Variable-amplitude oil cylinder with length capable of being finely adjusted and overhead working truck

Abstract

The utility model relates to the technical field of overhead working trucks, and discloses a variable-amplitude oil cylinder with the length capable of being finely adjusted and an overhead working truck, the variable-amplitude oil cylinder with the length capable of being finely adjusted comprises a cylinder body, an oil cylinder piston rod, an oil cylinder head and a locking assembly, the oil cylinder head is movably connected to the free end of the oil cylinder piston rod in the axial direction of the oil cylinder piston rod, the locking assembly is arranged between the oil cylinder piston rod and the oil cylinder head and has a locking state and an unlocking state, when the locking assembly is in the locking state, the oil cylinder head is fixed relative to the oil cylinder piston rod, and when the locking assembly is in the unlocking state, the oil cylinder head is locked. The oil cylinder head can be stressed to move relative to the oil cylinder piston rod. The use flexibility is better, and the operation precision and the safety are higher.

Description

Technical Field

[0001] This utility model relates to the field of aerial work platform technology, and in particular to a variable-length hydraulic cylinder with adjustable length and an aerial work platform. Background Technology

[0002] Aerial work platforms are specialized vehicles used to transport workers and equipment to the site for aerial operations. They are equipped with booms, such as telescopic booms, which are raised and lowered via luffing cylinders. During production, minor manufacturing errors can cause the maximum working length of the luffing cylinders to deviate from the intended length, affecting the boom's operating range. Furthermore, if the boom is driven by two luffing cylinders, discrepancies in their working lengths due to manufacturing errors, assembly errors, or long-term use can lead to boom tilting, compromising the accuracy and completeness of the aerial work platform's operations. Utility Model Content

[0003] Based on the above, the purpose of this utility model is to provide a variable-length hydraulic cylinder and an aerial work platform with adjustable length, which offers better flexibility in use and higher operational accuracy and safety.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A variable-amplitude hydraulic cylinder with adjustable length, comprising a cylinder body, characterized in that it further comprises:

[0006] The piston rod of the hydraulic cylinder is movably sleeved within the cylinder body;

[0007] The cylinder head is movably connected to the free end of the cylinder piston rod along the axial direction of the cylinder piston rod;

[0008] A locking component is disposed between the cylinder piston rod and the cylinder head, and has a locked state and an unlocked state. When the locking component is in the locked state, the position of the cylinder head relative to the cylinder piston rod is fixed. When the locking component is in the unlocked state, the cylinder head can be moved relative to the cylinder piston rod under force.

[0009] As a preferred embodiment of a variable-amplitude cylinder with adjustable length, the cylinder head and the cylinder piston rod are threaded together.

[0010] As a preferred embodiment of a variable-amplitude cylinder with adjustable length, the portion of the cylinder piston rod near its free end forms a first threaded section, the cylinder head includes a hinge ring and a connecting handle, the free end of the connecting handle has an internal threaded hole, and the first threaded section is threadedly engaged with the internal threaded hole.

[0011] As a preferred embodiment of a variable amplitude cylinder with adjustable length, the locking assembly includes a locking stop pin, and the connecting handle has a locking hole communicating with the internal thread hole. The locking stop pin is axially inserted through the locking hole and can abut against or move away from the outer periphery of the cylinder piston rod.

[0012] As a preferred embodiment of a variable-amplitude cylinder with adjustable length, the outer periphery of the locking stop has a locking external thread, and the locking hole has a locking internal thread, with the locking external thread and the locking internal thread being threadedly connected.

[0013] As a preferred embodiment of a variable-amplitude cylinder with adjustable length, the locking assembly further includes a locking nut, the locking thread being threaded onto the locking stop and abutting against the outer wall of the connecting handle.

[0014] As a preferred embodiment of a variable-amplitude cylinder with adjustable length, the locking assembly further includes a locking ring. The portion of the cylinder piston rod adjacent to the first threaded segment forms a second threaded segment. The thread direction of the second threaded segment is opposite to that of the first threaded segment. The locking ring is threaded onto the second threaded segment and can abut against or move away from the free end of the connecting handle.

[0015] As a preferred embodiment of a variable-amplitude cylinder with adjustable length, the locking ring has a wrench slot on its outer periphery.

[0016] An aerial work platform includes a vehicle body, a boom, and a luffing cylinder with adjustable length as described in any of the above technical solutions. The boom is hinged to the vehicle body, and one end of the luffing cylinder with adjustable length is hinged to the vehicle body, while the other end is hinged to the boom.

