Boom parallel connecting rod luffing mechanism

Abstract

The utility model discloses a boom parallel connecting rod luffing mechanism, and relates to the technical field of booms. In the luffing mechanism, the second end of a lifting arm is rotationally connected with a first hinge point of a connecting base, and the second end of a lower pull rod is rotationally connected with a second hinge point of the connecting base. A tool cavity is formed in the rotary table structural part and used for detachably installing a supporting tool, and the supporting tool can support a lower pull rod located at a preset installation angle with the rotary table structural part. The variable-amplitude oil cylinder is rotationally connected with a fourth hinge point of the connecting seat; the synchronous pull rod is rotationally connected with a fifth hinge point of the lifting arm; a mounting hole is formed in the connecting base in a penetrating mode, when the lifting arm and the rotary table structural part are located at a preset mounting angle, the fifth hinge point is exposed out of the mounting hole, the fifth hinge point, the first hinge point and the fourth hinge point are sequentially arranged in the direction close to the first end of the lifting arm, and the first rotating shaft can be connected with the synchronous pull rod and the fifth hinge point through the mounting hole. According to the luffing mechanism, the upper and lower sub-module assembly of the parallel connecting rod luffing mechanism of the boom can be realized, and the assembly difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boom trucks, in particular to a boom truck parallel connecting rod luffing mechanism. Background Art

[0002] One existing boom trolley luffing mechanism is a parallel-link mechanism. Compared to traditional boom trolley mechanisms like three-hinge and four-link mechanisms, this mechanism can achieve a higher boom height with the same luffing cylinder stroke. However, the large number of hinge points in this mechanism complicates assembly.

[0003] Therefore, how to provide a boom truck parallel link luffing mechanism that is easy to assemble is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide a boom truck parallel link luffing mechanism that is easy to assemble.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A boom truck parallel-link luffing mechanism comprises a lifting arm, a lower pull rod, a connecting seat, a turntable structure, an arm, a luffing cylinder and a synchronous pull rod; the lower pull rod is arranged below the lifting arm, the first end of the lifting arm and the first end of the lower pull rod are respectively rotatably connected to the turntable structure, the second end of the lifting arm is rotatably connected to the first hinge point of the connecting seat, and the second end of the lower pull rod is rotatably connected to the second hinge point of the connecting seat, the lifting arm, the turntable structure, the lower pull rod and the connecting seat form a parallelogram linkage mechanism; the turntable structure has a tooling cavity for detachably installing a supporting tooling, and the supporting tooling can support the turntable structure at a preset installation angle. The lower pull rod at the lower degree; one end of the arm is rotated to connect the third hinge of the connecting seat, one end of the variable amplitude cylinder is rotated to connect the arm, and the other end is rotated to connect the fourth hinge of the connecting seat, one end of the synchronous pull rod is rotated to connect the arm, and the other end is rotated to connect the fifth hinge of the lifting arm; a mounting hole is set through the connecting seat, and when the lifting arm and the turntable structure are at the preset mounting angle, the fifth hinge is exposed from the mounting hole, and the fifth hinge, the first hinge and the fourth hinge are arranged in sequence along the direction close to the first end of the lifting arm, and the first rotating shaft can connect the synchronous pull rod and the fifth hinge through the mounting hole.

[0007] Preferably, the connecting seat includes a connecting plate and two first side plates arranged along the width direction, the connecting plate is fixed to the edges of the two first side plates away from the first ends of the lifting arms, and an installation space is formed between the two first side plates, the first side plates include an upper side plate portion, a transition inclined plate portion and a lower side plate portion arranged in sequence from top to bottom, each of the upper side plate portions and each of the lower side plate portions are arranged in parallel, the spacing between the transition inclined plate portions of the two first side plates gradually increases from top to bottom, and the spacing between the upper side plate portions of the two first side plates is smaller than the spacing between the lower side plate portions of the two first side plates;

[0008] The second end of the lower pull rod extends into the installation space and is rotatably connected to the lower side plate portion through a second rotating shaft.

[0009] Preferably, the boom, the luffing cylinder, and the lifting arm all extend into the installation space and are rotatably connected to the upper side plate;

[0010] The mounting hole is opened in the upper side plate portion of the first side plate, and the synchronous pull rod extends into the mounting space.

