Method and device for assembling and adjusting precise rotary table shaft system

Abstract

The invention discloses a precise rotary table shafting assembling and adjusting method which comprises the steps that according to a product structure and a task form corresponding to a target shafting, a rotating shaft and a mounting base are used as assembling references, assembling units are divided, a process assembling sequence is determined, and target shafting assembling is completed based on the process assembling sequence; converting the target imaging pixel difference of the assembled target shafting into an optical index corresponding to the target shafting, and converting the optical index corresponding to the target shafting into a mechanical linear parameter corresponding to the target shafting; comparing the actual shafting assembly precision with the mechanical linear parameter value, and performing process design on the assembled target bearing in response to the situation that the actual shafting assembly precision is smaller than the mechanical linear parameter value; and verifying whether the shafting assembly precision corresponding to the target bearing subjected to the process design meets a system design index or not by using an optical method, and finishing the assembly and adjustment of the target shafting under the condition that the shafting assembly precision meets the system design index. By applying the method, the assembly quality can be stabilized, and the assembly efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of precision turntable shaft systems, and in particular to a precision turntable shaft system installation and adjustment method and device. Background Art

[0002] The axis system is the key to realize the organic connection between the components of the turntable. The frames are connected together through the axis system, and the torque and rotational motion are transmitted accurately through the axis system. The precision turntable is divided into the azimuth axis system and the pitch axis system. The space is monitored through the rotation of the two axis systems. The inclination rotation error and the axis vertical error of the axis system are important indicators of the precision turntable.

[0003] Currently, there are several main methods to solve the problem of unstable quality of shaft inclination rotation error: one is to provide a shaft inclination rotation error calculation method by establishing a finite element model to guide the optimal design of the shaft structure; the other is to propose an analysis method of local parallel structure by establishing a mathematical model; the above research has made very valuable explorations in different aspects to solve the problem of unstable quality of shaft inclination rotation error. However, there is little research on the shaft assembly process methods.

[0004] In view of this, how to provide a precision turntable shaft system installation and adjustment method to improve the stability of the shaft system inclination rotation error quality and reduce the debugging cycle has become a technical problem that urgently needs to be solved. Summary of the invention

[0005] The embodiments of the present application provide a precision turntable shaft system adjustment method and a precision turntable shaft system adjustment device, which are used to solve the problems of unstable quality of shaft system inclination angle rotation error and long debugging cycle.

[0006] In a first aspect of an embodiment of the present application, a precision turntable shaft system adjustment method is provided, comprising:

[0007] According to the product structure and task form corresponding to the target shaft system, the rotating shaft and the mounting seat are used as the assembly reference, the assembly units are divided, and the process assembly sequence is determined. Based on the process assembly sequence, the target shaft system assembly is completed, wherein the product structure corresponding to the target shaft system includes a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator and a motor rotor;

[0008] Converting the target imaging pixel difference of the assembled target axis system into an optical index corresponding to the target axis system, and converting the optical index corresponding to the target axis system into a mechanical linear parameter corresponding to the target axis system;

[0009] Comparing the actual shafting assembly accuracy with the mechanical linear parameter value, and in response to the actual shafting assembly accuracy being less than the mechanical linear parameter value, performing process design on the assembled target bearing, wherein the process design includes performing bearing assembly tooling, bearing lubrication, and bearing preload adjustment on the target shafting;

[0010] An optical method is used to verify whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design indicators. When the shaft system assembly accuracy meets the system design indicators, the target shaft system is assembled and adjusted. The shaft system assembly accuracy includes the bearing inclination rotation accuracy. A test light path is constructed using an optical method to detect the shaft system inclination rotation accuracy. The measured shaft system inclination rotation accuracy is less than the optical indicator.

[0011] In a second aspect of an embodiment of the present application, a precision turntable shaft system adjustment device is provided, comprising:

[0012] The assembly module is configured to divide the assembly units according to the product structure and task form corresponding to the target shaft system, with the rotating shaft and the mounting seat as the assembly reference, and determine the process assembly sequence, and complete the assembly of the target shaft system based on the process assembly sequence, wherein the product structure corresponding to the target shaft system includes a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator and a motor rotor;

[0013] A conversion module is configured to convert the target imaging pixel difference of the assembled target axis system into an optical index corresponding to the target axis system, and convert the optical index corresponding to the target axis system into a mechanical linear parameter corresponding to the target axis system;

[0014] A design module is configured to compare the actual shaft system assembly accuracy with the mechanical linear parameter value, and in response to the actual shaft system assembly accuracy being less than the mechanical linear parameter value, perform process design on the assembled target bearing, wherein the process design includes performing bearing assembly tooling, bearing lubrication, and bearing preload adjustment on the target shaft system;

[0015] The detection module is configured to verify by an optical method whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design indicators, and complete the assembly and adjustment of the target shaft system when the shaft system assembly accuracy meets the system design indicators, wherein the shaft system assembly accuracy includes the bearing inclination rotation accuracy, and the shaft system inclination rotation accuracy is detected by a test light path constructed by an optical method, and the measured shaft system inclination rotation accuracy is less than the optical indicator.

