CN221781588U - A grating encoder installation structure for calibrating the angular velocity of a turntable - Google Patents
A grating encoder installation structure for calibrating the angular velocity of a turntable Download PDFInfo
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- CN221781588U CN221781588U CN202420229568.XU CN202420229568U CN221781588U CN 221781588 U CN221781588 U CN 221781588U CN 202420229568 U CN202420229568 U CN 202420229568U CN 221781588 U CN221781588 U CN 221781588U
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Abstract
一种用于校准转台角速率的光栅编码器安装结构，设有定位芯轴、弹性片和磁性表座组件；所述定位芯轴为阶梯轴结构，其底座与待校准转台的回转轴同轴装配，定位芯轴的顶部与光栅编码器的回转轴或回转内圈固定连接；所述弹性片为圆环结构，在其前后两侧中间部位设置向上的凸台，弹性片通过所述凸台与光栅编码器的外圈固定连接，在弹性片的左右两侧对称设置向外延伸的支耳，弹性片通过所述支耳与左右对称布置的磁性表座组件装配；所述磁性表座组件吸附在转台外侧的固定座上。本实用新型解决了光栅编码器与转台回转轴不同轴的问题，达到了提高转台角速率测量结果准确性的目的。
A grating encoder installation structure for calibrating the angular velocity of a turntable is provided with a positioning mandrel, an elastic sheet and a magnetic table seat assembly; the positioning mandrel is a stepped shaft structure, the base of which is coaxially assembled with the rotary shaft of the turntable to be calibrated, and the top of the positioning mandrel is fixedly connected with the rotary shaft or the rotary inner ring of the grating encoder; the elastic sheet is a circular ring structure, and an upward boss is arranged in the middle of the front and rear sides of the elastic sheet, and the elastic sheet is fixedly connected with the outer ring of the grating encoder through the boss, and outwardly extending ears are symmetrically arranged on the left and right sides of the elastic sheet, and the elastic sheet is assembled with the magnetic table seat assembly symmetrically arranged on the left and right sides through the ears; the magnetic table seat assembly is adsorbed on the fixed seat outside the turntable. The utility model solves the problem of the grating encoder and the rotary shaft of the turntable not being coaxial, and achieves the purpose of improving the accuracy of the turntable angular velocity measurement result.
Description
Technical Field
The utility model relates to the technical field of angular rate detection of rotary equipment, in particular to a flexible mounting structure of a grating encoder for calibrating the angular rate of a turntable.
Background
In the technical field of aviation overhaul, a turntable is one of main components of rotary equipment and comprises a speed turntable, a flight simulation table and a simulation turntable. The angular rate error and the stability are important technical indexes of the turntable and are reflected in the dynamic performance, so that the angular rate error and the stability of the turntable are required to be calibrated and tested regularly. At present, the calibration of angular rate error and stability of a turntable is carried out according to the calibration standard of a JF1210-2008 low-speed turntable, a circular grating encoder (hereinafter referred to as a grating encoder for short) and a frequency counter are used as measuring instruments, the grating encoder and the turntable are coaxially assembled, the calibration is carried out by adopting a fixed angle time measurement method or a timing angle measurement method, and the shafting error of the grating encoder and the turntable is required to meet the requirement of assembly precision.
As shown in fig. 1, in the prior art, a grating encoder 2 and a turntable 1 are combined together through a rigid assembly fixture, wherein the assembly fixture is composed of a positioning mandrel 3 and an encoder fixing bracket 4, the encoder fixing bracket 4 is used for fixing an outer ring of the grating encoder 2, and the positioning mandrel 3 is fixedly connected with a rotating shaft or a rotating inner ring of the grating encoder 2; the positioning mandrel 3 is arranged at the main shaft of the turntable 1, and aims to enable the rotary shaft or the rotary inner ring of the grating encoder 2 to synchronously rotate with the main shaft of the turntable 1, a frequency counter is used for collecting pulse signals output by the grating encoder, a certain number of pulses correspond to a fixed angle, the corresponding pulse number can trigger the frequency counter to collect corresponding time, and then the angle rate can be obtained by dividing the rotation angle by the corresponding time. However, as the positioning mandrel 3 and the encoder fixing support 4 are of rigid connection structures, the problem that the positioning mandrel 3 is not coaxial with the rotating shaft of the turntable 1 is difficult to eliminate due to the influence of the installation error of the encoder fixing support 4, and the grating encoder 2 is installed eccentrically, so that cosine error exists in the measurement result; meanwhile, if the central axes of the grating encoder 2, the positioning mandrel 3 and the encoder fixing support 4 are not consistent, mechanical installation stress exists between the grating encoder 2 and the tool in the rotating process of the turntable 1, so that the accuracy of a measuring result is affected.
