Foldable supporting leg and overhead working truck

Abstract

The utility model discloses a foldable supporting leg and an overhead working truck, and belongs to the technical field of overhead working trucks. The supporting leg comprises a first hydraulic cylinder, one end of the first hydraulic cylinder is connected with a transverse leg main arm, and the other end is connected with a transverse leg telescopic arm. The transverse leg telescopic arm is nested in the transverse leg main arm and can slide in the transverse leg main arm; the transverse leg telescopic arm is hinged with the vertical leg; the transverse leg telescopic arm is hinged to a first dead point rod, the vertical leg is hinged to a second dead point rod, and the first dead point rod is hinged to the second dead point rod; the other end of the second hydraulic cylinder is hinged with the first dead point rod; the transverse leg main arm is arranged on the carrying mechanism; when the supporting leg is in a folded state, the first dead point rod and the second hydraulic cylinder are contracted in the hollow structure in the transverse leg telescopic arm, the second dead point rod is contracted in the hollow structure in the vertical leg, and the vertical leg and the transverse leg telescopic arm are jointly contracted in the transverse leg main arm. The dead point structure and the reinforcing ribs are adopted, so that materials and cost are saved, and the overall stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to high altitude operation vehicle technical field, concretely is a kind of foldable support leg and high altitude operation vehicle. BACKGROUND

[0002] High-altitude operation vehicle is a kind of multifunctional engineering vehicle designed for high-altitude operation scene, and its core function is to safely and efficiently deliver personnel and equipment to a specified height by means of machinery, platforms or other devices to complete various high-altitude operation tasks. In recent years, with the acceleration of urbanization and the continuous advancement of infrastructure construction, its market demand continues to grow. This type of equipment is not only widely used in construction, power, landscaping and other industries, but also shows great application potential in petrochemical, communication, disaster rescue and other special fields. Support leg is an essential functional component of high-altitude operation vehicle, and its carrying capacity is related to the working safety of high-altitude operation vehicle. If the support leg is damaged or fails, it will cause the whole operation vehicle to tilt or even collapse, causing serious accidents. Therefore, the design of support leg must ensure high structural stability and safety.

[0003] For example, the utility model patent with application number CN202021329957.8 discloses a spider leg structure of high-altitude operation vehicle, the upper end of the support leg is installed on the frame of the high-altitude operation vehicle through the connecting lug, and the middle part of the support leg is provided with a hydraulic cylinder between the connecting lug. This patent sets a hydraulic support leg on the support leg, which enhances the stability of the device during overall operation. The invention patent with application number CN201210020447.6 discloses a support system and engineering machinery with the support system, which is composed of a first support leg, a second support leg, a third support leg and a fourth support leg, and an additional support leg is arranged between the third support leg and the fourth support leg. Due to the arrangement of the additional support leg, the anti-rollover ability and support ability of the whole vehicle are improved. The utility model patent with application number CN202222921714.9 discloses an automatic locking type high-altitude operation vehicle support leg. The working pneumatic cylinder pushes the clamping plate into the inner part of the clamping groove, so that the clamping plate is clamped between the movable support rod and the support box. At this time, even if the hydraulic cylinder fails out of control, the movable support rod subjected to force cannot enter the inner part of the mounting pipe due to the limitation of the clamping plate, and the self-locking of the support leg composed of the mounting pipe, the buffer block and other parts is completed, which ensures the stability of the support leg composed of the mounting pipe, the buffer block and other parts to the tracked high-altitude operation vehicle body, and reduces the occurrence of accidents.

[0004] The larger support leg in the prior art not only increases the width of the vehicle body, but also increases the difficulty of road transportation. In a crowded operation environment, the wide body of the vehicle is easy to scratch with surrounding equipment, building structure or pipeline, damaging the vehicle body or other property. At the same time, the stability, anti-rollover performance and other performances of the support leg in the prior art still need to be improved.

[0005] Therefore, it is necessary to provide a foldable support leg and aerial work vehicle to solve the above technical problems in the prior art. Utility model content

[0006] The utility model discloses a foldable support leg and aerial work vehicle to realize the folding contraction of the support leg of aerial work vehicle, and the key components of the support leg are monitored and controlled.

