A wind turbine blade transport device adapted to complex road conditions

Abstract

This invention provides a wind turbine blade transport device adapted to complex road conditions, comprising a trailer body, a fixing device, a rotating device, and a supporting device. The fixing device and rotating device are located at the front end of the trailer body. Combined with the tilting bracket at the front of the trailer body, the trailer head and the fixing device are controlled collaboratively through the meshing of internal and external gears. This structure allows for adjustment of the blade's attitude angle during installation. Furthermore, when encountering complex road conditions during transport, the angle can be adjusted by driving and starting a hydraulic cylinder to adapt to changes in road conditions. Additionally, the rotating inner support, bearing outer ring, and supporting device in the rotating device ensure that the blade is firmly fixed at its root, effectively preventing lateral or longitudinal displacement during transport and providing all-around support for the blade. This evenly distributes the fixing force on the blade, avoiding damage caused by localized stress concentration.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade transportation technology, and in particular to a wind turbine blade transportation device adapted to complex road conditions. Background Technology

[0002] Currently, with the trend towards larger blades, wind turbine blades are all made of high-strength / high-rigidity and lightweight glass fiber / carbon fiber reinforced composite materials. In response to the environmental and economic demands for low carbon and high efficiency, 100-meter-class wind turbine blades have become the mainstream in the market. However, the excessive length and weight make the blade structure more sensitive to local stress. In addition, the road conditions during blade transportation are complex (mountainous areas, curves, bumpy roads), with limited space for maneuver and frequent obstacles along the way. When the turning radius is insufficient or the road is narrow, the blade is very likely to collide with the obstacle. All of these factors combined lead to a surge in the risk of damage during blade transportation.

[0003] The current large composite material wind turbine blade transportation equipment lacks size adaptability. Most existing transportation equipment is suitable for blades of 80 meters and below, and lacks effective support solutions for ultra-long blades of 100 meters and above. This indirectly leads to an increased risk of stress concentration during the transportation of large blades. At the same time, the transportation equipment has poor adaptability to different scenarios. Existing equipment is still focused on standard road conditions. When facing complex transportation scenarios such as large turning radii, high obstacle avoidance, and steep mountain slopes, its ability to adapt to terrain is weak. These pain points seriously restrict the safe and efficient transportation of ultra-long blades.

[0004] In view of this, the inventor has designed a wind turbine blade transport device that is adapted to complex road conditions, and this invention is thus derived. Summary of the Invention

[0005] To solve the above problems, the technical solution of the present invention is as follows:

[0006] A wind turbine blade transport device adapted to complex road conditions includes a trailer body and a support device. The trailer body includes a cab and a body, and the support device is used to support the tail section of the blade. The device also includes:

[0007] Trailer body, including the cab and the body;

[0008] A fixing device is fixed to the front end of the vehicle body. The fixing device includes two starting hydraulic cylinders, a first fixing plate and a tilting bracket. The front end of the vehicle body is connected to the bottom of the first fixing plate by internal and external gears. One end of the two starting hydraulic cylinders is connected to the upper end of the tilting bracket and the other end of the two starting hydraulic cylinders is connected to the first fixing plate.

[0009] The rotating device includes a rotating inner support, a bearing outer ring, and a second fixing plate. One side of the second fixing plate is connected to the flipping bracket, and the other side is connected to the bearing outer ring. The rotating inner support is used to fix the blade root.

[0010] Preferably, the rotating device further includes a motor, a connecting gear, a transmission gear, and a reduction gear. The motor is located at the top of the flipping bracket. The connecting gear, transmission gear, and reduction gear are fixed from top to bottom to one side of the flipping bracket near the second fixed plate and mesh with each other. The output shaft of the motor is connected to the connecting gear by a key. One end of the rotating inner support is provided with a gear, and the reduction gear meshes with the rotating inner support.

[0011] Preferably, the first fixed plate has a slider at its center, the movable plate has a fixed block at its center, and a shock-absorbing swing rod connects the fixed block and the slider.

[0012] Preferably, the first fixed plate has a flip support platform in the middle, and the flip bracket is connected to the flip support platform through a rotating shaft.

