Folding telescopic boom device

Abstract

According to the folding telescopic boom device, a first supporting arm and a second supporting arm are fixedly connected, the first supporting arm is hinged to the top end of a stand column, and the two ends of a first telescopic cylinder are hinged between the second supporting arm and the stand column; the second supporting arm is hinged to one end of the second telescopic cylinder; one end of a middle hinged plate support is hinged to one end of a middle hinged plate and the other end of a second telescopic cylinder, the other end of the middle hinged plate support is hinged to one end of a third supporting arm base, and one end of a middle extending plate is hinged to the other end of the middle hinged plate. The other end of the middle extending plate is hinged to the other end of the third supporting arm base. The third supporting arm base is fixedly connected with a third supporting arm, the third supporting arm base is hinged to one end of a third telescopic cylinder, the other end of the third telescopic cylinder is hinged to the third supporting arm, and a functional equipment connecting support is installed at the tail end of the third supporting arm and connected with functional equipment. The device can reach the required operation range after being unfolded, and vehicle driving safety is not affected after being folded and contracted.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical equipment, and in particular, relates to a foldable telescopic arm device. Background Art

[0002] The sanitation green plant trimming vehicle usually connects the operating equipment to the vehicle through a telescopic arm. In order to achieve a longer distance and larger area of ​​operation, the arm has to be lengthened to complete a large range of work. Although the extended arm meets the requirements of completing the operation, the extension of the arm will occupy the vehicle volume. Generally, the lengthened green plant equipment is placed and fixed in the vehicle's cargo box or installed on the chassis. The installation method in the cargo box directly occupies the volume of the cargo box and reduces the volume of the cargo loaded in the cargo box. Installing it on the chassis makes the structure of the chassis more complicated, and its installation, disassembly, operation and maintenance are not convenient. Moreover, the equipment may be damaged by bumps during the movement of the vehicle. Moreover, installing it on the chassis occupies the area of ​​the chassis, and it is difficult to install other equipment on the chassis, which limits the use of the vehicle and makes the vehicle limited to this type of work.

[0003] Therefore, it is necessary to improve the boom structure and its installation position so that the boom does not occupy the volume of the bucket and does not need to be installed on the chassis. Summary of the invention

[0004] In order to solve the above problems, the present application provides a foldable and telescopic arm device, which can be carried at the front end of a vehicle. After the arm is unfolded and extended, the functional equipment connection assembly can reach an ideal operating range, and its operating field of view is wide, which is conducive to the operation of the operating equipment. After the operation is completed, the arm is folded and retracted and placed in front of the cab. It has the characteristics of small volume and low height after folding and retracting, so that its volume after folding and retracting will not exceed the width of the cab on the left and right, and its height will not cover the cab glass. The equipment is light in weight, and the equipment will not affect the driving safety of the vehicle. The equipment is easy to carry on the vehicle and does not occupy the bucket and chassis position at the rear of the vehicle.

[0005] The present application provides a folding telescopic arm device, comprising:

[0006] Column;

[0007] A first support arm and a first telescopic cylinder, wherein one end of the first support arm is hinged to the top end of the column, the other end of the first support arm is fixedly connected to one end of the second support arm, and both ends of the first telescopic cylinder are hinged between the one end of the second support arm and the column;

[0008] a second supporting arm and a second telescopic cylinder, wherein the one end of the second supporting arm is hinged to one end of the second telescopic cylinder;

[0009] A middle hinge assembly, comprising a middle hinge plate, a middle hinge plate bracket, a third support arm base, and a middle extension plate, one end of the middle hinge plate bracket is hinged with one end of the middle hinge plate and the other end of the second telescopic cylinder, the other end of the middle hinge plate bracket is hinged with one end of the third support arm base, the other end of the second support arm is fixedly connected with the middle extension plate, one end of the middle extension plate is hinged with the other end of the middle hinge plate, and the other end of the middle extension plate is hinged with the other end of the third support arm base;

[0010] A third support arm and a third telescopic cylinder, a side of the third support arm base opposite to its two hinge points is fixedly connected to the third support arm, the third support arm is a multi-section telescopic type, and a side of the third support arm base opposite to its two hinge points is also hinged to one end of the third telescopic cylinder, and the other end of the third telescopic cylinder is hinged to the end of the multi-section telescopic structure of the third support arm;

[0011] The functional equipment connecting bracket is installed at the end of the multi-section telescopic structure of the third supporting arm and is used for connecting with the functional equipment.

[0012] After the folding and telescopic boom device is unfolded, the functional head of the operating equipment can reach an ideal operating range, and its operating field of vision is wide, which is conducive to equipment operation; after the operation is completed, the boom is folded and retracted to have a small volume, low height, and small space occupation.

[0013] Optionally, it also includes a fourth telescopic cylinder and a head hinge assembly, the head hinge assembly includes a head articulated plate, a head articulated plate bracket, a functional device connecting bracket, and a head extension plate, one end of the fourth telescopic cylinder is hinged on a telescopic joint of the third support arm, one end of the head articulated plate bracket is hinged to one end of the head articulated plate and the other end of the fourth telescopic cylinder, the other end of the head articulated plate bracket is hinged to one end of the functional device connecting bracket, one end of the head extension plate is hinged to the other end of the head articulated plate, and the other end of the head extension plate is hinged to the other end of the functional device connecting bracket.

[0014] The head hinge assembly can control the working angle of the working equipment, and can flexibly control the position of the working equipment, which increases the application range of the folding telescopic arm device. In addition, combined with the middle hinge assembly, the working equipment can be used for high-altitude operations, such as trimming branches, and can also be used for ground operations, such as mowing the lawn.

[0015] Optionally, the pillar is installed at the front end of the vehicle, and the height of the pillar is lower than the bottom edge of the front window of the vehicle.

[0016] The folding telescopic arm device is installed at the front end of the vehicle and does not occupy the space in the rear bucket. Moreover, when connected with a snow and ice removal vehicle, for example, since the snow and ice removal vehicle is usually connected to a detachable snow pusher and other operating equipment through a mounting connection point, the folding telescopic arm device can share the connection structure of the snow and ice removal equipment, making it easy to mount the equipment on the vehicle, without occupying the rear bucket space and chassis of the vehicle for other purposes, and also avoiding other unnecessary connection structure costs.

