Auxiliary hook falling mechanism of crane hook and crane

Abstract

The utility model provides an auxiliary hook falling mechanism for a crane hook, which comprises a lifting mechanism, a hook, an auxiliary lifting mechanism and a lifting rope, the first end of the lifting rope is connected with the lifting mechanism, and the second end of the lifting rope is connected with the hook; the auxiliary lifting mechanism is connected with the lifting rope and is used for driving the lifting rope to move towards one end close to the lifting hook; the auxiliary lifting mechanism has a first state and a second state; when the auxiliary lifting mechanism is in the first state, the auxiliary lifting mechanism is in transmission connection with the lifting rope; and when the auxiliary lifting mechanism is in the second state, the auxiliary lifting mechanism and the lifting rope are not in transmission. The auxiliary hook falling mechanism for the crane hook can assist in hook falling of the hook, so that the hook does not need to be provided with more counterweights, the weight of the hook is effectively reduced, the purchase cost, the transportation cost and the use cost of the hook are reduced, and the actual hoisting capacity of the crane is improved. The utility model further provides a crane.

Description

Technical Field

[0001] The utility model relates to the technical field of crane structures, and in particular to a crane hook auxiliary falling hook mechanism and a crane. Background Art

[0002] When a crawler crane is operating, under the conditions of long boom length and multiple pulley ratios, due to the influence of the self-weight, friction and stiffness resistance of the steel wire rope, the hook often needs to add counterweights to achieve free falling at full height.

[0003] With the booming development of industries such as wind power at present, the requirements for the boom length and lifting capacity of crawler cranes are getting higher and higher; in order to meet the requirement of free falling at full height, the weight of the hook is getting heavier and heavier, and the number and weight of counterweights to be added are increasing. On the one hand, the increase in counterweights will not only make the purchase cost, transportation cost and use cost of the hook higher and higher, and the installation more and more complex; on the other hand, the increase in counterweights will increase the overall weight of the crawler crane and affect the actual lifting performance of the crawler crane (the heavier the counterweight, the smaller the actual lifting weight of the hook).

[0004] In view of this, it is necessary to design a crane hook auxiliary falling hook mechanism that can assist the hook to fall. Content of the Utility Model

[0005] The purpose of the utility model is to provide a crane hook auxiliary falling hook mechanism, aiming to solve or at least partially solve the deficiencies existing in the above background art. It can assist the hook to fall, so that there is no need to set too many counterweights on the hook, thereby effectively reducing the weight of the hook, reducing the purchase cost, transportation cost and use cost of the hook, and improving the actual lifting capacity of the crane.

[0006] The utility model provides a crane hook auxiliary falling hook mechanism, which includes a hoisting mechanism, a hook, an auxiliary lifting mechanism and a lifting rope. The first end of the lifting rope is connected to the hoisting mechanism, and the second end of the lifting rope is connected to the hook. The hoisting mechanism is used for winding and unwinding the lifting rope.

[0007] The auxiliary lifting mechanism is connected to the lifting rope. Along the moving direction of the lifting rope, the auxiliary lifting mechanism is arranged between the hoisting mechanism and the hook. The auxiliary lifting mechanism is used for driving the lifting rope to move towards the end close to the hook.

[0008] The auxiliary lifting mechanism has a first state and a second state; when the auxiliary lifting mechanism is in the first state, the auxiliary lifting mechanism is in transmission connection with the lifting rope; when the auxiliary lifting mechanism is in the second state, there is no transmission between the auxiliary lifting mechanism and the lifting rope.

[0009] Furthermore, the auxiliary lifting mechanism includes a driving mechanism, a clutch mechanism, and a transmission mechanism. The driving mechanism is connected to the transmission mechanism through the clutch mechanism, and the transmission mechanism is connected to the suspension rope. The clutch mechanism has an engaged state and a disengaged state.

[0010] When the auxiliary lifting mechanism is in the first state, the clutch mechanism is in the engaged state. At this time, the driving mechanism is in transmission connection with the transmission mechanism through the clutch mechanism. When the auxiliary lifting mechanism is in the second state, the clutch mechanism is in the disengaged state. At this time, there is no transmission between the driving mechanism and the transmission mechanism.

[0011] Furthermore, the driving mechanism includes a driving motor and a speed reducer. The clutch mechanism includes a clutch. The transmission mechanism includes a rotating member. The driving motor is connected to the input end of the speed reducer. The output end of the speed reducer is connected to the clutch. The clutch is connected to the rotating member. The suspension rope is wound around the rotating member.

