阅读说明：本技术 一种用于车辆越障的伸缩臂装置 (Telescopic arm device for vehicle obstacle crossing ) 是由 肖洁 宋慧新 段国柱 陈宇 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种用于车辆越障的伸缩臂装置,包括：外臂总成、一级内臂总成、二级内臂总成和驱动油缸；所述一级内臂总成可伸缩连接在外臂总成中,且一级内臂总成相对外臂总成伸缩到设定位置后通过限位销Ⅰ限位；二级内臂总成可伸缩连接在一级内臂总成中,且二级内臂总成相对一级内臂总成伸缩到设定位置后通过限位销Ⅱ限位；所述外臂总成和二级内臂总成之间设有两个驱动油缸,每个驱动油缸的缸体端支撑在外臂总成的外表面上,活塞杆端支撑在二级内臂总成的末端外表面上,驱动油缸用于驱动一级内臂总成和二级内臂总成伸缩运动。(The invention discloses a telescopic arm device for vehicle obstacle crossing, which comprises: the device comprises an outer arm assembly, a primary inner arm assembly, a secondary inner arm assembly and a driving oil cylinder; the primary inner arm assembly is telescopically connected in the outer arm assembly, and the primary inner arm assembly is limited by a limiting pin I after being stretched to a set position relative to the outer arm assembly; the second-stage inner arm assembly is connected in the first-stage inner arm assembly in a telescopic mode, stretches to a set position relative to the first-stage inner arm assembly and then is limited through a limiting pin II; two driving oil cylinders are arranged between the outer arm assembly and the second-stage inner arm assembly, the cylinder body end of each driving oil cylinder is supported on the outer surface of the outer arm assembly, the piston rod end is supported on the outer surface of the tail end of the second-stage inner arm assembly, and the driving oil cylinders are used for driving the first-stage inner arm assembly and the second-stage inner arm assembly to move in a stretching mode.)

1. A telescopic arm device for vehicle obstacle crossing, comprising: the device comprises an outer arm assembly (1), a primary inner arm assembly (2), a secondary inner arm assembly (3) and a driving oil cylinder (4);

the primary inner arm assembly (2) is telescopically connected into the outer arm assembly (1), and the primary inner arm assembly (2) is limited by a limiting pin I (103) after being stretched to a set position relative to the outer arm assembly (1); the secondary inner arm assembly (3) is telescopically connected in the primary inner arm assembly (2), and the secondary inner arm assembly (3) is limited by a limiting pin II (204) after being stretched to a set position relative to the primary inner arm assembly (2);

two driving oil cylinders (4) are arranged between the outer arm assembly (1) and the second-stage inner arm assembly (3), the cylinder body end of each driving oil cylinder (4) is supported on the outer surface of the outer arm assembly (1), the piston rod end is supported on the outer surface of the tail end of the second-stage inner arm assembly (3), and the driving oil cylinders (4) are used for driving the first-stage inner arm assembly (2) and the second-stage inner arm assembly (3) to do telescopic motion.

2. The telescopic arm apparatus for a vehicle obstacle crossing according to claim 1, further comprising: and the stay wire displacement sensor (5) is connected between the piston rod of the driving oil cylinder (4) and the cylinder body and is used for measuring the displacement of the telescopic motion of the driving oil cylinder (4).

3. The telescopic arm device for vehicle obstacle crossing according to claim 1, wherein a sliding body or a rolling body is respectively installed between the outer arm assembly (1) and the primary inner arm assembly (2) and between the primary inner arm assembly (2) and the secondary inner arm assembly (3) for realizing telescopic motion therebetween.

4. The telescopic arm device for vehicle obstacle crossing according to claim 1, wherein the main structures of the outer arm assembly (1), the primary inner arm assembly (2) and the secondary inner arm assembly (3) are all rectangular frame structures formed by splicing plates.