Disclosure of utility model
The utility model provides a grating encoder mounting structure for calibrating angular rate of a turntable, which aims to solve the problem that the grating encoder is not coaxial with a turntable rotating shaft due to the mounting error of a magnetic gauge stand assembly by arranging a flexible connection structure between an outer ring of the grating encoder and the magnetic gauge stand assembly, so as to achieve the aim of improving the accuracy of a turntable angular rate measurement result.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
A grating encoder mounting structure for calibrating angular rate of a turntable is provided with a positioning mandrel, an elastic sheet and a magnetic gauge stand assembly; the positioning mandrel is of a stepped shaft structure, a base of the positioning mandrel is coaxially assembled with a rotating shaft of the turntable to be calibrated, and the top of the positioning mandrel is fixedly connected with the rotating shaft or the rotating inner ring of the grating encoder; the elastic sheet is of a circular ring structure, the middle parts of the front side and the rear side of the elastic sheet are provided with upward bosses, the elastic sheet is fixedly connected with the outer ring of the grating encoder through the bosses, the left side and the right side of the elastic sheet are symmetrically provided with outward extending lugs, and the elastic sheet is assembled with the magnetic gauge stand assemblies which are arranged in a bilateral symmetry manner through the lugs; the magnetic gauge stand assembly is adsorbed on the fixed seat on the outer side of the rotary table.
According to the grating encoder mounting structure for calibrating the angular rate of the turntable, the elastic pieces are provided with the notch long grooves on the left side support lugs and the right side support lugs, two groups of the notch long grooves are oppositely arranged on each side support lug, and the opening directions of the two groups of notch long grooves are opposite.
According to the grating encoder mounting structure for calibrating the angular rate of the turntable, the notch long groove is parallel to the outer side edge of the support lug, and the tail part of the notch long groove is of a round hole structure.
According to the grating encoder mounting structure for calibrating the angular rate of the turntable, the elastic sheet is made of stainless steel, and the outer side ends of the left and right lugs of the elastic sheet are provided with the assembly holes matched with the magnetic gauge stand assembly.
According to the grating encoder mounting structure for calibrating the angular rate of the turntable, the positioning mandrel is made of 4Cr13 materials, and the base of the positioning mandrel is of a disc structure.
The grating encoder mounting structure for calibrating the angular rate of the turntable is characterized in that the grating encoder is provided with a central rotating shaft; the top of the positioning mandrel is provided with an encoder central rotating shaft plug hole, the outer wall of the upper part of the positioning mandrel is provided with a radial open slot, the positioning mandrel is divided into two half structures by a through slot arranged along the axial direction above the open slot, and locking screws are assembled on the two half structures to lock and fix the central rotating shaft of the grating encoder with the positioning mandrel through the locking screws.
The grating encoder mounting structure for calibrating the angular rate of the turntable is characterized in that the grating encoder is provided with a hollow rotary shaft; the upper part of the positioning mandrel is provided with an inserting shaft which can penetrate into the hollow rotating shaft of the grating encoder, the outside of the inserting shaft is provided with a locking holding ring, and the hollow rotating shaft of the grating encoder and the inserting shaft of the positioning mandrel are locked and fixed through a locking screw which is matched with the locking holding ring.
The utility model provides a grating encoder mounting structure for calibrating angular rate of a turntable, which can realize flexible connection between a grating encoder and a magnetic gauge stand by matching an elastic sheet fixed on a grating encoder shell with the magnetic gauge stand assembly, ensure coaxiality of a rotating shaft of the grating encoder and the rotating shaft of the turntable in the calibration process, and absorb assembly stress between the grating encoder and the magnetic gauge stand by elastic deformation of the elastic sheet, thereby achieving the aim of improving accuracy of measuring results of angular rate of the turntable.
Drawings
FIG. 1 is a schematic diagram of a combination structure of a circular grating encoder and a turntable through a rigid assembly tool in the prior art;
FIG. 2 is a schematic diagram of the overall structure of the present utility model;
FIG. 3 is a schematic view of the structure of an elastic sheet;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic diagram of a grating encoder with a central spindle mated with a positioning mandrel;
FIG. 6 is a schematic view of the cross-sectional structure A-A of FIG. 5;
FIG. 7 is a schematic diagram of a grating encoder with a hollow rotating shaft mated with a positioning mandrel;
FIG. 8 is a schematic view of the sectional structure B-B in FIG. 7.
