Reduction gear box of gear and rack lifting device

Abstract

The utility model relates to the technical field of gear boxes, in particular to a reduction gear box of a gear rack lifting device, which comprises a box body and a mounting shell arranged on one side of the box body, the output shaft is rotationally connected to the end, close to the mounting shell, of the box body, the output shaft is rotationally connected with the box body through a first bearing, the output shaft is rotationally connected with the mounting shell through a second bearing, a gear in the lifting device is arranged on the output shaft, and the gear in the lifting device is located between the box body and the mounting shell; the input shaft is arranged at one end, far away from the input shaft, of the box body; the brake mechanism is arranged at one end, far away from the mounting shell, of the box body and connected with the input shaft; and the speed reducing mechanism is arranged in the box body, and the speed reducing mechanism is used for realizing speed reducing transmission between the input shaft and the output shaft. The bearings are installed on the two sides of the driving gear and share the stress of the output shaft, so that the type selection size of the bearings is reduced, the safety coefficient is increased in a limited space, and the service life is prolonged in the limited space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear box, in particular to a reduction gear box of rack and pinion lifting device. BACKGROUND

[0002] In the trestle construction project, the lifting platform as the key high-altitude operation equipment, its stability and reliability directly affect the construction safety and efficiency. The existing lifting platform generally adopts gear and rack driving structure, and the lifting movement is realized by the meshing of the motor driven gear and the rack. However, the core transmission component of this structure, the gear output shaft structure, is mostly supported by single bearing, and the output gear is cantilevered under stress, and the bearing near the gear bears a large stress, so that in the heavy load environment, the selection of the bearing in this structure is very large, thereby causing the driving structure of the lifting device to be heavy and the service life to be short. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to solve one of the problems in the background art.

[0004] To this end, the utility model provides a reduction gear box of rack and pinion lifting device.

[0005] The utility model solves the technical problems by adopting the technical scheme of:

[0006] A reduction gear box of rack and pinion lifting device, comprising

[0007] A box body and a mounting shell arranged on one side of the box body;

[0008] An output shaft, one end of the output shaft being rotatably connected to the box body near the mounting shell, the output shaft being rotatably connected to the box body and the mounting shell through a first bearing and a second bearing respectively, the gear in the lifting device being arranged on the output shaft, and the gear in the lifting device being located between the box body and the mounting shell;

[0009] An input shaft, the input shaft being arranged at one end of the box body away from the input shaft;

[0010] A brake mechanism, the brake mechanism being arranged at one end of the box body away from the mounting shell and being connected to the input shaft;

[0011] A reduction mechanism, the reduction mechanism being arranged in the box body, and the reduction mechanism being used for realizing the speed reduction transmission between the input shaft and the output shaft.

[0012] Further, the box is provided with a mounting hole through which the output shaft penetrates, the first bearing is arranged between the mounting hole inner circle and the output shaft, the mounting hole is provided with a limiting step close to the inside of the box, the end of the box is provided with a gland, the first gland is provided with a first boss, the first boss is inserted into the mounting hole, and the limiting step and the first boss abut the two sides opposite to the first bearing respectively.

[0013] Further, the second bearing is arranged in the mounting shell, the mounting shell is provided with a second gland towards the side of the box, the second gland is provided with a second boss, the second boss is inserted into the mounting shell, the other side of the mounting shell is provided with a top cover, the top cover is provided with a third boss, the third boss is inserted into the mounting shell, and the second boss and the third boss abut the two sides opposite to the second bearing respectively.

[0014] Further, the mounting shell is provided with a fixing bolt, the fixing bolt penetrates the top cover, the mounting shell and is connected with the second gland.

[0015] Further, the first bearing and the second bearing are both large-clearance self-aligning roller bearings.

[0016] Further, the output shaft is provided with a through hole, and a torque sensing device is arranged in the through hole.

[0017] Further, the brake mechanism comprises a brake shell and a brake device integratedly arranged in the brake shell, and the brake shell is arranged at the end of the box.

