Locking device, support leg and engineering machine

Abstract

This utility model discloses a locking device, outrigger, and engineering machinery. The locking device includes a self-locking component and an unlocking drive. The first end of the locking rod of the self-locking component is rotatably mounted on one of the telescopic part and the fixed part of the telescopic component. The second end of the locking rod is provided with a locking tongue. A locking seat is provided on the other of the telescopic part and the fixed part. The locking seat is provided with a wedge-shaped guide surface and a locking space in sequence along the direction away from the first end of the locking rod. When the telescopic part is retracted, the wedge-shaped guide surface abuts against the locking tongue and raises the locking tongue until the locking tongue slides into the locking space for self-locking. The unlocking drive is provided on either the telescopic part and the fixed part and is designed to drive the second end of the locking rod to raise the locking tongue out of the locking space. Even if the hydraulic lock fails, the locking device can mechanically lock the outrigger cylinder, thereby preventing dangerous accidents caused by the outrigger accidentally extending during operation.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and in particular relates to a locking device, outriggers, and engineering machinery. Background Technology

[0002] Outriggers are support devices used in construction machinery to enhance stability and prevent equipment from becoming unstable or tipping over during construction due to workload, terrain, and other factors. Under normal operation, the outriggers are typically deployed, with their hydraulic cylinders extending to support the ground and ensure the stability of the vehicle during operation. During travel, the outriggers must be retracted. When the outriggers are fully retracted, the stroke of the outrigger cylinders is locked by a hydraulic lock. However, the hydraulic lock is susceptible to failure, and the outriggers could unexpectedly extend during travel, leading to a dangerous accident. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies, this utility model provides a locking device, outrigger, and engineering machinery, aiming to solve the technical problem that the outrigger may accidentally extend during operation due to the risk of failure of the hydraulic lock.

[0004] To achieve the above objectives, the first aspect of this utility model provides a locking device, wherein the locking device includes a self-locking component and an unlocking drive component; the self-locking component includes a locking rod and a locking seat, the first end of the locking rod is rotatably mounted on one of the telescopic part and the fixed part of the telescopic member, the second end of the locking rod is provided with a locking tongue, the locking seat is provided on the other of the telescopic part and the fixed part, the locking seat is provided with a wedge-shaped guide surface and a locking space in sequence along the direction away from the first end of the locking rod, the wedge-shaped guide surface is used to abut against the locking tongue and raise the locking tongue when the telescopic part is retracted, until the locking tongue slides into the locking space for self-locking; the unlocking drive component is provided on either the telescopic part and the fixed part and is configured to drive the second end of the locking rod to raise until the locking tongue exits the locking space.

[0005] In one embodiment of this utility model, the unlocking drive and the locking seat are both disposed on the other of the telescopic part and the fixed part, and the unlocking drive is located on the side of the locking seat away from the first end of the locking rod. The unlocking drive is configured to abut against the second end of the locking rod or the lower side of the locking tongue and raise the locking tongue to exit the locking space.

[0006] In one embodiment of the present invention, the unlocking drive includes a linear driver. The driving end of the linear driver is capable of telescopic driving, and the driving end has a wedge-shaped raised surface on the side away from the telescopic member. The wedge-shaped raised surface is inclined close to the telescopic member along the extension direction of the driving end. The wedge-shaped raised surface is used to abut against the lower side of the locking tongue when the driving end is extended, and raise the locking tongue to the exit locking space.

[0007] In one embodiment of this utility model, the driving end of the linear actuator is made of a non-metallic component.

[0008] In one embodiment of this utility model, the locking rod is positioned horizontally and lying on the telescopic member when it is located on the side of the wedge-shaped guide surface away from the locking space along the entire length direction. A wedge-shaped sliding surface is provided on the lower side of the locking tongue. Both the wedge-shaped sliding surface and the wedge-shaped guide surface are inclined away from the telescopic member in the direction away from the first end of the locking rod. The inclination angles of the wedge-shaped sliding surface and the wedge-shaped guide surface are set to be the same. The distance between the inclined distal end of the wedge-shaped sliding surface and the telescopic member is set to be greater than the distance between the inclined proximal end of the wedge-shaped guide surface and the telescopic member when the locking rod is horizontally and lying on the ground.

