Method for adjusting meshing precision of gear pair of flexible gearbox

Abstract

The invention relates to a method for adjusting the meshing precision of a gear pair of a flexible gear box, which comprises the following steps: by adjusting the height of a cushion block and the compression degree of a bolt, the cushion block and the bolt respectively generate jacking and pressing effects on a lower box body, so that the lower box body can be deformed, and the deformation of the lower box body caused by a heavy-weight gear shaft is compensated; compared with the prior art, when the large flexible gear box is assembled, the meshing precision of the gear pair can meet the requirement of the assembling technology through adjustment, gear grinding is not needed, or the gear grinding frequency is greatly reduced, the gear meshing noise and vibration are reduced, and the assembling precision of the large flexible gear box is improved. The anti-fatigue performance of the gear is improved, and the manufacturing cost and the construction period are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flexible gear box assembly, and in particular to a method for adjusting the meshing accuracy of a gear pair of a flexible gear box. Background Art

[0002] With the development of national industry, large-scale equipment is being domestically produced, such as reducers in the metallurgical and building materials industries. In order to reduce costs and meet the requirements of lightweight design, flexible gearboxes have received widespread attention. However, the flexible box is easily deformed when subjected to force. This feature is more prominent in large flexible boxes. In addition, the weight of the gear parts causes a large deviation of the box axis, resulting in the coloring of the gear pair failing to meet the assembly process requirements. Therefore, eccentric bearings are usually used in the design process. The eccentric bearings have the characteristics of thin walls and multiple degrees of freedom. That is, when the axis of the box undergoes flexural deformation, the installation angle of the eccentric bearing can be fine-tuned on site to improve the meshing of the gear pair while ensuring that the lubricating oil film is not damaged. However, considering the formation of the lubricating oil film of the eccentric bearing, the eccentricity is usually small (within 2mm), resulting in a small adjustment range for the coloring of the gear pair. The meshing accuracy of the adjusted gear pair still does not meet the assembly process requirements, and only a large number of gear grinding can be performed. There are three major disadvantages to gear grinding: first, the tooth side clearance increases during gear meshing, which reduces the gear meshing accuracy, resulting in increased meshing noise and increased vibration; second, the depth of the carburized layer on the tooth surface of the carburized gear decreases, resulting in reduced fatigue resistance of the gear; third, the manufacturing cost and construction period increase. Summary of the invention

[0003] The purpose of the invention is to provide a method for adjusting the meshing accuracy of gear pairs of flexible gear boxes in view of the problem that the meshing accuracy of gear pairs of large and medium-sized flexible gear boxes in the prior art cannot meet the assembly process requirements, and a large amount of gear grinding is required, resulting in increased meshing noise, increased vibration, reduced gear fatigue resistance, and increased manufacturing costs and construction period.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for adjusting the meshing accuracy of a gear pair of a flexible gear box comprises the following steps:

[0006] a. Design several supporting points according to the lower housing structure of the gearbox, install a height-adjustable pad at a position corresponding to any of the supporting points on the assembly platform, and level the top surfaces of all the pads to the same horizontal plane;

[0007] b. Hang the lower box body into the assembly platform, so that the bottom surface of the lower box body fits with the top surface of the cushion block; pass the screw rods of several bolts through the several mounting holes on the lower box body and match them with the threaded holes on the assembly platform, so that the bolt heads press the lower box body against the cushion block;

[0008] c. Installing an eccentric bearing bush and a gear shaft on the lower housing;

[0009] d. Use a coloring method to detect the meshing accuracy of the gear pair between the gear shafts, and adjust the height of the pad and the tightening degree of the bolt based on the detection result, or adjust the installation angle of the eccentric bearing;

[0010] e. Repeat step d until the meshing accuracy of the gear pair detected by the coloring method meets the assembly process requirements.

[0011] The present invention adopts the above-mentioned technical solution, through steps a and b, the bottom surface of the lower box is leveled and the lower box is fixed. After step c, the lower box is deformed due to the heavy weight of the gear shaft. Through the coloring method detection in step d, if the meshing accuracy of the gear pair is poor, only adjusting the installation angle of the eccentric bearing is not enough to correct it, then the height of the cushion block and the tightening degree of the bolt are adjusted. The cushion block and the bolt respectively exert a lifting and pressing effect on the lower box, both of which can cause the lower box to deform, and the cushion blocks and bolts at different positions can cause deformation at different positions of the lower box, thereby compensating for the deformation of the lower box caused by the heavy weight of the gear shaft. If the meshing accuracy of the gear pair is slightly insufficient, only the installation angle of the eccentric bearing is adjusted. If it is sufficient for correction, then the installation angle of the eccentric bearing is adjusted, and the meshing accuracy of the flexible gear box gear pair that meets the assembly process requirements is obtained through step e. Compared with the prior art, the meshing accuracy of the gear pair of large and medium-sized flexible gear boxes cannot meet the assembly process requirements during assembly, and a large number of gear grinding is required, resulting in increased meshing noise, intensified vibration, reduced gear fatigue resistance, and increased manufacturing cost and construction period. During the assembly of large and medium-sized flexible gear boxes, the present invention makes the meshing accuracy of the gear pair meet the assembly process requirements through adjustment, and does not require gear grinding or greatly reduces the frequency of gear grinding, thereby reducing gear meshing noise and vibration, improving gear fatigue resistance, and reducing manufacturing cost and construction period.