5. Telescopic arm device for vehicle obstacle crossing according to any of claims 1-4, characterized in that the outer arm assembly (1) comprises: the spline shaft mounting structure comprises an upper plate I (101), an inner side plate I (102), a lower plate I (104), an outer side plate I (106), a spline shaft mounting seat (107) and an outer cylinder mounting seat (109);

the structure of the upper plate I (101) is the same as that of the lower plate I (104), strip-shaped grooves I (108) extending along the longitudinal direction are designed on two transverse sides of the upper plate I, the inner side plate I (102) and the outer side plate I (106) are inserted into the strip-shaped grooves I (108) of the upper plate I (101) and the lower plate I (104), and the matching parts are mutually occluded and restrained and fixed through fastening bolts (105);

a circular hole (110) is formed in one longitudinal end of the inner side plate I (102), and the circular hole (110) is used for installing a spline shaft, a cable and a pipeline; one end of the outer side plate I (106), which corresponds to the circular hole (110) in the inner side plate I (102), is provided with a rectangular hole (111) which is used as a positioning welding hole of the spline shaft mounting seat (107);

the longitudinal other ends of the inner side plate I (102) and the outer side plate I (106) are respectively provided with a limiting pin hole, the primary inner arm assembly (2) stretches to a set position relative to the outer arm assembly (1), and the primary inner arm assembly (2) is limited by inserting a limiting pin I (103) into the limiting pin I hole;

two outer cylinder mounting seats (109) are symmetrically welded on the upper plate I (101) and the lower plate I (104) and used for mounting cylinder bodies of two driving oil cylinders (4).

6. Telescopic arm device for vehicle obstacle surmounting according to any of claims 1-4, characterized in that said primary inner arm assembly (2) comprises: the sliding plate comprises a wear-resistant sliding plate I (201), an upper plate II (202), a lower plate II (205), an outer side plate II (206) and an inner side plate II (208);

the outer side plate II (206) and the inner side plate II (208) are identical in structure, the back surfaces of the outer side plate II and the inner side plate II and the back surfaces of the upper plate II (202) and the lower plate II (205) are respectively provided with a wear-resistant sliding plate I (201), and the wear-resistant sliding plate I (201) is in sliding fit with the corresponding position of the inner wall surface of the outer arm assembly (1);

limiting grooves I (212) are respectively arranged at corresponding positions on two transverse sides of the wear-resistant sliding plate I (201) on the outer side plate II (206) and the inner side plate II (208), are used as sliding rails of the first-stage inner arm assembly (2), and are in sliding fit with the limiting pin I (103);

and strip-shaped grooves II 213 are designed on the two transverse sides of the opposite surfaces of the outer side plate II (206) and the inner side plate II (208) and are used for restraining and positioning the upper plate II (202) and the lower plate II (205).

7. The telescopic arm device for vehicle obstacle crossing according to claim 6, wherein two hoops I (203) are sleeved on a rectangular frame formed by the upper plate II (202), the lower plate II (205), the outer plate II (206) and the inner plate II (208).

8. The telescopic arm device for vehicle obstacle crossing as claimed in claim 6, wherein a secondary inner arm limiting block (207) is welded on the outer side plate II (206) and the inner side plate II (208) respectively, and is used for limiting the retraction stroke of the secondary inner arm assembly (3).

9. Telescopic arm device for vehicle obstacle surmounting, according to claim 6, characterized in that said secondary inner arm assembly (3) comprises: the wear-resistant sliding plate II (301), the upper plate III (302), the inner side plate III (303), the outer side plate III (304), the lower plate III (305), the hoop II (306) and the inner cylinder mounting seat (307);

the upper plate III (302), the inner side plate III (303), the outer side plate III (304) and the lower plate III (305) are connected to form a cuboid frame, wear-resistant sliding plates II (301) are mounted on the four outer surfaces of the cuboid frame, and two hoop II (306) are sleeved on the cuboid frame;

and a motor shaft mounting seat 308 is integrally processed at one end part of the inner side plate III (303) extending out from the primary inner arm assembly (2), and two inner cylinder mounting seats (307) are symmetrically welded on the upper end surface and the lower end surface of the motor shaft mounting seat 308.

