crane

Abstract

The present invention provides a crane, which includes a turntable, a fixed arm and a folding arm. The front end of the turntable is hinged with a mast and a superlift mast, and a superlift counterweight mechanism is suspended from the top of the superlift mast. The fixed arm extends backward from the tail of the turntable. The front end of the folding arm is connected to the rear end of the fixed arm. The folding arm drives the superlift counterweight mechanism to move backward in an extended state and is spaced from the end of the mast in a folded state. In the present invention, a fixed arm is added between the folding arm and the turntable. The fixed arm increases the distance between the turntable and the tail of the mast and the folding arm, leaving more room for movement for the folding arm and the mast, eliminating the contradiction between the travel range requirement of the folding arm and the mast length requirement, increasing the maximum amplitude of the superlift counterweight mechanism torque change in the superlift working condition, and the mast in the non-superlift working condition can be made longer, improving the stress of the remaining components, thereby improving the user's requirement for a larger mast length arm in the non-superlift working condition.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and in particular relates to a crane. Background Art

[0002] For crawler cranes configured for superlifting conditions, a superlifting counterweight luffing device is usually provided to change the distance of the superlifting counterweight relative to the crane's rotation center, in order to meet the requirements of different operating conditions for the stability of the entire machine. For crawler cranes that are equipped with a folding superlifting counterweight luffing device, it is usually necessary to consider the layout of the folding luffing device. When the folding luffing device is retracted to the minimum amplitude of the superlifting counterweight, the travel range of the folding luffing device cannot interfere with the mast on the crane, so the mast length requirement should not be set too long. However, when the crane is in a non-superlifting condition, when the boom is raised in a long boom condition, the longer the mast length, the greater the torque generated by the pull plate between the mast and the main boom on the main boom root boom hinge point, and the operation can be completed with less pull plate force and luffing rope force. When using the existing partially foldable superlift counterweight luffing device, the mast needs to be set into sections, and the length of the mast is changed by disassembling and assembling the middle connecting section of the mast to meet the different length requirements of the mast in standard operating conditions and superlifting operating conditions. Such operation is very complicated, and the mast needs to be disassembled when switching working conditions, which greatly increases the difficulty of mast installation. Summary of the invention

[0003] The main purpose of the present invention is to provide a crane, aiming to solve the technical problem in the prior art that the travel range requirement of the folding arm of the crane is inconsistent with the mast length requirement.

[0004] In order to achieve the above-mentioned object, the present invention provides a crane, wherein the crane comprises a turntable, a fixed arm and a folding arm. The front end of the turntable is hinged with a mast and a superlift mast, and a superlift counterweight mechanism is suspended from the top of the superlift mast; the fixed arm extends backward from the tail of the turntable; the front end of the folding arm is connected to the rear end of the fixed arm, and the folding arm drives the superlift counterweight mechanism to move backward in the extended state and is spaced from the end of the mast in the folded state.

[0005] In an embodiment of the present invention, the crane further comprises a vertical telescopic oil cylinder, which is detachably connected to the rear end of the fixed arm and extends toward the ground.

[0006] In an embodiment of the present invention, the crane further comprises an auxiliary counterweight mechanism, which comprises an auxiliary counterweight block and an auxiliary counterweight block storage assembly suspended at the bottom end of the vertical telescopic cylinder.

[0007] In an embodiment of the present invention, the vertical telescopic cylinder includes a piston rod end and a cylinder end, the cylinder end is detachably connected to the rear end of the fixed arm, and the piston rod end extends downward. The crane also includes a support seat and a support rod, the support seat is connected to the bottom end of the piston rod end, and the two ends of the support rod are respectively connected to the cylinder end and the fixed arm.

[0008] In an embodiment of the present invention, the crane also includes a first pull plate and a second pull plate, wherein the two ends of the first pull plate are respectively connected to the super-lifting counterweight mechanism and the rear end of the super-lifting mast, and the two ends of the second pull plate are respectively connected to the rear end of the mast and the rear end of the super-lifting mast.

[0009] In an embodiment of the present invention, the super-lifting counterweight mechanism includes a super-lifting counterweight block and a super-lifting counterweight block storage assembly, and the super-lifting counterweight block storage assembly is hinged to the rear end of the folding arm.

[0010] In the embodiment of the present invention, the rear end of the fixed arm is provided with a first mounting ear plate for connecting to the folding arm, and the front end is provided with a second mounting ear plate and a third mounting ear plate for connecting to the turntable.

