A self-locking device and method for movable outriggers of a wheeled crane, and the wheeled crane itself.

Abstract

This invention discloses a self-locking device, method, and wheeled crane for a movable outrigger. The self-locking device includes: a limiting device for limiting the movable outrigger when it moves to a designated position; a rocker arm for controlling the limiting state of the limiting device; a locking mechanism for driving the rocker arm to move up and down; and a triggering mechanism for engaging the locking mechanism when the movable outrigger moves to the designated position, thereby triggering the locking mechanism to operate. This invention utilizes the triggering mechanism, limiting device, and rocker arm to achieve automatic locking when the movable outrigger extends or retracts to a designated position, avoiding potential safety hazards caused by human error and enhancing vehicle safety.

Description

Technical Field

[0001] This invention relates to a self-locking device and method for movable outriggers of a wheeled crane, and to a wheeled crane in general, belonging to the field of wheeled crane machinery technology. Background Technology

[0002] In wheeled cranes, movable outriggers are often connected to hydraulic horizontal cylinders, and the extension and retraction of the outriggers are achieved through a hydraulic system. Normally, the hydraulic system has a built-in locking function to prevent accidental extension of the horizontal cylinder that could extend the movable outriggers. For safety reasons, many manufacturers often use additional mechanical locking devices, such as using limit pins to connect the movable and fixed outriggers, adding another layer of protection against accidental extension. However, this additional protection requires manual insertion of the pins when the movable outriggers retract, and if this is forgotten, the protection becomes completely ineffective. While existing movable outrigger locking devices are simple and practical, they lack automatic locking and require manual operation of the limit devices, resulting in poor error prevention and potential safety hazards. Summary of the Invention

[0003] The purpose of this invention is to provide a self-locking device and method for movable outriggers of a wheeled crane, and a wheeled crane in which a rocker arm is used to automatically lock the movable outriggers when they extend or retract.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] In one aspect, the present invention provides a self-locking device for movable outriggers of a wheeled crane, comprising:

[0006] The limiting device is used to limit the movement of the outriggers of a wheeled crane when they reach a designated position.

[0007] A rocker, wherein the limiting device is fixed to one end of the rocker, and the rocker is used to control the limiting state of the limiting device;

[0008] A locking mechanism is provided, with the other end of the rocker connected to the locking mechanism, which is used to drive the rocker to move up and down.

[0009] A triggering mechanism is provided on the movable outrigger of the wheeled crane. The triggering mechanism is used to abut against the locking mechanism when the movable outrigger moves to a designated position, and the triggering mechanism is used to trigger the locking mechanism to act.

[0010] The locking mechanism is fixed to the fixed outrigger of the wheeled crane.

[0011] Furthermore, the triggering mechanism includes a first triggering device and a second triggering device;

[0012] The first triggering device and the second triggering device are respectively located at both ends of the movable outrigger of the wheeled crane, and their positions are determined according to the stroke of the horizontal cylinder.

[0013] On the movable support leg, a first limiting hole is provided on the left side of the first triggering device, and a second limiting hole is provided on the left side of the second triggering device.

[0014] Furthermore, a third limiting hole is provided on the fixed support leg, directly below the limiting device.

[0015] Furthermore, when the first triggering device moves to the designated position with the movable outrigger and abuts against the locking mechanism, the third limiting hole is directly opposite the first limiting hole;

[0016] When the second triggering device moves to the designated position with the movable outrigger and abuts against the locking mechanism, the third limiting hole is aligned with the second limiting hole.

[0017] Furthermore, both the first triggering device and the second triggering device are wedge-shaped blocks.

[0018] Furthermore, the fixed support leg is provided with a rocker plate support;

[0019] The rocker support includes a base and a pin. The base is welded to a fixed leg, and the pin is fixed to the base. The rocker can rotate around the pin.

[0020] Furthermore, the locking mechanism includes a fixing device and a moving device;

[0021] The fixing device is used to fix the locking mechanism to the fixed support leg;

[0022] The movable device is used to move the rocker up and down under the drive of an external force.

[0023] Furthermore, the fixing device includes a first sleeve and a stiffening plate;

[0024] The stiffening plate is assembled outside the first sleeve, and the first sleeve is fixed to the fixed leg by the stiffening plate.

