Front outriggers and engineering vehicles

Abstract

The present application discloses a front support leg and an engineering vehicle, comprising: a telescopic leg mechanism having a retracted state and an extended state, the telescopic leg mechanism comprising a first section, a second section mounted within the first section, and a third section mounted within the second section; a hydraulic cylinder assembly disposed within the inner cavity of the telescopic leg mechanism, the hydraulic cylinder assembly being used to drive the telescopic leg mechanism to switch between the extended state and the retracted state; and a guide balance seat disposed within the third section, the hydraulic cylinder assembly being connected to the guide balance seat; when the telescopic leg mechanism switches between the retracted state and the extended state, the hydraulic cylinder assembly drives the guide balance seat to move relative to the third section along the axial direction of the third section; a direction perpendicular to the axial direction of the third section is a first direction, and opposite ends of the guide balance seat along the first direction abut against the inner wall surface of the third section to limit deflection of the hydraulic cylinder assembly along the first direction. The front support leg and the engineering vehicle of the present application can effectively prevent the hydraulic cylinder from deflecting.

Description

Technical Field

[0001] The present application relates to engineering machinery, and in particular to a front outrigger and an engineering vehicle. Background Art

[0002] Many mobile construction machines require support devices for operation. The purpose is to increase the support area and strength to prevent overturning due to excessive loads. In existing technology, construction machines, such as concrete pump trucks, typically use three-stage outriggers that extend and retract using hydraulic cylinders. Support legs on the front and rear outriggers, perpendicular to the outrigger axis, support the entire machine. To increase support strength, these support legs can incorporate hydraulic cylinders.

[0003] The current front outriggers adopt the three-stage form of the following: a. The first-stage outrigger is driven by a motor to drive a chain mechanism + the second and third-stage outriggers are driven by a binding cylinder; b. The first-stage outrigger is driven by an external cylinder + the second and third-stage outriggers are driven by a binding cylinder; among them, form a uses a motor to drive the gear and chain to engage the transmission. During operation, the gear and rack may become stuck and cannot move. Moreover, due to the small space, it is not only inconvenient to repair, but also requires regular oiling and maintenance, which is very troublesome. In form b, when the cylinder is retracted or extended, there is inevitably a gap of several millimeters between the cavity of the upper-stage outrigger body and the lower-stage outrigger, which causes the cylinder to deflect, and the outrigger body is pushed or pulled to one side, and its contact part is abnormally worn and accompanied by abnormal noise. The cylinder itself is relatively long. When extended, the deflection error will be magnified, which will cause the seal in the cylinder to be skewed and worn, aggravated by wear, and resulting in a reduced service life. Summary of the Invention

[0004] In view of this, the embodiments of the present application hope to provide a front support leg and an engineering vehicle that can effectively solve the problem of hydraulic cylinder top deviation.

[0005] To achieve the above objectives, the technical solution of the embodiment of the present application is implemented as follows:

[0006] The front support leg comprises: a telescopic leg mechanism having a retracted state and an extended state, the telescopic leg mechanism comprising a first section, a second section mounted in the first section, and a third section mounted in the second section; a hydraulic cylinder assembly arranged in the inner cavity of the telescopic leg mechanism, the hydraulic cylinder assembly being used to drive the telescopic leg mechanism to switch between the extended state and the retracted state; and a guide balance seat arranged in the third section, the hydraulic cylinder assembly being connected to the guide balance seat; when the telescopic leg mechanism switches between the retracted state and the extended state, the hydraulic cylinder assembly drives the guide balance seat to move relative to the third section along the axial direction of the third section; the direction perpendicular to the axial direction of the third section is the first direction, and the opposite ends of the guide balance seat along the first direction abut against the inner wall surface of the third section to limit the deflection of the hydraulic cylinder assembly along the first direction.