[0011] In an embodiment of the present invention, the folding arm includes a first movable arm, a second movable arm and a folding arm telescopic cylinder. The first movable arm is hinged to the second movable arm. The folding arm telescopic cylinder is connected between the first movable arm and the second movable arm and is used to fold, contract or unfold and extend the folding arm.

[0012] In an embodiment of the present invention, the crane further comprises a fixed counterweight arranged at the rear end of the turntable.

[0013] In an embodiment of the present invention, the crane is a crawler crane.

[0014] Through the above technical solution, the crane provided by the embodiment of the present invention has the following beneficial effects:

[0015] The present invention is provided with a crane with a folding arm, and the folding arm can change the distance of the super-lifting counterweight mechanism relative to the rotation center of the crane turntable to meet the requirements of different working conditions for the stability of the whole machine. At the same time, in order to solve the technical problem that the travel range requirement of the folding arm is inconsistent with the mast length requirement, and to remove the restrictions of the crane on the mast length and the telescopic range of the folding arm, the present invention creatively adds a fixed arm between the folding arm and the turntable. The fixed arm increases the distance between the turntable and the tail of the mast and the folding arm, leaving a larger activity space for the folding arm and the mast, not only expanding the telescopic range of the folding arm, but also increasing the length setting range of the mast, thereby solving the contradiction between the variable amplitude travel range requirement of the folding arm and the mast length requirement, increasing the maximum amplitude of the torque change of the super-lifting counterweight mechanism in the super-lifting condition, and the mast in the non-super-lifting condition can be made longer, improving the stress of the remaining components, thereby enhancing the user's requirement for a larger mast length arm under non-super-lifting conditions.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 is a schematic structural diagram of a crane when the folding arm is retracted according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a crane when the folding arm is unfolded according to an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of an intermediate boom according to an embodiment of the present invention;

[0021] Figure 4 is a structural schematic diagram of a crane installed with a secondary counterweight mechanism according to one embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the installation structure of the auxiliary counterweight mechanism according to one embodiment of the present invention;

[0023] Figure 6 is a structural schematic diagram of a crane installing a supporting mechanism according to an embodiment of the present invention;

[0024] Figure 7 2 is a schematic diagram of the installation structure of the support mechanism according to an embodiment of the present invention.

[0025] Description of Reference Numerals

[0026]

[0027] DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] The present invention will be described below with reference to the accompanying drawings.

[0030] like Figure 1As shown, in an embodiment of the present invention, a crane is provided, wherein the crane includes a turntable 10, a fixed arm 20 and a folding arm 30; a mast 80 and a superlift mast 90 are hingedly connected at the front end of the turntable 10, and a superlift counterweight mechanism 40 is suspended from the top of the superlift mast 90; the fixed arm 20 extends backward from the tail of the turntable 10; the front end of the folding arm 30 is connected to the rear end of the fixed arm 20, and the folding arm 30 drives the superlift counterweight mechanism 40 to move backward in the extended state and is spaced apart from the end of the mast 80 in the folded state. The superlift counterweight mechanism 40 is used to balance the torque of the crane, and according to the weight change of the object lifted by the crane, the superlift counterweight mechanism 40 needs to adjust the torque to make the overall force of the crane reach a balanced state. Therefore, as Figure 1 and Figure 2 As shown, a folding arm 30 is installed between the super-lifting counterweight mechanism 40 and the turntable 10. The folding arm 30 changes the distance from the super-lifting counterweight mechanism 40 to the front end of the turntable 10 by extending or folding, so as to realize the torque amplitude change of the super-lifting counterweight mechanism 40. In addition, the crane in the present application can be divided into two working conditions: super-lifting and non-super-lifting. In the super-lifting working condition, the crane needs to articulate the mast 80 and the super-lifting mast 90 at the front end of the turntable 10. In the non-super-lifting working condition, only the kneeling rod needs to be installed to meet the mechanical properties required by the crane. In addition, the longer the length of the mast 80, the greater the torque generated by the pull plate between the mast 80 and the main arm on the root arm hinge point of the main arm, and the operation can be completed with less pull plate force and amplitude change rope force. However, the travel range requirement of the folding arm 30 conflicts with the length requirement of the mast 80. For example, Figure 1 As shown, the folding arm 30 continuously approaches the end of the mast 80 during the folding process. In order to avoid the folding arm 30 from colliding with the mast 80, the angle between the folding arm 30 and the turntable 10 cannot be too large, thereby limiting the telescopic range of the folding arm 30. The longer the mast 80 is, the greater the limitation on the telescopic range of the folding arm 30 is. The present invention creatively adds a fixed arm 20 between the folding arm 30 and the turntable 10, increases the distance between the turntable 10 and the tail of the mast 80 and the folding arm 30, and leaves a larger room for movement for the folding arm 30 and the mast 80. This not only expands the telescopic range of the folding arm 30, but also increases the length setting range of the mast 80, solves the contradiction between the amplitude variation range requirement of the folding arm 30 and the length requirement of the mast 80, increases the torque generated by the super-lifting counterweight mechanism 40 on the rotation center of the whole machine in the super-lifting condition, and can be made longer in the non-super-lifting condition, thereby improving the stress on the remaining components, thereby enhancing the user's requirement for a larger mast 80 length to lift the arm in the non-super-lifting condition.

