A locking mechanism, a telescopic device and its usage method

Abstract

This invention relates to the field of locking technology for telescopic lifting equipment, specifically a locking mechanism, telescopic device, and method of use, solving the problem of low reliability of locking mechanisms during long-term operation in existing technologies. A locking mechanism includes an actuator that provides support and locking for a telescopic inner sleeve. The actuator is movably mounted on a telescopic outer sleeve, and a drive mechanism that moves the actuator is located on the outer sleeve. The beneficial effects of this invention are: the weight and working load of the telescopic inner sleeve act entirely on the actuator and are transmitted to the telescopic outer sleeve through it; the actuator provides stable support for the telescopic inner sleeve for extended periods, while the drive mechanism does no work in supporting the inner sleeve, reducing energy loss and ensuring the reliability of the locking mechanism during long-term use.

Description

Technical Field

[0001] This invention relates to the field of locking technology for telescopic lifting devices, and in particular to a locking mechanism, telescopic device, and method of use. Background Technology

[0002] Common lifting equipment mainly consists of two types: articulated boom lifts and telescopic boom lifts. Telescopic boom lifts are primarily used in various electric lifting masts, lifting platforms, cranes, and other industries, relying on multiple telescopic sections for vertical extension and retraction. To maintain the extended state of the boom, a locking mechanism is generally required to lock it in place. Common locking mechanisms include brake clutches, pins, and rack and pinion structures. However, these mechanisms generally suffer from complex structures, low integration, and high drive power, making them unsuitable for applications requiring high elevation and high lifting speed, such as signal towers and cranes.

[0003] A prior art patent with publication number CN109457680A discloses a locking mechanism suitable for a self-elevating platform, comprising: a locking tooth block, a horizontal telescopic assembly, a pin assembly, a lifting assembly, and a locking support. One end of the horizontal telescopic assembly is hinged to the fixed pile frame of the self-elevating platform, and the other end of the horizontal telescopic assembly is hinged to the locking tooth block; the locking tooth block is used to engage with the rack of the pile leg of the self-elevating platform. The lifting assembly is located above the locking tooth block and is hinged to the fixed pile frame; the lifting assembly is used to drive the locking tooth block to move along the length direction of the pile leg rack. The locking support is fixed to the fixed pile frame, and the bottom of the locking support is used to abut against the top of the locking tooth block.

[0004] Its locking mechanism uses a gear rack and a lifting assembly to achieve the locking and anti-reverse functions of the equipment. This structure has the characteristics of high installation accuracy requirements, high manufacturing cost, low transmission speed, low reliability, large space occupation, high power load requirements, and cannot work in harsh outdoor environments. Furthermore, the locking mechanism cannot be used under conditions where high reliability is required for long-term operation. Summary of the Invention

[0005] This invention proposes a locking mechanism, a telescopic device, and a method of use, which solves the problems of low reliability and large space occupation of the locking mechanism in the prior art.

[0006] The technical solution of this invention is implemented as follows: A locking mechanism includes an actuator providing support and a drive mechanism for moving the actuator. The drive mechanism includes a telescopic rod and a ball-head fork. The end of the telescopic rod is movably connected to the ball-head fork, which is connected to the actuator. The telescopic rod's extension and retraction causes the ball-head fork to swing, which in turn moves the actuator, opening or resetting it, thereby unlocking or locking the telescopic inner sleeve. The drive mechanism is located on the outside of the telescopic outer sleeve, reducing space requirements, and ensuring the locking mechanism is fully supported by a mechanical structure, enabling it to operate in harsh outdoor environments.

[0007] The telescopic rod is an electric push rod, with the actuator movably mounted on the telescopic outer sleeve. The electric push rod is located on the outside of the telescopic outer sleeve, and the ball-head fork is hinged to the telescopic outer sleeve. The weight of the telescopic inner sleeve and the working load act entirely on the actuator and are transmitted to the telescopic outer sleeve through the actuator. The actuator provides stable support for the telescopic inner sleeve for extended periods, while the drive mechanism does no work in supporting the telescopic inner sleeve, reducing energy loss and ensuring the reliability of the locking mechanism for long-term use.

