Full-gear pressure-limited crane

Abstract

The utility model discloses a full gear limit voltage's crane, including the chassis and setting up the support rod on the chassis, the lower extreme of support rod is fixedly connected on the chassis, and the drive end of oil pump is fixedly connected on the jib, and the one end of jib is open and has the hollow structure inside, is provided with the extension arm in the hollow structure, is equipped with first fixed through -hole, second fixed through -hole, third fixed through -hole and fourth fixed through -hole on jib spacing apart along the length direction, and the interval between first fixed through -hole and second fixed through -hole, the interval between second fixed through -hole and third fixed through -hole, the interval between third fixed through -hole and fourth fixed through -hole is determined according to the rated load, and is equipped with mounting hole on the extension arm, and the mounting hole is installed fixedly through the fixed part between first first fixed through -hole, second fixed through -hole, third fixed through -hole and fourth fixed through -hole. The utility model designs, determines the corresponding load according to the length of the force arm of each gear, and designs the structure strength of crane based on this, ensures the safe use.

Description

Technical Field

[0001] This utility model relates to a crane with full-range pressure limiting, belonging to the field of crane technology. Background Technology

[0002] Depending on the total length of the boom, the lifting capacity of the crane varies. Existing cranes generally have four adjustable lifting levels. A boom extension rod is fitted inside the boom, allowing it to slide within the boom to adjust its total length. It is locked in place with a pin. The rated lifting capacity is 2 tons when the boom is at its shortest length. As the boom extension rods extend outwards, the rated lifting capacity decreases sequentially to 1.5 tons, 1 ton, and 0.5 tons. The crane's strength is designed and manufactured according to this standard. To ensure safe operation, the hydraulic pump, which serves as the crane's power source, is equipped with a safety relief valve. When the system pressure inside the pump exceeds a set value, the safety valve opens, directly draining the hydraulic oil into the tank, ensuring the system pressure does not exceed the allowable value and preventing accidents due to excessive pressure.

[0003] The existing crane's hydraulic pump pressure setting is based on the maximum lifting capacity, such as 2 tons. When the load exceeds the setting, the relief valve opens to release pressure, and the crane stops working to prevent overload and various safety accidents. However, for other settings (i.e., when the extension boom is extended outwards), the length of the extended lever arm is not proportional to the decrease in the rated load. For example, when the boom is extended to its longest position, i.e., the rated load is 0.5 tons, the working length L4 of the boom in the horizontal position should be four times the length L1 when the load is 2 tons for the hydraulic pump's safety valve to open and release pressure. However, the actual boom length of the existing crane is much less than four times the length L1 when the load is 2 tons, or even less than twice. This causes the safety valve to fail when the crane is overloaded in this setting, posing a significant safety hazard (this problem exists in all settings except the highest load setting). Utility Model Content

[0004] To address the technical problem that existing cranes can only limit pressure at the maximum lifting load, while the set pressure limit of the oil pump in other gears is much higher than the rated lifting load of the corresponding gear, posing a considerable safety hazard, this utility model proposes a crane with full-gear pressure limiting, which designs and determines the rated lifting load of each gear according to the crane boom length.

[0005] The technical solution adopted in this utility model is: A crane with full-range pressure limiting includes a base frame (1) and a support rod (2) mounted on the base frame (1). The lower end of the support rod (2) is fixed to the base frame (1), and the upper end is fixed to a column (3). The lower end of the column (3) is fixed to the base frame (1), and the upper end is hinged to one end of the boom (5). An oil pump (4) is provided in the middle of the column (3). The bottom of the oil pump (4) is hinged to the column (3), and the piston rod of the oil pump is hinged to the boom (5). The boom (5) is characterized in that one end is open and has a hollow structure inside. An extension arm (6) is provided inside the hollow structure, and the extension arm (6) is inserted into the central control structure. The boom (5) has several fixing holes spaced apart along its length, and the spacing between adjacent fixing holes is determined according to the rated load. The extension arm (6) has mounting holes, and the end of the boom (5) closer to the column is defined as the inner side, and the end farther from the column is defined as the outer side. The mounting holes on the extension arm are fixed sequentially from the inside to the outside. When the working length of the boom is L1 at the first fixed through hole position, L2 at the second fixed through hole position, L3 at the third fixed through hole position, and L4 at the fourth fixed through hole position, and so on, they correspond to each rated load. The mounting holes and corresponding fixing holes are fixed together by fasteners (8).

