A telescopic arm stroke amplification mechanism

Abstract

The utility model relates to the technical field of cranes, and provides a telescopic arm stroke magnification mechanism, which includes a sleeved outer arm and an inner arm, and is also provided with an extended hydraulic cylinder assembly, a hydraulic cylinder stroke magnification assembly, an upper chain and a lower chain connected around a front sprocket and a rear sprocket, an upper chain locking mechanism is provided at the front end of the upper chain, and the upper chain locking mechanism is fixedly connected to a base; a lower chain synchronous tensioning mechanism is provided at the rear end of the lower chain, and the lower chain synchronous tensioning mechanism is fixedly connected to the inner arm. The utility model designs the front sprocket and the rear sprocket as well as the upper and lower chains. When the telescopic rod stroke of the hydraulic cylinder is L, that is, the stroke of the front sprocket and the rear sprocket is L, the stroke of the inner arm relative to the rear sprocket is also L, that is, the stroke of the inner arm is 2L, and the stroke of the inner arm is magnified. A long telescopic effect can be achieved by using a shorter hydraulic cylinder stroke, thereby improving the stroke limitation of the traditional hydraulic cylinder, increasing the operating range of the boom, and reducing energy consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to a telescopic arm stroke amplification mechanism. Background Art

[0002] Cranes are widely used in construction, transportation, logistics loading and unloading, port operations, installation and handling of large equipment, etc. Cranes are usually equipped with retractable booms to provide the necessary flexibility and extension capabilities to adapt to different lifting heights and span requirements. The application of telescopic booms can increase the operating radius of the crane, adapt to the operation requirements of different heights, quickly switch the operation mode, and switch from long-distance heavy-load operations to close-range fine operations, facilitating the transportation of cranes and their movement in cities or narrow areas.

[0003] Most of the telescopic arms of existing cranes are driven by hydraulic cylinders. The telescopic length of the hydraulic cylinder is equal to the telescopic length of the boom. The telescopic length of the hydraulic cylinder directly limits the telescopic range of the boom, resulting in the boom being unable to achieve a longer telescopic distance. In some cases, the telescopic action of the hydraulic cylinder needs to be completed multiple times to achieve full extension or retraction of the boom, which reduces the operating efficiency. In addition, if the hydraulic cylinder needs to be frequently extended and retracted to achieve the full stroke of the boom, it will lead to increased energy consumption. Utility Model Content

[0004] In order to solve the problems existing in the background technology, the utility model provides a telescopic arm stroke amplification mechanism, which includes a sleeved outer arm and an inner arm, and is also provided with an extended hydraulic cylinder assembly, the extended hydraulic cylinder assembly includes a base, a hydraulic cylinder and an outer arm fixing pin; the hydraulic cylinder includes a fixing rod and a telescopic rod, the fixing rod is connected and fixed to the base; the outer arm is fixedly connected to the base through the outer arm fixing pin; a hydraulic cylinder stroke amplification assembly, the hydraulic cylinder stroke amplification assembly includes a front sprocket and a rear sprocket, the front sprocket is fixedly connected to the telescopic rod; an upper chain and a lower chain are connected around the front sprocket and the rear sprocket, an upper chain locking mechanism is provided at the front end of the upper chain, and the upper chain locking mechanism is fixedly connected to the base; a lower chain synchronous tensioning mechanism is provided at the rear end of the lower chain, and the lower chain synchronous tensioning mechanism is fixedly connected to the inner arm.

[0005] In the preferred solution, there are two front sprockets, a front sprocket shaft is arranged between the two front sprockets, and the telescopic rod is connected to the front sprocket shaft; there are two rear sprockets, a rear sprocket shaft is arranged between the two rear sprockets; and two upper chains and two lower chains are arranged accordingly.

[0006] In a preferred solution, an upper chain connecting plate is provided between the upper chain locking mechanism and the base, and the upper chain locking mechanism is fixedly connected to the base via the upper chain connecting plate.

[0007] In a preferred embodiment, a V-shaped rear sprocket connecting plate is installed between the two rear sprockets.