[0017] Optionally, the one end of the second support arm is connected to the other end of the first support arm at an inclined angle.

[0018] The space occupied by the foldable telescopic arm device after folding and contracting can be further reduced, and the space can be kept within the width of the vehicle. The foldable telescopic arm device does not need to be disassembled during driving, which improves the ease of use of the foldable telescopic arm device and greatly improves its operating efficiency.

[0019] Optionally, both ends of the first telescopic cylinder are hinged between the inner side of one end of the second support arm and the column; the outer side of one end of the second support arm is hinged to the outer side of one end of the second telescopic cylinder, and the inner side refers to the side where the area surrounded by the first support arm, the second support arm, the middle hinge assembly, and the third support arm is folded and contracted as the inner side, and the opposite side is the outer side.

[0020] Optionally, the one end of the middle extension plate is located in a direction close to the one end of the second support arm relative to the other end thereof, and extends to the inner side;

[0021] The one end of the head extension plate is located in a direction close to the third support arm base relative to the other end thereof and extends to the inside.

[0022] By arranging the extension plate, the retraction angle range of the hinge assembly can be expanded.

[0023] Optionally, the middle hinge plate, the middle hinge plate bracket, the third support arm base and the middle extension plate are all two-piece, and the second telescopic cylinder and the second support arm are clamped and installed in the middle;

[0024] The head hinge plate, the head hinge plate bracket, the functional equipment connecting bracket and the head extension plate are all of two-piece type, and the fourth telescopic cylinder and the third supporting arm are clamped in the middle for installation.

[0025] Optionally, the side where the middle hinge plate and the middle hinge plate bracket are close to each other is in a concave arc shape;

[0026] The side where the head hinge plate and the head hinge plate bracket are close to each other is in a concave arc shape.

[0027] The concave arc shape can reduce interference when the hinge assembly is retracted, thereby expanding the range of its retraction angle.

[0028] Optionally, it further comprises a slide rail and a slide bracket assembly, wherein the slide rail is installed at the front end of the vehicle along the width direction of the vehicle, the slide bracket assembly is slidably installed on the slide rail, and the column is rotatably installed on the slide bracket assembly.

[0029] A swing cylinder and a connecting plate assembly are also installed on the sliding bracket assembly. The connecting plate assembly includes a first end and a second end. The first end is fixedly connected to the column, and the second end is hinged to one end of the swing cylinder. The other end of the swing cylinder is hinged to the sliding bracket assembly.

[0030] The folding and retracting arm can be moved in the width direction of the vehicle through the slide rail to adapt to different working environments and improve its applicability. The folding and retracting arm device can be swung to a suitable working position through the swing cylinder drive.

[0031] Optionally, it also includes a recovery plate assembly, which is fixedly connected to the sliding bracket assembly and is used to support under the functional equipment connection bracket after the arm device is folded and contracted.

[0032] Optionally, it also includes a hydraulic control system, which includes a first hydraulic pump, a second hydraulic pump, an electromagnetic overflow valve and a working equipment drive component.

[0033] The first hydraulic pump supplies oil to the operating equipment drive member, and the second hydraulic pump supplies oil to the first telescopic cylinder, the second telescopic cylinder, the third telescopic cylinder, the fourth telescopic cylinder, the swing cylinder, and the moving motor.

[0034] An electromagnetic relief valve is connected to the oil outlet of the first hydraulic pump, and an electromagnetic relief valve is connected to the oil outlet of the second hydraulic pump.

[0035] The electromagnetic relief valve 31 includes a two-position two-way electromagnetic valve and a relief valve connected in parallel, and the oil inlet and outlet ports of the two-position two-way electromagnetic valve and the relief valve are respectively connected to the oil inlet and oil outlet of the operating equipment drive. When the two-position two-way electromagnetic valve is not energized, the electromagnetic valve is closed, and the main valve core pressure of the relief valve is controlled by the pilot valve. When the system pressure reaches the set value, the pilot valve opens, controls the main valve core to open, and the excess oil flows back to the oil tank to maintain the pressure stability of the operating equipment drive 32. When the two-position two-way electromagnetic valve is energized, the electromagnetic valve opens, and the main valve core of the relief valve is directly connected to the oil tank through the electromagnetic valve, the pressure of the large-displacement pump is unloaded, and the operating equipment drive 32 stops working, protecting the hydraulic motor from damage due to excessive load.

[0036] Optionally, a balancing valve is connected to the oil circuit of the rodless chamber of the first telescopic cylinder;

[0037] The oil inlet and outlet of the second telescopic cylinder are both connected with a balancing valve;

[0038] The oil circuit of the rod chamber of the third telescopic cylinder is connected with a balance valve;

[0039] The oil circuit of the rod chamber of the fourth telescopic cylinder is connected with a balance valve.

[0040] The balancing valve 201 of the first telescopic cylinder is subjected to the largest load when the first telescopic cylinder 8 is extended and needs to remain extended to a certain position without moving, so it plays the role of maintaining the load and controlling the load to reduce stalling when descending.

[0041] The balancing valve 201 of the oil inlet and outlet of the second telescopic cylinder 10, when the second telescopic cylinder 10 is in operation, there will be a state where sometimes there is a rod chamber that needs to maintain pressure oil, and sometimes there is no rod chamber that needs to maintain pressure oil. The balancing valve 201 can prevent the oil cylinder from accidentally moving to maintain the load.

[0042] The balancing valve 201 of the rod chamber oil circuit of the third telescopic cylinder 14 keeps the third telescopic cylinder 14 in a downwardly extended state during operation to prevent stalling due to load.

[0043] Optionally, a floating solenoid valve is connected to the oil circuit of the first telescopic cylinder, and a floating solenoid valve is also connected to the oil circuit of the fourth telescopic cylinder. Any floating solenoid valve includes two two-position two-way valves, one two-position two-way valve is connected between the oil inlet circuit of the telescopic cylinder and the hydraulic oil tank, and the other two-position two-way valve is connected between the oil outlet circuit of the telescopic cylinder and the hydraulic oil tank.