[0008] The tail of the electric actuator is hinged to the outer wall of the telescopic sleeve, and the head of the electric actuator is hinged to the ball joint fork. The tail of the electric actuator is connected to the telescopic sleeve via a pin, and the electric actuator can swing horizontally around the pin. The extension and retraction of the electric actuator can drive the ball joint fork to swing.

[0009] The electric push rod is equipped with an emergency handwheel on its drive motor and a stroke sensor on its push rod. In the event of an abnormal power outage, the electric push rod can be extended or retracted via the emergency handwheel, thereby locking and unlocking the telescopic inner sleeve; the stroke sensor can determine the extension length of the electric push rod, thus ensuring that the electric push rod extends or retracts to the correct position, and thus ensuring that the actuator moves to the correct position.

[0010] The ball-head shift fork includes a shift lever and a sleeve, which are slidably connected. One end of the sleeve is hinged to the head of the electric push rod, and the other end of the sleeve is hinged to the telescopic outer sleeve. The end of the shift lever is provided with a ball head, which is movably connected to the actuator. When the actuator opens, the sleeve and the shift lever swing, and the shift lever extends out of the sleeve, causing the actuator to open.

[0011] The actuator is a locking block, with an L-shaped groove on its upper part that engages with the telescopic inner sleeve inside the telescopic outer sleeve. The lower part of the locking block is rotatably connected to the telescopic outer sleeve via a connecting shaft. The transverse inner wall of the L-shaped groove contacts the end face of the telescopic inner sleeve, and the vertical inner wall of the L-shaped groove contacts the side of the telescopic inner sleeve. The locking block provides support for the telescopic inner sleeve through the L-shaped groove.

[0012] The connecting shaft is equipped with a torsion spring that engages with the locking block. In the event of a drive mechanism failure, after the telescopic inner sleeve extends, the locking block can be quickly reset by the torsion spring, improving the reliability of the locking mechanism.

[0013] The locking block has a vertically arranged elongated hole, and the ball head mates with the elongated hole. When the lever drives the locking block to swing, the ball head slides within the elongated hole.

[0014] The L-shaped slot has a pad on its inner side. The pad reduces impact and acts as a buffer, thus protecting the telescopic inner sleeve.

[0015] A telescopic device includes the aforementioned locking mechanism; a retaining groove is provided on the side wall of the telescopic inner sleeve. A locking block engages with the retaining groove at different positions, allowing the telescopic device to meet different telescopic length requirements.

[0016] The telescopic device is equipped with two locking mechanisms, which are symmetrically arranged on both sides of the telescopic device. This ensures that when the locking mechanism locks the telescopic device, the actuator provides stable support for the telescopic inner sleeve, thereby ensuring the structural stability of the telescopic device.

[0017] A method of using a telescopic device includes: The extension process of the telescopic inner sleeve: The drive mechanism drives the locking block to open, and the telescopic inner sleeve extends rapidly under the action of external force; after the telescopic inner sleeve extends to the end, the drive mechanism pushes the locking block to reset, and the locking block cooperates with the bottom surface or anti-reverse groove of the telescopic inner sleeve, locking the telescopic inner sleeve; the external force driving the telescopic inner sleeve to move is removed, so that the self-weight and working load of the telescopic inner sleeve are fully applied to the locking block, and transmitted to the telescopic outer sleeve through the locking block; the external force can be provided by a winch or hydraulic cylinder, etc. After the locking block locks the telescopic inner sleeve, the locking block provides support for the telescopic inner sleeve, and long-term stable support for the telescopic inner sleeve can be achieved without the drive mechanism doing work.

[0018] The telescopic inner sleeve retraction process: The telescopic inner sleeve is lifted under the action of external force. The telescopic inner sleeve is lifted a certain distance to provide space for the swing of the locking block, which facilitates the separation of the locking block from the telescopic inner sleeve; the drive mechanism drives the locking block to flip, the locking block opens, and the locking block flips to the outside of the telescopic outer sleeve, realizing the unlocking of the locking block from the telescopic inner sleeve; the telescopic inner sleeve is quickly lowered and reset under the action of external force, and the telescopic inner sleeve is retracted.