[0007] To realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A foldable support leg, comprising a horizontal leg main arm, a horizontal leg telescopic arm, a first hydraulic cylinder, a second hydraulic cylinder and a vertical leg.

[0009] One end of the first hydraulic cylinder is connected with the horizontal leg main arm, and the other end of the first hydraulic cylinder is connected with the horizontal leg telescopic arm.

[0010] The horizontal leg telescopic arm is nested in the horizontal leg main arm, and can slide in the horizontal leg main arm.

[0011] The vertical leg is hinged to one end of the horizontal leg telescopic arm away from the horizontal leg main arm.

[0012] The first dead point rod is hinged to the horizontal leg telescopic arm, the second dead point rod is hinged to the vertical leg, and the first dead point rod is hinged to the second dead point rod.

[0013] One end of the second hydraulic cylinder is hinged to the horizontal leg telescopic arm, and the other end of the second hydraulic cylinder is hinged to one end of the first dead point rod away from the horizontal leg telescopic arm.

[0014] The end of the horizontal leg main arm away from the vertical leg is arranged on the aerial work vehicle carrying mechanism.

[0015] When the support leg is in the folded state, the first dead point rod and the second hydraulic cylinder are retracted in the internal hollow structure of the horizontal leg telescopic arm, the second dead point rod is retracted in the internal hollow structure of the vertical leg, and the vertical leg and the horizontal leg telescopic arm are retracted in the horizontal leg main arm.

[0016] Preferably, it further includes a foot support, and the foot support is arranged at one end of the vertical leg in contact with the ground.

[0017] Preferably, it further includes a protective cover, and the protective cover is sleeved outside one end of the horizontal leg main arm away from the vertical leg.

[0018] Preferably, the first hydraulic cylinder and the second hydraulic cylinder are connected with a hydraulic pump.

[0019] Preferably, reinforcing ribs are arranged in the internal hollow structure of the horizontal leg telescopic arm and the internal hollow structure of the vertical leg.

[0020] Preferably, the material of the foldable support leg is high-strength low-carbon steel.

[0021] An aerial work platform is provided with the foldable support leg.

[0022] Preferably, the aerial work platform is provided with a carrying mechanism, the carrying mechanism is provided with a rotating mechanism, an arm mechanism and a working platform.

[0023] The foldable support leg is arranged in an X shape on the carrying mechanism.

[0024] One end of the arm mechanism is connected to the rotating mechanism, and the other end of the arm mechanism is connected to the working platform.

[0025] Preferably, the aerial work platform is provided with a sensor and a control unit.

[0026] The sensor is arranged on the foldable support leg and the arm mechanism, and the sensor is connected to the control unit.

[0027] Preferably, the sensor comprises a stress sensor, a position sensor, a bending moment sensor and an angle sensor.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] 1. The foldable support leg adopts dead point structure and reinforcing ribs, which not only saves materials and reduces cost, but also improves the structural mechanical properties and overall stability.

[0030] 2. When the aerial work platform is in a non-working state, the horizontal leg folding arm and the vertical leg of the support leg can be folded and stored through the hydraulic cylinder and other components, effectively reducing the overall width of the vehicle, improving the passability of the vehicle, and meeting more road conditions.

[0031] 3. The aerial work platform further comprises a control unit and a sensor, which can monitor the real-time mechanical data of the stiffness, strength and fatigue of the key parts; the aerial work platform can alarm and stop abnormally, which is convenient for reminding the vehicle operator to maintain in time, avoids the occurrence of dangerous events, and greatly improves the safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below.

[0033] Figure 1 is a structural schematic view of the foldable support leg;

[0034] Figure 2 is a sectional view of the foldable support leg;

[0035] Figure 3 is a B-B sectional view of Figure 2 ; and

[0036] Figure 4 is Figure 2 a C-C sectional view of

[0037] Figure 5 is an exploded view of the foldable support leg;

[0038] Figure 6 is an enlarged view of the hinge between the first dead point rod and the second dead point rod;

[0039] Figure 7 is a D-D sectional view of Figure 6

[0040] Figure 8 is a working range diagram of the foldable support leg;

[0041] Figure 9 is an assembly diagram of the aerial work platform;

[0042] Figure 10 is an assembly diagram of the aerial work platform with the foldable support leg folded;

[0043] Figure 11 is a structural diagram of the carrier mechanism;