10. The telescopic arm device for vehicle obstacle crossing according to claim 9, wherein the wear-resistant sliding plate I (201) and the wear-resistant sliding plate II (301) are both made of nylon material.

Technical Field

The invention relates to the technical field of vehicle suspensions, in particular to a telescopic arm device for vehicle obstacle crossing.

Background

For off-road vehicles, it is important to switch the suspension among various forms to adapt to different terrains and to climb over complex obstacles under various bad road conditions. Meanwhile, the vehicle can realize posture adjustment in a wider range, further improve the terrain adaptation and obstacle crossing capability of the vehicle, and also realize the functions of preventing roadside simple explosives and reducing damage of a thunder area by improving the ground height. On the other hand, when the vehicle runs off-road at high speed and is out of the way, large impact loads exist, and although the loads are damped by the buffering and energy absorption of the buffering structure, the local overload is still possible. In summary, it is necessary to develop a device capable of adjusting the height of the suspension with a large stroke, and having high strength performance of strong impact resistance and large torque.

Therefore, a telescopic arm device for vehicle obstacle crossing is provided to improve the high trafficability of the vehicle and the adaptability to the multi-state road surface.

Disclosure of Invention

In view of the above, the invention provides a telescopic arm device for vehicle obstacle crossing, which can realize large-range adjustment of the height of a suspension from the ground, meet the strength requirements required by large impact force and large circumferential torque, ensure high passing performance of a vehicle, and further improve the terrain adaptation and obstacle crossing capability of the vehicle.

The technical scheme of the invention is as follows: a telescopic arm arrangement for vehicle obstacle crossing, comprising: the device comprises an outer arm assembly, a primary inner arm assembly, a secondary inner arm assembly and a driving oil cylinder;

the primary inner arm assembly is telescopically connected in the outer arm assembly, and the primary inner arm assembly is limited by a limiting pin I after being stretched to a set position relative to the outer arm assembly; the second-stage inner arm assembly is connected in the first-stage inner arm assembly in a telescopic mode, stretches to a set position relative to the first-stage inner arm assembly and then is limited through a limiting pin II;

two driving oil cylinders are arranged between the outer arm assembly and the second-stage inner arm assembly, the cylinder body end of each driving oil cylinder is supported on the outer surface of the outer arm assembly, the piston rod end is supported on the outer surface of the tail end of the second-stage inner arm assembly, and the driving oil cylinders are used for driving the first-stage inner arm assembly and the second-stage inner arm assembly to move in a stretching mode.

Preferably, the method further comprises the following steps: and the stay wire displacement sensor is connected between a piston rod of the driving oil cylinder and the cylinder body and is used for measuring the displacement of the driving oil cylinder in the telescopic motion.

Preferably, a sliding body or a rolling body is respectively arranged between the outer arm assembly and the first-stage inner arm assembly and between the first-stage inner arm assembly and the second-stage inner arm assembly, so as to realize telescopic motion among the outer arm assembly, the first-stage inner arm assembly, the second-stage inner arm assembly and the third-stage inner arm assembly.

Preferably, the main body structures of the outer arm assembly, the primary inner arm assembly and the secondary inner arm assembly are all rectangular frame structures formed by splicing plates.

