical wheel; each transverse wheel and vertical wheel is inserted into the rotatable bogie through the mounting shaft, and the fitting tolerance between the mounting shaft and the mounting hole of the rotatable bogie is H8 / f9. The rotatable bogie and the mounting shaft are fixed by pins, and the fitting tolerance between the rotatable bogie and the mounting pin is H10 / f9; a first boss is provided at the connection between the rotatable bogie and the toothed double-ear joint, and the gap between the double-ear joints on the toothed double-ear joint is greater than the height of the first boss; the transverse wheel and the vertical wheel have the same structure as the transverse wheel of the upper pulley assembly.

[0019] Optionally, a rocker arm limiter with adjustable length is provided at the upper front end of the middle slide rail for limiting the inward rotation of the rocker arm assembly when the sliding door is closed;

[0020] The rocker arm limiting device includes: a limiting support and a bolt, wherein a second boss is provided at the front end of the limiting support, and a through hole with an internal thread is provided in the middle of the second boss; the bolt head is a third boss, and flat surfaces are provided at both ends of the third boss for rotation during bolt installation. The bolt can adjust its front and rear position by rotating on the limiting support.

[0021] Optionally, the rocker arm assembly includes: a rocker arm, a first compression spring joint, a second compression spring joint, and a compression spring;

[0022] The rocker arm is provided with three double-ear joints, the first double-ear joint is used to connect to the Z-direction rotating pulley set, the second double-ear joint is used to connect to the first compression spring joint; the third double-ear joint is used to connect to the fixed steering joint;

[0023] One end of the first compression spring joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the double-ear joint hole and the center of the cylindrical shaft are in the same symmetry plane. The cylindrical shaft is provided with a cylindrical hole for the telescopic movement of the second compression spring joint;

[0024] One end of the second compression spring joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the hole on the double-ear joint and the center of the cylindrical shaft are in the same symmetry plane. The compression spring is sleeved on the outside of the cylindrical shaft of the first compression spring joint, and the second compression spring joint is inserted into the cylindrical hole of the first compression spring joint.

[0025] The fixed steering joint includes: an upper ear piece, a middle ear piece, and a lower ear piece. The three ear pieces are parallel to the mounting surface of the middle slide rail. The three ear pieces are provided with coaxial through holes for connecting the third double-ear joint of the rocker arm through a pin shaft.

[0026] The middle ear piece is provided with a through hole for connecting the second compression spring joint, and the line connecting the circular hole center of the through hole and the center of the upper hole of the second double ear joint of the rocker arm is outside the center of the first double ear joint hole of the rocker arm.

[0027] In a second aspect, a sliding door is provided, comprising the helicopter sliding door movement device described in any one of the first aspects.

[0028] The beneficial effects of the present invention are at least:

[0029] The moving device of the present invention has an opening on the middle slide rail for installing the middle pulley assembly facing outward, the length of the middle slide rail is shorter than the upper slide rail and the lower slide rail, and there is no inner bend at the front end of the middle slide rail; the middle pulley assembly includes a Z-axis rotating pulley group, a rocker arm assembly and a fixed steering joint, and the Z-axis rotating pulley group has the same structure as the Z-axis rotating pulley group of the lower pulley assembly; one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-axis rotating pulley group; one end of the rocker arm assembly can rotate around the fixed steering joint, and the other end can rotate around the Z-axis rotating pulley group; it can be realized that a slide rail with a short length and no curved track can be used on the main reduction platform; since the opening on the upper slide rail for installing the upper pulley assembly faces downward, the upper pulley assembly can move up and down slightly in the upper slide rail, so different design angles of the slide rails on the cabin ground and the main reduction platform can be realized; finally, the pulley assemblies move in coordination, and movement jamming is not prone to occur, thereby ensuring the smooth movement of the sliding cabin door. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a helicopter sliding door movement device and the overall structure of the sliding door of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the rocker arm limiting device at the front of the middle slide rail;