[0013] Preferably, a limiting boss is provided between the first fixing plate and the flipping bracket.

[0014] Preferably, the support device includes a blade support, a lower wing plate, a leading edge of an upper wing plate, and a trailing edge of an upper wing plate. The upper left and right sides of the blade support are respectively connected to clamping hydraulic cylinders. The leading edge of the upper wing plate and the top of the trailing edge of the upper wing plate are respectively connected to the other end of the clamping hydraulic cylinders. The lower wing plate is fixed to the bottom of the support. The leading edge of the upper wing plate and the two sides of the trailing edge of the upper wing plate are hinged to the lower wing plate by pins.

[0015] Preferably, shock-absorbing buffer membranes are provided inside the leading edge of the upper wing plate, the trailing edge of the upper wing plate, and the panel of the lower wing plate.

[0016] Preferably, the support device further includes an angle iron support, a movable plate, and a base plate. The movable plate is elastically connected to the angle iron support via a sliding rod and a return spring, and the movable plate is elastically connected to the base plate.

[0017] Preferably, a compression spring and a support spring are respectively installed on the bottom and side wall of the base plate, and the movable plate and the base plate are elastically connected by the compression spring and the support spring.

[0018] Preferably, the vehicle body includes a front slide rail, a rear slide rail, and a sliding plate. The front slide rail and the rear slide rail are slidably connected. The sliding plate is slidably disposed above the front slide rail and the rear slide rail. The support device is fixed above the sliding plate.

[0019] The technical solution provided by this invention has the following beneficial effects:

[0020] 1. This invention features a fixing device and a rotating device at the front of the vehicle body. Combined with the tilting bracket at the front of the vehicle body, the trailer head and the fixing device are controlled by the meshing of internal and external gears, enabling the fixing device to rotate relative to the trailer head. This structure allows for adjustment of the blade's attitude angle during wind turbine blade installation. Furthermore, when encountering complex road conditions during transport, the angle can be adjusted by driving two hydraulic cylinders to adapt to changes in road conditions. Additionally, the combination design of the rotating inner support and bearing outer ring in the rotating device, along with the support device, ensures that the blade is firmly fixed at its root, effectively preventing lateral or longitudinal displacement during transport. This provides all-around support for the blade, evenly distributing the fixing force on the blade and avoiding damage caused by localized stress concentration.

[0021] 2. This invention, by incorporating a shock-absorbing buffer membrane compression spring, a support spring, and a shock-absorbing swing rod in the support device, forms a spring-damped shock absorption system. This system effectively absorbs the instantaneous impact energy generated by the vibration of the transport trailer under complex road conditions, significantly reducing the peak impact load borne by the transported component (large composite blade), thus reducing the risk of blade damage during transportation. At the same time, it effectively avoids the phenomenon of local fiber delamination or resin cracking at the bonding points of the blade skin, significantly improving the reliability of the clamp connection in the transport equipment. Attached Figure Description

[0022] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0023] in:

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the fixing device structure in this invention;

[0026] Figure 3 This is a left view of the fixing device and the rotating device in this invention;

[0027] Figure 4 This is a schematic diagram of the rotating device structure in this invention;

[0028] Figure 5 This is a left view of the rotating device in this invention;

[0029] Figure 6 This is a schematic diagram of the support device structure in this invention;

[0030] Figure 7 yes Figure 6A magnified view of area B shown;

[0031] Figure 8 This is the left view of the support device in this invention.

[0032] Label Explanation:

[0033] Trailer cab and body (1); fixing device (2); first fixing plate (201); rotating shaft (201a-1); tilting support platform (201a-2); collar (202a-1); upper starting hydraulic cylinder (202a-2); lower starting hydraulic cylinder (202a-3); tilting bracket (203); fixing bolt (204); electric motor (205a-1); gear cover (205a-2); connecting gear (205a-3); transmission gear (205a-4); reduction gear (206); fastening bolt (207); limiting boss (208); second fixing plate (209); power supply box (210) ; Rotating device (3); Rolling element (301); Rotating inner support (302); Inner ring of bearing (303); Outer ring of bearing (304); Support device (4); Blade support (401); Clamping hydraulic cylinder (402); Trailing edge of upper wing plate (403); Lower wing plate (404); Leading edge of upper wing plate (405); Shock-absorbing buffer membrane (406a-1); Angle iron support (406a-2); Slide spring (406a-3); Slide rod (406a-4); Movable plate (407); Compression spring (408); Movable plate support spring (409); Slider (410); Shock-absorbing swing rod (411); Base plate (412). Detailed Implementation