[0007] Furthermore, the hydraulic cylinder assembly includes: a first hydraulic cylinder arranged in the inner cavity of the first section, the first hydraulic cylinder being capable of causing the first section to extend and retract; a second hydraulic cylinder arranged in the inner cavity of the first section, the second hydraulic cylinder being capable of causing the second section to extend and retract relative to the first section; and a third hydraulic cylinder arranged in the inner cavity of the second section, the third hydraulic cylinder being capable of causing the third section to extend and retract relative to the second section; the second hydraulic cylinder includes a second piston rod and a second cylinder body, the third hydraulic cylinder includes a third piston rod and a third cylinder body, and the guide balance seat is capable of fixing the second piston rod and the third cylinder body relative to each other.

[0008] Furthermore, the guide balance seat includes a first connecting part and a second connecting part; the second cylinder body is fixed relative to the first section, the second piston rod is hinged to the first connecting part, the first end of the third cylinder body is hinged to the second section, and the second end of the third cylinder body is hinged to the second connecting part; the third piston rod is hinged to the third section.

[0009] Furthermore, the connecting line between the second cylinder body and the first connecting portion is collinear with the central axis of the second section; and / or the axial direction of the third cylinder body is parallel to the central axis of the third section.

[0010] Furthermore, a first lug is formed in the inner cavity of the second section at one end close to the first section, and the first lug is hinged to the first end of the third cylinder.

[0011] Furthermore, a line connecting the first lug and the second connecting portion is parallel to a central axis of the third segment.

[0012] Furthermore, the guide balance seat includes a first arm and a second arm connected at the ends; along the first direction, the first arm abuts against the upper top plate of the inner cavity of the third section, and the second arm abuts against the lower bottom plate of the inner cavity of the third section to limit the displacement of the guide balance seat along the first direction.

[0013] Furthermore, the first end of the first support arm and the first end of the second support arm are integrally formed; the first support arm includes a first roller, and along the first direction, the second end of the first support arm is in contact with the upper top plate through the first roller; and / or, the second support arm includes a second roller, and along the first direction, the second end of the second support arm is in contact with the lower bottom plate through the second roller.

[0014] Furthermore, the lower base plate is a smooth flat plate; and / or the upper top plate is a smooth flat plate.

[0015] Furthermore, the guide balance seat includes a first connecting portion and a second connecting portion for connecting the hydraulic cylinder assembly, the first connecting portion is arranged at the intersection of the first support arm and the second support arm, and the second connecting portion is arranged on the second support arm.

[0016] Furthermore, the front support leg includes a fixing mechanism; the first section is sleeved in the fixing mechanism; and the first hydraulic cylinder can enable the first section to extend and retract relative to the fixing mechanism.

[0017] Furthermore, the first hydraulic cylinder includes a first piston rod and a first cylinder body, the first piston rod is hinged to the fixing mechanism, and the first cylinder body is fixedly connected to the second cylinder body.

[0018] Furthermore, when the telescopic leg mechanism is in a retracted state, the guide balance seat is located at an end of the third section close to the second section; when the telescopic leg mechanism is in an extended state, the guide balance seat is located at an end of the third section away from the second section.

[0019] An engineering vehicle, comprising a vehicle body and the above-mentioned front support legs; the first section is slidably connected to the vehicle body, and when the telescopic leg mechanism is in a retracted state, the telescopic leg mechanism is stored in the vehicle body.

