Automatic tightening tool for large speed reducer bearing locking nut

Abstract

The application provides a large-scale speed reducer bearing locking nut automatic tightening tool, which solves the problem of insufficient locking nut assembly torque and the like, and comprises a hydraulic driving system and a hydraulic motor driven and controlled by the hydraulic driving system, the output end of the hydraulic motor is transmissionally connected with a tightening mechanism, the tightening mechanism is internally provided with a variable speed assembly and a clamping assembly transmissionally connected with the variable speed assembly, and has the advantages of stable structure, convenient nut disassembly and assembly and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of speed reducer assembly, and particularly relates to an automatic tightening tool for bearing locking nuts of a large speed reducer. BACKGROUND

[0002] A speed reducer is an independent component composed of gear transmission, worm transmission or gear and worm transmission enclosed in a rigid shell, and is commonly used as a speed reduction transmission device between a prime mover and a working machine. The speed reducer matches the rotational speed and transmits the torque between the prime mover and the working machine or actuator, and is widely used in modern machinery. The existing winch converts electrical energy into mechanical energy through the motor, that is, the rotor of the motor rotates and outputs, and drives the drum to rotate after being decelerated by the speed reducer, the drum winds the steel wire rope and passes through the pulley block, so that the crane hook is lifted or lowered. The locking nut in the winch speed reducer is connected and fixed with the supporting shaft through the threaded connection mode, the existing locking nut of the speed reducer meets the high pressure sealing requirement, and a large pre-tightening force needs to be applied. However, the existing locking nut assembly often adopts manual tightening, and the pre-tightening force cannot be accurately controlled. In addition, the locking nut is often tightened by a lever, which usually requires the cooperation of multiple people, has high labor intensity, and workers are prone to fatigue and have many safety hazards.

[0003] In order to solve the problems in the prior art, people have carried out long-term exploration and proposed various solutions. For example, Chinese patent document discloses a hydraulic automatic nut tightening-loosening device [201510095316.8], which is composed of a hydraulic pump station and an actuator. The hydraulic pump station is driven by a motor, and the actuator mainly includes a bidirectional plunger motor, a hydraulic cylinder and a three-jaw chuck. The locking nut is locked by the extension and retraction of the hydraulic cylinder and the three-jaw chuck, and the nut tightening-loosening is realized by the rotary torque of the hydraulic motor.

[0004] The above-mentioned scheme solves the problem that the existing nut pre-tightening force cannot be accurately adjusted to a certain extent by improving the hydraulic circuit, but the scheme still has many deficiencies, such as the conventional hydraulic motor cannot provide sufficient tightening torque. SUMMARY

[0005] The purpose of the present application is to solve the above-mentioned problems, and to provide a large speed reducer bearing locking nut automatic tightening tool with reasonable design and large rotary torque.

[0006] In order to achieve the above object, the following technical scheme is adopted: a large reducer bearing locking nut automatic tightening tool, comprising a hydraulic drive system and a hydraulic motor driven and controlled by the hydraulic drive system, a tightening mechanism is drivingly connected to the output end of the hydraulic motor, the tightening mechanism is internally provided with a variable speed assembly and a clamping assembly drivingly connected with the variable speed assembly. The hydraulic drive system provides torque for the hydraulic motor, and the variable speed assembly realizes variable speed transmission of the clamping assembly, further increases the torque of the tightening mechanism, and provides sufficient tightening torque for the locking nut.

[0007] In the above-mentioned large reducer bearing locking nut automatic tightening tool, the tightening mechanism comprises a base fixedly connected with the hydraulic motor, and the lower end of the base is provided with a coupling assembly. The base is connected with the hydraulic motor, and is used for mounting the variable speed assembly and the clamping assembly, so as to ensure stable transmission of torque to the locking nut.

[0008] In the above-mentioned large reducer bearing locking nut automatic tightening tool, the coupling assembly comprises a coupling cylinder body arranged at the lower end of the base, a coupling step surface is arranged between the circumferential inner side of the coupling cylinder body and the lower end of the base, and a coupling sleeve is sleeved on the circumferential outer side of the coupling cylinder body. A coupling tooth is arranged between the inner side of the coupling sleeve and the outer side of the coupling cylinder body, which is distributed in the circumferential direction and is engaged with the locking. The coupling assembly realizes relative fixation with the reducer, and realizes double locking with the base to ensure the stability of the transmission of the variable speed assembly.