[0012] When the auxiliary lifting mechanism is in the first state, the driving motor drives the rotating member to rotate through the speed reducer and the clutch in sequence, so as to drive the suspension rope to move towards the end close to the hook. When the auxiliary lifting mechanism is in the second state, there is no transmission between the driving motor and the rotating member. At this time, the rotating member can rotate following the suspension rope when the suspension rope moves.

[0013] Furthermore, the rotating member is a drum or a rope passing pulley.

[0014] Furthermore, it further includes a pulley block. The pulley block includes a fixed pulley block arranged at the top of the boom and a movable pulley block connected to the hook. The second end of the suspension rope is wound between the fixed pulley block and the movable pulley block. Along the moving direction of the suspension rope, the auxiliary lifting mechanism is arranged between the hoisting mechanism and the fixed pulley block.

[0015] Furthermore, the number of the suspension ropes is multiple. Each suspension rope is connected to at least one auxiliary lifting mechanism, and each suspension rope is respectively connected to a different auxiliary lifting mechanism.

[0016] Furthermore, the number of the suspension ropes is one or multiple. At least one suspension rope is connected to multiple auxiliary lifting mechanisms. The multiple auxiliary lifting mechanisms are arranged in sequence along the moving direction of the suspension rope. The multiple auxiliary lifting mechanisms can drive the suspension rope to move towards the end close to the hook simultaneously.

[0017] Furthermore, it further includes a control unit connected to the auxiliary lifting mechanism. The control unit is used to control the auxiliary lifting mechanism to switch between the first state and the second state.

[0018] The present utility model further provides a crane, comprising a boom and the above-mentioned auxiliary hook lowering mechanism of the crane hook, and the auxiliary lifting mechanism is arranged on the boom.

[0019] Furthermore, the number of the suspension ropes is one or more, at least one of the suspension ropes is connected with a plurality of the auxiliary lifting mechanisms, the plurality of the auxiliary lifting mechanisms are arranged in sequence along the moving direction of the suspension rope, and the plurality of the auxiliary lifting mechanisms can simultaneously drive the suspension rope to move towards one end close to the hook; the boom comprises a plurality of sub-boom sections connected in sequence along its length direction, and at least part of the auxiliary lifting mechanisms are respectively arranged on different sub-boom sections.

[0020] The auxiliary hook lowering mechanism of the crane hook provided by the present utility model can, by arranging an auxiliary lifting mechanism between the hoisting mechanism and the hook, drive the suspension rope to move towards one end close to the hook, so as to assist the hook in lowering the hook, such that there is no need to arrange a large amount of counterweight on the hook, thereby effectively reducing the weight of the hook, reducing the purchase cost, transportation cost and use cost of the hook, and improving the actual lifting capacity of the crane. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a crane hook lowering mechanism in the prior art.

[0022] Figure 2 It is a schematic structural diagram of a hook in the prior art.

[0023] Figure 3 It is a schematic structural diagram of the auxiliary hook lowering mechanism of the crane hook in the embodiment of the present utility model.

[0024] Figure 4 It is a schematic connection diagram of the control unit and the auxiliary lifting mechanism in the embodiment of the present utility model.

[0025] Figure 5 It is a schematic cross-sectional diagram of the auxiliary lifting mechanism in the embodiment of the present utility model.

[0026] Figure 6 It is a schematic structural diagram of the crane in the embodiment of the present utility model.

[0027] Figure 7 It is a schematic structural diagram of the crane in another embodiment of the present utility model. Detailed Description of the Embodiments

[0028] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0029] In the description and claims of the present utility model, terms such as "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily describe a specific order or sequence.

[0030] The orientation terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. (if any) involved in the description and claims of the present utility model are defined based on the position of the structure in the attached drawings and the relative positions of the structures to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of orientation terms should not limit the scope of protection claimed in this application.

[0031] Such as Figure 1 and Figure 2 , generally, the existing crane hook lowering mechanism includes a hoisting mechanism 1, a hook 2, a lifting rope 3 (the lifting rope 3 is generally a steel wire rope), and a pulley block 5. The pulley block 5 includes a rope passing pulley 53 and a fixed pulley set 51 arranged at the top of the boom (not shown in the figure) and a movable pulley set 52 connected to the hook 2. One end of the lifting rope 3 is connected to the hoisting mechanism 1, and the other end of the lifting rope 3 bypasses the rope passing pulley 53 and then winds between the fixed pulley set 51 and the movable pulley set 52. The hoisting mechanism 1 is used to wind and unwind the lifting rope 3, and the hoisting mechanism 1 and the hook 2 are respectively located on opposite sides of the boom.