[0019] The beneficial effects of this invention are as follows: the weight of the telescopic inner sleeve and the working load act entirely on the actuator, and are then transmitted to the telescopic outer sleeve through the actuator; the actuator provides stable support for the telescopic inner sleeve over a long period of time, while the drive mechanism does no work in supporting the telescopic inner sleeve, reducing energy loss and ensuring the reliability of the locking mechanism for long-term use. The actuator and drive mechanism of the locking mechanism are entirely driven and supported by mechanical structures, enabling the locking mechanism to maintain stable support for extended periods even in harsh outdoor environments.

[0020] The drive mechanism is located on the outside of the telescopic outer sleeve, and the locking block is located on the side wall of the telescopic outer sleeve. This allows for quick positioning of the telescopic outer sleeve and the telescopic inner sleeve with a small space, while also releasing the external force of the electric push rod and the telescopic device, thereby reducing continuous energy loss.

[0021] The torsion spring's design enables the locking block to reset, preventing device failure due to electric actuator malfunction. Additionally, an emergency handwheel is designed at the motor tail of the electric actuator, allowing manual rotation of the handwheel to open and reset the locking block in emergencies. This improves the reliability of the locking mechanism and reduces equipment failure caused by a single component failure. It has proven effective in telescopic devices requiring high reliability and fast response times.

[0022] In addition, when the telescopic device extends or retracts, the inner telescopic sleeve can move up and down quickly under the action of external force, improving the adjustment and installation efficiency of the telescopic device.

[0023] This invention not only enables locking in a small space, but also, due to its compact structure and convenient installation, is more suitable for reliable opening, closing and locking under high vibration and high wind load conditions. It has a simple structure, high reliability and convenient maintenance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a locking mechanism according to the present invention.

[0026] Figure 2 This is a top view of the locking mechanism.

[0027] Figure 3 This is a cross-sectional view of the inner sleeve with the sleeve extended.

[0028] Figure 4This is a cross-sectional view of the inner sleeve in its retracted state.

[0029] Figure 5 This is a schematic diagram of the telescopic device in Example 5.

[0030] Figure 6 This is a flowchart of the telescopic device's operation.

[0031] In the diagram: 1. Telescopic outer sleeve, 2. Telescopic inner sleeve, 3. Torsion spring, 4. Locking block, 5. Ball joint fork, 6. Electric push rod, 41. Pad block, 51. Ball joint, 52. Lever, 53. Sleeve, 61. Stroke sensor, 62. Pin, 63. Drive motor, 64. Emergency handwheel. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1, such as Figure 1 , Figure 2 As shown, a locking mechanism includes an actuator that provides support and locking for a telescopic inner sleeve 2. The actuator is movably mounted on a telescopic outer sleeve 1, and a drive mechanism that moves the actuator is provided on the telescopic outer sleeve 1. The actuator provides support for the telescopic inner sleeve 2 based on the telescopic outer sleeve 1. The weight of the telescopic inner sleeve 2 and the working load act entirely on the actuator and are transmitted to the telescopic outer sleeve 1 through the actuator. This allows for long-term stable support of the telescopic inner sleeve 2. During the support process of the telescopic inner sleeve 2, the drive mechanism does not perform work on the telescopic inner sleeve 2, reducing continuous energy consumption and ensuring the reliability of the locking mechanism for long-term use.

[0034] Specifically, the drive mechanism drives the actuator to open, and the actuator avoids the telescopic inner sleeve 2. Then, the telescopic inner sleeve 2 is moved up and down by a winch or hydraulic cylinder to adjust the relative position between the telescopic inner sleeve 2 and the telescopic outer sleeve 1. After the position is adjusted, the drive mechanism drives the actuator to close, and the actuator locks the telescopic inner sleeve 2, so that the relative position between the telescopic inner sleeve 2 and the telescopic outer sleeve 1 is fixed.

[0035] Example 2, based on Example 1, provides a locking mechanism, such as... Figure 2As shown, the drive mechanism includes a telescopic rod disposed on the outside of the telescopic outer sleeve 1. A ball-head fork 5 is movably connected to the end of the telescopic rod, and the ball-head fork 5 is connected to the actuator. The middle part of the ball-head fork 5 is hinged to the telescopic outer sleeve 1. Specifically, the telescopic rod can be any one of an electric push rod 6, a hydraulic cylinder, or a manual screw. In this embodiment, an electric push rod 6 is selected. The tail of the electric push rod 6 is hinged to the outer wall of the telescopic outer sleeve 1, and the head of the electric push rod 6 is hinged to the ball-head fork 5. The tail of the electric push rod 6 is rotatably connected to the telescopic outer sleeve 1 via a pin 62, and the head of the electric push rod 6 is rotatably connected to the ball-head fork 5 via a pin 62. The extension and retraction of the electric push rod 6 can push the ball-head fork 5 to swing, thereby driving the actuator to move through the swing of the ball-head fork 5, realizing the opening or locking of the actuator. In addition, during the extension and retraction of the electric push rod 6, the electric push rod 6 will swing around the pin 62 at its tail, effectively avoiding interference and ensuring the smooth extension and retraction of the electric push rod 6.

