Synchronous safety lifting mechanism for drums

Abstract

This invention discloses a safe lifting mechanism for synchronized drums, comprising two drive units, two drums, a reduction mechanism, a synchronous gearbox assembly, a fault detection device, and a safety braking assembly. The two drive units are connected to one side of each drum via the reduction mechanism. The synchronous gearbox assembly is connected to the other side of each drum for synchronous rotation. The fault detection device is located inside the synchronous gearbox assembly to detect the load torque within the assembly. The safety braking assembly is located on each drum for decelerating and braking the drums. This invention has a simple overall structure and effectively ensures normal operation even after a fault occurs on one side of the reduction mechanism. This greatly improves the safety and timeliness of handling faults when lifting hazardous materials, allowing for timely detection of the fault location and effectively improving fault repair efficiency.

Description

Technical Field

[0001] This invention belongs to the field of drum technology, and particularly relates to a safe lifting mechanism for synchronous drum lifting. Background Technology

[0002] With the development of the crane industry, the lifting capacity of cranes is gradually increasing, and users' requirements for the safety of cranes are also gradually increasing. In some special occasions, such as steel mill foundry workshops and nuclear power plant nuclear islands, there are mandatory requirements for cranes to continue operating after some parts of the lifting mechanism have failed.

[0003] Currently, the lifting mechanisms in the industry that meet the above requirements are mainly divided into two categories:

[0004] The first type is a low-speed shaft rigid connection type, which adopts a structure of dual motors, dual drums, two independent parallel shaft reducers or a single large reducer. The low-speed shaft is connected by a coupling or idler wheel. This ensures that if a component or motor in the middle of one side of the drive chain fails, the other motor can drive the dual drums to complete one work cycle. However, if the drum coupling or the reducer shaft system directly connected to the drum fails, the drum cannot move, and the load being lifted cannot be operated.

[0005] The second type is the planetary reducer type, which employs a dual-motor, dual-drum, and one planetary reducer or one planetary reducer connected in series with two parallel shaft reducers. The high-speed shafts of the two motors are connected by planetary gearboxes in the planetary reducer. This ensures that if one side of the drive chain or motor fails, the other motor can drive the dual drums to continue working at half the rated speed. Similarly, if the drum coupling or the reducer shaft system directly connected to the drum fails, the drum cannot move, and the lifted load cannot be operated. This structure is relatively complex, and due to the planetary transmission characteristics, a safety brake needs to be installed on the drum to prevent the load from falling.

[0006] Both types of hoisting mechanisms can mitigate the risk of load falling after failure to some extent. However, when the drum coupling or the corresponding reducer shaft system malfunctions, the load cannot be operated on the faulty side. In this case, the machine must be stopped, and the brake release device must be manually activated to slowly lower the load to the ground, which takes a considerable amount of time. Furthermore, these hoisting mechanisms also have drawbacks such as inability to operate continuously and the need for manual intervention to switch operating modes after a failure, potentially leading to untimely elimination of safety risks at the fault site. Summary of the Invention

[0007] To at least partially solve the technical problems existing in the prior art, the present invention provides a safe lifting mechanism for drum synchronization.

[0008] The drum synchronization safety lifting mechanism of the present invention includes two drive devices, two drums, a reduction mechanism, a synchronization gearbox assembly, a fault detection device, and a safety braking assembly. The two drive devices are connected to one side of the two drums via the reduction mechanism. The synchronization gearbox assembly is connected to the other side of each of the two drums for synchronous rotation. The fault detection device is disposed inside the synchronization gearbox assembly for detecting the load torque inside the synchronization gearbox assembly. The safety braking assembly is disposed on each of the two drums for decelerating and braking the drums.

[0009] The fault detection device includes a mounting platform, a floating platform, a floating shaft, a pressure sensor, and a limit switch. The floating platform is slidably disposed in the middle of the mounting platform, the floating shaft is rotatably disposed on the floating platform, the pressure sensor is disposed on the upper and lower sides of the mounting platform and abuts against the floating platform to monitor the floating pressure of the floating platform, and the limit switch is disposed between the mounting platform and the floating platform for fault warning.