[0032] When preparing to lower the hook after the lifting operation is completed, the hoisting mechanism 1 pays out the rope. If the height of the hook 2 is relatively high at this time, the length of the lifting rope 3 between the hook 2 and the fixed pulley set 51 is relatively short, that is, the weight of the lifting rope 3 between the hook 2 and the fixed pulley set 51 is relatively light, making the total weight on the hook 2 side relatively small and unable to freely lower the hook.

[0033] In order to enable the hook 2 to freely lower the hook, generally, a relatively heavy counterweight 21 is added to the hook 2 (the total gravity of the hook 2 and the counterweight 21 needs to be greater than the resultant force of the gravity, friction force, stiffness resistance, etc. of the lifting rope 3 on the side close to the hoisting mechanism 1 after being amplified by the pulley block 5). As the boom length and lifting capacity of the crane increase, the number and weight of the counterweights 21 added to the hook 2 are increasing, which will not only make the purchase cost, transportation cost and use cost of the hook 2 higher and higher, but also reduce the actual lifting capacity of the crane. Therefore, this method of continuously increasing the counterweight 21 cannot fundamentally solve the problem that the hook 2 cannot freely fall due to insufficient hook weight.

[0034] To solve the above problems, as Figures 3 to 6 shown, an embodiment of the present utility model provides a crane hook auxiliary lowering mechanism, which includes a hoisting mechanism 1, a hook 2, an auxiliary lifting mechanism 4, and a lifting rope 3 (the lifting rope 3 is generally a steel wire rope). The first end of the lifting rope 3 is connected to the hoisting mechanism 1, and the second end of the lifting rope 3 is connected to the hook 2. The hoisting mechanism 1 is used to wind and unwind the lifting rope 3.

[0035] The auxiliary lifting mechanism 4 is connected to the lifting rope 3; along the moving direction S of the lifting rope 3, the auxiliary lifting mechanism 4 is arranged between the hoisting mechanism 1 and the hook 2, and the auxiliary lifting mechanism 4 is used to drive the lifting rope 3 to move towards the end close to the hook 2.

[0036] The auxiliary lifting mechanism 4 has a first state and a second state; when the auxiliary lifting mechanism 4 is in the first state, the auxiliary lifting mechanism 4 is in transmission connection with the lifting rope 3, and at this time the auxiliary lifting mechanism 4 can drive the lifting rope 3 to move towards the end close to the hook 2; when the auxiliary lifting mechanism 4 is in the second state, there is no transmission between the auxiliary lifting mechanism 4 and the lifting rope 3, and at this time the auxiliary lifting mechanism 4 does not drive the lifting rope 3 to move, and the auxiliary lifting mechanism 4 is in an unloaded state, and the lifting rope 3 can move freely at the auxiliary lifting mechanism 4, that is, at this time the auxiliary lifting mechanism 4 does not affect the movement of the lifting rope 3.

[0037] For the crane hook auxiliary lowering mechanism provided by the embodiment of the present utility model, by arranging the auxiliary lifting mechanism 4 between the hoisting mechanism 1 and the hook 2, the auxiliary lifting mechanism 4 can drive the lifting rope 3 to move towards the end close to the hook 2, so as to assist the hook 2 to lower the hook, so that there is no need to set a large amount of counterweight on the hook 2, thereby effectively reducing the weight of the hook 2, reducing the purchase cost, transportation cost and use cost of the hook 2, and improving the actual lifting capacity of the crane.

[0038] Further, as Figure 3 and Figure 6 shown, in this embodiment, the hoisting mechanism 1 and the hook 2 are respectively arranged on opposite sides of the boom 7 of the crane, the auxiliary lifting mechanism 4 is fixedly arranged on the boom 7, and the auxiliary lifting mechanism 4 is located on the side of the boom 7 close to the hoisting mechanism 1 (that is, the auxiliary lifting mechanism 4 is arranged on the same side as the hoisting mechanism 1). The auxiliary lifting mechanism 4 can drive the lifting rope 3 to lift upwards, so that the lifting rope 3 moves towards the end close to the hook 2.

