CN201777803U - Disassembly and assembly device for leg pin shafts of wheeled engineering machinery - Google Patents

Abstract

The utility model discloses a disassembling device for a pin shaft of a support leg of a wheeled construction machine. The pin shaft of the support leg is used to realize the hinge connection between the support leg and the vehicle frame. Correspondingly arranged oil cylinder and hydraulic control circuit; wherein, the cylinder rod extension end of the oil cylinder is coaxially fixedly connected with the pin shaft of the outrigger; the control oil circuit of the hydraulic control circuit communicates with the chamber of the oil cylinder respectively . Compared with the existing technology, it has the characteristics of simple operation and labor saving, which greatly improves the work efficiency; especially for the bolt operation, even if the centers of the two structural parts cannot be aligned accurately, the pin shaft can be reliably aligned by hydraulic pressure. sell in. On this basis, the utility model also provides a wheeled construction machine with the device for disassembling and disassembling the pin shaft of the outrigger.

Description

Assembly and disassembly device for wheeled construction machinery and its outrigger pins

technical field

The utility model relates to the technical field of construction machinery, in particular to a disassembly and assembly device for a wheeled construction machinery and its outrigger pin shafts.

Background technique

Wheeled cranes are widely used in various construction operations due to their convenient transfer characteristics. For wheeled cranes, the outriggers realize the basic function of supporting the frame by connecting with the frame.

At present, the outrigger types of existing cranes are mainly divided into two types: one is H-type, when the crane is lifting, the outriggers at the front and rear ends of the frame protrude to both sides respectively, and it is H-shaped when viewed from above. One is X-type, when the crane is in operation, the outriggers on both sides of the frame are respectively placed to the two sides, and it is X-shaped when viewed from above.

Please refer to FIG. 1 , which shows a top view of the existing X-shaped outriggers.

As shown in the figure, the front outrigger 3 is inserted in the front outrigger 2, the rear outrigger 5 is inserted in the rear outrigger 4, and the assembled front and rear outrigger assemblies pass through the upper pin shaft 6 and the lower pin shaft respectively. The shaft 7 is connected with the vehicle frame 1, and the connected outrigger assembly can rotate around the vehicle frame 1, please refer to Fig. 2 and Fig. 3 for details. During the transition operation, large structural parts such as outriggers need to be removed from the frame to facilitate agile and fast driving on the road. The pin shaft connection between the existing X-shaped outrigger and the frame is mostly a clearance fit. When assembling the pin shaft, first align the holes of the two parts, and then insert the pin shaft and hit it hard until it is assembled in place. Finally, it is fixed by an external baffle; when disassembling the pin shaft, you can hit the pin shaft from one side, or use a disassembly tool to cooperate with the process threaded hole on the pin shaft to pull it out. That is to say, most of the existing pin connection methods are done manually, which is time-consuming, laborious and has potential safety hazards.

In view of this, it is urgent to optimize the design for the prior art, so as to improve the working reliability of the plug and pin removal.

Utility model content

In view of the above-mentioned defects, the technical problem to be solved by the utility model is to provide a dismounting device for the outrigger pin shaft of wheeled construction machinery, so as to abandon the time-consuming, laborious and safe and reliable operation of the prior art when inserting and pulling out the pins. Sexual flaws. On this basis, the utility model also provides a wheeled construction machine with the device for disassembling and disassembling the pin shaft of the outrigger.

The utility model provides a dismantling device for the outrigger pin shaft of a wheeled engineering machinery, the outrigger pin shaft is used to realize the hinge connection between the outrigger and the vehicle frame, and the disassembly device includes a device corresponding to the outrigger pin shaft An oil cylinder and a hydraulic control circuit are provided; wherein, the extension end of the cylinder rod of the oil cylinder is coaxially fixedly connected with the pin shaft of the outrigger; the control oil circuits of the hydraulic control circuit communicate with the chambers of the oil cylinder respectively.

Preferably, the hydraulic control circuit specifically includes a hydraulic pump and a directional control valve; wherein, the hydraulic pump pumps the oil in the oil tank to the system pressure oil circuit; the oil inlet of the directional control valve is connected to the system pressure oil circuit Its oil return port is connected with the system pressure oil circuit, and its two control oil ports are respectively connected with the two chambers of the oil cylinder; and the directional control valve has three working positions: in the first working position, its The oil inlet is connected to the first control oil port, and its oil return port is connected to the second control oil port; in the second working position, the oil ports are non-conductive; in the third working position, the oil inlet The port is connected to the second control oil port, and its oil return port is connected to the first control oil port.

