Folding telescopic boom device
By designing a folding telescopic boom device on the sanitation greening trimming vehicle, the problem of the boom occupying space was solved, enabling the equipment to operate with a wide working range and safety, simplifying installation and maintenance, and improving vehicle utilization efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-03
AI Technical Summary
The existing sanitation greening trimming vehicles have extended booms that occupy space in the truck bed and chassis, making the vehicles inconvenient to use and complex in structure, thus affecting operational efficiency.
Design a folding telescopic boom device, installed at the front of the vehicle, which extends to the working range when unfolded and retracts in front of the cab when folded, without occupying the truck bed and chassis space. The folding and retraction of the boom is achieved by using a multi-section telescopic cylinder and hinge assembly.
It enables safe and wide-ranging operation of the equipment. The equipment is compact when folded, does not affect vehicle driving safety, is easy to mount, does not occupy rear space of the vehicle, and simplifies installation and maintenance.
Smart Images
Figure CN224074407U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical equipment technology, and more specifically, relates to a folding telescopic boom device. Background Technology
[0002] Sanitation and greening trimming vehicles typically use telescopic booms to connect operating equipment. To achieve a wider operating range and cover a larger area, the boom must be extended. While extending the boom meets the requirements, it reduces vehicle volume. Generally, the extended greening equipment is placed and fixed in the vehicle's bed or mounted on a chassis. Mounting it in the bed directly reduces the bed's volume, decreasing the cargo capacity. Mounting it on the chassis complicates the chassis structure and makes installation, disassembly, operation, and maintenance inconvenient. Furthermore, the equipment may be damaged during vehicle movement. Additionally, mounting it on the chassis takes up space, making it difficult to install other equipment, thus limiting the vehicle's versatility and restricting its use to this specific 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 truck bed and does not need to be installed on the chassis. Utility Model Content
[0004] To address the above issues, this application provides a folding telescopic boom device that can be mounted on the front of a vehicle. When the boom is extended and retracted, the functional equipment connection assembly achieves an ideal working range with a wide field of vision, facilitating the operation of the equipment. After operation, the boom folds and retracts, placing it in front of the cab. It features a small size and low height when folded and retracted, ensuring that its lateral dimensions do not exceed the width of the cab and its height does not obstruct the cab window. The equipment is lightweight, and its mounting does not affect vehicle driving safety. The equipment is convenient to mount on the vehicle and does not occupy space in the rear cargo bed or chassis.
[0005] This application provides a folding telescopic boom device, comprising:
[0006] Columns;
[0007] A first support arm and a first telescopic cylinder, one end of the first support arm is hinged to the top 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] The second support arm and the second telescopic cylinder, wherein one end of the second support arm is hinged to one end of the second telescopic cylinder;
[0009] The central hinge assembly includes a central hinge plate, a central hinge plate bracket, a third support arm base, and a central extension plate. One end of the central hinge plate bracket is hinged to one end of the central hinge plate and the other end of the second telescopic cylinder. The other end of the central hinge plate bracket is hinged to one end of the third support arm base. A central extension plate is fixedly connected to the other end of the second support arm. One end of the central extension plate is hinged to the other end of the central hinge plate, and the other end of the central extension plate is hinged to the other end of the third support arm base.
[0010] The third support arm and the third telescopic cylinder are fixedly connected to the side of the base of the third support arm opposite to its two hinge points. The third support arm is a multi-section telescopic type. The side of the base of the third support arm opposite to its two hinge points is also hinged to one end of the third telescopic cylinder. 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 connection bracket is installed at the end of the multi-section telescopic structure of the third support arm and is used to connect with the functional equipment.
[0012] Optionally, it also includes a fourth telescopic cylinder and a head hinge assembly. The head hinge assembly includes a head hinge plate, a head hinge plate bracket, a functional equipment connection bracket, and a head extension plate. One end of the fourth telescopic cylinder is hinged to a telescopic joint of the third support arm. One end of the head hinge plate bracket is hinged to one end of the head hinge plate and the other end of the fourth telescopic cylinder. The other end of the head hinge plate bracket is hinged to one end of the functional equipment connection bracket. One end of the head extension plate is hinged to the other end of the head hinge plate, and the other end of the head extension plate is hinged to the other end of the functional equipment connection bracket.
