Landing leg structure and loader-digger

Abstract

The utility model relates to the technical field of engineering machines, in particular to a supporting leg structure and a backhoe loader. The supporting leg structure comprises a cylinder barrel, a piston rod, a first air bag, a second air bag and an air pressure assembly. The cylinder barrel is used for being connected with a vehicle body. A first air bag and a second air bag are arranged on the two sides of the piston rod respectively. The air pressure assembly controls the first airbag to inflate and the second airbag to exhaust so as to drive the piston rod to move away from the cylinder barrel. The air pressure assembly controls the second airbag to inflate and the first airbag to exhaust so as to drive the piston rod to move towards the cylinder barrel. According to the supporting leg structure and the backhoe loader, the supporting leg structure can bear acting force in the horizontal direction, the problems of sealing ring damage and hydraulic oil leakage are solved, and the reliability of the supporting leg structure is improved.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, and in particular to a leg structure and an excavator loader. Background Technology

[0002] When an excavator loader is performing excavation operations, it needs to use outriggers to support the vehicle body so that the tires are off the support surface, thus avoiding damage to the tires during the excavation process.

[0003] In existing technology, an outrigger includes a cylinder and a piston housed within the cylinder. The piston divides the cylinder interior into two chambers for injecting hydraulic oil. To prevent hydraulic oil leakage, sealing rings are typically installed at the piston and the end caps of the cylinder. By controlling the flow rate of hydraulic oil entering the different chambers, the piston can be moved, thereby changing the length of the outrigger.

[0004] However, during excavation operations, the outriggers may be subjected to horizontal forces, which can damage the seals, cause hydraulic oil leaks, and result in poor reliability. Utility Model Content

[0005] This application provides an outrigger structure and an excavator loader. The outrigger structure can withstand horizontal forces, solves the problems of seal damage and hydraulic oil leakage, and improves the reliability of the outrigger structure.

[0006] In the first aspect, the outrigger structure provided in this application includes: a cylinder, a piston rod, a first airbag, a second airbag, and a pneumatic assembly, wherein the cylinder is used to connect to the vehicle body.

[0007] Part of the piston rod is inserted into the cylinder, and a first airbag and a second airbag are respectively installed on both sides of the piston rod.

[0008] A pneumatic assembly, connected to a first airbag and a second airbag, is configured to control the inflation of the first airbag and the deflation of the second airbag to drive the piston rod away from the cylinder; the pneumatic assembly is also configured to control the inflation of the second airbag and the deflation of the first airbag to drive the piston rod toward the cylinder.

[0009] In one possible implementation, the outrigger structure provided in this application has a corrugated sidewall for the first airbag and a spiral-shaped second airbag.

[0010] In one possible implementation, the outrigger structure provided in this application includes a pneumatic assembly comprising: a control valve, an air inlet pipe, and an air outlet pipe; the control valve is connected to the first airbag and the second airbag respectively; the air inlet pipe is connected to the control valve and an air source; and the air outlet pipe is connected to the control valve.

[0011] The control valve is configured to control the intake pipe to communicate with the first airbag and the exhaust pipe to communicate with the second airbag, so as to inflate the first airbag and deflate the second airbag; the control valve is also configured to control the intake pipe to communicate with the second airbag and the exhaust pipe to communicate with the first airbag, so as to inflate the second airbag and deflate the first airbag.

[0012] In one possible implementation, the outrigger structure and pneumatic assembly provided in this application further include: two connecting pipes, wherein the first airbag and the second airbag are respectively connected to a control valve through the connecting pipes.

[0013] In one possible implementation, the outrigger structure provided in this application further includes a protective sleeve, and the end of the cylinder is provided with a constricted end, which is located on the side of the second airbag away from the first airbag. The protective sleeve is fitted onto the piston rod, and the protective sleeve abuts against the inner wall of the constricted end.

[0014] In one possible implementation, the leg structure provided in this application has at least one first support portion on the constricted end, and the first support portion is arranged along the extension direction of the constricted end.

[0015] In one possible implementation, the outrigger structure provided in this application has a limiting part on the piston rod, and the first support part abuts or disengages from the limiting part.