[0039] Further, as Figure 3 and Figure 6 shown, in this embodiment, the crane hook auxiliary lowering mechanism further includes a pulley block 5, the pulley block 5 includes a fixed pulley block 51 and a movable pulley block 52, the fixed pulley block 51 is arranged at the top end of the boom 7 (that is, the boom head of the boom 7), the movable pulley block 52 and the hook 2 are in a suspended state, and the movable pulley block 52 is connected to the hook 2; the second end of the lifting rope 3 is wound between the fixed pulley block 51 and the movable pulley block 52. Along the moving direction S of the lifting rope 3, the auxiliary lifting mechanism 4 is arranged between the hoisting mechanism 1 and the fixed pulley block 51.

[0040] Further, as Figure 3 and Figure 6As shown in the figure, in this embodiment, the pulley block 5 further includes a rope passing pulley 53. The rope passing pulley 53 is arranged at the top end of the boom 7, and the rope passing pulley 53 and the fixed pulley block 51 are respectively located on opposite sides of the top end of the boom 7. The rope passing pulley 53 is located on the side of the top end of the boom 7 close to the hoisting mechanism 1, and the fixed pulley block 51 is located on the side of the top end of the boom 7 close to the hook 2 (that is, along the moving direction S of the suspension rope 3, the rope passing pulley 53 is located between the hoisting mechanism 1 and the fixed pulley block 51); the second end of the suspension rope 3 bypasses the rope passing pulley 53 and then winds between the fixed pulley block 51 and the movable pulley block 52. Along the moving direction S of the suspension rope 3, the auxiliary hoisting mechanism 4 is arranged between the hoisting mechanism 1 and the rope passing pulley 53.

[0041] Further, as Figure 3 shown, in this embodiment, the number of the suspension ropes 3 is multiple (two are shown in the figure. In actual use, the number of the suspension ropes 3 is generally one or two), and at least one auxiliary hoisting mechanism 4 is connected to each suspension rope 3, and each suspension rope 3 is respectively connected to a different auxiliary hoisting mechanism 4. Since different suspension ropes 3 may not move synchronously during operation, different suspension ropes 3 are respectively connected to different auxiliary hoisting mechanisms 4, so as to realize the independent control of different suspension ropes 3. Of course, in other embodiments, the number of the suspension ropes 3 can also be one.

[0042] Specifically, as Figure 3 and Figure 6 shown, in this embodiment, the number of the suspension ropes 3 is two, and the two suspension ropes 3 are arranged in parallel. One auxiliary hoisting mechanism 4 is connected to each suspension rope 3, and the auxiliary hoisting mechanism 4 is arranged at the top of the boom 7. Of course, in other embodiments, the auxiliary hoisting mechanism 4 can also be arranged at other positions on the boom 7.

[0043] As Figure 7 shown, in another embodiment, the number of the suspension ropes 3 is one or multiple; at least one suspension rope 3 is connected to multiple auxiliary hoisting mechanisms 4, and the multiple auxiliary hoisting mechanisms 4 (the multiple auxiliary hoisting mechanisms 4 refer to the auxiliary hoisting mechanisms 4 connected to the same suspension rope 3) are arranged at intervals in sequence along the moving direction S of the suspension rope 3, and the multiple auxiliary hoisting mechanisms 4 can simultaneously drive the suspension rope 3 to move towards the end close to the hook 2. The boom 7 includes multiple sub-boom sections 71 connected in sequence along its length direction, and at least part of the auxiliary hoisting mechanisms 4 (the at least part of the auxiliary hoisting mechanisms 4 refer to the auxiliary hoisting mechanisms 4 connected to the same suspension rope 3) are respectively arranged on different sub-boom sections 71. As an implementation manner, each suspension rope 3 is connected to multiple auxiliary hoisting mechanisms 4, and the multiple auxiliary hoisting mechanisms 4 are respectively arranged on different sub-boom sections 71, that is, the multiple auxiliary hoisting mechanisms 4 are arranged in a distributed structure.