[0010] Furthermore, in the aforementioned safe lifting mechanism for synchronized drums, the deceleration mechanism includes a reducer and an input shaft brake. The input end of the reducer is connected to the output ends of the two drive devices respectively, and the output end of the reducer frame is connected to the two drums respectively. The input shaft brake is respectively disposed at the input end of the reducer and is used to brake the output end of the drive device.

[0011] Furthermore, in the aforementioned synchronous safety lifting mechanism for the drum, the reducer is a planetary reducer.

[0012] Furthermore, in the aforementioned safe lifting mechanism for drum synchronization, the synchronous gearbox assembly includes a synchronous gearbox body, a first gear, a second gear, a third gear, a fourth gear, a first gear shaft, a third gear shaft, and a fourth gear shaft. The first gear, the third gear, and the fourth gear are arranged in the synchronous gearbox body via the first gear shaft, the third gear via the third gear shaft, and the fourth gear via the fourth gear shaft. The second gear shaft is disposed between the first gear and the third gear via the floating shaft. The first gear, the second gear, the third gear, and the fourth gear are all meshed with each other. A low-speed shaft coupling is respectively provided at one end of the first gear shaft and the fourth gear shaft.

[0013] Furthermore, in the aforementioned synchronous safety lifting mechanism for the drum, the first gear shaft is transitionally engaged with the first gear, and the first gear shaft is rotatably connected to the gearbox body; the third gear shaft is transitionally engaged with the third gear, and the third gear shaft is rotatably connected to the gearbox body; the fourth gear shaft is transitionally engaged with the fourth gear, and the fourth gear shaft is rotatably connected to the gearbox body; and the mounting platform is fixed to the synchronous gearbox body by bolts.

[0014] Furthermore, in the aforementioned safe lifting mechanism for synchronized drums, the low-speed shaft coupling is fixedly connected to both drums respectively.

[0015] The drum synchronous safety lifting mechanism of the present invention has the following advantages and beneficial effects:

[0016] The invention has a simple overall structure. By setting up a synchronous gearbox assembly, it effectively ensures that all operations can continue to be performed at full speed even if the transmission chain between one side of the drum and the drive device is damaged, without the need to switch working modes. It effectively avoids the problem that the drum cannot be driven and the load cannot be handled in time when there are faults such as broken teeth in the drum coupling or the reducer shaft system directly connected to the drum. It greatly improves the safety and timeliness of handling faults when hoisting dangerous goods. The detection device can detect the location of the fault in time, and the floating shaft can effectively eliminate the internal stress caused by the asynchronous operation of the drum. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0018] Figure 1a This is a schematic diagram of the overall structure of the safety lifting mechanism for the drum synchronization of a large speed reducer, as described in the present invention.

[0019] Figure 1b This is a schematic diagram of the overall structure of the safety lifting mechanism for the synchronous lifting of drums of three small reducers in this invention.

[0020] Figure 2 This is a schematic diagram of the fault detection device of the drum synchronization safety lifting mechanism of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the synchronous gearbox assembly of the drum synchronous safety lifting mechanism of the present invention.

[0022] Figure 4 This is a schematic diagram illustrating the load torque monitoring principle of the synchronous gearbox assembly under normal operating conditions of the safe lifting mechanism for drum synchronization according to the present invention.

[0023] Figure 5 This is a schematic diagram of the load torque monitoring principle of the synchronous gearbox assembly under the fault condition of the left side of the safe lifting mechanism for drum synchronization of the present invention.

[0024] Figure 6 This is a schematic diagram illustrating the load torque monitoring principle of the synchronous gearbox assembly under fault conditions on the right side of the safe lifting mechanism for drum synchronization according to the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1: Drive unit; 2: Drum;

[0027] 3: Reduction mechanism; 31: Reducer; 32: Input shaft brake;

[0028] 4: Synchronous gearbox assembly; 41: Synchronous gearbox body; 42: First gear; 43: Second gear; 44: Third gear; 45: Fourth gear; 46: First gear shaft; 47: Third gear shaft; 48: Fourth gear shaft; 49: Low-speed shaft coupling.

