Hoisting speed reducer of tower crane

Abstract

The utility model relates to the technical field of speed reducers, in particular to a tower crane lifting speed reducer which comprises a shell, a supporting frame and a transmission shaft which are coaxially arranged, the transmission shaft comprises an input shaft and an output shaft, the input shaft and the output shaft are connected through an elastic coupler, the output shaft is connected with a sun wheel set and a planet wheel set which are located in the shell, and the sun wheel set and the planet wheel set are arranged in the shell. A first bearing assembly close to the elastic coupling is arranged between the supporting frame and the shell, an oil seal assembly located on the outer side of the first bearing assembly and the outer side of the shell is further arranged on the side, away from the elastic coupling, of the supporting frame, the elastic coupling is a plum coupling, and the sun gear set comprises a first-stage sun gear and a second-stage sun gear. The planet wheel set further comprises a first-stage planet wheel and a second-stage planet wheel, and a planet carrier is arranged between the first-stage planet wheel and the second-stage planet wheel. According to the scheme, torque and rotating speed can be transmitted through the plum coupling, impact on the interior of the speed reducer at the moment of starting and stopping of the three-phase asynchronous motor can be effectively buffered, and meanwhile disassembly is convenient, supporting stability is good, and sealing performance is good.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reducers, and specifically provides a tower crane hoisting speed reducer. Background Art

[0002] A tower crane is a type of lifting equipment commonly used on construction sites, also called a tower crane. It is mainly used to lift construction materials such as steel bars, wooden planks, scaffolding pipes, etc. Tower cranes are essential equipment in construction. When a tower crane is in operation, it is generally necessary to use a tower crane lifting mechanism to complete the lifting operation of the installed parts. The lifting mechanism is driven by a lifting motor, and the lifting motor needs to be decelerated by a lifting reducer before connecting to other mechanisms. In the prior art, the following patents involve reducers or other reducers for tower cranes:

[0003] 1. The utility model patent with patent number "202223443900.2" and patent name "A tower crane slewing reducer" includes an output shaft, a rear housing, a middle housing, a front housing, a spherical roller bearing, an output shaft support bearing, a three-stage star gear, a three-stage planetary shaft, a three-stage planetary carrier, a three-stage planetary gear, a second-stage star gear, a second-stage planetary gear, a second-stage planetary shaft, a second-stage planetary carrier, a first-stage planetary shaft, a first-stage planetary gear, a first-stage planetary carrier, etc. The tower crane reducer can improve the transmission efficiency and reduce the volume of the reducer.

[0004] 2. The invention patent application with the patent number "202010905265.1" and the patent name "A connection method for a lifting reducer of a metallurgical crane" includes a first reducer, an upper shell, a breather, an input shaft, an output shaft, a lifting drum, a drum coupling, etc. This scheme uses a drum coupling to replace the traditional connection method of two reducers requiring two couplings, floating shafts, etc., which can avoid the problems of excessive spacing between the two reducers, increased trolley gauge, increased trolley end beam, and waste of steel and space.

[0005] The existing technology can improve transmission efficiency, increase transmission ratio, and save space, but there are the following problems: 1. The input shaft and the reducer drive shaft are mostly directly connected. The high-speed terminal drive shaft is input from the motor, and then planetary reduction is directly used. When the motor starts and stops, the impact on the inside of the reducer is relatively large, which will seriously affect the service life of the reducer; 2. Comparative Document 2 uses a coupling transition connection, but it is a drum coupling and is mainly used to solve the problem of using two couplings between two reducers. It is difficult to meet the use requirements of tower crane lifting reducers.

[0006] In summary, how to design a tower crane lifting reducer that has a small impact load during starting or braking, is highly practical, easy to use and has a long service life is a problem that needs to be solved urgently. Utility Model Content

[0007] In order to solve the above problems, the utility model provides a tower crane lifting reducer, which can reduce the load impact during starting or braking, reduce the internal impact on the reducer, is easy to disassemble and use, and has a long service life.

[0008] The utility model provides a tower crane lifting reducer, comprising a coaxially arranged shell, a support frame and a transmission shaft, wherein the transmission shaft is located inside the shell and the support frame; the transmission shaft comprises an input shaft and an output shaft, and the input shaft and the output shaft are connected by an elastic coupling; the output shaft is connected to a sun gear set and a planetary gear set located inside the shell, a bearing assembly close to the elastic coupling is provided between the support frame and the shell, and an oil seal assembly located outside the bearing assembly and the shell is also provided on the side of the support frame away from the elastic coupling.

[0009] Furthermore, the elastic coupling adopts a plum blossom coupling.

[0010] Furthermore, the output shaft includes an internal spline, the sun gear set includes a primary sun gear spline-connected to the output shaft, and the planetary gear set includes a primary planetary gear meshed with the primary sun gear.

[0011] Furthermore, the sun gear set also includes a secondary sun gear sleeved on the primary sun gear, and the planetary gear set also includes a secondary planetary gear meshed with the secondary sun gear.

[0012] Furthermore, a planet carrier is provided between the first-stage planetary gear and the second-stage planetary gear, and the planet carrier is fixedly connected to the first-stage planetary gear and connected to the second-stage sun gear.