[0020] The front support leg and the engineering vehicle of the embodiment of the present application are provided with a guide balance seat, and the hydraulic cylinder assembly is connected to the guide balance seat. The opposite ends of the guide balance seat along the first direction abut against the inner wall surface of the third section to limit the deflection of the hydraulic cylinder assembly along the first direction. When the telescopic leg mechanism switches between the retracted state and the extended state, the hydraulic cylinder assembly drives the guide balance seat to move relative to the third section along the axial direction of the third section, that is, the guide balance seat can slide from one end of the third section to the other end. When the telescopic leg mechanism switches between the retracted state and the extended state, the hydraulic cylinder assembly is ejected or retracted accordingly, and the deflection torque of the hydraulic cylinder assembly is transmitted to the inner wall of the third section through the guide balance seat, thereby effectively overcoming the torque, so as to realize the function of the guide balance seat in limiting the deflection of the hydraulic cylinder assembly along the first direction, and ultimately effectively prevent the hydraulic cylinder assembly from deflecting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the front legs according to an embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of the front support legs of another embodiment of the present application;

[0023] Figure 3 A partial schematic diagram of the assembly of the second and third sections;

[0024] Figure 4 A partial schematic diagram of the assembly of the first section and the second section;

[0025] Figure 5 This is a schematic diagram of the assembly relationship between the hydraulic cylinder assembly and the guide balance seat according to an embodiment of the present application, wherein each hydraulic cylinder of the hydraulic cylinder assembly is retracted;

[0026] Figure 6 A first perspective view of the guide balance seat according to an embodiment of the present application;

[0027] Figure 7 for Figure 6 A second perspective view of the center guide balance seat. DETAILED DESCRIPTION

[0028] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation methods should be understood as an explanation of this application and should not be regarded as an improper restriction on this application.

[0029] In the description of the embodiments of the present application, the directions or positional relationships of "up", "down", "left", "right", "front", and "back" are based on the attached Figure 2Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0030] like Figures 1 to 7 As shown, the front outrigger is used on engineering machinery to provide support. Here, a pump truck is used as an example for explanation.

[0031] The front support leg includes: a telescopic leg mechanism 1 having a retracted state and an extended state, a hydraulic cylinder assembly 3 arranged in the inner cavity of the telescopic leg mechanism 1, and a guide balance seat 4 arranged in the third section 13.

[0032] The telescopic leg mechanism 1 includes a first section 11, a second section 12 sleeved in the first section 11, and a third section 13 sleeved in the second section 12; the hydraulic cylinder assembly 3 is used to drive the telescopic leg mechanism 1 to switch between the deployed state and the retracted state.

[0033] Specifically, the hydraulic cylinders of the hydraulic cylinder assembly 3 are retracted (the hydraulic cylinders include the first hydraulic cylinder 31, the second hydraulic cylinder 32 and the third hydraulic cylinder 33 mentioned below), the telescopic leg mechanism 1 is in a retracted state, the first section 11, the second section 12 and the third section 13 are all in a retracted state, and the front legs are folded to facilitate the transfer of engineering machinery; the hydraulic cylinders of the hydraulic cylinder assembly 3 are extended, the telescopic leg mechanism 1 is in an extended state, the first section 11, the second section 12 and the third section 13 are all in an extended state, and the front legs are extended outward for support to facilitate the work of engineering machinery. The telescopic leg mechanism 1 is switched between the retracted state and the extended state by the extension and retraction of the hydraulic cylinders of the hydraulic cylinder assembly 3.

[0034] The hydraulic cylinder assembly 3 is connected to the guide balance seat 4, and the opposite ends of the guide balance seat 4 along the first direction abut against the inner wall surface of the third section to limit the deflection of the hydraulic cylinder assembly 3 along the first direction. The first direction is the up-down direction perpendicular to the axial direction of the third section 13.

[0035] Specifically, when the telescopic leg mechanism 1 switches between the retracted state and the deployed state, the hydraulic cylinder assembly 3 drives the guide balance seat 4 to move relative to the third section 13 along the axial direction of the third section 13, that is, the guide balance seat 4 can slide from one end of the third section 13 to the other end. When the telescopic leg mechanism 1 switches between the retracted state and the deployed state, the hydraulic cylinder assembly 3 is ejected or retracted accordingly. Since the ejection or retraction direction of the hydraulic cylinder assembly 3 is not collinear with the axial direction of the first section 11, the second section 12 and the third section 13, there is a torque. This torque is transmitted to the inner wall of the third section 13 through the guide balance seat 4, thereby effectively overcoming the torque, so as to realize the function of the guide balance seat 4 to limit the deflection of the hydraulic cylinder assembly 3 along the first direction, and ultimately effectively prevent the hydraulic cylinder assembly 3 from deflecting.