[0018] The beneficial effects of the utility model are that bearings are arranged on both sides of the driving gear, the double-side bearings share the stress of the output shaft, so that, under the same use condition, compared with the scheme that the bearings are arranged on one side, the structure bearing is smaller in selection, so that the overall structure is smaller, cost can be saved, and the safety factor and service life can be improved in limited space. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described below in combination with the drawings and embodiments.

[0020] Figure 1 is the structural schematic view of the reduction gear box of the rack and pinion lifting device in the utility model.

[0021] Figure 2 is the A part enlarged view of the output shaft mounting structure in Figure 1 the utility model.

[0022] In the figure: 1, box; 11, first gland; 12, mounting hole; 13, limiting step; 14, first boss; 2, output shaft; 21, drive gear; 22, first bearing; 23, second bearing; 3, input shaft; 4, first transmission group; 41, first transmission shaft; 42, first planet carrier; 43, first planetary gear; 44, first sun gear; 45, first housing; 5, second transmission group; 51, second transmission shaft; 52, second planet carrier; 53, second planetary gear; 54, second sun gear; 55, second housing; 6, third transmission group; 61, third transmission shaft; 62, third planet carrier; 63, third planetary gear; 64, third sun gear; 65, third housing; 7, needle baffle; 8, brake mechanism; 81, brake shell; 9, mounting shell; 91, second gland; 92, top cover; 93, second boss; 94, third boss. DETAILED DESCRIPTION

[0023] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic manner, so they only show the structure related to the utility model.

[0024] In the description of the utility model, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the features limited as "first" and "second" can be explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the utility model, it is to be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] The application discloses a reduction gear box of a rack and pinion lifting device, which comprises a box body 1, an output shaft 2, a reduction mechanism, a brake mechanism 8 and an input shaft 3, wherein the brake mechanism 8 is arranged at one end of the box body 1, the input shaft 3 is connected with the brake mechanism 8, the brake mechanism 8 is connected with the reduction mechanism, the reduction mechanism is arranged in the box body 1, the output shaft 2 is connected with the reduction mechanism, the input shaft 3 is connected with an external driving mechanism to input a power source, and the brake mechanism 8 and the reduction mechanism drive the output shaft 2 to rotate.

[0027] One end of the box body 1 is connected with the brake mechanism 8, one end of the box body 1 connected with the brake mechanism 8 is defined as an input end, and the other end is defined as an output end. Specifically, the brake mechanism 8 comprises a brake shell 81 and a brake device arranged in the brake shell 81, the brake shell 81 is arranged at the end of the box body 1, the input shaft 3 penetrates through the brake shell 81, the brake device is connected with the input shaft 3 and is used for emergency braking. The brake device can be a centrifugal brake device, and other brake structures can also be adopted in other embodiments, so that the brake mechanism 8 is arranged at one end of the box body 1 in an integrated structure, thereby facilitating equipment maintenance and part replacement and maintenance.

[0028] The output shaft 2 is rotatably connected to the end of the box body 1 away from the brake mechanism 8 through a first bearing 22, the output shaft 2 is coaxially arranged with the input shaft 3, the box body 1 is provided with a mounting hole 12 through which the output shaft 2 penetrates, the first bearing 22 is arranged between the inner circle of the mounting hole 12 and the output shaft 2, the end of the box body 1 is provided with a first gland 11, the output shaft 2 penetrates through the first gland 11 and is sealed between the first gland 11 through a sealing ring, and the output shaft 2 is rotatably connected with the first gland 11. The side of the mounting hole 12 close to the inside of the box body 1 is provided with a limiting step 13, the first gland 11 is provided with a first boss 14, the first boss 14 is inserted into the mounting hole 12, and the limiting step 13 and the first boss 14 are respectively abutted with the two sides of the first bearing 22, so as to limit the axial position of the first bearing 22.