[0009] In one embodiment of the present invention, the self-locking assembly further includes a mounting base and a stop block. The mounting base and the stop block are both disposed on one of the telescopic part and the fixed part. The first end of the locking rod is rotatably mounted on the mounting base by a pin. The stop block is located between the mounting base and the locking base to horizontally support the locking rod on the telescopic member.

[0010] In one embodiment of the present invention, the self-locking assembly further includes a rotation limiting member, which is disposed on at least one of the locking rod and the stop block. The rotation limiting member is used to generate a force that restricts the locking rod from rotating.

[0011] In one embodiment of this utility model, the rotation limiting member is set as an elastic member, and the two ends of the elastic member are respectively connected to the stop block and the locking rod.

[0012] In one embodiment of this utility model, the second end of the locking rod is provided as an external thread section, and the position of the locking tongue can be adjusted and fitted onto the external thread section.

[0013] In one embodiment of the present invention, the locking seat includes a base plate, a locking main plate and two limiting side plates. The base plate is disposed on the other of the telescopic part and the fixed part. The locking main plate is erected on the end of the base plate facing the first end of the locking rod, and a wedge-shaped guide surface is formed on the end of the locking main plate away from the base plate. The two limiting side plates are respectively disposed on the two ends of the base plate that are opposite to the locking main plate. The two limiting side plates extend out of the wedge-shaped guide surface and surround the locking main plate to form a locking space.

[0014] In one embodiment of this utility model, the first end of the locking rod is rotatably mounted on the fixed part, and the locking seat is provided on the telescopic part.

[0015] In one embodiment of the present invention, the locking device further includes a control component, which includes a positioning detection unit disposed on the locking seat and used to detect the positioning of the locking tongue.

[0016] In one embodiment of this utility model, the positioning detection unit is a Hall sensor.

[0017] To achieve the above objectives, a second aspect of this utility model provides a support leg, wherein the support leg includes the locking device described above.

[0018] To achieve the above objectives, a third aspect of this utility model provides an engineering machine, wherein the engineering machine includes outriggers as described above.

[0019] Through the above technical solution, the locking device provided by this utility model has the following beneficial effects: When the outrigger cylinder uses the aforementioned locking device, since it includes a self-locking component and an unlocking drive, when the telescopic part of the outrigger cylinder retracts, the locking tongue on the locking rod moves closer to the locking seat. After the wedge-shaped guide surface on the locking seat abuts against the locking tongue, the locking tongue can be continuously raised until the telescopic part retracts into the locking space to achieve self-locking. This allows the outrigger cylinder to be mechanically locked even if the hydraulic lock fails, thus preventing dangerous accidents caused by the outrigger extending unexpectedly during travel. In addition, before controlling the outrigger to extend, the second end of the locking rod can be raised to the locking tongue by the unlocking drive to make the locking tongue exit the locking space.

[0020] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a structural schematic diagram of a locking device installed on a telescopic member according to an embodiment of the present utility model; Figure 2 yes Figure 1 Enlarged structural diagram at point A; Figure 3 This is a disassembled structural diagram of the locking device and some telescopic components according to an embodiment of the present utility model.

[0022] Explanation of reference numerals in the attached figures: Detailed Implementation

[0023] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0024] The locking device, outriggers, and engineering machinery of this utility model are described below with reference to the accompanying drawings.

[0025] like Figures 1 to 3 As shown, this utility model provides a locking device, wherein the locking device includes: The self-locking assembly includes a locking rod 100 and a locking seat 200. The first end of the locking rod 100 is rotatably mounted on one of the telescopic part 920 and the fixed part 910 of the telescopic member 900. The second end of the locking rod 100 is provided with a locking tongue 300. The locking seat 200 is provided on the other of the telescopic part 920 and the fixed part 910. The locking seat 200 is provided with a wedge-shaped guide surface 221 and a locking space 240 in sequence along the direction away from the first end of the locking rod 100. The wedge-shaped guide surface 221 is used to abut against the locking tongue 300 and raise the locking tongue 300 when the telescopic part 920 is retracted, until the locking tongue 300 slides into the locking space 240 for self-locking. The unlocking drive 400 is provided on either the telescopic part 920 or the fixed part 910 and is configured to drive the second end of the locking rod 100 to rise to the locking tongue 300 and exit the locking space 240.