[0032] Figure 3 Schematic diagram of the structure of the upper pulley assembly;

[0033] Figure 4 It is a structural diagram of the transverse wheel;

[0034] Figure 5 It is a structural diagram of the lower pulley assembly;

[0035] Figure 6 Schematic diagram of the installation structure of the transverse wheels and vertical wheels and the rotatable bogie;

[0036] Figure 7 Schematic diagram of the structure of the middle pulley assembly;

[0037] Figure 8 Schematic diagram of the rocker arm structure in the middle pulley assembly;

[0038] Figure 9 This is a schematic diagram of the dimensions of the rocker arm double-ear joint in the middle pulley assembly;

[0039] Figure 10 Schematic diagram of the fixed steering joint structure in the middle pulley assembly.

[0040] Among them, 1-sliding door, 2-upper slide rail, 3-upper pulley assembly, 4-lower slide rail, 5-lower pulley assembly, 6-middle slide rail, 7-middle pulley assembly, 8-limit support, 9-first bolt, 10-transverse wheel, 11-second bolt, 12-laterally adjustable bracket, 13-door fixed elbow bracket, 14-rolling bearing, 15-embedded bushing, 16-rotatable bogie, 17-transverse wheel, 18-vertical wheel, 19-toothed double-ear joint, 20-mounting shaft, 21-pin, 22-fixed steering joint, 23-rocker arm, 24-first compression spring joint, 25-second compression spring joint, 26-compression spring, 27-first double-ear joint, 28-second double-ear joint, 29-third double-ear joint, 30-limiting boss, 31-upper ear piece, 32-middle ear piece, 33-lower ear piece. DETAILED DESCRIPTION

[0041] 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.

[0042] 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 set forth 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 some of these specific details. The following description of the embodiments is intended only 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 set forth below, but rather covers any improvements, replacements and modifications of 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 technologies are not shown to avoid unnecessary ambiguity in the present invention. It should be noted that, where there is no conflict, the embodiments of the present invention and the features within the embodiments can be combined with each other, and the various embodiments can be referenced and quoted to each other.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] A helicopter sliding door movement device provided by an embodiment of the present invention includes three slide rails with different motion trajectories connected to the sliding door arranged on the helicopter body structure and their corresponding pulley assemblies; the three slide rail assemblies are respectively arranged on the cabin frame, the cabin floor and the main reduction platform, and the three slide rails are arranged at the top, middle and bottom respectively. The upper and lower slide rails are basically in the same position along the heading, and the front ends of the upper and lower slide rails are bent into the cabin, so that the cabin door moves into the cabin during sliding. Due to the spatial size limitation of the upper main reduction platform, the sliding distance of the middle slide rail is smaller than the upper and lower slide rails, and the front end of the slide rail cannot be bent into the cabin. The three pulley assemblies include an upper pulley assembly, a lower pulley assembly and a middle pulley assembly. The upper pulley assembly is only provided with a fixed transverse wheel, and the lower pulley assembly is provided with a Z-direction rotating pulley assembly and a toothed double-ear joint. The pulley assembly that can rotate about the Z direction includes a rotatable bogie, two transverse wheels and a vertical wheel. The middle pulley assembly includes a Z-direction rotating pulley assembly, a rocker arm assembly and a fixed steering joint. When the sliding door opens, the curved guides of the upper and lower rails and the rotation of the rocker arm of the middle pulley assembly cause the sliding door to slide backward in a coordinated manner. This invention solves the problems of using short, non-curved rails on the main reducer platform, as well as the different design angles of the rails on the cabin floor and the main reducer platform, resulting in uncoordinated movement between the pulley assemblies and stagnation. Tests of the door's onboard installation have demonstrated that it can achieve smooth sliding and rapid opening of the sliding door on the aircraft.