[0036] A possible implementation method is as follows: Figures 1 to 5 As shown, the hydraulic cylinder assembly 3 includes a first hydraulic cylinder 31 disposed in the inner cavity of the first section 11 , a second hydraulic cylinder 32 disposed in the inner cavity of the first section 11 , and a third hydraulic cylinder 33 disposed in the inner cavity of the second section 12 .

[0037] The first hydraulic cylinder 31 enables the first section 11 to extend and retract; when retracted, the first section 11 can be stored within the body of the construction vehicle, or retracted into a fixed structure 14 (described below), which is typically mounted on the body of the construction vehicle. The second hydraulic cylinder 32 enables the second section 12 to extend and retract relative to the first section 11. The third hydraulic cylinder 33 enables the third section 13 to extend and retract relative to the second section 12.

[0038] The second hydraulic cylinder 32 includes a second piston rod 32a and a second cylinder body 32b, and the third hydraulic cylinder 33 includes a third piston rod 33a and a third cylinder body 33b. The second piston rod 32a and the third cylinder body 33b are respectively connected to the guide balance seat 4. Thus, the guide balance seat 4 enables the second piston rod 32a and the third cylinder body 33b to be connected as a whole and relatively fixed. That is, along the axial direction of the third section 13, the two advance and retreat together.

[0039] A possible implementation method is as follows: Figures 3 to 7 As shown, the guide balance seat 4 includes a first connecting portion 43 and a second connecting portion 44 .

[0040] The second cylinder 32b is fixed relative to the first segment 11, and the second piston rod 32a is hingedly connected to the first connecting portion 43. The first end of the third cylinder 33b, away from the third segment 13, is hingedly connected to the second segment 12; the second end of the third cylinder 33b, closer to the third segment 13, is hingedly connected to the second connecting portion 44. The third piston rod 33a is hingedly connected to the third segment 13.

[0041] Taking the example of the second hydraulic cylinder 32 causing the second section 12 to expand relative to the first section 11, the process is as follows: the second piston rod 32a extends from the second cylinder body 32b, and the second piston rod 32a transmits the force to the guide balance seat 4 through the first connecting part 43, and the guide balance seat 4 transmits the force to the third cylinder body 33b through the second connecting part 44, and the first end of the third cylinder body 33b transmits the force to the second section 12, and finally causes the second section 12, the third section 13 and the guide balance seat 4 to move axially forward together. During this process, the third section 13 is accommodated in the inner cavity of the second section 12, and the guide balance seat 4 is located in the end of the third section 13 away from the first section 11. Even if a moment arm exists between the axial direction of the second section 12 and the direction of force applied by the second piston rod 32a, generating a torque, the torque acts on the second piston rod 32a, which is transmitted to the guide balance seat 4 through the first connecting portion 43. The guide balance seat 4 then transmits the torque to the inner wall of the third section 13, thereby effectively overcoming the torque and preventing the second hydraulic cylinder 32 from deflecting. The second hydraulic cylinder 32 retracts the second section 12 relative to the first section 11. The principle is the same, and the process is reversed, so it will not be repeated here.

[0042] After the second section 12 is deployed into position relative to the first section 11, taking the third hydraulic cylinder 33 as an example to make the third section 13 deployed relative to the second section 12, the process is as follows: the third piston rod 33a extends from the third cylinder body 33b, the position of the third cylinder body 33b and the second section 2 is relatively fixed, the third piston rod 33a is hinged to the third section 13, and the third section 13 is deployed relative to the second section 12.