Preferably, the directional control valve further includes: a central oil inlet port communicated with the system pressure oil circuit and a central oil drain port communicated with the system oil return circuit; and in the first working position and the third working position, The middle oil inlet and the middle oil drain are non-conductive, and in the second working position, the middle oil inlet and the middle oil drain are connected.

Preferably, the pins of the legs are specifically: front upper right pin, front lower right pin, front left upper pin, front left lower pin, rear upper right pin, rear right lower pin, rear upper left pin and rear The lower left pin shaft; the oil cylinder is specifically: the front right upper plug pin oil cylinder, the front right lower plug pin oil cylinder, the front left upper plug pin oil cylinder, the front left lower plug pin oil cylinder, the rear right upper plug pin oil cylinder, and the rear right lower plug pin oil cylinder. pin pulling oil cylinder, rear upper left plugging pin oil cylinder and rear left lower plugging pin oil cylinder; the directional control valves are specifically eight and are respectively set corresponding to each plugging pin oil cylinder; the control oil port of each directional control valve is respectively connected to The rod chamber and the rodless chamber of the corresponding plug pin oil cylinder are in communication.

Preferably, the directional control valves corresponding to the front upper right pin cylinder, the front lower right pin cylinder, the rear upper right pin cylinder and the rear lower right pin cylinder are integrated into a first directional control valve group. The corresponding directional control valves of the front left upper pin cylinder, front left lower pin cylinder, rear left upper pin cylinder and rear left lower pin cylinder are integrated into a second directional control valve group.

Preferably, the first directional control valve group and the second directional control valve group are respectively provided with overflow valves on the oil inlet circuits.

Preferably, at the hinge joint between the outrigger and the frame, the outrigger has a first box-shaped structure, the frame has a second box-shaped structure, and the second box-shaped structure of the vehicle frame is located on the Above the first box-shaped structure of the outrigger; the front right upper plug pin oil cylinder, the front left upper plug pin oil cylinder, the rear right upper plug pin oil cylinder and the rear left upper plug pin oil cylinder are respectively located in the corresponding second box-shaped structure , and the corresponding pin shaft is hinged with the upper top plate of the leg after extending through the upper cover plate of the second box-shaped structure; the front right lower plug pin oil cylinder, the front left lower plug pin oil cylinder, the rear right The lower plug-in pin oil cylinder and the rear left lower plug-in pin oil cylinder are respectively located in the corresponding first box-shaped structure, and the corresponding pin shafts protrude from the first lower cover plate of the first box-shaped structure and connect with the vehicle frame. The lower bottom plate is hinged.

Preferably, the first box-shaped structure of the support leg further has a second lower cover plate located below the first lower cover plate, and the lower bottom plate of the vehicle frame is inserted into the first lower cover plate and the second lower cover plate. between the two lower cover plates, and the corresponding pins extend through the first lower cover plate of the first box-shaped structure and the lower bottom plate of the vehicle frame, and connect with the second lower cover of the first box-shaped structure Plate hinged.

The wheeled engineering machinery provided by the utility model includes a vehicle frame and a support leg hinged with the vehicle frame, and also includes a disassembling device for the support leg of the wheeled construction machine as mentioned above.

Preferably, the wheeled construction machinery is specifically a wheeled crane.

The disassembly and assembly device for the outrigger pins of wheeled engineering machinery provided by the utility model adopts hydraulic transmission technology to realize the installation and disassembly of the outrigger pins, and is fixedly connected with the corresponding outrigger pins through hydraulic oil cylinders as executive components, and drives The outrigger pin shaft is stretched out or retracted; during the operation process, the device works smoothly and responds quickly, and the manipulation control is convenient to realize the action of inserting and pulling out the pin. Compared with the existing technology, it has the characteristics of simple operation and labor saving, which greatly improves the work efficiency; especially for the bolt operation, even if the centers of the two structural parts cannot be aligned accurately, the pin shaft can be reliably aligned by hydraulic pressure. sell into.

