Locking and limiting device and drawing beam

Abstract

The utility model belongs to the technical field of wind power blade transport vehicles, and particularly relates to a locking and limiting device and a drawing beam, the locking and limiting device comprises a limiting pin and a fixing pipe, the pipe wall of the fixing pipe is provided with a vertically-through through hole, and the outer wall of the limiting pin is provided with a vertically-through kidney-shaped hole corresponding to the through hole. A bolt penetrates through the kidney-shaped hole and the through hole at the same time, and the two ends of the bolt are locked to the fixing pipe through a nut and a nut respectively and axially move in the kidney-shaped hole at the same time. U-shaped pulling plates are hinged to the two sides, close to the kidney-shaped hole, of the limiting pin through pin shafts, the U-shaped pulling plates are pulled through rotation, and a bolt axially moving in the kidney-shaped hole is axially connected with the fixing pipe in a sliding mode. The locking device can be more suitable for the working condition that gaps between drawing beams are extremely small in the wind power blade transportation process, and the problem that an existing locking device is difficult to apply due to the complex structure and installation and the difference of principles is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of wind turbine blade transport vehicles, specifically relating to a locking and limiting device and a pull-out beam. Background Technology

[0002] During the transportation of wind turbine blades, the length of the extended main beam often reaches 40 meters or even longer due to transportation requirements. In such long-distance extended structures, a reliable locking and limiting mechanism is needed between the beams. This locking and limiting mechanism needs to have a dual function: firstly, to prevent the beam from being completely extended, ensuring safety during transportation; and secondly, to connect the front and rear beams to withstand the tensile forces generated during vehicle movement, ensuring the stability of the overall structure. However, in practical applications, the gaps between the extended beams are small, posing significant challenges to the installation of the locking and limiting mechanism. Currently, automatic locking devices typically require power source control lines, such as cables, air pipes, or hydraulic lines. However, these lines cannot be installed in such narrow gaps. Even if they could be installed, the extremely long beams would require corresponding lengths of piping and auxiliary installation accessories, greatly increasing the product cost. Therefore, current automatic locking devices are difficult to apply to locking and limiting long-distance extended beams.

[0003] Existing technologies include research on the installation problems of current automatic locking devices, such as patent application CN220974026U - a longitudinal cargo support structure for a truck-mounted crane, which uses a limiting locking device composed of components such as a locking tongue, a compression spring, a rotating sleeve, a handle, and a cover plate. One end of the locking tongue extends elastically from the end of the rotating sleeve under the action of the compression spring's return force. The locking tongue is axially elastically extended and retracted by the handle to lock the inner beam of the sliding support. However, this device is mainly for the longitudinal support of the cargo box of a truck-mounted crane, and its structure and working principle are different from the locking and limiting requirements of long-distance pull-out beams in wind turbine blade transportation, so it cannot be directly applied to the wind turbine blade transportation scenario.

[0004] For example, patent application CN219152622U, "A Longitudinal Beam Locking Positioning Device and Blade Transport Vehicle," uses a shaped positioning plate suspended inside an open housing. A torsion spring is used to quickly reset the positioning plate, thus locking the longitudinal beam in place. However, this device has a relatively complex structure and is difficult to install. Furthermore, its positioning pin has a pen-like structure with a small contact area and insufficient rigidity, making it unsuitable for the retraction action of long-distance pulling beams used in transporting heavy and bulky wind turbine blades.

[0005] In summary, existing locking and limiting mechanisms are difficult to apply to the locking and limiting of long-distance pull beams in wind turbine blade transport vehicles due to differences in structure, installation difficulty, and operating principles. Therefore, a new technical solution is needed to address these technical problems. Utility Model Content

[0006] The purpose of this utility model is to provide a locking and limiting device and a pull-out beam to solve the problems mentioned in the background art, such as the difficulty of applying the current locking and limiting mechanism to the long-distance pull-out beam of the wind turbine blade transport vehicle due to differences in structure, installation difficulty and principle.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a locking and limiting device, comprising a limiting pin and a fixed tube coaxially sleeved with and sliding relative to the limiting pin. The fixed tube has a through hole extending vertically, and the outer wall of the limiting pin has an oblong hole extending vertically corresponding to the through hole. Bolts pass through both the oblong hole and the through hole. The two ends of the bolts are respectively locked to the fixed tube with nuts and bolts and move axially within the oblong hole. U-shaped pull plates are hinged to the limiting pin near the oblong hole via pin shafts. The bolts, which move axially within the oblong hole by rotating and pulling the U-shaped pull plates, are axially slidably connected to the fixed tube. The U-shaped pull plates are semi-enclosed and clamped to the outer wall of the limiting pin and simultaneously limited and clamped in the U-shaped grooves opened axially on both sides of the fixed tube near the through hole via pin shafts.