[0036] In addition, the electric push rod 6 and ball head fork 5 of the drive mechanism are both located on the outside of the telescopic outer sleeve 1, without occupying the internal space of the telescopic outer sleeve 1, so that the telescopic outer sleeve 1 and the telescopic inner sleeve 2 can be more compact, and the connection stability between the telescopic outer sleeve 1 and the telescopic inner sleeve 2 can be improved.

[0037] Furthermore, the drive motor 63 of the electric push rod 6 is equipped with an emergency handwheel 64; the electric push rod 6 is also equipped with a stroke sensor 61. When the drive motor 63 malfunctions, the emergency handwheel 64 can rotate the motor shaft, thereby controlling the extension and retraction of the electric push rod 6. The emergency handwheel 64 enables the opening and resetting of the actuator, preventing device failure due to electric push rod malfunction and further improving the reliability of the locking mechanism. The stroke sensor 61 can monitor the extension and retraction length of the electric push rod 6, determining its extension state, thus allowing operators to remotely monitor the status of the actuator.

[0038] Furthermore, such as Figure 2 As shown, the ball-head fork 5 includes a lever 52 and a sleeve 53, which are slidably connected. One end of the sleeve 53 is hinged to the head of the electric push rod 6, and the other end is hinged to the telescopic outer sleeve 1. The end of the lever 52 is provided with a ball head 51, which is movably connected to the actuator. The sleeve 53 is rotatably connected to the telescopic outer sleeve 1 via a rotating shaft. The lever 52 is inserted into the sleeve 53, and the tail of the lever 52 is provided with a sliding groove. The sliding groove cooperates with the rotating shaft. During the extension and retraction of the lever 52, the rotating shaft slides in the sliding groove to avoid interference with the extension and retraction of the lever 52. This ensures that when the ball-head fork 5 swings, the lever 52 can extend and retract smoothly, thereby causing the lever 52 to drive the actuator to move.

[0039] Example 3, based on Example 2, provides a locking mechanism. The actuating component is a locking block 4. The upper part of the locking block 4 is provided with an L-shaped locking groove, which cooperates with the telescopic inner sleeve 2 inside the telescopic outer sleeve 1. A pad 41 is provided inside the L-shaped locking groove. The horizontal part of the L-shaped locking groove cooperates with the bottom surface of the telescopic inner sleeve 2, and the vertical part of the L-shaped locking groove cooperates with the side surface of the telescopic inner sleeve 2. The pad 41 is a polyurethane buffer pad, which can play a buffering role, reduce the impact when the telescopic inner sleeve 2 and the locking block 4 cooperate, and ensure the safety of the locking mechanism.

[0040] Furthermore, the lower part of the locking block 4 is rotatably connected to the telescopic outer sleeve 2 via a connecting shaft. The locking block 4 can swing around the connecting shaft. When the locking block 4 is vertical, it supports and locks the telescopic inner sleeve 1; when the locking block 4 tilts outward, it releases the support and locking of the telescopic inner sleeve 1.

[0041] Furthermore, a torsion spring 3 is provided on the connecting shaft to cooperate with the locking block 4. The torsion spring 3 continuously applies rotational force to the locking block 4. When the electric push rod 6 malfunctions, after the telescopic inner sleeve 2 extends out of the telescopic outer sleeve 1, the locking block 4 can quickly reset through the torsional force of the torsion spring 3, ensuring that the locking mechanism can smoothly lock the telescopic inner sleeve 2; thus ensuring that the locking mechanism can operate smoothly when the drive mechanism fails, improving the reliability of the locking mechanism.