[0025] The movable device includes a handle, a second lug, a shaft, a second sleeve, and a first lug;

[0026] The handle is installed at one end of the shaft, a spring is fitted onto the outside of the shaft and assembled into the first sleeve; the other end of the shaft is placed inside the second sleeve;

[0027] The first pin lug passes through the second sleeve and is fixed on the shaft;

[0028] The second pin lug is fixed to the end of the shaft near the handle; the rocker arm is fixed to the end of the shaft near the second sleeve;

[0029] The first and second pins are perpendicular to each other.

[0030] The first sleeve has a notch for the second pin lug to move up and down within the notch.

[0031] Furthermore, the notch is a T-shaped notch.

[0032] Furthermore, the stiffening plate is fixed to the fixed support leg by welding or by assembly.

[0033] A second aspect of the present invention provides a self-locking method for movable outriggers of a wheeled crane, comprising:

[0034] The steps for retracting the movable outrigger when it is extended, and the steps for extending the movable outrigger when it is retracted;

[0035] The step of retracting the movable outrigger when it is extended includes:

[0036] The aforementioned self-locking device for movable outriggers of wheeled cranes is installed on the fixed outriggers and movable outriggers of the wheeled crane. When the locking mechanism in the self-locking device is pressed, the locking mechanism drives one end of the rocker plate downward, causing the other end of the rocker plate to lift upward, thereby driving the limiting device to lift and changing the limiting state of the limiting device; causing the movable outrigger to retract under the push of the horizontal hydraulic cylinder.

[0037] When the movable support leg retracts to the designated position, the first triggering device abuts against the locking mechanism, triggering the locking mechanism to move upward, which in turn drives the limiting device to move downward through the rocker, causing the limiting device to fall into the third limiting hole of the fixed support leg and the first limiting hole of the movable support leg, thereby limiting the movable support leg.

[0038] The step of extending the movable outrigger in the retracted state includes:

[0039] The aforementioned self-locking device for movable outriggers of wheeled cranes is installed on the fixed outriggers and movable outriggers of the wheeled crane. When the locking mechanism in the self-locking device is pressed, the locking mechanism drives one end of the rocker plate downward, causing the other end of the rocker plate to lift upward, thereby driving the limiting device to lift and changing the limiting state of the limiting device; causing the movable outrigger to extend under the push of the horizontal hydraulic cylinder.

[0040] When the movable outrigger extends to the designated position, the second triggering device abuts against the locking mechanism, triggering the locking mechanism to move upward. This causes the rocker plate to move the limiting device downward, so that the limiting device falls into the third limiting hole of the fixed outrigger and the second limiting hole of the movable outrigger, thereby limiting the movable outrigger.

[0041] A third aspect of the present invention discloses a self-locking method for movable outriggers of a wheeled crane, comprising:

[0042] The steps for retracting the movable outrigger when it is extended, and the steps for extending the movable outrigger when it is retracted;

[0043] The step of retracting the movable outrigger when it is extended includes:

[0044] The aforementioned self-locking device for the movable outriggers of the wheeled crane is installed on the fixed and movable outriggers. Pressing the handle in the locking mechanism causes one end of the shaft in the locking mechanism and the rocker connected thereto to move downwards, while the limiting device connected to the other end of the rocker moves upwards around the pin shaft supporting the rocker, causing the limiting device to be pulled out of the limiting hole; the movable outrigger is then retracted under the push of the horizontal hydraulic cylinder.

[0045] When the movable support leg retracts to the designated position, the first triggering device on the movable support leg pushes the first pin lug in the locking mechanism to rotate to the notch reserved on the fixed support leg. The first pin lug drives the shaft to rotate, causing the second pin lug to rotate into the notch reserved on the first sleeve. Under the action of the spring, the second sleeve and the first pin lug are lifted, releasing the fixed support leg from locking the locking device. One end of the rocker connected to the shaft in the locking mechanism moves upward, and the limiting device connected to the other end of the rocker moves downward around the pin shaft supported by the rocker, passing through the third limiting hole on the fixed support leg and the first limiting hole on the movable support leg, thus limiting the movable support leg.

[0046] The step of extending the movable outrigger in the retracted state includes:

[0047] The aforementioned self-locking device for the movable outriggers of the wheeled crane is installed on the fixed and movable outriggers. Pressing the handle in the locking mechanism causes one end of the shaft in the locking mechanism and the rocker connected thereto to move downwards, while the limiting device connected to the other end of the rocker moves upwards around the pin shaft supporting the rocker, causing the limiting device to be pulled out of the limiting hole; the movable outrigger extends under the push of the horizontal hydraulic cylinder.