[0029] The output end side of the box body 1 is provided with a mounting shell 9, the mounting shell 9 is arranged in a spaced manner with the box body 1, the mounting shell 9 is installed at the mounting position of the reduction gear box, the output shaft 2 is inserted into the mounting shell 9 at the end away from the box body 1, and is rotationally connected with the mounting shell 9 through the second bearing 23; the side of the mounting shell 9 facing the box body 1 is provided with a second gland 91, the mounting shell 9 is provided with a fixing bolt, the fixing bolt penetrates through the top cover 92, the mounting shell 9 and is connected with the second gland 91, the second gland 91 is provided with a second boss 93, the second boss 93 is inserted into the mounting shell 9, the other side of the mounting shell 9 is provided with a top cover 92, the top cover 92 is provided with a third boss, the third boss is inserted into the mounting shell 9, and the second boss 93 and the third boss are respectively abutted against the two sides of the second bearing 23 opposite to each other, so that the axial position of the second bearing 23 is limited. Preferably, in order to prevent the bolts from falling off due to long-term operation vibration, jamming the gear rack, a lock wire can be added to prevent loosening.

[0030] The output shaft 2 is coaxially connected with an output gear, the output gear is used for cooperating with a rack installed on a lifting pile leg to control the movement of the lifting pile leg, and the output gear is located between the box body 1 and the mounting shell 9. Through the adoption of the above technical scheme, the output shaft 2 is supported by double bearings, the first bearing 22 and the second bearing 23 are arranged on the two sides of the output gear respectively, the output gear is in cantilever stress, the bearings are arranged on both sides, and the two bearings share the stress, so that the selection of the bearings can select smaller bearings, saving cost and improving the safety factor in limited space. Preferably, the first bearing 22 and the second bearing 23 can adopt a large-clearance self-aligning roller bearing, which is more conducive to adapting to uneven stress caused by uneven installation and different centers in the field and improving the service life.

[0031] A through hole is coaxially formed in the output shaft 2, and a torque sensing device is arranged in the through hole to detect the output torque in real time, and when the overload reaches a certain degree, the power source is automatically cut off, thereby playing a monitoring and protection role.

[0032] The output shaft 2 and the input shaft 3 are connected through a reduction mechanism, the reduction mechanism is arranged in the box body 1, the reduction mechanism includes a plurality of transmission groups arranged along the axial direction of the output shaft 2, each transmission group includes a transmission shaft, a sun gear, a planet gear and a planet carrier, and the first transmission group 4, the second transmission group 5, …, the Nth transmission group are sequentially arranged in the direction from the input shaft 3 to the output shaft 2, in this application, the transmission groups are three, and in the direction from the input shaft 3 to the output shaft 2, they are the first transmission group 4, the second transmission group 5 and the third transmission group 6. The first transmission group 4 includes a first transmission shaft 41, a first sun gear 44, a first planet gear 43 and a first planet carrier 42, the second transmission group 5 includes a second transmission shaft 51, a second sun gear 54, a second planet gear 53 and a second planet carrier 52, and the third transmission group 6 includes a third transmission shaft 61, a third sun gear 64, a third planet gear 63 and a third planet carrier 62.

[0033] Specifically, the first transmission shaft 41, the second transmission shaft 51 and the third rotation shaft are coaxially arranged between the input shaft 3 and the output shaft 2 in sequence, the first transmission shaft 41 abuts against the end of the input shaft 3, the second transmission shaft 51 abuts against the end of the first transmission shaft 41 away from the input shaft 3, and the third transmission shaft 61 abuts against the end of the second transmission shaft 51 away from the first transmission shaft 41. The third transmission shaft 61 is coaxially and integrally arranged with the output shaft 2, the third planet carrier 62 is connected with the third transmission shaft 61 through a spline, the third planet gear 63 is rotationally connected to the third planet carrier 62 through a pin shaft, the third sun gear 64 is coaxially connected to the second transmission shaft 51, and the third planet gear 63 is arranged at the outer edge of the third sun gear 64 and meshes with the third sun gear 64; the second planet carrier 52 is connected with the second transmission shaft 51 through a spline, the second planet gear 53 is rotationally connected to the second planet carrier 52 through a pin shaft, the second sun gear 54 is coaxially connected to the first transmission shaft 41, and the second planet gear 53 is arranged at the outer edge of the second sun gear 54 and meshes with the second sun gear 54; the first planet carrier 42 is connected with the first transmission shaft 41 through a spline, the first planet gear 43 is rotationally connected to the first planet carrier 42 through a pin shaft, the first sun gear 44 is coaxially connected to the input shaft 3, and the first planet gear 43 is arranged at the outer edge of the first sun gear 44 and meshes with the first sun gear 44; the position opposite to the planet gear in the box body 1 is provided with an inner ring gear meshing with the planet gear.