[0026] When the outrigger cylinder uses the aforementioned locking device, due to the inclusion of a self-locking component and an unlocking drive 400, when the telescopic portion 920 of the outrigger cylinder retracts, the locking tongue 300 on the locking rod 100 moves relatively closer to the locking seat 200. After the wedge-shaped guide surface 221 on the locking seat 200 abuts against the locking tongue 300, the locking tongue 300 can be continuously raised until the telescopic portion 920 retracts to its position, at which point the locking tongue 300 slides into the locking space 240 to achieve self-locking. This allows the outrigger cylinder to be mechanically locked even in the event of hydraulic lock failure, thus preventing dangerous accidents caused by accidental extension of the outrigger during operation. Furthermore, before controlling the outrigger to extend, the unlocking drive 400 can be used to drive the second end of the locking rod 100 to rise to the locking tongue 300, causing the locking tongue 300 to exit the locking space 240. It should be noted that the telescopic component 900 used in the locking device of this utility model includes, but is not limited to, the outrigger cylinder.

[0027] Specifically, the outrigger cylinder can be configured as a telescopic component 900. The outrigger cylinder includes a cylinder body, a piston rod, a rod connecting part, and a cylinder body mounting part. The piston rod extends from one end of the cylinder body. The cylinder body mounting part is connected to the end of the cylinder body away from the piston rod. The rod connecting part is connected to the end of the piston rod extending out of the cylinder body. That is, the cylinder body and the cylinder body mounting part are configured as the fixing part 910 of the telescopic component 900. One of the locking rod 100 and the locking seat 200 is preferably located on the cylinder body. The piston rod and the rod connecting part are configured as the telescopic part 920 of the telescopic component 900. The other of the locking rod 100 and the locking seat 200 is preferably located on the rod connecting part. More specifically, the locking rod 100 can be disposed on the fixed part 910 of the telescopic member 900, and the locking seat 200 can be disposed on the telescopic part 920 of the telescopic member 900. That is, when the telescopic part 920 is retracted, the locking seat 200 is configured to move toward the locking rod 100. Compared with the movable locking rod 100, the fixed locking seat 200 moves with the telescopic part 920, which is more stable. Of course, this utility model is not limited to this, and the installation positions of the locking rod 100 and the locking seat 200 can also be interchanged.

[0028] In one embodiment of the present invention, the unlocking drive 400 and the locking seat 200 are both disposed on the other of the telescopic part 920 and the fixing part 910, preferably on the telescopic part 920, and the unlocking drive 400 is located on the side of the locking seat 200 away from the first end of the locking rod 100. The unlocking drive 400 is configured to abut against the second end of the locking rod 100 or the lower side of the locking tongue 300 and raise the locking tongue 300 to exit the locking space 240. The unlocking drive component 400 is positioned near the second end of the locking rod 100 and is co-located with the locking seat 200 on the other of the telescopic part 920 and the fixed part 910. The unlocking drive component 400 is designed not to be directly connected to the locking rod 100. Instead, it abuts against the second end of the locking rod 100 or the lower side of the latch 300, raising the latch 300 to disengage it from the locking space 240, thus achieving unlocking. This simplifies the entire unlocking structure and control. However, this invention is not limited to this. The unlocking drive component 400 can also drive the first end of the locking rod 100 to rotate, thereby raising the second end of the locking rod 100 and the latch 300. However, to achieve self-locking of the latch 300, the unlocking drive component 400 requires a complex docking structure that can switch between docking with and disengaging from the first end of the locking rod 100.

[0029] In one embodiment of this utility model, the unlocking drive 400 includes a linear actuator. The drive end of the linear actuator is telescopically oriented, and a wedge-shaped lifting surface 401 is provided on the side of the drive end facing away from the telescopic member 900. The wedge-shaped lifting surface 401 is inclined close to the telescopic member 900 along the extension direction of the drive end. The wedge-shaped lifting surface 401 is used to abut against the lower side of the latch 300 when the drive end is extended, and to raise the latch 300 to the exit locking space 240. By providing a wedge-shaped lifting surface 401 at the drive end of the linear actuator, the telescopic movement of the drive end can be converted into the raising movement of the latch 300, which is simple in structure and effective in driving. Of course, this utility model is not limited to this. The unlocking drive 400 can also be a rotary motor plus a cam structure. The rotary motor drives the cam to rotate so that the cam can lift the second end of the locking rod 100 or the latch 300.