[0044] During the use of the foldable telescopic arm device, if a machine used for working on the ground (such as a grass trimmer, etc.) needs to perform a profiling operation due to uneven ground, the two floating solenoid valves can be energized to open the rod chamber and the rodless chamber of the cylinder to connect with the oil tank to perform the profiling action.

[0045] The folding telescopic arm device has four telescopic cylinders in total. The function of the first telescopic cylinder is to lift and lower the folding arm as a whole during operation. The function of the second telescopic cylinder is to expand and retract the middle hinge assembly. The function of the third telescopic cylinder is to extend the operating equipment part and expand the operating range. The function of the fourth telescopic cylinder is to expand and retract the head hinge assembly, that is, to control the working posture of the operating equipment, such as horizontal work, vertical work or work at a certain angle. When the operating equipment is used to work along the ground, the uneven ground will cause the operating equipment to appear in two states, one is the ups and downs in the front and back directions, and the other is the ups and downs in the left and right directions of the operating equipment. In order to eliminate the inconvenience caused by the ups and downs in the front and back directions, the entire folding telescopic arm needs to float up and down. Therefore, a floating solenoid valve can be connected to the oil circuit of the first telescopic cylinder to achieve the floating of the first telescopic cylinder, so that the entire folding telescopic arm can float in the front and back directions to adapt to the ups and downs of the ground.

[0046] The left and right ups and downs rely on the fourth telescopic cylinder that controls the posture of the operating equipment to float, which can flexibly control the left and right movements of the operating equipment. This type of ground operating equipment generally has support wheels at the back to move on the road surface. When the left and right forces are different, the posture is adjusted by the reaction force of the ground. The second and third telescopic cylinders do not use floating solenoid valves to ensure the working position of the operating equipment.

[0047] Optionally, a swing safety relief valve is connected to the oil outlet of the swing cylinder.

[0048] When the boom swings to a certain angle from a fixed position, if the load is too heavy during the swing process, the swing safety relief valve opens to allow the boom to retract, ensuring the overall structural safety.

[0049] Optionally, an oil cooler is connected to the oil return pipeline of the operating equipment drive component.

[0050] Optionally, the hydraulic oil tank is integrated with an oil suction filter and an oil return filter. The oil return filter is arranged between the oil return main pipeline and the hydraulic oil tank. The return oil of the operating equipment driving parts, and the first telescopic cylinder, the second telescopic cylinder, the third telescopic cylinder, the fourth telescopic cylinder, the swing cylinder, and the mobile motor are converged into the oil return main pipeline and then returned to the hydraulic oil tank.

[0051] Optionally, the balancing valve of the first telescopic cylinder is also connected to the accumulator via a two-position two-way valve.

[0052] The accumulator 34 stores high-pressure oil during the lifting process, which plays a role in rapid response and preventing the first support arm 9 from moving incoherently due to pressure instability and absorbing pressure fluctuations, and also prevents the first support arm 9 from descending unexpectedly when the system oil pressure is insufficient.

[0053] Optionally, a two-position two-way valve is connected to the oil inlet of the swing cylinder. When the swing cylinder is actuated, the two-position two-way valve is opened, and when the swing cylinder stops actuating, the two-position two-way valve is closed.

[0054] When the swing cylinder moves, the two-position two-way valve is energized and opened, and when the swing cylinder stops moving, the two-position two-way valve is closed. Closing can prevent the swing cylinder's rodless chamber from automatically absorbing oil when the overflow valve is actuated due to load, and it cannot return to the original working position after the load is removed.

[0055] Compared with the prior art, this application has the following beneficial effects:

[0056] The foldable telescopic arm device of the present application can be installed at the front end of the vehicle, so it will not occupy the space of the rear bucket. Moreover, when connected with a snow and ice removal vehicle, for example, since the snow and ice removal vehicle is usually connected to a detachable snow pusher and other operating equipment through a mounting connection point, the foldable telescopic arm device can share the connection structure of the snow and ice removal equipment, which is convenient for the equipment to be mounted on the vehicle, does not occupy the rear bucket space of the vehicle and other uses such as the chassis, and also avoids other unnecessary connection structure costs.

[0057] After the folding and telescopic boom device of the present application is unfolded, the functional head of the operating equipment can reach an ideal operating range, and its operating field of view is wide, which is conducive to equipment operation; after the operation is completed, the boom is folded and retracted and placed in front of the cab. After folding and retracting, it has a small size and a low height. Its size will not exceed the width of the cab on the left and right, and its height will not cover the cab glass, and the equipment will not affect the driving safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a three-dimensional schematic diagram of a foldable telescopic arm device according to an embodiment of the present invention;

[0059] Figure 2 A schematic diagram of the expansion and contraction of the middle hinge assembly according to an embodiment of the present invention;

[0060] Figure 3 It is a schematic diagram of the expansion and contraction of the foldable telescopic arm device according to an embodiment of the present invention.

[0061] Figure 4 It is a schematic diagram of the arrangement of the first to fourth telescopic cylinders and the moving motor described in an embodiment of the present invention.

[0062] Figure 5 It is a schematic diagram of a hydraulic control system according to an embodiment of the present invention.

[0063] Reference numerals:

[0064] Swing cylinder 1, connecting plate assembly 2, sliding bracket assembly 3, recovery plate assembly 4, slide rail frame assembly 5, vehicle connection assembly 6, column 7, first telescopic cylinder 8, first support arm 9, second telescopic cylinder 10, middle hinged plate 11, middle hinged plate bracket 12, third support arm base 13, third telescopic cylinder 14, third support arm 15, fourth telescopic cylinder 16, head hinged plate 17, head hinged plate bracket 18, functional equipment connection bracket 19, functional equipment connection assembly 20, second support arm 21, middle extension plate 22, connecting splint 23, head extension plate 24, mobile motor 25, double pump 26, hydraulic oil tank 27, oil suction filter 28, return oil filter 29, oil cooler 30, electromagnetic overflow valve 31, operating equipment drive 32, accumulator 34, floating electromagnetic valve 35, swing safety overflow valve 37, two-position two-way electromagnetic valve 101, balance valve 201 DETAILED DESCRIPTION

[0065] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] In the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be detachably connected or non-detachably connected; it can be directly connected or indirectly connected through an intermediate medium. Among them, "fixed connection" means that the relative position relationship after connection remains unchanged. "Rotational connection" means that the two parts are connected to each other and can rotate relative to each other after connection. The directional terms mentioned in the embodiments of the present application, such as "front", "rear", "inside", "outside", "middle", "clockwise", "counterclockwise", "vertical", "horizontal", "top", etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying 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 embodiments of the present application. Among them, the two components are obtained by an integrated molding process. The integrated structure means that in the process of forming one of the two components, the component is connected to the other component, and there is no need to connect the two components together by reprocessing (such as bonding, welding, snap connection, screw connection).