[0009] In the above-mentioned large reducer bearing locking nut automatic tightening tool, the variable speed assembly comprises a variable speed shaft connected with the output end of the hydraulic motor and a planet carrier arranged in the base. The variable speed shaft is rotatably connected with the planet carrier, the sun gear is fixed on the variable speed shaft, a plurality of planet gears are rotatably mounted in the planet carrier through the planet shaft and are in meshing transmission with the sun gear, and the inner ring is rotatably mounted on the planet carrier and surrounds the circumferential direction. The inner ring is in meshing transmission with the planet gear, and the outer side of the inner ring is connected with the clamping assembly. The structure is compact and has high transmission efficiency by using planetary gear transmission, and has large transmission ratio to meet the variable speed transmission demand of the tightening mechanism.

[0010] In the above-mentioned large reducer bearing locking nut automatic tightening tool, the clamping assembly comprises a clamping sleeve arranged on the circumferential outer side of the inner ring. The inner side of the clamping sleeve and the outer side of the inner ring are circumferentially limited by the intermeshing locking teeth. The clamping sleeve is connected with the extension sleeve extending downward relative to the planet carrier through the threaded member. The inner side of the lower end of the extension sleeve is provided with a clamping step surface. The clamping step surface is provided with a clamping tooth on the side opposite to the center axis of the clamping sleeve. The clamping step surface and the clamping tooth are located below the coupling sleeve. The clamping assembly realizes the circumferential limiting of the locking nut by using the clamping sleeve and the clamping tooth, ensures the torque balance of the locking nut in the circumferential direction, and improves the tightening quality.

[0011] In the automatic tightening tool for the bearing locking nut of a large speed reducer, a thrust angular contact bearing is rotatably arranged between the upper end of the variable speed shaft and the base, a roller bearing is rotatably arranged between the lower end of the variable speed shaft and the base, and a sealing pad is arranged between the thrust angular contact bearing and the roller bearing. The thrust angular contact bearing and the roller bearing ensure the lubrication of the rotation of the variable speed shaft, and the thrust angular contact bearing can bear a large axial load when the base rotates downward with the locking nut.

[0012] In the automatic tightening tool for the bearing locking nut of a large speed reducer, the hydraulic drive system comprises a pressure supply assembly, and the pressure supply assembly is connected with the hydraulic motor through a control assembly. The pressure supply assembly provides the hydraulic driving force for the hydraulic motor, and the control assembly controls the rotation direction and start-stop of the hydraulic motor.

[0013] In the automatic tightening tool for the bearing locking nut of a large speed reducer, the pressure supply assembly comprises a first hydraulic pump and a second hydraulic pump which are in communication with an oil tank, the first hydraulic pump and the second hydraulic pump are synchronously driven by a pressure supply motor, the first hydraulic pump and the second hydraulic pump are in communication with a two-position two-way directional valve through an oil supply pipeline, the two-position two-way directional valve is in communication with the control assembly, the two-position two-way directional valve is in communication with the oil tank through an oil return pipeline, a first overflow valve is arranged between the two-position two-way directional valve and the second hydraulic pump, and the first overflow valve is in communication with the oil tank through an overflow pipeline. The pressure supply assembly provides hydraulic oil for the oil supply pipeline through the first hydraulic pump and the second hydraulic pump, the two-position two-way directional valve controls the on-off of the oil supply pipeline where the second hydraulic pump is located, so as to adjust the rotation speed of the hydraulic motor.

