Safe hoisting mechanism with synchronous winding drums

Abstract

The safe hoisting mechanism comprises two driving devices, the two winding drums, a speed reducing mechanism, a synchronous gear box assembly, a fault detection device and a safe braking assembly, the two driving devices are connected with one sides of the two winding drums for driving through the speed reducing mechanism, and the synchronous gear box assembly is connected with the other sides of the two winding drums correspondingly; the synchronous gear box assembly is used for synchronous rotation of the two winding drums, the fault detection device is arranged in the synchronous gear box assembly and used for detecting load torque in the synchronous gear box assembly, and the safety braking assemblies are arranged on the two winding drums respectively and used for decelerating and braking the winding drums. The whole structure is simple, it is effectively ensured that normal operation can be achieved after one side of the speed reducing mechanism breaks down, the safety and timeliness of fault handling when dangerous goods are hoisted are greatly improved, the fault occurrence position can be detected in time, and the fault overhauling efficiency is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of winding drums, and in particular relates to a synchronous safety lifting mechanism for winding drums. Background Art

[0002] With the development of the lifting industry, the lifting capacity of cranes has gradually increased, and users' safety requirements for cranes have also gradually increased. In some special occasions, such as the foundry workshop of a steel plant and the nuclear island of a nuclear power plant, there is a mandatory requirement for the crane's hoisting mechanism to continue to operate after some parts fail.

[0003] At present, the lifting mechanism types that meet the above requirements in the industry are mainly divided into two categories:

[0004] The first type is a low-speed shaft rigid connection type, which uses dual motors, dual drums, two independent parallel shaft reducers or an integral large reducer structure, and the low-speed shaft is connected by a coupling or an idler wheel. This ensures that when the intermediate components or motors on one side of the transmission chain fail, the motor on the other side drives the dual drums to complete a working cycle. However, when the drum coupling or the reducer shaft system directly connected to the drum fails, the drum cannot move and the hoisted load cannot be operated.

[0005] The second type is the planetary reducer type, which uses dual motors, dual drums, a planetary reducer or a planetary reducer connected in series with two parallel shaft reducer structures. The high-speed shafts of the two motors are connected by the planetary reducer planetary package. This ensures that when a single-side transmission chain or motor fails, the dual drums driven by the other side motor can continue to work at half the rated speed. Similarly, when the drum coupling or the reducer shaft system directly connected to the drum fails, the drum cannot move and the hoisted load cannot be operated. This structural form is relatively complex, and due to the characteristics of the planetary transmission, a safety brake needs to be installed on the drum to prevent the load from falling.

[0006] Both types of lifting mechanisms mentioned above can eliminate the risk of load falling after failure to a certain extent. However, when the drum coupling or the corresponding reducer shaft system of the drum fails, the load cannot be operated on the faulty side. At this time, it is necessary to manually open the brake manual release device after stopping the machine and slowly drop the suspended object to the ground for disposal, which takes a long time. At the same time, the above lifting mechanisms also have shortcomings such as inability to work continuously and the need for manual intervention to switch working modes after failure, and there is a possibility that the safety risks at the fault site cannot be eliminated in time. Summary of the invention

[0007] In order to at least partially solve the technical problems existing in the above-mentioned prior art, the present invention provides a drum-synchronized safe lifting mechanism.

[0008] The synchronous safety lifting mechanism of the reel of the present invention comprises two driving devices, two reels, a speed reduction mechanism, a synchronous gearbox assembly, a fault detection device and a safety brake assembly, wherein the two driving devices are connected to one side of the two reels through the speed reduction mechanism for driving, the synchronous gearbox assembly is respectively connected to the other side of the two reels for synchronous rotation of the two reels, the fault detection device is arranged inside the synchronous gearbox assembly for detecting the load torque inside the synchronous gearbox assembly, and the safety brake assembly is respectively arranged on the two reels for decelerating and braking the reels, wherein:

[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 arranged in the middle of the mounting platform, and the floating shaft is rotatably arranged on the floating platform. The pressure sensor is arranged on the upper and lower sides of the mounting platform and abuts against the floating platform for monitoring the floating pressure of the floating platform. The limit switch is arranged between the mounting platform and the floating platform for fault warning.

[0010] Furthermore, in the above-mentioned drum-synchronized safe lifting mechanism, the deceleration mechanism includes a reducer and an input shaft brake, the reducer input end is respectively connected to the two drive device output ends, the reduction frame output end is respectively connected to the two drums, and the input shaft brake is respectively arranged at the reducer input end for braking the drive device output end.