[0043] It should be understood that the first end of the third cylinder 33b, which is away from the third section 13, is hingedly connected to the second section 12, thereby limiting the first end of the third cylinder 33b in the first direction. The second end of the third cylinder 33b, which is closer to the third section 13, is hingedly connected to the second connecting portion 44. Since the third section 13 can limit the deflection of the guide balance seat 4 in the first direction, the second end of the third cylinder 33b is also limited in the first direction. As a result, the position of the third cylinder 33b and the second section 2 is relatively fixed. Even if there is a moment arm between the axial direction of the third section 13 and the direction of force applied by the third piston rod 33a, and a torque is generated, the torque acts on the third piston rod 33a and is then transmitted to the third cylinder 33b. The third cylinder 33b is then transmitted to the guide balance seat 4 through the second connecting portion 44, and the guide balance seat 4 is then transmitted to the inner wall of the third section 13, thereby effectively overcoming the torque and preventing the third hydraulic cylinder 33 from deflecting. The third hydraulic cylinder 33 retracts the third section 13 relative to the second section 12 . The principle is the same and the process is opposite, so it will not be described in detail here.

[0044] In various embodiments of the present application, the first connecting portion 43 can be a pin or a pin hole; the second connecting portion 44 can be a pin or a pin hole. When the pins or pin holes are not strong enough due to their thickness, the corresponding number can be appropriately increased.

[0045] In one possible implementation, the line connecting the end of the second cylinder body 32b and the first connecting part 43 is collinear with the central axis of the second section 12, and the axial direction of the third cylinder body 33b is parallel to the central axis of the third section 13, thereby reducing the deflection torque of the second hydraulic cylinder 32 / third hydraulic cylinder 33 during the extension and retraction process.

[0046] It is understandable that in each embodiment of the present application, since the first section 11, the second section 12 and the third section 13 of the telescopic leg mechanism 1 are connected step by step, the axial directions of the first section 11, the second section 12 and the third section 13 coincide with each other; the axial direction of the first section 11, the second section 12 or the third section 13 may refer to the axial direction of the telescopic mechanism 1. When the first section 11, the second section 12 and the third section 13 are regular geometric bodies, such as hollow cylinders or hollow columns, the central axis refers to the axis along the axial direction and passing through the geometric center of their cross-sections, and therefore the central axis of the first section 11, the central axis of the second section 12 and the central axis of the third section 13 also coincide with each other.

[0047] A possible implementation method is as follows: Figure 1 、 Figure 2 and Figure 4 As shown, a first lug 121 is formed in the inner cavity of the second segment 12 at one end close to the first segment 11 , and the first lug 121 is hinged to the first end of the third cylinder 33 b.

[0048] Along the first direction, the height of the first lug 121 can be set to be consistent with the height of the second connecting part 44, so that the connecting line between the first lug 121 and the second connecting part 44 is parallel to the central axis of the third section 13, thereby making the axial direction of the third cylinder body 33b parallel to the central axis of the third section 13, thereby reducing the deflection torque of the third hydraulic cylinder 33 during the extension and retraction process.

[0049] A possible implementation method is as follows: Figures 3 to 7As shown, the guide balance seat 4 includes a first arm 41 and a second arm 42 connected at the ends; along the first direction, the first arm 41 abuts against the upper top plate 131 of the inner cavity of the third section 13, and the second arm 42 abuts against the lower bottom plate 132 of the inner cavity of the third section 13, so as to limit the displacement of the guide balance seat 4 along the first direction, so that when there is an eccentric torque, the guide balance seat 4 can abut against the corresponding upper top plate 131 or lower bottom plate 132 through the first arm 41 or the second arm 42, thereby preventing the second hydraulic cylinder 32 and the third hydraulic cylinder 33 of the hydraulic cylinder assembly 3 from deflecting and causing abnormal wear, and preventing abnormal noise caused by the second section 12 relative to the first section 11 and the third section 13 relative to the second section 12 due to top deviation or pulling deviation.