[0011] Preferably, it also includes a leveling cylinder extending into the installation space, one end of the leveling cylinder is rotatably connected to the arm, and the other end is rotatably connected to the sixth hinge point of the connecting seat, and the sixth hinge point is provided on the upper side plate.

[0012] Preferably, when the lifting arm and the turntable structure are at the preset installation angle, the sixth hinge point, the fifth hinge point, the first hinge point and the fourth hinge point are arranged in sequence along the direction close to the first end of the lifting arm.

[0013] Preferably, the first side plate is bent in two steps to form the upper side plate portion, the transition inclined plate portion and the lower side plate portion.

[0014] Preferably, a first reinforcing plate is fixedly provided on the side surface of the upper side plate in the width direction, away from the edge of the connecting plate, to form a side plate reinforcement area of ​​the upper side plate, and the lifting arm, the boom, and the boom cylinder are all rotatably connected to the side plate reinforcement area.

[0015] Preferably, a first rotation limiting groove is provided on the outer surface of the lower side plate portion on one of the first side plates, a second baffle is fixedly provided at one end of the second rotating shaft, and the second baffle is clamped in the first rotation limiting groove to prevent the second rotating shaft from rotating relative to the connecting seat.

[0016] Preferably, the lifting arm includes two second side plates arranged in sequence along the width direction; the second ends of the two second side plates are fixedly provided with a first mounting tube that passes through the width direction, and the first ends are fixedly provided with a second mounting tube that passes through the width direction; a first sealing plate is fixedly provided between the two second side plates, the first sealing plate extends from the first mounting tube to the second mounting tube, a third rotating shaft is provided in the first mounting tube to rotatably connect the connecting seat, and a fourth rotating shaft is provided in the second mounting tube to rotatably connect the turntable structure; a second reinforcing plate is provided on the outer side surface of the second end of the second side plate in the width direction, a third reinforcing plate is provided on the outer side surface of the first end of the second side plate in the width direction, the second mounting tube protrudes from the third reinforcing plate in the width direction, and a first reinforcing rib is also fixedly provided between the second mounting tube and the third reinforcing plate.

[0017] Preferably, the lifting arm has a second rotation limiting groove on an outer side in the width direction, and a first baffle is fixedly provided on one end of the first rotating shaft, and the first baffle is clamped in the second rotation limiting groove to prevent the first rotating shaft from rotating relative to the lifting arm.

[0018] The utility model provides a boom truck parallel link luffing mechanism, including a lifting arm, a lower pull rod, a connecting seat, a turntable structure, an arm frame, a luffing oil cylinder and a synchronous pull rod; the lower pull rod is arranged below the lifting arm, the first end of the lifting arm and the first end of the lower pull rod are respectively rotatably connected to the turntable structure, the second end of the lifting arm is rotatably connected to the first hinge point of the connecting seat, and the second end of the lower pull rod is rotatably connected to the second hinge point of the connecting seat, the lifting arm, the turntable structure, the lower pull rod and the connecting seat form a parallelogram linkage mechanism; the turntable structure has a tooling cavity for detachably installing a supporting tooling, and the supporting tooling can support and rotate The platform structure is at a preset installation angle, and the lower pull rod; one end of the arm rotates to connect the third hinge point of the connecting seat, one end of the variable amplitude cylinder rotates to connect the arm, and the other end rotates to connect the fourth hinge point of the connecting seat, one end of the synchronous pull rod rotates to connect the arm, and the other end rotates to connect the fifth hinge point of the lifting arm; a mounting hole is provided through the connecting seat, and when the lifting arm and the turntable structure are at a preset installation angle, the fifth hinge point is exposed from the mounting hole, and the fifth hinge point, the first hinge point, and the fourth hinge point are arranged in sequence along the direction close to the first end of the lifting arm, and the first rotating shaft can be connected to the synchronous pull rod and the fifth hinge point through the mounting hole.

[0019] Based on the arrangement of the hinge points of the boom truck's parallel-link luffing mechanism, during installation, the lifting arm, turntable structure, lower pull rod, and connecting seat can be connected together to form a parallelogram linkage mechanism. Afterwards, since there is a tooling cavity in the turntable structure, a supporting tooling can be placed in the tooling cavity in the turntable structure to support the lower pull rod. At this time, the lifting arm and the lower pull rod are maintained at a preset installation angle with the turntable structure, and then the luffing cylinder is connected to the fourth hinge point of the connecting seat. At this time, since the fifth hinge point, the first hinge point, and the fourth hinge point are staggered, the luffing cylinder can be placed above the lifting arm and will not block the fifth hinge point. After connecting the boom and the synchronous pull rod, it is lifted above the parallelogram linkage mechanism and connected to the boom. At this time, the bottom end of the synchronous pull rod is located near the fifth hinge point, and it can be operated at the mounting hole of the connecting seat to complete the connection between the synchronous pull rod and the lifting arm. After connecting the luffing cylinder and the boom, the supporting tooling is removed to complete the assembly of the entire machine.