Preferably, the outer arm assembly comprises: the spline shaft mounting device comprises an upper plate I, an inner side plate I, a lower plate I, an outer side plate I, a spline shaft mounting seat and an outer cylinder mounting seat;

the upper plate I and the lower plate I are identical in structure, strip-shaped grooves I extending along the longitudinal direction are formed in the two transverse sides of the upper plate I, the inner side plate I and the outer side plate I are inserted into the strip-shaped grooves I of the upper plate I and the lower plate I, the matching parts are mutually occluded and restrained, and the upper plate I and the lower plate I are fixed through fastening bolts;

a circular hole is formed in one longitudinal end of the inner side plate I and used for installing a spline shaft, a cable and a pipeline; one end of the outer side plate I, which corresponds to the circular hole in the inner side plate I, is provided with a rectangular hole which is used as a positioning welding hole of the spline shaft mounting seat;

the longitudinal other ends of the inner side plate I and the outer side plate I are respectively provided with a limiting pin hole, the primary inner arm assembly stretches to a set position relative to the outer arm assembly, and the primary inner arm assembly is limited by inserting a limiting pin I into the limiting pin I hole;

two outer jar mount pads symmetry welds on upper plate I and hypoplastron I for install two drive cylinder's cylinder body.

Preferably, the primary inner arm assembly comprises: the wear-resistant sliding plate comprises a wear-resistant sliding plate I, an upper plate II, a lower plate II, an outer side plate II and an inner side plate II;

the outer side plate II and the inner side plate II are identical in structure, the horizontal middle parts of the back surfaces of the outer side plate II and the inner side plate II and the horizontal middle parts of the back surfaces of the upper plate II and the lower plate II are respectively provided with a wear-resistant sliding plate I, and the wear-resistant sliding plate I is in sliding fit with the corresponding position of the inner wall surface of the outer arm assembly;

limiting grooves I are respectively arranged at corresponding positions on two transverse sides of the wear-resistant sliding plate I on the outer side plate II and the inner side plate II, are used as sliding tracks of the first-stage inner arm assembly and are in sliding fit with the limiting pins I;

and strip-shaped grooves II 213 are arranged on the two transverse sides of the opposite surfaces of the outer side plate II and the inner side plate II and used for restraining and positioning the upper plate II and the lower plate II.

Preferably, the cuboid frame that upper plate II, hypoplastron II, outer panel II and interior plate II formed is overlapped and is equipped with two staple bolts I.

Preferably, the outer side plate II and the inner side plate II are respectively welded with a second-stage inner arm limiting block for limiting the retraction stroke of the second-stage inner arm assembly.

Preferably, the secondary inner arm assembly comprises: the wear-resistant sliding plate II, the upper plate III, the inner side plate III, the outer side plate III, the lower plate III, the hoop II and the inner cylinder mounting seat;

the upper plate III, the inner side plate III, the outer side plate III and the lower plate III are connected to form a cuboid frame, wear-resistant sliding plates II are mounted on the four outer surfaces of the cuboid frame, and two anchor ears II are sleeved on the cuboid frame;

and a motor shaft mounting seat 308 is integrally processed at one end part of the inner side plate III extending out of the primary inner arm assembly, and the two inner cylinder mounting seats are symmetrically welded on the upper end surface and the lower end surface of the motor shaft mounting seat 308.

Preferably, the wear-resisting slide plate I and the wear-resisting slide plate II are both made of nylon materials.

Has the advantages that:

1. according to the telescopic arm device, the telescopic mode of the telescopic arm device can be changed into one-stage telescopic mode or multi-stage telescopic mode according to the arm length and the telescopic stroke requirement, and large-stroke telescopic mode can be realized, so that the large-range adjustment of the distance height of the suspension frame to the ground is realized; meanwhile, the large coincidence area between the outer arm assembly and the one-stage inner arm assembly and between the two-stage inner arm assemblies during the maximum extension stroke is ensured, the large-torque bearing can be realized, the telescopic arm device is ensured to have high-strength performance of strong impact resistance and large torque, the change of various structures and forms of the platform is further realized, and the terrain adaptability and obstacle crossing capability of the vehicle are greatly improved.

2. The telescopic arm device measures the telescopic movement displacement of the telescopic arm device through the stay wire displacement sensor, and is favorable for accurately controlling the telescopic stroke of the telescopic arm device.

