Double-cylinder multi-section arm telescopic system and crane

Abstract

The utility model relates to a double-cylinder multi-section-arm telescopic system and a crane. The double-cylinder multi-section-arm telescopic system comprises a telescopic arm assembly, a telescopic oil cylinder, a telescopic arm mechanism and a telescopic arm mechanism, the extending arm mechanism comprises an extending arm pulley II arranged at the arm head of the fourth-section arm, an extending arm pulley III arranged at the arm tail of the fifth-section arm, an extending arm pulley IV arranged at the arm head of the fifth-section arm, and an extending arm inhaul cable II which bypasses the extending arm pulley II and the extending arm pulley III in sequence and connects the arm tail of the second-section arm with the arm head of the fourth-section arm; the extending arm inhaul cable III bypasses the extending arm pulley IV and is used for connecting the tail of the fourth-section arm with the head of the sixth-section arm; and the arm retracting mechanism comprises an arm retracting pulley III arranged at the arm tail of the fifth-section arm and an arm retracting inhaul cable III which bypasses the arm retracting pulley III and connects the arm head of the fourth-section arm with the arm tail of the sixth-section arm. The utility model has the advantages of high telescopic efficiency, simple telescopic control, high reliability, small stress on the inhaul cable, low cost and high hoisting capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting machinery, in particular to a double-cylinder rope-row type multi-section boom telescopic system and a crane. Background Art

[0002] At present, there are two main telescopic methods used for the boom of rope-type telescopic boom cranes, one is the telescopic method of single cylinder plus rope, and the other is the telescopic method of double cylinder plus rope. The cylinder rope boom has high working efficiency, simple structure and low price, but the rope force is doubled due to the amplification effect of the pulley, which seriously limits the crane's lifting performance. Among them, cranes with four sections and less mostly use single cylinder plus rope boom. This telescopic mechanism can achieve synchronous telescopic of the second, third and fourth sections of the boom; five-section boom cranes mostly use double cylinder plus rope boom. The second section of the boom and the third, fourth and fifth sections of the boom cannot be synchronously telescoped, the telescopic efficiency is low, and the cost and weight of the two-stage telescopic cylinder are high. Cranes with more than five sections of the boom currently generally use single cylinder pin-type booms. Although the lifting performance of this boom is not affected by the amplification effect of the pulley, the telescopic work efficiency is low, the structure is complex, and the price is high. It is currently only used on medium and large tonnage cranes.

[0003] Therefore, the existing small and medium-sized cranes with five sections or less use oil cylinder rope-type booms. The extension and retraction of the second section boom and the third, fourth and fifth sections booms require repeated switching of telescopic cylinders I and II, which is prone to misoperation and reduces the telescopic efficiency. The arm length is short and cannot complete the lifting of higher and farther working conditions. The cable is subject to large force and the carrying capacity is limited. Cranes with five sections or more use single-cylinder pin-type booms, which have low telescopic efficiency, complex structure and high price.

[0004] Patent No. CN202211672012.X discloses a boom and a jib crane equipped with the boom, and proposes a six-section oil cylinder rope-type boom telescopic system. Each boom section is connected to the telescopic arm cable by an oil cylinder to control the extension and retraction. A locking mechanism is set at the rear end of the six-section boom, so that the force on the boom cable is effectively reduced, thereby improving the overall bearing capacity of the boom. Although this solution applies a double-cylinder rope-type boom to a six-section boom crane, the locking mechanism of the last boom is limited by the position of the pin hole of the five-section boom, resulting in a limited extension length of the last boom and a limited arm length combination, which inhibits the free length combination telescopic characteristics of the rope-type boom, and the structure is complex. The boom cable will produce different degrees of elastic deformation due to different loads, and the locking mechanism is difficult to position, which has poor reliability and increases product costs.

[0005] Therefore, in order to address the problems of low telescopic efficiency, complex control, low reliability, large cable force and high cost in the existing telescopic systems of oil cylinder rope-type booms or single-cylinder pin-type booms used for five- or six-section booms, a double-cylinder multi-section boom telescopic system that can be applied to six-section booms or even more is proposed. The system has the advantages of high telescopic efficiency, simple telescopic control, high reliability, small cable force, low cost and high lifting capacity. Summary of the invention

[0006] The utility model aims to overcome the above-mentioned shortcomings and provide a double-cylinder multi-section arm telescopic system and a crane with high telescopic efficiency, simple telescopic control, high reliability, small cable force, low cost and high lifting capacity.