[0034] To make the technical problems, solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0035] Please see Figures 1 to 8 This is a preferred embodiment of the wind turbine blade transport device adapted to complex road conditions, comprising:

[0036] Trailer body 1, including the cab and the body;

[0037] The fixing device 2 is fixed to the front end of the vehicle body. The trailer head 1 and the chassis of the fixing device 2 are connected by internal and external gears.

[0038] The fixing device 2 includes two starting hydraulic cylinders, a first fixing plate 201, and a tilting bracket 203. The front of the vehicle is connected to the bottom of the first fixing plate 201 by internal and external gears. The telescopic ends of the two starting hydraulic cylinders are connected to the upper end of the tilting bracket 203, and the fixed ends of the two starting hydraulic cylinders are connected to the first fixing plate 201. The starting hydraulic cylinders include an upper starting hydraulic cylinder 202a-2 and a lower starting hydraulic cylinder 202a-3. The tilting bracket 203 is connected to the first fixing plate 201 via a rotating shaft 201a-1. The upper starting hydraulic cylinder 202a-2 is connected to the upper triangular plate of the tilting bracket 203. The lower starting hydraulic cylinder 202a-3 is connected to the first fixing plate 201 via a fixed collar 202a-1.

[0039] Rotation device 3 includes a rotation inner support 302, a bearing inner ring 303, a bearing outer ring 304, and a second fixing plate 209. The bearing inner ring 303 is connected to the rotation inner support 302 and the bearing outer ring 304 respectively. One side of the second fixing plate 209 is connected to the flipping bracket 203 by fixing bolts 204, and the other side is connected to the bearing outer ring 304 by fastening bolts 207. The rotation inner support 302 is used to fix the blade root part.

[0040] The support device 4 includes a blade support 401, a lower wing plate 404, a leading edge 405 of an upper wing plate, and a trailing edge 403 of an upper wing plate. The upper left and right sides of the blade support 401 are respectively connected to clamping hydraulic cylinders 402. The top of the leading edge 405 and the trailing edge 403 of the upper wing plate are respectively connected to the other end of the clamping hydraulic cylinders 402. The lower wing plate 404 is fixed to the bottom of the support. The leading edge 405 and the trailing edge 403 of the upper wing plate are hinged to the lower wing plate 404 by pins. Preferably, the clamps of the leading edge 405 and the trailing edge 403 of the upper wing plate in the support device 4 are controlled to open and close by clamping hydraulic cylinders 402. The wing plate clamp can achieve close contact and reliable clamping of the blade without manual intervention, and can control the clamping force more flexibly to fix the blade. The blade support 401 is connected to the wing plate clamp, and the wing plate clamp preferably adopts a structure that fits the shape of the blade.

[0041] The trailer cab and the chassis of the fixing device 2 are connected by internal and external gear meshing. The fixing device 2 can rotate relative to the trailer cab. The cab can deflect 90°-135° relative to the vehicle body, thereby controlling the direction of travel of the transport vehicle.

[0042] Combination Figure 2 and Figure 4As shown, a flipping support platform 201a-2 is set in the middle of the first fixed plate 201, and the flipping bracket 203 is fixed to the flipping support platform 201a-2 through the rotating shaft 201a-1. The upper starting hydraulic cylinder 202a-2 is connected to the lower end opening of the first fixed plate 201 through a pin. The starting hydraulic cylinder has a maximum stroke of 1300mm. The upper and lower ends of the hydraulic cylinders on the left and right sides are connected in the same way as before. The second fixed plate 209 is connected to the inside of the flipping bracket 203 through an opening using fixing bolts 204, and the other side is connected to the rotating device 3. The limiting boss 208 is set between the flipping support platform 201a-2 and the flipping bracket 203, with one on each side, for fixing the flipping bracket 203 in the vertical position.

