Boom, six-stage telescopic boom and crane

Abstract

To provide a six-stage telescopic boom and a crane that are able to realize selective extension / retraction of a telescopic boom and able to reduce the weight and cost of the entire boom while securing the lifting performance of the boom.SOLUTION: A boom includes a telescopic boom, a first retracting flexible rope 6, a first extending flexible rope 7, a hydraulic cylinder 8, and a locking mechanism 9. The hydraulic cylinder 8 is disposed in the telescopic boom, one end of the hydraulic cylinder is connected to a second-stage boom 2, and the other end of the hydraulic cylinder is connected to a third-stage boom 3. The locking mechanism 9 is disposed on a first-stage boom 1. In a locked state, the locking mechanism 9 locks the first retracting flexible rope 6 and / or the first extending flexible rope 7. The hydraulic cylinder 8 is suitable to drive the second-stage boom 2 and the third-stage boom 3 to extend and retract.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the field of crane technology, and more particularly to a boom, a six-section telescopic boom and a crane. [Background technology]

[0002] A crane is a device used to lift and transport heavy loads, and is also called a hoist or lifting device. The boom is the core component of a crane and plays an important role in lifting operations. The boom's weight, strength, rigidity, telescopic efficiency, operational stability, and reliability directly affect the crane's performance.

[0003] In the prior art, as shown in Figure 1, the boom includes a multi-stage telescopic boom, two hydraulic cylinders, and multiple telescopic ropes. One end of a first hydraulic cylinder 6' is connected to the first-stage boom 1' and the other end is connected to the second-stage boom 2'. A second hydraulic cylinder 7' is connected to the second-stage boom 2' and the other end is connected to the third-stage boom 3'. The second-stage boom 2' is driven by the first hydraulic cylinder 6' to telescope, and the third-stage boom 3', fourth-stage boom 4', and fifth-stage boom 5' are driven by the second hydraulic cylinder 7' to telescope simultaneously. This structure allows the boom to be quickly extended and retracted, allows the boom length to be flexibly changed, and is convenient to work with. However, the installation of two hydraulic cylinders inside the boom complicates the internal structure of the boom and increases the boom's own weight. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of this, the present invention provides a boom, a six-section telescopic boom, and a crane to solve the problem that the internal structure of the boom becomes complicated due to the installation of two hydraulic cylinders inside the boom. [Means for solving the problem]

[0005] In a first aspect, the present invention provides a boom, the boom comprising: A telescopic boom including at least a first stage boom, a second stage boom, and a third stage boom which are fitted together in sequence, wherein a first pulley is provided at an extension end of the second stage boom, and a second pulley is provided at a retraction end of the second stage boom; a first retractable flexible rope having one end connected to the third boom and wound around the first pulley; a first extension flexible rope, one end of which passes through a through hole on the second boom and is connected to the third boom, and which is wound around the second pulley, and the other end of which is connected to the other end of the first contraction flexible rope; a hydraulic cylinder provided within the telescopic boom, one end connected to the second boom stage and the other end connected to the third boom stage, used to drive the third boom stage and move it in a direction approaching or moving away from the second boom stage; a locking mechanism provided on the first boom stage and having a locked state, In the locked state, the locking mechanism locks the first retractable flexible rope and / or the first extendable flexible rope, and the hydraulic cylinder is suitable for driving the second stage boom and the third stage boom to extend and retract.

[0006] The beneficial effects are as follows: With this boom, when lifting is performed with the crane's medium-length boom, the locking mechanism is in a locked state, and the locking mechanism locks the first retractable flexible rope and / or the first extendable flexible rope, and drives the hydraulic cylinder to extend it, so that the third stage boom extends relative to the second stage boom, and as the third stage boom extends and moves, it pulls one end of the first extendable flexible rope, and because the other end of the first extendable flexible rope is locked by the locking mechanism, one end of the first extendable flexible rope further pulls and moves the second pulley in the process of following the extension movement of the third stage boom, so that the second stage boom extends relative to the first stage boom, and so the second stage boom and the third stage boom are simultaneously driven by the hydraulic cylinder to extend synchronously. Similarly, by driving the hydraulic cylinder to retract, the third stage boom retracts relative to the second stage boom, and as the third stage boom retracts and moves, it pulls one end of the first retractable flexible rope, and because the other end of the first retractable flexible rope is locked by the locking mechanism, the one end of the first retractable flexible rope further moves the first pulley in the process of following the retraction movement of the third stage boom, causing the second stage boom to retract relative to the first stage boom, and thereby achieving that the second stage boom and the third stage boom are driven simultaneously by the hydraulic cylinder and retracted synchronously.

[0007] Compared to conventional mechanisms, the embodiment of this application allows selective extension and retraction of the telescopic boom by installing only one hydraulic cylinder within the telescopic boom, and also provides redundancy of the hydraulic cylinder and rope rows in the medium-long boom state without changing the structural strength of the telescopic boom, thereby reducing the weight and cost of the entire boom while maintaining the lifting performance of the boom.

[0008] In one alternative embodiment, the locking mechanism further has an unlocked state, and in the unlocked state, the locking mechanism releases the first retracting flexible rope and / or the first extending flexible rope, the second stage boom is retracted into the first stage boom, and the hydraulic cylinder is suitable for driving the third stage boom to extend and retract.