[0008] Furthermore, the bolt is screwed into the through hole thread and its two ends are locked and fixed to the top and bottom of the fixed tube wall by nuts and bolts respectively. The limiting pin is axially slidable relative to the fixed tube by clearance fit with the bolt through the waist-shaped hole.

[0009] Furthermore, the limiting pin has an axial blind hole communicating with the waist-shaped hole. A spring is disposed in the blind hole and an end cap is closed at its opening end. The end cap elastically abuts against the bolt shank by the elastic force of the spring. One end of the spring abuts against the bottom of the blind hole and the other end abuts against the end cap that closes the opening end of the blind hole. The end cap applies a preload to the bolt by the elastic force of the spring.

[0010] Furthermore, the bottom of the opening of the U-shaped pull plate is set as an arc-shaped structure, and its two ends are respectively fixedly connected to two pins and hinged to the outer wall of the limiting pin in a suspended manner through the pins; one end of the pin is embedded in the U-shaped pull plate and its other end extends to the inner side of the U-shaped pull plate and is rotatably connected to the outer wall of the limiting pin, and the middle part of the pin is locked in the U-shaped groove; a handle is fixed to the top of the U-shaped pull plate, and the plate is rotated and pulled relative to the limiting pin by pulling the handle with the pin as the rotation center.

[0011] In addition to the above technical solutions, there is also a pull-out beam with the locking and limiting device, wherein the fixing tube is fixed in the mounting hole of the outer beam upright plate of the pull-out beam, and the limiting pin is extended and retracted in the locking hole of the inner beam upright plate of the pull-out beam by rotating and pulling the U-shaped pull plate, the bolt moving axially in the waist-shaped hole, and the spring in the axial blind hole of the limiting pin.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model ingeniously utilizes the principle of mechanical transmission to achieve efficient and reliable locking and limiting functions within a confined space. By using a bolt passing through the oblong hole of the fixing pipe and the limiting pin, combined with the hinged design of the U-shaped pull plate and the limiting pin, a mechanical linkage structure is constructed. This eliminates the reliance of traditional automatic locking devices on power source control pipelines (such as cables, air pipes, and hydraulic lines), avoiding the problems of high costs, difficult installation, and complex maintenance caused by long-distance pipeline laying. By rotating the U-shaped pull plate, the axial movement of the bolt within the oblong hole achieves the extension and retraction of the limiting pin, thereby completing the locking and unlocking actions and improving operational efficiency. The ease and efficiency of operation make this locking and limiting device more suitable for the extremely small gap between the pull beams during the transportation of wind turbine blades. It solves the problem that existing locking devices are difficult to apply due to their complex structure, installation and different principles. Furthermore, through the sleeve sliding structure of the fixed tube and the limiting pin, combined with the semi-enclosed snap-fit ​​design of the U-shaped pull plate, the limited space is fully utilized. On this basis, the U-shaped pull plate is fixed in the U-shaped groove of the fixed tube by the pin shaft, which not only ensures the stability of the locking state, but also avoids interference with the pull beam. This allows the locking and limiting device to withstand greater tension during vehicle operation, ensuring transportation safety.

[0014] 2. This utility model adopts a threaded connection and a nut and bolt locking method, which not only makes the installation and disassembly of bolts more convenient and quick, effectively reduces the difficulty of maintenance and repair, and improves work efficiency, but also makes the bolts less likely to loosen or fall off when subjected to large external forces, greatly enhancing the connection stability between the bolt and the fixed pipe. The sliding connection of the limit pin is achieved through the gap fit between the oblong hole and the bolt, so that the limit pin can be adjusted in axial position in the fixed pipe according to the actual working conditions by using the axial movement of the oblong hole and the bolt. This effectively increases the flexibility and adaptability of the locking and limiting device, and also facilitates the miniaturization and lightweight design of the locking and limiting device, making it easy to install and use in limited spaces.