[0050] The first connecting portion 43 can be arranged at the intersection of the first support arm 41 and the second support arm 42, and the second connecting portion 44 can be arranged on the second support arm 42. The first connecting portion 43 is hinged to the second piston rod 32a, and the second connecting portion 43 is hinged to the third cylinder body 33b. The second piston rod 32a and the third cylinder body 33b are kept fixed by the guide balance seat 4 to realize torque transmission and prevent the hydraulic cylinder assembly 3 from deflecting.

[0051] A possible implementation method is as follows: Figures 3 to 7 As shown, the first end of the first arm 41 and the first end of the second arm 42 are integrally formed, and the connection strength is good and can withstand a larger eccentric torque.

[0052] The first support arm 41 includes a first roller 411. Along the first direction, the second end of the first support arm 41 abuts against the upper top plate 131 of the inner cavity of the third section 13 via the first roller 411. The first roller 411 reduces the friction between the second end of the first support arm 41 and the upper top plate 131 when the second end of the first support arm 41 moves axially along the third section 13. Similarly, the second support arm 42 includes a second roller 421. Along the first direction, the second end of the second support arm 42 abuts against the lower bottom plate 132 of the inner cavity of the third section 13 via the second roller 421. The second roller 421 reduces the friction between the second end of the second support arm 42 and the lower bottom plate 132 when the second end of the second support arm 42 moves axially along the third section 13. This reduces the friction between the second end of the second support arm 42 and the lower bottom plate 132 when the second end of the second support arm 42 moves axially along the third section 13, resulting in smoother movement.

[0053] The first roller 411 can be a nylon roller; the second roller 421 can be a nylon roller, which is light and wear-resistant.

[0054] In a possible implementation manner, guide rails corresponding to the first roller 411 and the second roller 421 along the axial direction of the third section 13 may be provided on the surfaces of the upper plate 131 and the lower plate 132 .

[0055] In one possible embodiment, the upper plate 131 is a smooth flat plate to reduce the friction force of the first roller 411 rolling on the upper plate 131 along the axial direction of the third section 13. The lower base plate 132 is a smooth flat plate to reduce the friction force of the second roller 421 rolling on the upper plate 131 along the axial direction of the third section 13.

[0056] A possible implementation method is as follows: Figure 2 As shown, the front outrigger includes a fixing mechanism 5; a first section 11 is mounted within the fixing mechanism 5; and a first hydraulic cylinder 31 is capable of extending and retracting the first section 11 relative to the fixing mechanism 5. Typically, the fixing mechanism 5 is embedded within the body of the engineering vehicle. When the first section 11, the second section 12, and the third section 13 are retracted, the fixing mechanism 5 can accommodate the retracted telescopic leg mechanism 1.

[0057] A possible implementation method is as follows: Figure 1 and Figure 2 As shown, the first hydraulic cylinder 31 includes a first piston rod 31a and a first cylinder body 31b. The first piston rod 31a is hinged to the fixing mechanism 5, and the first cylinder body 31b is fixedly connected to the second cylinder body 32b. The connection method can be welding or screw fixing, so that the first cylinder body 31b and the second cylinder body 32b are fixed as one.

[0058] Taking the example of the first hydraulic cylinder 31 making the first section 11 unfold relative to the fixing mechanism 5, the process is as follows: the first piston rod 31 extends from the first cylinder body 31b, the first piston rod 31 is fixed to the fixing mechanism 5, the first cylinder body 31b is subjected to a reaction force, the first cylinder body 31b drives the second cylinder body 32b to move backward, the second piston rod 32a transmits the force to the guide balance seat 4 through the first connecting part 43, the guide balance seat 4 transmits the force to the third cylinder body 33b through the second connecting part 44, and the first end of the third cylinder body 33b transmits the force to the second section 12, finally making the first section 11, the second section 12, the third section 13 and the guide balance seat 4 move axially forward together.