[0067] In the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with substantially the same functions and effects. For example, the first support arm and the second support arm are only used to distinguish different support arms, and do not limit their order. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different.

[0068] Please refer to Figure 1 , Figure 2 The folding telescopic arm device of this embodiment mainly includes a column 7, a first telescopic cylinder 8, a first support arm 9, a second telescopic cylinder 10, a second support arm 21, a middle hinged plate 11, a middle hinged plate bracket 12, a third support arm base 13, a third telescopic cylinder 14, a third support arm 15, a fourth telescopic cylinder 16, a head hinged plate 17, a head hinged plate bracket 18, a functional equipment connecting bracket 19, and a functional equipment connecting assembly 20.

[0069] The column 7 is vertically mounted at the front end of the vehicle, and the height of the column 7 should be lower than the lower edge of the front glass of the vehicle, so as not to block the driver's sight when driving the vehicle. The column 7 can be columnar, such as a cylinder, or a round tube.

[0070] One end of the first support arm 9 is hinged to the top of the column through a horizontal hinge point, and the other end of the first support arm 9 is fixedly connected to one end of the second support arm 21 and placed in a connecting splint 23. The connecting splint 23 is similar to a T-shape. The connecting splint 23 is fixedly connected to the second support arm 21. The connecting splint 23 includes two plates arranged at intervals. The inner side of the connecting splint 23 is hinged to one end of the first telescopic cylinder 8 through a first hinge point, and the other end of the first telescopic cylinder 8 is hinged to the inner side of the column 7 through a horizontal hinge point. The lifting and lowering of the boom is controlled by the extension and retraction of the first telescopic cylinder 8, such as Figure 1 In the process, the first telescopic cylinder 8 extends, and the first support arm 9 rotates clockwise around the hinge point with the top of the column to lift up; the first telescopic cylinder 8 contracts, and the first support arm 9 rotates counterclockwise around the hinge point with the top of the column to descend.

[0071] It should be noted that the inner side refers to the side where the area surrounded by the first support arm 9, the second support arm 21, the middle hinge assembly, and the third support arm 15 is contracted as the inner side, and the opposite side is the outer side.

[0072] The outer side of the connecting splint 23 is hinged to one end of the second telescopic cylinder 10 through a hinge point, and the other end of the second telescopic cylinder 10 is connected to the middle hinge assembly. The expansion and folding of the middle hinge assembly can be controlled by the extension and contraction of the second telescopic cylinder. Specifically, the middle hinge assembly includes a middle hinge plate 11, a middle hinge plate bracket 12, a third support arm base 13, and a middle extension plate 22. One end of the middle hinge plate bracket 12 is hinged to one end of the middle hinge plate 11 and the other end of the second telescopic cylinder 10, and the other end of the middle hinge plate bracket 12 is hinged to one end of the third support arm base 13 through a hinge point.

[0073] A middle extension plate 22 is fixedly connected to the end of the second support arm 21, one end of the middle extension plate 22 is hinged to the other end of the middle hinge plate 11, and the other end of the middle extension plate 22 is hinged to the other end of the third support arm base 13 through a hinge point. In addition, in some embodiments, the one end of the middle extension plate 22 is located in the direction of the connecting clamp plate 23 relative to the other end thereof, and extends to the inner side, and the hinge point between the middle hinge plate 11 and the middle extension plate 22 is located on the inner side. Such a layout structure helps to achieve the form of occupying less space as shown by the dotted line when it is finally retracted. It should be noted that the middle extension plate can be integrally formed with the second support arm, or it can be installed at its end by fasteners. In addition, the middle extension plate is not necessary, and it is also possible that the middle hinge plate 11 and the third support arm base 13 are respectively hinged at different positions at the end of the second support arm 21.

[0074] In some embodiments, the middle hinge plate 11, the middle hinge plate bracket 12, the third support arm base 13 and the middle extension plate can all be two-piece, with the second telescopic cylinder 10 and the second support arm 21 clamped in the middle for installation.

[0075] In some embodiments, the middle hinge plate 11 and the middle hinge plate bracket 12 may have a certain curvature, and specifically, the side where the middle hinge plate 11 and the middle hinge plate bracket 12 are close to each other is concave in curvature. In this way, during the contraction of the middle hinge assembly, the concave curvature can provide a certain avoidance space, so that the middle hinge assembly can have a larger contraction range.

[0076] like Figure 2In the figure, the solid line is the state when the middle hinge assembly is unfolded, and the dotted line is the state when the middle hinge assembly is retracted. As shown by the solid line, when the second telescopic cylinder 10 is retracted, the middle hinge plate 11 rotates clockwise around the hinge point between it and the middle extension plate 22, thereby pulling the middle hinge plate bracket 12 hinged thereto to rotate clockwise, and the rotation of the middle hinge plate bracket 12 pulls the one end of the third support arm base 13 to rotate clockwise around the hinge point between the third support arm base 13 and the middle extension plate 22, thereby forming an unfolded form, and at this time the third support arm 15 is facing obliquely upward.

[0077] As shown by the dotted line, when the second telescopic cylinder 10 is extended, the middle hinged plate 11 rotates counterclockwise around the hinge point between it and the middle extension plate 22, thereby pushing the middle hinged plate bracket 12 hinged thereto to rotate counterclockwise, and the rotation of the middle hinged plate bracket 12 pushes the one end of the third support arm base 13 to rotate counterclockwise around the hinge point between the third support arm base 13 and the middle extension plate 22, thereby forming a contracted form, and the third support arm 15 is now facing obliquely downward.