[0044] Figure 12 is an A-A sectional view of Figure 11

[0045] Figure 13 is a structural diagram of the slewing mechanism;

[0046] Figure 14 is an exploded view of the slewing mechanism;

[0047] Figure 15 is a structural diagram of the jib mechanism;

[0048] Figure 16 is a diagram of the overall mechanical analysis of the aerial work platform;

[0049] Figure 17 is a diagram of the overall mechanical analysis of the aerial work platform;

[0050] Figure 18 is a diagram of the mechanical analysis of the foldable support leg;

[0051] Figure 19 is a normal stress auxiliary calculation diagram;

[0052] Figure 20 is a shear stress auxiliary calculation diagram;

[0053] Figure 21 is a bending moment auxiliary calculation diagram;

[0054] Figure 22 ​​is a sensor arrangement of the foldable support leg;

[0055] Figure 23 is Figure 22 is a partial enlarged view at A in the middle;

[0056] Figure 24 is Figure 22 is a partial enlarged view at B in the middle;

[0057] Figure 25 is Figure 22 is a partial enlarged view at C in the middle;

[0058] Figure 26 is a structural schematic view of the first dead point rod. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0060] Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the present application.

[0061] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly. In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0062] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] In addition, the technical solutions of various embodiments of the utility model can be combined with each other, but must be based on that ordinary skilled in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0064] Embodiment 1

[0065] As Figures 1 to 8 The utility model discloses a foldable support leg. The support leg comprises a horizontal leg telescopic arm II-1, a first hydraulic cylinder II-3, a second hydraulic cylinder II-2, a horizontal leg main arm II-4, a protective cover II-5, a first dead point rod II-6, a second dead point rod II-7, a foot support II-8 and a vertical leg II-9.

[0066] One end of the first hydraulic cylinder II-3 is connected to the horizontal leg main arm II-4, and the other end of the first hydraulic cylinder II-3 is connected to the horizontal leg telescopic arm II-1.

[0067] The horizontal leg telescopic arm II-1 is nested in the horizontal leg main arm II-4, and the horizontal leg telescopic arm II-1 can slide in the horizontal leg main arm II-4.

[0068] One end of the horizontal leg telescopic arm II-1 away from the horizontal leg main arm II-4 is hinged to the vertical leg II-9.

[0069] The horizontal leg telescopic arm II-1 is hinged to the first dead point rod II-6, the vertical leg II-9 is hinged to the second dead point rod II-7, and the first dead point rod II-6 is hinged to the second dead point rod II-7.

[0070] One end of the second hydraulic cylinder II-2 is hinged to the horizontal leg telescopic arm II-1, and the other end of the second hydraulic cylinder II-2 is hinged to one end of the first dead point rod II-6 away from the horizontal leg telescopic arm II-1.

[0071] One end of the horizontal leg main arm II-4 away from the vertical leg II-9 is arranged on the aerial work platform carrier mechanism I.

[0072] When the foldable support leg is in the folded state, the first dead point rod II-6 and the second hydraulic cylinder II-2 are retracted in the internal hollow structure of the horizontal leg telescopic arm II-1, the internal hollow structure is provided with a reinforcing rib; the second dead point rod II-7 is retracted in the internal hollow structure of the vertical leg II-9, the internal hollow structure is also provided with a reinforcing rib, and the vertical leg II-9 and the horizontal leg telescopic arm II-1 are retracted in the horizontal leg main arm II-4.

[0073] As Figure 2 One end of the horizontal leg telescopic arm II-1 is hinged to the vertical leg II-9 through a pin shaft, the middle part of the horizontal leg telescopic arm II-1 is hinged to the second hydraulic cylinder II-2 and the first dead point rod II-6 through pin shafts respectively, and the connecting section view is as shown in Figure 3 .

[0074] The first hydraulic cylinder II-3 is fixedly connected to the horizontal leg telescopic arm II-1 and the horizontal leg main arm II-4 through pin shafts at both ends, the horizontal leg telescopic arm II-1 is nested in the horizontal leg main arm II-4, and relative movement between the two can be realized through telescopic extension of the first hydraulic cylinder II-3.

[0075] The inner side of the protective cover II-5 is nested with the outer side of the horizontal leg main arm II-4, and the nested installation can be achieved, and the specific connection is as shown in Figure 4 .