[0013] Optionally, the pillar is installed at the front of the vehicle, and the height of the pillar is lower than the lower edge of the front window of the vehicle.
[0014] Optionally, one end of the second support arm is connected to the other end of the first support arm at an inclined angle.
[0015] Optionally, the two 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. The inner side refers to the side where the area enclosed by the folded and retracted first support arm, second support arm, middle hinge assembly and third support arm is located, while the opposite side is located as the outer side.
[0016] Optionally, one end of the central extension plate is positioned relative to its other end toward the end of the second support arm and extends inward.
[0017] One end of the head extension plate is positioned relative to its other end toward the base of the third support arm and extends inward.
[0018] Optionally, the middle hinge plate, the middle hinge plate bracket, the third support arm base, and the middle extension plate are all two-piece designs, with the second telescopic cylinder and the second support arm clamped in the middle for installation.
[0019] The head hinge plate, head hinge plate bracket, functional equipment connection bracket, and head extension plate are all two-piece designs, with the fourth telescopic cylinder and the third support arm clamped in the middle for installation.
[0020] Optionally, the middle hinge plate and the middle hinge plate bracket have a concave arc shape on the side that is close to each other;
[0021] The head hinge plate and the head hinge plate bracket are concave arc-shaped on the side that are close to each other.
[0022] Optionally, 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, and the column is rotatably installed on the sliding bracket assembly.
[0023] Optionally, a recovery plate assembly is also included, which is fixedly connected to the sliding support assembly for supporting the functional equipment connection bracket below after the boom assembly is folded and retracted.
[0024] Compared with the prior art, this application has the following advantages:
[0025] The folding telescopic boom device of this application can be installed at the front of the vehicle, so it will not occupy the space in the rear truck bed. Moreover, when connected to, for example, snow removal and de-icing vehicles, since snow removal and de-icing vehicles are usually connected to detachable snowplows and other operating equipment via mounting connection points, the folding telescopic boom device can share the connection structure of the snow removal and de-icing equipment. The equipment is easy to install on the vehicle, does not occupy the rear truck bed space or chassis space, and avoids other unnecessary connection structure costs.
[0026] After the folding telescopic boom device of this application is unfolded, the functional head of the working equipment can reach the ideal working range, and its working field of vision is wide, which is conducive to the operation of the equipment. After the operation is completed, the boom is folded and retracted and placed in front of the cab. After folding and retracting, it is small in size and low in height. Its volume will not exceed the width of the cab on the left and right, and its height will not cover the cab glass. The equipment mounting will not affect the driving safety of the vehicle. Attached Figure Description
[0027] Figure 1 This is a perspective view of the folding telescopic boom device described in an embodiment of the present utility model;
[0028] Figure 2 This is a schematic diagram illustrating the unfolding and retraction of the central hinge assembly as described in an embodiment of the present invention.
[0029] Figure 3 This is a schematic diagram illustrating the unfolding and retraction of the folding telescopic boom device described in this embodiment of the present invention.
[0030] Figure label:
[0031] 1. Swing cylinder; 2. Connecting plate assembly; 3. Sliding bracket assembly; 4. Retraction plate assembly; 5. Slide rail frame assembly; 6. Vehicle connection assembly; 7. Column; 8. First telescopic cylinder; 9. First support arm; 10. Second telescopic cylinder; 11. Middle hinge plate; 12. Middle hinge plate bracket; 13. Third support arm base; 14. Third telescopic cylinder; 15. Fourth telescopic cylinder; 16. Head hinge plate; 17. Head hinge plate bracket; 18. Functional equipment connection bracket; 19. Functional equipment connection assembly; 20. Second support arm; 21. Middle extension plate; 22. Connecting clamp plate; 23. Head extension plate; 24. Detailed Implementation
[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0033] In the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the components can rotate relative to each other after connection. The directional terms mentioned in the embodiments of this application, such as "front," "rear," "inner side," "outer side," "middle," "clockwise," "counterclockwise," "vertical," "horizontal," and "top," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. The phrase "two components obtain an integrated structure through an integral molding process" means that during the formation of one of the two components, that component is connected to the other component without requiring further processing (such as bonding, welding, snap-fit connection, or screw connection) to connect the two components together.