[0048] When the movable support leg extends to the designated position, the second triggering device on the movable support leg pushes the first pin lug in the locking mechanism to rotate to the notch reserved on the fixed support leg. The first pin lug drives the shaft to rotate, causing the second pin lug to rotate into the notch reserved on the first sleeve. Under the action of the spring, the second sleeve and the first pin lug are lifted, releasing the fixed support leg from locking the locking device. This causes one end of the rocker connected to the shaft in the locking mechanism to move upward, and the limiting device connected to the other end of the rocker moves downward around the pin shaft supported by the rocker, passing through the third limiting hole on the fixed support leg and the second limiting hole on the movable support leg, thus limiting the movable support leg.

[0049] The fourth aspect of the present invention is a wheeled crane, characterized in that the fixed outriggers and movable outriggers of the wheeled crane are equipped with the aforementioned self-locking device for movable outriggers of wheeled cranes.

[0050] The beneficial effects of this invention are as follows:

[0051] This invention provides a self-locking device for movable outriggers of wheeled cranes. It retains the original main structure of the outriggers and uses a triggering mechanism, a limiting device, and a rocker arm to automatically lock the movable outriggers when they are extended or retracted to a designated position. This avoids potential safety hazards caused by human error and enhances vehicle safety. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the self-locking device for the movable outrigger of a wheeled crane provided in an embodiment of the present invention in the extended outrigger state;

[0053] Figure 2 This is a schematic diagram of the self-locking device for movable outriggers of a wheeled crane in the retracted state, as provided in an embodiment of the present invention.

[0054] Figure 3 This is an example of a limiting device in the self-locking device for movable outriggers of a wheeled crane provided in an embodiment of the present invention;

[0055] Figure 4 A schematic diagram of another self-locking device for movable outriggers of a wheeled crane in the retracted state, provided in an embodiment of the present invention;

[0056] Figure 5 This is a schematic diagram of a locking mechanism in a self-locking device for movable outriggers of a wheeled crane provided in an embodiment of the present invention.

[0057] Figure 6 for Figure 5 The diagram shows an exploded view of the fixing and moving parts of the locking mechanism. Detailed Implementation

[0058] The present invention will now be further described. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0059] Example 1

[0060] This invention provides a self-locking device for movable outriggers of a wheeled crane, see below. Figure 1 and Figure 2 It includes a triggering mechanism, a locking mechanism 3, a limit device 5, and a rocker 6.

[0061] In this embodiment, the triggering mechanism includes a first triggering device 2 and a second triggering device 7, which are located at the upper ends of the movable support leg 1; their left and right positions are determined according to the stroke of the horizontal cylinder.

[0062] On the movable support leg 1, a first limiting hole is provided on the left side of the first triggering device 2, and a second limiting hole is provided on the left side of the second triggering device 7.

[0063] The locking mechanism 3 is mounted on the fixed support leg 4; the bottom of the locking mechanism 3 is connected to one end of the rocker plate 6, and the other end of the rocker plate 6 is fixed with the limiting device 5.

[0064] A third limiting hole is provided directly below the limiting device 5 on the fixed support leg.

[0065] It should be noted that when the first triggering device 2 abuts against the locking mechanism 3, the third limiting hole is directly opposite the first limiting hole; when the second triggering device 7 abuts against the locking mechanism 3, the third limiting hole is directly opposite the second limiting hole.

[0066] Using the self-locking device of this embodiment, when the movable outrigger extends to the designated position, such as Figure 1 As shown, the second triggering device 7 triggers the locking mechanism 3 to move upward, which in turn drives the limiting device 5 to move downward through the rocker plate 6. The limiting device 5 falls into the third limiting hole of the fixed leg and the second limiting hole of the movable leg 1, thereby limiting the movement of the movable leg.

[0067] See Figure 2 When the movable outrigger 1 needs to be retracted from its extended position, pressing the locking mechanism 3 raises the rocker arm 6, opening the limiting device 5. At this time, the movable outrigger 1 can retract under the push of the horizontal hydraulic cylinder. When retracted to the designated position, the first triggering device 2 triggers the locking mechanism 3 to move upward, which in turn drives the limiting device 5 downward through the rocker arm 6. The limiting device 5 falls into the third limiting hole of the fixed outrigger and the first limiting hole of the movable outrigger 1, thus restricting the movement of the movable outrigger.