[0008] In a preferred solution, the upper chain locking mechanism includes locking blocks respectively fixedly connected to the two upper chains.

[0009] In a preferred solution, a locking pin is provided between the two locking blocks, and the upper chain connecting plate is fixedly connected to the locking pin.

[0010] In a preferred solution, a support beam is provided between the front sprocket and the rear sprocket.

[0011] In a preferred solution, the lower chain synchronous tensioning mechanism includes a locking seat fixedly mounted on the lower chain, an inner arm fixing pin is provided on the locking seat, and the inner arm is fixedly connected to the locking seat via the inner arm fixing pin.

[0012] In a preferred solution, two locking seats are provided, which are respectively fixedly mounted on the two free ends of the disconnected lower chain, and both locking seats are provided with threaded holes, and the two locking seats are connected by screws connected to the threaded holes.

[0013] The beneficial effects achieved by the utility model are:

[0014] First, the utility model designs a front sprocket, a rear sprocket and an upper and lower chain, and an upper chain locking mechanism and a lower chain synchronous tensioning mechanism are respectively installed at the front end of the upper chain and the rear end of the lower chain. The upper chain locking mechanism locks the fixed point of the front end of the upper chain with the fixed rod of the hydraulic cylinder and the outer arm; the rear end of the lower chain moves synchronously with the inner arm through the synchronous tensioning mechanism; in this way, when the telescopic rod stroke of the hydraulic cylinder is L, that is, the stroke of the front sprocket and the rear sprocket is L, since the fixed point of the front end of the upper chain is locked, the stroke of the inner arm relative to the rear sprocket is also L, that is, the stroke of the inner arm is 2L, thereby realizing the amplification of the stroke of the inner arm, and realizing a long telescopic effect by using a shorter hydraulic cylinder stroke, thereby improving the stroke limitation of the traditional hydraulic cylinder, increasing the operating range of the boom, and reducing energy consumption.

[0015] Second, the design of the upper chain locking mechanism, through the setting of the locking block, enhances the fixity of the upper chain and ensures the stability of the telescopic arm in the locked state. Through the design of the locking pin and the upper chain connecting plate, a stable locking mechanism is provided, making the locking of the upper chain more secure and enhancing the stability of the overall structure.

[0016] Third, the upper chain locking mechanism provides a stable locking point through the fixed connection between the upper chain connecting plate and the base, which helps to improve the reliability and safety of the telescopic arm when locking. The setting of the support beam enhances the structural rigidity between the front sprocket and the rear sprocket, and improves the carrying capacity and deformation resistance of the telescopic arm mechanism.

[0017] Fourth, the design of the chain synchronous tensioning mechanism realizes the synchronous tensioning of the inner arm and the lower chain through the cooperation of the locking seat and the inner arm fixing pin, ensuring the synchronization and stability of the telescopic arm; by setting a locking seat at the two free ends of the lower chain and connecting them through a screw, a reliable tensioning and fixing mechanism is provided, which makes the tensioning state of the lower chain more stable and enhances the overall performance of the telescopic arm mechanism.

[0018] Fifth, the V-shaped rear sprocket connecting plate design improves the stability of the rear sprocket and reduces the deviation of the chain, thereby improving the accuracy and durability of the entire telescopic arm stroke amplification mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the extended hydraulic cylinder assembly and the hydraulic cylinder stroke amplification assembly;

[0020] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the hydraulic cylinder stroke amplification assembly;

[0022] Figure 4 yes Figure 1 A schematic diagram of a first-person perspective structure looking up;

[0023] Figure 5 yes Figure 4 A magnified view of the structure at center;

[0024] Figure 6 yes Figure 1 A schematic diagram of a structure of a second perspective looking up;

[0025] Figure 7 yes Figure 6 A magnified view of the structure at B in the middle;

[0026] Figure 8 middle Figure 2 Schematic diagram of the perspective structure.