[0013] Furthermore, the support frame includes an inner annular frame located between the first bearing assembly and the input shaft, and one end of the inner annular frame close to the input shaft is provided with a support column connected to the secondary planetary gear.

[0014] Furthermore, the number of the support columns is matched with the number of the secondary planetary gears, the support columns extend into the secondary planetary gears, and the support columns are connected to the inner wall of the secondary planetary gears by a second bearing assembly.

[0015] Furthermore, the support frame includes a connecting platform and a receiving platform located between the connecting platform and the inner annular frame, and the outer diameters of the connecting platform, the receiving platform and the inner annular frame are successively reduced; the oil seal assembly includes an oil seal body connected to the receiving platform and an oil seal seat is provided on the oil seal body.

[0016] Further, the housing includes a fastening platform connected to the oil seal seat.

[0017] Furthermore, the bearing assembly 1 adopts a double-row deep groove ball bearing.

[0018] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0019] 1. In this scheme, the input high-speed end is connected through an elastic coupling, which is then connected to the internal transmission shaft of the reducer. The output low-speed end adopts a planetary structure reducer. The motor shaft and the reducer input shaft can be connected through an elastic plum blossom coupling. The torque and speed are transmitted through the plum blossom coupling, which can effectively buffer the internal impact of the three-phase asynchronous motor on the reducer at the moment of starting and stopping, and can improve the stability and service life of use. At the same time, according to the special characteristics of the plum blossom elastomer itself, a certain angle deviation can be allowed during installation, which can effectively accommodate the coaxiality error between the lifting mechanism frame and the drum.

[0020] 2. This solution uses double-row deep groove ball bearings as the supporting structure to ensure smooth operation. At the same time, the oil seal assembly can meet the sealing performance of the skeleton oil seal.

[0021] 3. The traditional reducer spline pair has no lubrication measures and can only rely on natural cooling, which will reduce the service life of the transmission pair. This solution immerses the transmission pair in the lubricating oil of the reducer, which can take away the heat generated during operation and increase the overall service life of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a reducer provided according to an embodiment of the utility model;

[0023] Figure 2 It is a front view structural schematic diagram of a reducer provided according to an embodiment of the utility model;

[0024] Figure 3 yes Figure 2 Sectional view in the AA direction;

[0025] Figure 4 It is a partial structural schematic diagram of a reducer provided according to an embodiment of the utility model (the housing and the bearing assembly are not shown);

[0026] Figure 5 It is a schematic diagram of the exploded structure of a reducer provided according to an embodiment of the utility model.

[0027] The reference numerals therein include: housing 1, support frame 2, input shaft 3, output shaft 4, elastic coupling 5, bearing assembly 1 6, primary sun gear 7, primary planetary gear 8, secondary sun gear 9, secondary planetary gear 10, planetary carrier 11, inner annular frame 12, support column 13, accommodating platform 14, connecting platform 15, oil seal body 16, oil seal seat 17, and fastening platform 18. DETAILED DESCRIPTION

[0028] In the following, reference will be made to the Figure 1-5Describe the embodiment of the utility model. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following Figure 1-5 It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation on the present invention.

[0030] A tower crane lifting reducer comprises a coaxially arranged shell 1, a support frame 2 and a transmission shaft, wherein the transmission shaft is located inside the shell 1 and the support frame 2, and the transmission shaft comprises an input shaft 3 and an output shaft 4, wherein the input shaft 3 is connected to the power output end of a three-phase asynchronous motor, and the input shaft 3 and the output shaft 4 are connected by an elastic coupling 5, wherein the elastic coupling 5 adopts a plum blossom coupling, through which torque and rotation speed are transmitted to buffer the impact of the three-phase asynchronous motor on the reducer when it is started and stopped. Meanwhile, the plum blossom coupling can allow a certain angle deviation during installation, and can effectively accommodate the coaxiality error between the frame and the drum of the tower crane lifting mechanism.

[0031] like Figure 3-5 As shown, the output shaft 4 is connected to a sun gear set and a planetary gear set located in the housing 1, the output shaft 4 includes an internal spline, the sun gear set includes a primary sun gear 7 splined to the output shaft 4, the planetary gear set includes a primary planetary gear 8 meshed with the primary sun gear 7, the sun gear set also includes a secondary sun gear 9 sleeved on the primary sun gear 7, the planetary gear set also includes a secondary planetary gear 10 meshed with the secondary sun gear 9, a planet carrier 11 is provided between the primary planetary gear 8 and the secondary planetary gear 10, the planet carrier 11 is fixedly connected to the primary planetary gear 8 and connected to the secondary sun gear 9.

[0032] like Figure 5 As shown, the left end of the primary sun gear 7 includes an external spline and is connected to the output shaft 4 through the external spline, which can facilitate the daily maintenance of the reducer. When the traditional reducer leaks oil, the reducer assembly needs to be replaced. In this solution, the reducer assembly does not need to be replaced, and the output shaft 4 can be replaced. The right end of the primary sun gear 7 includes meshing teeth and meshes with the primary planetary gear 8 through the meshing teeth. The secondary sun gear 9 is sleeved on the middle of the primary sun gear 7. At the same time, in this embodiment, the transmission pairs such as the planetary gear set and the sun gear set are immersed in the shell, and the heat generated during the operation can be taken away by designing a circulated oil channel.