[0014] In the automatic tightening tool for the bearing locking nut of a large speed reducer, the control assembly comprises a three-position four-way directional valve which is in communication with the two-position two-way directional valve, a pressure relay and a second overflow valve are arranged between the two-position two-way directional valve and the three-position four-way directional valve, the second overflow valve is in communication with the oil tank through an overflow pipeline, the three-position four-way directional valve is in communication with the hydraulic motor through a circulation pipeline, the three-position four-way directional valve is in communication with the oil tank through an oil return pipeline, and the hydraulic motor is in communication with the oil tank through the oil return pipeline. The three-position four-way directional valve controls the start-stop and forward-reverse rotation of the hydraulic motor, and switches the rotation direction of the clamping assembly according to the needs to realize the installation or dismounting of the locking nut.

[0015] In the automatic tightening tool for the bearing locking nut of a large speed reducer, the first hydraulic pump is a high-pressure 4mL hydraulic pump, the second hydraulic pump is a low-pressure 25mL hydraulic pump, the first overflow valve is a 6Mpa overflow valve, and the second overflow valve is a 31Mpa overflow valve. The first hydraulic pump provides oil for the hydraulic motor alone or jointly with the second hydraulic pump, and the first overflow valve and the second overflow valve maintain the stability of the hydraulic pressure to ensure the stability of the rotation speed of the hydraulic motor.

[0016] In the automatic tightening tool for the bearing locking nut of a large speed reducer, a low-speed motor is selected for the hydraulic motor.

[0017] Compared with the prior art, the hydraulic motor output end controlled by the hydraulic drive system is connected with the speed change assembly and the clamping assembly to provide a large rotary torque for the locking nut. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the application;

[0019] Figure 2 is a working schematic diagram of the tightening mechanism of the application;

[0020] Figure 3 is a structural schematic diagram of the tightening mechanism of the application;

[0021] Figure 4 is a structural schematic diagram of the speed reducer of the application;

[0022] In the figure, hydraulic drive system 1, hydraulic motor 2, tightening mechanism 3, base 31, coupling cylinder 32, coupling step surface 33, coupling sleeve 34, coupling teeth 35, angular contact thrust bearing 36, roller bearing 37, sealing gasket 38, speed change assembly 4, speed change shaft 41, planet carrier 42, sun gear 43, planet shaft 44, planet gear 45, inner ring gear 46, clamping assembly 5, clamping sleeve 51, locking teeth 52, extension sleeve 53, clamping step surface 54, clamping teeth 55, pressure supply assembly 6, first hydraulic pump 61, second hydraulic pump 62, pressure supply motor 63, two-position two-way directional valve 64, oil tank 65, first overflow valve 66, control assembly 7, three-position four-way directional valve 71, pressure relay 72, second overflow valve 73, support shaft 8, locking nut 81, tapered roller bearing 82, winding drum 83, steel wire rope 84. DETAILED DESCRIPTION

[0023] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0024] As Figure 1As shown in the figure, a large reducer bearing locking nut automatic tightening tool, comprising a hydraulic drive system 1 and a hydraulic motor 2 driven and controlled by the hydraulic drive system 1, the output end of the hydraulic motor 2 is drivingly connected with a tightening mechanism 3, the tightening mechanism 3 is internally provided with a variable speed assembly 4 and a clamping assembly 5 drivingly connected with the variable speed assembly 4. As shown in the figure Figure 4 As shown in the figure, the existing reducer comprises a support shaft 8, wherein the upper end of the support shaft 8 is threadedly connected with a locking nut 81, the outer side of the support shaft 8 is rotatably connected with a shaft sleeve through a tapered roller bearing 82, and at the same time, a winding drum 83 and a steel wire rope 84 are installed on the outer side of the reducer for pulling. Figure 2 And Figure 4 As can be seen, the outer side of the hoist reducer is also provided with a winding drum 83 and a steel wire rope 84 for pulling. When assembling the reducer, the locking nut 81 needs to be threadedly connected and fixed with the support shaft 8 by rotating.

[0025] Specifically, the specific structure of the tightening mechanism 3 is as shown in the figure Figures 2-3 As shown in the figure, the base 31 is fixedly attached to the lower end of the hydraulic motor 2, the variable speed assembly 4 is installed inside the base 31, and the tightening mechanism 3 comprises the base 31 fixedly connected with the hydraulic motor 2, and the lower end of the base 31 is provided with a coupling assembly.