[0020] Since there is a tooling cavity in the turntable structure for installing supporting tooling, the position of the parallelogram linkage formed by the lifting arm, turntable structure, lower pull rod and connecting seat can be limited, and the positional relationship of the fifth hinge point on the lifting arm and the first and fourth hinge points on the connecting seat can be limited, and the connecting seat is provided with a mounting hole to provide a basis for the subsequent installation of the boom and the synchronous pull rod. The upper and lower modular assembly of the boom car's parallel link amplitude adjustment mechanism can be realized, which reduces the difficulty of assembly and can meet the needs of mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 This is a front view of a specific embodiment 1 of the boom truck parallel link luffing mechanism provided by the utility model when the boom is horizontal;

[0023] Figure 2 This is a rear view of a specific embodiment 1 of the boom truck parallel link luffing mechanism provided by the present invention when the boom is horizontal;

[0024] Figure 3 This is a front view of a specific embodiment 1 of the boom truck parallel link luffing mechanism provided by the present invention when the boom is raised;

[0025] Figure 4 This is a side view of the connecting seat in the first specific embodiment of the boom truck parallel link luffing mechanism provided by the present invention;

[0026] Figure 5 This is a structural diagram of the connecting seat in the first specific embodiment of the boom truck parallel link luffing mechanism provided by the present invention;

[0027] Figure 6 This is a structural diagram of the synchronous pull rod in the first specific embodiment of the boom truck parallel link luffing mechanism provided by the present utility model;

[0028] Figure 7 This is a structural diagram of the lower pull rod in the first specific embodiment of the boom truck parallel link luffing mechanism provided by the present utility model;

[0029] Figure 8 This is a structural diagram of the lifting arm in the first specific embodiment of the boom truck parallel link luffing mechanism provided by the present invention.

[0030] Reference numerals:

[0031] Connecting seat 1, first side plate 11, upper side plate portion 111, transition inclined plate portion 112, lower side plate portion 113, connecting plate 12, mounting hole 13, first reinforcing plate 14, first rotation limiting groove 15, mounting space 16, first hinge point D, second hinge point F, third hinge point A, fourth hinge point E, sixth hinge point b;

[0032] Synchronous pull rod 2, third side plate 21, third mounting tube 22, fourth mounting tube 23, second sealing plate 24, fourth reinforcing plate 25, second reinforcing rib 26;

[0033] Lower pull rod 3, connecting rod 31, side rod 32, fifth reinforcing plate 33, sixth reinforcing plate 34, second rotating shaft 35, second baffle 36;

[0034] Lifting arm 4, second side plate 41, first mounting tube 42, second mounting tube 43, first sealing plate 44, second reinforcing plate 45, third reinforcing plate 46, first reinforcing rib 47, second rotation limiting groove 48, first rotating shaft 49, first baffle 491, fifth hinge point C;

[0035] Leveling cylinder 5;

[0036] Luffing cylinder 6;

[0037] Boom 7, tenth hinge point B, eleventh hinge point a;

[0038] Turntable structure 8, tooling cavity 81, seventh hinge point G, eighth hinge point H;

[0039] Support tooling 9. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0041] The core of the utility model is to provide a boom truck parallel link luffing mechanism, which is easy to assemble.

[0042] For the specific embodiment 1 of the boom truck parallel link luffing mechanism provided by the present invention, please refer to Figures 1 to 8 , including a lifting arm 4, a lower pull rod 3, a connecting seat 1, a turntable structure 8, a boom 7, a luffing cylinder 6 and a synchronous pull rod 2.