[0078] The third support arm 15 is fixedly connected to the side opposite to the two hinge points of the third support arm base 13, and the third support arm 15 may be a multi-section telescopic structure. Exemplarily, it may include multiple telescopic sections that are sequentially sleeved inside and outside, and the side opposite to the two hinge points of the third support arm base 13 is also hinged to one end of the third telescopic cylinder 14, and the other end of the third telescopic cylinder 14 is hinged to the end of the multi-section telescopic structure of the third support arm 15. When the third telescopic cylinder 14 is extended, the third support arm is extended, and when the third telescopic cylinder 14 is retracted, the third support arm is shortened.

[0079] Furthermore, the third support arm 15 is also connected with a head hinge assembly and a fourth telescopic cylinder 16, and the structure of the head hinge assembly is similar to that of the middle hinge assembly. Specifically, it includes a head hinge plate 17, a head hinge plate bracket 18, a functional device connection bracket 19, and a head extension plate 24. One end of the fourth telescopic cylinder 16 is hinged to a telescopic joint of the third support arm, one end of the head hinge plate bracket 18 is hinged to one end of the head hinge plate 17 and the other end of the fourth telescopic cylinder 16, and the other end of the head hinge plate bracket 18 is hinged to one end of the functional device connection bracket 19. One end of the head extension plate 24 is hinged to the other end of the head hinge plate 17, and the other end of the head extension plate 24 is hinged to the other end of the functional device connection bracket 19.

[0080] In some embodiments, one end of the head extension plate 24 is located in a direction close to the third support arm base 13 relative to the other end thereof, and extends to the inside, and the hinge point between the head hinge plate 17 and the head extension plate 24 is located on the inside. Such a layout structure helps to occupy a smaller space when it is finally retracted. It should be noted that the head extension plate can be integrally formed with the third support arm 15, or it can be installed at its end by fasteners. In addition, the head extension plate is not necessary, and it is also possible for the head hinge plate 17 and the functional device connecting bracket 19 to be hinged at different positions at the end of the third support arm 15.

[0081] In some embodiments, the head hinge plate 17, the head hinge plate bracket 18, the functional device connecting bracket 19 and the head extension plate can all be two-piece, with the fourth telescopic cylinder 16 and the third support arm 15 clamped in the middle for installation.

[0082] In some embodiments, the head hinge plate 17 and the head hinge plate bracket 18 may have a certain curvature, and specifically, the side of the head hinge plate 17 and the head hinge plate bracket 18 that are close to each other is concave in curvature. In this way, during the contraction of the head hinge assembly, the concave curvature can provide a certain avoidance space, so that the head hinge assembly can have a larger contraction range.

[0083] It should be noted that the function of the middle hinge assembly is to enable the third support arm to be lifted and lowered, while the function of the head hinge assembly is to adjust the direction of the functional device connection assembly 20, that is, to adjust the direction of the functional device to be suitable for the operation of the functional device.

[0084] Among them, the functional equipment connection bracket 19 is connected to the functional equipment connection assembly 20, and the functional equipment connection assembly 20 is used to install various working equipment with working functions, such as a pruning machine, which can lift and unfold the folding telescopic arm device, and use the pruning machine to prune high branches and leaves. The functional equipment connection bracket 19 and the functional equipment connection assembly 20 can be integrated or detachably connected. Alternatively, the functional equipment connection bracket 19 itself has the function of connecting functional equipment, and the functional equipment connection assembly 20 is also not required.

[0085] The foldable and telescopic arm device of this embodiment designs the support arm to be a first support arm and a second support arm, which are two sections with bending angles. The cylinder fulcrum and the hinge structure are cleverly and reasonably designed, so that the entire arm can be folded into a very small volume, and the total weight of the equipment is light; it can be conveniently mounted on the front of the vehicle without occupying other positions of the vehicle; the operating visual range is wide, which is conducive to operation.

[0086] In some embodiments, the inner angle at which the first support arm 9 is fixedly connected to the second support arm should be appropriately selected so that when the first telescopic cylinder contracts and the second telescopic cylinder 10 extends, and when the third telescopic cylinder contracts and the fourth telescopic cylinder extends, the support arm can be folded and contracted to not exceed the width of the vehicle, for example, the inner angle is greater than 90 degrees and less than 150 degrees.

[0087] In some embodiments, it also includes a sliding bracket assembly 3, a sliding rail frame assembly 5, and a vehicle connection assembly 6.

[0088] Among them, the slide rail frame assembly 5 is installed at the front end of the vehicle, which is a frame structure, including at least one slide rail. However, it is more stable to use two slide rails. In this embodiment, two parallel slide rails are used. The two parallel slide rails can be connected as a whole through a connector, thereby forming a slide rail frame assembly 5 in the form of a frame. The two parallel slide rails are arranged horizontally or approximately horizontally. For example, the two parallel slide rails can be made of angle steel, with the right-angle surface of the angle steel as the sliding contact surface of the slide rail, and the angle steel is welded between the two slide rails to form a whole slide rail frame assembly. When the slide rail frame assembly 5 is installed at the front end of the vehicle, the slide rail is arranged along the width direction of the vehicle, and the front end serves as the sliding contact surface of the slide rail.

[0089] The vehicle connection assembly 6 is fixedly connected to the slide rail frame assembly 5, and the vehicle connection assembly 6 is used to connect with the hanging structure at the front end of the vehicle cab. The vehicle connection assembly 6 can have a connection structure adapted to the hanging structure, for example, a hook is provided at the front end of the cab, and a through hole is provided on the vehicle connection assembly 6. The vehicle connection assembly 6 can be hung on the hook through the through hole, and can be further reliably fixed to the front end of the vehicle cab by means of tying or fastener connection. Alternatively, the vehicle connection assembly 6 can also be directly connected to the front end of the vehicle by fasteners, and it is not even ruled out that the slide rail frame assembly is installed at the front end of the vehicle by welding.