[0030] In one embodiment of this utility model, the latch 300 is made of metal, and the driving end of the linear actuator is made of non-metal. Making the driving end of the linear actuator a non-metallic component reduces friction with the latch 300. Furthermore, when the subsequent positioning detection unit 800 is configured as a Hall sensor, if the latch 300 slides into the locking space 240, the Hall sensor, positioned opposite the latch 300, generates a high-level signal to confirm that the latch 300 has slid in. If the driving end extends towards the lower side of the latch 300 and raises the latch 300 to exit the locking space 240, the Hall sensor, positioned opposite the driving end, generates a low-level signal to confirm that the latch 300 has exited the locking space 240.

[0031] In one embodiment of this utility model, the locking rod 100 is positioned horizontally and inverted on the telescopic member 900 when the wedge-shaped guide surface 221 is located on the side away from the locking space 240 along the entire length direction. Specifically, when the locking rod 100 is located on the side away from the locking space 240 along the entire length direction, that is, when the locking tongue 300 is in the unlocked state, the locking rod 100 in the unlocked state is positioned horizontally and inverted. On the one hand, this can ensure the stability of the locking rod 100 in the unlocked state, and on the other hand, it can facilitate the relative movement between the locking tongue 300 and the locking seat 200 when the telescopic part 920 retracts. Meanwhile, a wedge-shaped sliding surface 301 is provided on the lower side of the locking tongue 300. Both the wedge-shaped sliding surface 301 and the wedge-shaped guide surface 221 are inclined away from the telescopic member 900 in a direction away from the first end of the locking rod 100, and the inclination angles of the wedge-shaped sliding surface 301 and the wedge-shaped guide surface 221 are set to be the same. The distance between the inclined distal end of the wedge-shaped sliding surface 301 and the telescopic member 900 is set to be greater than the distance between the inclined proximal end of the wedge-shaped guide surface 221 and the telescopic member 900 when the locking rod 100 is horizontally tilted. Through the arrangement of the wedge-shaped sliding surface 301 and the wedge-shaped guide surface 221, the locking tongue 300 can smoothly move upward on the upper side of the wedge-shaped guide surface 221. Furthermore, the inclined distal end refers to the end of the corresponding surface that is furthest from the telescopic member 900, and the inclined proximal end refers to the end of the corresponding surface that is closest to the telescopic member 900. During the retraction of the telescopic part 920, the inclined distal end of the wedge-shaped sliding surface 301 moves first to the inclined proximal end of the wedge-shaped guide surface 221. Since the distance between the inclined distal end of the wedge-shaped sliding surface 301 and the telescopic member 900 is greater than the distance between the inclined proximal end of the wedge-shaped guide surface 221 and the telescopic member 900, the locking main plate 220 where the wedge-shaped guide surface 221 is located will not stop the bolt 300. At the same time, in order to lock the bolt 300, the distance between the inclined distal end of the wedge-shaped guide surface 221 and the telescopic member 900 should be set to be greater than the distance between the inclined proximal end of the wedge-shaped sliding surface 301 and the telescopic member 900. And while the bolt 300 locks the locking space 240, the locking rod 100 should also preferably be set to be horizontally tilted. Of course, this utility model is not limited to this. The lower side of the locking tongue 300 can also be set as an arc surface, and there can be point contact between it and the wedge-shaped guide surface 221.

[0032] In one embodiment of this utility model, the self-locking assembly further includes a mounting base 500 and a stop block 600. Both the mounting base 500 and the stop block 600 are disposed on one of the telescopic portion 920 and the fixed portion 910, preferably on the fixed portion 910. The first end of the locking rod 100 is rotatably mounted on the mounting base 500 via a pin 510. The stop block 600 is located between the mounting base 500 and the locking seat 200 to horizontally support the locking rod 100 on the telescopic member 900. The addition of the mounting base 500 and the pin 510 facilitates the removal of the locking rod 100 from the telescopic member 900. The addition of the stop block 600 ensures that when the locking rod 100 is horizontally tilted, it is spaced apart from the telescopic member 900, and also guarantees the locking depth of the locking tongue 300.