[0042] Furthermore, the locking block 4 is provided with a vertically arranged elongated hole, and the ball head 51 mates with the elongated hole. During the swinging process of the locking block 4, the ball head 51 can move within the elongated hole, avoiding over-constraint during use of the locking mechanism; the swinging of the lever 52 can drive the locking block 4 to swing, realizing the opening and closing reset of the locking block 4.

[0043] Example 4, based on Example 2, provides a locking mechanism. The actuating component is a support rod, which is horizontally positioned and slidably connected to the side wall of the telescopic outer sleeve 1. The tail of the support rod is connected to a ball joint 51, and the head of the support rod extends into the telescopic outer sleeve 1. The head of the support rod has an L-shaped structure that mates with the telescopic inner sleeve 2. Specifically, the horizontal portion of the L-shaped structure mates with the bottom surface of the telescopic inner sleeve 2, and the vertical portion of the L-shaped structure mates with the side surface of the telescopic inner sleeve 2. The swinging of the ball joint fork 5 can cause the support rod to slide on the telescopic outer sleeve 1, thereby extending or retracting the support rod and providing support for the telescopic inner sleeve 2.

[0044] Furthermore, a tension spring is provided between the tail of the support rod and the telescopic outer sleeve 1. When the drive mechanism fails, the support rod will extend into the telescopic outer sleeve 1 through the action of the tension spring to provide support for the telescopic inner sleeve 2, thus ensuring the reliability of the locking mechanism.

[0045] Example 5, based on Example 3 or Example 4, provides a telescopic device including the aforementioned locking mechanism; as follows: Figure 5 As shown, the telescopic inner sleeve 2 has a backstop groove on its side wall. The locking block 4 can cooperate with the backstop groove at different positions. When the telescopic inner sleeve 2 extends to different lengths, the locking block 4 can fix the telescopic inner sleeve 2, so that the telescopic inner sleeve 2 can be used for different working conditions and improve the applicability of the telescopic device.

[0046] Furthermore, both the telescopic outer sleeve 1 and the telescopic inner sleeve 2 are square or round tubes. In this application, both the telescopic outer sleeve 1 and the telescopic inner sleeve 2 are square tubes. Two symmetrically arranged locking mechanisms are provided on the square tubes. The locking blocks 4 of the two locking mechanisms are symmetrically arranged on the two symmetrical sides of the square tubes. When the locking mechanisms lock the telescopic device, the two locking blocks 4 work together to support and lock the telescopic inner sleeve 2, ensuring the structural stability of the telescopic device and improving the load-bearing capacity of the telescopic device.

[0047] In addition, the drive mechanism is located on the outside of the telescopic outer sleeve 1, without occupying the internal space of the telescopic outer sleeve 1. This allows the inner wall of the telescopic outer sleeve 1 and the outer wall of the telescopic inner sleeve 2 to fit tightly together. The inner wall of the telescopic outer sleeve 1 limits the telescopic inner sleeve 2, ensuring the support stability of the telescopic device and preventing the telescopic inner sleeve 2 from tipping over.

[0048] Example 6, based on Example 5, provides a method of using a telescopic device, such as... Figure 6 As shown, the telescopic device is suitable for working conditions requiring rapid extension, and can achieve rapid locking and opening of the telescopic device, including: The extension process of the telescopic inner sleeve 2: as follows Figure 3 As shown, the drive mechanism drives the locking block 4 to open, and the telescopic inner sleeve 2 extends rapidly under the action of external force; after the telescopic inner sleeve 2 extends to the position, the drive mechanism pushes the locking block 4 to reset, and the locking block 4 cooperates with the bottom surface or anti-reverse groove of the telescopic inner sleeve 2, locking the telescopic inner sleeve 2; the external force driving the telescopic inner sleeve 2 to move is removed, so that the weight of the telescopic inner sleeve 2 and the working load are fully applied to the locking block 4, and transmitted to the telescopic outer sleeve 1 through the locking block 4; Specifically, the telescopic inner sleeve 2 extends under the action of external force, which in this embodiment is an upward force applied to the telescopic inner sleeve 2 by a winch or hydraulic cylinder. At the same time, the drive motor 62 is energized to retract the electric push rod 6. The electric push rod 6 drives the ball head fork 5 to swing horizontally. When the ball head fork 5 swings, the fork 52 extends, and the electric push rod 6 swings around the rotating shaft 62 to avoid interference. The ball head 51 drives the locking block 4 to flip vertically to the outside of the telescopic outer sleeve 1. After the telescopic inner sleeve 2 extends to its full position, the electric push rod 6 extends. The ball joint fork 5 swings, the fork 52 retracts, and the locking block 4 resets. At this time, the torsion spring 3 also assists in the reset. The stroke of the electric push rod 6 is monitored by the stroke sensor 61. After the locking block 4 resets, the telescopic inner sleeve 2 slowly descends to the L-shaped slot of the locking block 4 under the action of external force. The telescopic inner sleeve 2 fits against the pad 41 on the inner wall of the L-shaped slot. The locking blocks 4 on both sides work together to provide support and lock the telescopic inner sleeve 2, fixing the telescopic inner sleeve 2 in the current position and keeping it extended. Finally, the external force of the winch or hydraulic cylinder on the telescopic inner sleeve 2 is removed. During the use of the telescopic device, the winch or hydraulic cylinder does not provide support force for the telescopic inner sleeve 2. The locking block 4 provides stable support for the telescopic inner sleeve 2 for a long time.