[0059] The first hydraulic cylinder 31b and the second hydraulic cylinder 32b are fixedly connected to each other, so that the first hydraulic cylinder 31 and the second hydraulic cylinder 32 are bundled together; the second piston rod 32a and the third cylinder 33b are connected as a whole through the guide balance seat 4, and the two are relatively fixed, so that the second hydraulic cylinder 32 and the second hydraulic cylinder 33 are bundled together, thereby realizing a three-level bundled connection hydraulic cylinder assembly 3 structure.

[0060] It is understood that since the guide balancing seat 4 can slide axially along the third section 13, the first end of the third cylinder body 33b can be hinged to the second section 12. When the telescopic leg mechanism 1 is in the retracted state, the guide balancing seat 4 is located in the inner cavity of the third section 13, near the end of the second section 12. When the telescopic leg mechanism 1 is in the deployed state, the guide balancing seat 4 is located in the inner cavity of the third section 13, away from the end of the second section 12. A first lug 121 is provided at the hinge, and interference can be prevented by properly setting the length of the third section 13 and the position of the first lug 121. The three-stage bundled hydraulic cylinder assembly 3 + guide balancing seat 4 structure reduces the number of fixed lugs within each section of the telescopic leg mechanism 1, resulting in a compact structure. The fully internal hydraulic cylinder assembly 3 effectively avoids the risk of oil pipe crushing that may occur when the hydraulic cylinder is externally installed. In addition, the guide balancing seat 4 can also prevent the hydraulic cylinder of the hydraulic cylinder assembly 3 from deflecting.

[0061] An engineering vehicle has any one of the front legs described above, wherein the first section 11 is slidably connected to the vehicle body, and when the telescopic leg mechanism 1 is in a retracted state, the telescopic leg mechanism 1 is stored in the vehicle body.

[0062] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0063] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. Front support legs, characterized in that: include: A telescopic leg mechanism (1) having a retracted state and an extended state, the telescopic leg mechanism (1) comprising a first section (11), a second section (12) sleeved within the first section (11), and a third section (13) sleeved within the second section (12); a hydraulic cylinder assembly (3) disposed in the inner cavity of the telescopic leg mechanism (1), the hydraulic cylinder assembly (3) being used to drive the telescopic leg mechanism (1) to switch between the deployed state and the retracted state; and a guide balance seat (4) disposed in the third section (13), the hydraulic cylinder assembly (3) being connected to the guide balance seat (4); When the telescopic leg mechanism (1) switches between the retracted state and the deployed state, the hydraulic cylinder assembly (3) drives the guide balance seat (4) to move relative to the third section (13) along the axial direction of the third section (13); a direction perpendicular to the axial direction of the third section (13) is a first direction, and opposite ends of the guide balance seat (4) along the first direction abut against the inner wall surface of the third section to limit the deflection of the hydraulic cylinder assembly (3) along the first direction; The hydraulic cylinder assembly (3) comprises: a second hydraulic cylinder (32) disposed in the inner cavity of the first section (11), wherein the second hydraulic cylinder (32) is capable of causing the second section (12) to extend and retract relative to the first section (11); a third hydraulic cylinder (33) disposed in the inner cavity of the second section (12), wherein the third hydraulic cylinder (33) is capable of causing the third section (13) to extend and retract relative to the second section (12); The second hydraulic cylinder (32) includes a second piston rod (32a) and a second cylinder body (32b), and the third hydraulic cylinder (33) includes a third piston rod (33a) and a third cylinder body (33b); The second cylinder body (32b) is fixed relative to the first section (11), and the first end of the third cylinder body (33b) away from the third section (13) is hinged to the second section (12); the guide balance seat (4) connects the second piston rod (32a) and the third cylinder body (33b) into one body, thereby realizing the bundling of the second hydraulic cylinder (32) and the third hydraulic cylinder (33).