[0016] In one possible implementation, the outrigger structure provided in this application has a limiting member inside the cylinder, which abuts against the piston rod to confine part of the piston rod inside the cylinder.

[0017] In one possible implementation, the outrigger structure provided in this application has a second support portion on the piston rod, which is used to contact the support surface.

[0018] Secondly, this application also provides an excavator loader, including an excavator loader body and any of the outrigger structures provided in the first aspect described above disposed on the excavator loader body.

[0019] The outrigger structure and excavator loader provided in this application include an outrigger structure comprising a cylinder, piston rod, a first airbag, a second airbag, and a pneumatic assembly. The cylinder is used to connect to the vehicle body. Part of the piston rod is inserted into the cylinder, with the first and second airbags respectively located on either side of the piston rod. The pneumatic assembly communicates with the first and second airbags. When the pneumatic assembly controls the inflation of the first airbag and the deflation of the second airbag, it can drive the piston rod away from the cylinder, causing part of the piston rod to extend out of the cylinder, thereby increasing the length of the outrigger structure. When the pneumatic assembly controls the inflation of the second airbag and the deflation of the first airbag, it can drive the piston rod towards the cylinder, causing part of the piston rod to retract into the cylinder, thereby reducing the length of the outrigger structure. In this way, the outrigger structure provides reliable support for the vehicle body, can withstand horizontal forces, solves the problems of seal damage and hydraulic oil leakage, and improves the reliability of the outrigger structure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the support leg structure provided in the embodiments of this application;

[0022] Figure 2 for Figure 1 Enlarged structural diagram of section A;

[0023] Figure 3 for Figure 1 Enlarged structural diagram of section B;

[0024] Figure 4 This is a structural schematic diagram of an excavator loader provided in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100 - Cylinder barrel; 110 - Closing end; 120 - First support part; 130 - Limiting component;

[0027] 200 - Piston rod; 210 - Piston; 220 - Limiting part; 230 - Second support part;

[0028] 300 - First airbag;

[0029] 400 - Second airbag;

[0030] 500 - Pneumatic assembly; 510 - Control valve; 520 - Inlet pipe fitting; 530 - Outlet pipe fitting; 540 - Connecting pipe fitting; 550 - Valve;

[0031] 600 - Protective Cover.

[0032] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0033] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0034] Secondly, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Furthermore, it should be noted that in the description of this application, the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0037] As illustrated in the background section, in the prior art, an outrigger includes a cylinder and a piston disposed within the cylinder. The piston divides the interior of the cylinder into two chambers for injecting hydraulic oil. To prevent hydraulic oil leakage, sealing rings are typically installed at the piston and the end caps of the cylinder. By controlling the flow rate of hydraulic oil entering the different chambers, the piston can be moved, thereby changing the length of the outrigger.

[0038] However, during excavation operations, the outriggers may be subjected to horizontal forces, which can damage the seals, cause hydraulic oil leaks, and result in poor reliability.

[0039] Based on this, the outrigger structure and excavator loader provided in this application include an outrigger structure comprising a cylinder, piston rod, a first airbag, a second airbag, and a pneumatic assembly. The cylinder is used to connect to the vehicle body. Part of the piston rod is inserted into the cylinder, with the first and second airbags respectively located on either side of the piston rod. The pneumatic assembly communicates with the first and second airbags. When the pneumatic assembly controls the inflation of the first airbag and the deflation of the second airbag, it can drive the piston rod away from the cylinder, causing part of the piston rod to extend out of the cylinder, thereby increasing the length of the outrigger structure. When the pneumatic assembly controls the inflation of the second airbag and the deflation of the first airbag, it can drive the piston rod towards the cylinder, causing part of the piston rod to retract into the cylinder, thereby reducing the length of the outrigger structure. In this way, the outrigger structure provides reliable support for the vehicle body, can withstand horizontal forces, solves the problems of seal damage and hydraulic oil leakage, and improves the reliability of the outrigger structure.

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] The leg structure provided in this application refers to... Figure 1 and Figure 2 As shown, it includes: cylinder 100, piston rod 200, first airbag 300, second airbag 400 and pneumatic assembly 500, with cylinder 100 used for connection to vehicle body.