[0009] The beneficial effects are as follows: when lifting with the short or medium boom of the crane, the locking mechanism is in an unlocked state, and the locking mechanism releases the first retractable flexible rope and / or the first extendable flexible rope and drives the hydraulic cylinder to extend it, thereby extending the third stage boom relative to the second stage boom, and as the third stage boom extends and moves, it pulls one end of the first extendable flexible rope to move, and because the first extendable flexible rope and the first retractable flexible rope are not locked by the locking mechanism, during the process of extending and moving the third stage boom, the first extendable flexible rope and the first retractable flexible rope rotate on the second pulley and the first pulley, causing the second stage boom to retract into the first stage boom, thereby realizing that the hydraulic cylinder drives and extends only the third stage boom. Similarly, by driving the hydraulic cylinder to retract, the third stage boom retracts relative to the second stage boom, and as the third stage boom extends and moves, it pulls one end of the first extension flexible rope and moves. Because the first extension flexible rope and the first retraction flexible rope are not locked by the locking mechanism, the first extension flexible rope and the first retraction flexible rope rotate on the second pulley and the first pulley as the third stage boom extends and moves, so that the second stage boom retracts into the first stage boom, thereby realizing that the hydraulic cylinder drives and retracts only the third stage boom.

[0010] In one alternative embodiment, in the locked state, the locking mechanism is locked to the connection between the first retractable flexible rope and the first extendable flexible rope.

[0011] The beneficial effects are as follows: in the locked state, the locking mechanism is locked at the connection between the first retractable flexible rope and the first extendable flexible rope, which is advantageous to ensure a strong lock on the first retractable flexible rope and the first extendable flexible rope, so that the hydraulic cylinder can drive the third stage boom to extend or retract, and stably move the second stage boom to extend or retract, improving the stability and operational safety of the entire boom.

[0012] In one alternative embodiment, the locking mechanism includes a drive member and a lock pin connected to the drive member, and in the locked state, the drive member drives the lock pin to insert it into the connection between the first retractable flexible rope and the first extendable flexible rope, and in the unlocked state, the drive member drives the lock pin to disengage it from the connection between the first retractable flexible rope and the first extendable flexible rope.

[0013] The beneficial effects are as follows: in the locked state, the driving member inserts the locking pin into the connection between the first retractable flexible rope and the first extendable flexible rope, ensuring that the locking mechanism firmly locks the first retractable flexible rope and the first extendable flexible rope, preventing the first retractable flexible rope and the first extendable flexible rope from loosening, and improving work stability and safety; in the unlocked state, the driving member disengages the locking pin from the connection between the first retractable flexible rope and the first extendable flexible rope, and the driving member controls the locking pin to switch the locking mechanism between the locked state and the unlocked state, allowing the user to easily switch the state of the locking mechanism and simplifying the operation process.

[0014] In one alternative embodiment, the device further includes a connecting member, wherein the first contracting flexible rope and the first extending flexible rope are connected via the connecting member, and the connecting member has a pin hole corresponding to the lock pin.

[0015] The beneficial effects are as follows: By providing a connection part to connect the first retractable flexible rope and the first extendable flexible rope, a strong connection between the first retractable flexible rope and the first extendable flexible rope is ensured, improving the stability and safety of the entire system. The connecting member has a pin hole corresponding to the locking pin, so that the locking pin can be easily inserted into the pin hole to lock the first retractable flexible rope and the first extendable flexible rope, or removed from the pin hole to easily release the first retractable flexible rope and the first extendable flexible rope. At the same time, when the locking pin is inserted into and removed from the pin hole, friction and wear between the locking pin and the first retractable flexible rope and the first extendable flexible rope during movement are reduced, thereby extending the service life of the first retractable flexible rope and the first extendable flexible rope.

[0016] In one alternative embodiment, when the second boom stage is retracted within the first boom stage, the lock pin is aligned with the pin hole, and the drive member is suitable for driving the lock pin to insert into or remove from the pin hole.

[0017] The beneficial effects are as follows: When the second boom stage is retracted into the first boom stage, the lock pin is provided aligned with the pin hole, which makes it easier for the user to control the lock pin to be inserted accurately into the pin hole, and also makes it easier for the user to control the lock mechanism to switch between a locked state and an unlocked state.

[0018] In one alternative embodiment, the device further includes a controller, the controller being electrically connected to the hydraulic cylinder and the locking mechanism, respectively, and the controller being used to control the extension and retraction of the hydraulic cylinder and to control the locking mechanism to switch between the locked state and the unlocked state.

[0019] The beneficial effects are as follows: The controller controls the extension and retraction of the hydraulic cylinder and the switching of the state of the locking mechanism, thereby realizing automatic control and improving the convenience and flexibility of operation.

[0020] In a second aspect, the present invention further provides a six-section telescopic boom, the six-section telescopic boom comprising: a boom in which a fourth stage boom, a fifth stage boom, and a sixth stage boom are sequentially inserted into the third stage boom; a third pulley provided on an end surface of the hydraulic cylinder away from the second stage boom; a second extension flexible rope, one end of which is connected to the second boom stage, wound around the third pulley, and the other end of which is connected to the fourth boom stage; a first pulley group including a fourth pulley and a fifth pulley provided opposite to each other, the fourth pulley being provided at an extension end of the fourth boom stage, and the fifth pulley being provided at a retraction end of the fifth boom stage; a third elongated flexible rope having one end passing through the third boom and the fourth boom and connected to the second boom, and the other end connected to the fourth boom, and sequentially surrounding the fourth pulley and the fifth pulley; a second pulley group including a sixth pulley and a seventh pulley provided opposite to each other, the sixth pulley being provided at the extension end of the fifth boom stage, and the seventh pulley being provided at the retraction end of the sixth boom stage; and a fourth elongated flexible rope having one end passing through the fourth boom section and connected to the third boom section, and the other end connected to the fifth boom section, and surrounding the sixth pulley and the seventh pulley in sequence.