[0076] The second dead point rod II-7 is hingedly connected to the first dead point rod II-6 and the vertical leg II-9 through pin shafts at both ends, respectively, the vertical leg II-9 is welded to the foot support II-8 at the bottom, and the second dead point rod II-7 has hinged holes at both ends.

[0077] The first hydraulic cylinder II-3 and the second hydraulic cylinder II-2 are connected to the hydraulic pump of the aerial work platform.

[0078] The horizontal leg telescopic arm II-1 and the vertical leg II-9 both have a hollow structure inside, and reinforcing ribs are used to improve the mechanical properties.

[0079] The material of the foldable support leg is high-strength low-carbon steel, and bs700 is used in the embodiment.

[0080] The working process of the foldable support leg in the embodiment is briefly described as follows:

[0081] When not working, the foldable support leg is in the retracted state, the second hydraulic cylinder II-2 and the first dead point rod II-6 are in the hollow structure inside the horizontal leg telescopic arm II-1, the second dead point rod II-7 is in the hollow structure inside the vertical leg II-9, the vertical leg II-9 is parallel to the horizontal leg telescopic arm II-1, and the vertical leg II-9 and the horizontal leg telescopic arm II-1 are jointly retracted inside the horizontal leg main arm II-4.

[0082] After the aerial work platform reaches the specified position, the horizontal leg telescopic arm II-1 slides out from inside the horizontal leg main arm II-4 under the elongation of the first hydraulic cylinder II-3, and then the vertical leg II-9 is perpendicular to the horizontal leg telescopic arm II-1 under the elongation of the second hydraulic cylinder II-2, at this time, the first dead point rod II-6 is out of the hollow structure inside the horizontal leg telescopic arm II-1, the second dead point rod II-7 is out of the hollow structure inside the vertical leg II-9, the foot support II-8 is in contact with the ground, and the aerial work platform is stable on the ground.

[0083] The foldable support leg is retracted according to the original process, and the process is as shown in Figure 8 .

[0084] Embodiment 2

[0085] The embodiment describes a high-altitude operation vehicle, which is equipped with the foldable support leg II in embodiment 1, and the foldable support leg II is X-shaped welded on the carrier mechanism I to reduce the width of the vehicle.

[0086] The high-altitude operation vehicle of the embodiment further comprises a carrier mechanism I, a rotating mechanism III, an arm support mechanism IV, and a working platform V, as shown in Figure 9 and Figure 10 .

[0087] As shown in Figure 11 and Figure 12 , the carrier mechanism I comprises a cab I-1, a frame I-2, a mounting chassis I-3, an oil tank I-4, and a hydraulic pump I-5. The cab I-1 is located at the front end of the carrier mechanism I, and the inside is arranged with a driving platform, a seat, a temperature adjusting device, etc. The frame I-2 is located behind the cab I-1, and the mounting chassis I-3 is installed on the top of the frame I-2. The mounting chassis I-3 can realize the connection of the carrier system and the working system. The mounting chassis I-3 can be designed individually for different needs. The oil tank I-4 and the hydraulic pump I-5 are fixedly connected with the frame I-2 at the bottom of the vehicle.

[0088] As shown in Figure 13 , Figure 14 , the rotating mechanism III comprises a rotating box body III-1, a rotating support bearing III-2, a rotating forward pinion III-3, a connecting rod III-4, a rotating reducer III-5, a hydraulic motor buckle III-6, a hydraulic motor III-7, and a hydraulic motor base III-8. The hydraulic motor buckle III-6 cooperates with the hydraulic motor base III-8 to fix the hydraulic motor III-7.

[0089] The output shaft of the hydraulic motor III-7 is connected with the rotating reducer III-5. One end of the connecting rod III-4 is key-connected with the rotating reducer III-5, and the other end is key-connected with the rotating forward pinion III-3. The inner ring of the rotating support bearing III-2 is welded with a circular rack. The gear ring of the rotating forward pinion III-3 is engaged with the rack of the inner ring of the rotating support bearing III-2. The outer ring of the rotating support bearing III-2 is connected with the rotating box body III-1 through bolts. The lower end of the rotating box body III-1 has bolt holes, which are connected and fixed with the carrier mechanism I through bolts.