[0042] Part of the piston rod 200 is inserted into the cylinder 100, and a first airbag 300 and a second airbag 400 are respectively provided on both sides of the piston rod 200.

[0043] A pneumatic assembly 500 is connected to a first airbag 300 and a second airbag 400. The pneumatic assembly 500 is configured to control the inflation of the first airbag 300 and the deflation of the second airbag 400 to drive the piston rod 200 away from the cylinder 100. The pneumatic assembly 500 is also configured to control the inflation of the second airbag 400 and the deflation of the first airbag 300 to drive the piston rod 200 toward the cylinder 100.

[0044] Understandably, the cylinder 100 provides a stable connection point for the outrigger structure. The cylinder 100 connects to the vehicle body, providing a stable foundation and ensuring that the outrigger structure can effectively support the vehicle body. Exemplarily, the cylinder 100 can be welded to the vehicle body, bolted together, or connected in other ways; this application embodiment does not impose excessive limitations on these methods.

[0045] The piston rod 200 is the part of the outrigger structure that actually contacts the ground. By moving the piston rod 200 relative to the cylinder 100, the length of the outrigger structure can be adjusted, thereby supporting the vehicle body. The piston rod 200 is telescopic, which also allows the outrigger structure to adapt to different terrains and operational needs.

[0046] It should be noted that the piston rod 200 has a piston 210, and the two sides of the piston 210 abut against the first airbag 300 and the second airbag 400 respectively. When the first airbag 300 or the second airbag 400 inflates, the piston 210 can effectively transmit the force of the first airbag 300 or the second airbag 400, thereby driving the piston rod 200 to move.

[0047] Specifically, both the first airbag 300 and the second airbag 400 are disposed within the cylinder 100 and abut against the piston 210 on the piston rod 200. When the first airbag 300 is inflated, its volume increases, providing an outward thrust to the piston rod 200. Simultaneously, the second airbag 400 deflates, reducing its volume and decreasing the resistance encountered by the piston rod 200 during movement. Thus, the first airbag 300 can push the piston rod 200 away from the cylinder 100, causing a portion of the piston rod 200 to extend beyond the cylinder 100, thereby lifting the tire off the ground.

[0048] The second airbag 400 is fitted onto the piston rod 200 and abuts against the piston 210 on the piston rod 200. When the second airbag 400 is inflated, its volume increases, providing an inward thrust to the piston rod 200. Simultaneously, the first airbag 300 deflates, reducing its volume and decreasing the resistance encountered by the piston rod 200 during movement. Thus, the second airbag 400 can push the piston rod 200 towards the cylinder 100, causing part of the piston rod 200 to retract into the cylinder 100, bringing the tire into contact with the ground.

[0049] It should also be noted that the pneumatic assembly 500 is connected to the first airbag 300 and the second airbag 400 respectively, and the pneumatic assembly 500 can control the inflation and deflation of the first airbag 300 and the second airbag 400. By controlling the state of the first airbag 300 and the second airbag 400, the extension and retraction movement of the piston rod 200 can be realized, providing a flexible control mechanism so that the outrigger structure can be extended and retracted as needed.

[0050] Understandably, compared to the problems of damaged seals and hydraulic oil leakage in existing outriggers, the outrigger structure provided in this embodiment, through the arrangement of a cylinder 100, a piston rod 200, a first airbag 300, a second airbag 400, and a pneumatic assembly 500, connects the cylinder 100 to the vehicle body. A portion of the piston rod 200 is inserted into the cylinder 100, and the first airbag 300 and the second airbag 400 are respectively located on both sides of the piston rod 200. The pneumatic assembly 500 communicates with the first airbag 300 and the second airbag 400. When the pneumatic assembly 500 controls the inflation of the first airbag 300 and the deflation of the second airbag 400, it can drive the piston rod 200 away from the cylinder 100, causing a portion of the piston rod 200 to extend beyond the cylinder 100, thereby increasing the length of the outrigger structure. When the pneumatic assembly 500 controls the inflation of the second airbag 400 and the deflation of the first airbag 300, it can drive the piston rod 200 to move towards the cylinder 100, causing part of the piston rod 200 to retract into the cylinder 100, thereby reducing the length of the outrigger structure. In this way, the outrigger structure provides reliable support for the vehicle body, can withstand horizontal forces, solves the problems of seal damage and hydraulic oil leakage, and improves the reliability of the outrigger structure.