[0044] Specifically, on the one hand, by setting multiple auxiliary lifting mechanisms 4, compared with a single auxiliary lifting mechanism 4, the multiple auxiliary lifting mechanisms 4 can provide a greater total driving force, thus better assisting the hook 2 to lower the hook. Moreover, the power of each auxiliary lifting mechanism 4 can be set relatively small, and the force borne by each auxiliary lifting mechanism 4 is smaller, which is conducive to extending the service life of the auxiliary lifting mechanism 4. At the same time, when some of the auxiliary lifting mechanisms 4 are damaged, the other auxiliary lifting mechanisms 4 can still work normally, and the damaged auxiliary lifting mechanism 4 can be repaired / replaced separately, thereby reducing the maintenance cost. On the other hand, by distributing the multiple auxiliary lifting mechanisms 4 on each sub-boom section 71, not only can the force be dispersed to avoid stress concentration, but also the number of auxiliary lifting mechanisms 4 can be corresponded to the length of the boom 7 and the length of the hoisting rope 3, which is convenient for modular design (for example, one auxiliary lifting mechanism 4 is set on every 1-3 sub-boom sections 71; the longer the boom 7 and the hoisting rope 3 are, the more the number of auxiliary lifting mechanisms 4 is). When the lengths of the boom 7 and the hoisting rope 3 change, only the number of auxiliary lifting mechanisms 4 needs to be increased or decreased regularly, without the need for complex calculation of the power required by the auxiliary lifting mechanism 4 to be applicable to different models of cranes (if only one auxiliary lifting mechanism 4 is set, when the model of the crane changes, the lengths of the boom 7 and the hoisting rope 3 may also change, and at this time, the power required by the auxiliary lifting mechanism 4 needs to be recalculated).

[0045] Furthermore, as Figure 3 and Figure 5 shown, in this embodiment, the auxiliary lifting mechanism 4 includes a driving mechanism 41, a clutch mechanism 42 and a transmission mechanism 43. The driving mechanism 41 is connected to the transmission mechanism 43 through the clutch mechanism 42, and the transmission mechanism 43 is connected to the hoisting rope 3. The clutch mechanism 42 has an engaged state and a disengaged state; when the clutch mechanism 42 is in the engaged state, it can transmit power; when the clutch mechanism 42 is in the disengaged state, it cannot transmit power.

[0046] When the auxiliary lifting mechanism 4 is in the first state, the clutch mechanism 42 is in the engaged state. At this time, the driving mechanism 41 is in transmission connection with the transmission mechanism 43 through the clutch mechanism 42, so that the driving mechanism 41 can drive the hoisting rope 3 to move towards the end close to the hook 2 in sequence through the clutch mechanism 42 and the transmission mechanism 43. When the auxiliary lifting mechanism 4 is in the second state, the clutch mechanism 42 is in the disengaged state. At this time, there is no transmission between the driving mechanism 41 and the transmission mechanism 43, and the driving mechanism 41 cannot drive the hoisting rope 3 to move. At this time, the transmission mechanism 43 is in an idle state, thus not affecting the movement of the hoisting rope 3.

[0047] Furthermore, as Figure 3 and Figure 5As shown, in this embodiment, the driving mechanism 41 includes a driving motor 411 and a speed reducer 412, the clutch mechanism 42 includes a clutch 421, and the transmission mechanism 43 includes a rotating member 430. The driving motor 411 is connected to the input end of the speed reducer 412, the output end of the speed reducer 412 is connected to the clutch 421, the clutch 421 is connected to the rotating member 430, and the lifting rope 3 is wound around the rotating member 430. The clutch 421 has an engaged state and a disengaged state.

[0048] When the auxiliary lifting mechanism 4 is in the first state, the clutch 421 is in the engaged state, and the driving motor 411 drives the rotating member 430 to rotate sequentially through the speed reducer 412 and the clutch 421, so as to drive the lifting rope 3 to move towards the end close to the hook 2; when the auxiliary lifting mechanism 4 is in the second state, the clutch 421 is in the disengaged state, and there is no transmission between the driving motor 411 and the rotating member 430. At this time, the rotating member 430 is in an idle state, and the rotating member 430 can rotate (freely) following the lifting rope 3 when the lifting rope 3 moves.

[0049] Specifically, in this embodiment, the driving motor 411 can be a hydraulic motor or an electric motor, etc., and the clutch 421 can be a hydraulic clutch, an electromagnetic clutch, a mechanical clutch, a friction clutch, etc. The speed reducer 412 and the clutch 421 are coaxially arranged, and the output end of the speed reducer 412 is connected to the active part (not shown in the figure) of the clutch 421; the rotating member 430 is a drum 431, and the drum 431 is sleeved outside the speed reducer 412 and the clutch 421, and the inner wall of the drum 431 is connected to the driven part (not shown in the figure) of the clutch 421. A bearing 46 is provided between the drum 431 and the speed reducer 412 to enable the drum 431 to rotate smoothly relative to the speed reducer 412. At the same time, the auxiliary lifting mechanism 4 further includes a left bracket 44 and a right bracket 45. The speed reducer 412 is fixedly connected to the left bracket 44, and the clutch 421 is fixedly connected to the right bracket 45. The auxiliary lifting mechanism 4 can be installed on the boom 7 through the left bracket 44 and the right bracket 45.