[0026] In detail, the coupling assembly comprises a coupling barrel 32 provided at the lower end of the base 31, a coupling step surface 33 is provided between the circumferential inner side of the coupling barrel 32 and the lower end of the base 31, a coupling sleeve 34 is sleeved on the circumferential outer side of the coupling barrel 32, and a coupling tooth 35 is provided between the inner side of the coupling sleeve 34 and the outer side of the coupling barrel 32. The coupling tooth 35 is distributed along the circumference and is engaged and locked. The coupling barrel 32 and the coupling step surface 33 on the inner side thereof are tightly attached to the limiting barrel on the upper end of the support shaft 8 of the reducer to realize the horizontal limiting of the base 31 and the support shaft 8, and at the same time, the coupling sleeve 34 is engaged and locked with the coupling tooth 35 on the circumferential outer side of the upper end of the support shaft 8, thereby realizing the circumferential limiting of the base 31 and the support shaft 8, and the hydraulic motor 2, the base 31 and the support shaft 8 are fixed in the circumferential direction, and the hydraulic motor 2 and the base 31 are lifted relative to the support shaft 8 in the axial direction. The connection state of the hydraulic motor 2 and the base 31 and the coupling assembly with the reducer is as shown in the figure Figure 2 .

[0027] Further, the variable speed assembly 4 comprises a variable speed shaft 41 connected with the output end of the hydraulic motor 2 and a planet carrier 42 arranged in the base 31, the variable speed shaft 41 is rotationally connected with the planet carrier 42, the variable speed shaft 41 is fixed with a sun gear 43, the planet carrier 42 is integrally formed with the base 31 and comprises an upper carrier body and a lower carrier body, the sun gear 43 and a planet gear 45 are arranged between the upper carrier body and the lower carrier body, a plurality of planet gears 45 rotationally arranged in the planet carrier 42 are in meshing transmission with the sun gear 43, the planet carrier 42 is rotationally arranged with an inner ring gear 46 which is circumferentially surrounded, the inner ring gear 46 is in meshing transmission with the planet gear 45, and the outer side of the inner ring gear 46 is connected with the clamping assembly 5. The hydraulic motor 2 is driven by oil pressure to rotate the sun gear 43 counterclockwise, the sun gear 43 drives the planet gear 45 to rotate, and the planet gear 45 is fixed, so that the inner ring gear 46 is driven by the planet gear 45 to rotate counterclockwise.

[0028] Further, the clamping assembly 5 comprises a clamping sleeve 51 arranged on the circumferential outer side of the inner ring gear 46, the inner side of the clamping sleeve 51 is circumferentially limited by the locking teeth 52 on the outer side of the inner ring gear 46, the clamping sleeve 51 is connected with an extension sleeve 53 extending downward relative to the planet carrier 42 by a threaded member, the extension sleeve 53 is connected and fixed with the clamping sleeve 51 by a threaded member, the inner side of the lower end of the extension sleeve 53 is provided with a clamping step surface 54, the clamping step surface 54 is provided with a clamping tooth 55 on the side opposite to the center axis of the clamping sleeve 51, and the clamping step surface 54 and the clamping tooth 55 are located below the coupling sleeve 34. The extension sleeve 53 of the clamping sleeve 51 is arranged circumferentially around the lower carrier body of the planet carrier 42, the clamping step surface 54 at the lower end of the extension sleeve 53 is tightly pressed against the upper end of the locking nut 81, the clamping tooth 55 is in meshing locking with the circumferential outer side of the locking nut 81, and the clamping step surface 54 is located below the coupling sleeve 34 to avoid interference and collision between the coupling sleeve 34 and the locking nut 81.

[0029] The inner ring gear 46 and the clamping sleeve 51 on the circumferential outer side thereof are circumferentially limited by the locking teeth 52, which can withstand larger circumferential torque compared to the threaded member, and if the threaded member is used, the connection part will break due to larger radial shear force. At the same time, the extension sleeve 53 and the clamping sleeve 51 adopt a separate structure, the specifications of the extension sleeve 53, the clamping step surface 54 at the lower end thereof and the clamping tooth 55 can be adjusted as needed to adapt to the assembly requirements of the locking nut 81 of different reducers. The threaded members between the extension sleeve 53 and the clamping sleeve 51 are arranged in central symmetry, and the maximum torque that the extension sleeve 53 can withstand can be adjusted by adjusting the threaded members, and when the torque is too large, the threaded members will break in time to protect the variable speed assembly 4.