[0029] 5: Fault detection device; 51: Mounting platform; 52: Floating platform; 53: Floating shaft; 54: Pressure sensor; 55: Limit switch;

[0030] 6: Safety braking components. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0032] As shown in Figure 1 to Figure 3As shown, the drum synchronization safety lifting mechanism of the present invention includes two drive units 1, two drums 2, a reduction mechanism 3, a synchronization gearbox assembly 4, a fault detection device 5, and a safety braking assembly 6. The two drive units 1 are connected to one side of the two drums 2 via the reduction mechanism 3 for driving. The synchronization gearbox assembly 4 is connected to the other side of the two drums respectively for synchronous rotation of the two drums. The fault detection device 5 is located inside the synchronization gearbox assembly 4 for detecting the load torque inside the synchronization gearbox assembly 4. The safety braking assembly 6 is located on the two drums 2 respectively for decelerating and braking the drums 2.

[0033] The fault detection device 5 includes a mounting platform 51, a floating platform 52, a floating shaft 53, a pressure sensor 54, and a limit switch 55. The floating platform 52 is slidably disposed in the middle of the mounting platform 51, and the floating shaft 53 is rotatably disposed on the floating platform 52. The pressure sensor 54 is disposed on the upper and lower sides of the mounting platform 51 and abuts against the floating platform 52 to monitor the floating pressure of the floating platform 52. The limit switch 55 is disposed between the mounting platform 51 and the floating platform 52 for fault warning.

[0034] Furthermore, in the drum synchronization safety lifting mechanism of the present invention, the deceleration mechanism 3 includes a reducer 31 and an input shaft brake 32. The input end of the reducer 31 is connected to the output ends of two drive devices 1 respectively, and the output ends of the reducer frame are connected to two drums 2 respectively. Thus, under normal conditions, the two drive devices 1 drive the two drums 2 respectively. When one of the output ends of the reducer 31 is damaged, the two drive devices 1 can drive one drum 2 simultaneously. The input shaft brake 32 is respectively installed at the input end of the reducer 31 and is used to brake the output end of the drive device 1, effectively preventing the load from falling and ensuring the safety of the lifting mechanism.

[0035] Preferably, such as Figure 1a As shown, the reducer 31 is a dual-input dual-output integrated large reducer. The input end of the integrated large reducer is connected to the output end of the two drive devices 1 respectively, and the output end of the integrated large reducer is connected to the two drums 2 respectively through the drum coupling.

[0036] Preferably, such as Figure 1b As shown, reducer 31 consists of three small reducers, one of which is a dual-input dual-output reducer, and the other two are single-input single-output small reducers. The single-input single-output small reducers are arranged in parallel with the dual-input dual-output small reducers. The input end of the dual-input dual-output small reducer is connected to the output end of the two drive devices 1 respectively, and the output end of the dual-input dual-output small reducer is connected to the input end of the two single-input single-output small reducers respectively. The output ends of the two single-input single-output small reducers are connected to the two drums 2 respectively through drum couplings.

[0037] Furthermore, in the drum synchronization safety lifting mechanism of the present invention, the reducer 31 is a planetary reducer.

[0038] Furthermore, in the safe lifting mechanism for drum synchronization of the present invention, the synchronous gearbox assembly 4 includes a synchronous gearbox body 41, a first gear 42, a second gear 43, a third gear 44, a fourth gear 45, a first gear shaft 46, a third gear shaft 47, and a fourth gear shaft 48. The first gear 42 is arranged in the synchronous gearbox body 41 via the first gear shaft 46, the third gear 44 via the third gear shaft 47, and the fourth gear 45 via the fourth gear shaft 48. The second gear shaft is connected between the first gear 42 and the third gear shaft 45 via a floating shaft 53. The gears 44, 42, 43, 44, and 45 are all meshed with each other. The first gear shaft 46 and the fourth gear shaft 48 are respectively provided with low-speed shaft couplings 49. The force exerted by the first gear 42 and the third gear 44 on the second gear 43 causes the floating shaft 53 to drive the floating platform 52 to move up and down within the mounting platform 51, thereby determining the approximate location of the fault. The floating shaft 53 system can also eliminate the internal stress caused by the asynchronous transmission chains on both sides of the synchronous gearbox assembly 4.