[0050] When the crane is performing normal lifting operations, the clutch 421 is in the disengaged state, there is no transmission between the drive motor 411 and the drum 431, the drum 431 is in an unloaded state, and the drum 431 can freely rotate following the lifting rope 3 when the lifting rope 3 moves. When the crane needs to perform the operation of lowering the empty hook, the clutch 421 is in the engaged state, the driving force of the drive motor 411 is transmitted to the drum 431 after being decelerated and torque-increased by the speed reducer 412, causing the drum 431 to rotate, and then lifting the lifting rope 3 upward and moving it toward the end close to the hook 2; at the same time, control the hoisting mechanism 1 to pay out the lifting rope 3, and keep the hoisting mechanism 1 and the auxiliary lifting mechanism 4 moving synchronously. At this time, the function of lowering the empty hook of the hook 2 can be realized, and the disorder of the lifting rope 3 can be avoided (the auxiliary lifting mechanism 4 can provide a certain pre-tightening force to the lifting rope 3 to prevent the lifting rope 3 from getting disordered).

[0051] In other embodiments, the rotating member 430 can also be the rope passing pulley 53, that is, replace the above-mentioned drum 431 with the rope passing pulley 53; at this time, the auxiliary lifting mechanism 4 can be arranged at the original installation position of the rope passing pulley 53. By integrating the original rope passing pulley 53 into the auxiliary lifting mechanism 4, the structure can be simplified, the cost can be reduced, and the installation is convenient.

[0052] Of course, in other embodiments, the auxiliary lifting mechanism 4 can also be of other forms and structures.

[0053] Further, as Figures 3 to 5 shown, in this embodiment, the crane hook auxiliary lowering mechanism further includes a control unit 6 connected to the auxiliary lifting mechanism 4, and the control unit 6 is used to control the auxiliary lifting mechanism 4 to switch between the first state and the second state.

[0054] Specifically, in this embodiment, the control unit 6 is respectively connected to the drive mechanism 41 and the clutch mechanism 42. When the crane is performing normal lifting operations, the control unit 6 controls the drive mechanism 41 to be turned off (i.e., not operating) and the clutch mechanism 42 to be in the disengaged state; when the crane needs to perform the operation of lowering the empty hook, the control unit 6 controls the drive mechanism 41 to start and the clutch mechanism 42 to be in the engaged state. The control unit 6 can be specifically arranged in the cab of the crane (not shown in the figure).

[0055] As Figure 6 shown, an embodiment of the present invention further provides a crane, including a boom 7 and the above-mentioned crane hook auxiliary lowering mechanism, and the auxiliary lifting mechanism 4 is arranged on the boom 7.

[0056] Further, as Figure 6 shown, in this embodiment, the crane further includes a turntable 8, the hoisting mechanism 1 is arranged on the turntable 8, and the bottom end of the boom 7 is connected to the turntable 8.

[0057] Further, in this embodiment, the crane is a crawler crane, and the crane further includes a crawler chassis (not shown in the figure). The crawler chassis is located below the turntable 8 and is connected to the turntable 8. The crawler chassis is used to realize the walking and moving function of the crane.

[0058] In this embodiment, the design concept of the auxiliary hook lowering mechanism of the crane is as follows:

[0059] In order to enable the hook 2 to freely lower the hook, there is a set of complex calculation formulas for the minimum weight of the hook 2. For the convenience of understanding, it can be simply understood that the minimum weight of the hook 2 when lowering the hook is directly proportional to the tension of the hoisting rope 3 at the rope inlet of the fixed pulley block 51, inversely related to the pulley efficiency, and directly related to the rope threading multiple. Considering that the rope threading multiple is determined by the working conditions, when the rated lifting capacity is certain, only the single-rope tension can be increased. However, to increase the single-rope tension, a thicker hoisting rope 3 must be selected, which will cause an increase in the gravity of the boom-side hoisting rope 3 (i.e., the hoisting rope 3 close to the hoisting mechanism 1). At the same time, considering the lever amplification effect of the pulley block 5 on the gravity of the hoisting rope 3, to optimize the weight of the hook 2, the most feasible solution is to reduce the tension of the hoisting rope 3 at the rope inlet of the fixed pulley block 51. And the tension of the hoisting rope 3 at the rope inlet of the fixed pulley block 51 is mainly the gravity of the boom-side hoisting rope 3. Therefore, it is an effective and feasible solution to set the auxiliary lifting mechanism 4 to balance the gravity of the boom-side hoisting rope 3.