[0090] The outer ring of the rotating support bearing III-2 is fixed. The inner ring of the rotating support bearing III-2 is connected with the arm support base IV-6 through bolts. When the power of the hydraulic motor III-7 drives the rotating forward pinion III-3 to rotate, the inner ring of the rotating support bearing III-2 engaged with the rotating forward pinion III-3 rotates, thereby driving the arm support mechanism IV above to rotate.

[0091] As shown in Figure 15As shown, the boom mechanism IV includes a main boom IV-1, a small hydraulic cylinder IV-2, a telescopic boom IV-3, a flying boom IV-4, a large hydraulic cylinder IV-5, and a boom base IV-6. The upper end of the boom base IV-6 is hinged to the main boom IV-1, and both ends of the small hydraulic cylinder IV-2 are hinged to the middle of the boom base IV-6 and the middle of the main boom IV-1, respectively.

[0092] One end of the boom's large hydraulic cylinder IV-5 is hinged to the transport mechanism I, and the other end is hinged to the main boom IV-1. Each telescopic boom section of the boom telescopic boom IV-3 is nested together, extending and retracting with the aid of internal slide rails provided by hydraulic cylinders. The boom telescopic boom IV-3 and the main boom IV-1 are also nested together and extend and retract with the aid of slide rails via hydraulic cylinders. The boom IV-4 is hinged to the top of the boom telescopic boom IV-3.

[0093] The boom mechanism IV is made of high-strength low-carbon steel, and in this embodiment, BS700 is used.

[0094] This embodiment designs the appearance and lightweight materials of the work platform V. The work platform V is made of carbon fiber material. By making reasonable use of the high tensile strength of carbon fiber according to the weaving method, the tensile strength of the work platform V is not only improved, but also the lightweight of the aerial work vehicle is achieved.

[0095] This aerial work platform also includes sensors and a control unit, with the sensors connected to the control unit.

[0096] The following section performs a mechanical analysis of the aerial work platform at extreme positions to determine the sensor installation location, specifically as follows: Figure 16 As shown, and simplified as follows: Figure 17 As shown, calculations are performed after force analysis; the force analysis of the foldable support leg is as follows. Figure 18 As shown.

[0097] The structure is calculated through stress analysis, and the degrees of freedom are calculated according to formula (1):

[0098] F = 3n - (2P) L -P H -P')-F' (1)

[0099] Where n is the number of active components, P L For low-order numbers, P H P' is the higher degree of freedom, F' is the virtual constraint number, and F' is the local degree of freedom. The calculation and analysis are performed based on the geometric relationships of the foldable support leg, boom mechanism, and other structures, using formulas (2)-(5).

[0100] Formula for the side length of a triangle:

[0101]

[0102] Equation of balance of plane arbitrary force system:

[0103] ∑F x = 0 (3)

[0104] ∑F y = 0 (4)

[0105] ∑M0(F) = 0 (5)

[0106] In the formula, F x is the force in the X direction, F y is the force in the Y direction, and M0 is the moment;

[0107] The vertical leg with the maximum support reaction force is found by calculating the support reaction force of the foldable support leg, and the maximum stress position of the vertical leg is calculated by strength analysis. The maximum position is the connection position of the second dead point rod II-7 and the vertical leg II-9. This position is designed to be hollow to accommodate the second dead point rod II-7 and achieve lightweight. Therefore, a stress sensor is placed at this position.

[0108] A position sensor is placed at the connection position of the vertical leg II-9 and the horizontal leg telescopic arm II-1 to monitor the extension length of the horizontal leg telescopic arm II-1 of the foldable support leg in real time. Since the horizontal leg telescopic arm II-1 at this connection position is subjected to the support reaction force of the vertical leg II-9, a stress sensor should also be placed at this position.

[0109] As Figure 17 shown, the support reaction force calculation formula of the foldable support leg is:

[0110]

[0111] M = G3Lcosθ (10)

[0112] Wherein, G1 is the gravity of the slewing part of the aerial work platform (N); G2 is the gravity of the non-slewing part (N); θ is the directional angle between the slewing center of the working device and the telescopic arm frame (°); R a , R b , R c , R d are the support reaction forces at the right front support leg, the left front support leg, the left rear support leg, and the right rear support leg, respectively (N); e1 and e2 are eccentric distances (m); a is the width of the leg landing position and the gravity center of the slewing platform (m); b is the total length of half of the aerial work platform (m); M is the bending moment of the slewing part of the aerial work platform on the slewing center of the working device (N·m); L is the arm frame length; and G3 is the gravity of the working platform (N).