[0045] One embodiment of the present invention provides a helicopter sliding door movement device, comprising an upper slide rail 2 provided on the cabin frame, a lower slide rail 4 provided on the cabin floor, and a middle slide rail 6 provided on the main reduction platform. Figure 1 ;

[0046] Furthermore, the front end of the upper slide rail is first bent into the cabin and then a straight section is provided, so that the upper part of the sliding door 1 first slides 110mm into the cabin and then is fixed in the straight section, limiting the lateral movement of the door. The opening on the upper slide rail for installing the upper pulley assembly 3 faces downward, and the upper pulley assembly 3 can move slightly up and down in the upper slide rail. The front end of the lower slide rail is bent into the cabin, so that the lower part of the sliding door 1 slides obliquely 110mm into the cabin, and there is no straight section at the front end of the slide rail. The opening on the middle slide rail 6 for installing the middle pulley assembly faces outward, and its length is 100mm shorter than the upper slide rail 2 and the lower slide rail 4. In addition, the front end of the middle slide rail 6 cannot be bent inward due to the space limitations of the fuselage.

[0047] Furthermore, an adjustable rocker arm limiter is located at the front upper end of the middle slide rail 6, restricting the inward rotation of the rocker arm assembly when the sliding door is closed. This limiter comprises a limiter support 8 and a first bolt 9. A 6mm thick second boss is located at the front end of the limiter support 8, and a through-hole with an M6 internal thread is located in the center of the second boss. The first bolt 9 has a 30mm cylindrical shaft with a 25mm M6 thread. The bolt head has a 14mm diameter, 5mm thick third boss. Flat surfaces are located at each end of the boss to allow for rotation during bolt installation. The bolt can be adjusted forward and backward by rotating it on the limiter support. (See [Note: The following appears to be unrelated text and may be omitted.]) Figure 2 .

[0048] The upper slide rail 2 is connected to the sliding door 1 through the upper pulley assembly 3, the lower slide rail 4 is connected to the sliding door 1 through the lower pulley assembly 5, and the middle slide rail 6 is connected to the sliding door 1 through the middle pulley assembly 7. Figure 1 ;

[0049] Furthermore, the upper pulley assembly includes: a transverse wheel 10, a second bolt 11, a laterally adjustable bracket 12 and a hatch fixing elbow bracket 13, see Figure 3 The clearance between the outer diameter of the transverse wheel 10 and the slide rail is 0.5mm. The transverse wheel 10 includes a rolling bearing 14 and an embedded bushing 15. The embedded bushing 15 is made of reinforced nylon. A 2mm wide and 1mm deep groove is opened around the rolling bearing 14 for injection molding of reinforced nylon. Figure 4 The tolerance of the bolt polished rod area is f9, which is a transition fit with the rolling bearing. The lower mounting surface of the laterally adjustable bracket is provided with a tooth array, which cooperates with the tooth array on the hatch fixed elbow bracket to adjust the lateral position of the upper pulley assembly. Each tooth can be adjusted by 1mm.

[0050] Furthermore, the lower pulley assembly includes: a Z-axis rotating pulley set and a toothed double-ear joint 19. The Z-axis rotating pulley set includes: a rotatable bogie 16, two transverse wheels 17, and a vertical wheel 18. The gap between the transverse wheel 17 and the vertical wheel 18 and the lower rail is 0.5mm. The transverse wheel 17 and the vertical wheel 18 have the same transverse wheel structure as the transverse wheel of the upper pulley assembly. The two transverse wheels are symmetrically arranged at both ends of the vertical wheel, and the distance between the two transverse wheel axes is 50mm. A first boss is provided at the connection between the rotatable bogie 16 and the toothed double-ear joint 19. The boss height is 10mm. The gap between the two ears on the toothed double-ear joint 19 is greater than the height of the first boss. The gap between the two ears is 11mm. See Figure 5 .