[0007] The purpose of the utility model is achieved in this way:

[0008] A double-cylinder multi-section boom telescopic system, comprising a boom extension assembly, a telescopic oil cylinder, a boom extension mechanism and a boom retracting mechanism; the boom extension assembly comprises 6 boom sections, namely, a one-section boom, a two-section boom, a three-section boom, a four-section boom, a five-section boom and a six-section boom; the telescopic oil cylinder comprises a telescopic oil cylinder I and a telescopic oil cylinder II, respectively controlling the extension and retraction of the two-section boom and the three-section boom; the boom extension mechanism and the boom retracting mechanism comprise multiple sets of cables and pulleys, controlling the extension and retraction of the remaining booms;

[0009] The boom mechanism comprises a boom pulley II arranged at the boom head of the four-section boom, a boom pulley III arranged at the boom tail of the five-section boom, a boom pulley IV arranged at the boom head of the five-section boom, a boom cable II which passes through the boom pulley II and the boom pulley III in sequence and connects the boom tail of the two-section boom and the boom head of the four-section boom, and a boom cable III which passes through the boom pulley IV and connects the boom tail of the four-section boom and the boom head of the six-section boom;

[0010] The retracting mechanism comprises a retracting pulley III arranged at the end of the five-section boom, and a retracting cable III which passes around the retracting pulley III and connects the end of the four-section boom and the end of the six-section boom.

[0011] Furthermore, the cylinder rod of the telescopic cylinder I is installed at the end of the arm of the first section arm, and the cylinder barrel is installed at the end of the arm of the second section arm; the cylinder rod of the telescopic cylinder II is installed at the end of the arm of the second section arm, and the cylinder barrel is installed at the end of the arm of the third section arm.

[0012] Furthermore, the boom mechanism also includes a boom pulley I arranged on the cylinder head of the telescopic cylinder II, and a boom cable I that bypasses the boom pulley I and connects the tail of the second-section boom and the tail of the fourth-section boom.

[0013] Furthermore, the arm retracting mechanism also includes an arm retracting pulley I arranged at the end of the three-section arm, and an arm retracting cable I that passes through the arm retracting pulley I and connects the cylinder head of the telescopic cylinder I and the arm head of the four-section arm.

[0014] Furthermore, the arm retracting mechanism also includes an arm retracting pulley II arranged at the end of the four-section arm, and an arm retracting cable II that bypasses the arm retracting pulley II and connects the cylinder head of the telescopic cylinder II and the arm head of the five-section arm.

[0015] Furthermore, the boom assembly includes N boom sections, which include the P-th boom, P-1 boom and P-2 boom which are slidably connected in sequence, N and P are both integers greater than 6, and N≥P; the boom mechanism includes a boom pulley P arranged at the boom head of the P-1 boom, a boom cable P which bypasses the boom pulley P and connects the P-2 boom tail with the P boom tail; the retracting mechanism includes a retracting pulley P arranged at the P-1 boom tail, a retracting cable P which bypasses the retracting pulley P and connects the P-2 boom head with the P boom tail.

[0016] A crane is provided with any one of the above-mentioned double-cylinder multi-section boom telescopic systems.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model rearranges the telescopic arm cables and increases the movable pulley of the boom, so that the stress on the boom cables is reduced, the lifting performance determined by the strength of the boom cables is improved, and the stress on the pulleys and bearings is reduced, the cross-sectional gap between each boom section is effectively reduced, and the lifting capacity of the boom is improved; at the same time, the advantages of high efficiency and low cost of the oil cylinder rope row telescopic mechanism are fully utilized, and the problem of doubling the stress on the boom cables due to the amplification effect of the boom pulley in the oil cylinder rope row telescopic mechanism is avoided. The cable stress is small, the lifting performance is significantly improved, and the utility model has good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of a six-section boom structure of a double-cylinder multi-section boom telescopic system.

[0020] Figure 2 It is a schematic diagram of the local structure of an N-section arm of a double-cylinder multi-section arm telescopic system of the utility model.