[0034] In the embodiments of this application, terms such as "first" and "second" are used to distinguish identical or similar items with substantially the same function and effect. For example, "first support arm" and "second support arm" are used only to distinguish different support arms and do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that "first" and "second" do not necessarily imply that they are different.
[0035] Please refer to Figure 1 , Figure 2 The folding telescopic boom 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 hinge assembly, a third support arm base 13, a third telescopic cylinder 14, a third support arm 15, a fourth telescopic cylinder 16, a head hinge assembly, a functional equipment connecting bracket 19, and a functional equipment connecting assembly 20.
[0036] The pillar 7 is installed vertically at the front of the vehicle, and its height should be lower than the lower edge of the windshield so as not to obstruct the driver's view while driving. The pillar 7 can be columnar, such as a cylinder or a tube.
[0037] One end of the first support arm 9 is hinged to the top of the column via a horizontal hinge point. 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 clamp 23. The connecting clamp 23 is T-shaped and fixedly connected to the second support arm 21. The connecting clamp 23 comprises two spaced-apart plates. The inner side of the connecting clamp 23 is hinged to one end of the first telescopic cylinder 8 via a first hinge point. The other end of the first telescopic cylinder 8 is hinged to the inner side of the column 7 via a horizontal hinge point. The lifting and lowering of the boom is controlled by the extension and retraction of the first telescopic cylinder 8. Figure 1 In the middle, the first telescopic cylinder 8 extends, the first support arm 9 rotates clockwise around the hinge point with the top of the column to lift, the first telescopic cylinder 8 retracts, and the first support arm 9 rotates counterclockwise around the hinge point with the top of the column to lower.
[0038] It should be noted that the inner side refers to the area enclosed by the retracted first support arm 9, second support arm 21, middle hinge assembly, and third support arm 15, while the opposite side is referred to as the outer side.
[0039] The outer side of the connecting clamp 23 is hinged to one end of the second telescopic cylinder 10 via a hinge point. The other end of the second telescopic cylinder 10 is connected to the central hinge assembly. By extending and retracting the second telescopic cylinder, the central hinge assembly can be controlled to unfold and fold. Specifically, the central hinge assembly includes a central hinge plate 11, a central hinge plate bracket 12, a third support arm base 13, and a central extension plate 22. One end of the central hinge plate bracket 12 is hinged to one end of the central hinge plate 11 and the other end of the second telescopic cylinder 10. The other end of the central hinge plate bracket 12 is hinged to one end of the third support arm base 13 via a hinge point.
[0040] A central extension plate 22 is fixedly connected to the end of the second support arm 21. One end of the central extension plate 22 is hinged to the other end of the central hinge plate 11, and the other end of the central extension plate 22 is hinged to the other end of the third support arm base 13 via a hinge point. Furthermore, in some embodiments, one end of the central extension plate 22 is positioned relative to its other end towards the connecting clamp 23 and extends inwards; the hinge point between the central hinge plate 11 and the central extension plate 22 is located inwards. This layout helps to achieve a smaller space occupation form as shown by the dashed line when finally retracted. It should be noted that the central extension plate can be integrally formed with the second support arm or installed at its end by fasteners. Moreover, the central extension plate is not mandatory; the central hinge plate 11 and the third support arm base 13 can be hinged to different positions at the end of the second support arm 21.
[0041] In some embodiments, the central hinge plate 11, the central hinge plate bracket 12, the third support arm base 13, and the central extension plate can all be two-piece designs, with the second telescopic cylinder 10 and the second support arm 21 clamped in the middle for installation.
[0042] In some embodiments, the central hinge plate 11 and the central hinge plate support 12 can both have a certain curvature. Specifically, the side of the central hinge plate 11 and the central hinge plate support 12 that is close to each other has a concave curvature. In this way, during the retraction of the central hinge assembly, the concave curvature can provide a certain amount of clearance, allowing the central hinge assembly to have a larger retraction range.