[0016] The present application provides a method for assembling and adjusting the shaft system of a precision turntable, comprising: first, according to the product structure and task form corresponding to the target shaft system, the rotating shaft and the mounting seat are used as the assembly reference, the assembly units are divided, and the process assembly sequence is determined, and based on the process assembly sequence, the target shaft system assembly is completed, wherein the product structure corresponding to the target shaft system includes a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator and a motor rotor; then, the target imaging pixel difference of the assembled target shaft system is converted into the optical index corresponding to the target shaft system, and the optical index corresponding to the target shaft system is converted into the mechanical linear parameter corresponding to the target shaft system; secondly, the actual shaft system assembly accuracy is compared and the mechanical linear parameter value, in response to the actual shaft system assembly accuracy being less than the mechanical linear parameter value, a process design is performed on the assembled target bearing, wherein the process design includes bearing assembly tooling, bearing lubrication and bearing preload adjustment for the target shaft system; finally, an optical method is used to verify whether the shaft system assembly accuracy corresponding to the target bearing for which the process design is completed meets the system design indicators, and when the shaft system assembly accuracy meets the system design indicators, the target shaft system is assembled and adjusted, wherein the shaft system assembly accuracy includes the bearing inclination rotation accuracy, and a test light path is constructed using an optical method to detect the shaft system inclination rotation accuracy, and the measured shaft system inclination rotation accuracy is less than the optical indicator.

[0017] The application of a precision turntable shaft system adjustment method provided in the embodiment of the present application can ensure the shaft system inclination rotation accuracy, stabilize the assembly quality, reduce the number of repeated adjustment, and improve the assembly efficiency. In addition, the present application analyzes the process method, provides beneficial value for solving similar problems, and has good practical guiding significance.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 A schematic diagram of a process flow of a precision turntable shaft system installation and adjustment method provided in an embodiment of the present application;

[0021] Figure 2A schematic diagram of the shaft system structure of a precision turntable provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the division of turntable shaft system assembly units in a precision turntable shaft system method provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of a turntable shaft system assembly process in a turntable shaft system assembly method in a precision turntable shaft system method provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the steps of converting optical and mechanical indicators in a precision turntable shaft system method provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of a deep groove ball bearing assembly tool in a precision turntable shafting method provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of an angular contact bearing assembly tool in a precision turntable shafting method provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of a precision turntable shaft system method provided in an embodiment of the present application, in a state where no force is applied, a rolling element is in a free state, and there is clearance between the rolling element and the inner and outer rings of the bearing;

[0028] Fig. 9 A schematic diagram of a precision turntable shaft system method provided in an embodiment of the present application showing a bearing subjected to force, relative displacement between the inner ring and the outer ring of the bearing, and clearance elimination;

[0029] Fig.10 A schematic diagram of the axis inclination error in a precision turntable axis system method provided in an embodiment of the present application;

[0030] Fig.11 A schematic diagram of the motion trajectory of the axis line in a precision turntable axis system method provided in an embodiment of the present application;

[0031] Fig.12 A schematic diagram of the optical path construction of an autocollimator for measuring the shafting accuracy in a precision turntable shafting method provided in an embodiment of the present application;

[0032] Fig.13 A schematic structural diagram of a precision turntable shaft system adjustment device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] See also Figure 1 , Figure 1 A flow chart of a precision turntable shaft system assembly and adjustment method provided in an embodiment of the present application specifically includes the following steps.

[0035] Step S102: Based on the product structure and task form corresponding to the target shaft system, the rotating shaft and the mounting seat are used as the assembly reference, the assembly units are divided, and the process assembly sequence is determined. Based on the process assembly sequence, the target shaft system assembly is completed, wherein the product structure corresponding to the target shaft system includes a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator, and a motor rotor. That is, starting from the top-level process design, the assembly unit is determined, and the assembly and adjustment process is proposed to provide a basic basis for the subsequent detailed process design and tooling design.

[0036] a) Step S104: converting the target imaging pixel difference of the assembled target axis system into an optical index corresponding to the target axis system, and converting the optical index corresponding to the target axis system into a mechanical linear parameter corresponding to the target axis system. That is, performing optical and mechanical index conversion, the conversion process is first converting the system pixel index into the axis system angle index, and then converting the axis system angle index into the axis system mechanical index.

[0037] b) Step S106: Compare the actual shaft system assembly accuracy with the mechanical linear parameter value. In response to the actual shaft system assembly accuracy being less than the mechanical linear parameter value, process design is performed on the assembled target bearing, wherein the process design includes bearing assembly tooling, bearing lubrication, and bearing preload adjustment for the target shaft system. That is, detailed process design is performed from the aspects of bearing selection, bearing lubrication, and bearing preload adjustment to ensure the stability of the shaft system inclination rotation accuracy; the shaft system inclination rotation accuracy of the installed and adjusted shaft system is compared with the converted value, and the actual installed and adjusted value should be less than the converted mechanical index.