[0051] In some embodiments, refer to Figure 2 and Figure 3 As shown, the sidewall of the first airbag 300 is corrugated, and the second airbag 400 is spiral-shaped.

[0052] Specifically, the corrugated first airbag 300 can generate a large thrust to ensure that the first airbag 300 can push the piston rod 200 to move. The corrugated structure can also disperse external pressure, enhance the pressure resistance of the airbag, and under high pressure conditions, the first airbag 300 can stably maintain its shape, thus improving the reliability of the first airbag 300.

[0053] The second airbag 400 is spiral-shaped and hollow inside, facilitating its installation by fitting it onto the piston rod 200. The spiral structure provides greater mechanical strength and stability, allowing the second airbag 400 to better maintain its shape and reduce deformation when subjected to horizontal forces.

[0054] In some embodiments, refer to Figure 2 and Figure 3As shown, the air pressure assembly 500 includes: a control valve 510, an air inlet pipe 520, and an air outlet pipe 530. The control valve 510 is connected to the first airbag 300 and the second airbag 400, respectively; the air inlet pipe 520 is connected to the control valve 510 and the air source; and the air outlet pipe 530 is connected to the control valve 510.

[0055] The control valve 510 is configured to connect the intake pipe 520 to the first airbag 300 and the exhaust pipe 530 to the second airbag 400, so as to inflate the first airbag 300 and deflate the second airbag 400; the control valve 510 is also configured to connect the intake pipe 520 to the second airbag 400 and the exhaust pipe 530 to the first airbag 300, so as to inflate the second airbag 400 and deflate the first airbag 300.

[0056] It should be noted that the control valve 510 can adjust the direction of airflow. By switching the airflow path, it can selectively inflate the first airbag 300 or the second airbag 400 while simultaneously deflating the other airbag. This achieves a flexible control mechanism, ensuring that the piston rod 200 can be extended and retracted as needed, thus solving the problems of seal damage and hydraulic oil leakage that may occur during the support process of existing outriggers.

[0057] Understandably, the intake pipe 520 connects the control valve 510 to the air source, and can deliver compressed gas from the air source to the control valve 510 to inflate the first airbag 300 or the second airbag 400, providing a stable air source input and ensuring that the first airbag 300 or the second airbag 400 can obtain sufficient air pressure.

[0058] The vent pipe 530 is connected to the control valve 510 and is used to discharge gas from the first airbag 300 or the second airbag 400. Under the action of the control valve 510, the vent pipe 530 provides an effective exhaust path to ensure that the first airbag 300 or the second airbag 400 can exhaust gas quickly so that the first airbag 300 or the second airbag 400 can contract quickly.

[0059] Specifically, when the piston rod 200 needs to extend, the control valve 510 connects the intake pipe 520 to the first air bladder 300, and simultaneously connects the exhaust pipe 530 to the second air bladder 400. In this way, the first air bladder 300 inflates, pushing the piston rod 200 away from the cylinder 100, while the second air bladder 400 deflates to reduce resistance. When the piston rod 200 needs to retract, the control valve 510 connects the intake pipe 520 to the second air bladder 400, and simultaneously connects the exhaust pipe 530 to the first air bladder 300. In this way, the second air bladder 400 inflates, pushing the piston rod 200 towards the cylinder 100, while the first air bladder 300 deflates to reduce resistance.

[0060] In some embodiments, refer to Figure 2 and Figure 3 As shown, the pneumatic assembly 500 also includes two connecting pipes 540, with the first airbag 300 and the second airbag 400 respectively connected to the control valve 510 through the connecting pipes 540.