[0113] Strength analysis of vertical leg II-9:

[0114]

[0115] wherein, σ max is the maximum normal stress (N) ; R max is R a , R b , R c , R d is the maximum support reaction force (N) ; A1 is the effective cross-sectional area of the vertical leg II-9 (m 2 ).

[0116] As Figure 19 , Figure 20 , Figure 21 indicated, the strength and rigidity of the horizontal leg telescopic arm II-1 and the horizontal leg main arm II-4 in the elongated state are analyzed:

[0117] I z =∫ A ydA (12)

[0118] M max = R max L1 (13)

[0119]

[0120] wherein, M max is the maximum bending moment (N·m) of the horizontal leg telescopic arm II-1 or the horizontal leg main arm II-4 in the elongated state; σ is the normal stress (N) ; I is the moment of inertia; and L1 is the total length of the horizontal leg telescopic arm II-1 or the horizontal leg main arm II-4 in the elongated state (m).

[0121]

[0122] wherein, F Q1 is the shear force (N) of the horizontal leg telescopic arm or the horizontal leg main arm in the elongated state; and A2 is the shear area (m 2 ) of the horizontal leg telescopic arm or the horizontal leg main arm in the elongated state.

[0123] The total length of the horizontal leg telescopic arm and the horizontal leg main arm in the elongated state is mechanically simplified as a cantilever beam, the maximum bending moment is at the maximum distance from the vertical leg II-9, and according to the shear stress calculation formula, the cross-sectional area of the horizontal leg telescopic arm II-1 is about half of that of the horizontal leg main arm II-4, so the shear stress at the outermost position of the horizontal leg main arm II-4 is the largest, and a stress sensor is placed at this position, as Figure 22 indicated.

[0124] The aerial work platform in the embodiment further has a sensor arranged on the boom mechanism IV, and the sensor is connected to the control unit to monitor the working condition of the boom mechanism IV in real time.

[0125] Considering that the material of the foldable support leg II and the jib mechanism IV is low carbon steel, the fourth strength theory formula is used for calculation:

[0126]

[0127] Wherein, σ1, σ2, σ3 represent three principal stresses of the point, σ r4 is the fatigue limit of the fourth strength theory

[0128] The calculated stress σ r4 of the foldable support leg II and the jib mechanism IV is compared with the yield strength σ y of the material: σ r4＜＜ σ y Since the stress σ r4 is far less than the yield strength σ y , the design requirement is met.

[0129] After the mechanical analysis of the aerial work platform, the sensor is installed at the extreme position, and the sensor placement position is shown in Figure 22 .

[0130] The power source uses the chassis engine to transmit power to the hydraulic pump I-5 through the power output. The hydraulic oil is sucked into the oil pump from the oil tank through the coarse filter, and then the pressure oil output by the hydraulic pump I-5 is delivered to the working circuit through the fine filter. The action of the working device, such as the extension and contraction of the support leg, the rotation of the jib mechanism, and the rotation of the slewing mechanism, is controlled by the corresponding hydraulic working device through the corresponding reversing valve.

[0131] The computer display screen of the cab I-1 can reflect the information of the aerial work platform in real time. Since it is not convenient for the construction personnel to communicate with the operator due to the long distance during aerial work, the construction personnel can accurately reach the construction site for work through the wireless handle.

[0132] The working process of the aerial work platform is as follows: after the aerial work platform is driven to the designated position by the carrying mechanism I, the cross leg extension arm II-1 of the foldable support leg II is first elongated, and then the second hydraulic cylinder II-2 is elongated to drive the vertical leg II-9, so that the foot support II-8 is grounded to complete the supporting process; the slewing mechanism III is horizontally rotated under the power output of the hydraulic motor III-7, the jib small hydraulic cylinder IV-2 and the jib large hydraulic cylinder IV-5 are extended and contracted to adjust the inclination angle, the jib extension arm IV-3 is elongated, and after the jib extension arm IV-3 is elongated to the designated position, the jib IV-4 is adjusted in position by the hydraulic cylinder, the working platform V is adjusted in all directions with small amplitude under the output power of the hydraulic motor III-7, and when stopping working, it can be retracted in the original way.