[0033] In one embodiment of this utility model, the self-locking assembly further includes a rotation limiting member, which is disposed on at least one of the locking rod 100 and the stop block 600. The rotation limiting member is used to generate a force that restricts the rotation of the locking rod 100. The addition of the elastic member 700 can limit the rotation of the locking rod 100 to ensure the stability of the locking. Furthermore, although a rotation limiting member is provided, when the wedge-shaped guide surface 221 or the wedge-shaped raised surface 401 contacts the latch 300, the force applied to the latch 300 by the corresponding surface is greater than the force applied to the locking rod 100 by the rotation limiting member, allowing the locking rod 100 to still rotate. Only after the force applied to the locking rod by the corresponding surface is removed can the force applied to the locking rod 100 by the rotation limiting member return the locking rod 100 to its original horizontal position.

[0034] In one embodiment of this utility model, the rotation limiting member is an elastic member 700, with both ends of the elastic member 700 respectively connected to the stop block 600 and the locking rod 100. Specifically, the elastic member 700 can be a spring for easy assembly and disassembly. Specifically, there can be two elastic members 700, located on opposite sides of the locking rod 100, each connected to the locking rod 100 and the stop block 600 on its respective side. Alternatively, the rotation limiting member can be a magnet, with the magnet positioned on one of the locking rod 100 and the stop block 600, and the other being a metal component capable of generating a magnetic attraction force with the magnet.

[0035] In one embodiment of this utility model, the second end of the locking rod 100 is provided as an external threaded section 101, and the position of the locking tongue 300 is adjustablely fitted onto the external threaded section 101, thereby realizing the position adjustment of the locking tongue 300 to match different manufacturing precision requirements. Specifically, the inner hole of the locking tongue 300 can be provided as a threaded hole of the external threaded section 101, that is, the locking tongue 300 is directly threadedly connected to the locking rod 100; the inner hole of the locking tongue 300 can also be provided as a smooth hole, and the locking tongue 300 can only be fitted onto the external threaded section 101 of the locking rod 100. The position of the locking tongue 300 can be locked by providing nut parts at both opposite ends of the locking tongue 300.

[0036] In one embodiment of this utility model, the locking seat 200 includes a base plate 210, a locking main plate 220, and two limiting side plates 230. The base plate 210 is disposed on the other of the telescopic part 920 and the fixed part 910, preferably on the telescopic part 920. The locking main plate 220 is erected on the end of the base plate 210 facing the first end of the locking rod 100, and a wedge-shaped guide surface 221 is formed on the end of the locking main plate 220 away from the base plate 210. The two limiting side plates 230 are respectively disposed on the two ends of the base plate 210 that are opposite to the locking main plate 220. The two limiting side plates 230 extend out of the wedge-shaped guide surface 221 and surround the locking main plate 220 to form a locking space 240. This allows the locking tongue 300 to slide into the locking space 240. In addition to the locking main board 220 restricting the axial movement of the locking tongue 300, the two limiting side plates 230 can also restrict the swing of the locking tongue 300 on both sides of the circumference. The addition of the base plate 210 not only facilitates the setting of the entire locking seat 200 on the telescopic member 900, but also allows the lower side of the drive end of the linear actuator to contact the base plate 210 to ensure the smooth extension and retraction of the drive end.

[0037] In one embodiment of the present invention, the locking device further includes a control component, which includes a position detection unit 800. The position detection unit 800 is disposed on the locking seat 200 and is used to detect the position of the locking tongue 300.

[0038] In addition, the control assembly also includes a control unit, which is connected to the hydraulic lock of the telescopic member 900, the unlocking drive member 400, and the position detection unit 800 by signals, and is configured as follows: When the travel detection determines that the telescopic part 920 has retracted into place and the detection signal that the locking tongue 300 is in place is received, the hydraulic lock is controlled to lock the telescopic part 900. Upon receiving a signal indicating the extension of the telescopic part 920, the unlocking drive 400 is activated, and upon receiving a detection signal indicating the withdrawal of the locking tongue 300, the hydraulic lock is activated to release the locking of the telescopic part 900.

[0039] Therefore, by adding control components, the locking device offers two locking methods: mechanical locking via a self-locking component and hydraulic locking via a hydraulic lock, forming a double layer of safety protection. Simultaneously, the telescopic part 920 is only confirmed to be in its retracted position and the hydraulic lock is only engaged when both the stroke detection and the latch 300 detection are completed. This dual detection ensures reliable retraction; if only one detection is completed, an alarm is triggered. Upon receiving a signal indicating the extension of the telescopic part 920, the unlocking drive 400 is first activated to unlock the latch 300. Only upon receiving a signal from the positioning detection unit 800 indicating the latch 300 has retracted is the hydraulic lock released. The telescopic part 920 is only extended after the hydraulic lock is released, thus preventing accidental operation.