[0061] Understandably, the first airbag 300 and the second airbag 400 are connected to the control valve 510 via connecting pipes 540, making the airflow transmission between the first airbag 300, the second airbag 400 and the control valve 510 more reliable and efficient, reducing losses and leaks during the airflow transmission process. This ensures that gas can smoothly travel from the control valve 510 to the first airbag 300 and the second airbag 400, or return from the first airbag 300 and the second airbag 400 to the control valve 510.

[0062] It should be noted that the pneumatic assembly 500 may also include two valves 550, with the first airbag 300 and the second airbag 400 respectively connected to the connecting pipe 540 via the valves 550. The valves 550 prevent gas from flowing back from the first airbag 300 or the second airbag 400 to the control valve 510 or the air source, ensuring that the first airbag 300 or the second airbag 400 can maintain the required pressure after inflation, avoiding pressure loss due to backflow, and ensuring that the piston rod 200 can maintain the required support force during operation, thereby improving the stability and reliability of the outrigger structure.

[0063] In some embodiments, refer to Figure 1 and Figure 3 As shown, the outrigger structure also includes a protective sleeve 600. The cylinder 100 has a constricted end 110 at its end. The constricted end 110 is located on the side of the second airbag 400 away from the first airbag 300. The protective sleeve 600 is fitted onto the piston rod 200, and the protective sleeve 600 abuts against the inner wall of the constricted end 110.

[0064] Understandably, by fitting a protective sleeve 600 onto the piston rod 200, wear on the piston rod 200 during movement can be reduced, thus protecting the piston rod 200. For example, the protective sleeve 600 can be a copper sleeve.

[0065] The protective sleeve 600 abuts against the closing end 110, which increases the overall integrity of the structure and improves the stability of the support leg structure. During the extension and retraction of the piston rod 200, the protective sleeve 600 can remain stable and is not easy to shift.

[0066] In some embodiments, refer to Figure 3 As shown, at least one first support portion 120 is provided on the closing end 110, and the first support portion 120 is provided along the extending direction of the closing end 110.

[0067] It should be noted that the first support portion 120 increases the structural strength and rigidity of the tapered end 110, improves the durability and reliability of the outrigger structure, and can better resist external forces and prevent deformation. In specific implementations, the first support portion 120 can be a reinforcing rib.

[0068] In some embodiments, refer to Figure 3 As shown, the piston rod 200 has a limiting part 220, and the first support part 120 abuts against or disengages from the limiting part 220.

[0069] Understandably, the limiting part 220 abuts against the first support part 120, which can limit the maximum retracted position of the piston rod 200 and prevent the piston rod 200 from retracting excessively, so as to avoid the piston rod 200 from causing excessive compression to the first airbag 300, thereby improving the safety and reliability of the outrigger structure.

[0070] In some embodiments, refer to Figure 2 and Figure 3 As shown, a limiting member 130 is provided inside the cylinder 100. The limiting member 130 abuts against the piston rod 200 to restrict part of the piston rod 200 inside the cylinder 100.

[0071] Specifically, the limiting member 130 can limit the range of movement of the piston rod 200, prevent the piston rod 200 from disengaging from the cylinder 100, and also prevent the piston rod 200 from excessively compressing the second airbag 400, thereby further improving the safety and reliability of the outrigger structure.

[0072] In some embodiments, refer to Figure 1 As shown, a second support portion 230 is provided on the piston rod 200, and the second support portion 230 is used to contact the support surface.

[0073] It should be noted that by setting the second support part 230, the contact area between the piston rod 200 and the ground is increased, which can reduce the pressure per unit area on the ground, reduce the pressure, prevent the piston rod 200 from sinking on soft ground, and improve the stability of the piston rod 200 on various terrains.

[0074] Reference Figure 4 As shown, this application also provides a backhoe loader, including a backhoe loader body and any of the outrigger structures provided in the first aspect described above, disposed on the backhoe loader body.

[0075] The specific structure and working method of the outrigger structure have been described in detail in the above embodiments, and will not be repeated here.

[0076] Those skilled in the art will understand that the outrigger structure and excavator loader provided in this application include a cylinder 100, a piston rod 200, a first airbag 300, a second airbag 400, and a pneumatic assembly 500. The cylinder 100 is used to connect to the vehicle body. Part of the piston rod 200 is inserted into the cylinder 100, and the first airbag 300 and the second airbag 400 are respectively provided on both sides of the piston rod 200.