[0017] The beneficial effects of this utility model are as follows:

[0018] This utility model provides a variable-length hydraulic cylinder with adjustable length. By adjusting the position of the cylinder head on the piston rod axis, the working length of the variable-length hydraulic cylinder can be finely adjusted within a certain range. This can compensate for production errors or adjust the synchronization of two independent variable-length hydraulic cylinders, and can also increase the maximum working amplitude of the variable-length hydraulic cylinder to a certain extent, thereby improving its applicability and practicality. Furthermore, the locking component can lock the cylinder head to ensure stable and reliable operation after adjustment, and it is also easy to unlock and adjust the cylinder head as needed at any time, providing excellent adjustability.

[0019] This utility model also provides an aerial work platform vehicle, which can finely adjust the working range or tilt of the working arm by adjusting the position of the hydraulic cylinder head, so as to ensure the working stability, accuracy and safety of the aerial work platform vehicle. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0021] Figure 1 This is a partial structural schematic diagram of the variable amplitude cylinder with adjustable length provided in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the cylinder head provided in an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of the cylinder head provided in an embodiment of the present invention;

[0024] Figure 4 This is a partial structural schematic diagram of the cylinder piston rod provided in an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the locking ring provided in an embodiment of the present invention.

[0026] In the picture:

[0027] 1. Cylinder piston rod; 11. First threaded section; 12. Second threaded section; 2. Cylinder head; 21. Hinge joint; 22. Connecting handle; 220. Internal threaded hole; 2200. Locking hole; 3. Locking assembly; 31. Locking stop; 32. Locking ring; 320. Wrench slot. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element 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 this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0032] Aerial work platforms are specialized vehicles used to transport workers and equipment to the site for aerial operations. They are equipped with booms, such as telescopic booms, which are raised and lowered via luffing cylinders. During production, minor manufacturing errors can cause the maximum working length of the luffing cylinders to deviate from the intended length, affecting the boom's operating range. Furthermore, if the boom is driven by two luffing cylinders, manufacturing errors or assembly deviations over time can cause inconsistencies in the working lengths of the two cylinders, leading to boom tilting and affecting the accuracy and completeness of the aerial work platform's operations.

[0033] Based on the above-mentioned technical problems, this embodiment provides a variable-amplitude cylinder with adjustable length, such as... Figures 1 to 5As shown, the adjustable-length luffing cylinder includes a cylinder body, a cylinder piston rod 1, a cylinder head 2, and a locking assembly 3. The cylinder piston rod 1 is movably sleeved in the cylinder body, and a piston is also movably installed inside the cylinder body. Hydraulic oil is input into the cylinder body from the outside to push the piston to move, thereby pushing the cylinder piston rod 1 to move axially along the cylinder body. One end of the cylinder piston rod 1 is connected to the piston, and the other end is a free end that extends from one end of the cylinder body. The cylinder head 2 is movably connected to the free end of the cylinder piston rod 1 along the axial direction of the cylinder piston rod 1. The cylinder head 2 is used to hinge with the boom on the aerial work platform. The locking assembly 3 is located between the cylinder piston rod 1 and the cylinder head 2 and has a locked state and an unlocked state. When the locking assembly 3 is in the locked state, the position of the cylinder head 2 relative to the cylinder piston rod 1 is fixed. When the locking assembly 3 is in the unlocked state, the cylinder head 2 can be moved relative to the cylinder piston rod 1 under force. By adjusting the position of the cylinder head 2 axially on the piston rod 1, the working length of the luffing cylinder can be finely adjusted within a certain range. This can compensate for production errors or adjust the synchronization of two independent luffing cylinders. It can also increase the maximum working amplitude of the luffing cylinder to a certain extent, thereby improving its applicability and practicality. Furthermore, the locking component 3 can lock the cylinder head 2, ensuring stable and reliable operation after adjustment. It also allows for easy unlocking and adjustment of the cylinder head 2 as needed, providing excellent adjustability.

[0034] The cylinder head 2 and the cylinder piston rod 1 are threaded together. The position of the cylinder head 2 relative to the cylinder piston rod 1 can be adjusted by turning the cylinder head 2. The operation is simple and the connection strength is good.