[0043] The lower link 3 is located below the lifting arm 4. The first end of the lifting arm 4 is pivotally connected to the seventh hinge point G of the turntable structure 8, while the first end of the lower link 3 is pivotally connected to the eighth hinge point H of the turntable structure 8. The second end of the lifting arm 4 is pivotally connected to the first hinge point D of the connecting base 1, and the second end of the lower link 3 is pivotally connected to the second hinge point F of the connecting base 1. The hinge points of the lower link 3 and the lifting arm 4 are of the same length (the length of line segment DG = the length of line segment FH). This ensures that the connecting base 1 remains vertically downward during the up-and-down movement, that is, the connecting base 1 moves horizontally and vertically. At this point, the lifting arm 4, turntable structure 8, lower link 3, and connecting base 1 form a parallelogram linkage (G, H, F, D). During operation, the lifting arm 4 and lower link 3 can rotate about hinge points G and H, respectively.

[0044] The turntable structure 8 has a tool cavity 81 for detachably installing a support tool 9, which can support the lower pull rod 3 at a preset installation angle with the turntable structure 8. Figure 1 and Figure 2 At this time, the lower pull rod 3 and the turntable structure 8 are considered to be at a preset installation angle. At the same time, the lifting arm 4 and the turntable structure 8 are also at a preset installation angle.

[0045] The support fixture 9 can be a support block of suitable height. When installed in the fixture cavity 81 of the turntable structure 8, to avoid affecting the structure of the turntable structure 8, it can be placed solely in the fixture cavity 81 without being connected to the turntable structure 8. Of course, the connection can also be detachable as needed. In addition, the fixture cavity 81 is an open-top structure, and can be directly selected from the space already provided in the turntable structure 8 or a separate space.

[0046] One end of the boom 7 is pivotally connected to the third hinge point A of the connecting base 1. One end of the luffing cylinder 6 is pivotally connected to the boom 7, and the other end is pivotally connected to the fourth hinge point E of the connecting base 1. One end of the synchronizing rod 2 is pivotally connected to the tenth hinge point B of the boom 7, and the other end is pivotally connected to the fifth hinge point C of the lifting arm 4. During operation, the boom 7 is driven up and down via hinge points A and E and the luffing cylinder 6. When the boom 7 is raised, the lifting arm 4 is pulled up via the synchronizing rod 2, thereby driving the luffing mechanism.

[0047] The connecting seat 1 is provided with a mounting hole 13. Figure 1 As shown, when the lifting arm 4 and the turntable structure 8 are at a preset installation angle, the fifth hinge point C is exposed from the installation hole 13, and the fifth hinge point C, the first hinge point D, and the fourth hinge point E are along the first end ( Figure 1 The first rotating shaft 49 can be connected to the fifth hinge point C of the synchronous pull rod 2 and the lifting arm 4 through the mounting hole 13 to realize the rotation connection between the synchronous pull rod 2 and the lifting arm 4.

[0048] Based on the hinge point arrangement of the boom truck's parallel link luffing mechanism, during installation, the lifting arm 4, turntable structure 8, lower pull rod 3, and connecting seat 1 can be connected together to form a parallelogram linkage mechanism. Afterwards, since the turntable structure 8 has a tooling cavity 81, a supporting tool 9 can be placed in the tooling cavity 81 in the turntable structure 8 to support the lower pull rod 3. At this time, the lifting arm 4 and the lower pull rod 3 are maintained at a preset installation angle with the turntable structure 8, and then the luffing cylinder 6 is connected to the fourth hinge point E of the connecting seat 1. At this time, since the fifth hinge point C, the first hinge point D, and the fourth hinge point E are staggered, the boom cylinder 6 can be placed above the lifting arm 4 without blocking the fifth hinge point C. After connecting the arm 7 to the synchronous rod 2, it is lifted above the parallelogram linkage mechanism and the arm 7 is connected to the connecting seat 1. At this time, the bottom end of the synchronous rod 2 is located near the fifth hinge point C, and it can be operated at the mounting hole 13 of the connecting seat 1 to complete the connection between the synchronous rod 2 and the lifting arm 4. After connecting the boom cylinder 6 and the arm 7, the supporting tooling 9 is removed to complete the assembly of the entire machine.

[0049] The parallel-link variable-length mechanism of the boom truck in this embodiment has a tooling cavity 81 in the turntable structure 8 for installing the supporting tooling 9, which can limit the position of the parallelogram linkage mechanism formed by the lifting arm 4, the turntable structure 8, the lower pull rod 3, and the connecting seat 1, and limit the positional relationship between the fifth hinge point C on the lifting arm 4 and the first hinge point D and the fourth hinge point E on the connecting seat 1. The connecting seat 1 is provided with a mounting hole 13 to provide a basis for the subsequent installation of the boom 7 and the synchronous pull rod 2. The parallel-link variable-length mechanism of the boom truck can be assembled in upper and lower modules, which reduces the difficulty of assembly and can meet the needs of mass production.

