Quick-change connecting device for telescopic boom forklift

Abstract

The invention discloses a telescopic boom forklift quick-change connecting device which comprises a quick-change vertical plate, a rocker arm, a connecting rod arm, an anti-rotation assembly, a leveling oil cylinder, a first rotating shaft, a second rotating shaft and a third rotating shaft. One end of the rocker arm is hinged to a telescopic boom frame through the first rotating shaft, and the other end of the rocker arm is hinged to one end of the connecting rod arm through the second rotating shaft; the other end of the connecting rod arm is hinged to the quick-change vertical plate through a third rotating shaft to form a triple-rod transmission structure, the anti-rotation assembly is arranged in the middle of the rocker arm in a limited mode, the output end of the leveling oil cylinder is connected with the anti-rotation assembly, and the rocker arm is driven to rotate around the first rotating shaft through stretching and retracting of the leveling oil cylinder. And then the connecting rod arm and the quick-change vertical plate are driven to rotate around the third rotating shaft, and the dip angle of the accessory on the quick-change vertical plate is adjusted. According to the invention, the rotation angles of forward inclination and backward inclination of the whole quick-change structure are greatly increased, the working rotation range of an accessory mounted on the quick-change structure is greatly increased, the working condition of the whole vehicle is greatly improved, and the performance of the whole vehicle is improved.

Description

Technical Field

[0001] This invention belongs to the field of forklift technology, and particularly relates to a quick-change connection device for telescopic boom forklifts. Background Technology

[0002] like Figure 1 As shown, the existing attachment connection structure of telescopic forklifts adopts a single shaft connection design. The quick-change component is directly fixed to the telescopic boom via a fixed shaft 100, connected to the leveling cylinder via a cylinder connecting shaft 200, and connected to the attachment via an attachment connecting shaft 300. The rotation angle of the attachment is controlled solely by the unidirectional extension and retraction of the leveling cylinder. This structure has many drawbacks: First, the single connection method results in a narrow range of forward and backward rotation angles for the attachment. The cylinder can only extend and retract in one direction, which cannot meet the diverse tilt angle requirements of complex operating scenarios, resulting in a serious lack of overall machine operational flexibility. Second, the simple structural design lacks dedicated limit and anti-rotation components, making it prone to axial rotation and radial movement during operation, resulting in poor stability and potential safety hazards. Third, the quick-change component uses a welded shaft type, which can only adapt to a single type of attachment, resulting in extremely low versatility and limiting the expansion of the forklift's operational functions, failing to meet the diverse application needs of the market. Fourth, the articulated parts lack an effective lubrication structure and wear-resistant design, leading to severe wear, short service life, and high maintenance costs. Therefore, there is an urgent need for a quick-change connection device that can expand the tilt adjustment range, improve attachment adaptability, enhance structural stability, and reduce wear. Summary of the Invention

[0003] To at least partially solve the technical problems existing in the prior art, the present invention provides a quick-change connection device for telescopic boom forklifts.

[0004] The present invention relates to a quick-change connection device for telescopic boom forklifts, which is installed on the telescopic boom arm. The quick-change connection device includes a quick-change upright plate, a rocker arm, a connecting arm, an anti-rotation component, a leveling cylinder, a first rotating shaft, a second rotating shaft, and a third rotating shaft. One end of the rocker arm is hinged to the telescopic boom arm via the first rotating shaft, and the other end of the rocker arm is hinged to one end of the connecting arm via the second rotating shaft. The other end of the connecting arm is hinged to the quick-change upright plate via the third rotating shaft, forming a three-bar linkage structure. The anti-rotation component is positioned at the middle of the rocker arm. The leveling cylinder is installed on the telescopic boom arm, and its output end is connected to the anti-rotation component. The extension and retraction of the leveling cylinder drives the rocker arm to rotate around the first rotating shaft, thereby causing the connecting arm and the quick-change upright plate to rotate around the third rotating shaft, adjusting the tilt angle of the attachments on the quick-change upright plate. The anti-rotation assembly includes a connecting shaft, a connecting plate, a limiting platform, and a retaining ring. The connecting plate is welded to one end of the connecting shaft, the limiting platform is welded to the side of the connecting plate near the connecting shaft, and is used to limit the axial movement of the connecting shaft. The retaining ring is disposed at the end of the connecting shaft and is used to limit the radial movement of the connecting shaft.