[0043] like Figure 2In the diagram, the solid line represents the state when the central hinge assembly is extended, and the dashed line represents the state when the central hinge assembly is retracted. As shown by the solid line, when the second telescopic cylinder 10 retracts, the central hinge plate 11 rotates clockwise around its hinge point with the central extension plate 22, thereby pulling the central hinge plate bracket 12, which is hinged to it, to rotate clockwise. The rotation of the central hinge plate bracket 12, in turn, pulls 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 central extension plate 22, thus forming an extended form. At this time, the third support arm 15 is facing diagonally upward.
[0044] As shown by the dotted line, when the second telescopic cylinder 10 extends, the middle hinge plate 11 rotates counterclockwise around its hinge point with the middle extension plate 22, thereby pushing the middle hinge plate bracket 12, which is hinged to it, to rotate counterclockwise. The rotation of the middle hinge plate bracket 12 in turn pushes 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 retracted form. At this time, the third support arm 15 is in a state of facing obliquely downward.
[0045] The third support arm 15 is fixedly connected to the side of the third support arm base 13 opposite to its two hinge points. The third support arm 15 can be a multi-section telescopic structure. For example, it can include multiple telescopic sections that are sequentially nested inside and out. One end of the third telescopic cylinder 14 is also hinged to the side of the third support arm base 13 opposite to its two hinge points. 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 extends, the third support arm extends; when the third telescopic cylinder 14 retracts, the third support arm shortens.
[0046] Furthermore, a head hinge assembly and a fourth telescopic cylinder 16 are also connected to the third support arm 15. The head hinge assembly has a similar structure to the middle hinge assembly. Specifically, it includes a head hinge plate 17, a head hinge plate bracket 18, a functional equipment 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. The other end of the head hinge plate bracket 18 is hinged to one end of the functional equipment 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 equipment connection bracket 19.
[0047] In some embodiments, one end of the head extension plate 24 is positioned relative to its other end toward the third support arm base 13 and extends inward, with the hinge point between the head hinge plate 17 and the head extension plate 24 located inward. This layout helps to achieve a smaller footprint when retracted. It should be noted that the head extension plate can be integrally formed with the third support arm 15 or mounted on its end using fasteners. Furthermore, the head extension plate is not mandatory; the head hinge plate 17 and the functional device connecting bracket 19 can also be hinged at different positions at the end of the third support arm 15.
[0048] In some embodiments, the head hinge plate 17, the head hinge plate bracket 18, the functional device connection bracket 19, and the head extension plate can all be two-piece designs, with the fourth telescopic cylinder 16 and the third support arm 15 clamped in the middle for installation.
[0049] In some embodiments, the head hinge plate 17 and the head hinge plate bracket 18 can both have a certain curvature. Specifically, the side of the head hinge plate 17 and the head hinge plate bracket 18 that is close to each other has a concave curvature. In this way, during the retraction of the head hinge assembly, the concave curvature can provide a certain amount of clearance, allowing the head hinge assembly to have a larger retraction range.
[0050] It should be noted that the function of the middle hinge assembly is to allow the third support arm to be raised and lowered, while the function of the head hinge assembly is to adjust the direction of the functional equipment connection assembly 20, that is, to adjust the direction of the functional equipment to suit the operation of the functional equipment.
[0051] The functional equipment connecting bracket 19 and the functional equipment connecting assembly 20 are connected. The functional equipment connecting assembly 20 is used to install various operational equipment, such as a pruning machine, which can lift and unfold the folding telescopic boom device to prune branches and leaves at higher locations. The functional equipment connecting bracket 19 and the functional equipment connecting assembly 20 can be integrated or detachably connected. Alternatively, the functional equipment connecting bracket 19 itself can have the function of connecting functional equipment, without the functional equipment connecting assembly 20.
[0052] The folding telescopic boom device of this embodiment designs the support arm into two sections with bending angles: the first support arm and the second support arm. The clever and reasonable design of the cylinder fulcrum and hinge structure allows the entire boom to be folded within a very small volume, resulting in a lightweight device. It can be easily mounted at the front of the vehicle without occupying other space on the vehicle. The wide field of vision facilitates operation.