[0021] The beneficial effects are as follows: In this six-section telescopic boom, by driving and extending the hydraulic cylinder, the third section of the boom is extended relative to the second section of the boom, and as the hydraulic cylinder extends, it moves and displaces the third pulley at the end thereof, and a second extension flexible rope is wound around the third pulley, one end of which is connected to the second section of the boom and the other end to the fourth section of the boom, and the second extension flexible rope is used to pull and synchronously extend the fourth section of the boom. The fourth and fifth section booms are provided with a first pulley group, and both ends of the third extension flexible rope are provided on the fourth and second section booms, respectively, and the third section extension flexible rope is wound around the first pulley group, so that when the fourth section of the boom moves and extends the third section of the boom, the third extension flexible rope pulls and displaces the fifth pulley, and the fifth pulley further moves and extends the fifth section of the boom. Similarly, when the fifth stage boom moves and extends the fourth extension flexible rope, the fourth extension flexible rope pulls and moves the seventh pulley, and the seventh pulley further moves and extends the sixth stage boom. As described above, by driving and extending the hydraulic cylinders, the third stage boom, fourth stage boom, fifth stage boom and sixth stage boom can be extended synchronously.

[0022] In one alternative embodiment, the eighth pulley is provided at the retracted end of the third boom stage, a second retractable flexible rope is wound around the eighth pulley while one end is connected to the second boom stage and the other end is connected to the fourth boom stage; the third pulley group includes a ninth pulley and a tenth pulley provided opposite to each other, the ninth pulley being provided at a retracted end of the fourth boom stage, and the tenth pulley being provided at an end of the hydraulic cylinder remote from the second boom stage; A third retractable flexible rope has one end connected to the fourth boom and the other end connected to the sixth boom, and wraps around the tenth pulley and the ninth pulley in sequence.

[0023] The beneficial effects are as follows: By driving the hydraulic cylinder to retract, the third boom retracts relative to the second boom, and as the third boom retracts and moves, it moves the eighth pulley. A second retracting flexible rope is wound around the eighth pulley, and both ends of the second retracting flexible rope are connected to the second and fourth booms, respectively. As the eighth pulley moves, it pulls the second retracting flexible rope, which then pulls the fourth boom, retracting it in sync with the third boom. As the fourth boom retracts, the fourth retracting flexible rope pulls the fifth boom, retracting it in sync with the fourth boom. The third retracting flexible rope is connected to the fourth and sixth booms via the third pulley group, and as the fourth boom retracts and moves, the third retracting flexible rope pulls the sixth boom, retracting it in sync with the fourth boom. As described above, by driving the hydraulic cylinder to retract the booms, the third stage boom, the fourth stage boom, the fifth stage boom and the sixth stage boom can be retracted in synchronization.

[0024] In one alternative embodiment, the first pulley group, the second pulley group, the third pulley group, and the eighth pulley are all provided within the telescopic boom.

[0025] The beneficial effects are as follows: By installing the first, second, third and eighth sheave groups inside the telescopic boom, space can be effectively saved, the whole system can be designed more compactly, and the sheaves can be effectively protected from the influence of the external environment.

[0026] In a third aspect, the present invention further provides a crane, said crane comprising: The car body and The boom includes a six-section telescopic boom mounted on the vehicle body.

[0027] The beneficial effects are as follows: This crane can realize selective extension and retraction of the telescopic boom by providing only one hydraulic cylinder in the telescopic boom, reducing the weight and cost of the entire boom while ensuring the lifting performance of the boom. [Brief explanation of the drawings]

[0028] In order to more clearly describe the specific embodiments of the present invention or the technical solutions of the prior art, the following will briefly describe the drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present invention, and those skilled in the art can further derive other drawings based on these drawings without any creative efforts.

[0029] [Figure 1] 1 is a schematic diagram of the principle of a boom in the prior art; [Figure 2] 1 is a schematic diagram of the principle of a boom according to an embodiment of the present invention; [Figure 3] 1 is a schematic diagram illustrating the principle of contracting a telescopic boom in a locked state according to an embodiment of the present invention. FIG. [Figure 4] 1 is a schematic diagram illustrating the principle of extension of a telescopic boom in a locked state of the boom according to an embodiment of the present invention. FIG. [Figure 5] FIG. 1 is a schematic diagram illustrating the principle of retracting a telescopic boom when the boom is in an unlocked state according to an embodiment of the present invention. [Figure 6] FIG. 1 is a schematic diagram illustrating the extension principle of a telescopic boom in an unlocked state of the boom according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and comprehensively below with reference to the drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, other embodiments that can be obtained by those skilled in the art without any creative efforts are all within the protection scope of the present invention.

[0031] In the related art, as shown in Figure 1, the boom includes a multi-stage telescopic boom, two hydraulic cylinders, and multiple telescopic ropes. One end of a first hydraulic cylinder 6' is connected to the first-stage boom 1' and the other end is connected to the second-stage boom 2'. A second hydraulic cylinder 7' is connected to the second-stage boom 2' and the other end is connected to the third-stage boom 3'. The second-stage boom 2' is driven by the first hydraulic cylinder 6' to telescope, and the third-stage boom 3', fourth-stage boom 4', and fifth-stage boom 5' are driven by the second hydraulic cylinder 7' to telescope simultaneously. This structure allows the boom to be quickly extended and retracted, allows the boom length to be flexibly changed, and is convenient to work with. However, the installation of two hydraulic cylinders inside the boom complicates the internal structure of the boom and increases the boom's own weight.

[0032] In order to solve the above technical problems, an embodiment of the present invention will be described below with reference to FIGS.

[0033] According to an embodiment of the present invention, in one aspect, there is provided a boom including a telescopic boom, a first retractable flexible rope 6, a first extendable flexible rope 7, a hydraulic cylinder 8, and a locking mechanism 9, as shown in Figures 2 to 6.

[0034] Specifically, as shown in FIG. 2, the telescopic boom includes at least a first stage boom 1, a second stage boom 2, and a third stage boom 3, which are sequentially fitted together, with a first pulley 4 provided at the extended end of the second stage boom 2 and a second pulley 5 provided at the retracted end of the second stage boom 2.