[0030] In addition, the upper end of the variable speed shaft 41 is rotatably connected with the base 31 through a thrust angular contact bearing 36, and the lower end of the variable speed shaft 41 is rotatably connected with the base 31 through a roller bearing 37. A sealing pad 38 is arranged between the thrust angular contact bearing 36 and the roller bearing 37. The thrust angular contact bearing 36 is arranged in a bearing mounting groove at the upper end of the base 31, so that the variable speed shaft 41 is rotatably connected with the base 31 and can bear a large axial load. The sealing pad 38 separates the thrust angular contact bearing 36 from the sun gear 43.

[0031] Meanwhile, the hydraulic driving system 1 comprises a pressure supply assembly 6 connected with the hydraulic motor 2 through a control assembly 7. The pressure supply assembly 6 provides hydraulic driving force for the hydraulic motor 2 through an oil circuit, and the control assembly 7 is arranged between the pressure supply assembly 6 and the hydraulic motor 2 to control the opening and closing of the oil circuit and the flow direction of the hydraulic oil.

[0032] As can be seen, the pressure supply assembly 6 comprises a first hydraulic pump 61 and a second hydraulic pump 62 connected with an oil tank 65. The first hydraulic pump 61 and the second hydraulic pump 62 are synchronously driven by a pressure supply motor 63. The first hydraulic pump 61 and the second hydraulic pump 62 are connected with a two-position two-way directional valve 64 through an oil supply pipeline. The two-position two-way directional valve 64 is connected with the control assembly 7 and connected with the oil tank 65 through an oil return pipeline. A first overflow valve 66 is arranged between the two-position two-way directional valve 64 and the second hydraulic pump 62, and the first overflow valve 66 is connected with the oil tank 65 through an oil overflow pipeline. The first hydraulic pump 61 and the second hydraulic pump 62 guide the hydraulic oil in the oil tank 65 into the oil supply pipeline, and then flow through the two-position two-way directional valve 64 and a three-position four-way directional valve 71 to enter the hydraulic motor 2. The first overflow valve 66 and a second overflow valve 73 maintain the stability of the pressure in the oil supply pipeline, and the oil circuit is realized through the oil overflow pipeline and the oil return pipeline.

[0033] From Figure 1 It can be seen that the two-position two-way directional valve 64 realizes the interruption of the oil supply pipeline of the second hydraulic pump 62, the first hydraulic pump 61 supplies oil alone, and drives the hydraulic motor 2 to rotate at low speed, ensuring the stability of the installation of the locking nut 81. When the locking nut 81 is completely screwed into the upper end of the support shaft 8, the two-position two-way directional valve 64 controls the oil supply pipeline of the second hydraulic pump 62 to be connected, so as to improve the torque of the hydraulic motor 2 and apply a certain pre-tightening force to the locking nut 81.

[0034] Clearly, control component 7 includes a three-position four-way directional valve 71 connected to a two-position two-way directional valve 64. A pressure relay 72 and a second relief valve 73 are provided between the two-position two-way directional valve 64 and the three-position four-way directional valve 71. The second relief valve 73 is connected to the oil tank 65 through an relief line. The three-position four-way directional valve 71 is connected to the hydraulic motor 2 through a circulation line and to the oil tank 65 through a return line. The hydraulic motor 2 is also connected to the oil tank 65 through a return line. In normal operation, the three-position four-way directional valve 71 connects the supply line and the circulation line, thereby driving the hydraulic motor 2 to rotate. When the three-position four-way directional valve 71 switches its position, it connects the supply line and the relief line, keeping the circulation line closed, causing the hydraulic motor 2 to stop rotating. The return line guides the residual hydraulic oil in the hydraulic motor 2 back to the oil tank 65.