[0050] In the connector 1, Figure 4 and Figure 5 As shown, the connecting base 1 includes a connecting plate 12 and two first side plates 11 arranged along the width direction. It should be noted that in this embodiment, the width directions of the components are parallel. The connecting plate 12 is fixed to the first end ( Figure 1 The installation space 16 is formed between the two first side plates 11. The installation space 16 is located on one side of the connecting plate 12 close to the first end of the lifting arm 4 ( Figure 1 on the right side of the image).

[0051] like Figure 4 As shown, the first side panel 11 includes an upper side panel portion 111, a transition inclined panel portion 112, and a lower side panel portion 113, which are arranged in sequence from top to bottom. The upper side panels 111 and the lower side panels 113 are arranged in parallel. The spacing between the transition inclined panel portions 112 of the two first side panels 11 gradually increases from top to bottom. The spacing between the upper side panels 111 of the two first side panels 11 is smaller than the spacing between the lower side panels 113 of the two first side panels 11. The second end of the lower tie rod 3 extends into the installation space 16 and is rotatably connected to the lower side panel portion 113 via the second rotating shaft 35. Specifically, the lower tie rod 3 can fit the two first side panels 11 on both sides in the width direction.

[0052] Because the spacing between the lower side panels 113 of the two first side panels 11 in the connecting base 1 is greater than the spacing between the upper side panels 111 of the two first side panels 11, the bottom of the connecting base 1 is convex relative to the upper structure and has a larger width. Furthermore, the width of the lower tie rod 3 between the lower side panels 113 of the two first side panels 11 is also relatively increased, providing more space for installing the lower tie rod 3. This can increase the width of the lower tie rod 3, thereby improving the overall structural rigidity and strength of the mechanism. This reduces the deformation of the entire mechanism during ramp sideways operation, which is beneficial for extending the service life of the mechanism. Furthermore, the width of the lifting arm 4 can also be increased relative to conventional structures.

[0053] like Figure 1 As shown, the boom 7, luffing cylinder 6, and lifting arm 4 all extend into the installation space 16 and are pivotally connected to the upper side plate 111. Mounting holes 13 are defined in the upper side plate 111 of the first side plate 11, and the synchronization rod 2 extends into the installation space 16. Concentrating the boom 7, luffing cylinder 6, and lifting arm 4 between the upper side plates 111 ensures consistent component and corresponding shaft width requirements, reducing manufacturing complexity.

[0054] like Figure 1As shown, the boom truck's parallel-link luffing mechanism also includes a leveling cylinder 5 extending into the installation space 16. One end of the leveling cylinder 5 is rotationally connected to the boom 7, and the other end is rotationally connected to the sixth hinge point b of the connecting base 1. The sixth hinge point b is located on the upper side plate 111. When the luffing cylinder 6 adjusts the angle of the boom 7, the boom 7 can adaptively drive the leveling cylinder 5 to move telescopically. The leveling cylinder 5 can maintain the current angle of the boom 7. Extending the leveling cylinder 5 into the installation space can increase space utilization and also protect the leveling cylinder 5.

[0055] Furthermore, when the lifting arm 4 and the turntable structure 8 are at a preset installation angle, the sixth hinge point b, the fifth hinge point C, the first hinge point D, and the fourth hinge point E are arranged sequentially in a direction close to the first end of the lifting arm 4. At this point, during installation, the leveling cylinder 5 and the luffing cylinder 6 can be connected to the boom 7 and hoisted above the parallelogram linkage for assembly, with the sixth hinge point b, the fifth hinge point C, the first hinge point D, and the fourth hinge point E staggered horizontally. When the leveling cylinder 5 is connected to the connecting base 1, assembly can be completed by extending and retracting the leveling cylinder 5 and utilizing other weight-reducing holes or process holes in the connecting base 1.

[0056] On the connecting seat 1 , the first side plate 11 is bent in two steps to form an upper side plate portion 111 , a transition inclined plate portion 112 and a lower side plate portion 113 . The first side plate 11 is formed by an integrated plate bending design to ensure structural strength.