[0068] When it is necessary to extend the movable outrigger 1 again, press down the locking mechanism 3, lift the rocker 6, and the limiting device 5 fixed at the end of the rocker 6 will be pulled out, so that the movable outrigger can be extended freely.

[0069] See Figure 3 This is an example of the limiting device 5 falling into the limiting hole. Figure 3 The number 8 in the figure represents the trajectory of the limiting device as it falls.

[0070] In a preferred embodiment, the triggering mechanism can be a wedge-shaped block or any other shape, with the purpose of triggering the locking mechanism, thereby triggering the rocker to move up and down.

[0071] In a preferred embodiment, the fixed support leg 4 is provided with a rocker support 9, see [reference]. Figure 4 The rocker support 9 supports the rocker 6. The rocker support includes a base and a pin. The base is welded to the fixed leg, and the pin is fixed to the base (the fixing method can be detachable or non-detachable). The rocker can rotate around the pin.

[0072] As a preferred embodiment, the locking mechanism 3 can also be located on the side and below the outrigger.

[0073] Example 2

[0074] This embodiment provides a self-locking method for movable outriggers of a wheeled crane, based on the self-locking device of Embodiment 1. The method includes:

[0075] The steps for retracting the movable outrigger when it is extended, and the steps for extending the movable outrigger when it is retracted;

[0076] The steps for retracting the movable outrigger when it is extended include:

[0077] Pressing the locking mechanism in the self-locking device causes one end of the rocker to move downwards, while the other end of the rocker moves upwards, causing the limiting device to move up and changing the limiting state of the limiting device; the movable support leg retracts under the push of the horizontal cylinder.

[0078] When the movable support leg retracts to the designated position, the first triggering device abuts against the locking mechanism, triggering the locking mechanism to move upward, which in turn drives the limiting device to move downward through the rocker, causing the limiting device to fall into the third limiting hole of the fixed support leg and the first limiting hole of the movable support leg, thereby limiting the movable support leg.

[0079] The steps for extending the movable outrigger when it is in the retracted position include:

[0080] Pressing the locking mechanism in the self-locking device causes one end of the rocker to move downwards, while the other end of the rocker moves upwards, causing the limiting device to move up and changing the limiting state of the limiting device; the movable support leg extends under the push of the horizontal cylinder.

[0081] When the movable outrigger extends to the designated position, the second triggering device abuts against the locking mechanism, triggering the locking mechanism to move upward. This causes the rocker plate to move the limiting device downward, so that the limiting device falls into the third limiting hole of the fixed outrigger and the second limiting hole of the movable outrigger, thereby limiting the movable outrigger.

[0082] Example 3

[0083] Based on Embodiment 1, in this embodiment, the locking mechanism 3 consists of two parts: a fixed device and a movable device. See [link to embodiment 1]. Figure 5 and Figure 6 The fixing device includes a first sleeve 11-1 and a stiffening plate 11-2, which are welded together. The fixing device is installed on the fixed support leg through the stiffening plate 11-2. The first sleeve 11-1 has a notch, the width of which is approximately equal to the diameter of the second pin lug 10-2. When the second pin lug 10-2 is wrapped around the notch, it can be accommodated.

[0084] The movable device includes a handle 10-1, a second lug 10-2, a shaft 10-3, a second sleeve 12-1, and a first lug 12-2.

[0085] The handle 10-1 is mounted on one end of the shaft 10-3. The outer sleeve of the shaft 10-3, fitted with a spring, is then assembled inside the first sleeve 11-1. The other end of the shaft 10-3 is assembled inside the second sleeve 12-1. The first lug 12-2 passes through the second sleeve 12-1 and is fixed to the shaft 10-3. The second lug 10-2 is fixed to the end of the shaft 10-3 near the handle 10-1. The rocker arm 6 is mounted on the end of the shaft 10-3 near the second sleeve 12-1.

[0086] The first lug 12-2 and the second lug 10-2 can be fixed on the pin shaft by welding or interference fit, and the first lug 12-2 and the second lug 10-2 are perpendicular to each other.