[0039] Furthermore, in the safety lifting mechanism for drum synchronization of the present invention, the first gear shaft 46 is transitionally engaged with the first gear 42, and the first gear shaft 46 is rotatably connected to the gearbox body; the third gear shaft 47 is transitionally engaged with the third gear 44, and the third gear shaft 47 is rotatably connected to the gearbox body; the fourth gear shaft 48 is transitionally engaged with the fourth gear 45, and the fourth gear shaft 48 is rotatably connected to the gearbox body; the mounting platform 51 is fixed to the synchronous gearbox body 41 by bolts, thereby effectively ensuring synchronous transmission of the synchronous gearbox assembly 4.

[0040] Furthermore, in the safe lifting mechanism for drum synchronization of the present invention, the low-speed shaft coupling 49 is connected and fixed to the two drums 2 respectively, thereby effectively ensuring that the two drums 2 rotate synchronously.

[0041] Specifically, during normal operation, the two drums 2 are driven at the same speed, so the synchronous gearbox assembly 4 only runs unloaded and does not transmit torque;

[0042] When the transmission chain on one side of the reduction mechanism 3 is damaged, such as when the drive shaft breaks or one of the drum couplings fails, the torque provided by the two drive units 1 is transmitted to the normal side drum 2 through the normal side transmission chain, and then the torque is transmitted from one drum 2 to the other drum 2 through the synchronous gear assembly to continue operating the crane. Since the total power provided by the drive unit 1 has not changed, all operations can still be performed at full speed. Under this condition, the load on the remaining normally operating transmission chain components (drive shaft, reducer gear, drum coupling) is twice the torque under normal operating conditions.

[0043] When the reducer 31 is a planetary reducer, and a planetary gearbox malfunctions or one side of the input shaft brake 32 of the planetary reducer fails, the low-speed shaft of the transmission chain on the faulty side can rotate freely. At this time, the torque of the drum 2 on the side where the load is generated is transmitted from the synchronous gearbox assembly 4 to the other drum 2, and then braked by the normally functioning input shaft brake 32. This prevents the load from falling. It ensures the synchronization and safety of the lifting mechanism, and further increases the safety redundancy of the lifting mechanism by braking the drum 2 with the safety brake assembly 6.

[0044] When the fault detection device 5 performs the detection, since there is no need to switch the working mode after a single-sided transmission chain failure, and the working speed remains unchanged, the load torque of the synchronous gearbox assembly 4 is used to detect the force direction of the floating shaft 53 system, thereby determining the approximate location of the fault. The floating shaft 53 can also eliminate the internal stress caused by the asynchronous transmission chains on both sides of the mechanism.

[0045] The detection principle is as follows: Figures 4 to 6 As shown, Fu represents the force exerted by the first gear 42 and the third gear 44 on the second gear 43. The arrows in the first gear 42, the second gear 43, the third gear 44, and the fourth gear 45 indicate the direction of the driving force and torque in the current state.

[0046] Under normal operating conditions, the first gear 42 and the fourth gear 45 are driven at the same speed by the drum 2 through the low-speed shaft coupling 49, with no torque transmission. The circumferential force Fu acting on the second gear 43 cancels each other out. The second gear 43 rests on the pressure sensor 54 by its own weight without being pressed, and the limit switch 55 is not activated.

[0047] When the left side is in fault condition, the first gear 42 is passively loaded by the torque of the drum 2, while the fourth gear 45 is still driven by the normal side drum 2. The torque is transmitted from the fourth gear 45 to the first gear 42. The circumferential force acting on the second gear 43 is upward, and the second gear 43 is pressed upward. The resultant force of the circumferential force compresses the pressure sensor 54 installed at the top and presses the limit switch 55 upward.