[0015] 3. This utility model utilizes the elasticity of the spring to ensure that the end cap remains in close contact with the bolt shank, increasing the friction between the limiting pin and the bolt and preventing the limiting pin from easily sliding under external force. This improves the reliability of the connection between the limiting pin and the bolt, ensures the stability of the limiting pin after axial position adjustment, and also utilizes the elastic deformation capacity of the spring to buffer and dampen the limiting pin, effectively reducing the mutual collision and wear between the limiting pin and the bolt and between various components of the entire device, extending the service life of the device, and improving the operational stability of the device.

[0016] 4. This utility model allows for the quick unlocking and resetting of the limit pin by pulling the U-shaped pull plate with a handle. Based on this, the arc surface design of the U-shaped pull plate ensures the stability of the rotation center, allowing the limit pin to move horizontally. This avoids the offset or jamming problems caused by rotation in traditional devices. The extension and retraction of the limit pin is achieved by pulling and rotating the U-shaped pull plate, which not only simplifies the operation process but also improves work efficiency. It is especially suitable for frequent loading and unloading operations in the transportation of wind turbine blades. Attached Figure Description

[0017] Figure 1 This is a side view of the locking and limiting device of this utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the exploded assembly structure;

[0019] Figure 3 for Figure 1 A top-view cross-sectional structural diagram;

[0020] Figure 4 This is a schematic cross-sectional view of the locking and limiting device of this utility model in the locked state.

[0021] Figure 5 This is a cross-sectional structural diagram of the locking and limiting device of this utility model during the unlocking process.

[0022] Figure 6 This is a cross-sectional structural diagram of the locking and limiting device of this utility model in the unlocked state.

[0023] The components include: 1. Limit pin; 101. Waist-shaped hole; 102. Blind hole; 2. Fixing tube; 201. Through hole; 202. U-shaped groove; 3. Bolt; 301. Nut; 302. Nut; 303. Washer; 4. Spring; 5. End cap; 6. Pin; 7. U-shaped pull plate; 8. Handle; 9. Outer beam upright plate; 10. Inner beam upright plate. Detailed Implementation

[0024] The following embodiments are used to further illustrate the content of this utility model, and do not limit the application of this utility model. Example 1:

[0025] Please see Figures 1-6This utility model provides a locking and limiting device, including a limiting pin 1 for locking and a fixed tube 2 coaxially sleeved with the limiting pin 1 and sliding relative to it. The fixed tube 2 has a through hole 201 that runs vertically through it and is used for bolts 3 to pass through. The outer wall of the limiting pin 1 has a waist-shaped hole 101 that runs vertically through it and is used for the axial movement of bolts 3, corresponding to the position of the through hole 201. Bolts 3 for assisting U-shaped pull plates to force the limiting pin 1 to extend and retract are passed through the waist-shaped hole 101 and the through hole 201. Bolts 3 are threadedly connected to the through hole 201, and their two ends are locked and fixed to the top and bottom ends of the fixed tube 2 through their nuts 301 and nut 302 and washers 303, respectively. The bolt 3 rod locked on the fixed tube 2 can move axially in the waist-shaped hole 101, while the limiting pin 1 is axially slidably connected to the fixed tube 2 through the gap fit between the waist-shaped hole 101 and the bolt 3.

[0026] The limiting pin 1 has a blind hole 102 that communicates with the waist-shaped hole 101 and is axially arranged inside. A spring 4 for applying a preload to the bolt 3 is arranged inside the blind hole 102. One end of the spring 4 abuts against the bottom of the blind hole 102 and the other end extends axially to abut against the end cap 5 that closes the opening of the blind hole 102. The end cap 5 elastically abuts against the bolt 3 through the elastic force of the spring 4 and applies a preload to the bolt 3.

[0027] The limiting pin 1 is hinged to the two sides of the waist-shaped hole 101 by the pin shaft 6. The U-shaped pull plate 7 is used to rotate and pull the limiting pin 1 to slide axially relative to the fixed tube 2. The bottom of the opening of the U-shaped pull plate 7 is set as an arc-shaped structure and its two ends are fixedly connected to the two pin shafts 6 respectively. It is semi-enclosed and hinged to the outer wall of the limiting pin 1 in a suspended manner by the pin shaft 6. At the same time, it is limited and locked in the U-shaped groove 202 opened axially on both sides of the fixed tube 2 near the through hole 201 by the pin shaft 6.