[0005] Furthermore, in the above-mentioned telescopic forklift quick-change connection device, the rocker arm is arranged in a C-shaped box structure, and a first connecting shaft hole and a second connecting shaft hole are opened at both ends of the rocker arm. Both the first connecting shaft hole and the second connecting shaft hole are fitted with copper sleeve oil passages, and oil cups communicating with the copper sleeve oil passages are installed on the copper sleeve oil passages.

[0006] Furthermore, in the above-mentioned telescopic forklift quick-change connection device, the first rotating shaft passes through the first connecting shaft hole and is hinged to the connecting arm, and the second rotating shaft passes through the second connecting shaft hole and is hinged to the connecting arm.

[0007] Furthermore, in the above-mentioned telescopic forklift quick-change connection device, a mounting hole is provided in the middle of the rocker arm, and a limiting hole is provided on the side of the rocker arm near the mounting hole. The mounting hole matches the connecting shaft, and the connecting shaft passes through the mounting hole and is radially limited by the snap ring. The limiting hole matches the limiting platform, and the limiting platform is engaged in the limiting hole to axially limit the connecting shaft.

[0008] Furthermore, in the aforementioned telescopic boom forklift quick-change connection device, the connecting arm is an integrally formed rigid structure, with hinge holes at both ends adapted to the second and third rotating shafts, respectively.

[0009] Furthermore, in the aforementioned telescopic forklift quick-change connection device, the first rotating shaft, the second rotating shaft, and the third rotating shaft are all equipped with wear-resistant bushings. The wear-resistant bushings are interference-fitted with the corresponding hinge components to reduce motion wear.

[0010] Furthermore, in the above-mentioned telescopic boom forklift quick-change connection device, the quick-change upright plate is a box structure, and the quick-change upright plate is provided with multiple connection holes adapted to attachments of different specifications. The diameter and distribution of the connection holes correspond to the connection structure of commonly used work attachments, so as to realize quick-change adaptation of multiple attachments.

[0011] The telescopic boom forklift quick-change connection device of the present invention has the following advantages and beneficial effects: This invention significantly improves the overall quick-change tilt and tilt rotation angles, greatly increases the working rotation range of attachments mounted on the quick-change structure, and significantly improves the overall working conditions and performance of the vehicle. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A schematic diagram of the structure of a quick-change connection device for a telescopic forklift in the prior art; Figure 2 This is a schematic diagram of the structure of the telescopic boom forklift quick-change connection device of the present invention; Figure 3 This is a schematic diagram of the rocker arm structure of the telescopic boom forklift quick-change connection device of the present invention; Figure 4 This is a schematic diagram of the anti-rotation component structure of the telescopic boom forklift quick-change connection device of the present invention; Figure 5 This is a schematic diagram of the telescopic boom forklift quick-change connection device of the present invention installed on the telescopic boom.

[0013] Explanation of reference numerals in the attached figures: 100: Fixed shaft; 200: Hydraulic cylinder connecting shaft; 300: Attachment connecting shaft; 10: Telescopic boom; 1: Quick-change upright plate; 11: Connection hole; 2: Rocker arm; 21: First connecting shaft hole; 22: Second connecting shaft hole; 23: Copper sleeve oil passage; 24: Oil cup; 25: Mounting hole; 26: Limiting hole; 3: Linkage arm; 31: Hinge hole; 4: Anti-rotation component; 41: Connecting shaft; 42: Connecting plate; 43: Limiting platform; 44: Snap ring; 5: Leveling cylinder; 6: First rotating shaft; 7: Second rotating shaft; 8: Third rotating shaft. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0015] like Figures 2 to 5As shown, the quick-change connection device for telescopic boom forklifts of the present invention is installed on the telescopic boom 10. The quick-change connection device includes a quick-change upright plate 1, a rocker arm 2, a connecting arm 3, an anti-rotation component 4, a leveling cylinder 5, a first rotating shaft 6, a second rotating shaft 7, and a third rotating shaft 8. One end of the rocker arm 2 is hinged to the telescopic boom 10 via the first rotating shaft 6, and the other end of the rocker arm 2 is hinged to one end of the connecting arm 3 via the second rotating shaft 7. The other end of the connecting arm 3 is hinged to the quick-change upright plate 1 via the third rotating shaft 8, forming a three-bar linkage structure. The anti-rotation component 4 is positioned in the middle of the rocker arm 2. The leveling cylinder 5 is installed on the telescopic boom 10, and the output end of the leveling cylinder 5 is connected to the anti-rotation component 4. The extension and retraction of the leveling cylinder 5 drives the rocker arm 2 to rotate around the first rotating shaft 6, thereby driving the connecting arm 3 and the quick-change upright plate 1 to rotate around the third rotating shaft 8, thereby adjusting the tilt angle of the attachments on the quick-change upright plate 1.