[0038] Step S108: Use an optical method to verify whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design index. If the shaft system assembly accuracy meets the system design index, complete the adjustment of the target shaft system, wherein the shaft system assembly accuracy includes the bearing inclination rotation accuracy, and the test light path built by the optical method is used to detect the shaft system inclination rotation accuracy, and the measured shaft system inclination rotation accuracy is less than the optical index. That is, using the principle of optical reflection, build a test light path, detect the shaft system inclination rotation accuracy, and the measured value should be less than the converted shaft system angle index.

[0039] The following is an example of the orientation axis system of a certain type of project.

[0040] (1) Top-level process design

[0041] The top-level process design divides the product into assembly units according to the product structure and task form, determines the process assembly sequence, and provides a basic basis for subsequent detailed process design and tooling design.

[0042] a) Structural analysis

[0043] In an embodiment of the present application, the method for fixing the target axis system includes: determining the method for fixing the target axis system according to the operating temperature span of the turntable; in response to the operating temperature span of the turntable exceeding a preset temperature threshold, adopting a fixing method with one end fixed and the other end movable, wherein the angular contact bearing end is the fixed end, the deep groove ball bearing end is the movable end, the inner ring of the angular contact bearing is installed on the rotating shaft with clearance fit, and the outer ring is installed on the mounting seat with clearance fit; in response to the operating temperature span of the turntable not exceeding the preset temperature threshold, or the turntable is placed in a temperature-controlled environment, a method of fixing both ends is adopted.

[0044] Specifically, there are two ways to fix the shaft system: one is fixed at one end and the other end is free-floating, and the other is fixed at both ends. When the operating temperature span of the turntable is large, the method of fixing one end and floating at the other end is generally adopted; when the operating temperature span of the turntable is not large or the turntable has a temperature-controlled environment, the method of fixing at both ends is generally adopted. This article takes the azimuth shaft system with one end fixed and the other end free-floating as an example for analysis and research. Figure 2 As shown, Figure 2 A schematic diagram of the shaft system structure of a precision turntable provided in an embodiment of the present application.

[0045] Figure 2The azimuth axis system is mainly composed of a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator, a motor rotor, etc. The product provided in the embodiment of the present application has the following structural features: Feature 1, the product is based on the rotating shaft, and other parts are assembled one by one; Feature 2, the angular contact bearing end is the fixed end, and the deep groove ball bearing end is the floating end; the inner ring of the angular contact bearing is installed on the rotating shaft with clearance fit, and the outer ring is installed on the mounting seat with clearance fit. The adjustment of the fixed end angular contact bearing is a key factor affecting the accuracy of the axis system. Therefore, the rotating shaft and the mounting seat are the assembly datum of the axis system. The assembly datum is the basis for the division of assembly units. Dividing assembly units on the basis of the assembly datum can improve assembly efficiency and assembly quality.

[0046] b) Assembly unit division

[0047] In an embodiment of the present application, the assembly units are divided based on the product structure and task form corresponding to the target axis system and the rotating axis and the mounting seat as the assembly reference, including: determining the process separation surface based on the constraint relationship of the product structure corresponding to the target axis system, wherein the process separation surface is the rotating axis and the mounting seat; dividing the assembly units based on the process separation surface, wherein the assembly units include a first assembly unit and a second assembly unit, the first assembly unit including an angular contact bearing, a motor stator and a bearing pressure ring; the second assembly unit including a bearing seat, a bearing pressure ring, a deep groove ball bearing and a motor rotor, the second assembly unit is a sub-assembly, including a third assembly unit and a motor rotor, wherein the third assembly unit carries a bearing seat, a bearing pressure ring and a deep groove ball bearing.

[0048] Specifically, the basis for the division of assembly units is the structural characteristics, assembly datums, and constraint relationships of the product; the method for determining the assembly unit is to first divide the process separation surface according to the design separation surface and structural characteristics, and on this basis, further divide it according to the assembly level and constraint relationship to finally form an assembly unit.

[0049] Figure 2 The product design separation surfaces are the rotating shaft and the mounting seat. On the basis of the design separation surface, the process separation surface is determined according to the constraint relationship of the product structure. Considering factors such as product structure and assembly datum, the shaft system can be divided into two assembly units. One is assembly unit No. 1 consisting of angular contact bearings, motor stators, and bearing pressure rings. The other is assembly unit No. 2 consisting of bearing seats, bearing pressure rings, deep groove ball bearings, and motor rotors. In assembly unit No. 2, since the outer ring of the deep groove ball bearing is installed on the boss of the bearing seat, it has a constraint relationship with the bearing seat, while the inner ring and the azimuth axis are in a free state and have no constraint relationship. Therefore, according to the constraint relationship, the bearing seat, bearing pressure ring, and deep groove ball bearing can be further regarded as a small assembly unit No. 3.