[0133] The various sensors in the embodiment are all connected to the control unit, and during the working of the aerial work platform, the stress, bending moment, temperature and various sensors are used for sensing, the signals are converted to collect information and processed by the chip, the data working conditions are analyzed by the automatic identification module of the control unit, and the energy, geometry, mechanical properties and various conditions are monitored in real time; the real-time monitoring result and the detection result can be viewed on the computer screen, if an abnormality occurs, such as energy overrun, sensor threshold abnormality, etc., the corresponding alarm function of the control unit will be triggered, and corresponding control measures will be taken, such as controller emergency stop or self-adjustment. At the same time, the background will summarize, analyze, calculate and score the data, etc., which can realize the functions of performance optimization, fault diagnosis, etc., and can also generate logs and provide personalized reminders, and comprehensively guarantee the stable operation and efficient management of the equipment.

[0134] The embodiments of the utility model are used to illustrate the technical scheme of the utility model and not to limit, for the ordinary skilled in the art, can understand that these embodiments can be changed, modified, replaced and changed in various ways without departing from the principles and spirits of the utility model, the range of the utility model is defined by the appended claims and its equivalents.

Claims

1. A foldable support leg characterized by: The horizontal leg main arm, the horizontal leg telescopic arm, the first hydraulic cylinder, the second hydraulic cylinder and the vertical leg are included. One end of the first hydraulic cylinder is connected to the horizontal leg main arm, and the other end of the first hydraulic cylinder is connected to the horizontal leg telescopic arm. The horizontal leg telescopic arm is nested in the horizontal leg main arm and can slide in the horizontal leg main arm. The vertical leg is hinged to one end of the horizontal leg telescopic arm away from the horizontal leg main arm. The first dead point rod is hinged to the horizontal leg telescopic arm, and the second dead point rod is hinged to the vertical leg. The first dead point rod is hinged to the second dead point rod. One end of the second hydraulic cylinder is hinged to the horizontal leg telescopic arm, and the other end of the second hydraulic cylinder is hinged to one end of the first dead point rod away from the horizontal leg telescopic arm. The horizontal leg main arm away from the vertical leg is arranged on the aerial work platform carrier mechanism.

2. A foldable support leg according to claim 1, wherein: When the support leg is in the folded state, the first dead point rod and the second hydraulic cylinder are retracted in the internal hollow structure of the horizontal leg telescopic arm, the second dead point rod is retracted in the internal hollow structure of the vertical leg, and the vertical leg and the horizontal leg telescopic arm are retracted in the horizontal leg main arm.

3. A foldable support leg according to claim 1, wherein: It also includes a foot support arranged at one end of the vertical leg in contact with the ground.

4. The foldable support leg of claim 1, wherein: It also includes a protective cover arranged outside one end of the horizontal leg main arm away from the vertical leg.

5. The foldable support leg of claim 1, wherein: The first hydraulic cylinder and the second hydraulic cylinder are connected to the hydraulic pump.

6. A foldable support leg according to claim 1, wherein: Reinforcing ribs are arranged in the internal hollow structure of the horizontal leg telescopic arm and the internal hollow structure of the vertical leg.

7. An aerial device, comprising: The material of the foldable support leg is high-strength low-carbon steel.

8. The aerial device of claim 7, wherein: The aerial work platform is provided with the foldable support leg according to any one of claims 1 to 6. The aerial work platform is provided with a carrier mechanism, a slewing mechanism, an arm mechanism and a working platform on the carrier mechanism. The foldable support leg is arranged in an X shape on the carrier mechanism.

9. A high altitude vehicle according to claim 8, characterized in that: One end of the arm mechanism is connected to the slewing mechanism, and the other end of the arm mechanism is connected to the working platform. The aerial work platform is provided with a sensor and a control unit.

10. The aerial device of claim 9, wherein: The sensor is arranged on the foldable support leg and the arm mechanism, and is connected to the control unit. The sensor includes a stress sensor, a position sensor, a bending moment sensor and an angle sensor.

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