The oil cylinders in the preferred scheme of the utility model are specifically: the front right upper plug pin oil cylinder, the front right lower plug pin oil cylinder, the front left upper plug pin oil cylinder, the front left lower plug pin oil cylinder, the rear right upper plug pin oil cylinder, and the rear right lower Insertion pin oil cylinder, rear upper left inserting pin oil cylinder and rear left lower inserting pin oil cylinder; there are eight directional control valves and they are respectively set corresponding to each inserting pin oil cylinder; in order to reliably realize simultaneous action or synchronous action of each pin shaft .

In another preferred solution of the present utility model, the four directional control valves used in cooperation with the left outrigger are integrated into a first directional control valve group, and the four directional control valves used in cooperation with the right outrigger are integrated into a second directional control valve group. Directional control valve group; it can be arranged in a position that is easy for people to manipulate according to needs, so as to facilitate the arrangement of system piping components. Specifically, overflow valves are respectively set on the inlet oil circuits of the two directional control valve groups; in this way, when the external resistance is too large and it is difficult to insert into the hole, the system pressure oil can be safely overflowed through the aforementioned overflow valves , to ensure the working stability of the device.

The utility model provides a dismounting device for a pin shaft of a wheeled construction machine leg, which is particularly suitable for a wheeled crane.

Description of drawings

Fig. 1 is the top view of existing X-shaped support leg stretched out;

Fig. 2 is a partial view of the connection between the existing X-shaped leg and the vehicle frame;

Fig. 3 is the A direction view of Fig. 2;

Fig. 4 is a schematic diagram of the overall structure of the wheeled crane described in the specific embodiment;

Fig. 5 is a side partial view of the assembling relationship between the legs and the frame in the specific embodiment;

Fig. 6 shows an axonometric view of the X-shaped leg in the specific embodiment when it is in an open state;

Fig. 7 is a top view of the vehicle frame after each leg is removed in the specific embodiment;

Fig. 8 shows a diagram illustrating the working principle of the hydraulic control circuit.

In Figure 4 to Figure 8:

Bracket 10, second box-shaped structure 11, upper cover plate 111, lower bottom plate 12, front left outrigger 21, first box-shaped structure 211, first lower cover plate 2111, upper top plate 212, front right outrigger 22, rear Left outrigger 31, rear right outrigger 32, front left upper plug pin 41, front left lower plug pin 42, front left upper plug pin oil cylinder 51, front left lower plug pin oil cylinder 52, front right upper plug pin oil cylinder 53, front Right lower plug pin oil cylinder 54, rear upper left plug pin oil cylinder 55, rear left lower plug pin oil cylinder 56, rear upper right plug pin oil cylinder 57, rear right lower plug pin oil cylinder 58, hydraulic pump 81, oil tank 82, oil suction filter Oil tank 83, oil return oil filter 84, air filter 85, one-way valve 86, direction control valve 87, overflow valve 88, quick connector 89.

Detailed ways

The core of the utility model is to provide a dismantling device for the outrigger pin shaft of wheeled construction machinery. The dismantling device adopts hydraulic transmission technology and realizes the plugging and pulling operation of the pin shaft through the oil cylinder, and has the characteristics of simple operation and high work efficiency. . The present embodiment will be described in detail below in conjunction with the accompanying drawings.

Without loss of generality, this paper takes a wheeled crane as an example to describe in detail. It should be noted that the orientation words involved in this article, such as up, down, left, right, front, and rear, are defined based on the driver's perspective when driving. It should be understood that the use of the above-mentioned orientation words should not limit this article. The scope of protection sought by the application.

Please refer to FIG. 4 , which is a schematic diagram of the overall structure of the wheeled crane described in this embodiment.

The main functional components of the wheeled crane, such as the chassis system, the boom system, the winch system, the power system, and the control system, are the same as those of the prior art, and those skilled in the art can fully realize them based on the prior art, so this article will not repeat them. Compared with the prior art, the main difference of this solution lies in the optimized design for the insertion and extraction operation of the outrigger pin shaft, that is, the dismounting device for the outrigger pin shaft. Please also refer to FIG. 5 , which shows a side partial view of the outrigger and the vehicle frame.