[0060] During actual use, the length of the boom 7 is not fixed under different working conditions, so the weight of the boom-side hoisting rope 3 is not a fixed value. Considering that the rope outlet end of the hoisting rope 3 is located on the hoisting mechanism 1 of the turntable 8, and the hoisting mechanism 1 can withstand a large tension, by adjusting the tension provided by the auxiliary lifting mechanism 4, it is ensured that the tension provided by the auxiliary lifting mechanism 4 is always greater than the gravity of the boom-side hoisting rope 3. At the same time, the addition of the auxiliary lifting mechanism 4 should not have a greater impact on the normal lifting operation of the crane and the design of the boom head structure of the boom 7.

[0061] The following specifically describes the working process of the auxiliary hook lowering mechanism of the crane:

[0062] 1. When the crane is performing normal lifting operations, the auxiliary lifting mechanism 4 is in the second state, that is, at this time, the auxiliary lifting mechanism 4 does not drive the hoisting rope 3 to move, the auxiliary lifting mechanism 4 is in the no-load state, and the hoisting rope 3 can move freely at the auxiliary lifting mechanism 4. The hoisting rope 3 is wound / unwound by the hoisting mechanism 1, so that the hook 2 can perform normal lifting operations.

[0063] 2. When the crane finishes the hoisting operation and is about to lower the hook, a hook-lowering signal is sent to the auxiliary lifting mechanism 4 through the control unit 6 in the cab. At this time, the auxiliary lifting mechanism 4 switches to the first state, the hoisting mechanism 1 pays out the rope (i.e., unreels the hoisting rope 3), and at the same time, the auxiliary lifting mechanism 4 lifts the boom-side hoisting rope 3 upward to offset the gravity of the boom-side hoisting rope 3, so that the tension of the hoisting rope 3 at the rope-entering position of the fixed pulley block 51 is almost zero. At this time, the movable pulley block 52 and the hook 2 freely fall under their own gravity, realizing the function of lowering the empty hook.

[0064] In traditional cranes, since the auxiliary lifting mechanism 4 is not provided, the self-weight of the hoisting rope 3 is reflected on the self-weight of the hook 2 in a positive correlation with the pulley ratio, resulting in the need for the hook 2 to add a very heavy additional counterweight. The weight of some counterweights is even greater than the weight of the hook 2 itself. This will reduce the actual lifting capacity of the crane, and the purchase cost, transportation cost, and usage cost of the hook 2 will remain high. Moreover, when designing the hook 2, due to different working conditions of the hook 2, it is necessary to separately calculate the weight of the hook 2 under each working condition, thus greatly increasing the design workload.

[0065] The advantages of the crane hook auxiliary hook-lowering mechanism provided in this embodiment include:

[0066] 1. It can improve the actual lifting capacity of the crane without changing the rated lifting capacity of the existing crane;

[0067] 2. It can effectively reduce the weight of the hook 2, lower the purchase cost, transportation cost, and usage cost of the hook 2, and improve the cost performance;

[0068] 3. It can once and for all solve the problem that the hook 2 cannot freely lower the hook due to insufficient hook weight from the root cause, and there is no need to separately calculate the weight of the hook 2 under each working condition.

[0069] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. An auxiliary hook-lowering mechanism for a crane hook, characterized in that, It includes a hoisting mechanism (1), a hook (2), an auxiliary hoisting mechanism (4) and a lifting rope (3). The first end of the lifting rope (3) is connected to the hoisting mechanism (1), and the second end of the lifting rope (3) is connected to the hook (2). The hoisting mechanism (1) is used for winding and unwinding the lifting rope (3). The auxiliary hoisting mechanism (4) is connected to the lifting rope (3). Along the moving direction (S) of the lifting rope (3), the auxiliary hoisting mechanism (4) is arranged between the hoisting mechanism (1) and the hook (2). The auxiliary hoisting mechanism (4) is used for driving the lifting rope (3) to move towards the end close to the hook (2). The auxiliary hoisting mechanism (4) has a first state and a second state. When the auxiliary hoisting mechanism (4) is in the first state, the auxiliary hoisting mechanism (4) is in transmission connection with the lifting rope (3). When the auxiliary hoisting mechanism (4) is in the second state, there is no transmission between the auxiliary hoisting mechanism (4) and the lifting rope (3).