[0035] Specifically, as shown in FIG. 2, one end of the first retractable flexible rope 6 is connected to the third boom 3 , and the first retractable flexible rope 6 is wound around the first pulley 4 .

[0036] Specifically, as shown in Figure 2, one end of the first extension flexible rope 7 passes through a through hole on the second stage boom 2 and is connected to the third stage boom 3, the first extension flexible rope 7 is wound around the second pulley 5, and the other end of the first extension flexible rope 7 is connected to the other end of the first retractable flexible rope 6.

[0037] Specifically, as shown in FIG. 2, the hydraulic cylinder 8 is provided inside the telescopic boom, one end of the hydraulic cylinder 8 is connected to the second stage boom 2, and the other end is connected to the third stage boom 3, and the hydraulic cylinder 8 is used to drive the third stage boom 3 and move it toward or away from the second stage boom 2.

[0038] Specifically, the locking mechanism 9 is provided on the first stage boom 1 and is in a locked state.

[0039] In the locked state, as shown in Figures 3 and 4, the locking mechanism 9 locks the first retractable flexible rope 6 and / or the first extendable flexible rope 7, and the hydraulic cylinder 8 is suitable for driving the second stage boom 2 and the third stage boom 3 to extend and retract.

[0040] With this boom, when lifting is performed with the crane's medium-length boom, the locking mechanism 9 is in a locked state, and the locking mechanism 9 locks the first retractable flexible rope 6 and / or the first extendable flexible rope 7, and drives the hydraulic cylinder 8 to extend it, so that the third stage boom 3 extends relative to the second stage boom 2. As the third stage boom 3 extends and moves, it pulls one end of the first extendable flexible rope 7, and because the other end of the first extendable flexible rope 7 is locked by the locking mechanism 9, one end of the first extendable flexible rope 7 further pulls and moves the second pulley 5 in the process of following the extension movement of the third stage boom 3, so that the second stage boom 2 extends relative to the first stage boom 1, and so the second stage boom 2 and the third stage boom 3 are simultaneously driven by the hydraulic cylinder 8 and extend synchronously. Similarly, by driving and retracting the hydraulic cylinder 8, the third stage boom 3 retracts relative to the second stage boom 2, and as the third stage boom 3 retracts and moves, it pulls one end of the first retractable flexible rope 6, and because the other end of the first retractable flexible rope 6 is locked by the locking mechanism 9, one end of the first retractable flexible rope 6 further moves and moves the first pulley 4 in the process of following the retraction movement of the third stage boom 3, so that the second stage boom 2 retracts relative to the first stage boom 1, and as a result, the second stage boom 2 and the third stage boom 3 are driven simultaneously by the hydraulic cylinder 8 and retracted synchronously.

[0041] Compared to conventional mechanisms, the embodiment of the present application allows selective extension and retraction of the telescopic boom by providing only one hydraulic cylinder 8 within the telescopic boom. Furthermore, the structural strength of the telescopic boom remains unchanged, and the redundancy of the hydraulic cylinder 8 and rope rows is utilized in the medium-to-long boom state, ensuring the lifting performance of the boom while reducing the weight and cost of the entire boom.

[0042] In one embodiment, as shown in Figures 5 and 6, the locking mechanism 9 further has an unlocked state, in which the locking mechanism 9 releases the first retractable flexible rope 6 and / or the first extendable flexible rope 7, the second stage boom 2 is retracted into the first stage boom 1, and the hydraulic cylinder 8 is suitable for driving the third stage boom 3 to extend and retract.

[0043] When lifting with the short or medium boom of the crane, the locking mechanism 9 is in an unlocked state, and the locking mechanism 9 releases the first retractable flexible rope 6 and / or the first extendable flexible rope 7 and drives the hydraulic cylinder 8 to extend them, thereby causing the third stage boom 3 to extend relative to the second stage boom 2. As the third stage boom 3 extends and moves, it pulls one end of the first extendable flexible rope 7 to move. Because the first extendable flexible rope 7 and the first retractable flexible rope 6 are not locked by the locking mechanism 9, during the process of the third stage boom 3 extending and moving, the first extendable flexible rope 7 and the first retractable flexible rope 6 rotate on the second pulley 5 and the first pulley 4, thereby causing the second stage boom 2 to retract into the first stage boom 1, and the hydraulic cylinder 8 thereby drives only the third stage boom 3 to extend. Similarly, by driving and retracting the hydraulic cylinder 8, the third stage boom 3 retracts relative to the second stage boom 2, and the third stage boom 3 moves by pulling one end of the first extension flexible rope 7 as it extends and moves. Since the first extension flexible rope 7 and the first retraction flexible rope 6 are not locked by the locking mechanism 9, during the process of the third stage boom 3 extending and moving, the first extension flexible rope 7 and the first retraction flexible rope 6 rotate on the second pulley 5 and the first pulley 4, thereby causing the second stage boom 2 to retract within the first stage boom 1, and thereby allowing the hydraulic cylinder 8 to drive only the third stage boom 3 to retract.

[0044] It should be explained that with regard to the "extension end" and "retraction end" mentioned above, each boom stage has an extension end and a retraction end, and taking the second boom stage 2 as an example, when the second boom stage 2 is extended from the first boom stage 1, the end of the second boom stage 2 that is away from the first boom stage 1 is the extension end, and the end opposite the extension end is the retraction end.

[0045] Specifically, the first contractible flexible rope 6 and the first extendable flexible rope 7 can be made of wire rope or synthetic fiber rope, and in the embodiments of the present application, the types of the first contractible flexible rope 6 and the first extendable flexible rope 7 are not specifically limited.