[0050] The overall assembly idea is to divide the shaft system assembly into assembly unit No. 1 and assembly unit No. 2. Assembly unit No. 2 is a sub-assembly, which can also be decomposed into assembly unit No. 3 and individual parts. Assembly No. 3 is a clustered part and cannot be divided further. Therefore, the final result is as follows: Figure 3 The assembly unit shown, wherein Figure 3 A schematic diagram of the division of turntable shaft system assembly units in a precision turntable shaft system method provided in an embodiment of the present application.

[0051] c) Assembly process determination

[0052] During assembly, the smallest assembly unit is assembled first, then the upper level assembly is performed, and finally, the shaft system assembly is completed. Based on the assembly unit, the assembly workflow is determined as follows: Figure 4 As shown, a reasonable process assembly sequence can ensure the smoothness of the assembly process, among which, Figure 4 A schematic diagram of the turntable shaft system assembly process in a turntable shaft system assembly method in a precision turntable shaft system method provided in an embodiment of the present application.

[0053] (2) Optical-mechanical index conversion

[0054] The steps of optical-mechanical index conversion are: first convert the system index (target imaging pixel difference) into the optical index of the axis system, and then convert the optical index of the axis system into the mechanical linear parameters of the axis system, such as Figure 5 As shown, Figure 5 A schematic diagram of the optomechanical index conversion steps in a precision turntable axis system method provided in an embodiment of the present application.

[0055] The method of converting optomechanical parameters is as follows: the target pixel difference of the system is given by the optical design, in pixels; the optical parameters of the axis system, in arc seconds (") or milliradians (mrad), are converted by formula (1), where formula (1) is: pixel = arc seconds × focal length ÷ 220 pixel size; the mechanical linear parameters of the axis system, in mm, are converted by formula (2), thereby realizing the conversion of optomechanical parameters, where formula (2) is: Among them, ΔΦ is the axis inclination angle, in degrees; Δt is the radial length of the shaft system, in millimeters; L is the axial length of the shaft system, in millimeters.

[0056] (3) Detailed process design

[0057] Detailed process design is a detailed process design based on process planning to ensure assembly quality and assembly efficiency. The core component of the shaft system is the bearing, and the bearing assembly directly affects the accuracy of the shaft system. Therefore, the embodiment of the present application performs detailed process design from aspects such as bearing assembly tooling, bearing lubrication, and bearing preload adjustment.

[0058] a) Bearing press-fitting equipment design

[0059] In an embodiment of the present application, the process design for the assembled target bearing includes: performing bearing assembly tooling on the target bearing, wherein the deep groove ball bearing or the angular contact bearing is assembled in the hole of the mounting seat, and a transition piece pressure plate is provided at the bottom of the mounting seat; a press sleeve is provided on the deep groove ball bearing or the angular contact bearing, and a boss is provided on the press sleeve, and the boss acts on the outer ring of the deep groove ball bearing or the angular contact bearing.

[0060] Specifically, during the shaft assembly process, bearing installation is the core step. Bearing assembly can be done by hot assembly or cold assembly. Hot assembly uses the principle of thermal expansion and contraction to assemble bearings, while cold assembly uses tooling combined with a power device to install bearings. Figure 2 The bearings used in the experiment have large outer diameters, and thin inner and outer ring walls. Considering the actual assembly conditions and the assembly efficiency of mass production, this paper adopts a cold assembly method to assemble the bearings.

[0061] Therefore, deep groove ball bearing assembly tooling and angular contact bearing assembly tooling were designed respectively. The working principle of the tooling is as follows: Figure 6 , Figure 7 As shown, Figure 6 A schematic diagram of a deep groove ball bearing assembly tool in a precision turntable shafting method provided in an embodiment of the present application; Figure 7 A schematic diagram of an angular contact bearing assembly tool in a precision turntable shafting method provided in an embodiment of the present application.

[0062] When the deep groove ball bearing is assembled in the hole of the mounting seat, a transition piece pressure plate is set at the bottom of the mounting seat to prevent the power device from directly acting on the product; a pressing sleeve is set on the top of the bearing, and there is a boss on the pressing sleeve, which acts on the outer ring of the bearing; when the power device acts on the pressing sleeve, the pressing sleeve transfers the force to the bearing evenly. Because the bearing is evenly stressed, the internal structure of the bearing can be avoided from being damaged by assembly, thereby protecting the accuracy of the bearing; the design principle of the angular contact bearing assembly tooling is the same as that of the deep groove ball bearing assembly tooling, which will not be repeated here.

[0063] b) Bearing lubrication

[0064] The bearing must be lubricated before assembly. The purpose of lubrication is not only to reduce the friction and wear of the bearing, but also to cool, prevent rust, absorb vibration and reduce noise. The lubricants used in rolling bearings are mainly grease and oil. Generally, grease lubrication is used. The type of lubricant can also be determined according to the "Rolling Bearing Application Manual". Too much grease filled in the bearing will cause a large torque to be generated during the operation of the bearing, increase the bearing temperature rise, and generate heat. Too little grease filled will cause friction inside the bearing and poor vibration reduction effect.