The assembly and disassembly device of the pin shaft of the outrigger includes: an oil cylinder and a hydraulic control circuit; wherein, the control oil passages of the hydraulic control circuit are connected with the chambers of the oil cylinder respectively, so as to realize the extension or retraction operation of the control oil cylinder, that is to say, to establish The working connection relationship between the system pressure oil circuit and the oil return circuit; the oil cylinder and the pin shaft of the outrigger are set correspondingly, and the extension end of the cylinder rod is fixedly connected with the pin shaft of the outrigger, and the hydraulic cylinder is used as the actuator to drive the outrigger The pin shaft completes the operation of plugging or pulling out the pin.

In fact, for one outrigger, one outrigger pin can be used to hinge with the frame, or two outrigger pins can be used to realize the hinge with the frame; The outrigger pin is beneficial to the design of the structural parts and can effectively ensure the reliability of the work, which is the optimal solution. It should be understood that as long as the basic idea of the present utility model is adopted to realize the operation of inserting and pulling out the pin through the oil cylinder, it is within the protection scope of the present application.

Please also refer to FIG. 6 , which shows an axonometric view of the X-shaped leg in an open state.

As shown in the figure, the basic design of the joints between the front left leg 21, the front right leg 22, the rear left leg 31 and the rear right leg 32 and the bracket 10 is the same, that is, a symmetrical structure. Therefore, only the connection structure between the front left outrigger 21 and the bracket 10 and the arrangement of the corresponding outrigger pins and oil cylinders will be described in detail herein.

Combining Figure 5 and Figure 6. At the joint between the front left outrigger 21 and the vehicle frame 10, the front left outrigger 21 has a first box-shaped structure 211, the vehicle frame 10 has a second box-shaped structure 11, and the second box-shaped structure 11 of the vehicle frame 20 is located at the front Above the first box-shaped structure 211 of the left leg 21; the front left upper plug-in pin oil cylinder 51 is respectively located in the second box-shaped structure 11, and the front left upper plug-in pin 41 passes through the upper cover plate 111 of the second box-shaped structure 11 After stretching out, it is hinged with the upper top plate 212 of the front left leg 21; the front left lower plug pin oil cylinder 52 is located in the corresponding first box structure 211, and the front left lower plug pin 42 passes through the first box structure 211. The lower cover plate 2111 is hinged with the lower bottom plate 12 of the vehicle frame 10 after stretching out.

In order to further improve the reliability of the connection between the bracket and the legs, the first box-shaped structure 211 of the front left leg 21 also has a second lower cover 2112 located below the first lower cover 2111, and the lower bottom plate 12 of the vehicle frame 10 is plugged into it. Installed between the first lower cover plate 2111 and the second lower cover plate 2112, and the front left lower plug pin 42 protrudes through the first lower cover plate 2111 of the first box-shaped structure 211 and the lower bottom plate 12 of the vehicle frame 10 Then it is hinged with the second lower cover plate 2112 of the first box structure 211.

As mentioned above, the basic design of the joints between the front left leg 21 , the front right leg 22 , the rear left leg 31 and the rear right leg 32 and the bracket 10 is the same. Therefore, for the front upper right pin shaft, front right lower pin shaft, rear right upper pin shaft, rear right lower pin shaft, rear left upper pin shaft and rear left lower pin shaft; The specific connection relationship between the rear right upper plug pin oil cylinder, the rear right lower plug pin oil cylinder, the rear left upper plug pin oil cylinder and the rear left lower plug pin oil cylinder and the vehicle frame 10 and the corresponding legs will not be described in detail. Please also refer to FIG. 7 , which shows a top view of the vehicle frame after each outrigger is removed.

Please refer to Fig. 8, which shows the working principle diagram of the hydraulic control circuit.

The hydraulic pump 81 pumps the oil in the oil tank 82 to the system pressure oil circuit, and the hydraulic pump 81 can be plugged into an independent power take-off port of the gearbox and driven to work by the gearbox.

An oil suction filter 83, an oil return filter 84 and an air filter 85 are installed in the oil tank 82, wherein the oil suction filter 83 is arranged on the liquid inlet oil circuit of the hydraulic pump 81, and the oil in the oil return oil circuit passes through Return oil filter 84 flows back to oil tank 82 .