[0012] Furthermore, the method further comprises the steps of:

[0013] f. Record the dimensions of several preset positioning points on the lower housing joint surface in the height direction; this dimensional data can reflect the shape characteristics of the lower housing joint surface when the gear pair meshing accuracy meets the standard. When assembling the same type of flexible gearbox in the future, the lower housing can be deformed until the lower housing joint surface reaches this dimensional data. At this time, the gear pair meshing accuracy meets the standard and the adjustment is faster.

[0014] Furthermore, between steps b and c, the method further includes the following steps:

[0015] b1, measure the levelness of the lower box joint surface, if it meets the levelness requirements, proceed to step c; if it does not meet the requirements, the process ends and the lower box is repaired; when the processing accuracy of the lower box meets the standard, if the bottom surface of the lower box is horizontal, the lower box joint surface should also be horizontal. This step is to inspect the processing accuracy of the lower box. Generally speaking, the levelness of the lower box joint surface can meet the requirements. If the levelness does not meet the requirements, it means that the processing accuracy of the lower box is insufficient and needs to be repaired, and the process of this adjustment ends.

[0016] Furthermore, in step b1, the levelness of the joint surface of the lower box body is measured by a level meter, and the levelness requirement is: levelness ≤ 0.05 mm / m.

[0017] Furthermore, a ring-shaped bottom plate is formed at the bottom of the lower box body; in step a, several of the support points are located on the bottom surface of the bottom plate and are arranged in a circle along the circumferential direction; in step b, several of the mounting holes are provided on the bottom plate and are arranged in a circle along the circumferential direction; with such arrangement, several pads and several bolts are arranged around the bottom of the lower box body, and by adjusting the height of different pads and the tightening degree of different bolts, different positions of the lower box body can be lifted and pressed down to cause it to deform, thereby compensating for the deformation of the lower box body caused by the heavy weight of the gear shaft.

[0018] Furthermore, the pad is a machine tool pad; a machine tool pad is a common height-adjustable pad in the prior art and is easy to obtain.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: when assembling a large flexible gearbox, the meshing accuracy of the gear pair can be adjusted to meet the assembly process requirements, and there is no need for gear grinding or the frequency of gear grinding is greatly reduced, thereby reducing gear meshing noise and vibration, improving the gear fatigue resistance, and reducing manufacturing costs and construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the assembly structure of the present invention;

[0021] Figure 2 It is a top view of the assembly structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the pad.

[0023] Markings in the figure: 1-lower box, 2-assembly platform, 3-pad, 4-bolt, 5-gear shaft, 11-lower box joint surface, 12-bottom plate, 31-wedge-shaped moving block, 32-wedge-shaped base, 33-adjusting screw. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] This embodiment provides a method for adjusting the meshing accuracy of a gear pair of a flexible gear box, comprising the following steps:

[0027] a. According to the structure of the lower housing 1 of the gearbox, several support points are designed, and a height-adjustable pad 3 is installed at a position corresponding to any support point on the assembly platform 2, and the top surfaces of all pads 3 are leveled to the same horizontal plane; the bottom of the lower housing 1 is formed with a ring-shaped bottom plate 12; in step a, several support points are located on the bottom surface of the bottom plate 12 and are arranged in a circle along the annular direction; the pad 3 is a machine pad iron, which is a common industrial product, and its structure is as follows Figure 3 As shown, it is an existing structure, which includes a wedge-shaped moving block 31, a wedge-shaped base 32 and an adjusting screw 33. The height of the top surface of the cushion block 3 can be adjusted by rotating the adjusting screw 33 clockwise or counterclockwise;

[0028] b. Lift the lower box 1 into the assembly platform 2, so that the bottom surface of the lower box 1 fits with the top surface of the cushion block 3; pass the screws of a plurality of bolts 4 through the plurality of mounting holes on the lower box 1 and match with the threaded holes on the assembly platform 2, so that the heads of the bolts press the lower box 1 against the cushion block 3; in step b, the plurality of mounting holes are all provided on the bottom plate 12 and are arranged in a circle along the circumferential direction;

[0029] b1, measure the levelness of the lower box body joint surface 11, if it meets the levelness requirement, proceed to step c; if it does not meet the requirement, the process ends and the lower box body 1 is repaired; in step b1, the levelness of the lower box body joint surface 6 is measured by a level meter, and the levelness requirement is: levelness ≤ 0.05 mm / m;

[0030] c. An eccentric bearing and a gear shaft 5 are installed on the lower housing 1; a plurality of gear shafts 5 are rotatably installed on the lower housing 1, and the eccentric bearing serves as a bearing for the gear shaft 5, which is not shown in the figure;