[0090] The sliding bracket assembly 3 is slidably mounted on the slide rail frame assembly 5 and can slide along the width direction of the vehicle, so that the position of the sliding bracket assembly 3 in the width direction of the vehicle can be adjusted to meet the requirements of its working position.

[0091] In some embodiments, the column is rotatably mounted on the sliding bracket assembly, and a swing cylinder and a connecting plate assembly are also mounted on the sliding bracket assembly. The connecting plate assembly includes a first end and a second end, wherein the first end is fixedly connected to the column, and the second end is hinged to one end of the swing cylinder, and the other end of the swing cylinder is hinged to the sliding bracket assembly. A swing cylinder 1 and a connecting plate assembly 2 are also mounted on the sliding bracket assembly 3. The connecting plate assembly 2 is plate-shaped and includes a first end and a second end. The first end is rotatably mounted on the sliding bracket assembly 3, and the second end is hinged to one end of the swing cylinder 1, and the other end of the swing cylinder 1 is hinged to the sliding bracket assembly 3. The column 7 can be driven to rotate by the extension and retraction of the swing cylinder 1, thereby adjusting the first support arm mounted on its top end to swing to a suitable position.

[0092] For example, when performing an operation, the swing cylinder 1 drives the connecting plate assembly 2 to swing 30°, that is, the first support arm swings 30°, so as to match the working position. When the operation is completed, the swing cylinder drives the first support arm to swing to a vertical plane parallel to the width direction of the vehicle, so that it can be retracted and folded at the front end of the vehicle.

[0093] In some embodiments, a recovery plate assembly 4 is also included, which is fixedly connected to the sliding bracket assembly 3 and extends horizontally or approximately horizontally to the side where the support arm is located, and is used to support the functional device connection assembly 20 below the support arm after it is contracted and folded.

[0094] The folding telescopic boom device is installed at the front end of the vehicle through the vehicle connection assembly 6. When operating, the functional equipment connection assembly 20 can be connected to the functional equipment, the first telescopic cylinder 8 is extended, and the first support arm 9 is lifted. Then the second telescopic cylinder 10 is retracted, and the middle hinge assembly is unfolded to lift the third support arm 15. Then the third telescopic cylinder 14 is extended, and the third support arm is extended. Then the fourth telescopic cylinder 16 is extended to control the movement of the head hinge assembly, thereby adjusting the working angle of the functional equipment. Then the swing cylinder 1 is extended, and the column 7 is swung in a circle in front of the cab to adjust the working angle of the boom, and then the functional equipment can be used for operation.

[0095] After the operation is completed, the swing cylinder 1 drives the column to rotate, so that the support arm rotates to the vertical plane in the vehicle width direction, the fourth telescopic cylinder 16 contracts, and then the third telescopic cylinder 14 contracts, and the third support arm shortens. Then the second telescopic cylinder 10 extends, so that the middle hinge assembly contracts, so that the third support arm 15 swings down. The first telescopic cylinder 8 retracts, and the functional equipment connection assembly 20 moves back to the recovery plate assembly 4 and stops, completing the folding and recovery of the entire boom. The recovery plate assembly plays the role of supporting the entire boom and the functional head to prevent the boom from falling due to failure of the telescopic cylinder.

[0096] In some embodiments, the sliding bracket assembly 3 moves left and right along the slide rail frame assembly 5, which is driven by the moving motor 25. The output shaft of the moving motor 25 is connected to a sprocket, and a chain is fixedly connected to the sliding bracket assembly 3, and the chain is meshed with the sprocket. When the moving motor 25 is running forward, the chain is driven to move by the sprocket, so that the sliding bracket assembly 3 moves left and right along the slide rail frame assembly 5.

[0097] The folding telescopic boom device also includes a hydraulic control system, which includes a double pump 26, a hydraulic oil tank 27, an oil suction filter 28, an oil return filter 29, an oil cooler 30, an electromagnetic overflow valve 31, an operating equipment drive 32, an accumulator 34, a floating solenoid valve 35, a swing safety overflow valve 37, a two-position two-way solenoid valve 101, and a balancing valve 201.

[0098] One of the large displacement pumps of the double pump is responsible for supplying oil to the operating equipment drive 32. The operating equipment drive in this embodiment is a motor, but it can also be other mechanisms, such as a hydraulic cylinder. The other small displacement pump is responsible for supplying oil to the first telescopic cylinder 8, the second telescopic cylinder 10, the third telescopic cylinder 14, the fourth telescopic cylinder 16, the swing cylinder 1, and the moving motor 25, and the two routes do not interfere with each other.

[0099] Of course, it is also possible not to use a duplex pump but to use two independent hydraulic pumps.

[0100] The hydraulic oil tank 27 is used to store hydraulic oil and supply oil to the entire hydraulic control system through the duplex pump 26; the hydraulic oil tank 27 is integrated with an oil suction filter 28 and an oil return filter 29. Specifically, the oil suction filter 28 is arranged between the oil inlet of the duplex pump 26 and the hydraulic oil tank 27. The oil return filter 29 is arranged between the oil return main pipeline and the hydraulic oil tank 27. The return oil of the operating equipment driving component 32, the first telescopic cylinder 8, the second telescopic cylinder 10, the third telescopic cylinder 14, the fourth telescopic cylinder 16, the swing cylinder 1, and the moving motor 25 are returned to the hydraulic oil tank 27 after merging into the oil return main pipeline.

[0101] The oil outlet of the large displacement pump is connected to the oil inlet of the working equipment drive member 32 , and the oil outlet of the working equipment drive member 32 is connected to the hydraulic oil tank 27 through the return oil filter 29 .