[0027] Numbers in the figure:

[0028] 1. Outer arm; 2. Inner arm; 3. Extended hydraulic cylinder assembly; 31. Hydraulic cylinder; 311. Fixed rod; 312. Telescopic rod; 32. Outer arm fixing pin; 33. Base; 4. Hydraulic cylinder stroke amplification assembly; 41. Rear sprocket; 411. Rear sprocket connecting plate; 412. Rear sprocket shaft; 42. Front sprocket; 421. Front sprocket shaft; 43. Upper chain; 44. Lower chain; 45. Upper chain connecting plate; 46. Upper chain locking mechanism; 461. Locking pin shaft; 462. Locking block; 47. Lower chain synchronous tensioning mechanism; 471. Locking seat; 472. Inner arm fixing pin; 473. Screw; 48. Support beam. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the utility model is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0030] Reference Figure 1-Figure 8 The utility model provides a telescopic arm stroke amplification mechanism, which includes a sleeved outer arm 1 and an inner arm 2, and is further provided with an extended hydraulic cylinder assembly 3, the extended hydraulic cylinder assembly 3 includes a base 33, a hydraulic cylinder 31 and an outer arm fixing pin 32; the hydraulic cylinder 31 includes a fixing rod 311 and a telescopic rod 312, and the fixing rod 311 is connected and fixed to the base 33; the outer arm 1 is fixedly connected to the base 33 through the outer arm fixing pin 32; a hydraulic cylinder stroke amplification assembly 4, the hydraulic cylinder stroke amplification assembly 4 includes a front sprocket 42 and a rear sprocket 41, the front sprocket 42 is fixedly connected to the telescopic rod 312; an upper chain 43 and a lower chain 44 are connected around the front sprocket 42 and the rear sprocket 41, the upper chain 43 is provided with an upper chain locking mechanism 46 at the front end, and the upper chain locking mechanism 46 is fixedly connected to the base 33; the lower chain 44 is provided with a lower chain synchronous tensioning mechanism 47 at the rear end, and the lower chain synchronous tensioning mechanism 47 is fixedly connected to the inner arm 2.

[0031] Preferably, two front sprockets 42 are provided, a front sprocket shaft 421 is provided between the two front sprockets 42, and the telescopic rod 312 is connected to the front sprocket shaft 421; two rear sprockets 41 are provided, a rear sprocket shaft 412 is provided between the two rear sprockets 41; two upper chains 43 and two lower chains 44 are provided accordingly.

[0032] An upper chain connecting plate 45 is provided between the upper chain locking mechanism 46 and the base 33, and the upper chain locking mechanism 46 is fixedly connected to the base 33 via the upper chain connecting plate 45. Two sets of upper chain locking mechanism 46 and upper chain connecting plate 45 are also preferably provided. A V-shaped rear sprocket connecting plate 411 is installed between the two rear sprockets 41.

[0033] The upper chain locking mechanism 46 includes locking blocks 462 respectively fixedly connected to the two upper chains 43. A locking pin 461 is arranged between the two locking blocks 462, and the upper chain connecting plate 45 is fixedly connected to the locking shaft. A V-shaped rear sprocket connecting plate 411 is installed between the two rear sprockets 41 to enhance the stability of the rear sprocket 41 and reduce chain deviation. A support beam 48 is arranged between the front sprocket 42 and the rear sprocket 41 to enhance the structural rigidity, improve the load-bearing capacity and the ability to resist deformation.

[0034] The lower chain synchronous tensioning mechanism 47 includes a locking seat 471 fixedly mounted on the lower chain 44, and an inner arm fixing pin 472 is provided on the locking seat 471, and the inner arm 2 is fixedly connected to the locking seat 471 through the inner arm fixing pin 472. There are two locking seats 471, which are respectively fixedly mounted on the two free ends of the disconnected lower chain 44, and the two locking seats 471 are both provided with threaded holes, and the two locking seats 471 are connected by a screw 473 connected to the threaded holes.

[0035] The setting of the locking seat 471 enhances the structural stability of the lower chain 44. The two locking seats 471 are connected by the screw 473 in the threaded hole, allowing the chain tension to be accurately adjusted, ensuring the adaptability and reliability of the telescopic arm under different working conditions. It effectively prevents the chain from being loosened or over-tensioned, and reduces the mechanism failure that may be caused by uneven chain tension. The design of the threaded hole and the screw 473 can easily check and adjust the tension state of the lower chain 44, simplifying maintenance work and reducing maintenance costs. Through the coordinated use of the locking seat 471 and the screw 473, the deviation and wear of the chain are reduced, thereby improving the durability and service life of the entire telescopic arm stroke amplification mechanism.