[0051] Furthermore, the transverse wheel 17 and the vertical wheel 18 are inserted into the bogie through the shaft. The diameter of the transverse wheel mounting shaft 20 is Φ6mm, the diameter of the vertical wheel mounting shaft 20 is Φ8mm, and the matching tolerance between the shaft and the bogie mounting hole is H8 / f9. The bogie and the shaft are fixed by the pin 21. The matching tolerance between the bogie and the pin is H10 / f9, and the diameter of the pin is Φ2mm. Figure 6 .

[0052] The middle pulley assembly includes: a Z-axis rotating pulley block, a rocker arm assembly, and a fixed steering joint 22. The Z-axis rotating pulley block has the same structure as the Z-axis rotating pulley block of the lower pulley assembly. One end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-axis rotating pulley block. One end of the rocker arm assembly can rotate around the fixed steering joint 22, and the other end can rotate around the Z-axis rotating pulley block. Figure 7 .

[0053] Furthermore, the rocker arm assembly includes: a rocker arm 23, a first compression spring joint 24, a second compression spring joint 25, and a compression spring 26. The compression spring 26 is sleeved on the outside of the cylindrical shaft of the first compression spring joint 24, and the second compression spring joint 25 is inserted into the cylindrical hole of the first compression spring joint 24. Figure 7 .

[0054] Furthermore, the front end of the rocker arm is provided with a first double-ear joint 27 with a gap of 11mm for connecting the pulley group rotating in the Z direction. The ear piece is 4mm thick. The center of the hole of the first double-ear joint 27 is 8mm away from the rear end of the rocker arm and 10mm away from the side end of the rocker arm; the front end of the rocker arm is also provided with a limiting boss 30 parallel to the end of the double-ear joint. The local height of the limiting boss 30 is 4mm higher than the double-ear joint and the width is 15mm; a second double-ear joint 28 connected to the first compression spring joint is arranged 56mm away from the rear end of the rocker arm. The ear piece is 2mm thick, the gap between the double-ear joint 2 is 14mm, and the center of the hole of the second double-ear joint 28 is 20mm away from the side end of the rocker arm. A third double-ear joint 29 connected to the fuselage joint is provided 130mm away from the rear end of the rocker arm. The ear piece is 4mm thick, the gap is 26mm, and the center of the hole of the third double-ear joint 29 is 37mm away from the side end of the rocker arm. Figure 8 and Figure 9 .

[0055] Furthermore, the first compression spring joint has a double-ear joint at one end and a cylindrical shaft at the other end. The gap between the double-ear joint is 8 mm, the thickness of the ear piece is 2 mm, the distance from the center of the connecting hole on the double-ear joint to the end of the cylindrical shaft is 48 mm, the center of the hole and the center of the cylindrical shaft are on the same symmetry plane, the length of the cylindrical shaft is 40 mm, and a cylindrical hole with a length of 20 mm and a diameter of Φ6H8 is set from the end of the cylindrical shaft for the telescopic movement of the second compression spring joint.

[0056] Furthermore, the second compression spring joint has a double-ear joint at one end and a cylindrical shaft at the other end. The gap between the double-ear joint is 6 mm, the thickness of the ear piece is 2 mm, the distance from the center of the connecting hole on the double-ear joint to the end of the cylindrical shaft is 29.5 mm, the center of the hole and the center of the cylindrical shaft are in the same symmetry plane, the length of the cylindrical shaft is 20 mm, and the diameter of the cylindrical shaft is Φ6h7.

[0057] Furthermore, the compression spring material is music wire G1, with a wire diameter of 2.6mm, a spring outer diameter of 14mm, 12.5 effective turns, and a free height of 54mm. When the second compression spring joint is extended and retracted to its limit, the distance between the compression spring pressing surface on the first compression spring joint and the compression spring pressing surface on the second compression spring joint is 41mm, and the compression spring is compressed by 13mm.

[0058] According to the spring stiffness , where G is the elastic modulus of the music wire, which is 70,000 MPa, and d is the diameter of the music wire, which is 2.6 mm. N is the number of turns, which is 12.5. D is the mean diameter of the compression spring, which is the outer diameter minus the wire radius, which is 14 - 1.3 = 12.7 mm. Using the formula, we know that k = 17.6 N / mm.