[0016] The anti-rotation assembly 4 includes a connecting shaft 41, a connecting plate 42, a limiting platform 43, and a retaining ring 44. The connecting plate 42 is welded to one end of the connecting shaft 41, the limiting platform 43 is welded to the side of the connecting plate 42 near the connecting shaft 41, and is used to limit the axial movement of the connecting shaft 41. The retaining ring 44 is located at the end of the connecting shaft 41 and is used to limit the radial movement of the connecting shaft 41.

[0017] Furthermore, in the aforementioned telescopic forklift quick-change connection device, the rocker arm 2 is arranged in a C-shaped box structure. The C-shaped box design not only ensures structural rigidity and resistance to deformation, but also optimizes the component assembly space, making the overall structure more compact. The rocker arm 2 has a first connecting shaft hole 21 and a second connecting shaft hole 22 at both ends. Both the first connecting shaft hole 21 and the second connecting shaft hole 22 are fitted with copper sleeve oil passages 23. The copper sleeve oil passages 23 are equipped with oil cups 24 that communicate with the copper sleeve oil passages 23, which can periodically add lubricating oil into the oil passages to form a self-lubricating system and reduce the wear of the rotating shaft and shaft hole.

[0018] Furthermore, in the aforementioned telescopic forklift quick-change connection device, the first rotating shaft 6 passes through the first connecting shaft hole 21 and is hinged to the connecting arm 3, and the second rotating shaft 7 passes through the second connecting shaft hole 22 and is hinged to the connecting arm 3.

[0019] Furthermore, in the aforementioned telescopic forklift quick-change connection device, a mounting hole 25 is provided in the middle of the rocker arm 2, and a limiting hole 26 is provided on the side of the rocker arm 2 near the mounting hole 25. The mounting hole 25 is matched with the connecting shaft 41, and the connecting shaft 41 passes through the mounting hole 25 and is radially limited by the snap ring 44. The limiting hole 26 is matched with the limiting platform 43, and the limiting platform 43 is engaged in the limiting hole 26 to axially limit the connecting shaft 41, thereby effectively preventing the connecting shaft 41 from both axial rotation and radial transmission displacement, ensuring that the device operates stably without displacement deviation during high-intensity operations.

[0020] Furthermore, in the aforementioned telescopic boom forklift quick-change connection device, the connecting arm 3 is a rigid structure integrally formed using high-strength alloy material, possessing excellent rigidity and fatigue resistance, and capable of withstanding repeated impacts during operation. Its two ends are respectively provided with hinge holes 31 adapted to the second rotating shaft 7 and the third rotating shaft 8, respectively, which are interference-fitted with the second rotating shaft 7 and the third rotating shaft 8. An annular lubrication groove can be provided on the inner wall of the hinge hole 31 to store lubricating oil, further reducing frictional loss at the hinge and ensuring transmission flexibility and component lifespan.

[0021] Furthermore, in the aforementioned quick-change connection device for telescopic boom forklifts, the first rotating shaft 6, the second rotating shaft 7, and the third rotating shaft 8 are all equipped with wear-resistant bushings. The wear-resistant bushings are interference-fitted with the corresponding hinge components, such as interference-fitted with the shaft hole of the telescopic boom 10 and the hinge hole 31 of the connecting rod arm 3. This can effectively reduce the direct wear between the rotating shaft and the hinge components, extend the service life of the components, and reduce the frequency of maintenance.

[0022] Furthermore, in the above-mentioned telescopic boom forklift quick-change connection device, the quick-change upright plate 1 is a box structure, and multiple connection holes 11 adapted to different specifications of attachments are provided on the quick-change upright plate 1. The hole diameter and distribution of the connection holes 11 correspond to the connection structure of commonly used working attachments, so as to realize quick-change adaptation of multiple attachments.