[0087] In the locking mechanism 3 of this embodiment, when locked, the second pin lug 10-2 is located at both ends of the horizontal notch of the first sleeve 11-1, and the first pin lug rotates at the same angle as the second pin lug. At this time, the first pin lug is below the fixed leg cover plate. When the movable leg 1 is about to retract, the first pin lug 12-2 is rotated toward the first triggering device 2. During the retraction of the movable leg, the first triggering device 2 on the movable leg pushes the first pin lug 12-2 in the locking mechanism 3 to rotate to the notch reserved on the fixed leg. The first pin lug 12-2 drives the shaft 10-3 to rotate, thereby causing the second pin lug 10-2 to rotate into the horizontal notch reserved on the first sleeve 11-1. Under the action of the spring, the second sleeve 12-1 and the first pin lug 12-2 are lifted, thereby releasing the locking device of the fixed leg. Meanwhile, driven by the compression spring inside the first sleeve 11-1, the shaft 10-3 in the locking mechanism and one end of the rocker 6 connected to it move upward. At this time, the limiting device 5 at the other end connected to the rocker 6 moves downward around the pin shaft of the rocker support, passes through the third limiting hole on the fixed leg and the first limiting hole on the movable leg, and finally realizes the mechanical locking of the movable leg.

[0088] It should be noted that the first sleeve 11-1 has two notches, a horizontal notch and a vertical notch. When retracted, the second pin lug 10-2 should be in the vertical notch position, at which point the pin is locked. To extend the outrigger, the pin limit must be unlocked first. This requires pressing and rotating the handle to rotate the second pin lug 10-2 to the horizontal notch position, thereby releasing the pin limit and extending the outrigger.

[0089] When the movable outrigger needs to be extended, press the handle 10-1 in the locking mechanism, and then rotate the second pin lug 10-2 to the horizontal notch position of the first sleeve 11-1. At this time, the shaft 10-3 in the locking mechanism and one end of the rocker 6 connected to it move downwards, while the limiting device 5 connected to the other end of the rocker 6 moves upwards around the pin shaft supported by the rocker. The limiting device is pulled out from the first limiting hole, thereby releasing the mechanical lock on the movable outrigger. During the extension of the movable outrigger, the second triggering device 7 on the movable outrigger pushes the first pin lug 12-2 in the locking mechanism 3 to rotate to the notch reserved for the fixed outrigger. The first pin lug 12-2 drives the shaft 10-3 to rotate, thereby causing the second pin lug 10-2 to rotate into the notch reserved for the first sleeve 11-1. Under the action of the spring, the second sleeve 12-1 and the first pin lug 12-2 are lifted, thereby releasing the lock of the fixed outrigger on the locking device. Meanwhile, driven by the compression spring inside the first sleeve 11-1, the shaft 10-3 in the locking mechanism and one end of the rocker 6 connected to it move upward, while the limiting device 5 at the other end connected to the rocker 6 moves downward around the pin shaft of the rocker support, passing through the third limiting hole on the fixed leg and the second limiting hole on the movable leg, and finally realizing the mechanical locking of the movable leg.

[0090] It should be noted that after pressing the handle 10-1 to pull out the limiting device 5, the second pin lug 10-2 is rotated towards the direction of the second triggering device 7, so that the second triggering device 7 can trigger the first pin lug 12-2 during the extension of the movable outrigger, thereby achieving the purpose of locking the outrigger again. The first pin lug 12-2 and the second pin lug 10-2 rotate synchronously, both turning towards the wedge block 2. Only in this way can the wedge block 2 trigger the first pin lug 12-2 when it extends, thereby driving the second pin lug 10-2 to rotate synchronously to the vertical notch position of the sleeve 11-1.

[0091] As a preferred embodiment, the notch on the first sleeve 11-1 is a T-shaped notch, that is, it includes a horizontal notch and a vertical notch, which can ensure that the second pin lug 10-2 can rotate counterclockwise and clockwise when the outrigger is unlocked.

[0092] In one preferred embodiment, the stiffening plate 11-2 can be installed on the fixed support leg by welding or assembly.

[0093] In other embodiments of the present invention, methods such as electricity, gas, or liquid are used to control the rocker to achieve the purpose of locking the outriggers.

[0094] Example 4

[0095] This embodiment provides a wheeled crane, on which the fixed outriggers and movable outriggers are equipped with the self-locking device for movable outriggers of the wheeled crane described in Embodiment 1 or Embodiment 3.

[0096] Terminology Explanation

[0097] Wheeled crane: A rotating boom crane that travels using a tire-mounted chassis.

[0098] Fixed outrigger: A box-shaped structure made of sheet metal welded together, used to connect the movable outrigger and the frame.