[0011] Furthermore, in the above-mentioned drum synchronous safety lifting mechanism, the reducer is a planetary reducer.

[0012] Furthermore, in the above-mentioned drum synchronized safety lifting mechanism, 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 is arranged in the synchronous gearbox body through the first gear shaft, the third gear is arranged through the third gear shaft and the fourth gear is arranged through the fourth gear shaft, the second gear shaft is arranged between the first gear and the third gear through the floating shaft, the first gear, the second gear, the third gear and the fourth gear are all meshed with each other, and 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 above-mentioned drum synchronized safe lifting mechanism, the first gear shaft is transitionally matched with the first gear, and the first gear shaft is rotatably connected to the gear box, the third gear shaft is transitionally matched with the third gear, and the third gear shaft is rotatably connected to the gear box, the fourth gear shaft is transitionally matched with the fourth gear, and the fourth gear shaft is rotatably connected to the gear box, and the mounting platform is fixed to the synchronous gear box by bolts.

[0014] Furthermore, in the above-mentioned drum-synchronized safe lifting mechanism, the low-speed shaft coupling is respectively connected and fixed to the two drums.

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

[0016] The overall structure of the present invention is simple. Through the provision of a synchronous gearbox assembly, it is effectively ensured that when the transmission chain between the reel and the drive device on one side is damaged, all operations can still continue to be performed at full speed without switching the working mode. This effectively avoids the problem that the reel cannot be driven and the load cannot be handled in time when faults such as broken teeth occur in the reel coupling or the reducer shaft system directly connected to the reel. This greatly improves the safety and timeliness of fault handling when lifting dangerous goods. The fault location can be detected in time through the provision of the detection device, and the internal stress caused by the asynchronism of the reel is effectively eliminated through the floating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only used to further understand the embodiments of the present invention and constitute a part of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0018] Figure 1a The overall structural schematic diagram of the present invention is a safety lifting mechanism with a synchronous drum of a large-scale reducer;

[0019] Figure 1b The overall structural diagram of the present invention is a safety lifting mechanism in which the reducers are three small reducers and the drums are synchronized;

[0020] Figure 2 It is a structural schematic diagram of a fault detection device of a synchronous safety lifting mechanism of a reel according to the present invention;

[0021] Figure 3 A schematic diagram of the internal structure of a synchronous gearbox assembly of a drum-synchronous safety lifting mechanism of the present invention;

[0022] Figure 4 It is a schematic diagram of the load torque monitoring principle of the synchronous gearbox assembly of the drum synchronous safety lifting mechanism under normal working conditions of the present invention;

[0023] Figure 5 It is a schematic diagram of the load torque monitoring principle of the synchronous gearbox assembly under the left-side fault condition of the drum synchronous safety lifting mechanism of the present invention;

[0024] Figure 6 It is a schematic diagram of the load torque monitoring principle of the synchronous gearbox assembly under the right-side fault condition of the drum synchronous safety lifting mechanism of the present invention.

[0025] Description of reference numerals:

[0026] 1: driving device; 2: reel;

[0027] 3: speed reduction mechanism, 31: speed 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 table, 52: floating table, 53: floating shaft, 54: pressure sensor, 55: limit switch;

[0030] 6: Safety brake assembly. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] As shown in Figure 1 to Figure 3As shown, the drum synchronous safety lifting mechanism of the present invention comprises two driving devices 1, two drums 2, a speed reduction mechanism 3, a synchronous gearbox assembly 4, a fault detection device 5 and a safety brake assembly 6. The two driving devices 1 are connected to one side of the two drums 2 through the speed reduction mechanism 3 for driving. The synchronous gearbox assembly 4 is respectively connected to the other side of the two drums for synchronous rotation of the two drums. The fault detection device 5 is arranged inside the synchronous gearbox assembly 4 for detecting the load torque inside the synchronous gearbox assembly 4. The safety brake assembly 6 is respectively arranged on the two drums 2 for decelerating and braking the drums 2, wherein:

[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 set in the middle of the mounting platform 51, and the floating shaft 53 is rotatably set on the floating platform 52. The pressure sensor 54 is set on the upper and lower sides of the mounting platform 51 and abuts against the floating platform 52 for monitoring the floating pressure of the floating platform 52. The limit switch 55 is set between the mounting platform 51 and the floating platform 52 for fault warning.