[0035] Preferably, the first hydraulic pump 61 is a high-pressure 4mL hydraulic pump, the second hydraulic pump 62 is a low-pressure 25mL hydraulic pump, the first relief valve 66 is a 6MPa relief valve, and the second relief valve 73 is a 31MPa relief valve; the hydraulic motor 2 is a low-speed motor. The high-pressure 4mL hydraulic pump drives the hydraulic motor 2 to maintain a low-speed, high-torque state. When the locking thread is fully connected to the support shaft 8, it encounters significant resistance. At this time, the low-pressure 25mL hydraulic pump increases the hydraulic oil flow rate, applying additional feed torque to the hydraulic motor 2. Simultaneously, the first relief valve 66 and the second relief valve 73 discharge excess oil, achieving internal pressure balance in the oil supply line and preventing impact pressure from damaging the hydraulic drive system 1.

[0036] The overall hydraulic principle is as follows: Figure 1 As shown, after the pressure supply motor 63 is energized, it drives the first hydraulic pump 61 and the second hydraulic pump 62. The second hydraulic pump 62 draws oil from the oil tank 65 and outputs pressure to the two-position two-way directional valve 64. The two-position two-way directional valve 64 is in the normally open state, and the hydraulic oil reaches the three-position four-way directional valve 71 through the two-position two-way directional valve 64. At the same time, the first hydraulic pump 61 draws oil from the oil tank 65 and outputs pressurized oil to the three-position four-way directional valve 71. At this time, the combined flow of the two pumps is at its maximum. When the control switch is manually rotated, the PA port of the three-position four-way directional valve 71 is opened, and the hydraulic oil reaches the A port of the hydraulic motor 2. The hydraulic motor 2 rotates clockwise, driving the transmission assembly 4 and the clamping assembly 5 to rotate clockwise at a higher speed. When the load increases, the system pressure rises and reaches the set value of 3 MPa of the pressure relay 72. The two-position two-way directional valve 64 is energized and reverses, and the second hydraulic pump 62 connects to the oil tank 65 to release pressure. Only the first hydraulic pump 61 continues to supply pressurized oil, raising the pressure to 25 MPa to complete the nut tightening process. This system automatically adjusts the flow and pressure based on the tightening pattern of the nut, starting with a fast and then slowing down, and using a small torque initially followed by a large torque, without increasing the power output of the pressure supply motor 63. This achieves both speed and energy efficiency.

[0037] Example 1

[0038] like Figures 1-2 As shown, the hydraulic drive system 1 drives the hydraulic motor 2 to output torque, and the speed change component 4 realizes the speed change transmission of the clamping component 5. At the same time, the hydraulic motor 2 and the tightening mechanism 3 descend slowly and synchronously, and slowly screw the locking nut 81 into the threaded mounting seat on the outer side of the upper end of the support shaft 8, thereby axially limiting the tapered roller bearing 82.

[0039] Pressure relay 72 senses the oil pressure inside the oil supply line. When the oil pressure reaches the preset threshold, pressure relay 72 sends an electrical signal. Since the two-position two-way directional valve 64 and the three-position four-way directional valve 71 are electromagnetically controlled, they can respond in time to realize the switching of the passage. When the oil pressure is too high, the switching passage is connected by the second hydraulic pump 62 to the oil tank 65 to release the pressure, and the first hydraulic pump 61 continuously supplies pressure oil to maintain the constant oil pressure inside the oil supply line.

[0040] Example 2

[0041] The structure, principle and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is that in this embodiment, the hydraulic motor 2 drives the speed change assembly 4 and the clamping assembly 5 to reverse transmission under the action of the hydraulic drive system 1. The hydraulic motor 2 and the base 31 slowly rise, and the locking nut 81 is unscrewed from the upper end of the support shaft 8.

[0042] Specifically, the three-position four-way directional valve 71 switches its internal passage, changing the connection status of the oil supply line, overflow line and circulation line connected to it. The hydraulic pressure inside the circulation line rotates in the reverse direction, thereby driving the hydraulic motor 2 to rotate in the reverse direction. At this time, the hydraulic motor 2 and the base 31 slowly rise under the action of the external lifting mechanism. At the same time, the clamping sleeve 51 rotates in the reverse direction, driving the locking nut 81 to unscrew from the upper end of the support shaft 8.