3. The main body structures of the telescopic arm device are all designed into cuboid frame structures, so that the integral torque of the telescopic arm device is increased, and the integral strength of the structure is improved.

4. The specific design of the outer arm assembly can be effectively matched with the first-stage inner arm assembly, and can also provide a mounting base for the external arrangement of the driving oil cylinder, so that enough pipeline cable space can be reserved in the telescopic arm device, and the telescopic arm pipeline can not be bent and can be automatically recovered; and the main structure of the outer arm assembly is fastened by high-strength fastening bolts to form a whole, so that the inner arm and the outer arm are convenient to mount, dismount and maintain.

5. The specific design of the first-stage inner arm assembly is beneficial to realizing accurate telescopic motion by sliding fit with the outer arm assembly, and can also ensure that the first-stage inner arm assembly is accurately matched with the second-stage inner arm assembly in a sliding manner to realize telescopic motion.

6. The anchor ear structure is designed on the main structure of the two-stage inner arm assembly, so that the maximum stress deformation part of the inner arm is reinforced, and the bearing capacity of the telescopic arm device is ensured when the telescopic arm device is fully stretched.

7. According to the invention, two driving oil cylinders are adopted to control the telescopic arm, so that interchangeability and universality can be increased, and adverse effects of unbalanced lateral force can be improved.

Drawings

Fig. 1 is a schematic structural diagram of a telescopic arm device according to the present invention.

FIG. 2 is a schematic structural view of the outer arm assembly of the present invention.

Fig. 3 is a schematic structural view of the upper plate (lower plate) in the outer arm assembly.

FIG. 4 is a schematic view of the inner side plate of the outer arm assembly.

Fig. 5 is a schematic structural view of an outer side plate in the outer arm assembly.

FIG. 6 is a schematic structural view of a primary inner arm assembly according to the present invention.

Fig. 7 is a front view of the inner side plate (outer side plate) of the primary inner arm assembly.

FIG. 8 is a schematic view of the back side of the inner side plate (outer side plate) of the primary inner arm assembly.

FIG. 9 is a schematic structural diagram of a secondary inner arm assembly according to the present invention.

FIG. 10 is a schematic view of the inner side plate of the secondary inner arm assembly.

Fig. 11 is a schematic view of the retraction stroke of the telescopic arm device of the present invention.

Fig. 12 is a schematic drawing of the extension stroke of the telescopic arm device of the present invention.

Wherein, 1-outer arm assembly, 2-first-stage inner arm assembly, 3-second-stage inner arm assembly, 4-driving oil cylinder, 5-stay wire displacement sensor, 6-oil cylinder pin shaft, 101-upper plate I, 102-inner side plate I, 103-limit pin I, 104-lower plate I, 105-fastening bolt, 106-outer side plate I, 107-spline shaft mounting seat, 108-strip groove I, 109-outer cylinder mounting seat, 110-circular hole, 111-rectangular hole, 201-wear-resistant sliding plate I, 202-upper plate II, 203-hoop I, 204-limit pin II, 205-lower plate II, 206-outer side plate II, 207-second-stage inner arm limit block, 208-inner side plate II, 209-limit pin mounting hole, 210-mounting groove, 211-threaded hole, 212-limiting groove I, 213-strip groove II, 301-wear-resistant sliding plate II, 302-upper plate III, 303-inner plate III, 304-outer plate III, 305-lower plate III, 306-hoop II, 307-inner cylinder mounting seat and 308-motor shaft mounting seat.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

The embodiment provides a telescopic arm device for vehicle hinders more, can realize the suspension apart from the adjustment on a large scale of ground height, satisfy the required intensity requirement of big impulsive force, big circumference moment of torsion simultaneously, guaranteed the high trafficability characteristic of vehicle, and then improved the vehicle adaptation topography and the ability of hindering more.