[0034] Furthermore, in the drum-synchronized safe lifting mechanism of the present invention, the reduction mechanism 3 includes a reducer 31 and an input shaft brake 32. The input end of the reducer 31 is respectively connected to the output ends of the two drive devices 1, and the output end of the reduction frame is respectively connected to the two drums 2; so that when the reducer 31 is normal, the two drive devices 1 respectively drive the two drums 2; when one of the output ends of the reducer 31 is damaged, the two drive devices 1 can drive one drum 2 at the same time, and the input shaft brake 32 is respectively arranged at the input end of the reducer 31, for braking the output end of the drive device 1, thereby effectively avoiding the load falling and ensuring the safety of the lifting mechanism.

[0035] Preferably, if Figure 1a As shown, the reducer 31 is a dual-input dual-output integral large reducer, the input end of the integral large reducer is respectively connected to the output ends of the two drive devices 1, and the output end of the integral large reducer is respectively connected to the two reels 2 through a reel coupling.

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

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

[0038] Further, in the drum synchronous safety lifting mechanism of the present invention, the synchronous gear box assembly 4 includes a synchronous gear box 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 gear box body 41 through the first gear shaft 46, the third gear 44 is arranged through the third gear shaft 47 and the fourth gear 45 is arranged through the fourth gear shaft 48, and the second gear shaft is arranged between the first gear 42 and the third gear through the floating shaft 53. The wheels 44, the first gear 42, the second gear 43, the third gear 44 and the fourth gear 45 are all meshed with each other, and the first gear shaft 46 and the fourth gear shaft 48 are respectively provided with a low-speed shaft coupling 49 at one end, so that the floating shaft 53 drives the floating platform 52 to move up and down in the mounting platform 51 through the force of the first gear 42 and the third gear 44 on the second gear 43, so as to determine the approximate location of the fault, and the setting of the floating shaft 53 can also eliminate the internal stress caused by the asynchronous transmission chains on both sides of the synchronous gear box assembly 4.

[0039] Furthermore, in the drum synchronized safe lifting mechanism of the present invention, the first gear shaft 46 is transitionally matched with the first gear 42, the first gear shaft 46 is rotationally connected to the gear box body, the third gear shaft 47 is transitionally matched with the third gear 44, the third gear shaft 47 is rotationally connected to the gear box body, the fourth gear shaft 48 is transitionally matched with the fourth gear 45, the fourth gear shaft 48 is rotationally connected to the gear box body, and the mounting platform 51 is fixed to the synchronous gear box body 41 by bolts, thereby effectively ensuring the synchronous transmission of the synchronous gear box assembly 4.

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

[0041] Specifically, in normal operation, the two reels 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 the drive shaft is broken or one of the drum couplings fails, the torque provided by the two drive devices 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 device 1 has not changed, all operations can still be performed at full speed. Under this working condition, the load of the remaining normally working transmission chain components (drive shaft, reducer gear, drum coupling) is twice the torque of the normal working condition;

[0043] When the reducer 31 is a planetary reducer, and the planetary package fails or the input shaft brake 32 on one side of the planetary reducer fails, the low-speed shaft of the transmission chain on the failed side can rotate freely. At this time, the torque of the drum 2 on the side where the heavy load is generated is transmitted by the synchronous gear box assembly 4 to the drum 2 on the other side, and then braked by the normally working input shaft brake 32. The load will not fall. The synchronization and safety of the lifting mechanism are ensured, and the safety redundancy of the lifting mechanism is further increased by setting the safety brake assembly 6 to brake the drum 2.

[0044] When the fault detection device 5 performs detection, since there is no need to switch the working mode after a single-side 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 to determine the general location of the fault. The setting of the floating shaft 53 can also eliminate the internal stress caused by the asynchronism of the transmission chains on both sides of the mechanism.

[0045] The detection principle is: Figures 4 to 6 As shown, Fu is the force exerted by the first gear 42 and the third gear 44 on the second gear 43, and the arrows in the first gear 42, the second gear 43, the third gear 44 and the fourth gear 45 indicate the driving force and torque direction 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 reel 2 through the low-speed shaft coupling 49, there is no torque transmission, the circumferential forces Fu acting on the second gear 43 cancel each other out, the second gear 43 is placed on the pressure sensor 54 only by its own weight without being pressed, and the limit switch 55 is not toggled.