2. The auxiliary hook-lowering mechanism of a crane hook according to claim 1, characterized in that, The auxiliary hoisting mechanism (4) includes a driving mechanism (41), a clutch mechanism (42) and a transmission mechanism (43). The driving mechanism (41) is connected to the transmission mechanism (43) through the clutch mechanism (42), and the transmission mechanism (43) is connected to the lifting rope (3). The clutch mechanism (42) has an engaged state and a disengaged state. When the auxiliary hoisting mechanism (4) is in the first state, the clutch mechanism (42) is in the engaged state. At this time, the driving mechanism (41) is in transmission connection with the transmission mechanism (43) through the clutch mechanism (42). When the auxiliary hoisting mechanism (4) is in the second state, the clutch mechanism (42) is in the disengaged state. At this time, there is no transmission between the driving mechanism (41) and the transmission mechanism (43).

3. The auxiliary hook-lowering mechanism of the crane hook according to claim 2, characterized in that The driving mechanism (41) includes a driving motor (411) and a speed reducer (412). The clutch mechanism (42) includes a clutch (421). The transmission mechanism (43) includes a rotating member (430). The driving motor (411) is connected to the input end of the speed reducer (412). The output end of the speed reducer (412) is connected to the clutch (421). The clutch (421) is connected to the rotating member (430). The lifting rope (3) is wound around the rotating member (430). When the auxiliary hoisting mechanism (4) is in the first state, the driving motor (411) drives the rotating member (430) to rotate through the speed reducer (412) and the clutch (421) in sequence, so as to drive the lifting rope (3) to move towards the end close to the hook (2). When the auxiliary hoisting mechanism (4) is in the second state, there is no transmission between the driving motor (411) and the rotating member (430). At this time, the rotating member (430) can rotate following the lifting rope (3) when the lifting rope (3) moves.

4. The auxiliary hook-lowering mechanism of the crane hook according to claim 3, characterized in that, The rotating member (430) is a drum (431) or a rope passing pulley (53).

5. The auxiliary hook-lowering mechanism of the crane hook according to claim 1, characterized in that It further includes a pulley block (5), the pulley block (5) includes a fixed pulley block (51) arranged at the top of the boom (7) and a movable pulley block (52) connected to the hook (2), and the second end of the hoisting rope (3) is wound between the fixed pulley block (51) and the movable pulley block (52); along the moving direction (S) of the hoisting rope (3), the auxiliary lifting mechanism (4) is arranged between the hoisting mechanism (1) and the fixed pulley block (51).

6. The auxiliary hook-lowering mechanism of a crane hook according to claim 1, characterized in that, The number of the hoisting ropes (3) is multiple, and at least one auxiliary lifting mechanism (4) is connected to each hoisting rope (3), and each hoisting rope (3) is respectively connected to a different auxiliary lifting mechanism (4).

7. The auxiliary hook-lowering mechanism of the crane hook according to claim 1, characterized in that, The number of the hoisting ropes (3) is one or more, at least one hoisting rope (3) is connected to multiple auxiliary lifting mechanisms (4), and the multiple auxiliary lifting mechanisms (4) are arranged in sequence along the moving direction (S) of the hoisting rope (3), and the multiple auxiliary lifting mechanisms (4) can simultaneously drive the hoisting rope (3) to move towards the end close to the hook (2).

8. The auxiliary hook-lowering mechanism of a crane hook according to any one of claims 1-7, characterized in that, It further includes a control unit (6) connected to the auxiliary lifting mechanism (4), and the control unit (6) is used to control the auxiliary lifting mechanism (4) to switch between a first state and a second state.

9. A crane, characterized in that, It includes a boom (7) and a crane hook auxiliary lowering mechanism as described in any one of claims 1-8, and the auxiliary lifting mechanism (4) is arranged on the boom (7).

10. The crane according to claim 9, characterized in that, The number of the hoisting ropes (3) is one or more, at least one hoisting rope (3) is connected to multiple auxiliary lifting mechanisms (4), and the multiple auxiliary lifting mechanisms (4) are arranged in sequence along the moving direction (S) of the hoisting rope (3), and the multiple auxiliary lifting mechanisms (4) can simultaneously drive the hoisting rope (3) to move towards the end close to the hook (2); the boom (7) includes multiple sub-boom sections (71) connected in sequence along its length direction, and at least part of the auxiliary lifting mechanisms (4) are respectively arranged on different sub-boom sections (71).

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