[0102] The oil outlet of the large-displacement pump is connected with an electromagnetic relief valve 31. Specifically, the electromagnetic relief valve 31 includes a two-position two-way electromagnetic valve and a relief valve connected in parallel. The oil inlet and outlet ports of the two-position two-way electromagnetic valve and the relief valve are respectively connected to the oil inlet and oil outlet of the operating equipment drive 32. When the two-position two-way electromagnetic valve is not energized, the electromagnetic valve is closed, and the main valve core pressure of the relief valve is controlled by the pilot valve. When the system pressure reaches the set value, the pilot valve opens, controls the main valve core to open, and the excess oil flows back to the oil tank to maintain the pressure stability of the operating equipment drive 32. When the two-position two-way electromagnetic valve is energized, the electromagnetic valve opens, and the main valve core of the relief valve is directly connected to the oil tank through the electromagnetic valve, the pressure of the large-displacement pump is unloaded, and the operating equipment drive 32 stops working, protecting the hydraulic motor from damage due to excessive load.

[0103] Similarly, an electromagnetic relief valve 31 is also connected to the oil outlet line of the small displacement pump of the double pump 26. Its function is the same as that of the aforementioned electromagnetic relief valve 31, and its description is omitted here.

[0104] In some embodiments, a balancing valve 201 is connected to the rodless chamber oil circuit (oil inlet circuit) of the first telescopic cylinder 8 to maintain the load, prevent overload, control load reduction, etc. The balancing valve 201 is used to maintain the load and control the load reduction stall when descending because the load on the first telescopic cylinder 8 is the largest when it is extended and needs to be kept extended to a certain position.

[0105] Furthermore, the balance valve 201 of the first telescopic cylinder 8 is also connected to the accumulator 34 through a two-position two-way valve 101, and a nitrogen pre-charged accumulator can be used. The accumulator 34 is used to store the excess hydraulic energy at the peak power when the multi-functional arm is lifted, and release it when needed to compensate for the problem of the first support arm suddenly falling out of control due to the instantaneous power shortage during the lifting process of the multi-functional arm.

[0106] In some embodiments, a balancing valve 201 is connected to the oil inlet and outlet of the second telescopic cylinder 10. During the operation of the second telescopic cylinder 10, sometimes there is a rod chamber that needs to maintain pressure oil, and sometimes there is no rod chamber that needs to maintain pressure oil. The balancing valve 201 can prevent the oil cylinder from accidentally moving and maintain the load.

[0107] In some embodiments, the rod chamber oil circuit (oil outlet) of the third telescopic cylinder 14 is connected to a balancing valve 201 to keep the third telescopic cylinder 14 in a downwardly extended state during operation to prevent stalling due to load.

[0108] In some embodiments, the rod chamber oil circuit (oil outlet) of the fourth telescopic cylinder 16 is connected to a balancing valve 201 to maintain the load in the rod chamber of the fourth telescopic cylinder 14 and prevent disordered movement due to external loads during operation.

[0109] In some embodiments, a floating solenoid valve 35 is connected to the oil circuit of the first telescopic cylinder 8, and the floating solenoid valve 35 includes two two-position two-way valves, one of which is connected between the oil inlet and the hydraulic oil tank, and the other is connected between the oil outlet and the hydraulic oil tank. In addition, a floating solenoid valve 35 is also connected to the oil circuit of the fourth telescopic cylinder 16, and the floating solenoid valve 35 includes two two-position two-way valves, one of which is connected between the oil inlet and the hydraulic oil tank, and the other is connected between the oil outlet and the hydraulic oil tank. During the use of the folding telescopic boom device, if the machine (such as a grass trimmer) used for working on the ground needs to perform a contouring operation due to uneven ground, the floating solenoid valves 35 at these two locations can be powered on to open so that the rod chamber and the rodless chamber of the oil cylinder are connected to the oil tank to perform the contouring action.

[0110] In some embodiments, a swing safety relief valve 37 is connected to the oil outlet of the swing cylinder 1, and a direct-acting relief valve can be used. When the boom swings a certain angle from a fixed position, if the load is too large during the swing process, the swing safety relief valve 37 opens to allow the boom to retract, ensuring the overall structural safety.

[0111] In some embodiments, an oil cooler 30 is connected to the oil return pipeline of the operating equipment. The oil cooler 30 can select an air-cooled radiator, and the start and stop of the radiator is controlled by a temperature control switch to avoid hydraulic oil deterioration and damage to hydraulic components due to excessive oil temperature.

[0112] In some embodiments, a two-position two-way valve 101 is connected to the oil inlet of the swing cylinder. When the swing cylinder is in motion, the two-position two-way valve 101 is energized to open, and when the swing cylinder stops moving, the two-position two-way valve 101 is closed. Closing can prevent the rodless chamber of the swing cylinder 1 from automatically absorbing oil when the swing safety relief valve 37 overflows due to load, and cannot return to the original working position after the load is eliminated. (In a hydraulic system, the liquid is incompressible, and the pressure will be transmitted to each part in a closed system. When the pressure in the rod chamber decreases, in order to maintain the balance of the system pressure, the hydraulic oil in the rodless chamber will automatically flow into the rod chamber under the action of the system pressure.

[0113] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations shall fall within the protection scope of the claims of the present invention.

Claims

1. A foldable telescopic arm device, characterized in that: include: Column; A first support arm and a first telescopic cylinder, wherein one end of the first support arm is hinged to the top end of the column, the other end of the first support arm is fixedly connected to one end of the second support arm, and both ends of the first telescopic cylinder are hinged between the one end of the second support arm and the column; a second supporting arm and a second telescopic cylinder, wherein the one end of the second supporting arm is hinged to one end of the second telescopic cylinder; A middle hinge assembly, comprising a middle hinge plate, a middle hinge plate bracket, a third support arm base, and a middle extension plate, one end of the middle hinge plate bracket is hinged with one end of the middle hinge plate and the other end of the second telescopic cylinder, the other end of the middle hinge plate bracket is hinged with one end of the third support arm base, the other end of the second support arm is fixedly connected with the middle extension plate, one end of the middle extension plate is hinged with the other end of the middle hinge plate, and the other end of the middle extension plate is hinged with the other end of the third support arm base; A third support arm and a third telescopic cylinder, a side of the third support arm base opposite to its two hinge points is fixedly connected to the third support arm, the third support arm is a multi-section telescopic type, and a side of the third support arm base opposite to its two hinge points is also hinged to one end of the third telescopic cylinder, and the other end of the third telescopic cylinder is hinged to the end of the multi-section telescopic structure of the third support arm; The functional equipment connecting bracket is installed at the end of the multi-section telescopic structure of the third supporting arm and is used for connecting with the functional equipment.