[0046] Specifically, one end of the first retractable flexible rope 6 is connected to the third stage boom 3, and one end of the first retractable flexible rope 6 may be connected to the retracted end of the third stage boom 3 or may be connected to another position on the third stage boom 3, and in the embodiments of the present application, the connection position between the first retractable flexible rope 6 and the third stage boom 3 is not specifically limited.

[0047] Similarly, one end of the first extension flexible rope 7 is connected to the third stage boom 3, and one end of the first extension flexible rope 7 may be connected to the retracted end of the third stage boom 3 or may be connected to another position on the third stage boom 3, and in the embodiments of the present application, the connection position between the first extension flexible rope 7 and the third stage boom 3 is not specifically limited.

[0048] Specifically, the locking mechanism 9 can lock the first retractable flexible rope 6 or the first extendable flexible rope 7, or the locking mechanism 9 can simultaneously lock the connection between the first retractable flexible rope 6 and the first extendable flexible rope 7.

[0049] Specifically, the locking mechanism 9 can be any conventional locking mechanism selected according to needs, such as a hydraulic locking mechanism, an electromagnetic locking mechanism, or a friction locking mechanism. In the embodiments of the present application, the structure of the locking mechanism 9 is not specifically limited.

[0050] It should be noted that a fourth stage boom 11, a fifth stage boom 12, a sixth stage boom 13, etc. may be sequentially fitted into the third stage boom 3, and the number of telescopic booms is not specifically limited in the embodiments of the present application.

[0051] Specifically, as shown in FIG. 2, the hydraulic cylinder 8 is provided with an oil supply pipe 24, which passes through the first stage boom 1 and can communicate with the outside.

[0052] In one embodiment, as shown in Figures 3 and 4, the locking mechanism 9 is locked to the connection between the first retracting flexible rope 6 and the first extending flexible rope 7 in the locked state.

[0053] In the locked state, the locking mechanism 9 is locked to the connection between the first retractable flexible rope 6 and the first extendable flexible rope 7, which is advantageous in ensuring a strong lock on the first retractable flexible rope 6 and the first extendable flexible rope 7, allowing the hydraulic cylinder 8 to drive the third stage boom 3 to extend or retract, and stably move the second stage boom 2 to extend or retract, thereby improving the stability of the entire boom and the safety of operation.

[0054] Specifically, in order to make it easier for the locking mechanism 9 to lock or release the connection, a structure such as a locking hole or locking member may be provided at the connection between the first contracting flexible rope 6 and the first extending flexible rope 7, and in the embodiments of the present application, the connection between the first contracting flexible rope 6 and the first extending flexible rope 7 is not specifically limited.

[0055] In one embodiment, the locking mechanism 9 includes a drive member and a locking pin (not shown) connected to the drive member, and in a locked state (shown in Figures 3 and 4), the drive member drives the locking pin to insert it into the connection between the first retractable flexible rope 6 and the first extendable flexible rope 7, and in an unlocked state (shown in Figures 5 and 6), the drive member drives the locking pin to disengage it from the connection between the first retractable flexible rope 6 and the first extendable flexible rope 7.

[0056] In the locked state, the driving member inserts the locking pin into the connection between the first retractable flexible rope 6 and the first extendable flexible rope 7, ensuring that the locking mechanism 9 firmly locks the first retractable flexible rope 6 and the first extendable flexible rope 7, preventing the first retractable flexible rope 6 and the first extendable flexible rope 7 from loosening and improving work stability and safety. In the unlocked state, the driving member disengages the locking pin from the connection between the first retractable flexible rope 6 and the first extendable flexible rope 7, and the driving member controls the locking pin to switch the locking mechanism 9 between the locked state and the unlocked state, allowing the user to easily switch the state of the locking mechanism 9 and simplifying the operation process.

[0057] Specifically, to make it easier to insert the locking pin, a locking hole may be provided at the connection between the first contracting flexible rope 6 and the first extending flexible rope 7, and the locking pin may be formed when the first contracting flexible rope 6 and the first extending flexible rope 7 are connected, or may be provided on another component, which is provided at the connection between the first contracting flexible rope 6 and the first extending flexible rope 7.

[0058] Specifically, the driving member may be a conventional driving member such as a motor, a hydraulic cylinder, or a pneumatic cylinder, depending on the needs, and the type of the driving member is not specifically limited in the embodiments of the present application.

[0059] In one embodiment, the device further includes a connecting member 10 (not shown), and the first contractible flexible rope 6 and the first extendable flexible rope 7 are connected via the connecting member 10, and the connecting member 10 has a pin hole formed therein, which corresponds to the lock pin.

[0060] The provision of the connecting member 10 to connect the first retractable flexible rope 6 and the first extendable flexible rope 7 ensures a strong connection between the first retractable flexible rope 6 and the first extendable flexible rope 7, improving the stability and safety of the entire system. The connecting member 10 has a pin hole corresponding to the locking pin so that the locking pin can be inserted into the pin hole to easily lock the first retractable flexible rope 6 and the first extendable flexible rope 7, or the locking pin can be removed from the pin hole to easily release the first retractable flexible rope 6 and the first extendable flexible rope 7. At the same time, when the locking pin is inserted into and removed from the pin hole, friction and wear between the locking pin and the first retractable flexible rope 6 and the first extendable flexible rope 7 during movement can be reduced, and the service life of the first retractable flexible rope 6 and the first extendable flexible rope 7 can be extended.

[0061] In one embodiment, as shown in Figures 3 and 5, when the second stage boom 2 is retracted within the first stage boom 1, the lock pin is aligned with the pin hole, and the drive member is suitable for driving the lock pin to insert into or remove from the pin hole.

[0062] When the second stage boom 2 is retracted within the first stage boom 1, the lock pin is aligned with the pin hole, making it easier for the user to control the lock pin so that it is inserted accurately into the pin hole, and also making it easier for the user to control the lock mechanism 9 to switch between the locked state and the unlocked state.