[0059] According to the compression spring force calculation formula F=kx, k is the stiffness of the compression spring, and x is the compression distance. It can be seen that when the first compression spring joint and the second compression spring joint are compressed to the limit position, F=17.6N / mm×13mm=228.8N. The manual pushing force specified in GJB2873 is between 187N and 231N. The pressure value generated by the compression spring is reasonably designed, which can simultaneously achieve the goal that the compression spring can generate corresponding damping when the sliding door is closed and the resistance generated by the compression spring can be overcome by pushing by hand.

[0060] Furthermore, the fixed steering joint includes an upper lug 31, a middle lug 32, and a lower lug 33. The three lugs are parallel to the mounting surface of the middle slide rail. The gap between the upper and lower lugs is 34mm, with a tolerance of -0.15 to 0. The thickness of the upper and lower lugs is 4mm, and the thickness of the middle lug is 6mm, with a tolerance of -0.15 to 0. The lower surface of the middle lug is 20mm away from the upper surface of the lower lug. A Φ8H8 through-hole is drilled in all three lugs for connecting to the third double-lug joint of the rocker arm via a pin. The connecting pin has a diameter of 6mm. A separate Φ5H8 through-hole is drilled in the middle lug for connecting to the second compression spring joint. The line connecting the center of the Φ5 circular hole in the middle lug and the center of the upper hole of the second double-lug joint of the rocker arm is outside the center of the hole in the first double-lug joint of the rocker arm (see [Note: The Φ5H8 hole is not provided in the original text]). Figure 10 .

[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 sliding door movement device, characterized in that: It includes an upper slide rail arranged on the cockpit frame, a lower slide rail arranged on the cockpit floor, and a middle slide rail arranged on the main reduction platform; The upper slide rail is connected to the sliding door via an upper pulley assembly, the lower slide rail is connected to the sliding door via a lower pulley assembly, and the middle slide rail is connected to the sliding door via a middle pulley assembly; The opening on the middle slide rail for mounting the middle pulley assembly faces outward, the middle slide rail is shorter than the upper slide rail and the lower slide rail, and the front end of the middle slide rail has no inner curvature; The opening on the upper slide rail for installing the upper pulley assembly faces downward, and the upper pulley assembly can move up and down in a small range within the upper slide rail; The middle pulley assembly includes a Z-direction rotating pulley block, a rocker arm assembly, and a fixed steering joint, wherein the Z-direction rotating pulley block has the same structure as the Z-direction rotating pulley block of the lower pulley assembly; one end of the rocker arm assembly is hinged to the fixed steering joint, and the other end is hinged to the Z-direction rotating pulley block; one end of the rocker arm assembly can rotate around the fixed steering joint, and the other end can rotate around the Z-direction rotating pulley block; The front end of the upper slide rail is first bent inwards and then set to a straight section, so that the upper part of the sliding door slides inwards along the upper slide rail for a preset distance through the upper pulley assembly and then is fixed in the straight section, limiting the lateral movement of the sliding door; The opening on the lower rail for installing the lower pulley assembly faces outward, and the front end of the lower rail is bent inward, so that the lower part of the sliding door slides obliquely along the lower rail toward the cabin for a preset distance through the lower pulley assembly. There is no straight section at the front end of the lower rail; A rocker arm limiting device with adjustable length is set at the upper end of the front part of the middle slide rail to limit the inward rotation of the rocker arm assembly when the sliding door is closed.