The reference numerals in the drawings are defined as follows:
1 is a turntable; 2 is a grating encoder, 2-1 is a central rotating shaft, and 2-2 is a hollow rotating shaft;
3 is a positioning mandrel, 3-1 is a central rotating shaft plug hole, 3-2 is an open slot, 3-3 is a through slot arranged along the axial direction, and 3-4 is a plug shaft; 4 is an encoder fixing bracket; 5 is an elastic sheet, 5-1 is a boss, 5-2 is a supporting lug, 5-3 is an assembly hole, and 5-4 is a notch long groove; 6 is a magnetic gauge stand assembly; 7 is a locking screw; and 8 is a locking clamp ring.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and specific examples.
Referring to fig. 1, in the prior art, when the angular rate of a turntable 1 is calibrated, an inner ring or a rotating shaft of a grating encoder 2 and the turntable 1 are assembled together through a positioning mandrel 3, an encoder fixing support 4 is used for fixing the outer ring of the grating encoder 2, so that the rotating shaft or the rotating inner ring of the grating encoder 2 and a main shaft of the turntable 1 synchronously rotate, a pulse signal output by the grating encoder is acquired by using a frequency counter, a certain number of pulses correspond to a fixed angle, the corresponding pulse number can trigger the frequency counter to acquire corresponding time, and then the angle is divided by the corresponding time by the rotation angle to obtain the angular rate. However, as the positioning mandrel 3 and the encoder fixing support 4 are of rigid connection structures, the problem that the positioning mandrel 3 is not coaxial with the rotating shaft of the turntable 1 is difficult to eliminate due to the influence of the installation error of the encoder fixing support 4, and the grating encoder 2 is installed eccentrically, so that cosine error exists in the measurement result; meanwhile, the grating encoder 2, the positioning mandrel 3 and the encoder fixing support 4 are rigidly mounted together, and if central axes of the positioning mandrel 3 and the encoder fixing support 4 are not coincident, mechanical mounting stress exists between the grating encoder 2 and the tool in the rotating process of the turntable 1, so that accuracy of a measuring result is affected.
Referring to fig. 2, 3 and 4, in order to solve the problem of eccentric installation of a grating encoder in the process of calibrating and testing the angular velocity of a turntable, the utility model provides a grating encoder installation structure for calibrating the angular velocity of the turntable, which is provided with a positioning mandrel 3, an elastic sheet 5 and a magnetic gauge stand assembly 6; the positioning mandrel 3 is of a stepped shaft structure, is made of 4Cr13 material, is coaxially assembled with the rotating shaft of the turntable 1 to be calibrated through a disc base, and is fixedly connected with the rotating shaft or the rotating inner ring of the grating encoder 2 at the top of the positioning mandrel 3; the elastic sheet 5 is of a circular ring structure, the middle parts of the front side and the rear side of the elastic sheet 5 are provided with upward bosses 5-1, the elastic sheet 5 is fixedly connected with the outer ring of the grating encoder 2 through the bosses 5-1, the left side and the right side of the elastic sheet 5 are symmetrically provided with lugs 5-2 which extend outwards, and the elastic sheet 5 is assembled with magnetic gauge stand assemblies 6 which are arranged in a bilateral symmetry manner through the lugs 5-2; the magnetic gauge stand assembly 6 is adsorbed on a fixed seat on the outer side of the rotary table 1.
Referring to fig. 3 and 4, according to the grating encoder mounting structure for calibrating angular rate of a turntable, an elastic sheet 5 is made of a stainless steel sheet with the thickness of 5mm through a stamping and cutting process, two groups of open long grooves 5-4 are oppositely arranged on lugs 5-2 on the left side and the right side of the elastic sheet 5, the two groups of open long grooves 5-4 are parallel to the outer side edges of the lugs 5-2, the opening directions are opposite, the tail parts of the open long grooves 5-4 are of round hole structures, and assembly holes 5-3 matched with a magnetic gauge stand assembly 6 are formed in the outer side ends of the left side and the right side of the lugs 5-2.