[0065] The amount of grease for the newly installed bearing is determined according to the ratio of the rotational speed n to the limiting rotational speed nj. The general principle is as follows: when nj / n < 1.25, the grease filling amount is 1 / 3 of the effective space inside the bearing; when 1.25 < nj / n < 5, the grease filling amount is 1 / 3 - 2 / 3 of the effective space inside the bearing; when nj / n > 5, the grease filling amount is 2 / 3 of the effective space inside the bearing.

[0066] The effective space of the bearing is the total volume of the bearing minus the volume of the outer ring of the bearing, minus the volume of the inner ring of the bearing, minus the volume of the bearing balls, and then minus the volume of the bearing cage.

[0067] The amount of grease is measured in grams (g). Its calculation method is to multiply the above volume value by the density of the grease to calculate the weight of the grease, and then weigh out the corresponding grease.

[0068] The position for applying the grease is the side with a larger clearance of the bearing cage; the method for applying the grease is as follows: first, use a tool to apply the grease to be applied in small amounts and evenly on the end face of the bearing cage multiple times; then use a tool to fill the grease into the gaps of the cage, rotate the inner ring of the bearing forward and backward two circles each, so that the grease is evenly in contact with the balls; finally, wipe off the excess grease with a clean cloth; the grease should fill the balls and be applied evenly; there should be no grease on the inner and outer rings of the bearing.

[0069] c) Adjustment of bearing preload

[0070] In the embodiment of the present application, the process design for the assembled target bearing includes:

[0071] Performing a bearing preload adjustment process on the target shafting. Among them, during bearing assembly, through an axial force, the relative displacement between the inner ring and the outer ring of the bearing is controlled, and based on the relative displacement, the positions of the contact points between the rolling elements and the inner and outer rings of the bearing are adjusted to determine the actual shafting assembly accuracy.

[0072] Bearing preloading means that during bearing assembly, an axial force is applied to the inner or outer ring of the bearing to cause relative displacement between the inner and outer rings, and the positions of the contact points between the rolling elements and the inner and outer rings are adjusted, thereby eliminating the clearance in the bearing and achieving the purpose of improving the rotational accuracy of the shafting.

[0073] When the bearing is not under force, the rolling elements are in a free state, and there is a clearance between the rolling elements and the inner and outer rings of the bearing, as Figure 8 shown; the essence of adjusting the bearing preload is to adjust the positions of the rolling elements and the inner and outer rings so that the rolling elements are stressed at the contact angle γ position with the inner and outer rings, thereby enabling the bearing to reach the best accuracy, as Fig. 9 shown. Among them, Figure 8A schematic diagram of a precision turntable shaft system method provided in an embodiment of the present application, in a state where no force is applied, a rolling element is in a free state, and there is clearance between the rolling element and the inner and outer rings of the bearing; Fig. 9 A schematic diagram of a precision turntable shafting method provided in an embodiment of the present application in which a bearing is subjected to force, an inner ring and an outer ring of the bearing produce relative displacement, and clearance is eliminated.

[0074] The method of adjusting the bearing preload is as follows: Use a micrometer to measure the shaft system. When the shaft system rotates one circle, the runout value should be less than the index required by the system. If the rotation accuracy exceeds the tolerance, the compression amount of the bearing pressure ring should be adjusted to make the rotation error meet the requirements. The compression amount of the bearing pressure ring can be achieved by placing a gasket or adjusting the torque of the screw on the bearing pressure ring. The method of adjusting the torque of the screw on the bearing pressure ring is to tighten at the high point and loosen at the low point.

[0075] (4) Shafting accuracy inspection

[0076] In an embodiment of the present application, the optical method used to verify whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design indicators includes: building a shaft system optical path based on an autocollimator, a first reflector, a second reflector, a level and a thimble, wherein the first reflector is fixed on the main shaft and is used to reflect the optical fiber emitted by the autocollimator; the autocollimator is placed horizontally on an optical platform, and when the axis of the shaft system is perpendicular to the light output path of the autocollimator, the light path of the autocollimator is reflected by the second reflector so that the light path is bent back to the autocollimator; the thimble is used to support the mounting surface; the level is used to level the reference surface; adjust the light path trajectories of the first reflector and the second reflector in the shaft system optical path; test the shaft system accuracy corresponding to the shaft system optical path after the optical path adjustment is completed, and verify whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design indicators based on the parameter values ​​carried by the shaft system accuracy and the optical indicators.

[0077] a) Optical testing principle

[0078] After the shaft system is installed and adjusted, an optical method is needed to verify whether the shaft system assembly accuracy meets the system design indicators.

[0079] In an ideal state, when the shaft system rotates one circle, the motion trajectory of the axis is a circle, such as Fig.11 (a) As shown; in the actual state of the shaft system, the axis has an inclination angle θ, as shown in Fig.10 (a) As shown; The optical test of axis accuracy is based on the principle of autocollimator reflection to record the θ value of the axis, such as Fig.10 (b) As shown; because the axis has an angle θ, the axis motion trajectory of one rotation is connected end to end to form an ellipse or irregular circle, such as Fig.11 (b) or Fig.11(c) As shown in the figure, the higher the shaft assembly accuracy, the smaller the θ value, and the smaller the circle formed by the motion trajectory. Fig.10 A schematic diagram of the axis inclination error in a precision turntable axis system method provided in an embodiment of the present application; Fig.11 A schematic diagram of the motion trajectory of the axis line in a precision turntable axis system method provided in an embodiment of the present application.