[0043] Combination Figures 2-5 As shown, in this embodiment, the rotating device also includes a motor 205a-1, a connecting gear 205a-3, a transmission gear 205a-4, and a reduction gear 206. The motor 205a-1 is located at the top of the flipping bracket 203. The connecting gear 205a-3, the transmission gear 205a-4, and the reduction gear 206 are fixed from top to bottom to one side of the flipping bracket 203 near the second fixed plate 209 and mesh with each other. The output shaft of the motor 205a-1 is connected to the connecting gear 205a-3 by a key. One end of the rotating inner support 302 is provided with a gear, and the reduction gear 206 meshes with the rotating inner support 302. The upper end of the flipping bracket 203 is provided with a motor support base, which has 4 bolt holes. The motor 205a-1 is fixed to the support base by bolts. The rotating shaft of the motor 205a-1 is connected to the connecting gear 205a-3 by a key to make them coaxial. The motor 205a-1 is preferably a 240V, 1.5MW DC motor. The first fixing plate 201 is provided with a power supply box 210. One end of the line is connected to the power supply box 210, and the other end is connected to the motor 205a-1 through a switch. The inner ring of the bearing 303 is connected to the outer ring of the bearing 304 and the rotating inner support 302 respectively. The outer ring of the bearing 304 and the second fixing plate 209 are provided with bolt holes around their perimeter. The two are connected by fastening bolts 207 for adjusting the rotation angle of the blades. The rotating device 3 is cylindrical and cooperates with the opening in the middle of the second fixing plate 209. The upper structure of the rotating device 3 can be welded to the perimeter or cast.

[0044] In practical implementation: such as Figure 2As shown, the blade root is fixed to the rotating inner support 302. The hydraulic cylinders 202a-2 and 202a-3 are filled with oil and extended outwards, causing the tilting bracket 203 to be vertically fixed. The blade is placed horizontally on the transport device, and the blade is transported normally. When an obstacle is encountered, the hydraulic cylinders 202a-2 and 202a-3 of the fixing device 2 discharge oil and are compressed. The tilting bracket 203 and the blade as a whole tilt towards the front of the vehicle. Depending on the road conditions, the tilt angle can be controlled within the range of 0°-45°. At this time, the hydraulic cylinders stop discharging oil, and the blade remains stationary. Based on the obstacle and wind load direction, the switch is pressed to control the motor 205a-1 to rotate. Power is transmitted through the meshing of the reduction gear 206, transmission gear 205a-4, and connecting gear 205a-3 to the rotating inner support 302. The blade follows the rotating inner support 302 and begins to rotate until it reaches the optimal angle. The control switch stops rotating, and the transport vehicle begins to move, passing through the obstacle.

[0045] refer to Figures 6-8 The upper wing leading edge 405, the upper wing trailing edge 403, and the lower wing 404 are respectively provided with shock-absorbing buffer membranes 406a-1. The shock-absorbing buffer membranes 406a-1 in the panels can effectively absorb high-frequency vibrations during transportation and reduce the impact force on the blade surface.

[0046] refer to Figures 6-8 The support device 4 also includes an angle iron support 406a-2, a movable plate 407, and a base plate 412. The movable plate 407 is elastically connected to the angle iron support 406a-2 via a sliding rod 406a-4 and a return spring 406a-3. The movable plate 407 is also elastically connected to the base plate 412. Compression springs 408 and support springs 409 are installed on the bottom and side walls of the base plate 412, respectively. The movable plate 407 and the base plate 412 are elastically connected via compression springs 408 and support springs 409. The movable plate 407 is elastically connected to the angle iron support 406a-2 via a sliding rod 406a-4 and a return spring 406a-3. At the same time, the movable plate 407 is also elastically connected to the base plate 412. This multi-layered elastic connection structure can buffer vibrations of different directions and magnitudes. When encountering significant bumps, the elastic connection between the return spring 412 and the movable plate 407 and the base plate 412 can absorb the impact force, preventing the blades from being damaged by direct impact. The compression springs 408 and support springs 409 installed on the bottom and side walls of the base plate 412 further enhance the shock absorption capacity. They can provide corresponding elastic force to counteract the vibration when the device is subjected to vibrations in various directions such as up and down, left and right, so that the blades can be transported in a relatively stable environment.