Referring to fig. 5 and 6, when the grating encoder 2 is of a structure with a central rotating shaft 2-1, the top of the positioning mandrel 3 is provided with an encoder central rotating shaft inserting hole 3-1, the outer wall of the upper part of the positioning mandrel 3 is provided with a radial open slot 3-2, the positioning mandrel 3 is of a two-half structure divided into a through slot 3-3 arranged along the axial direction above the open slot 3-2, a locking screw 7 is assembled on the two-half structure, and the central rotating shaft 2-1 of the grating encoder 2 and the positioning mandrel 3 are locked and fixed through the locking screw 7.
Referring to fig. 7 and 8, when the grating encoder 2 is of a structure with a hollow rotating shaft 2-2, the upper part of the positioning mandrel 3 is provided with a plug-in shaft 3-4 which can penetrate into the hollow rotating shaft 2-2 of the grating encoder 2, the outer surface of the plug-in shaft 3-4 is provided with a locking clamp ring 8, and the hollow rotating shaft 2-2 of the grating encoder 2 and the plug-in shaft 3-4 of the positioning mandrel 3 are locked and fixed through a locking screw 7 assembled with the locking clamp ring 8.
Referring to fig. 2 to 8, when the present utility model is used to calibrate the angular velocity of a turntable, the present utility model is operated as follows:
a) Firstly, a positioning mandrel 3 is installed on a turntable 1 to be calibrated, and a magnetic gauge stand assembly 6 is adsorbed on a fixed seat on the outer side of the turntable 1;
b) Measuring the coaxiality of the positioning mandrel 3 and the rotary table 1 to be calibrated by utilizing a dial indicator, fixedly mounting the dial indicator on a magnetic gauge stand, and detecting the inner wall jumping amount of a central rotary shaft plug hole 3-1 of the encoder 2 arranged on the positioning mandrel 3 by utilizing a measuring head of the dial indicator for a circle of rotary table 1 of a grating encoder provided with a central rotary shaft 2-1; for the grating encoder provided with the hollow rotary shaft 2-2, the turntable 1 rotates for one circle, and the measuring head of the dial indicator is utilized to detect the jumping amount of the outer wall of the plug-in shaft 3-4 which is arranged on the positioning mandrel 3 and can penetrate into the hollow rotary shaft 2-2 of the grating encoder 2;
c) Adjusting the assembly position of the positioning mandrel 3 according to the data measured by the dial indicator until the turntable 1 drives the positioning mandrel 3 to rotate for one circle, and the maximum runout measured by the dial indicator is smaller than a set value (the set value is 0.006mm in the specific embodiment), so that the base of the positioning mandrel 3 is locked and fixed on the table top of the turntable 1;
d) The center rotating shaft 2-1 or the hollow rotating shaft 2-2 of the circular grating encoder 2 is sleeved in the center rotating shaft inserting hole 3-1 or the inserting shaft 3-4 of the positioning mandrel 3 in a sliding mode, and the rotating shaft system of the circular grating encoder 2 is locked by using the locking screw 7 and/or the locking clamp ring 8, so that the rotating shaft system of the circular grating encoder 2 is ensured to synchronously rotate along with the turntable 1;
e) The dial indicator is disassembled, the posture and the position of the magnetic gauge stand assembly 6 are adjusted, the locking parts at the end heads of the dial indicator are used for clamping the lugs 5-2 at the left side and the right side of the elastic piece 5, so that the magnetic gauge stand assembly 6 is flexibly connected with the outer ring of the circular grating encoder 2, and the outer ring of the circular grating encoder 2 is ensured not to rotate along with the turntable 1 in the process of calibrating the angular rate of the turntable;
f) The rotary table 1 is driven to rotate by the driving component, pulse signals output by the grating encoder 2 are collected by the frequency counter, a certain number of pulses correspond to a fixed angle, the corresponding pulse number can trigger the frequency counter to collect corresponding time, and the rotation angle is divided by the corresponding time to obtain the value of the rotation angle rate of the rotary table 1.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420229568.XU CN221781588U (en) | 2024-01-31 | 2024-01-31 | A grating encoder installation structure for calibrating the angular velocity of a turntable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420229568.XU CN221781588U (en) | 2024-01-31 | 2024-01-31 | A grating encoder installation structure for calibrating the angular velocity of a turntable |
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| Publication Number | Publication Date |
|---|---|
| CN221781588U true CN221781588U (en) | 2024-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420229568.XU Active CN221781588U (en) | 2024-01-31 | 2024-01-31 | A grating encoder installation structure for calibrating the angular velocity of a turntable |
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| CN (1) | CN221781588U (en) |
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- 2024-01-31 CN CN202420229568.XU patent/CN221781588U/en active Active
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