[0028] One end of the pin 6 is embedded in the U-shaped pull plate 7 and the other end extends into the U-shaped pull plate 7 and is rotatably connected to the outer wall of the limiting pin 1. The middle part of the pin 6 is locked in the U-shaped groove 202, so that the limiting pin 1 is locked in the fixed tube 2 under the limiting of the pin 6 on the U-shaped pull plate 7, which plays a positioning role.

[0029] The top of the U-shaped pull plate 7 is fixed with a manual handle 8. By pulling the handle 8, the limit pin 1 is rotated and pulled relative to the limit pin 1 with the pin as the rotation center. The limit pin 1 moves with the rotation of the U-shaped pull plate 7 when the handle is pulled manually. Then, with the help of the bolt 3 that moves axially in the waist-shaped hole 101, the limit pin 1 can slide axially relative to the fixed tube 2, realizing the telescopic function. This allows the locking and unlocking operations of the inner beam and outer beam of the pull-out beam to be completed.

[0030] The working principle and usage process of this embodiment are as follows: Figures 1-6The diagram illustrates that after the locking and limiting device is assembled, the operator installs the entire device onto the pull-out beam of the wind turbine blade transport vehicle (the functions and structures of pull-out beams and other conventional equipment are well-known in the field, and the connection settings are also common knowledge, so they will not be explained in detail here, nor are they shown in the attached drawings, although the inner and outer beam uprights of the pull-out beam are shown in the drawings). Specifically, the end of the fixing pipe 2 without the through hole 201 is fixed into the mounting hole of the outer beam upright 9 of the pull-out beam, while the end of the limiting pin 1 without the oblong hole 101 (i.e., the unopened end of the limiting pin 1) faces the locking hole of the inner beam upright 10 and has an oblong shape. The end of hole 101 faces the outside of the outer beam upright plate 9 of the pull beam. Then, the handle 8 is manually controlled so that the limiting pin 1, which slides axially in the fixed tube 2, can be locked or unlocked in the locking hole of the inner beam upright plate 10 of the pull beam. The purpose is to make the locking and limiting device more suitable for the working conditions where the gap between the pull beams is extremely small during the transportation of wind turbine blades. It solves the problem that the existing locking device is difficult to apply due to its complex structure, installation and different principles. At the same time, it eliminates the dependence of the traditional automatic locking device on the power source control pipeline, and avoids the problems of high cost, difficult installation and complicated maintenance caused by long-distance pipeline laying.

[0031] When the outer and inner beams of the pull-out beam need to be locked, the operator first fixes the coaxially sleeved and relatively sliding limit pin 1 fixing tube 2 to the outer beam upright plate 9, and then manually operates the handle 8 to make the U-shaped pull plate 7 in a vertical position relative to the limit pin 1 (e.g. Figure 4 As shown), when the U-shaped pull plate 7 is in a vertical state, the limiting pin 1 slides axially toward the locking hole of the inner beam upright plate 10 relative to the fixed tube 1 until it is fully inserted into the locking hole of the inner beam upright plate 10. At this time, the spring 4 will be reset under the sliding of the limiting pin 1, so that the bolt 3 will be in the outer end position inside the waist-shaped hole 101 under the reset of the spring 4, thereby realizing the locking of the outer beam and the inner beam.

[0032] When the outer and inner beams of the pull-out beam need to be unlocked, the operator manually pulls the handle 8 towards the outer side of the outer beam upright plate 9 (that is, pulls the handle 8 downwards). At this time, the U-shaped pull plate 7 will rotate around the pin 6 as the center of rotation (the center of rotation of the U-shaped pull plate 7 always stays on the center line of the limit pin 1), causing the limit pin 1 to slide horizontally towards the outer side of the outer beam upright plate 9 relative to the fixed tube 2 (e.g., Figure 5 As shown), at this time, the spring 4 will be compressed by the sliding of the limit pin 1, forcing the bolt 3 to move towards the inner end position of the oblong hole 101 under the compression of the spring 4. Then, continue to turn the handle 8 in this direction until the U-shaped pull plate 7 is in a horizontal position relative to the limit pin 1 (as shown). Figure 6As shown), the end plane of the U-shaped pull plate 7 contacts the outer beam upright plate 9. When the U-shaped pull plate 7 is in a horizontal state, the limiting pin 1 will completely disengage from the locking hole of the inner beam upright plate 10 and its inner end face will be flush with the inner side of the outer beam upright plate 9. The bolt 3 will also be in the inner end position of the waist-shaped hole 101 under the compression of the spring 4, thereby unlocking the outer beam and the inner beam.