2. The foldable telescopic arm device according to claim 1, characterized in that: It also includes a fourth telescopic cylinder and a head hinge assembly, the head hinge assembly includes a head articulated plate, a head articulated plate bracket, a functional device connecting bracket, and a head extension plate, one end of the fourth telescopic cylinder is hinged on a telescopic joint of the third support arm, one end of the head articulated plate bracket is hinged to one end of the head articulated plate and the other end of the fourth telescopic cylinder, the other end of the head articulated plate bracket is hinged to one end of the functional device connecting bracket, one end of the head extension plate is hinged to the other end of the head articulated plate, and the other end of the head extension plate is hinged to the other end of the functional device connecting bracket.

3. The foldable telescopic arm device according to claim 1 or 2, characterized in that: The column is installed at the front end of the vehicle, and the height of the column is lower than the lower edge of the window at the front end of the vehicle.

4. The foldable telescopic arm device according to claim 1 or 2, characterized in that: The one end of the second supporting arm is connected to the other end of the first supporting arm at an inclined angle.

5. The foldable telescopic arm device according to claim 1 or 2, characterized in that: Both ends of the first telescopic cylinder are hinged between the inner side of one end of the second support arm and the column; the outer side of one end of the second support arm is hinged to the outer side of one end of the second telescopic cylinder, and the inner side refers to the side where the area surrounded by the folding and contraction of the first support arm, the second support arm, the middle hinge assembly, and the third support arm is as the inner side, and the opposite side is as the outer side.

6. The foldable telescopic arm device according to claim 5, characterized in that: The one end of the middle extension plate is located in a direction close to the one end of the second support arm relative to the other end thereof, and extends to the inner side; The one end of the head extension plate is located in a direction close to the third support arm base relative to the other end thereof and extends to the inside.

7. The foldable telescopic arm device according to claim 2, characterized in that: The middle hinge plate, the middle hinge plate bracket, the third support arm base and the middle extension plate are all two-piece, and the second telescopic cylinder and the second support arm are clamped and installed in the middle; The head hinge plate, the head hinge plate bracket, the functional equipment connecting bracket and the head extension plate are all of two-piece type, and the fourth telescopic cylinder and the third supporting arm are clamped in the middle for installation.

8. The foldable telescopic arm device according to claim 2, characterized in that: The sides of the middle hinged plate and the middle hinged plate bracket close to each other are in a concave arc shape; The side where the head hinge plate and the head hinge plate bracket are close to each other is in a concave arc shape.

9. The foldable telescopic arm device according to claim 3, characterized in that: It also includes a slide rail and a sliding bracket assembly. The slide rail is installed at the front end of the vehicle along the width direction of the vehicle. The sliding bracket assembly is slidably installed on the slide rail. The column is rotatably installed on the sliding bracket assembly. A swing cylinder and a connecting plate assembly are also installed on the sliding bracket assembly. The connecting plate assembly includes a first end and a second end. The first end is fixedly connected to the column, and the second end is hinged to one end of the swing cylinder. The other end of the swing cylinder is hinged to the sliding bracket assembly.

10. The foldable telescopic arm device according to claim 9, characterized in that: It also includes a recovery plate assembly, which is fixedly connected to the sliding bracket assembly and is used to support under the functional equipment connection bracket after the arm device is folded and contracted.

11. The foldable telescopic arm device according to claim 9, characterized in that: The hydraulic control system includes a first hydraulic pump, a second hydraulic pump, an electromagnetic relief valve and a working equipment driving member. The first hydraulic pump supplies oil to the operating equipment drive member, and the second hydraulic pump supplies oil to the first telescopic cylinder, the second telescopic cylinder, the third telescopic cylinder, the fourth telescopic cylinder, the swing cylinder, and the moving motor. An electromagnetic relief valve is connected to the oil outlet of the first hydraulic pump, and an electromagnetic relief valve is connected to the oil outlet of the second hydraulic pump.

12. The foldable telescopic arm device according to claim 11, characterized in that: A balancing valve is connected to the oil circuit of the rodless chamber of the first telescopic cylinder; The oil inlet and outlet of the second telescopic cylinder are both connected with a balancing valve; The oil circuit of the rod chamber of the third telescopic cylinder is connected with a balance valve; The oil circuit of the rod chamber of the fourth telescopic cylinder is connected with a balance valve.

13. The foldable telescopic arm device according to claim 11, characterized in that: A floating solenoid valve is connected to the oil circuit of the first telescopic cylinder, and a floating solenoid valve is also connected to the oil circuit of the fourth telescopic cylinder. Any floating solenoid valve includes two two-position two-way valves, one two-position two-way valve is connected between the oil inlet circuit of the telescopic cylinder and the hydraulic oil tank, and the other two-position two-way valve is connected between the oil outlet circuit of the telescopic cylinder and the hydraulic oil tank.

14. The foldable telescopic arm device according to claim 11, characterized in that: A swing safety overflow valve is connected to the oil outlet of the swing cylinder.

15. The foldable telescopic arm device according to claim 11, characterized in that: An oil cooler is connected to the oil return pipeline of the operating equipment drive component.

16. The foldable telescopic arm device according to claim 11, characterized in that: The hydraulic oil tank is integrated with an oil suction filter and an oil return filter. The oil return filter is arranged between the oil return main pipeline and the hydraulic oil tank. The return oil of the operating equipment driving parts, as well as the first telescopic cylinder, the second telescopic cylinder, the third telescopic cylinder, the fourth telescopic cylinder, the swing cylinder, and the mobile motor are converged into the oil return main pipeline and then returned to the hydraulic oil tank.

17. The foldable telescopic arm device according to claim 12, characterized in that: The balance valve of the first telescopic cylinder is also connected to the accumulator through a two-position two-way valve.

18. The foldable telescopic arm device according to claim 12, characterized in that: A two-position two-way valve is connected to the oil inlet of the swing cylinder. When the swing cylinder is in motion, the two-position two-way valve opens, and when the swing cylinder stops moving, the two-position two-way valve closes.

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