[0063] Specifically, the shape of the pin hole may be set according to the cross section of the lock pin; for example, the pin hole may be provided to be a circular hole, an elliptical hole, etc., and in the examples of the present application, the shape of the pin hole is not particularly limited.

[0064] In one embodiment, the device further includes a controller (not shown), which is electrically connected to the hydraulic cylinder 8 and the locking mechanism 9, and is used to control the extension and retraction of the hydraulic cylinder 8 and to control the locking mechanism 9 to switch between a locked state and an unlocked state.

[0065] The controller controls the extension and contraction of the hydraulic cylinder 8 and the switching of the state of the locking mechanism 9, thereby realizing automatic control and improving the convenience and flexibility of operation.

[0066] Specifically, the controller may be a conventional controller such as a PLC (Programmable Logic Controller), a microcontroller or a computer control system, and in the embodiments of the present application, the type of the controller is not specifically limited.

[0067] According to an embodiment of the present invention, in another aspect, as shown in Figures 2 to 6, there is further provided a six-section telescopic boom including a boom, a third pulley 14, a second extension flexible rope 15, a first pulley group 16, a third extension flexible rope 17, a second pulley group 18, and a fourth extension flexible rope 19.

[0068] Specifically, as shown in FIG. 2, a fourth stage boom 11, a fifth stage boom 12, and a sixth stage boom 13 are fitted into the third stage boom 3 in this order.

[0069] Specifically, as shown in FIG. 2, the third pulley 14 is provided on the end face of the hydraulic cylinder 8 that is remote from the boom 2 of the second stage.

[0070] Specifically, as shown in Figure 2, one end of the second extension flexible rope 15 is connected to the second stage boom 2, the second extension flexible rope 15 is wound around the third pulley 14, and the other end of the second extension flexible rope 15 is connected to the fourth stage boom 11.

[0071] Specifically, as shown in FIG. 2, the first pulley group 16 includes a fourth pulley 1601 and a fifth pulley 1602, which are arranged opposite each other, with the fourth pulley 1601 being arranged at the extended end of the fourth boom 11 and the fifth pulley 1602 being arranged at the retracted end of the fifth boom 12.

[0072] Specifically, as shown in Figure 2, one end of the third extension flexible rope 17 passes through the third stage boom 3 and the fourth stage boom 11 and is connected to the second stage boom 2, and the other end of the third extension flexible rope 17 is connected to the fourth stage boom 11, and the third extension flexible rope 17 sequentially wraps around the fourth pulley 1601 and the fifth pulley 1602.

[0073] Specifically, as shown in FIG. 2, the second pulley group 18 includes a sixth pulley 1801 and a seventh pulley 1802, which are arranged opposite each other, with the sixth pulley 1801 being arranged at the extended end of the fifth boom 12 and the seventh pulley 1802 being arranged at the retracted end of the sixth boom 13.

[0074] Specifically, as shown in Figure 2, one end of the fourth extension flexible rope 19 passes through the fourth boom 11 and is connected to the third boom 3, and the other end of the fourth extension flexible rope 19 is connected to the fifth boom 12 while sequentially surrounding the sixth pulley 1801 and the seventh pulley 1802.

[0075] In this six-section telescopic boom, the third section boom 3 is extended relative to the second section boom 2 by driving and extending the hydraulic cylinder 8, and as the hydraulic cylinder 8 extends, it moves the third pulley 14 on its end face, and a second extension flexible rope 15 is wound around the third pulley 14, one end of which is connected to the second section boom 2 and the other end of which is connected to the fourth section boom 11, and the second extension flexible rope 15 pulls the fourth section boom 11, extending it in synchronous with the boom. The first pulley group 16 is provided on the fourth stage boom 11 and the fifth stage boom 12, both ends of the third extension flexible rope 17 are provided on the fourth stage boom 11 and the second stage boom 2, respectively, and the third extension flexible rope 17 is wound around the first pulley group 16, so that when the fourth stage boom 11 moves and extends the third stage boom 3, the third extension flexible rope 17 pulls and moves the fifth pulley 1602, and the fifth pulley 1602 further moves and extends the fifth stage boom 12. Similarly, when the fifth stage boom 12 moves and extends the fourth extension flexible rope 19, the fourth extension flexible rope 19 pulls and moves the seventh pulley 1802, and the seventh pulley 1802 further moves and extends the sixth stage boom 13. As described above, by driving and extending the hydraulic cylinder 8, the third boom 3, the fourth boom 11, the fifth boom 12 and the sixth boom 13 can be extended synchronously.

[0076] It should be explained that the structure formed by the first pulley group 16 and the third extension flexible rope 17 has a ratio of the moving distance of the free end to the moving distance of the moving end of 2:3, and the fourth boom 11 can be understood as the free end, and the fifth pulley 1602 and the fifth boom 12 can be understood as the moving end as a whole, so that when the fourth boom 11 moves 2h relative to the second boom 2, the fifth boom 12 moves 3h relative to the second boom 2. Similarly, the structure formed by the second pulley group 18 and the fourth extension flexible rope 19 is based on the same principle as the above structure, and the fifth boom 12 can be understood as the free end, and the seventh pulley 1802 and the sixth boom 13 can be understood as the moving end as a whole, so that when the fifth boom 12 moves 2h relative to the third boom 3, the sixth boom 13 moves 3h relative to the third boom 3.

[0077] Specifically, the second elongated flexible rope 15, the third elongated flexible rope 17, and the fourth elongated flexible rope 19 can be made of wire rope, or can be made of conventional flexible rope such as synthetic fiber rope. In the embodiments of the present application, the types of the second elongated flexible rope 15, the third elongated flexible rope 17, and the fourth elongated flexible rope 19 are not specifically limited.