[0006] Furthermore, the number of fixed holes is four, namely the first fixed through hole, the second fixed through hole, the third fixed through hole and the fourth fixed through hole. The distance between the first fixed through hole and the second fixed through hole, the distance between the second fixed through hole and the third fixed through hole, and the distance between the third fixed through hole and the fourth fixed through hole are determined according to the rated load. The extension arm (6) is provided with mounting holes. The end of the boom (5) closer to the column is defined as the inner side, and the end farther from the column is defined as the outer side. The mounting holes on the extension arm are fixed sequentially from the inside to the outside. When the working length of the boom is L1 at the first fixed through hole position, L2 at the second fixed through hole position, L3 at the third fixed through hole position and L4 at the fourth fixed through hole position, they correspond to the rated load of each gear. The multiples of the working lengths L2, L3 and L4 of the boom with L1 are determined as: the quotient of the rated load corresponding to the L1 position and the rated load corresponding to the L2, L3 and L4 positions respectively. The mounting holes are fixed to the first, second, third and fourth fixing through holes by fasteners (8).

[0007] Furthermore, when the rated loads of each gear are determined to be 2 tons, 1.5 tons, 1.3 tons, and 1.1 tons, the working lengths L2, L3, and L4 of the boom at each gear are respectively determined to be 1.33 times, 1.54 times, and 1.82 times the working length L1 of the boom when the load is 2 tons.

[0008] Furthermore, one end of the base frame (1) is provided with a drag leg (9), and the end of the drag leg (9) away from the base frame (1) is provided with a front wheel (11); the two ends of the base frame are respectively provided with a middle wheel (12) and a rear wheel (13) for easy movement.

[0009] Furthermore, the fastener is a pin.

[0010] Furthermore, a hook (7) is provided at the end of the extension arm (6) away from the boom.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention determines the total length of the boom (the length of the boom plus the extension arm) according to the required lifting load. That is, the distance between the holes is not fixed (it may be equal or unequal). When the lifting load of all gears is greater than the set load, the safety valve of the oil pump will activate to unload the load, and the crane will not lift, thus ensuring safe use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0013] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0015] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0021] refer to Figure 1This utility model discloses a full-range pressure-limiting crane, comprising a base frame 1 and a support rod 2 mounted on the base frame 1. The lower end of the support rod 2 is fixed to the base frame 1, and the upper end is fixed to a column 3. The lower end of the column 3 is fixed to the base frame 1, and the upper end is hinged to one end of the boom 5. An oil pump 4 is provided in the middle of the column 3, the bottom of the oil pump 4 is hinged to the column 3, and the piston rod of the oil pump is hinged to the boom 5. One end of the boom 5 is open and has a hollow structure inside. An extension arm 6 is provided inside the hollow structure and is inserted into the central control structure. The boom 5 has a number of fixing holes spaced along its length, with four fixing holes in total: a first fixing through hole, a second fixing through hole, a third fixing through hole, and a fourth fixing through hole. The spacing between the first and second fixing through holes, the spacing between the second and third fixing through holes, and the spacing between the third and fourth fixing through holes are determined according to the rated load. The extension arm 6 has mounting holes, with the end of the boom 5 closer to the column defined as the inner side and the end farther from the column defined as the outer side. The mounting holes on the extension arm are fixed sequentially from the inside to the outside. When the working length of the boom is L1 at the first fixing through hole position, L2 at the second fixing through hole position, L3 at the third fixing through hole position, and L4 at the fourth fixing through hole position, they correspond to the rated loads of each position. The ratios of the working lengths L2, L3, and L4 of the boom to L1 are determined as the quotients of the rated load at position L1 and the rated loads at positions L2, L3, and L4, respectively.

[0022] The mounting holes are fixed to the first, second, third, and fourth fixing through holes by fasteners 8.