[0021] Figure 3 The utility model is a schematic diagram of a seven-section boom structure of a double-cylinder multi-section boom telescopic system.

[0022] in:

[0023] One-section boom 1, two-section boom 2, three-section boom 3, four-section boom 4, five-section boom 5, six-section boom 6, telescopic cylinder I7, telescopic cylinder II8, extension boom cable I9, extension boom cable II10, extension boom cable III11, retracted boom cable I12, retracted boom cable II13, retracted boom cable III14, extension boom pulley I15, extension boom pulley II16, extension boom pulley III17, extension boom pulley IV18, retracted boom pulley I19, retracted boom pulley II20, retracted boom pulley III21, P-section boom 22, P-1 section boom 23, P-2 section boom 24, extension boom pulley P25, extension boom cable P26, retracted boom pulley P27, retracted boom cable P28, seven-section boom 29, extension boom pulley V30, extension boom cable IV31, retracted boom pulley IV32, retracted boom cable IV33. DETAILED DESCRIPTION Example

[0024] See also Figure 1 The utility model relates to a double-cylinder multi-section boom telescopic system, comprising a boom extension assembly, a telescopic oil cylinder, a boom extension mechanism and a boom retracting mechanism; the boom extension assembly comprises 6 boom sections, namely, a first-section boom 1, a second-section boom 2, a third-section boom 3, a fourth-section boom 4, a fifth-section boom 5 and a sixth-section boom 6;

[0025] The telescopic cylinder comprises a telescopic cylinder I7 and a telescopic cylinder II8, wherein the cylinder rod of the telescopic cylinder I7 is installed at the end of the first-section boom 1, and the cylinder barrel is installed at the end of the second-section boom 2; the cylinder rod of the telescopic cylinder II8 is installed at the end of the second-section boom 2, and the cylinder barrel is installed at the end of the third-section boom 3; the telescopic cylinder I7 and the telescopic cylinder II8 control the telescopic movement of the second-section boom 2 and the third-section boom 3 respectively;

[0026] The arm extension mechanism and arm retracting mechanism include multiple sets of cables and pulleys to control the extension and retraction of the remaining arms; specifically, the arm extension mechanism includes an arm extension pulley I15 arranged at the cylinder head of the telescopic cylinder II8, an arm extension pulley II16 arranged at the arm head of the fourth arm 4, an arm extension pulley III17 arranged at the arm tail of the fifth arm 5, an arm extension pulley IV18 arranged at the arm head of the fifth arm 5, an arm extension cable I9 bypassing the arm extension pulley I15 and connecting the arm tail of the second-section arm 2 and the arm tail of the fourth-section arm 4, an arm extension cable II10 bypassing the arm extension pulley II16 and the arm extension pulley III17 in sequence and connecting the arm tail of the second-section arm 2 and the arm head of the fourth arm 4, and an arm extension cable III11 bypassing the arm extension pulley IV18 and connecting the arm tail of the fourth-section arm 4 and the arm head of the sixth-section arm 6;

[0027] When the telescopic cylinder I7 is extended, the second-section boom 2 is directly extended. When the telescopic cylinder II8 is extended, the third-section boom 3 is directly extended. At the same time, under the action of the boom pulley I15 and the boom cable I9, the fourth-section boom 4 is driven to extend outward. Under the action of the boom pulley II16 at the arm head of the fourth-section boom 4, the boom pulley III17 at the arm tail of the fifth-section boom 5 and the boom cable II10, the fifth-section boom 5 is driven to extend outward. Under the action of the boom pulley IV18 at the arm head of the fifth-section boom 5 and the boom cable III11, the sixth-section boom 6 is driven to extend outward, thereby realizing the synchronous extension of the third, fourth, fifth and sixth-section booms.