[0031] It should be noted that although the above functions can be achieved by extending the length of the turntable 10 of the crane, the longer turntable 10 structure is easily limited by the transportation length during transportation, so the turntable 10 cannot be made too long. The fixed arm 20 in the present invention is not a part of the turntable 10. When the transportation length of the turntable 10 and the fixed arm 20 exceeds the limit, the fixed arm 20 can be disassembled from the turntable 10, and the fixed arm 20 and the turntable 10 can be transported separately.

[0032] In the embodiment of the present invention, the fixed arm 20 is used not only to increase the distance between the turntable 10 and the tail of the mast 80 and the folding arm 30, but also to install the auxiliary counterweight mechanism 60 or the support mechanism 50. The crane also includes a vertical telescopic cylinder 70 for controlling the height of the auxiliary counterweight mechanism 60 and the support mechanism 50 from the ground. The vertical telescopic cylinder 70 is detachably connected to the rear end of the fixed arm 20 and extends toward the ground.

[0033] In the embodiment of the present invention, the crane further includes a secondary counterweight mechanism 60, such as Figure 4 and Figure 5 As shown, a secondary counterweight mechanism 60 is installed under the fixed arm 20 of the crane. The secondary counterweight mechanism 60 includes a secondary counterweight block 61 and a secondary counterweight block storage assembly 62 suspended at the bottom end of the vertical telescopic cylinder 70. According to the needs of the crane moment balance, a suitable number of secondary counterweight blocks 61 can be placed in the secondary counterweight block storage assembly 62 to change the weight of the secondary counterweight mechanism 60. In the super-lifting condition, the crane can use the secondary counterweight mechanism 60 to expand new working conditions and give full play to the lifting performance of the crane determined by stability. For example, when the main arm of the crane is shorter or the weight hung on the hook of the main arm boom is lighter, the torque on the main arm is smaller. At this time, if there is still a heavier counterweight block on the super-lifting counterweight mechanism 40, it is easy to cause the crane to tip backward, so the super-lifting counterweight mechanism 40 must be placed on the ground, which will affect the walking of the crane and the rotation of the turntable 10. At this time, the auxiliary counterweight mechanism 60 can play its unique role. Since the distance between the auxiliary counterweight mechanism 60 and the turntable 10 is smaller than the distance between the super-lift counterweight mechanism 40 and the turntable 10, the rearward tipping moment generated by the additional counterweight is much smaller than the rearward tipping moment generated by the super-lift counterweight mechanism 40 of the same weight. When the crane removes the counterweight block of the super-lift counterweight mechanism 40 and installs the auxiliary counterweight mechanism 60 on the fixed arm 20, the vertical telescopic cylinder 70 controls the auxiliary counterweight mechanism 60 to maintain a certain height from the ground, making it easier for the crane to keep the counterweight from falling to the ground, which is convenient for rotation and walking. In addition, the crane with the super-lift counterweight mechanism 40 and the auxiliary counterweight mechanism 60 has a higher lifting performance determined by stability than the conventional crane without the super-lift counterweight mechanism 40 and the auxiliary counterweight mechanism 60.

[0034] In the embodiment of the present invention, the crane further comprises a supporting mechanism 50, such as Figure 6 and Figure 7 As shown, a support mechanism 50 is installed under the fixed arm 20 of the crane, and the support mechanism 50 includes a support seat 51 for contacting the ground and a support rod 52 for enhancing the structural stability. The vertical telescopic oil cylinder 70 includes a piston rod end 71 and a cylinder end 72. The cylinder end 72 is detachably connected to the rear end of the fixed arm 20, and the piston rod end 71 extends downward. Among them, the support seat 51 is connected to the bottom end of the piston rod end 71. The vertical telescopic oil cylinder 70 adjusts the height of the support seat 51 by controlling the telescopic movement of the piston rod end 71, so that the support seat 51 keeps touching the ground when the crane is at risk of tipping over backwards. On the one hand, it can improve the force condition of the support at the tail of the turntable 10, and on the other hand, it can prevent the crane from tipping over backwards. The two ends of the support rod 52 are respectively connected to the cylinder end 72 and the fixed arm 20. Since the support mechanism 50 may need to bear a larger supporting force under different working conditions, the support rod 52 is provided to stabilize the connection between the vertical telescopic cylinder 70 and the fixed arm 20, keep the vertical telescopic cylinder 70 vertically downward and have no position deviation when bearing pressure, thereby improving the stability of the entire support mechanism 50.