[0036] When the utility model is in use, the fixed point at the front end of the upper chain 43 is locked with the fixed rod 311 of the hydraulic cylinder 31 and the outer arm 1 through the upper chain locking mechanism 46; the rear end of the lower chain 44 moves synchronously with the inner arm 2 through the synchronous tensioning mechanism; in this way, when the telescopic rod 312 of the hydraulic cylinder 31 is extended, the front sprocket 42 and the rear sprocket 41 are driven to move forward. When the stroke is L, that is, the stroke of the front sprocket 42 and the rear sprocket 41 is L, since the fixed point at the front end of the upper chain 43 is locked, the stroke of the inner arm 2 relative to the rear sprocket 41 is also L, that is, the stroke of the inner arm 2 is 2L, thereby achieving an amplified stroke of the inner arm 2, and a long telescopic effect can be achieved by using a shorter stroke of the hydraulic cylinder 31.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A telescopic arm stroke amplification mechanism, comprising a sleeved outer arm and an inner arm, characterized in that: It also provides: An extended hydraulic cylinder assembly, the extended hydraulic cylinder assembly comprising a base, a hydraulic cylinder and an outer arm fixing pin; the hydraulic cylinder comprises a fixing rod and a telescopic rod, the fixing rod is connected and fixed to the base; the outer arm is fixedly connected to the base via the outer arm fixing pin; A hydraulic cylinder stroke amplification assembly, wherein the hydraulic cylinder stroke amplification assembly comprises a front sprocket and a rear sprocket, wherein the front sprocket is fixedly connected to the telescopic rod; An upper chain and a lower chain are connected around the front sprocket and the rear sprocket, and an upper chain locking mechanism is arranged at the front end of the upper chain, and the upper chain locking mechanism is fixedly connected to the base; A lower chain synchronous tensioning mechanism is arranged at the rear end of the lower chain, and the lower chain synchronous tensioning mechanism is fixedly connected to the inner arm.

2. The telescopic arm stroke amplification mechanism according to claim 1, characterized in that: There are two front sprockets, a front sprocket shaft is arranged between the two front sprockets, and the telescopic rod is connected to the front sprocket shaft; there are two rear sprockets, a rear sprocket shaft is arranged between the two rear sprockets; two upper chains and two lower chains are correspondingly arranged.

3. The telescopic arm stroke amplification mechanism according to claim 1, characterized in that: An upper chain connecting plate is arranged between the upper chain locking mechanism and the base, and the upper chain locking mechanism is fixedly connected to the base through the upper chain connecting plate.

4. The telescopic arm stroke amplification mechanism according to claim 2, characterized in that: A V-shaped rear sprocket connecting plate is installed between the two rear sprockets.

5. The telescopic arm stroke amplification mechanism according to claim 2, characterized in that: The upper chain locking mechanism comprises locking blocks which are respectively fixedly connected to the two upper chains.

6. The telescopic arm stroke amplification mechanism according to claim 5, characterized in that: A locking pin is arranged between the two locking blocks.

7. The telescopic arm stroke amplification mechanism according to claim 1, characterized in that: A support beam is arranged between the front sprocket and the rear sprocket.

8. The telescopic arm stroke amplification mechanism according to claim 1, characterized in that: The lower chain synchronous tensioning mechanism comprises a locking seat fixedly mounted on the lower chain, an inner arm fixing pin is arranged on the locking seat, and the inner arm is fixedly connected to the locking seat via the inner arm fixing pin.

9. The telescopic arm stroke amplification mechanism according to claim 8, characterized in that: Two locking seats are provided, which are respectively fixedly installed on the two free ends of the disconnected lower chain, and the two locking seats are both provided with threaded holes, and the two locking seats are connected by screws connected in the threaded holes.

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