[0077] The pneumatic assembly 500 is connected to the first airbag 300 and the second airbag 400. When the pneumatic assembly 500 controls the inflation of the first airbag 300 and the deflation of the second airbag 400, it can drive the piston rod 200 away from the cylinder 100, causing a portion of the piston rod 200 to extend out of the cylinder 100, thereby increasing the length of the outrigger structure. When the pneumatic assembly 500 controls the inflation of the second airbag 400 and the deflation of the first airbag 300, it can drive the piston rod 200 towards the cylinder 100, causing a portion of the piston rod 200 to retract into the cylinder 100, thereby reducing the length of the outrigger structure. In this way, the outrigger structure provides reliable support for the vehicle body, can withstand horizontal forces, solves the problems of seal damage and hydraulic oil leakage, and improves the reliability of the outrigger structure.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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 this application. 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.

[0079] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0080] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A leg structure, characterized by, The utility model relates to a kind of cylinder and piston rod driving device, including: Cylinder (100) for being connected with vehicle body; Piston rod (200), part of the piston rod (200) is inserted in the cylinder (100), and first air bag (300) and second air bag (400) are respectively arranged on the two sides of the piston rod (200); Air pressure assembly (500) is communicated with the first air bag (300) and the second air bag (400), and the air pressure assembly (500) is configured to control the first air bag (300) to inflate and the second air bag (400) to exhaust, to drive the piston rod (200) to move away from the cylinder (100);The air pressure assembly (500) is also configured to control the second air bag (400) to inflate and the first air bag (300) to exhaust, to drive the piston rod (200) to move towards the cylinder (100).

2. The leg structure of claim 1, wherein The side wall of the first air bag (300) is corrugated, and the second air bag (400) is spiral.

3. The leg structure of claim 1, wherein, The air pressure assembly (500) includes: Control valve (510) is communicated with the first air bag (300) and the second air bag (400) respectively; Air inlet pipe (520) is communicated with the control valve (510) and gas source; Air outlet pipe (530) is communicated with the control valve (510); The control valve (510) is configured to control the air inlet pipe (520) to be communicated with the first air bag (300) and the air outlet pipe (530) to be communicated with the second air bag (400), to inflate the first air bag (300), and exhaust the second air bag (400);The control valve (510) is also configured to control the air inlet pipe (520) to be communicated with the second air bag (400) and the air outlet pipe (530) to be communicated with the first air bag (300), to inflate the second air bag (400), and exhaust the first air bag (300).

4. The leg structure of claim 3, wherein, The air pressure assembly (500) further includes: Two connecting pipes (540), the first air bag (300) and the second air bag (400) are communicated with the control valve (510) through the connecting pipe (540) respectively.

5. The support leg structure according to any one of claims 1 to 4, characterized in that, It further includes protective sleeve (600), the end of the cylinder (100) is provided with close end (110), the close end (110) is located on the side of the second air bag (400) away from the first air bag (300), the protective sleeve (600) is sleeved on the piston rod (200), and the protective sleeve (600) is in abutment with the inner wall of the close end (110).

6. The leg structure of claim 5, wherein, At least one first supporting part (120) is arranged on the close end (110), and the first supporting part (120) is arranged along the extension direction of the close end (110).

7. The leg structure of claim 6, wherein, The piston rod (200) has a limiting portion (220), and the first supporting part (120) is in abutment or out of abutment with the limiting portion (220).

8. The support leg structure according to any one of claims 1 to 4, characterized by A limiting piece (130) is arranged in the cylinder barrel (100), and the limiting piece (130) is in abutment with the piston rod (200) to limit part of the piston rod (200) in the cylinder barrel (100).

9. The support leg structure according to any one of claims 1 to 4, characterized by A second supporting part (230) is arranged on the piston rod (200), and the second supporting part (230) is used to be in contact with a supporting surface.

10. An excavator loader characterized by The excavator loader body and the outrigger structure according to any one of claims 1 to 9 arranged on the excavator loader body.

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