[0049] The retraction process of the telescopic inner sleeve 2: as follows Figure 4 As shown, the telescopic inner sleeve 2 is lifted under the action of external force; the drive mechanism drives the locking block 4 to flip and open; the telescopic inner sleeve 2 is quickly lowered and reset under the action of external force, and the telescopic inner sleeve 2 is retracted.

[0050] Specifically, when the telescopic device needs to be retracted after completing its work, the telescopic inner sleeve 2 is raised to a certain displacement under the external force of the winch or hydraulic cylinder, providing space for the locking block 4 to flip, so that the locking block 4 can be disengaged from the telescopic inner sleeve 2. The electric push rod 6 retracts, and the electric push rod 6 drives the ball head fork 5 to swing horizontally. The ball head 51 drives the locking block 4 to flip vertically to the outside of the telescopic outer sleeve 1. The telescopic inner sleeve 2 is retracted into the telescopic outer sleeve 1 under the action of external force.

[0051] Furthermore, when the telescopic inner sleeve 2 needs to extend but the electric push rod 6 cannot move, due to the L-shaped slot design of the locking block 4, the telescopic inner sleeve 2 can also be directly pushed open by external force to achieve normal extension. After the telescopic inner sleeve 2 is extended to the correct position, the locking block 4 can automatically reset and lock the telescopic inner sleeve 2 under the action of the torsion spring 3. The entire telescopic device can automatically extend without the aid of external force, which improves the reliability of the locking device.

[0052] Example 7, based on Example 6, provides a method for using a telescopic device. When the telescopic device experiences an abnormal power outage, the emergency handwheel 64 can be used to lock and unlock the device. Specifically, the extension process of the inner telescopic sleeve 2 is as follows: the operator rotates the main shaft of the drive motor 63 via the emergency handwheel 64, causing the electric push rod 6 to retract. The electric push rod 6 drives the ball head fork 5 to swing horizontally. When the ball head fork 5 swings, the fork 52 extends, and the electric push rod 6 swings around the rotating shaft 62 to avoid interference. The ball head 51 drives the locking block 4 to vertically flip to the outside of the outer telescopic sleeve 1. The inner telescopic sleeve 2 extends under the action of external force, etc. After the inner telescopic sleeve 2 extends to its full position, the operator... Personnel reverse the rotation of the drive motor 64 via the emergency handwheel 64, causing the electric push rod 6 to extend, which in turn causes the ball joint fork 5 to swing. The fork 52 retracts, and the locking block 4 resets. The locking block 4 engages with the bottom surface or anti-reverse groove of the telescopic inner sleeve 2. At this time, the torsion spring 3 also assists in the reset. The stroke of the electric push rod 6 is monitored by the stroke sensor 61. After the locking block 4 resets, the telescopic inner sleeve 2 slowly descends to the L-shaped slot of the locking block 4 under the action of external force. The telescopic inner sleeve 2 adheres to the pad 41 on the inner wall of the L-shaped slot. The locking blocks 4 on both sides work together to provide support and lock the telescopic inner sleeve 2, fixing the telescopic inner sleeve 2 in the current position and keeping it extended.