[0043] Example 3

[0044] The structure, principle, and implementation steps of this embodiment are similar to those of Embodiment 2. The difference lies in that, in this embodiment, the three-position four-way directional valve 71 in the hydraulic drive system 1 switches its internal passage, connecting the oil supply line with the return line of the three-position four-way directional valve 71. The circulation line connected to the hydraulic motor 2 is closed, and excess oil in the circulation line and the hydraulic motor 2 is guided into the oil tank through the return line connected to the hydraulic motor 2. At this time, the hydraulic motor 2 stops rotating, while the oil in the oil supply line flows normally, and the pressure is maintained stable by the first relief valve 66 and the second relief valve 73, facilitating rapid response oil supply when the three-position four-way directional valve 71 switches its passage.

[0045] The first hydraulic pump 61 and the second hydraulic pump 62 in the hydraulic drive system 1 are normally kept in a standby state, and the internal passage of the two-position two-way directional valve 64 is switched to directly connect the oil supply line connected to the second hydraulic pump 62 with the oil return line, so that the internal oil circulation is maintained by the first hydraulic pump 61.

[0046] In summary, the principle of the embodiment is that the hydraulic drive system 1 provides rotational driving force for the hydraulic motor 2, drives the hydraulic motor 2 to rotate in forward and reverse directions, and the variable speed assembly 4 connected to the output end of the hydraulic motor 2 changes the speed of transmission, further improves the rotational torque of the clamping assembly 5, and the clamping assembly 5 is limited in the circumferential direction by the locking nut 81 on the speed reducer. With the rotation of the clamping assembly 5, the locking nut 81 is screwed onto the speed reducer and a certain pre-tightening force is applied, or the locking nut 81 is unscrewed to facilitate the disassembly of the tapered roller bearing 82 on the speed reducer.

[0047] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art to which the present application pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0048] Although the terms hydraulic drive system 1, hydraulic motor 2, tightening mechanism 3, base 31, coupling cylinder 32, coupling step surface 33, coupling sleeve 34, coupling teeth 35, angular contact thrust bearing 36, roller bearing 37, sealing gasket 38, variable speed assembly 4, variable speed shaft 41, planet carrier 42, sun gear 43, planet shaft 44, planet gear 45, inner ring gear 46, clamping assembly 5, clamping sleeve 51, locking teeth 52, extension sleeve 53, clamping step surface 54, clamping teeth 55, pressure supply assembly 6, first hydraulic pump 61, second hydraulic pump 62, pressure supply motor 63, two-position two-way directional valve 64, oil tank 65, first overflow valve 66, control assembly 7, three-position four-way directional valve 71, pressure relay 72, second overflow valve 73, support shaft 8, locking nut 81, tapered roller bearing 82, etc. are used more frequently in this document, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any interpretation of them as additional limitations is contrary to the spirit of the present application.

Claims

1. A large reducer bearing locking nut automatic tightening tool, comprising a hydraulic drive system (1) and a hydraulic motor (2) driven and controlled by the hydraulic drive system (1), characterized in that, The hydraulic motor (2) output end transmission connection has a tightening mechanism (3), the tightening mechanism (3) built-in transmission assembly (4) and with transmission assembly (4) transmission connection clamping assembly (5); the tightening mechanism (3) includes with hydraulic motor (2) connection fixed base (31), the base (31) lower end is provided with a coupling assembly; the coupling assembly includes the coupling barrel (32) arranged on the lower end of the base (31), the coupling barrel (32) circumferential inner side and the lower end of the base (31) between the coupling step surface (33) is arranged, the coupling barrel (32) circumferential outside is sleeved with the coupling sleeve (34), the coupling sleeve (34) inner side and the outer side of the coupling barrel (32) between the coupling tooth (35) is arranged along the circumferential distribution and engagement locking; the hydraulic motor (2) selects the low speed motor.