2. The device according to claim 1, characterized in that The upper pulley assembly includes: a transverse wheel, a fixing part, a laterally adjustable bracket and a hatch fixed bent pipe bracket; the transverse wheel is fixed to the laterally adjustable bracket and the hatch fixed bent pipe bracket through the fixing part, and the hatch fixed bent pipe bracket is connected to the sliding hatch; the lower mounting surface of the laterally adjustable bracket is provided with a toothed array structure, which cooperates with the toothed array structure on the hatch fixed bent pipe bracket to adjust the lateral position of the upper pulley assembly; the gap between the outer diameter of the transverse wheel and the upper slide rail is a preset gap to ensure that the upper pulley assembly slides smoothly on the upper slide rail; the tolerance of the light rod area of ​​the fixing part is f9, and it is transitionally matched with the rolling bearing of the transverse wheel.

3. The device according to claim 2, characterized in that The transverse wheel comprises a rolling bearing and a lubricating bushing. The lubricating bushing is made of reinforced nylon and is injection molded into the bushing groove of the outer ring of the rolling bearing through an injection molding process.

4. The device according to claim 1, characterized in that The lower pulley assembly includes: a Z-axis rotating pulley block and a toothed double-ear joint. Among them, the Z-direction rotating pulley group is hinged to a toothed double-ear joint, the toothed double-ear joint is fixedly connected to the sliding hatch, and the Z-direction rotating pulley group of the lower pulley assembly has the same structure as the Z-direction rotating pulley group of the middle pulley assembly.

5. The device according to claim 4, characterized in that The Z-axis rotating pulley assembly includes: a rotatable bogie, two transverse wheels and a vertical wheel. Among them, the two transverse wheels are symmetrically arranged at both ends of the vertical wheel; each transverse wheel and vertical wheel is inserted into the rotatable bogie through the mounting shaft, and the fitting tolerance between the mounting shaft and the mounting hole of the rotatable bogie is H8 / f9. The rotatable bogie and the mounting shaft are fixed by pins, and the fitting tolerance between the rotatable bogie and the mounting pin is H10 / f9; a first boss is provided at the connection between the rotatable bogie and the toothed double-ear joint, and the gap between the double-ear joints on the toothed double-ear joint is greater than the height of the first boss; the transverse wheel and the vertical wheel have the same structure as the transverse wheel of the upper pulley assembly.

6. The device according to claim 1, characterized in that The rocker arm limiting device includes: a limiting support and a bolt, wherein a second boss is provided at the front end of the limiting support, and a through hole with an internal thread is provided in the middle of the second boss; the bolt head is a third boss, and flat surfaces are provided at both ends of the third boss for rotation during bolt installation. The bolt can adjust its front and rear position by rotating on the limiting support.

7. The device according to claim 1, characterized in that The rocker arm assembly includes: a rocker arm, a first compression spring joint, a second compression spring joint, and a compression spring; The rocker arm is provided with three double-ear joints, the first double-ear joint is used to connect to the Z-direction rotating pulley set, the second double-ear joint is used to connect to the first compression spring joint; the third double-ear joint is used to connect to the fixed steering joint; One end of the first compression spring joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the double-ear joint hole and the center of the cylindrical shaft are in the same symmetry plane. The cylindrical shaft is provided with a cylindrical hole for the telescopic movement of the second compression spring joint; One end of the second compression spring joint is a double-ear joint, and the other end is a cylindrical shaft. The center of the hole on the double-ear joint and the center of the cylindrical shaft are in the same symmetry plane. The compression spring is sleeved on the outside of the cylindrical shaft of the first compression spring joint, and the second compression spring joint is inserted into the cylindrical hole of the first compression spring joint. The fixed steering joint includes: an upper ear piece, a middle ear piece, and a lower ear piece. The three ear pieces are parallel to the mounting surface of the middle slide rail. The three ear pieces are provided with coaxial through holes for connecting the third double-ear joint of the rocker arm through a pin shaft. The middle ear piece is provided with a through hole for connecting the second compression spring joint, and the line connecting the circular hole center of the through hole and the center of the upper hole of the second double ear joint of the rocker arm is outside the center of the first double ear joint hole of the rocker arm.

8. A sliding door, characterized in that: The helicopter sliding door movement device comprises any one of claims 1 to 7.

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