[0023] In one embodiment, when the rated load of each gear is determined to be 2 tons, 1.5 tons, 1.3 tons, and 1.1 tons, the working lengths L2, L3, and L4 of the boom at each gear are determined to be 1.33 times, 1.54 times, and 1.82 times the working length L1 of the boom when it is 2 tons, respectively, to ensure that the safety valve opens to unload when the crane is overloaded at each gear, thus ensuring safe use.

[0024] In one embodiment, a drag leg 9 is provided at one end of the base frame 1, and a front wheel 11 is provided at the end of the drag leg 9 away from the base frame 1; a middle wheel 12 and a rear wheel 13 for easy movement are respectively provided at both ends of the base frame.

[0025] In one embodiment, the fastener is a pin.

[0026] In one embodiment, a hook 7 is provided at the end of the extension arm 6 away from the boom.

[0027] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A crane with full-range pressure limiting, comprising a base frame (1) and a support rod (2) mounted on the base frame (1), the lower end of the support rod (2) being fixedly connected to the base frame (1) and the upper end being fixedly connected to a column (3); the lower end of the column (3) being fixedly connected to the base frame (1), and the upper end being hinged to one end of a boom (5); an oil pump (4) is provided in the middle of the column (3), the bottom of the oil pump (4) being hinged to the column (3), and the piston rod of the oil pump being hinged to the boom (5); characterized in that, The boom (5) has an open end and a hollow structure inside. An extension arm (6) is provided inside the hollow structure and is inserted into the central control structure. The boom (5) has several fixing holes spaced apart along its length. The spacing between adjacent fixing holes is determined according to the rated load. The extension arm (6) has mounting holes. The end of the boom (5) closer to the column is defined as the inner side, and the end farther from the column is defined as the outer side. The mounting holes on the extension arm are fixed sequentially from the inside to the outside. When the working length of the boom is L1 at the first fixed through hole position, L2 at the second fixed through hole position, L3 at the third fixed through hole position, and L4 at the fourth fixed through hole position, the working length of the boom is L4, and so on, corresponding to each rated load. The mounting holes and corresponding fixing holes are fixed together by fasteners (8).

2. The crane with full-range pressure limiting as described in claim 1, characterized in that, The number of fixed holes is four, namely the first fixed through hole, the second fixed through hole, the third fixed through hole and the fourth fixed through hole. The distance between the first fixed through hole and the second fixed through hole, the distance between the second fixed through hole and the third fixed through hole, and the distance between the third fixed through hole and the fourth fixed through hole are determined according to the rated load. The extension arm (6) is provided with mounting holes. The end of the boom (5) closer to the column is defined as the inner side, and the end farther from the column is defined as the outer side. The mounting holes on the extension arm are fixed from the inside to the outside in sequence. When the working length of the boom is L1 at the first fixed through hole position, L2 at the second fixed through hole position, L3 at the third fixed through hole position and L4 at the fourth fixed through hole position, they correspond to the rated load of each gear. The ratio of the working length of the boom L2, L3 and L4 to L1 is determined as: the quotient of the rated load corresponding to the L1 position and the rated load corresponding to the L2, L3 and L4 positions respectively. The mounting holes are fixed to the first fixed through hole, the second fixed through hole, the third fixed through hole and the fourth fixed through hole by fasteners (8).

3. A crane with full-range pressure limiting as described in claim 1, characterized in that, When the rated loads of each gear are determined to be 2 tons, 1.5 tons, 1.3 tons, and 1.1 tons, the working lengths L2, L3, and L4 of the boom in each gear are determined to be 1.33 times, 1.54 times, and 1.82 times the working length L1 of the boom when the load is 2 tons, respectively.

4. A crane with full-range pressure limiting as described in claim 1, characterized in that, One end of the base frame (1) is provided with a drag leg (9), and the end of the drag leg (9) away from the base frame (1) is provided with a front wheel (11); the two ends of the base frame are respectively provided with a middle wheel (12) and a rear wheel (13) for easy movement.

5. A crane with full-range pressure limiting as described in claim 1, characterized in that, The fastener is a pin.

6. A crane with full-range pressure limiting as described in claim 1, characterized in that, The extension arm (6) is provided with a hook (7) at the end away from the boom.

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