As shown in fig. 1, the telescopic arm apparatus includes: the device comprises an outer arm assembly 1, a primary inner arm assembly 2, a secondary inner arm assembly 3, a driving oil cylinder 4, a stay wire displacement sensor 5 and an oil cylinder pin shaft 6;

the outer arm assembly 1 is used as a supporting part of the telescopic arm device, the primary inner arm assembly 2 is telescopically connected in the outer arm assembly 1 and used as a primary telescopic arm unit, and the primary inner arm assembly 2 can be limited by a limiting pin I103 after being stretched to a set position relative to the outer arm assembly 1; the second-stage inner arm assembly 3 is telescopically connected in the first-stage inner arm assembly 2 to serve as a second-stage telescopic arm unit, and the second-stage inner arm assembly 3 can be limited by a limiting pin II 204 after being stretched to a set position relative to the first-stage inner arm assembly 2;

the cylinder body end of the driving oil cylinder 4 is supported on the outer surface of the outer arm assembly 1 through an oil cylinder pin shaft 6, the piston rod end is supported on the outer surface of the tail end (the end extending out of the first-stage inner arm assembly 2) of the second-stage inner arm assembly 3, and the driving oil cylinder 4 is used for driving the two-stage telescopic arm units to perform telescopic motion;

one end of a stay wire displacement sensor 5 is connected to a piston rod of the driving oil cylinder 4, and the other end of the stay wire displacement sensor is connected to a cylinder body of the driving oil cylinder 4, is used for measuring the displacement of the telescopic motion of the driving oil cylinder 4 and feeds back the displacement to an external controller; the stay wire displacement sensor 5 is a magnetic resistance type displacement sensor, and has good waterproof performance.

In this embodiment, a sliding body or a rolling body is respectively installed between the outer arm assembly 1 and the first-stage inner arm assembly 2, and between the first-stage inner arm assembly 2 and the second-stage inner arm assembly 3, so as to adapt to the telescopic motion between the three.

In this embodiment, outer arm assembly 1, one-level inner arm assembly 2 and 3 major structures of second grade inner arm assembly are the cuboid frame construction that the panel concatenation formed, and the cuboid shape is favorable to increasing the moment of torsion, increases structural strength, forms through the panel concatenation and has guaranteed that outer arm assembly 1, one-level inner arm assembly 2 and second grade inner arm assembly 3 are suitable for processing, with low costs, processing cycle is short.

In this embodiment, as shown in fig. 2, the outer arm assembly 1 includes: the device comprises an upper plate I101, an inner side plate I102, a lower plate I104, fastening bolts 105, an outer side plate I106, a spline shaft mounting seat 107 and an outer cylinder mounting seat 109;

as shown in fig. 3, the upper plate i 101 and the lower plate i 104 have the same structure, two lateral sides of the upper plate are designed with a strip-shaped groove i 108 extending along the longitudinal direction, the inner plate i 102 and the outer plate i 106 are inserted into the strip-shaped grooves i 108 of the upper plate i 101 and the lower plate i 104, and the matching parts are engaged with each other and constrained to form a rectangular structure with two open ends, and the rectangular structure is fixed by fastening bolts 105 (preferably, the upper plate i 101 and the lower plate i 104 are fixed by twelve fastening bolts 105, and six fastening bolts 105 are respectively arranged along the longitudinal direction on two lateral sides of the upper plate i 101 corresponding to the lower plate i 104);

as shown in FIG. 4, a circular hole 110 is formed in one longitudinal end of the inner side plate I102, and the circular hole 110 is used for installing a spline shaft and penetrating cables and pipelines; as shown in fig. 5, a rectangular hole 111 is formed in one end of the outer plate i 106, which corresponds to the circular hole 110 in the inner plate i 102, and is used as a positioning and welding hole of the spline shaft mounting seat 107; on the premise of ensuring the strength requirement, more than one lightening hole is respectively formed in the longitudinal other parts of the inner side plate I102 and the outer side plate I106, and meanwhile, lightening design is also carried out on the upper plate I101 and the lower plate I104;