[0057] like Figure 1 and Figure 5 As shown, a first reinforcing plate 14 is fixedly provided on the side surface of the upper side plate portion 111 in the width direction and away from the edge of the connecting plate 12 to form a side plate reinforcement area of ​​the upper side plate portion 111. The lifting arm 4, the boom 7, and the boom cylinder 6 are all rotatably connected to the side plate reinforcement area to ensure the structural strength of the hinge concentration area on the connecting seat 1.

[0058] like Figure 1 and Figure 5 As shown, a first rotation limiting groove 15 is opened on the outer surface of the lower side plate portion 113 on a first side plate 11, and a second baffle 351 is fixedly set on one axis end of the second rotating shaft 35 connecting the lower pull rod 3 and the connecting seat 1. The second baffle 351 is clamped in the first rotation limiting groove 15 to prevent the second rotating shaft 35 from rotating relative to the connecting seat 1. At this time, the second rotating shaft 35 can only rotate relative to the lower pull rod 3 but cannot rotate relative to the connecting seat 1, thereby providing structural stability.

[0059] In the lifting arm 4, as Figure 8As shown, the lifting arm 4 includes two second side plates 41 arranged in sequence along the width direction. The second ends of the two second side plates 41 (one end connected to the connecting seat 1) are fixedly provided with a first mounting tube 42 that passes through along the width direction, and the first ends (one end connected to the turntable structure 8) are fixedly provided with a second mounting tube 43 that passes through along the width direction. A first sealing plate 44 is fixedly provided between the two second side plates 41, and the first sealing plate 44 extends from the first mounting tube 42 to the second mounting tube 43. A third rotating shaft is provided in the first mounting tube 42 to rotationally connect the lifting arm 4 and the connecting seat 1, and a fourth rotating shaft is provided in the second mounting tube 43 to rotationally connect the lifting arm 4 and the turntable structure 8, so as to facilitate the connection of the lifting arm with the connecting seat 1 and the turntable structure 8.

[0060] A second reinforcing plate 45 is provided on the outer side surface of the second end of the second side plate 41 in the width direction, and a third reinforcing plate 46 is provided on the outer side surface of the first end of the second side plate 41 in the width direction. The second mounting tube 43 protrudes from the third reinforcing plate 46 along the width direction, and a first reinforcing rib 47 is also fixedly provided between the second mounting tube 43 and the third reinforcing plate 46, which can make full use of the space and ensure the structural strength of the lifting arm 4.

[0061] A second rotation limiting groove 48 is provided on an outer side surface of the lifting arm 4 in the width direction, and a first baffle 491 is fixedly provided at one end of the first rotating shaft 49. The first baffle 491 is clamped in the second rotation limiting groove 48 to prevent the first rotating shaft 49 from rotating relative to the lifting arm 4, thereby improving the structural stability.

[0062] In the synchronization rod 2, as Figure 6 As shown, the synchronous pull rod 2 includes two third side plates 21 arranged in sequence along the width direction. A third mounting tube 22 that passes through the width direction is fixedly provided at the first end of the two third side plates 21, and a fourth mounting tube 23 that passes through the width direction is fixedly provided at the second end. A second sealing plate 24 is fixedly provided between the two third side plates 21, and the second sealing plate 24 extends from the third mounting tube 22 to the fourth mounting tube 23. A fifth rotating shaft is provided in the third mounting tube 22 to rotationally connect the synchronous pull rod 2 and the arm 7. A first rotating shaft 49 is provided in the fourth mounting tube 23 to rotationally connect the synchronous pull rod 2 and the lifting arm 4. A fourth reinforcing plate 25 is provided on the outer surface of the first end of the third side plate 21 in the width direction. The fourth mounting tube 23 protrudes from the third side plate 21 in the width direction. A second reinforcing rib 26 is also fixedly provided between the fourth mounting tube 23 and the third side plate 21.

[0063] In the lower tie rod 3, as Figure 7 As shown, the lower pull rod 3 includes two side rods 32 and a plurality of connecting rods 31 extending along the width direction and connected between the two side rods 32. The two ends of the two side rods 32 are respectively connected to the turntable structure 8 and the connecting seat 1. The first end of the lower pull rod 3 is fixed with the sixth reinforcement plate 34, and the second end is fixed with the fifth reinforcement plate 33 to improve the structural strength.