[0033] When the outer and inner beams of the pull-out beam are locked again, the operator only needs to lift the handle 8 upwards, and the limit pin 1 will automatically reset under the force of the spring 4, thus achieving limit locking. Example 2:

[0034] Please see Figures 1-6 As another objective of this utility model, a pull-out beam is provided, in which the above-mentioned locking and limiting device is provided. The fixing tube 2 is fixed in the mounting hole of the outer beam upright plate 9 of the pull-out beam. The limiting pin 1 is extended and retracted in the locking hole of the inner beam upright plate 10 of the pull-out beam by rotating and pulling the U-shaped pull plate 7, the bolt 3 which moves axially in the waist-shaped hole 101, and the spring 4 in the axial blind hole 102 of the limiting pin 1. Therefore, the pull-out beam can obtain any of the beneficial effects of the locking and limiting device described above, which will not be repeated here.

Claims

1. A locking stop device comprising a stop pin and a fixed tube coaxially sleeved with the stop pin and relatively sliding, characterized in that, The pipe wall of the fixed pipe is provided with a through hole penetrating from top to bottom, a waist-shaped hole penetrating from top to bottom is provided on the outer wall of the limiting pin corresponding to the position of the through hole, a bolt penetrates through the waist-shaped hole and the through hole, the two ends of the bolt are locked on the fixed pipe by a nut and a screw cap and simultaneously axially move in the waist-shaped hole, the limiting pin is hingedly connected with a U-shaped pull plate by a pin shaft near both sides of the waist-shaped hole, and the U-shaped pull plate is axially slidingly connected with the fixed pipe by rotating and pulling the U-shaped pull plate and the bolt axially moving in the waist-shaped hole, the U-shaped pull plate is semi-enclosed and clamped on the outer wall of the limiting pin and is clamped in a U-shaped groove axially provided on both sides of the fixed pipe near the through hole by the pin shaft.

2. The locking stop device according to claim 1, wherein The bolt is threadedly connected with the through hole, and the two ends of the bolt are locked and fixedly connected with the top end and the bottom end of the pipe wall of the fixed pipe by a nut and a screw cap.

3. A locking stop device according to claim 2, wherein The limiting pin is axially slidingly connected with the fixed pipe through the gap between the waist-shaped hole and the bolt.

4. The locking stop device of claim 3, wherein An axial blind hole is arranged in the limiting pin and communicates with the waist-shaped hole, a spring is arranged in the blind hole, and an end cover is arranged at the opening end of the blind hole, and the end cover elastically abuts against the rod of the bolt by the elastic force of the spring.

5. A locking stop device according to claim 4, wherein One end of the spring abuts against the bottom of the blind hole, and the other end of the spring abuts against the end cover closing the opening end of the blind hole.

6. A locking stop device according to claim 5, wherein The end cover applies a pre-tightening force to the bolt by the elastic force of the spring.

7. The locking stop device of claim 1, wherein The open bottom end of the U-shaped pull plate is provided in a circular arc structure, the two open ends are fixedly connected with two pin shafts and are hingedly connected with the outer wall of the limiting pin in a suspended manner by the pin shafts.

8. A locking stop device according to claim 7, wherein One end of the pin shaft is embedded in the U-shaped pull plate, and the other end of the pin shaft extends to the inner side of the U-shaped pull plate and is rotatably connected with the outer wall of the limiting pin, and the middle part of the pin shaft is clamped in the U-shaped groove.

9. A locking stop device according to claim 8, wherein A handle is fixed to the top of the U-shaped pull plate, and the U-shaped pull plate is rotatably arranged relative to the limiting pin by pulling the handle with the pin shaft as the rotation center.

10. A pull beam, characterized by The locking and limiting device comprises a fixed pipe, a limiting pin, a bolt, a U-shaped pull plate, a pin shaft and a spring, and the fixed pipe is fixed in the mounting hole of the outer beam upright plate of the pull beam.

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