[0053] In some embodiments, the included angle between the inner sides of the first support arm 9 and the second support arm that are fixedly connected should be appropriately selected so that when the first telescopic cylinder retracts, the second telescopic cylinder 10 extends, and the third telescopic cylinder retracts and the fourth telescopic cylinder extends, the support arm can be folded and retracted to a size not exceeding the width of the vehicle. For example, the included angle is greater than 90 degrees and less than 150 degrees.
[0054] In some embodiments, the system further includes a sliding bracket assembly 3, a slide rail frame assembly 5, and a vehicle connection assembly 6.
[0055] The slide rail frame assembly 5 is installed at the front end of the vehicle and is a frame structure including at least one slide rail. However, using two slide rails is more stable, and this embodiment uses two parallel slide rails. The two parallel slide rails can be connected as a whole by connectors to form the slide rail frame assembly 5 in the form of a frame. The two parallel slide rails are horizontal or approximately horizontal. For example, the two parallel slide rails can be made of angle steel, with the right-angled face 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 rails are arranged along the width direction of the vehicle, and the front end serves as the sliding contact surface of the slide rails.
[0056] A vehicle connection assembly 6 is fixedly connected to the slide rail frame assembly 5. The vehicle connection assembly 6 is used to connect to the hook structure at the front of the vehicle cab. The vehicle connection assembly 6 may have a connection structure adapted to the hook structure. For example, a hook may be provided at the front of the cab, and a through hole may be 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 of the vehicle cab by binding or fastening. Alternatively, the vehicle connection assembly 6 may be directly connected to the front of the vehicle by fasteners, or even welded to the front of the vehicle.
[0057] 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, thereby adjusting the position of the sliding bracket assembly 3 in the width direction of the vehicle to adapt to its working position requirements.
[0058] In some embodiments, the column is rotatably mounted on a sliding bracket assembly, which also houses a swing cylinder and a connecting plate assembly. The connecting plate assembly 2 is plate-shaped, comprising 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, while the other end of the swing cylinder is hinged to the sliding bracket assembly. The extension and retraction of the swing cylinder 1 drives the column 7 to rotate, thereby adjusting the first support arm mounted at its top to a suitable position. For example, during operation, the swing cylinder 1 drives the connecting plate assembly 2 to swing 30°, which means the first support arm swings 30° to match the operation position. After the operation is completed, the swing cylinder drives the first support arm to swing to a vertical plane parallel to the vehicle's width direction, allowing it to retract and fold at the front of the vehicle.
[0059] In some embodiments, a retraction plate assembly 4 is also included, which is fixedly connected to the sliding bracket assembly 3 and extends horizontally or substantially horizontally toward the side where the support arm is located, for supporting the functional device connection assembly 20 of the retracted and folded support arm.
[0060] The folding telescopic boom device is mounted on the front of the vehicle via the vehicle connection assembly 6. During operation, the functional equipment connection assembly 20 is connected to the functional equipment, the first telescopic cylinder 8 extends, and the first support arm 9 is raised. Then, the second telescopic cylinder 10 retracts, and the middle hinge assembly unfolds, raising the third support arm 15. Then, the third telescopic cylinder 14 extends, and the third support arm extends. Then, the fourth telescopic cylinder 16 extends to control the head hinge assembly, thereby adjusting the working angle of the functional equipment. Then, the swing cylinder 1 extends, and the column 7 swings circumferentially in front of the cab to adjust the boom's working angle, after which the functional equipment can be used for operation.
[0061] After the operation is completed, the swing cylinder 1 drives the column to rotate, causing the support arm to rotate into the vertical plane in the vehicle width direction. The fourth telescopic cylinder 16 retracts, followed by the third telescopic cylinder 14, shortening the third support arm. Then, the second telescopic cylinder 10 extends, causing the middle hinge assembly to retract, thereby causing the third support arm 15 to swing down. The first telescopic cylinder 8 retracts, and the functional equipment connection assembly 20 moves back to rest on the recovery plate assembly 4, completing the folding and recovery of the entire boom. The recovery plate assembly supports the entire boom and functional head, preventing the boom from falling if the telescopic cylinder fails.