[0040] In one embodiment of this utility model, any one of the limiting side plates 230 in the locking seat 200 has a mounting hole facing the locking space 240. The positioning detection unit 800 can be placed in the mounting hole, and the positioning detection unit 800 is a Hall sensor. When the control unit receives a high-level signal from the Hall sensor, it determines that the bolt 300 is in position, and when it receives a low-level signal from the Hall sensor, it determines that the bolt 300 has exited the locking space 240. Of course, this utility model is not limited to this, and the positioning detection unit 800 can also be other suitable position sensors.

[0041] Compared with existing outrigger locking technology, it has the following advantages: 1. The system primarily uses mechanical locking, with elastic elements tightening the locking tongue to rigidly lock the outrigger cylinders. It does not rely on hydraulic systems and remains effective even in extreme working conditions. 2. Strong anti-interference capability; the mechanical structure is unaffected by hydraulic or electrical faults, and maintenance is simple. 3. Dual-state verification: the positioning detection unit and the outrigger cylinder stroke signal are linked to eliminate false alarms and human error; 4. The entire process is automated. The leg retraction automatically locks the leg, and the extension of the leg is electrically unlocked, requiring no manual intervention and balancing efficiency and safety.

[0042] Furthermore, a method for controlling a leg cylinder is also provided, wherein the method is applied to the locking device described above, the telescopic member 900 is configured as a leg cylinder, and the method includes an extension control method and a retraction control method, the retraction control method including: Upon receiving a retraction signal from the telescopic section 920, the telescopic section 920 of the outrigger cylinder is controlled to retract. When the travel detection determines that the telescopic part 920 has retracted into place and the locking tongue 300 has slid into the locking space 240, the hydraulic lock is controlled to lock the outrigger cylinder. Extension control methods include: Upon receiving a signal indicating the extension of the telescopic part 920, the unlocking drive 400 is activated. When the locking tongue 300 is detected to have exited the locking space 240, the hydraulic lock is controlled to release the locking of the telescopic member 900. The extension part 920 of the control outrigger cylinder extends.

[0043] When using the aforementioned outrigger cylinder control method, when the telescopic part 920 of the outrigger cylinder retracts, the locking tongue 300 on the locking rod 100 moves closer to the locking seat 200. After the wedge-shaped guide surface 221 on the locking seat 200 abuts against the locking tongue 300, the locking tongue 300 can be continuously raised until the telescopic part 920 retracts to its position, at which point the locking tongue 300 slides into the locking space 240 to achieve mechanical self-locking. Only when the stroke detection shows that the outrigger 920 has retracted to its position and the locking tongue 300 has been detected to be in position is the telescopic part 920 confirmed to have retracted to its position, and the hydraulic lock is controlled to lock, thus enabling the locking device to have both mechanical locking of the self-locking component and hydraulic locking. The system employs two locking methods—hydraulic locking and hydraulic locking—to create dual safety protection. Even if the hydraulic lock fails, the outrigger cylinders can still be mechanically locked by the locking device, preventing dangerous accidents caused by accidental extension of the outriggers during operation. Furthermore, upon receiving an extension signal from the telescopic unit 920, the system first controls the unlocking drive unit 400 to unlock the latch 300. Only upon receiving a detection signal from the positioning detection unit 800 indicating that the latch 300 has retracted, does the system control the hydraulic lock to release the lock. The telescopic unit 920 is only extended after the hydraulic lock is released, thus preventing accidental operation.

[0044] Furthermore, this utility model also provides a support leg, wherein the support leg includes the locking device described above. Since the support leg adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. Furthermore, this utility model provides another type of engineering machinery, which includes outriggers as described above. Since the engineering machinery employs all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0045] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A locking device, characterized in that, The locking device includes: The self-locking assembly includes a locking rod (100) and a locking seat (200). The first end of the locking rod (100) is rotatably mounted on one of the telescopic part (920) and the fixed part (910) of the telescopic member (900). The second end of the locking rod (100) is provided with a locking tongue (300). The locking seat (200) is provided on the other of the telescopic part (920) and the fixed part (910). The locking seat (200) is provided with a wedge-shaped guide surface (221) and a locking space (240) in sequence along the direction away from the first end of the locking rod (100). The wedge-shaped guide surface (221) is used to abut against the locking tongue (300) and raise the locking tongue (300) when the telescopic part (920) is retracted, until the locking tongue (300) slides into the locking space (240) for self-locking. An unlocking drive (400) is provided on either the telescopic part (920) or the fixed part (910) and is configured to drive the second end of the locking rod (100) to rise to the latch (300) and exit the locking space (240).