[0034] It should be noted that the end surface of the planet gear and the corresponding planet carrier are provided with a needle roller baffle 7, and a positioning pin is arranged on the planet carrier. The limiting pin cooperates with the needle roller baffle 7 to fix the relative position between the needle roller baffle 7 and the planet carrier. Since the needle roller baffle 7 is harder than the planet carrier, fixing the needle roller baffle 7 and the planet carrier can prevent friction between the needle roller baffle 7 and the planet carrier, which causes the end surface of the planet carrier to wear and the planet gear to axially move.

[0035] In summary, the bearings are installed on both sides of the driving gear 21, and the double-sided bearings share the stress of the output shaft 2. Therefore, compared with the scheme in which the bearings are arranged on one side, the structure of the bearings is smaller in the same use condition, so that the overall structure is smaller, the cost can be saved, and the safety factor and service life can be improved in the limited space.

[0036] The integrated brake mechanism 8 is arranged at the end of the box body 1. When maintained, the entire brake mechanism 8 can be directly removed and replaced, which is convenient and fast, the volume of the component is small, the safety can be tested separately, and the brake safety is improved.

[0037] Based on the above ideal embodiments of the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined by the scope of the claims.

Claims

1. A reduction gearbox for a rack and pinion lift, characterized by, The box (1) and the mounting shell (9) arranged on one side of the box (1); The output shaft (2) is rotatably connected to the end of the box (1) close to the mounting shell (9), and the output shaft (2) is rotatably connected to the box (1) and the mounting shell (9) through the first bearing (22) and the second bearing (23) respectively, and the gear in the lifting device is arranged on the output shaft (2), and the gear in the lifting device is located between the box (1) and the mounting shell (9); The input shaft (3) is arranged at the end of the box (1) away from the input shaft (3); The brake mechanism (8) is arranged at the end of the box (1) away from the mounting shell (9) and connected with the input shaft (3); The reduction mechanism is arranged in the box (1), and the reduction mechanism is used for realizing the speed reduction transmission between the input shaft (3) and the output shaft (2). The box (1) is provided with a mounting hole (12) for the output shaft (2) to pass through, the first bearing (22) is arranged between the inner circle of the mounting hole (12) and the output shaft (2), the mounting hole (12) is provided with a limiting step (13) on the side close to the inside of the box (1), the end of the box (1) is provided with a first gland (11), the first gland (11) is provided with a first boss (14), the first boss (14) is inserted into the mounting hole (12), and the limiting step (13) and the first boss (14) are respectively abutted on the two sides opposite to the first bearing (22).

2. A reduction gearbox for a rack and pinion lift according to claim 1, characterized in that The second bearing (23) is arranged in the mounting shell (9), the mounting shell (9) is provided with a second gland (91) on the side facing the box (1), the second gland (91) is provided with a second boss (93), the second boss (93) is inserted into the mounting shell (9), the other side of the mounting shell (9) is provided with a top cover (92), the top cover (92) is provided with a third boss, the third boss is inserted into the mounting shell (9), and the second boss (93) and the third boss are respectively abutted on the two sides opposite to the second bearing (23).

3. The reduction gearbox of a rack and pinion lift according to claim 1, characterized in that, The mounting shell (9) is provided with a fixing bolt, the fixing bolt penetrates the top cover (92), the mounting shell (9) and is connected with the second gland (91).

4. A reduction gearbox for a rack and pinion lift as claimed in claim 3, characterised in that, The first bearing (22) and the second bearing (23) are both large-clearance self-aligning roller bearings.

5. The reduction gearbox of a rack and pinion lift according to claim 1, characterized in that, A through hole is formed in the output shaft (2), and a torque sensing device is arranged in the through hole.

6. The reduction gearbox of a rack and pinion lift according to claim 1, characterized in that, The brake mechanism (8) comprises a brake shell (81) and a brake device integrated in the brake shell (81), and the brake shell (81) is mounted at the end of the box (1).

7. The reduction gearbox of a rack and pinion lift according to claim 1, characterized in that, ​

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