[0035] In the embodiment of the present invention, the crane further includes a first pull plate 11 and a second pull plate 12, the two ends of the first pull plate 11 are respectively connected to the rear ends of the superlift counterweight mechanism 40 and the superlift mast 90, and the two ends of the second pull plate 12 are respectively connected to the rear ends of the mast 80 and the superlift mast 90. The superlift counterweight mechanism 40 and the mast 80 are connected to the superlift mast 90 by the first pull plate 11 and the second pull plate 12, and the force of the superlift counterweight mechanism 40 and the mast 80 is transmitted to the top of the superlift mast 90, so that the pulling force of the superlift mast 90 can be increased when the crane is hoisting, thereby ensuring the pulling force balance of the crane.

[0036] In an embodiment of the present invention, the super-lifting counterweight mechanism 40 includes a super-lifting counterweight block 41 and a super-lifting counterweight block storage assembly 42. The super-lifting counterweight block storage assembly 42 is hinged to the rear end of the folding arm 30. The super-lifting counterweight block 41 can be added to the super-lifting counterweight block storage assembly 42 according to actual needs to change the weight of the super-lifting counterweight mechanism 40.

[0037] In the embodiment of the present invention, the rear end of the fixed arm 20 is provided with a first mounting ear plate 21 for connecting to the folding arm 30, and the front end is provided with a second mounting ear plate 22 and a third mounting ear plate 23 for connecting to the turntable 10. Figure 3 As shown, the first mounting ear plate 21 is provided with a folding arm mounting hole 211 for hinged connection with the folding arm 30 and a cylinder mounting hole 212 for connecting the vertical telescopic cylinder 70, and the second mounting ear plate 22 and the third mounting ear plate 23 are both provided with a turntable connecting hole 221 for connecting the turntable 10. In addition, the fixed arm 20 also includes a fourth mounting ear plate 24 for connecting the support rod 52, and the fourth mounting ear plate 24 is provided with a support rod mounting hole 241.

[0038] In an embodiment of the present invention, the folding arm 30 includes a first movable arm 31, a second movable arm 32 and a folding arm telescopic cylinder 33. The first movable arm 31 is hinged to the second movable arm 32. The folding arm telescopic cylinder 33 is connected between the first movable arm 31 and the second movable arm 32 and is used to fold, contract or unfold and extend the folding arm 30. The two ends of the first movable arm 31 are respectively hinged to the second movable arm 32 and the fixed arm 20. The two ends of the second movable arm 32 are respectively hinged to the first movable arm 31 and the super-lifting counterweight mechanism 40. Figure 1 In the embodiment, when the folding arm 30 of the crane is retracted, the folding arm telescopic cylinder 33 is retracted to the shortest state, the angle between the first movable arm 31 and the second movable arm 32 becomes smaller, the length of the folding arm 30 is reduced accordingly, the distance between the super-lifting counterweight mechanism 40 and the turntable 10 is shortened, and the torque of the super-lifting counterweight mechanism 40 is reduced; Figure 2 When the folding arm 30 of the crane is extended, the folding arm telescopic cylinder 33 is extended to the longest state, the angle between the first movable arm 31 and the second movable arm 32 becomes larger, the length of the folding arm 30 becomes larger accordingly, the distance between the super-lifting counterweight mechanism 40 and the turntable 10 is increased, and the torque of the super-lifting counterweight mechanism 40 increases. The torque variation of the super-lifting counterweight mechanism 40 is achieved by the above-mentioned folding arm 30, and the operation is simple and convenient. When the super-lifting counterweight mechanism 40 needs to be adjusted in a direction away from the crane turntable 10, the operator drives the folding arm telescopic cylinder 33, and the folding arm telescopic cylinder 33 drives the first movable arm 31 and the second movable arm 32 to produce a connection angle change to extend the folding arm 30, thereby pushing the super-lifting counterweight mechanism 40 in a direction away from the crane turntable 10; accordingly, when the super-lifting counterweight mechanism 40 needs to be adjusted in a direction close to the crane turntable 10, the operator drives the folding arm telescopic cylinder 33, and the folding arm telescopic cylinder 33 drives the first movable arm 31 and the second movable arm 32 to produce a connection angle change to shorten the folding arm 30, thereby pushing the super-lifting counterweight mechanism 40 in a direction close to the crane turntable 10.