2. The locking device according to claim 1, characterized in that, The unlocking drive (400) and the locking seat (200) are both provided on the other of the telescopic part (920) and the fixing part (910), and the unlocking drive (400) is located on the side of the locking seat (200) away from the first end of the locking rod (100). The unlocking drive (400) is configured to abut against the second end of the locking rod (100) or the lower side of the bolt (300) and raise the bolt (300) to exit the locking space (240).

3. The locking device according to claim 2, characterized in that, The unlocking drive (400) includes a linear driver, the drive end of which is telescopically driven, and the drive end has a wedge-shaped raised surface (401) on the side opposite to the telescopic member (900). The wedge-shaped raised surface (401) is inclined close to the telescopic member (900) along the extension direction of the drive end. The wedge-shaped raised surface (401) is used to abut against the lower side of the latch (300) when the drive end is extended, and to raise the latch (300) to exit the locking space (240).

4. The locking device according to claim 3, characterized in that, The driving end of the linear actuator is made of a non-metallic component.

5. The locking device according to claim 1, characterized in that, The locking bar (100) is positioned horizontally on the telescopic member (900) with the wedge-shaped guide surface (221) facing away from the locking space (240) along its entire length. A wedge-shaped sliding surface (301) is provided on the lower side of the latch (300). Both the wedge-shaped sliding surface (301) and the wedge-shaped guide surface (221) are inclined away from the telescopic member (900) along the direction away from the first end of the locking bar (100). The inclination angles of the wedge-shaped sliding surface (301) and the wedge-shaped guide surface (221) are set to be the same. The distance between the inclined distal end of the wedge-shaped sliding surface (301) and the telescopic member (900) is set to be greater than the distance between the inclined proximal end of the wedge-shaped guide surface (221) and the telescopic member (900) when the locking bar (100) is horizontally positioned.

6. The locking device according to claim 1, characterized in that, The self-locking assembly further includes a mounting base (500) and a stop (600), both of which are disposed on one of the telescopic part (920) and the fixed part (910). The first end of the locking rod (100) is rotatably mounted on the mounting base (500) via a pin (510). The stop (600) is located between the mounting base (500) and the locking seat (200) to horizontally support the locking rod (100) on the telescopic member (900).

7. The locking device according to claim 6, characterized in that, The self-locking assembly further includes a rotation limiting member, which is disposed on at least one of the locking rod (100) and the stop (600). The rotation limiting member is used to generate a force that restricts the rotation of the locking rod (100). The rotation limiting member is configured as an elastic member (700), and the two ends of the elastic member (700) are respectively connected to the stop (600) and the locking rod (100).

8. The locking device according to any one of claims 1 to 7, characterized in that, The second end of the locking rod (100) is provided as an external thread section (101), and the position of the locking tongue (300) is adjustablely fitted onto the external thread section (101); And / or, the locking seat (200) includes a base plate (210), a locking main plate (220), and two limiting side plates (230). The base plate (210) is disposed on the other of the telescopic part (920) and the fixed part (910). The locking main plate (220) is erected at one end of the base plate (210) facing the first end of the locking rod (100), and the wedge-shaped guide surface (221) is formed at the end of the locking main plate (220) away from the base plate (210). The two limiting side plates (230) are respectively disposed at the two ends of the base plate (210) that are opposite to each other and spaced apart from the locking main plate (220). The two limiting side plates (230) extend out of the wedge-shaped guide surface (221) and surround the locking main plate (220) to form the locking space (240). And / or, the first end of the locking rod (100) is rotatably mounted on the fixed part (910), and the locking seat (200) is provided on the telescopic part (920); And / or, the locking device further includes a control component, the control component including a position detection unit (800), the position detection unit (800) being disposed on the locking seat (200) and used to detect the position of the locking tongue (300).

9. A support leg, characterized in that, The outrigger includes a locking device according to any one of claims 1 to 8.

10. An engineering machinery, characterized in that, The construction machinery includes outriggers as described in claim 9.

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