[0035] In this embodiment, as Figures 2 to 4 As shown, the cylinder head 2 includes a hinge ring and a connecting handle 22. The portion of the cylinder piston rod 1 near its free end forms a first threaded section 11. The free end of the connecting handle 22 has an internal threaded hole 220, and the first threaded section 11 is threadedly engaged with the internal threaded hole 220. The hinge ring connects to the boom on the aerial work platform, enabling the luffing cylinder to drive the boom and achieve its pitching motion. By tightening the connecting handle 22, the length of the connection between the first threaded section 11 and the internal threaded hole 220 can be shortened or lengthened, meaning the cylinder head 2 moves away from or closer to the cylinder piston rod 1 along its axial direction, thus changing the overall length of the luffing cylinder to adapt to different operational needs. Furthermore, the threaded engagement of the first threaded section 11 and the internal threaded hole 220 not only simplifies operation and facilitates production but also provides a stable and strong connection. Of course, in other embodiments, the connecting handle 22 can also be movably connected to the cylinder piston rod 1 in other ways, such as by insertion.

[0036] After adjusting the position of the cylinder head 2, in order to ensure the positional stability of the cylinder head 2, the cylinder head 2 is locked by the locking component 3. Specifically, as follows: Figure 1As shown, the locking assembly 3 includes a locking stop 31. The connecting handle 22 has a locking hole 2200 communicating with the internal threaded hole 220. The locking stop 31 is axially inserted through the locking hole 2200 and can abut against or move away from the outer periphery of the cylinder piston rod 1. When the cylinder head 2 needs adjustment, the position of the locking stop 31 in the locking hole 2200 is adjusted so that the locking stop 31 moves away from the cylinder piston rod 1, meaning it does not interfere with or restrict the cylinder piston rod 1, facilitating the application of force to adjust the cylinder head 2, such as by rotating the cylinder head 2. After adjustment, the position of the locking stop 31 in the locking hole 2200 is adjusted so that the locking stop 31 abuts against the outer periphery of the cylinder piston rod 1. In other words, the locking stop 31 restricts the relative movement of the cylinder piston rod 1 and the cylinder head 2, ensuring the relative positional stability of the cylinder head 2 and the cylinder piston rod 1.

[0037] More specifically, the outer periphery of the locking stop 31 is formed with a locking external thread, and the locking hole 2200 is formed with a locking internal thread. The locking external thread and the locking internal thread are threadedly connected. Through the threaded engagement of the locking external thread and the locking internal thread, the locking stop 31 can be adjusted to abut against or move away from the piston rod 1 of the hydraulic cylinder simply by turning the locking stop 31. It is easy to operate, has high structural strength, and is not easy to loosen after being adjusted.

[0038] In this embodiment, the piston rod 1 of the hydraulic cylinder has a limiting abutment section adjacent to the first threaded section 11. The limiting abutment section is not provided with external threads. One end of the locking stop 31 abuts against or moves away from the limiting abutment section to ensure the limiting effect.

[0039] Preferably, the locking stop 31 abuts against the rear portion of the cylinder piston rod 1, which protrudes from the outer wall of the connecting handle 22. The locking assembly 3 also includes a locking nut, which is threaded onto the locking stop 31 and abuts against the outer wall of the connecting handle 22. By screwing the locking nut into the locking stop 31 and abutting against the outer wall of the connecting handle 22, the locking stop 31 can be locked, effectively preventing the locking stop from retracting away from the cylinder piston rod 1.

[0040] It should be noted that the locking stop 31 and the locking nut can be, but are not limited to, one. For example, there can be two locking stops and two corresponding locking nuts. The two locking stops 31 are movably arranged on the connecting handle 22 to abut against the piston rod 1 of the hydraulic cylinder, thereby further improving the locking effectiveness.

[0041] Furthermore, such as Figure 1 and Figure 5As shown, the locking assembly 3 also includes a locking ring 32. The portion of the cylinder piston rod 1 near the first threaded section 11 forms a second threaded section 12. The thread direction of the second threaded section 12 is opposite to that of the first threaded section 11. The locking ring 32 is threaded onto the second threaded section 12 and can abut against or move away from the free end of the connecting handle 22. The free end of the connecting handle 22 refers to the end away from the hinge joint 21. When the cylinder head 2 needs to be adjusted, the locking ring 32 is turned to move away from the connecting handle 22, avoiding restriction on the connecting handle 22. After the cylinder head 2 is adjusted to the correct position, the locking ring 32 is turned in the opposite direction until it abuts against the free end of the connecting handle 22. At this time, the locking ring 32 provides a limiting function for the cylinder head 2, effectively preventing the cylinder head 2 from moving towards the cylinder piston rod 1 under force, ensuring the positional stability of the cylinder head 2, and thus ensuring the operational stability of the luffing cylinder.