[0053] The retraction process of the telescopic inner sleeve 2 is as follows: Under the external force of the winch or hydraulic cylinder, the telescopic inner sleeve 2 is raised by a certain displacement, providing space for the locking block 4 to flip, making it easier for the locking block 4 to disengage from the telescopic inner sleeve 2; the operator rotates the main shaft of the drive motor 63 through the emergency handwheel 64 to retract the electric push rod 6, the electric push rod 6 drives the ball head fork 5 to swing horizontally, and the ball head 51 drives the locking block 4 to flip vertically to the outside of the telescopic outer sleeve 1, and the telescopic inner sleeve 2 is retracted into the telescopic outer sleeve 1 under the action of external force; when the telescopic inner sleeve 2 is retracted to the end, the operator rotates the main shaft of the drive motor 63 through the emergency handwheel 64 to extend the electric push rod 6, the electric push rod 6 drives the ball head fork 5 to swing horizontally, and the ball head 51 drives the locking block 4 to flip vertically to a state of contact with the side of the telescopic inner sleeve 2, at which time the force of the torsion spring 3 can be minimized as much as possible to ensure the stability of the telescopic device in the stored state.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A locking mechanism, characterized in that It includes an actuator that provides support and a drive mechanism that drives the actuator to move. The drive mechanism includes a telescopic rod and a ball-head fork (5). The end of the telescopic rod is movably connected to the ball-head fork (5), and the ball-head fork (5) is connected to the actuator. The ball head fork (5) includes a lever (52) and a sleeve (53), which are slidably connected; the actuator is a locking block (4), which has a vertically arranged elongated hole, and the end of the lever (52) has a ball head (51) that mates with the elongated hole. The actuator is movably mounted on the telescopic outer sleeve (1), the telescopic rod is mounted on the outside of the telescopic outer sleeve (1), and the ball head fork (5) is hinged to the telescopic outer sleeve (1); The tail of the telescopic rod is hinged to the outer wall of the telescopic sleeve (1), and the head of the telescopic rod is hinged to the ball head fork (5). One end of the sleeve (53) is hinged to the head of the telescopic rod, and the other end of the sleeve (53) is hinged to the telescopic outer sleeve (1); The lower part of the locking block (4) is rotatably connected to the telescopic outer sleeve (1) via a connecting shaft.

2. The locking mechanism according to claim 1, characterized in that, The telescopic rod is an electric push rod (6).

3. The locking mechanism according to claim 1, characterized in that, An emergency handwheel (64) is provided on the drive motor (63) of the electric push rod (6); a stroke sensor (61) is provided on the electric push rod (6).

4. The locking mechanism according to claim 1, characterized in that, The upper part of the card block (4) is provided with an L-shaped card slot, which is matched with the telescopic inner sleeve (2) inside the telescopic outer sleeve (1).

5. The locking mechanism according to claim 4, characterized in that, A torsion spring (3) is provided on the connecting shaft to cooperate with the locking block (4).

6. The locking mechanism according to claim 4 or 5, characterized in that, A pad (41) is provided on the inside of the L-shaped slot.

7. A telescopic device, characterized in that, Includes the locking mechanism as described in any one of claims 1 to 6; the side wall of the telescopic inner sleeve (2) is provided with a backstop groove.

8. A method of using the telescopic device as described in claim 7, characterized in that, include: Extension process of telescopic inner sleeve (2): The drive mechanism drives the locking block (4) to open, and the telescopic inner sleeve (2) extends quickly under the action of external force; After the telescopic inner sleeve (2) extends to the position, the drive mechanism pushes the locking block (4) to reset, and the locking block (4) cooperates with the bottom surface or anti-reverse groove of the telescopic inner sleeve (2), and the locking block (4) locks the telescopic inner sleeve (2); The external force driving the telescopic inner sleeve (2) to move is canceled, so that the weight of the telescopic inner sleeve (2) and the working load are fully applied to the locking block (4), and transmitted to the telescopic outer sleeve (1) through the locking block (4); Telescopic inner sleeve (2) retraction process: The telescopic inner sleeve (2) is lifted under the action of external force; The drive mechanism causes the locking block (4) to flip and open; the telescopic inner sleeve (2) is quickly lowered and reset under the action of external force, and the telescopic inner sleeve (2) is retracted.

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