the longitudinal other ends of the inner side plate I102 and the outer side plate I106 are both provided with a limiting pin I hole, the primary inner arm assembly 2 stretches to a set position relative to the outer arm assembly 1, and the primary inner arm assembly 2 is limited by inserting a limiting pin I103 into the limiting pin I hole;

the spline shaft mounting seat 107 is mounted and welded in a rectangular hole 111 in the outer side plate I106, so that materials are saved, and the strength requirement can be met; two outer cylinder mounting seats 109 are symmetrically welded on the upper plate I101 and the lower plate I104 and are used for mounting the cylinder bodies of the two driving oil cylinders 4.

In this embodiment, as shown in fig. 6, the primary inner arm assembly 2 includes: the anti-abrasion sliding plate comprises a wear-resistant sliding plate I201, an upper plate II 202, a lower plate II 205, an outer side plate II 206 and an inner side plate II 208;

the outer side plate II 206 and the inner side plate II 208 have the same structure, as shown in FIG. 7, the two transverse sides of one longitudinal end of the outer side plate II are provided with limiting pin mounting holes 209, when the second-stage inner arm assembly 3 stretches to a set position relative to the first-stage inner arm assembly 2, the longitudinal stretching of the second-stage inner arm assembly 3 can be limited by inserting the limiting pin II 204 into the limiting pin mounting holes 209;

the transverse middle parts of the back surfaces of the outer side plate II 206 and the inner side plate II 208 are provided with mounting grooves 210 extending along the longitudinal direction, wear-resistant sliding plates I201 are arranged in the mounting grooves 210 and are fastened through screws arranged in threaded holes 211, and the wear-resistant sliding plates I201 are in sliding fit with sliding grooves formed in the opposite surfaces of the inner side plate I102 and the outer side plate I106;

limiting grooves I212 are respectively arranged at corresponding positions on the two transverse sides of the wear-resistant sliding plate I201 on the outer side plate II 206 and the inner side plate II 208, are used as sliding rails of the first-stage inner arm assembly and are in sliding fit with limiting pins I103 fixed on the outer arm assembly 1;

as shown in fig. 8, the two lateral sides of the opposite surfaces of the outer side plate ii 206 and the inner side plate ii 208 are provided with a strip-shaped groove ii 213, which can constrain the upper plate ii 202 and the lower plate ii 205, ensure reliable strength, and play a positioning role in welding after the upper plate ii 202 and the lower plate ii 205 are inserted;

the wear-resistant sliding plates I201 are also respectively arranged on the back surfaces of the upper plate II 202 and the lower plate II 205, the four wear-resistant sliding plates I201 are made of nylon materials and are arranged on the four outer surfaces of the primary inner arm assembly 2, the wear-resistant sliding plate has good mechanical property, wear resistance, high tensile and compressive strength, good self-lubricating property, high temperature resistance and high heat resistance, can work for a long time at a temperature resistance value of-60 to +100 ℃, and can instantly resist temperature of about 130 ℃.

In the embodiment, in order to reinforce the maximum stressed deformation part of the first-stage inner arm and effectively ensure the bearing capacity of the telescopic arm device in the fully extended state, two hoops I203 are sleeved on a rectangular frame formed by an upper plate II 202, a lower plate II 205, an outer plate II 206 and an inner plate II 208; wherein, be equipped with two holes on every staple bolt I203, two holes on one staple bolt I203 are the through-hole, and two holes on another staple bolt I203 are the screw hole.

In this embodiment, a second-stage inner arm limiting block 207 is welded to the outer side plate ii 206 and the inner side plate ii 208, respectively, and is used for limiting the retraction stroke of the second-stage inner arm assembly 3.