[0042] Preferably, a wrench slot 320 is provided on the outer periphery of the locking ring 32 to facilitate the matching of the wrench with the locking ring 32, thereby turning the locking ring 32.

[0043] This embodiment also provides an aerial work platform, which includes a vehicle body, a working arm, and the aforementioned adjustable-length luffing cylinder. The working arm is hinged to the vehicle body, and one end of the adjustable-length luffing cylinder is hinged to the vehicle body, while the other end is hinged to the working arm. When the piston rod 1 of the luffing cylinder extends outward relative to the cylinder body, the working arm is raised, causing it to tilt upward relative to the vehicle body. When the piston rod 1 retracts into the cylinder body, the working arm tilts downward. By employing the aforementioned adjustable-length luffing cylinder, even for luffing cylinders with production or assembly errors, the maximum working length of the luffing cylinder can be adjusted according to the actual working conditions by adjusting the axial position of the cylinder head 2. This ensures that the working arm can reach the preset pitch range and also allows for adjustment of the maximum pitch angle of the working arm according to actual needs, providing excellent flexibility in use.

[0044] To ensure the stability of the boom, two luffing cylinders are installed. The boom's pitch is achieved by the simultaneous operation of the two cylinders. The synchronization of the two cylinders can be ensured by adjusting the cylinder head 2, avoiding errors in the maximum length of the two cylinders due to production errors, assembly errors, or errors caused by long-term use. This ensures the operational reliability and stability of the boom. After prolonged use, the boom may tilt to one side. By adjusting the axial position of the cylinder head 2 of the luffing cylinder, the position of the boom can be corrected, thereby extending the service life of the boom.

[0045] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A length-tunable variable amplitude cylinder comprising a cylinder body, characterized by, Also included are: a cylinder piston rod movably sleeved in the cylinder body; a cylinder head movably connected to a free end of the cylinder piston rod along an axial direction of the cylinder piston rod; a locking assembly arranged between the cylinder piston rod and the cylinder head, having a locked state and an unlocked state, when the locking assembly is in the locked state, the cylinder head is fixed relative to the cylinder piston rod, when the locking assembly is in the unlocked state, the cylinder head can be moved relative to the cylinder piston rod under force.

2. The length-tunable variable amplitude cylinder of claim 1, wherein, The cylinder head and the cylinder piston rod are threadedly connected.

3. The length-tolerable variable amplitude cylinder according to claim 2, characterized in that, A portion of the cylinder piston rod close to the free end forms a first threaded section, the cylinder head includes a hinged ring and a connecting handle, a free end of the connecting handle is formed with an internally threaded hole, and the first threaded section is threadedly connected with the internally threaded hole.

4. The length-tolerable variable amplitude cylinder according to claim 3, characterized in that, The locking assembly includes a locking stop column, the connecting handle is provided with a locking hole communicated with the internally threaded hole, the locking stop column is movably arranged in the locking hole along an axial direction of the locking hole and can abut against or be away from an outer periphery of the cylinder piston rod.

5. The length-tolerable variable amplitude cylinder according to claim 4, characterized in that, An outer periphery of the locking stop column is formed with a locking external thread, an inner periphery of the locking hole is formed with a locking internal thread, and the locking external thread is threadedly connected with the locking internal thread.

6. The length-tolerable variable amplitude cylinder according to claim 5, characterized in that The locking assembly further includes a locking nut, the locking nut is threadedly connected on the locking stop column and can abut against an outer wall of the connecting handle.

7. The length-tolerant variable amplitude cylinder of claim 3 wherein, The locking assembly further includes a locking ring, a portion of the cylinder piston rod close to the first threaded section forms a second threaded section, a thread direction of the second threaded section is opposite to that of the first threaded section, the locking ring is threadedly sleeved on the second threaded section and can abut against or be away from the free end of the connecting handle.

8. The length-tunable variable amplitude cylinder of claim 7, wherein, An outer periphery of the locking ring is provided with a wrench clamping groove.

9. An aerial work platform, characterized in that A vehicle body, a working arm and a length-adjustable luffing cylinder as claimed in any one of claims 1-8, the working arm is hinged on the vehicle body, one end of the length-adjustable luffing cylinder is hinged on the vehicle body and the other end is hinged on the working arm.

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