[0033] A bearing assembly 6 close to the elastic coupling 5 is provided between the support frame 2 and the housing 1. The bearing assembly 6 adopts a double-row deep groove ball bearing, which can ensure the stability of the overall operation of the reducer. Figure 5 As shown, the support frame 2 includes an inner annular frame 12 located between the bearing assembly 16 and the input shaft 3. The inner annular frame 12 is provided with a support column 13 connected to the secondary planetary gear 10 at one end close to the input shaft 3. The number of the support columns 13 matches the number of the secondary planetary gears 10. The support columns 13 extend into the secondary planetary gears 10 and the support columns 13 are connected to the inner wall of the secondary planetary gears 10 by the bearing assembly 2. The support frame 2 includes a connecting platform 15 and a receiving platform 14 located between the connecting platform 15 and the inner annular frame 12. The outer diameters of the connecting platform 15, the receiving platform 14 and the inner annular frame 12 are successively reduced. The side of the support frame 2 away from the elastic coupling 5 is also provided with an oil seal assembly located outside the bearing assembly 16 and the housing 1. The oil seal assembly includes an oil seal body 16 connected to the receiving platform 14. The oil seal body 16 is provided with an oil seal seat 17. The sealing performance of the skeleton oil seal can be met by the oil seal body 16 and the oil seal seat 17. The housing 1 includes a fastening platform 18 connected to the oil seal seat 17.

[0034] When in use, the motor drives the input shaft 3, the elastic coupling 5 and the output shaft 4 to move, the output shaft 4 drives the first-stage sun gear 7 to move, the first-stage sun gear 7 drives the first-stage planetary gear 8, the planetary carrier 11, the second-stage sun gear 9 and the second-stage planetary gear 10 to move in turn, and the support frame 2, the housing 1, etc. also move accordingly.

[0035] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0036] The above specific implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A tower crane lifting reducer, characterized in that: The invention comprises a coaxially arranged housing (1), a support frame (2) and a transmission shaft, wherein the transmission shaft is located inside the housing (1) and the support frame (2); the transmission shaft comprises an input shaft (3) and an output shaft (4), and the input shaft (3) and the output shaft (4) are connected by an elastic coupling (5); the output shaft (4) is connected to a sun gear set and a planetary gear set located inside the housing (1); a bearing assembly (6) close to the elastic coupling (5) is provided between the support frame (2) and the housing (1); and an oil seal assembly located outside the bearing assembly (6) and the housing (1) is also provided on a side of the support frame (2) away from the elastic coupling (5).

2. The tower crane lifting reducer according to claim 1, characterized in that: The elastic coupling (5) is a plum blossom coupling.

3. The tower crane lifting reducer according to claim 2, characterized in that: The output shaft (4) comprises an internal spline, the sun gear set comprises a primary sun gear (7) spline-connected to the output shaft (4), and the planetary gear set comprises a primary planetary gear (8) meshed with the primary sun gear (7).

4. The tower crane lifting reducer according to claim 3, characterized in that: The sun gear set further comprises a secondary sun gear (9) sleeved on the primary sun gear (7), and the planetary gear set further comprises a secondary planetary gear (10) meshing with the secondary sun gear (9).

5. The tower crane lifting reducer according to claim 4, characterized in that: A planet carrier (11) is provided between the first-stage planetary gear (8) and the second-stage planetary gear (10), and the planet carrier (11) is fixedly connected to the first-stage planetary gear (8) and connected to the second-stage sun gear (9).

6. The tower crane lifting reducer according to claim 5, characterized in that: The support frame (2) comprises an inner annular frame (12) located between the first bearing assembly (6) and the input shaft (3); an end of the inner annular frame (12) close to the input shaft (3) is provided with a support column (13) connected to the secondary planetary gear (10).

7. The tower crane lifting reducer according to claim 6, characterized in that: The number of the support columns (13) is arranged to match the number of the secondary planetary gears (10); the support columns (13) extend into the secondary planetary gears (10), and the support columns (13) and the inner wall of the secondary planetary gears (10) are connected by a second bearing assembly.

8. The tower crane lifting reducer according to claim 7, characterized in that: The support frame (2) comprises a connecting platform (15) and a receiving platform (14) located between the connecting platform (15) and the inner annular frame (12), wherein the outer diameters of the connecting platform (15), the receiving platform (14) and the inner annular frame (12) decrease in sequence; and the oil seal assembly comprises an oil seal body (16) connected to the receiving platform (14), and an oil seal seat (17) is provided on the oil seal body (16).

9. The tower crane lifting reducer according to claim 8, characterized in that: The housing (1) comprises a fastening platform (18) connected to the oil seal seat (17).

10. The tower crane lifting reducer according to claim 9, characterized in that: The bearing assembly 1 (6) adopts a double-row deep groove ball bearing.

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