In this embodiment, as shown in fig. 9, the secondary inner arm assembly 3 includes: the wear-resistant sliding plate II 301, the upper plate III 302, the inner side plate III 303, the outer side plate III 304, the lower plate III 305, the hoop II 306 and the inner cylinder mounting seat 307;

the structural design mode of the upper plate III 302, the lower plate III 305, the outer plate III 304 and the inner plate III 303 is the same as that of the upper plate II 202, the lower plate II 205, the outer plate II 206 and the inner plate II 208 in the primary inner arm assembly 2, and the difference is that a motor shaft mounting seat 308 (shown in figure 10) is integrally machined at one end part of the inner plate III 303 extending out of the primary inner arm assembly 2, so that the strength of the secondary inner arm assembly 3 is improved, and the mounting reliability of the driving oil cylinder 4 is improved;

the two inner cylinder mounting seats 307 are symmetrically welded on the upper end surface and the lower end surface of the motor shaft mounting seat 308, wherein the inner cylinder mounting seats 307 are separately machined and formed, the size is convenient to control, and the machining difficulty is reduced;

the structural design mode and the material of wear-resisting slide I201 and staple bolt I203 in wear-resisting slide II 301 and staple bolt II 306 and the one-level inner arm assembly 2 are the same, the function is similar with wear-resisting slide I201 and staple bolt I203 in the one-level inner arm assembly 2, all install wear-resisting slide II 301 on four surfaces of second grade inner arm assembly 3 promptly, the cover is equipped with two staple bolts II 306 on the cuboid frame that upper plate III 302, interior plate III 303, outer panel III 304 and hypoplastron III 305 formed.

In the embodiment, the driving oil cylinder 4 adopts a double-acting hydraulic cylinder structure, and the design parameters of the double-acting hydraulic cylinder structure meet the index requirements of the arm length and the stroke and the pressure requirement when the telescopic arm device acts;

two driving oil cylinders 4 are symmetrically arranged between the outer arm assembly 1 and the second-stage inner arm assembly 3, and the two driving oil cylinders 4 can remove the deflection force generated by the first-stage inner arm assembly 2 and the second-stage inner arm assembly 3 during extension or retraction, so that the extension or retraction effect is better; meanwhile, the arrangement of the two driving oil cylinders 4 ensures the redundancy of the driving piece, namely, one driving oil cylinder 4 has a problem, and the other driving oil cylinder 4 can be used as a standby driving piece, so that the performance of the whole vehicle is ensured.

The working principle of the telescopic arm device is as follows: as shown in fig. 11, when the piston rod cavity of the driving cylinder 4 is filled with oil, the piston rod retracts to push the second-stage inner arm assembly 3 to retract into the first-stage inner arm assembly 2, and when the end of the second-stage inner arm assembly 3 touches the second-stage inner arm limiting block 207, the first-stage inner arm assembly 2 is continuously pushed to retract together with respect to the outer arm assembly 1 until the outer surface of the first-stage inner arm assembly 2 hits the side wall of the spline shaft mounting seat 107, the two-stage telescopic arm unit stops sliding, and at this time, the telescopic arm device retracts to the position with the shortest arm length;

as shown in fig. 12, when the piston cavity of the driving cylinder 4 is filled with oil, the piston rod is extended, and the second-stage inner arm assembly 3 is pulled to be extended relative to the first-stage inner arm assembly 2; when the end of the spacing groove II on the outer side plate III 304 of the second-stage inner arm assembly 3 is butted against the spacing pin II 204 (the spacing pin II 204 is in sliding fit with the spacing groove II), the second-stage inner arm assembly 3 is stretched in place relative to the first-stage inner arm assembly 2, the pulling of the first-stage inner arm assembly 2 is stretched relative to the outer arm assembly 1, when the end of the spacing groove I212 on the outer side plate II 206 of the first-stage inner arm assembly 2 is butted against the spacing pin I103 (the spacing pin I103 is in sliding fit with the spacing groove I212), the two-stage telescopic arm unit stops sliding, and at the moment, the telescopic arm device stretches to the position with the longest arm length.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.