The liquid outlet of the hydraulic pump 81 communicates with each directional control valve 87 through a one-way valve 86 . Specifically, the oil inlet P of each directional control valve 87 is connected with the system pressure oil circuit, its oil return port T is connected with the system pressure oil circuit, and its two control oil ports A and B are respectively connected with the two chambers of the corresponding oil cylinder. The chamber is connected; and the directional control valve has three working positions: in the first working position, its oil inlet P is connected to the first control oil port A, and its oil return port T is connected to the second control oil port B; In the second working position, the oil ports are non-conductive; in the third working position, the oil inlet P is connected to the second control oil port B, and the oil return port T is connected to the first control oil port A .

Preferably, the directional control valve 87 also includes: a central oil inlet port C communicated with the system pressure oil circuit and a central oil drain port D communicated with the system oil return circuit; and in the first working position and the third working position , there is non-conduction between the middle oil inlet C and the middle oil drain D, and in the second working position, there is conduction between the middle oil inlet C and the middle oil drain D. It is designed in this way to improve the reliability of the system work.

With the front left upper plug pin oil cylinder 51, the front left lower plug pin oil cylinder 52, the front right upper plug pin oil cylinder 53, the front right lower plug pin oil cylinder 54, the rear left upper plug pin oil cylinder 55, the rear left lower plug pin oil cylinder 56, Correspondingly, there are eight directional control valves 87 corresponding to the rear right upper plug pin oil cylinder 57 and the rear right lower plug pin oil cylinder 58. Preferably, the directional control valves corresponding to the front upper right pin cylinder 53 , the front lower right pin cylinder 54 , the rear upper right pin cylinder 57 and the rear right lower pin cylinder 58 are integrated into a first directional control valve group , the direction control valve 87 corresponding to the front left upper pin cylinder 51, the front left lower pin cylinder 52, the rear upper left pin cylinder 55 and the rear left lower pin cylinder 56 is integrated into a second direction control valve group, the first The direction control valve group and the second direction control valve group are arranged on both sides of the vehicle frame 10 . Moreover, overflow valves 88 are respectively collected on the oil inlet circuits of the first directional control valve group and the second directional control valve group.

During the working process, the operator presses the power take-off switch button arranged in the cab, and the hydraulic pump 81 starts to work. The pressurized oil pumped out by the hydraulic pump 81 is respectively connected to the directional control valve valve groups located on both sides of the vehicle frame 10 through the check valve 86, and communicated with the oil inlet P of each directional control valve 87 respectively. The extension or retraction of the corresponding oil cylinder can be realized through the reversing of the directional control valve 87 . Take the directional control valve 87 connected to the front upper left plug pin oil cylinder 51 as an example to briefly describe its control process: when the handle is moved upwards, the directional control valve switches to the upper position (the first working position), and the pressure oil enters through port B The small cavity of the front upper left bolt cylinder 51 realizes the pin pulling action of the cylinder at this time; when the handle is moved downward, the directional control valve switches to the lower position (the third working position), and the pressure oil enters the front upper left through port A The large cavity of bolt oil cylinder 51 has realized the bolt action of this cylinder now. And in the second working position (neutral position), the oil cylinder is in a non-working state. It should be noted that each directional control valve 87 can control the corresponding oil cylinder respectively, and can act separately or simultaneously.

And when the external resistance is too large and difficult to be inserted into the hole, the pressure oil will be safely overflowed through the overflow valve 88 integrated on the directional control valve group. In addition, since each lower pin oil cylinder is installed inside the support leg, this solution is provided with a quick joint 89 in the connecting pipeline to facilitate the connection of the hydraulic pipeline.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (10)