[0048] When the right side is in a faulty condition, the fourth gear 45 is passively loaded by the torque of the drum 2, while the first gear 42 is still driven by the normal side drum 2. The torque is transmitted from the first gear 42 to the fourth gear 45. The circumferential force acting on the second gear 43 is downward, and the second gear 43 is pressed down. The resultant force of the circumferential force compresses the pressure sensor 54 installed at the top and presses down the limit switch 55.

[0049] The fault in the transmission chain and the approximate location of the fault are indicated by the force on the floating shaft 53 and the direction of action of the limit switch 55.

[0050] In summary, compared with the prior art, the drum synchronization safety lifting mechanism of the present invention has the following advantages and beneficial effects: The overall structure of the present invention is simple. By setting the synchronous gearbox assembly, it effectively ensures that all operations can continue to be executed at full speed when the transmission chain between one drum and the drive device is damaged, without the need to switch working modes. It effectively avoids the problem that the drum cannot be driven and the load cannot be handled in time when there are faults such as broken teeth in the drum coupling or the reducer shaft system directly connected to the drum. It greatly improves the safety and timeliness of handling faults when hoisting dangerous goods. The detection device can detect the location of the fault in time, and the floating shaft effectively eliminates the internal stress caused by the asynchronous operation of the drum.

[0051] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A safe lifting mechanism for synchronized drum lifting, characterized in that, The synchronized safety lifting mechanism for the drums includes two drive units, two drums, a reduction mechanism, a synchronized gearbox assembly, a fault detection device, and a safety braking assembly. The two drive units are connected to one side of each of the two drums via the reduction mechanism. The synchronized gearbox assembly is connected to the other side of each of the two drums for synchronized rotation. The fault detection device is located inside the synchronized gearbox assembly to detect the load torque inside the assembly. The safety braking assembly is located on each of the two drums for decelerating and braking them. The fault detection device includes a mounting platform, a floating platform, a floating shaft, a pressure sensor, and a limit switch. The floating platform is slidably disposed in the middle of the mounting platform, the floating shaft is rotatably disposed on the floating platform, the pressure sensor is disposed on the upper and lower sides of the mounting platform and abuts against the floating platform to monitor the floating pressure of the floating platform, and the limit switch is disposed between the mounting platform and the floating platform for fault warning. The synchronous gearbox assembly includes a synchronous gearbox body, a first gear, a second gear, a third gear, a fourth gear, a first gear shaft, a third gear shaft, and a fourth gear shaft. The first gear, the third gear, and the fourth gear are arranged in the synchronous gearbox body via the first gear shaft, the third gear, and the fourth gear via the third gear shaft. The second gear is disposed between the first gear and the third gear via the floating shaft. The first gear, the second gear, the third gear, and the fourth gear are all meshed with each other. A low-speed shaft coupling is respectively provided at one end of the first gear shaft and the fourth gear shaft. The mounting platform is fixed to the synchronous gearbox body by bolts.

2. The synchronous safety lifting mechanism for the drum according to claim 1, characterized in that, The deceleration mechanism includes a speed reducer and an input shaft brake. The input end of the speed reducer is connected to the output ends of the two drive devices respectively, and the output end of the speed reducer is connected to the two drums respectively. The input shaft brake is respectively disposed at the input end of the speed reducer and is used to brake the output end of the drive devices.

3. The synchronous safety lifting mechanism for the drum according to claim 2, characterized in that, The speed reducer is a planetary speed reducer.

4. The synchronous safety lifting mechanism for the drum according to claim 1, characterized in that, The first gear shaft is transitionally fitted to the first gear, and the first gear shaft is rotatably connected to the gearbox body. The third gear shaft is transitionally fitted to the third gear, and the third gear shaft is rotatably connected to the gearbox body. The fourth gear shaft is transitionally fitted to the fourth gear, and the fourth gear shaft is rotatably connected to the gearbox body.

5. The synchronous safety lifting mechanism for the drum according to claim 1, characterized in that, The low-speed shaft coupling is fixedly connected to both of the drums.

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