[0080] b) Build the optical path

[0081] Since the test of the rotation accuracy of the shaft system actually measures the swing value of the axis, the optical path should be built based on the mounting surface. First, a reflector needs to be fixed on the main shaft to reflect the light emitted by the autocollimator. Secondly, an autocollimator is needed. The autocollimator is generally placed horizontally on an optical platform. If the axis of the shaft system is perpendicular to the light path of the autocollimator, a 45° reflector is also needed to reflect the light path of the autocollimator so that the light path can be turned back to the autocollimator. Finally, since the mounting surface is the reference, the reference surface needs to be leveled. Therefore, three pins are used to support the mounting surface and a spirit level is used for leveling.

[0082] Comprehensive analysis shows that the construction of the axis optical path requires autocollimator, reflector 1, reflector 2, level, thimble and other instrument tools; Diagram of optical path construction Fig.12 As shown in Fig.12 A schematic diagram of the optical path construction for measuring the shafting accuracy of an autocollimator in a precision turntable shafting method provided in an embodiment of the present application.

[0083] c) Adjust the optical path

[0084] The principle of adjusting the optical path is to eliminate the installation errors of the reflector 1 and the reflector 2 so as to make the reflector 1, the reflector 2 and the autocollimator optical path self-aligned.

[0085] The idea of ​​adjusting the optical path is: since the autocollimator measures its vertical inclination through reflection from the mirror, first adjust the two-dimensional angle of plane mirror 2 to allow the autocollimator to self-align through plane mirror 1; then adjust the two-dimensional angle of plane mirror 1 to make the movement trajectory of the axis line draw the smallest circle or the movement trajectory is no longer a circle, but an irregular random trajectory. The specific method is to observe the jump of the cross and find the position where the cross is most offset during the rotation process. By adjusting the two screws on the reflector 1, the cross is offset toward the center of the coordinate axis, and the adjustment amount each time is 1 / 2 of the offset; finally, adjust the two-dimensional angle of plane mirror 2 to realign the autocollimator and plane mirror 1.

[0086] d) Measuring shaft system accuracy

[0087] The measurement is to test the accuracy of the shaft system after adjusting the optical path. By extracting parameters and comparing optical indicators, it is determined whether the accuracy of the shaft system meets the requirements. When measuring, the first acquisition point is taken as the starting position. According to the principle of end-to-end connection, the shaft system is rotated at equal angles. The shaft system rotates continuously for one circle and compares the collected data. If the maximum value of these data is not greater than the indicator required by the system, it is qualified. If it is unqualified, it is necessary to readjust the preload of the bearing to make the shaft system more accurate until the optical indicator requirements are met.

[0088] The application of a precision turntable shaft system adjustment method provided in the embodiment of the present application can ensure the shaft system inclination rotation accuracy, stabilize the assembly quality, reduce the number of repeated adjustment, and improve the assembly efficiency. In addition, the present application analyzes the process method, provides beneficial value for solving similar problems, and has good practical guiding significance.

[0089] Corresponding to the above method embodiment, this specification also provides an embodiment of a precision turntable shaft system adjustment device, Fig.13 This is a schematic diagram of the structure of a precision turntable shaft system adjustment device provided in an embodiment of the present application. Fig.13 As shown, the device comprises:

[0090] The assembly module 1302 is configured to divide the assembly units according to the product structure and task form corresponding to the target shaft system, taking the rotating shaft and the mounting seat as the assembly reference, and determine the process assembly sequence, and complete the assembly of the target shaft system based on the process assembly sequence, wherein the product structure corresponding to the target shaft system includes a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator and a motor rotor;

[0091] The conversion module 1304 is configured to convert the target imaging pixel difference of the assembled target axis system into an optical index corresponding to the target axis system, and convert the optical index corresponding to the target axis system into a mechanical linear parameter corresponding to the target axis system;

[0092] The design module 1306 is configured to compare the actual shaft system assembly accuracy with the mechanical linear parameter value, and in response to the actual shaft system assembly accuracy being less than the mechanical linear parameter value, perform process design on the assembled target bearing, wherein the process design includes performing bearing assembly tooling, bearing lubrication, and bearing preload adjustment on the target shaft system;

[0093] The detection module 1308 is configured to verify by an optical method whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design indicators. When the shaft system assembly accuracy meets the system design indicators, the target shaft system assembly is completed. The shaft system assembly accuracy includes the bearing inclination rotation accuracy. The test light path constructed by an optical method is used to detect the shaft system inclination rotation accuracy. The measured shaft system inclination rotation accuracy is less than the optical indicator.