2. The automatic tightening tool for locking nuts of large-scale speed reducer bearings according to claim 1, characterized in that, The transmission assembly (4) includes a transmission shaft (41) connected to the output end of the hydraulic motor (2) and a planet carrier (42) arranged in the base (31), the transmission shaft (41) is rotatably connected to the planet carrier (42), the transmission shaft (41) is fixed with a sun gear (43), the planet carrier (42) is rotatably mounted with a plurality of planetary gears (45) engaged with the sun gear (43) through a planet shaft (44), the planet carrier (42) is rotatably mounted with an inner ring gear (46) surrounding circumferentially, the inner ring gear (46) is engaged with the planetary gear (45), and the outer side of the inner ring gear (46) is connected with the clamping assembly (5).

3. The automatic tightening tool for locking nuts of large-scale speed reducer bearings according to claim 2, characterized in that, The clamping assembly (5) includes a clamping sleeve (51) arranged on the outer side of the inner ring gear (46), the inner side of the clamping sleeve (51) and the outer side of the inner ring gear (46) are circumferentially limited by the locking teeth (52) engaged with each other, the clamping sleeve (51) is connected with an extension sleeve (53) extending downward relative to the planet carrier (42) through a threaded member, the inner side of the lower end of the extension sleeve (53) is provided with a clamping step surface (54), the clamping step surface (54) is provided with a clamping tooth (55) on the side opposite to the central axis of the clamping sleeve (51), and the clamping step surface (54) and the clamping tooth (55) are located below the coupling sleeve (34); the transmission shaft (41) is rotatably mounted with a thrust angular contact bearing (36) between the upper end and the base (31), the transmission shaft (41) is rotatably mounted with a roller bearing (37) between the lower end and the base (31), and the transmission shaft (41) is provided with a sealing gasket (38) between the thrust angular contact bearing (36) and the roller bearing (37).

4. The automatic tightening tool for locking nuts of large speed reducer bearing shaft according to claim 1, characterized in that, The hydraulic drive system (1) includes a pressure supply assembly (6), and the pressure supply assembly (6) is connected with the hydraulic motor (2) through a control assembly (7).

5. The automatic tightening tool for locking nuts of large speed reducer shaft bearings according to claim 4, characterized in that, The pressure supply assembly (6) comprises a first hydraulic pump (61) and a second hydraulic pump (62) in communication with an oil tank (65), the first hydraulic pump (61) and the second hydraulic pump (62) are synchronously driven by a pressure supply motor (63), the first hydraulic pump (61) and the second hydraulic pump (62) are in communication with a two-position two-way directional valve (64) through an oil supply pipeline, the two-position two-way directional valve (64) is in communication with a control assembly (7), the two-position two-way directional valve (64) is in communication with the oil tank (65) through an oil return pipeline, and the two-position two-way directional valve (64) is provided with a first overflow valve (66) between the second hydraulic pump (62) and the two-position two-way directional valve (64), and the first overflow valve (66) is in communication with the oil tank (65) through an oil overflow pipeline.

6. The automatic tightening tool for locking nuts of large speed reducer bearing shaft according to claim 5, characterized in that, The control assembly (7) comprises a three-position four-way directional valve (71) in communication with the two-position two-way directional valve (64), a pressure relay (72) and a second overflow valve (73) are arranged between the two-position two-way directional valve (64) and the three-position four-way directional valve (71), the second overflow valve (73) is in communication with the oil tank (65) through an overflow pipeline, the three-position four-way directional valve (71) is in communication with the hydraulic motor (2) through a circulating pipeline, the three-position four-way directional valve (71) is in communication with the oil tank (65) through an oil return pipeline, and the hydraulic motor (2) is in communication with the oil tank (65) through an oil return pipeline.

7. The automatic tightening tool for locking nuts of large speed reducer bearing shaft according to claim 6, characterized in that, The first hydraulic pump (61) is a high-pressure 4mL hydraulic pump, the second hydraulic pump (62) is a low-pressure 25mL hydraulic pump, the first overflow valve (66) is a 6Mpa overflow valve, and the second overflow valve (73) is a 31Mpa overflow valve.

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