[0099] Movable outriggers: A box-shaped structure made of welded sheet metal that can extend and retract to support cranes.

[0100] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A self-locking device for movable outriggers of a wheeled crane, characterized in that, include: The limiting device is used to limit the movement of the outriggers of a wheeled crane when they reach a designated position. A rocker, wherein the limiting device is fixed to one end of the rocker, and the rocker is used to control the limiting state of the limiting device; A locking mechanism is provided, with the other end of the rocker connected to the locking mechanism, which is used to drive the rocker to move up and down. A triggering mechanism is provided on the movable outrigger of the wheeled crane. The triggering mechanism is used to abut against the locking mechanism when the movable outrigger moves to a designated position, and the triggering mechanism is used to trigger the locking mechanism to act. The triggering mechanism includes a first triggering device and a second triggering device; the first triggering device and the second triggering device are respectively located at both ends of the movable outrigger of the wheeled crane, and their positions are determined according to the stroke of the horizontal cylinder; on the movable outrigger, a first limiting hole is provided on the left side of the first triggering device, and a second limiting hole is provided on the left side of the second triggering device; The locking mechanism is fixed to the fixed outrigger of the wheeled crane. A third limiting hole is provided on the fixed outrigger, directly below the limiting device. When the first triggering device moves to a designated position with the movable outrigger and abuts against the locking mechanism, the third limiting hole is directly opposite the first limiting hole. When the second triggering device moves to a designated position with the movable outrigger and abuts against the locking mechanism, the third limiting hole is directly opposite the second limiting hole. When the movable outrigger extends to the designated position, the second triggering device triggers the locking mechanism to move upward, which in turn drives the limiting device to move downward through the rocker plate. The limiting device falls into the third limiting hole of the fixed outrigger and the second limiting hole of the movable outrigger, thereby restricting the movement of the movable outrigger. When the movable outrigger needs to be retracted from its extended position, pressing the locking mechanism raises the rocker arm, opening the limiting device. At this time, the movable outrigger retracts under the push of the horizontal hydraulic cylinder. When it retracts to the designated position, the first triggering device triggers the locking mechanism to move upward, which in turn drives the limiting device to move downward through the rocker arm. The limiting device falls into the third limiting hole of the fixed outrigger and the first limiting hole of the movable outrigger, thus restricting the movement of the movable outrigger.

2. The self-locking device for movable outriggers of a wheeled crane according to claim 1, characterized in that, Both the first triggering device and the second triggering device are wedge-shaped blocks.

3. The self-locking device for movable outriggers of a wheeled crane according to claim 1, characterized in that, The fixed support leg is equipped with a rocker plate for support; The rocker support includes a base and a pin. The base is welded to a fixed leg, and the pin is fixed to the base. The rocker can rotate around the pin.

4. The self-locking device for movable outriggers of a wheeled crane according to claim 1, characterized in that, The locking mechanism includes a fixing device and a movable device; The fixing device is used to fix the locking mechanism to the fixed support leg; The movable device is used to move the rocker up and down under the drive of an external force.

5. The self-locking device for movable outriggers of a wheeled crane according to claim 4, characterized in that, The fixing device includes a first sleeve and a stiffening plate; The stiffening plate is assembled outside the first sleeve, and the first sleeve is fixed to the fixed leg by the stiffening plate. The movable device includes a handle, a second lug, a shaft, a second sleeve, and a first lug; The handle is installed at one end of the shaft, a spring is fitted onto the outside of the shaft and assembled into the first sleeve; the other end of the shaft is placed inside the second sleeve; The first pin lug passes through the second sleeve and is fixed on the shaft; The second pin lug is fixed to the end of the shaft near the handle; the rocker arm is fixed to the end of the shaft near the second sleeve. The first and second pins are perpendicular to each other. The first sleeve has a notch for the second pin lug to move up and down within the notch.

6. The self-locking device for movable outriggers of a wheeled crane according to claim 5, characterized in that, The notch is a T-shaped notch.

7. The self-locking device for movable outriggers of a wheeled crane according to claim 5, characterized in that, The stiffening plate is fixed to the fixed leg by welding or by assembly.