1. A disassembly and assembly device for the outrigger pin of wheeled engineering machinery, the outrigger pin is used to realize the hinge connection between the outrigger and the vehicle frame, and it is characterized in that it includes: an oil cylinder corresponding to the pin shaft of the outrigger, the extension end of the cylinder rod of the oil cylinder is fixedly connected coaxially with the pin shaft of the outrigger; and A hydraulic control circuit, the control oil passages of which are respectively communicated with the chambers of the oil cylinders. 2. The assembly and disassembly device for the outrigger pin of wheeled engineering machinery according to claim 1, wherein the hydraulic control circuit specifically includes: A hydraulic pump that pumps the oil in the oil tank to the system pressure oil circuit; and A directional control valve, the oil inlet of which is connected to the system pressure oil circuit, the oil return port is connected to the system pressure oil circuit, and the two control oil ports are respectively connected to the two chambers of the oil cylinder; and The directional control valve has three working positions: in the first working position, its oil inlet is connected to the first control oil port, and its oil return port is connected to the second control oil port; in the second working position, its The oil ports are non-conductive; in the third working position, the oil inlet port is connected to the second control oil port, and the oil return port is connected to the first control oil port. 3. The assembly and disassembly device for the outrigger pin of wheeled construction machinery according to claim 2, wherein the directional control valve further comprises: The center oil inlet port communicates with the system pressure oil circuit; and The middle oil drain port is connected with the oil return line of the system; and In the first working position and the third working position, there is no conduction between the middle oil inlet port and the middle oil drain port; in the second working position, the middle oil inlet port and the middle oil drain port conduction between. 4. The dismounting device for outrigger pins of wheeled engineering machinery according to claim 2 or 3, characterized in that the outrigger pins are specifically: front upper right pin, front lower right pin, front upper left Pin shaft, front left lower pin shaft, rear right upper pin shaft, rear right lower pin shaft, rear left upper pin shaft and rear left lower pin shaft; the oil cylinders are specifically: front right upper plug pin oil cylinder, front right lower plug pin oil cylinder, Front left upper plug pin oil cylinder, front left lower plug pin oil cylinder, rear right upper plug pin oil cylinder, rear right lower plug pin oil cylinder, rear upper left plug pin oil cylinder and rear left lower plug pin oil cylinder; the directional control valve is specifically There are eight of them corresponding to each plug pin oil cylinder; the control oil port of each directional control valve communicates with the rod chamber and the rodless chamber of the corresponding plug pin oil cylinder respectively. 5. The dismounting device for the outrigger pin of wheeled construction machinery according to claim 4, characterized in that it is connected with the front upper right plug pin oil cylinder, the front right lower plug pin oil cylinder, and the rear right upper plug pin oil cylinder The directional control valve corresponding to the rear right lower pin cylinder is integrated into the first directional control valve group, which is connected with the front upper left pin cylinder, the front left lower pin cylinder, the rear upper left pin cylinder and the rear left lower pin cylinder. The corresponding directional control valves of the pin cylinders are integrated into the second directional control valve group. 6. The assembly and disassembly device for the outrigger pin of wheeled construction machinery according to claim 5, characterized in that, the oil inlets of the first directional control valve group and the second directional control valve group are respectively collected with overflow flow valve. 7. The assembly and disassembly device for the legs of wheeled construction machinery according to claim 1 or 2, characterized in that, at the hinge joint between the legs and the vehicle frame, the legs have a first box-shaped structure, so that The vehicle frame has a second box-shaped structure, and the second box-shaped structure of the vehicle frame is located above the first box-shaped structure of the legs; the front right upper plug pin oil cylinder, the front left upper plug pin oil cylinder, The rear right upper plug-in pin oil cylinder and the rear left upper plug-in pin oil cylinder are respectively located in the corresponding second box-shaped structure, and the corresponding pin shafts are stretched out through the upper cover plate of the second box-shaped structure and are connected with the legs of the legs. The upper top plate is hinged; the front right lower plug pin oil cylinder, the front left lower plug pin oil cylinder, the rear right lower plug pin oil cylinder and the rear left lower plug pin oil cylinder are respectively located in the corresponding first box-shaped structure, and the corresponding pins The shaft protrudes through the first lower cover plate of the first box-shaped structure and is hinged with the lower bottom plate of the vehicle frame. 8. The assembly and disassembly device for the outriggers of wheeled construction machinery according to claim 7, wherein the first box-shaped structure of the outriggers also has a second lower cover located below the first lower cover plate plate, the lower bottom plate of the vehicle frame is inserted between the first lower cover plate and the second lower cover plate, and the corresponding pin shaft passes through the first lower cover plate of the first box-shaped structure, the The lower bottom plate of the vehicle frame is hinged with the second lower cover plate of the first box-shaped structure after stretching out. 9. Wheeled construction machinery, comprising a vehicle frame and a support leg hinged to the vehicle frame; it is characterized in that it also includes a disassembly device for a wheeled construction machinery support leg according to any one of claims 1 to 8 . 10. The wheeled construction machine according to claim 9, characterized in that, the wheeled construction machine is specifically a wheeled crane.

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