[0047] When the left side fails, the first gear 42 is passively loaded by the torque of the reel 2, and the fourth gear 45 is still driven by the normal side reel 2. The torque is transmitted from the fourth gear 45 to the first gear 42, and the circumferential force acting on the second gear 43 acts upward, and the second gear 43 is pressed upward. The combined force of the circumferential force compresses the pressure sensor 54 installed on the upper part and presses the limit switch 55 upward.

[0048] When the right side fails, the fourth gear 45 is passively loaded by the torque of the reel 2, and the first gear 42 is still driven by the normal side reel 2. The torque is transmitted from the first gear 42 to the fourth gear 45, and the circumferential force acting on the second gear 43 acts downward, and the second gear 43 is pressed downward. The resultant force of the circumferential force compresses the pressure sensor 54 installed on the upper part and presses the limit switch 55 downward.

[0049] The force applied to the floating shaft 53 and the movement direction of the limit switch 55 are used to warn the transmission chain of a fault and to indicate the approximate location of the fault.

[0050] To sum up, compared with the prior art, the synchronous safety lifting mechanism of the reel of the present invention has the following advantages and beneficial effects: the overall structure of the present invention is simple, and through the setting of the synchronous gearbox assembly, it effectively ensures that when the transmission chain between the reel and the drive device on one side is damaged, all operations can still continue to be performed at full speed without switching the working mode. It effectively avoids the problem that the reel cannot be driven and the load cannot be handled in time when faults such as broken teeth occur in the reel coupling or the reducer shaft system directly connected to the reel. It greatly improves the safety and timeliness of fault handling when lifting dangerous goods. The fault location can be detected in time through the setting of the detection device, and the internal stress caused by the asynchronism of the reel is effectively eliminated through the floating shaft.

[0051] It should be noted that, in this article, unless otherwise clearly specified and limited, the term "connection" or its synonyms should be understood in a broad sense. 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A synchronous safety lifting mechanism for a reel, characterized in that: The synchronous safety lifting mechanism of the reel comprises two driving devices, two reels, a reduction mechanism, a synchronous gearbox assembly, a fault detection device and a safety brake assembly. The two driving devices are connected to one side of the two reels through the reduction mechanism for driving. The synchronous gearbox assemblies are respectively connected to the other sides of the two reels for synchronous rotation of the two reels. The fault detection device is arranged inside the synchronous gearbox assembly for detecting the load torque inside the synchronous gearbox assembly. The safety brake assembly is respectively arranged on the two reels for decelerating and braking the reels, wherein: 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 arranged in the middle of the mounting platform, and the floating shaft is rotatably arranged on the floating platform. The pressure sensor is arranged on the upper and lower sides of the mounting platform and abuts against the floating platform for monitoring the floating pressure of the floating platform. The limit switch is arranged between the mounting platform and the floating platform for fault warning.

2. The drum synchronous safety lifting mechanism according to claim 1, characterized in that: The deceleration mechanism includes a reducer and an input shaft brake. The input end of the reducer is respectively connected to the two output ends of the driving devices, the output end of the reduction frame is respectively connected to the two reels, and the input shaft brake is respectively arranged at the input end of the reducer for braking the output end of the driving device.

3. The synchronous safety lifting mechanism of the reel according to claim 2 is characterized in that: The reducer is a planetary reducer.

4. The drum synchronous safety lifting mechanism according to claim 1, characterized in that: 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 is arranged in the synchronous gearbox body through the first gear shaft, the third gear is arranged through the third gear shaft and the fourth gear is arranged through the fourth gear shaft. The second gear shaft is arranged between the first gear and the third gear through the floating shaft. The first gear, the second gear, the third gear and the fourth gear are all meshed with each other. Low-speed shaft couplings are respectively provided at one end of the first gear shaft and the fourth gear shaft.

5. The synchronous safety lifting mechanism for the reel according to claim 4 is characterized in that: The first gear shaft is transitionally matched with the first gear, and the first gear shaft is rotatably connected to the gear box body. The third gear shaft is transitionally matched with the third gear, and the third gear shaft is rotatably connected to the gear box body. The fourth gear shaft is transitionally matched with the fourth gear, and the fourth gear shaft is rotatably connected to the gear box body. The mounting platform is fixed to the synchronous gear box body by bolts.

6. The synchronous safety lifting mechanism for the reel according to claim 4 is characterized in that: The low-speed shaft coupling is respectively connected and fixed to the two reels.

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