[0028] The arm retracting mechanism comprises an arm retracting pulley I19 arranged at the end of the three-section arm 3, an arm retracting pulley II20 arranged at the end of the four-section arm 4, an arm retracting pulley III21 arranged at the end of the five-section arm 5, an arm retracting cable I12 bypassing the arm retracting pulley I19 and connecting the cylinder head of the telescopic cylinder I7 and the arm head of the four-section arm 4, an arm retracting cable II13 bypassing the arm retracting pulley II20 and connecting the cylinder head of the telescopic cylinder II8 and the arm head of the five-section arm 5, and an arm retracting cable III14 bypassing the arm retracting pulley III21 and connecting the arm head of the four-section arm 4 and the arm end of the six-section arm 6;

[0029] When the telescopic cylinder I7 retracts, the second-section boom 2 is directly driven to retract. When the telescopic cylinder II8 retracts, the third-section boom 3 is driven to retract. The arm-retracting cable I12 connected to the cylinder head of the telescopic cylinder I7 bypasses the arm-retracting pulley I19 to drive the fourth-section boom 4 to retract. Similarly, the arm-retracting cable II13 connected to the cylinder head of the telescopic cylinder II8 bypasses the arm-retracting pulley II20 to drive the fifth-section boom 5 to retract. Under the action of the arm-retracting pulley III21 and the arm-retracting cable III14 at the tail of the fifth-section boom 5, the sixth-section boom 6 is driven to retract, thereby realizing the synchronous retraction of the third, fourth, fifth and sixth-section booms.

[0030] The boom pulley II, boom pulley III and boom cable II of the utility model are only used for pulling the five-section boom out, and are subjected to relatively small forces, so the structural dimensions of the boom pulley II and the specifications of the boom cable II can be reduced, and the cross-sectional dimensions of the five-section boom can be further increased, thereby increasing the lifting performance; the forces borne by the boom cable I and the boom cable II are both smaller than those borne by the traditional telescopic mechanism, and thus the lifting performance can be significantly increased; the telescopic structure of the double-cylinder multi-stage rope row is applied to the six-section boom, and the advantages of the cylinder rope row telescopic mechanism, such as high efficiency, simple control and low cost, are fully utilized, while at the same time the lifting performance of the boom is improved, and higher and farther lifting is achieved. Example

[0031] Based on the 6-section boom of the double-cylinder multi-section boom telescopic system of Example 1, the boom assembly is further expanded to an N-section boom, where N is an integer greater than 6, including the P-th boom 22, the P-1 boom 23 and the P-2 boom 24 which are sequentially slidably connected, and N and P are both integers greater than 6, and N≥P, see Figure 2The arm extension mechanism includes an arm extension pulley P25 arranged at the arm head of the P-1 arm 23, an arm extension cable P26 bypassing the arm extension pulley P25 and connecting the arm tail of the P-2 arm 24 and the arm tail of the P arm 22; the arm retracting mechanism includes an arm retracting pulley P27 arranged at the arm tail of the P-1 arm 23, and an arm retracting cable P28 bypassing the arm retracting pulley P27 and connecting the arm head of the P-2 arm 24 and the arm tail of the P arm 22;

[0032] See also Figure 3 The embodiment in which N is 7, i.e. a 7-section boom, is based on the 6-section boom of Embodiment 1, and an extending boom mechanism and a retracting boom mechanism are added to control the extension and retraction of the seven-section boom 29, specifically: an extending boom pulley V30 is provided at the arm head of the six-section boom 6, and a boom cable IV31 bypasses the extending boom pulley V30 and connects the arm tail of the five-section boom 5 and the arm tail of the seven-section boom 29; a retracting boom pulley IV32 is provided at the arm tail of the six-section boom 6, and a retracting boom cable IV33 bypasses the retracting boom pulley IV32 and connects the arm head of the five-section boom 5 and the arm tail of the seven-section boom 29. When the telescopic cylinder I7 and the retracting cylinder II8 are extended, the second, third, fourth, fifth and sixth booms are extended, and the seventh boom 29 is extended under the action of the boom pulley V30 and the boom cable IV31; when the telescopic cylinder I7 and the retracting cylinder II8 are retracted, the second, third, fourth, fifth and sixth booms are retracted, and the seventh boom 29 is retracted under the action of the retracting pulley IV32 and the retracting cable IV33;

[0033] The telescopic structure of the double-cylinder multi-stage rope row of the utility model can be applied to the telescopic structure of more-section booms. Compared with the traditional single-cylinder latch-type boom, it has the advantages of high telescopic efficiency, simple telescopic control, high reliability, small cable force and low cost. Example

[0034] A crane, whose lifting boom is equipped with any one of the double-cylinder multi-section boom telescopic systems in the above two embodiments, has the advantages of small cable force, good lifting performance, simple telescopic control, high telescopic efficiency, high reliability and low cost.