[0031] d. Use the coloring method to detect the meshing accuracy of the gear pair between the gear shafts 5, and adjust the height of the pad 3 and the tightness of the bolt 4, or adjust the installation angle of the eccentric bearing bush based on the detection result; in step d, if the meshing accuracy of the gear pair is poor, and only adjusting the installation angle of the eccentric bearing bush is not enough to correct it, then adjust the height of the pad 3 and the tightness of the bolt 4, and the pad 3 and the bolt 4 respectively exert a lifting and pressing effect on the lower box body 1, which can cause the lower box body 1 to deform, and the pad 3 and the bolt 4 at different positions can cause deformation at different positions of the lower box body 1, thereby compensating for the deformation of the lower box body 1 caused by the heavy weight of the gear shaft 5. If the meshing accuracy of the gear pair is slightly insufficient, and only adjusting the installation angle of the eccentric bearing bush is sufficient to correct it, then adjust the installation angle of the eccentric bearing bush;

[0032] e. Repeat step d until the meshing accuracy of the gear pair detected by the coloring method meets the assembly process requirements;

[0033] f, record the dimensions of several preset positioning points on the lower housing joint surface 11 in the height direction. This dimension data can reflect the shape characteristics of the lower housing joint surface 11 when the meshing accuracy of the gear pair meets the standard.

[0034] The present invention adopts the above-mentioned technical solution, through steps a and b, the bottom surface of the lower box body 1 is leveled and the lower box body 1 is fixed. After step c, the lower box body 1 is deformed due to the heavy weight of the gear shaft 5. Through the coloring method detection in step d, if the meshing accuracy of the gear pair is poor, only adjusting the eccentric bearing installation angle is not enough to correct it, then adjust the height of the cushion block 3 and the tightening degree of the bolt 4. The cushion block 3 and the bolt 4 respectively produce a lifting and pressing effect on the lower box body 1, which can cause the lower box body 1 to deform, and the cushion blocks 3 and bolts 4 at different positions can cause deformation at different positions of the lower box body 1, thereby compensating for the deformation of the lower box body 1 caused by the heavy weight of the gear shaft 5. If the meshing accuracy of the gear pair is slightly insufficient, only adjusting the eccentric bearing installation angle is insufficient. If the installation angle of the central bearing is sufficient for correction, the installation angle of the eccentric bearing is adjusted, and the meshing accuracy of the flexible gear box gear pair that meets the assembly process requirements is obtained through step e. Compared with the prior art, the meshing accuracy of the gear pairs of large and medium-sized flexible gear boxes cannot meet the assembly process requirements during assembly, and a large number of gear grinding is required, resulting in increased meshing noise, intensified vibration, reduced gear fatigue resistance, and increased manufacturing cost and construction period. During the assembly of large and medium-sized flexible gear boxes, the present invention makes the meshing accuracy of the gear pairs meet the assembly process requirements through adjustment, and does not require gear grinding or greatly reduces the frequency of gear grinding, thereby reducing gear meshing noise and vibration, improving gear fatigue resistance, and reducing manufacturing cost and construction period.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for adjusting the meshing accuracy of a flexible gearbox gear pair, characterized in that: The steps include: a. Designing a plurality of supporting points according to the structure of the lower housing (1) of the gear box, installing a height-adjustable cushion block (3) at a position corresponding to any of the supporting points on the assembly platform (2), and leveling the top surfaces of all the cushion blocks (3) to the same horizontal plane; b. hoisting the lower box (1) into the assembly platform (2) so that the bottom surface of the lower box (1) fits the top surface of the cushion block (3); passing the screw rods of a plurality of bolts (4) through a plurality of mounting holes on the lower box (1) and engaging with the threaded holes on the assembly platform (2) so that the heads of the bolts press the lower box (1) against the cushion block (3); c. Installing an eccentric bearing bush and a gear shaft (5) on the lower housing (1); d. using a coloring method to detect the meshing accuracy of the gear pair between the gear shafts (5), and adjusting the height of the cushion block (3) and the degree of tightening of the bolt (4) or adjusting the installation angle of the eccentric bearing bush based on the detection result; e. Repeat step d until the meshing accuracy of the gear pair detected by the coloring method meets the assembly process requirements.

2. The adjustment method according to claim 1, characterized in that: Also includes the steps: f, record the dimensions of several preset positioning points on the box joint surface (11) in the height direction.

3. The adjustment method according to claim 1, characterized in that: Between the steps b and c, the following steps are also included: b1, measure the levelness of the lower box body joint surface (11), if it meets the levelness requirement, proceed to step c; if it does not meet the requirement, the process ends and the lower box body (1) is repaired.

4. The adjustment method according to claim 3, characterized in that: In step b1, the levelness of the lower box joint surface (6) is measured by a level meter, and the levelness requirement is: levelness ≤ 0.05 mm / m.

5. The adjustment method according to claim 1, characterized in that: The bottom of the lower box (1) is formed with an annular bottom plate (12); in step a, a plurality of the support points are located on the bottom surface of the bottom plate (12) and are arranged in a circle along the circumferential direction; in step b, a plurality of the mounting holes are provided on the bottom plate (12) and are arranged in a circle along the circumferential direction.

6. The adjustment method according to claim 1, characterized in that: The cushion block (3) is a machine pad.

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