[0064] The boom truck parallel linkage luffing mechanism in this embodiment operates as follows: the luffing mechanism can be divided into three sets of small mechanisms. The first set is a four-bar mechanism consisting of a connecting base 1, a lower pull rod 3, a lifting arm 4, and a turntable structure 8. This set of mechanisms has fixed hinges H and G, and the connecting base 1, the lower pull rod 3, and the lifting arm 4 move through the hinges H and G. The second set is a four-bar mechanism consisting of a connecting base 1, a synchronous pull rod 2, the lifting arm 4, and the boom 7. The hinges A and D of this set of mechanisms are relatively fixed, and the synchronous pull rod 2, the lifting arm 4, and the boom 7 move through the hinges. The third set of mechanisms is a three-hinged mechanism consisting of a connecting base 1, a luffing cylinder 6, and the boom 7. The connecting base 1 of this set of mechanisms is relatively fixed, and the luffing cylinder 6 is driven to achieve the up and down movement of the boom 7.

[0065] The installation process of the boom truck parallel link variable length mechanism in this embodiment includes the following steps: first, fix the turntable structure 8, and install the connecting seat 1, the lower pull rod 3, and the lifting arm 4 on it. At this time, fix the position of the lower pull rod 3 and the lifting arm 4 by the support fixture 9. Second, assemble the boom 7, the synchronous pull rod 2, and the leveling cylinder 5 in advance, and hoist the whole thing to the top of the lower pull rod 3 and the lifting arm 4 by the crane. By adjusting the position of the synchronous pull rod 2, install the lower hinge point of the synchronous pull rod 2 to the lifting arm 4. Finally, install the variable length cylinder 6 to the connecting seat 1 and the boom 7 through the hinge point.

[0066] Based on the structural setting in this embodiment, assembly can be achieved through the above-mentioned installation process, including the use of tooling positioning, sequential installation sequence, and opening process holes for pin installation during design, etc., which can meet the needs of mass production.

[0067] It should be noted that when an element is referred to as being "fixed" to another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected" to another element, it may be directly connected to the other element or there may be an intermediate element. In addition, in the description of this utility model, unless otherwise specified, "plurality," "plurality," and "plurality of groups" mean two or more.

[0068] Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance or to implicitly specify the quantity of the technical features referred to.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0070] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0071] The above is a detailed introduction to the boom truck parallel linkage luffing mechanism provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core concept of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A boom truck parallel link luffing mechanism, characterized in that: It includes a lifting arm (4), a lower pull rod (3), a connecting seat (1), a turntable structure (8), an arm frame (7), a variable amplitude oil cylinder (6) and a synchronous pull rod (2); The lower pull rod (3) is arranged below the lifting arm (4); the first end of the lifting arm (4) and the first end of the lower pull rod (3) are respectively rotatably connected to the turntable structure (8); the second end of the lifting arm (4) is rotatably connected to the first hinge point (D) of the connecting seat (1); the second end of the lower pull rod (3) is rotatably connected to the second hinge point (F) of the connecting seat (1); the lifting arm (4), the turntable structure (8), the lower pull rod (3) and the connecting seat (1) form a parallelogram linkage mechanism; The turntable structure (8) has a tool cavity (81) for detachably installing a support tool (9), and the support tool (9) can support the lower pull rod (3) at a preset installation angle with the turntable structure (8); One end of the boom (7) is rotatably connected to the third hinge point (A) of the connecting seat (1); one end of the variable amplitude oil cylinder (6) is rotatably connected to the boom (7), and the other end is rotatably connected to the fourth hinge point (E) of the connecting seat (1); one end of the synchronous pull rod (2) is rotatably connected to the boom (7), and the other end is rotatably connected to the fifth hinge point (C) of the lifting arm (4); A mounting hole (13) is provided through the connecting seat (1), and when the lifting arm (4) and the turntable structure (8) are at the preset mounting angle, the fifth hinge point (C) is exposed from the mounting hole (13), and the fifth hinge point (C), the first hinge point (D), and the fourth hinge point (E) are arranged in sequence along the direction close to the first end of the lifting arm (4), and the first rotating shaft (49) can connect the synchronous pull rod (2) and the fifth hinge point (C) through the mounting hole (13).