[0078] In one embodiment, as shown in FIG. 2, the apparatus further includes an eighth pulley 20, a second retractable flexible rope 21, a third pulley group 22, and a third retractable flexible rope 23.

[0079] Specifically, as shown in FIG. 2, the eighth pulley 20 is provided at the retracted end of the boom 3 in the third stage.

[0080] Specifically, as shown in Figure 2, the second retractable flexible rope 21 is wound around the eighth pulley 20, with one end connected to the second boom 2 and the other end connected to the fourth boom 11.

[0081] Specifically, as shown in FIG. 2, the third pulley group 22 includes a ninth pulley 2201 and a tenth pulley 2202 arranged opposite each other, with the ninth pulley 2201 being arranged at the retracted end of the fourth stage boom 11 and the tenth pulley 2202 being arranged at the end face of the hydraulic cylinder 8 away from the second stage boom 2.

[0082] Specifically, as shown in Figure 2, the third contractible flexible rope 23 has one end connected to the fourth boom 11 and the other end connected to the sixth boom 13, and surrounds the tenth pulley 2202 and the ninth pulley 2201 in sequence.

[0083] By driving and retracting the hydraulic cylinder 8, the third stage boom 3 retracts relative to the second stage boom 2, and as the third stage boom 3 retracts and moves, it moves the eighth pulley 20, and a second retractable flexible rope 21 is wound around the eighth pulley 20, and both ends of the second retractable flexible rope 21 are connected to the second stage boom 2 and the fourth stage boom 11, respectively. Therefore, as the eighth pulley 20 moves, it pulls and moves the second retractable flexible rope 21, and the second retractable flexible rope 21 pulls the fourth stage boom 11, causing it to retract in sync with the third stage boom 3. During the process of retracting the fourth stage boom 11, the fourth extension flexible rope 19 pulls the fifth stage boom 12, causing it to retract in sync with the fourth stage boom 11. The third retractable flexible rope 23 is connected to the fourth stage boom 11 and the sixth stage boom 13 via the third pulley group 22, and when the fourth stage boom 11 is retracted and moving, the third retractable flexible rope 23 pulls the sixth stage boom 13 to retract it in sync. As described above, by driving the hydraulic cylinder 8 to retract it, the third stage boom 3, the fourth stage boom 11, the fifth stage boom 12 and the sixth stage boom 13 can be retracted in sync.

[0084] In one embodiment, as shown in FIG. 2, the first sheave group 16, the second sheave group 18, the third sheave group 22, and the eighth sheave 20 are all provided within a telescoping boom.

[0085] By mounting the first pulley group 16, the second pulley group 18, the third pulley group 22 and the eighth pulley 20 all within the telescopic boom, space can be effectively saved, the entire system can be designed more compactly and the pulleys can be effectively protected from the influence of the external environment.

[0086] In this embodiment, the operating principle of the six-section telescopic boom is explained as follows.

[0087] (1) When the locking mechanism 9 is in the locked state, the crane performs lifting using the medium-length boom. The user controls the driving member to drive the lock pin and insert it into the pin hole of the connecting member 10, thereby locking the first retractable flexible rope 6 and the first extendable flexible rope 7, and at this time controls the hydraulic cylinder 8 to extend it, thereby enabling the second boom 2, the third boom 3, the fourth boom 11, the fifth boom 12, and the sixth boom 13 to extend synchronously. Controlling the hydraulic cylinder 8 to retract it enables the second boom 2, the third boom 3, the fourth boom 11, the fifth boom 12, and the sixth boom 13 to retract synchronously (see the above description for detailed processes of the synchronous extension and retraction of the second boom 3, the third boom 3, the fourth boom 11, the fifth boom 12, and the sixth boom 13).

[0088] (2) When the locking mechanism 9 is in the unlocked state, the crane performs lifting using the short or medium boom. The user controls the driving member to drive the lock pin to disengage it from the pin hole of the connecting member 10, thereby releasing the first retractable flexible rope 6 and the first extendable flexible rope 7. At this time, the user controls the hydraulic cylinder 8 to extend it, thereby enabling the third stage boom 3, the fourth stage boom 11, the fifth stage boom 12, and the sixth stage boom 13 to extend synchronously. By controlling the hydraulic cylinder 8 to retract, the third stage boom 3, the fourth stage boom 11, the fifth stage boom 12, and the sixth stage boom 13 to retract synchronously (see the above description for detailed processes of the synchronous extension and retraction of the third stage boom 3, the fourth stage boom 11, the fifth stage boom 12, and the sixth stage boom 13).

[0089] According to another aspect of the present invention, there is further provided a crane including a vehicle body and a boom or a six-section telescopic boom.

[0090] Specifically, the telescopic boom is provided on the vehicle body.

[0091] This crane can realize selective extension and retraction of the telescopic boom by providing only one hydraulic cylinder 8 in the telescopic boom, thereby reducing the weight and cost of the entire boom while ensuring the lifting performance of the boom.

[0092] Specifically, the crane may be a telescopic boom truck crane, a telescopic boom tower crane, etc., and the type of the crane is not specifically limited in the embodiments of the present application.

[0093] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations are included within the scope defined by the appended claims. [Explanation of symbols]

[0094] Explanation of symbols in the prior art 1' 1st stage boom, 2' 2nd stage boom, 3' 3rd stage boom, 4' 4th stage boom, 5' 5th stage boom, 6' 1st hydraulic cylinder, 7' 2nd hydraulic cylinder. Explanation of symbols 11th stage boom, 22nd stage boom, 33rd stage boom, 4. first pulley, 5. second pulley, 6. first retractable flexible rope, 7. first extendable flexible rope, 8. hydraulic cylinder, 9. locking mechanism, 10. connecting member, 114th stage boom, 125th stage boom, 136th stage boom, 14. third pulley, 15. second extendable flexible rope, 16. first pulley group, 1601. fourth pulley, 1602. fifth pulley, 17. third extendable flexible rope, 18. second pulley group, 1801. sixth pulley, 1802. seventh pulley, 19. fourth extendable flexible rope, 20. eighth pulley, 21. second retractable flexible rope, 22. third pulley group, 2201. ninth pulley, 2202. tenth pulley, 23. third retractable flexible rope, 24. fuel supply pipe.