[0047] A slider 410 is located at the center of the base plate 412, and a fixed block is located at the center of the movable plate 407. A shock-absorbing swing rod 411 connects the fixed block at the center of the movable plate 407 and the slider 410 at the center of the base plate. This unique connection method allows for more flexible and regular relative movement between the movable plate 407 and the base plate 412 when subjected to vibration. The shock-absorbing swing rod 411 can, to a certain extent, change the transmission path and direction of vibration, converting some longitudinal vibration into the swing of the swing rod, thereby reducing the longitudinal impact on the blades. At the same time, the swing of the swing rod can also cooperate with other shock-absorbing components to form a dynamic shock-absorbing system, more effectively attenuating vibration energy.

[0048] refer to Figures 6-8 In specific implementation: When the blade is transported under normal road conditions, the blade root is set in the rotating inner support 302. The hydraulic cylinder is activated and filled with oil, causing the tilting bracket 203 to be vertically fixed. The blade body is fixed to the support device 4. The clamping hydraulic cylinder 402 is filled with oil. The blade body is fixed to the blade support 401 by the leading edge 405 of the upper wing plate, the trailing edge 403 of the upper wing plate, and the lower wing plate 404. The shock-absorbing buffer membrane 406a-1 is tightly attached to the blade surface. During blade transport, the blade support 203 and the angle iron support 406a-2 are subjected to swing loads from the left and right sides. This load is then transferred to the movable plate 407, compressing the return spring 406a-3. The spring swings left and right along with the blade support 401 at the upper end of the slide rod 406a-4, absorbing the vibration loads from the left and right sides. The shock-absorbing swing rod 41... 1. The slider 410 slides, and in conjunction with the compression spring 408 and the support spring 409, it swings up and down to absorb the vibration load on the upper and lower sides. When the blade encounters an obstacle, the clamping hydraulic cylinder 402 of the support device 4 releases oil, the leading edge 405 and the trailing edge 403 of the upper wing plate open, and the starting hydraulic cylinders 202a-2 and 3 of the fixing device 2 release oil. The tilting bracket 203 and the blade tilt towards the front of the vehicle, and the tilting angle is controlled within the range of 0°-45°. Then, the rotating inner support 302 meshes with the reduction gear 206, the transmission gear 205a-4, and the connecting gear 205a-3. The motor 205a-1 provides power. When the blade angle is adjusted to the optimal position, the control switch cuts off the power, the motor 205a-1 stops running, and then the transport vehicle starts and passes through the obstacle smoothly.

[0049] refer to Figure 1The vehicle body includes a front slide rail, a rear slide rail, and a sliding plate. The front and rear slide rails are slidably connected, and the sliding plate is slidably positioned above the front and rear slide rails. A support device 4 is fixed above the sliding plate. The slidable connection between the front and rear slide rails allows the vehicle body length to be flexibly adjusted according to the length of the wind turbine blades. When transporting longer blades, the rear slide rail can be pulled outward relative to the front slide rail to extend the vehicle body length and provide sufficient support space for the blades. For shorter blades, the rear slide rail can be retracted inward to save space. This adjustable vehicle body length design greatly improves the versatility of the transport device and can meet the transport needs of various specifications of wind turbine blades.

[0050] In summary, this invention provides a fixing device 2 and a rotating device 3 at the front end of the trailer body 1. Combined with the tilting bracket 203 at the front of the vehicle body, the trailer head and the fixing device 2 are controlled collaboratively through the meshing of internal and external gears. This structure allows for adjustment of the blade's attitude angle during wind turbine blade installation. Furthermore, when encountering complex road conditions during transport, the angle can be adjusted by driving the upper starting hydraulic cylinder 202a-2 and the lower starting hydraulic cylinder 202a-3 to adapt to changes in road conditions. Additionally, the combined design of the rotating inner support 302 and the bearing outer ring 304 in the rotating device 3, along with the supporting device, ensures that the blade is firmly fixed at its root, effectively preventing lateral or longitudinal displacement of the blade during transport. This provides all-around support for the blade, evenly distributing the fixing force on the blade and avoiding damage caused by localized stress concentration.