[0039] In an embodiment of the present invention, the crane also includes a fixed counterweight 13 arranged at the rear end of the turntable 10. When the crane is in a non-super-lifting condition, the super-lifting mast 90 and the super-lifting counterweight mechanism 40 are removed from the turntable 10 of the crane, and the torque balance of the crane mainly relies on the fixed counterweight 13 at the rear end of the turntable 10.

[0040] In the embodiment of the present invention, the crane is a crawler crane. Crawler cranes are generally composed of a main arm, a turntable 10 and a chassis. The main arm is a multi-section assembled truss structure. The length can be changed by adjusting the number of sections. The lower end of the main arm is hinged to the front of the turntable 10, and the wire rope at the top of the main arm is used for the crane to lift heavy objects; the turntable 10 is mounted on the chassis through a slewing support, and the entire weight of the turntable 10 can be transferred to the chassis. Various equipment such as the power device, transmission system, and operating mechanism of the crane are installed on it, and the turntable 10 can rotate freely 360° around the connection between itself and the chassis; the chassis is both the traveling mechanism of the crane and the support mechanism 50 of the crane on the ground. The mast 80, the superlift mast 90 and the counterweights in the technical solution are all set to maintain torque balance with the main arm to prevent the large difference in the front and rear torques of the crane from causing damage to the chassis and tipping of the crane. In the non-superlift working condition, the mast 80 and the main arm are connected by a pull plate.

[0041] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A crane, characterized in that: The crane comprises: A turntable (10) has a mast (80) and a super-lifting mast (90) hingedly connected at its front end, and a super-lifting counterweight mechanism (40) is suspended at the top of the super-lifting mast (90); A fixed arm (20) extending backward from the tail of the turntable (10); a folding arm (30), wherein the front end of the folding arm (30) is connected to the rear end of the fixed arm (20), the folding arm (30) drives the superlift counterweight mechanism (40) to move backward in an extended state, and is spaced apart from the end of the mast (80) in a folded state; A vertical telescopic oil cylinder (70), the vertical telescopic oil cylinder (70) is detachably connected to the rear end of the fixed arm (20) and extends toward the ground, the vertical telescopic oil cylinder (70) comprises a piston rod end (71) and a cylinder end (72), the cylinder end (72) is detachably connected to the rear end of the fixed arm (20), and the piston rod end (71) extends downward; The auxiliary counterweight mechanism (60) comprises an auxiliary counterweight block (61) and an auxiliary counterweight block storage assembly (62) suspended at the bottom end of the vertical telescopic oil cylinder (70).

2. The crane according to claim 1, characterized in that: The crane further comprises a support seat (51) and a support rod (52), wherein the support seat (51) is connected to the bottom end of the piston rod end (71), and the two ends of the support rod (52) are respectively connected to the cylinder end (72) and the fixed arm (20).

3. The crane according to claim 1, characterized in that: The crane further comprises a first pull plate (11) and a second pull plate (12), wherein two ends of the first pull plate (11) are respectively connected to the superlift counterweight mechanism (40) and the rear end of the superlift mast (90), and two ends of the second pull plate (12) are respectively connected to the rear end of the mast (80) and the rear end of the superlift mast (90).

4. The crane according to claim 1, characterized in that: The super-lifting counterweight mechanism (40) comprises a super-lifting counterweight block (41) and a super-lifting counterweight block storage assembly (42), and the super-lifting counterweight block storage assembly (42) is hinged to the rear end of the folding arm (30).

5. The crane according to any one of claims 1 to 4, characterized in that: The rear end of the fixed arm (20) is provided with a first mounting ear plate (21) for connecting to the folding arm (30), and the front end is provided with a second mounting ear plate (22) and a third mounting ear plate (23) for connecting to the turntable (10).

6. The crane according to claim 5, characterized in that: The folding arm (30) comprises a first movable arm (31), a second movable arm (32) and a folding arm telescopic cylinder (33); the first movable arm (31) is hinged to the second movable arm (32); the folding arm telescopic cylinder (33) is connected between the first movable arm (31) and the second movable arm (32) and is used to fold, contract or unfold and extend the folding arm (30).

7. The crane according to claim 6, characterized in that The crane further comprises a fixed counterweight (13) arranged at the rear end of the turntable (10).

8. The crane according to claim 6, characterized in that: The crane is a crawler crane.

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