2. The front support leg according to claim 1, characterized in that: The hydraulic cylinder assembly (3) comprises: A first hydraulic cylinder (31) is arranged in the inner cavity of the first section (11), and the first hydraulic cylinder (31) can make the first section (11) extend and retract.

3. The front support leg according to claim 2, characterized in that: The guide balance seat (4) includes a first connecting portion (43) and a second connecting portion (44); the second cylinder body (32b) is fixed relative to the first section (11), the second piston rod (32a) is hinged to the first connecting portion (43), the first end of the third cylinder body (33b) is hinged to the second section (12), and the second end of the third cylinder body (33b) is hinged to the second connecting portion (44); the third piston rod (33a) is hinged to the third section (13).

4. The front support leg according to claim 3, characterized in that: The connecting line between the second cylinder (32b) and the first connecting portion (43) is collinear with the central axis of the second section (12); and / or, The axial direction of the third cylinder (33b) is parallel to the central axis of the third section (13).

5. The front support leg according to claim 3, characterized in that: A first lug (121) is formed in the inner cavity of the second section (12) at one end close to the first section (11), and the first lug (121) is hinged to the first end of the third cylinder (33b).

6. The front support leg according to claim 5, characterized in that: The connecting line between the first lug (121) and the second connecting portion (44) is parallel to the central axis of the third segment (13).

7. The front support leg according to claim 1, characterized in that: The guide balance seat (4) includes a first support arm (41) and a second support arm (42) connected at their ends; along a first direction, the first support arm (41) abuts against an upper top plate (131) of the inner cavity of the third section (13), and the second support arm (42) abuts against a lower bottom plate (132) of the inner cavity of the third section (13), so as to limit the displacement of the guide balance seat (4) along the first direction.

8. The front support leg according to claim 7, characterized in that: The first end of the first support arm (41) and the first end of the second support arm (42) are integrally formed; The first support arm (41) includes a first roller (411), and along the first direction, the second end of the first support arm (41) passes through the first roller (411) to abut against the upper top plate (131); And / or, the second support arm (42) includes a second roller (421), and along the first direction, the second end of the second support arm (42) abuts against the lower base plate (132) through the second roller (421).

9. The front support leg according to claim 8, characterized in that: The lower base plate (132) is a smooth flat plate; and / or the upper top plate (131) is a smooth flat plate.

10. The front support leg according to claim 7, characterized in that: The guide balance seat (4) comprises a first connecting portion (43) and a second connecting portion (44) for connecting to the hydraulic cylinder assembly (3); the first connecting portion (43) is arranged at the intersection of the first support arm (41) and the second support arm (42); and the second connecting portion (44) is arranged on the second support arm (42).

11. The front support leg according to claim 2, characterized in that: The front support leg comprises a fixing mechanism (5); the first section (11) is sleeved in the fixing mechanism (5); and the first hydraulic cylinder (31) is capable of causing the first section (11) to extend and retract relative to the fixing mechanism (5).

12. The front support leg according to claim 11, characterized in that: The first hydraulic cylinder (31) comprises a first piston rod (31a) and a first cylinder body (31b); the first piston rod (31a) is hinged to the fixing mechanism (5); and the first cylinder body (31b) is fixedly connected to the second cylinder body (32b).

13. The front support leg according to any one of claims 1 to 12, characterized in that: The telescopic leg mechanism (1) is in a retracted state, and the guide balance seat (4) is located at one end of the third section (13) close to the second section (12); the telescopic leg mechanism (1) is in an extended state, and the guide balance seat (4) is located at one end of the third section (13) away from the second section (12).

14. Engineering vehicle, characterized in that: The engineering vehicle comprises a vehicle body and a front support leg as described in any one of claims 1 to 13; the first section (11) is slidably connected to the vehicle body, and when the telescopic leg mechanism (1) is in a retracted state, the telescopic leg mechanism is stored in the vehicle body.

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