2. The boom truck parallel link luffing mechanism according to claim 1, characterized in that: The connecting seat (1) includes a connecting plate (12) and two first side plates (11) arranged along the width direction, the connecting plate (12) is fixed to the edge of the two first side plates (11) away from the first end of the lifting arm (4), and an installation space (16) is formed between the two first side plates (11), and the first side plates (11) include an upper side plate portion (111), a transition inclined plate portion (112) and a lower side plate portion (113) arranged in sequence from top to bottom, each of the upper side plate portions (111) and each of the lower side plate portions (113) are arranged in parallel, and the spacing between the transition inclined plate portions (112) of the two first side plates (11) gradually increases from top to bottom, and the spacing between the upper side plate portions (111) of the two first side plates (11) is smaller than the spacing between the lower side plate portions (113) of the two first side plates (11); The second end of the lower pull rod (3) extends into the installation space (16) and is rotatably connected to the lower side plate portion (113) via a second rotating shaft (35).

3. The boom truck parallel link luffing mechanism according to claim 2, characterized in that: The arm (7), the boom cylinder (6), and the lifting arm (4) all extend into the installation space (16) and are rotatably connected to the upper side plate (111); The mounting hole (13) is opened in the upper side plate portion (111) of the first side plate (11), and the synchronous pull rod (2) extends into the mounting space (16).

4. The boom truck parallel link luffing mechanism according to claim 3, characterized in that: It also includes a leveling oil cylinder (5) extending into the installation space (16), one end of the leveling oil cylinder (5) is rotatably connected to the arm (7), and the other end is rotatably connected to the sixth hinge point (b) of the connecting seat (1), and the sixth hinge point (b) is provided on the upper side plate portion (111).

5. The boom truck parallel link luffing mechanism according to claim 4, characterized in that: When the lifting arm (4) and the turntable structure (8) are at the preset installation angle, the sixth hinge point (b), the fifth hinge point (C), the first hinge point (D), and the fourth hinge point (E) are arranged in sequence along a direction close to the first end of the lifting arm (4).

6. The boom truck parallel link luffing mechanism according to claim 2, characterized in that: The first side plate (11) is formed into the upper side plate portion (111), the transition inclined plate portion (112) and the lower side plate portion (113) through two bends.

7. The boom truck parallel link luffing mechanism according to claim 2, characterized in that: A first reinforcing plate (14) is fixedly provided on the side surface of the upper side plate portion (111) in the width direction and away from the edge of the connecting plate (12) to form a side plate reinforcement area of ​​the upper side plate portion (111), and the lifting arm (4), the boom (7), and the boom cylinder (6) are all rotatably connected to the side plate reinforcement area.

8. The boom truck parallel link luffing mechanism according to claim 2, characterized in that: A first rotation-limiting groove (15) is provided on the outer surface of the lower side plate portion (113) on one of the first side plates (11), and a second baffle (351) is fixedly provided on one axial end of the second rotating shaft (35), and the second baffle (351) is engaged with the first rotation-limiting groove (15) to prevent the second rotating shaft (35) from rotating relative to the connecting seat (1).

9. The boom truck parallel link luffing mechanism according to claim 1, characterized in that: The lifting arm (4) includes two second side plates (41) arranged in sequence along the width direction; the second ends of the two second side plates (41) are fixedly provided with a first mounting tube (42) passing through along the width direction, and the first ends are fixedly provided with a second mounting tube (43) passing through along the width direction; a first sealing plate (44) is fixedly provided between the two second side plates (41), the first sealing plate (44) extends from the first mounting tube (42) to the second mounting tube (43), a third rotating shaft is provided in the first mounting tube (42) to rotatably connect the connecting seat (1), and a fourth rotating shaft is provided in the second mounting tube (43) to rotatably connect the turntable structure (8); a second reinforcing plate (45) is provided on the outer side surface in the width direction of the second end of the second side plate (41), a third reinforcing plate (46) is provided on the outer side surface in the width direction of the first end of the second side plate (41), the second mounting tube (43) protrudes from the third reinforcing plate (46) in the width direction, and a first reinforcing rib (47) is fixedly provided between the second mounting tube (43) and the third reinforcing plate (46).

10. The boom truck parallel link luffing mechanism according to claim 9, characterized in that: The lifting arm (4) is provided with a second rotation-limiting groove (48) on an outer side in the width direction, and a first baffle (491) is fixedly provided at one end of the first rotating shaft (49), and the first baffle (491) is engaged with the second rotation-limiting groove (48) to prevent the first rotating shaft (49) from rotating relative to the lifting arm (4).

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