[0051] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A wind turbine blade transportation device adapted to complex road conditions, comprising a trailer body (1) comprising a trailer nose and a trailer body, and a support device (4) for supporting a blade tail position, characterized in that, Also include: The fixed device (2) is fixed to the front end of the vehicle body, the fixed device (2) includes two starting hydraulic cylinders, first fixed plate (201) and turnover support (203), the vehicle head and the bottom of first fixed plate (201) are engaged through internal and external gear, one end of two starting hydraulic cylinders is connected with the upper end of turnover support (203), the other end of two starting hydraulic cylinders is connected with first fixed plate (201); The rotating device (3) includes rotating inner support (302), bearing outer ring (304) and second fixed plate (209), one side of second fixed plate (209) is connected with turnover support (203), the other side is connected with bearing outer ring (304), rotating inner support (302) is used for fixing blade root part, the rotating device further includes motor (205a-1), connecting gear (205a-3), transmission gear (205a-4) and reduction gear (206), motor (205a-1) is arranged at the top end of turnover support (203), connecting gear (205a-3), transmission gear (205a-4) and reduction gear (206) are sequentially fixed on the side of turnover support (203) close to second fixed plate (209) from top to bottom and are engaged with each other, the output shaft of motor (205a-1) is connected with connecting gear (205a-3) through pin key, one end of rotating inner support (302) is provided with gear, reduction gear (206) is engaged with rotating inner support (302); The support device (4) includes blade support (401), lower wing plate (404), upper wing plate front edge (405) and upper wing plate rear edge (403), the upper end of blade support (401) is connected with clamping hydraulic cylinder (402) on the left and right sides respectively, the top of upper wing plate front edge (405) and upper wing plate rear edge (403) is connected with the other end of clamping hydraulic cylinder (402) respectively, lower wing plate (404) is fixed at the bottom end of the support, the two sides of upper wing plate front edge (405) and upper wing plate rear edge (403) are hinged with lower wing plate (404) through pin shaft.

2. A wind turbine blade transportation device suitable for complex road conditions according to claim 1, characterized in that, The middle part of first fixed plate (201) is provided with turnover support table (201a-2), turnover support (203) is connected with turnover support table (201a-2) through rotating shaft (201a-1).

3. A wind turbine blade transportation device suitable for complex road conditions as claimed in claim 1, wherein, The first fixed plate (201) and turnover support (203) are provided with limiting boss (208).

4. A wind turbine blade transportation device suitable for complex road conditions as claimed in claim 1, wherein, The shock-absorbing buffer film (406a-1) is arranged in the panel of upper wing plate front edge (405), upper wing plate rear edge (403) and lower wing plate (404) respectively.

5. A wind turbine blade transportation device suitable for complex road conditions as claimed in claim 1, wherein, The support device (4) further includes angle iron support seat (406a-2), movable plate (407) and bottom plate (412), movable plate (407) is elastically connected with angle iron support seat (406a-2) through slide rod (406a-4) and reset spring (406a-3), movable plate (407) is elastically connected with bottom plate (412).

6. A wind turbine blade transportation device suitable for complex road conditions according to claim 5, characterized in that, The bottom of the bottom plate (412) and the side wall are respectively provided with compression springs (408) and supporting springs (409), and the movable plate (407) and the bottom plate (412) are elastically connected through the compression springs (408) and the supporting springs (409).

7. A wind turbine blade transportation device suitable for complex road conditions as claimed in claim 5, wherein, The center of the bottom plate (412) is provided with a sliding block (410), and the center of the movable plate (407) is provided with a fixed block, and the fixed block and the sliding block (410) are connected with a damping swing rod (411).

8. A wind turbine blade transportation device suitable for complex road conditions as claimed in claim 1, wherein, The The body comprises a front sliding rail, a rear sliding rail and a sliding plate, the front sliding rail and the rear sliding rail are slidingly sleeved, the sliding plate is slidingly arranged above the front sliding rail and the rear sliding rail, and the supporting device (4) is fixed above the sliding plate.

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