[0023] Specifically, this device adopts a three-bar linkage design of "rocker arm 2 - connecting arm 3 - quick-change platform 1". The three are connected in sequence by the first rotating shaft 6, the second rotating shaft 7, and the third rotating shaft 8 to form a stable transmission mechanism. The first rotating shaft 6 is the hinge center between the rocker arm 2 and the telescopic boom 10, the second rotating shaft 7 is the power transmission node between the rocker arm 2 and the connecting arm 3, and the third rotating shaft 8 is the rotation center between the connecting arm 3 and the quick-change platform 1. This structure can significantly improve the rotation angle range of the quick-change platform 1 through the lever amplification effect. During operation, the hydraulic system controls the bidirectional extension and retraction of the leveling cylinder 5, which pushes the rocker arm 2 to reciprocate around the first rotating shaft 6. The rocker arm 2 drives the connecting arm 3 to perform planar motion through the second rotating shaft 7. The connecting arm 3 then transmits power through the third rotating shaft 8 to drive the quick-change platform 1 to rotate around its own rotation center. Finally, the forward and backward tilt angles of the attachments on the quick-change platform 1 can be adjusted to meet the tilt angle requirements of different working scenarios.

[0024] In summary, compared with the prior art, the telescopic boom forklift quick-change connection device of the present invention has the following advantages and beneficial effects: the present invention greatly improves the overall quick-change forward and backward tilt rotation angles, greatly improves the working rotation range of the attachments installed on the quick-change structure, greatly improves the working conditions of the whole vehicle, and improves the overall vehicle performance.

[0025] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quick-change connection device for a telescopic boom forklift, installed on the telescopic boom arm, characterized in that, The telescopic boom forklift quick-change connection device includes a quick-change upright plate, a rocker arm, a connecting arm, an anti-rotation component, a leveling cylinder, a first rotating shaft, a second rotating shaft, and a third rotating shaft. One end of the rocker arm is hinged to the telescopic boom frame via the first rotating shaft, and the other end of the rocker arm is hinged to one end of the connecting arm via the second rotating shaft. The other end of the connecting arm is hinged to the quick-change upright plate via the third rotating shaft, forming a three-bar linkage structure. The anti-rotation component is positioned in the middle of the rocker arm. The leveling cylinder is mounted on the telescopic boom frame, and its output end is connected to the anti-rotation component. The extension and retraction of the leveling cylinder drives the rocker arm to rotate around the first rotating shaft, thereby causing the connecting arm and the quick-change upright plate to rotate around the third rotating shaft, adjusting the tilt angle of the attachments on the quick-change upright plate. The anti-rotation assembly includes a connecting shaft, a connecting plate, a limiting platform, and a retaining ring. The connecting plate is welded to one end of the connecting shaft, the limiting platform is welded to the side of the connecting plate near the connecting shaft, and is used to limit the axial movement of the connecting shaft. The retaining ring is disposed at the end of the connecting shaft and is used to limit the radial movement of the connecting shaft.

2. The quick-change connection device for telescopic boom forklifts according to claim 1, characterized in that, The rocker arm is configured in the shape of a C-shaped box. The rocker arm has a first connecting shaft hole and a second connecting shaft hole at both ends. Both the first connecting shaft hole and the second connecting shaft hole are fitted with copper sleeve oil passages. An oil cup communicating with the copper sleeve oil passage is installed on the copper sleeve oil passage.

3. The quick-change connection device for telescopic boom forklifts according to claim 2, characterized in that, The first rotating shaft passes through the first connecting shaft hole and is hinged to the connecting rod arm, and the second rotating shaft passes through the second connecting shaft hole and is hinged to the connecting rod arm.

4. The quick-change connection device for telescopic boom forklifts according to claim 1, characterized in that, The rocker arm has a mounting hole in the middle and a limiting hole on the side of the rocker arm near the mounting hole. The mounting hole matches the connecting shaft. The connecting shaft passes through the mounting hole and is radially limited by the snap ring. The limiting hole matches the limiting platform. The limiting platform is engaged in the limiting hole to axially limit the connecting shaft.

5. The quick-change connection device for telescopic boom forklifts according to claim 1, characterized in that, The connecting arm is a rigid structure formed in one piece, and its two ends are respectively provided with hinge holes adapted to the second rotating shaft and the third rotating shaft.

6. The quick-change connection device for telescopic boom forklifts according to claim 1, characterized in that, The first, second, and third rotating shafts are all equipped with wear-resistant bushings, which are interference-fitted with the corresponding hinge components to reduce motion wear.

7. The quick-change connection device for telescopic boom forklifts according to claim 1, characterized in that, The quick-change plate is a box structure, and multiple connection holes are provided on the quick-change plate to adapt to attachments of different specifications. The diameter and distribution of the connection holes correspond to the connection structure of commonly used work attachments, so as to realize quick-change adaptation of multiple attachments.

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