8. A self-locking method for movable outriggers of a wheeled crane, characterized in that, include: The steps for retracting the movable outrigger when it is extended, and the steps for extending the movable outrigger when it is retracted; The step of retracting the movable outrigger when it is extended includes: The fixed outrigger and movable outrigger of the wheeled crane are equipped with the movable outrigger self-locking device of any one of claims 1 to 3. When the locking mechanism in the self-locking device is pressed, the locking mechanism drives one end of the rocker plate downward, causing the other end of the rocker plate to rise upward, thereby driving the limiting device to rise and changing the limiting state of the limiting device; the movable outrigger is then retracted under the push of the horizontal hydraulic cylinder. When the movable support leg retracts to the designated position, the first triggering device abuts against the locking mechanism, triggering the locking mechanism to move upward, which in turn drives the limiting device to move downward through the rocker, causing the limiting device to fall into the third limiting hole of the fixed support leg and the first limiting hole of the movable support leg, thereby limiting the movable support leg. The step of extending the movable outrigger in the retracted state includes: The fixed outrigger and movable outrigger of the wheeled crane are equipped with the movable outrigger self-locking device for the wheeled crane as described in any one of claims 1 to 3. When the locking mechanism in the self-locking device is pressed, the locking mechanism drives one end of the rocker plate downward, causing the other end of the rocker plate to lift upward, thereby driving the limiting device to lift and changing the limiting state of the limiting device; causing the movable outrigger to extend under the push of the horizontal hydraulic cylinder. When the movable outrigger extends to the designated position, the second triggering device abuts against the locking mechanism, triggering the locking mechanism to move upward. This causes the rocker plate to move the limiting device downward, so that the limiting device falls into the third limiting hole of the fixed outrigger and the second limiting hole of the movable outrigger, thereby limiting the movable outrigger.

9. A self-locking method for movable outriggers of a wheeled crane, characterized in that, include: The steps for retracting the movable outrigger when it is extended, and the steps for extending the movable outrigger when it is retracted; The step of retracting the movable outrigger when it is extended includes: The wheeled crane is equipped with a self-locking device for the movable outrigger as described in any one of claims 5 to 7. Pressing the handle in the locking mechanism causes one end of the shaft in the locking mechanism and the rocker arm connected thereto to move downwards, while a limiting device connected to the other end of the rocker arm moves upwards around the pin shaft supporting the rocker arm, causing the limiting device to be pulled out of the limiting hole; the movable outrigger is then retracted under the push of a horizontal hydraulic cylinder. When the movable support leg retracts to the designated position, the first triggering device on the movable support leg pushes the first pin lug in the locking mechanism to rotate to the notch reserved on the fixed support leg. The first pin lug drives the shaft to rotate, causing the second pin lug to rotate into the notch reserved on the first sleeve. Under the action of the spring, the second sleeve and the first pin lug are lifted, releasing the fixed support leg from locking the locking device. One end of the rocker connected to the shaft in the locking mechanism moves upward, and the limiting device connected to the other end of the rocker moves downward around the pin shaft supported by the rocker, passing through the third limiting hole on the fixed support leg and the first limiting hole on the movable support leg, thus limiting the movable support leg. The step of extending the movable outrigger in the retracted state includes: The fixed and movable outriggers of the wheeled crane are equipped with the self-locking device for the movable outriggers of the wheeled crane as described in any one of claims 5 to 7. Pressing the handle in the locking mechanism causes one end of the shaft in the locking mechanism and the rocker arm connected thereto to move downwards, while a limiting device connected to the other end of the rocker arm moves upwards around the pin shaft supporting the rocker arm, causing the limiting device to be pulled out of the limiting hole; the movable outrigger extends under the push of the horizontal hydraulic cylinder. When the movable support leg extends to the designated position, the second triggering device on the movable support leg pushes the first pin lug in the locking mechanism to rotate to the notch reserved on the fixed support leg. The first pin lug drives the shaft to rotate, causing the second pin lug to rotate into the notch reserved on the first sleeve. Under the action of the spring, the second sleeve and the first pin lug are lifted, releasing the fixed support leg from locking the locking device. This causes one end of the rocker connected to the shaft in the locking mechanism to move upward, and the limiting device connected to the other end of the rocker moves downward around the pin shaft supported by the rocker, passing through the third limiting hole on the fixed support leg and the second limiting hole on the movable support leg, thus limiting the movable support leg.

10. A wheeled crane, characterized in that, The fixed outriggers and movable outriggers of the wheeled crane are equipped with the self-locking device for movable outriggers of the wheeled crane as described in any one of claims 1 to 7.

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