[0035] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A double-cylinder multi-section boom telescopic system, comprising a boom extension assembly, a telescopic oil cylinder, a boom extension mechanism and a boom retracting mechanism; the boom extension assembly comprises six boom sections, namely a one-section boom (1), a two-section boom (2), a three-section boom (3), a four-section boom (4), a five-section boom (5) and a six-section boom (6); the telescopic oil cylinder comprises a telescopic oil cylinder I (7) and a telescopic oil cylinder II (8), which respectively control the extension and retraction of the two-section boom (2) and the three-section boom (3); the boom extension mechanism and the boom retracting mechanism comprise a plurality of cables and pulleys, which control the extension and retraction of the remaining booms; characterized in that: The boom mechanism comprises a boom pulley II (16) arranged at the arm head of the four-section boom (4), a boom pulley III (17) arranged at the arm tail of the five-section boom (5), a boom pulley IV (18) arranged at the arm head of the five-section boom (5), a boom cable II (10) which passes through the boom pulley II (16) and the boom pulley III (17) in sequence and connects the arm tail of the two-section boom (2) and the arm head of the four-section boom (4), and a boom cable III (11) which passes through the boom pulley IV (18) and connects the arm tail of the four-section boom (4) and the arm head of the six-section boom (6); The arm retracting mechanism comprises an arm retracting pulley III (21) arranged at the end of the five-section arm (5), and an arm retracting cable III (14) which passes around the arm retracting pulley III (21) and connects the arm head of the four-section arm (4) and the arm end of the six-section arm (6).

2. The double-cylinder multi-section boom telescopic system according to claim 1, characterized in that: The cylinder rod of the telescopic cylinder I (7) is installed at the end of the first-section boom (1), and the cylinder barrel is installed at the end of the second-section boom (2); the cylinder rod of the telescopic cylinder II (8) is installed at the end of the second-section boom (2), and the cylinder barrel is installed at the end of the third-section boom (3).

3. The double-cylinder multi-section boom telescopic system according to claim 2, characterized in that: The boom extension mechanism further comprises a boom extension pulley I (15) arranged on the cylinder head of the telescopic oil cylinder II (8), and a boom extension cable I (9) which passes around the boom extension pulley I (15) and connects the tail of the second-section boom (2) and the tail of the fourth-section boom (4).

4. The double-cylinder multi-section boom telescopic system according to claim 2, characterized in that: The arm retracting mechanism further comprises an arm retracting pulley I (19) arranged at the end of the three-section arm (3), and an arm retracting cable I (12) which passes around the arm retracting pulley I (19) and connects the cylinder head of the telescopic cylinder I (7) and the arm head of the four-section arm (4).

5. The double-cylinder multi-section boom telescopic system according to claim 2, characterized in that: The arm retracting mechanism further comprises an arm retracting pulley II (20) arranged at the end of the four-section arm (4), and an arm retracting cable II (13) which passes around the arm retracting pulley II (20) and connects the cylinder head of the telescopic cylinder II (8) and the arm head of the five-section arm (5).

6. The double-cylinder multi-section boom telescopic system according to claim 1, characterized in that: The boom assembly comprises an N-section boom, which comprises a P-section boom (22), a P-1-section boom (23) and a P-2-section boom (24) which are slidably connected in sequence, wherein N and P are both integers greater than 6, and N≥P; the boom mechanism comprises an boom pulley P (25) arranged at the arm head of the P-1-section boom (23), a boom cable P (26) bypassing the boom pulley P (25) and connecting the arm tail of the P-2-section boom (24) and the arm tail of the P-section boom (22); the boom retracting mechanism comprises a boom retracting pulley P (27) arranged at the arm tail of the P-1-section boom (23), and a boom retracting cable P (28) bypassing the boom retracting pulley P (27) and connecting the arm head of the P-2-section boom (24) and the arm tail of the P-section boom (22).

7. A crane, characterized in that: A double-cylinder multi-section boom telescopic system according to any one of claims 1 to 6 is installed.

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