[0062] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications all fall within the protection scope of the claims of this utility model.
Claims
1. A folding jib device, characterised in that, The utility model relates to a folding device for vehicle, comprising: a stand; a first support arm and a first telescopic cylinder, one end of the first support arm is hinged to the top end of the stand, the other end of the first support arm is fixedly connected to one end of a second support arm, and the two ends of the first telescopic cylinder are hinged between the one end of the second support arm and the stand; a second support arm and a second telescopic cylinder, the one end of the second support arm is hinged to one end of the second telescopic cylinder; a middle hinge assembly, comprising a middle hinge plate, a middle hinge plate support, a third support arm base, and a middle extension plate, one end of the middle hinge plate support is hinged to one end of the middle hinge plate and the other end of the second telescopic cylinder, the other end of the middle hinge plate support is hinged to one end of the third support arm base, the other end of the second support arm is fixedly connected to the middle extension plate, one end of the middle extension plate is hinged to the other end of the middle hinge plate, and the other end of the middle extension plate is hinged to the other end of the third support arm base; a third support arm and a third telescopic cylinder, the third support arm base is fixedly connected to the third support arm on the side opposite to the two hinge points, the third support arm is telescopic, the third support arm base is further hinged to one end of the third telescopic cylinder on the side opposite to the two hinge points, and the other end of the third telescopic cylinder is hinged to the end of the telescopic structure of the third support arm; a functional device connecting support is installed at the end of the telescopic structure of the third support arm, and is used for being connected with the functional device.
2. The folding boom device of claim 1, wherein, Further comprising a fourth telescopic cylinder and a head hinge assembly, the head hinge assembly comprises a head hinge plate, a head hinge plate support, the functional device connecting support, and a head extension plate, one end of the fourth telescopic cylinder is hinged to one telescopic section of the third support arm, one end of the head hinge plate support is hinged to one end of the head hinge plate and the other end of the fourth telescopic cylinder, the other end of the head hinge plate support is hinged to one end of the functional device connecting support, one end of the head extension plate is hinged to the other end of the head hinge plate, and the other end of the head extension plate is hinged to the other end of the functional device connecting support.
3. A folding jib device according to claim 1 or 2, wherein, The stand is installed at the front end of the vehicle, and the height of the stand is lower than the lower edge of the front window of the vehicle.
4. A folding jib device according to claim 1 or 2, wherein, The one end of the second support arm is connected to the other end of the first support arm at an inclined angle.
5. A folding jib device according to claim 1 or 2, wherein, The two ends of the first telescopic cylinder are hinged between the inner side of the one end of the second support arm and the stand, the outer side of the one end of the second support arm is hinged to the outer side of the one end of the second telescopic cylinder, the inner side refers to the side of the region surrounded by the first support arm, the second support arm, the middle hinge assembly, and the third support arm as the inner side, and the opposite side as the outer side.
6. The folding boom device of claim 5, wherein, The one end of the middle extension plate is located in the direction close to the one end of the second support arm relative to the other end, and extends to the inner side. The one end of the head extension plate is located in the direction close to the third support arm base relative to the other end, and extends to the inner side.
7. The folding boom device of claim 2, wherein, The middle hinge plate, the middle hinge plate support, the third support arm base, and the middle extension plate are two-piece type, and the second telescopic cylinder and the second support arm are clamped and installed in the middle. The head articulating plate, the head articulating plate support, the functional equipment connecting support and the head extension plate are all two-piece type, and the fourth telescopic cylinder and the third supporting arm are clamped in the middle.
8. The folding boom device of claim 2, wherein, The middle articulating plate and the middle articulating plate support are recessed and arc-shaped on the side close to each other. The head articulating plate and the head articulating plate support are recessed and arc-shaped on the side close to each other.
9. A folding jib device according to claim 1 or 2, wherein, The slide rail is installed on the front end of the vehicle along the vehicle width direction, the slide support assembly is slidably installed on the slide rail, and the stand is rotatably installed on the slide support assembly.
10. The folding boom device of claim 9, wherein, The recycling plate assembly is fixedly connected to the slide support assembly and is used for supporting under the functional equipment connecting support after the arm support device is folded and contracted.