[0094] In an optional embodiment, the assembly module 1302 is further configured to:

[0095] Determine the fixing method of the target shaft system according to the operating temperature span of the turntable;

[0096] In response to the turntable operating temperature span exceeding a preset temperature threshold, a fixing method with one end fixed and the other end movable is adopted, wherein the angular contact bearing end is the fixed end, the deep groove ball bearing end is the movable end, the inner ring of the angular contact bearing is installed on the rotating shaft with clearance fit, and the outer ring is installed on the mounting seat with clearance fit;

[0097] In response to the operating temperature span of the turntable not exceeding the preset temperature threshold, or the turntable being placed in a temperature-controlled environment, a two-end fixing method is adopted.

[0098] In an optional embodiment, the assembly module 1302 is further configured to:

[0099] Determine a process separation surface according to the constraint relationship of the product structure corresponding to the target axis system, wherein the process separation surface is the rotating axis and the mounting seat;

[0100] Based on the process separation surface, the assembly unit is divided, wherein the assembly unit includes a first assembly unit and a second assembly unit, the first assembly unit includes an angular contact bearing, a motor stator and a bearing pressure ring; the second assembly unit includes a bearing seat, a bearing pressure ring, a deep groove ball bearing and a motor rotor, the second assembly unit is a sub-assembly, including a third assembly unit and a motor rotor, wherein the third assembly unit carries a bearing seat, a bearing pressure ring and a deep groove ball bearing.

[0101] In an optional embodiment, the design module 1306 is further configured to:

[0102] The target bearing is subjected to bearing assembly tooling, wherein the deep groove ball bearing or the angular contact bearing is assembled in the hole of the mounting seat, and a transition piece pressure plate is provided at the bottom of the mounting seat; a press sleeve is provided on the deep groove ball bearing or the angular contact bearing, and a boss is provided on the press sleeve, and the boss acts on the outer ring of the deep groove ball bearing or the angular contact bearing.

[0103] In an optional embodiment, the design module 1306 is further configured to:

[0104] The target shaft system is subjected to a bearing preload adjustment process, wherein, when the bearing is assembled, the relative displacement of the inner ring and the outer ring of the bearing is controlled by the axial force, and based on the relative displacement, the positions of the contact points between the rolling elements and the inner ring and the outer ring of the bearing are adjusted to determine the actual shaft system assembly accuracy.

[0105] In an optional embodiment, the detection module 1308 is further configured to:

[0106] Based on the autocollimator, the first reflector, the second reflector, the level and the ejector, an axis optical path is constructed, wherein the first reflector is fixed on the main shaft and is used to reflect the optical fiber emitted by the autocollimator; the autocollimator is horizontally placed on the optical platform, and when the axis of the axis is perpendicular to the optical path of the autocollimator, the optical path of the autocollimator is reflected through the second reflector so that the optical path is folded back to the autocollimator; the ejector is used to support the installation surface; the level is used to level the reference surface;

[0107] Adjusting the optical path trajectories of the first reflector and the second reflector in the axis optical path;

[0108] The shaft system accuracy corresponding to the shaft system optical path that has completed the optical path adjustment is tested, and based on the parameter values ​​carried by the shaft system accuracy and the optical indicators, it is verified whether the shaft system assembly accuracy corresponding to the target bearing that has completed the process design meets the system design indicators.

[0109] The application of a precision turntable shaft system adjustment device provided in the embodiment of the present application can ensure the rotation accuracy of the shaft system inclination angle, stabilize the assembly quality, reduce the number of repeated adjustment, and improve the assembly efficiency. In addition, the present application analyzes the process method, provides beneficial value for solving similar problems, and has good practical guiding significance.

[0110] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the network traffic anomaly detection device based on feature grouping and autoencoder integration, since it is basically similar to the network traffic anomaly detection method embodiment based on feature grouping and autoencoder integration, the description is relatively simple, and the relevant parts can be referred to the partial description of the network traffic anomaly detection method embodiment based on feature grouping and autoencoder integration.

[0111] It should be noted that the above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of the present specification.

[0112] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0113] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A method for adjusting the shaft system of a precision turntable, characterized in that: include: According to the product structure and task form corresponding to the target shaft system, the rotating shaft and the mounting seat are used as the assembly reference, the assembly units are divided, and the process assembly sequence is determined. Based on the process assembly sequence, the target shaft system assembly is completed, wherein the product structure corresponding to the target shaft system includes a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator and a motor rotor; Converting the target imaging pixel difference of the assembled target axis system into an optical index corresponding to the target axis system, and converting the optical index corresponding to the target axis system into a mechanical linear parameter corresponding to the target axis system; Comparing the actual shafting assembly accuracy with the mechanical linear parameter value, and in response to the actual shafting assembly accuracy being less than the mechanical linear parameter value, performing process design on the assembled target bearing, wherein the process design includes performing bearing assembly tooling, bearing lubrication, and bearing preload adjustment on the target shafting; An optical method is used to verify whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design indicators. When the shaft system assembly accuracy meets the system design indicators, the target shaft system is assembled and adjusted. The shaft system assembly accuracy includes the bearing inclination rotation accuracy. A test light path is constructed using an optical method to detect the shaft system inclination rotation accuracy. The measured shaft system inclination rotation accuracy is less than the optical indicator.