Claims

1. It's a boom, A telescopic boom including at least a first stage boom (1), a second stage boom (2), and a third stage boom (3) which are fitted together in sequence, wherein a first pulley (4) is provided at the extended end of the second stage boom (2), and a second pulley (5) is provided at the retracted end of the second stage boom (2); a first retractable flexible rope (6) whose one end is connected to the third boom (3) and wound around the first pulley (4); a first extension flexible rope (7) having one end passing through a through hole on the second boom (2) and connected to the third boom (3), wound around the second pulley (5), and the other end connected to the other end of the first contraction flexible rope (6); a hydraulic cylinder (8) provided in the telescopic boom, one end of which is connected to the second boom stage (2) and the other end of which is connected to the third boom stage (3), and which is used to drive the third boom stage (3) and move it in a direction approaching or moving away from the second boom stage (2); a locking mechanism (9) provided on the first boom (1) and having a locked state; In the locked state, the locking mechanism (9) locks the first contraction flexible rope (6) and / or the first extension flexible rope (7), and the hydraulic cylinder (8) is suitable for driving the second stage boom (2) and the third stage boom (3) to extend and retract.

2. 2. The boom according to claim 1, wherein the locking mechanism (9) further has an unlocked state, and in the unlocked state, the locking mechanism (9) releases the first retracting flexible rope (6) and / or the first extending flexible rope (7), the second boom stage (2) is retracted into the first boom stage (1), and the hydraulic cylinder (8) is suitable for driving the third boom stage (3) to extend or contract.

3. 3. The boom according to claim 2, characterized in that, in the locked state, the locking mechanism (9) is locked to the connection between the first retracting flexible rope (6) and the first extending flexible rope (7).

4. 4. The boom according to claim 3, wherein the locking mechanism (9) includes a drive member and a lock pin connected to the drive member, and in the locked state, the drive member drives the lock pin to insert it into the connection portion between the first retractable flexible rope (6) and the first extension flexible rope (7), and in the unlocked state, the drive member drives the lock pin to remove it from the connection portion between the first retractable flexible rope (6) and the first extension flexible rope (7).

5. The boom according to claim 4, further comprising a connecting member (10), wherein the first contracting flexible rope (6) and the first extending flexible rope (7) are connected via the connecting member (10), and the connecting member (10) has a pin hole corresponding to the lock pin.

6. The boom according to claim 5, characterized in that, when the second boom stage (2) is retracted within the first boom stage (1), the lock pin is aligned with the pin hole, and the drive member is suitable for driving the lock pin to insert into or remove from the pin hole.

7. 2. The boom according to claim 1, further comprising a controller electrically connected to the hydraulic cylinder (8) and the locking mechanism (9), the controller being used to control the extension and contraction of the hydraulic cylinder (8) and to control the locking mechanism (9) to switch between the locked state and the unlocked state.

8. A six-section telescopic boom, The boom according to any one of claims 1 to 7, wherein a fourth stage boom (11), a fifth stage boom (12), and a sixth stage boom (13) are sequentially fitted into the third stage boom (3); a third pulley (14) provided on an end face of the hydraulic cylinder (8) away from the second stage boom (2); a second extension flexible rope (15) having one end connected to the second boom stage (2), wound around the third pulley (14), and the other end connected to the fourth boom stage (11); a first pulley group (16) including a fourth pulley (1601) and a fifth pulley (1602) provided opposite to each other, the fourth pulley (1601) being provided at the extension end of the fourth boom stage (11), and the fifth pulley (1602) being provided at the retraction end of the fifth boom stage (12); a third elongated flexible rope (17) having one end passing through the third boom (3) and the fourth boom (11) and connected to the second boom (2), and the other end connected to the fourth boom (11), and surrounding the fourth pulley (1601) and the fifth pulley (1602) in sequence; a second pulley group (18) including a sixth pulley (1801) and a seventh pulley (1802) provided opposite to each other, the sixth pulley (1801) being provided at the extension end of the fifth boom stage (12), and the seventh pulley (1802) being provided at the retraction end of the sixth boom stage (13); a fourth extension flexible rope (19) having one end passing through the fourth boom (11) and connected to the third boom (3), and the other end connected to the fifth boom (12), and surrounding the sixth pulley (1801) and the seventh pulley (1802) in sequence.

9. an eighth pulley (20) provided at the retracted end of the third boom (3); a second contractible flexible rope (21) having one end connected to the second boom (2) and the other end connected to the fourth boom (11), and wound around the eighth pulley (20); a third pulley group (22) including a ninth pulley (2201) and a tenth pulley (2202) provided opposite to each other, the ninth pulley (2201) being provided at the retracted end of the fourth boom stage (11), and the tenth pulley (2202) being provided at an end of the hydraulic cylinder (8) away from the second boom stage (2); The six-section telescopic boom according to claim 8, further comprising a third retractable flexible rope (23) having one end connected to the fourth boom section (11) and the other end connected to the sixth boom section (13), and surrounding the tenth pulley (2202) and the ninth pulley (2201) in sequence.

10. The six-section telescopic boom according to claim 9, wherein the first pulley group (16), the second pulley group (18), the third pulley group (22), and the eighth pulley (20) are all provided within the telescopic boom.

11. A crane, The car body and A crane comprising the boom according to any one of claims 1 to 7.

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