2. The method according to claim 1, characterized in that The method for fixing the target axis system comprises: Determine the fixing method of the target shaft system according to the operating temperature span of the turntable; In response to the turntable operating temperature span exceeding a preset temperature threshold, a fixing method with one end fixed and the other end movable is adopted, wherein the angular contact bearing end is the fixed end, the deep groove ball bearing end is the movable end, the inner ring of the angular contact bearing is installed on the rotating shaft with clearance fit, and the outer ring is installed on the mounting seat with clearance fit; In response to the operating temperature span of the turntable not exceeding the preset temperature threshold, or the turntable is placed in a temperature-controlled environment, a two-end fixing method is adopted.

3. The method according to claim 1, characterized in that According to the product structure and task form corresponding to the target axis system, the assembly unit is divided with the rotating axis and the mounting seat as the assembly reference, including: Determine a process separation surface according to the constraint relationship of the product structure corresponding to the target axis system, wherein the process separation surface is the rotating axis and the mounting seat; Based on the process separation surface, the assembly unit is divided, wherein the assembly unit includes a first assembly unit and a second assembly unit, the first assembly unit includes an angular contact bearing, a motor stator and a bearing pressure ring; the second assembly unit includes a bearing seat, a bearing pressure ring, a deep groove ball bearing and a motor rotor, the second assembly unit is a sub-assembly, including a third assembly unit and a motor rotor, wherein the third assembly unit carries a bearing seat, a bearing pressure ring and a deep groove ball bearing.

4. The method according to claim 1, characterized in that The process design of the assembled target bearing includes: The target bearing is subjected to bearing assembly tooling, wherein the deep groove ball bearing or the angular contact bearing is assembled in the hole of the mounting seat, and a transition piece pressure plate is provided at the bottom of the mounting seat; a press sleeve is provided on the deep groove ball bearing or the angular contact bearing, and a boss is provided on the press sleeve, and the boss acts on the outer ring of the deep groove ball bearing or the angular contact bearing.

5. The method according to claim 1, characterized in that The process design of the assembled target bearing includes: The target shaft system is subjected to a bearing preload adjustment process, wherein, when the bearing is assembled, the relative displacement of the inner ring and the outer ring of the bearing is controlled by the axial force, and based on the relative displacement, the positions of the contact points between the rolling elements and the inner ring and the outer ring of the bearing are adjusted to determine the actual shaft system assembly accuracy.

6. The method according to claim 1, characterized in that The optical method is used to verify whether the shaft system assembly accuracy corresponding to the target bearing that has completed the process design meets the system design index, including: Based on the autocollimator, the first reflector, the second reflector, the level and the ejector, an axis optical path is constructed, wherein the first reflector is fixed on the main shaft and is used to reflect the optical fiber emitted by the autocollimator; the autocollimator is horizontally placed on the optical platform, and when the axis of the axis is perpendicular to the optical path of the autocollimator, the optical path of the autocollimator is reflected through the second reflector so that the optical path is folded back to the autocollimator; the ejector is used to support the installation surface; the level is used to level the reference surface; Adjusting the optical path trajectories of the first reflector and the second reflector in the axis optical path; The shaft system accuracy corresponding to the shaft system optical path that has completed the optical path adjustment is tested, and based on the parameter values ​​carried by the shaft system accuracy and the optical indicators, it is verified whether the shaft system assembly accuracy corresponding to the target bearing that has completed the process design meets the system design indicators.

7. A precision turntable shaft system adjustment device, characterized in that: include: The assembly module is configured to divide the assembly units according to the product structure and task form corresponding to the target shaft system, with the rotating shaft and the mounting seat as the assembly reference, and determine the process assembly sequence, and complete the assembly of the target shaft system based on the process assembly sequence, wherein the product structure corresponding to the target shaft system includes a rotating shaft, an angular contact bearing, a deep groove ball bearing, a mounting seat, a bearing seat, a bearing pressure ring, a motor stator and a motor rotor; A conversion module is configured to convert the target imaging pixel difference of the assembled target axis system into an optical index corresponding to the target axis system, and convert the optical index corresponding to the target axis system into a mechanical linear parameter corresponding to the target axis system; A design module is configured to compare the actual shaft system assembly accuracy with the mechanical linear parameter value, and in response to the actual shaft system assembly accuracy being less than the mechanical linear parameter value, perform process design on the assembled target bearing, wherein the process design includes performing bearing assembly tooling, bearing lubrication, and bearing preload adjustment on the target shaft system; The detection module is configured to verify by an optical method whether the shaft system assembly accuracy corresponding to the target bearing of the completed process design meets the system design indicators, and complete the assembly and adjustment of the target shaft system when the shaft system assembly accuracy meets the system design indicators, wherein the shaft system assembly accuracy includes the bearing inclination rotation accuracy, and the shaft system inclination rotation accuracy is detected by a test light path constructed by an optical method, and the measured shaft system inclination rotation accuracy is less than the optical indicator.

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