CN108844445A - A kind of transmission shaft concentricity detecting tool - Google Patents
A kind of transmission shaft concentricity detecting tool Download PDFInfo
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- CN108844445A CN108844445A CN201811038718.4A CN201811038718A CN108844445A CN 108844445 A CN108844445 A CN 108844445A CN 201811038718 A CN201811038718 A CN 201811038718A CN 108844445 A CN108844445 A CN 108844445A
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B5/252—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
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Abstract
本发明提供一种传动轴用同轴度检测工装，包括工作台，工作台上安装有旋转气缸，旋转气缸的输出轴上设有工件固定轴，工件固定轴上设有传动轴，传动轴的内壁与工件固定轴的表面紧密接触；工件固定轴的上方设有平衡块，平衡块包括水平设置的上平面和内凹的弧形限位底面，弧形限位底面与传动轴近同轴设置，传动轴可嵌设于弧形限位底面内；平衡块的底面的左右两侧对称地连接有弹簧，弹簧的下端固定于工作台上；还包括固定架，固定架上设有百分表，百分表的表针可与平衡块的上平面接触。本发明的平衡块将百分表与传动轴之间点到点的瞬时离散型接触转变为点到面的稳定连续型接触，提高了检测精度，表针不会划过传动轴表面，保证了传动轴的外观品质。
The invention provides a coaxiality detection tool for a transmission shaft, which includes a workbench, a rotary cylinder is installed on the workbench, a workpiece fixing shaft is arranged on the output shaft of the rotation cylinder, a transmission shaft is arranged on the workpiece fixing shaft, and the The inner wall is in close contact with the surface of the fixed shaft of the workpiece; a balance block is arranged above the fixed shaft of the workpiece, and the balance block includes a horizontally arranged upper plane and a concave arc-shaped limit bottom surface, and the arc-shaped limit bottom surface is set nearly coaxially with the transmission shaft , the transmission shaft can be embedded in the bottom surface of the arc-shaped limit; the left and right sides of the bottom surface of the balance weight are symmetrically connected with springs, and the lower end of the spring is fixed on the workbench; it also includes a fixed frame with a dial indicator , the pointer of the dial indicator can be in contact with the upper plane of the balance weight. The balance block of the present invention transforms the point-to-point instantaneous discrete contact between the dial indicator and the transmission shaft into a point-to-surface stable continuous contact, which improves the detection accuracy, and the watch needle will not cross the surface of the transmission shaft, ensuring the transmission Shaft appearance quality.
Description
技术领域technical field
本发明属于传动轴加工技术领域，具体涉及一种传动轴用同轴度检测工装。The invention belongs to the technical field of transmission shaft processing, and in particular relates to a coaxiality detection tool for a transmission shaft.
背景技术Background technique
传动轴是可移动或转动的圆形物体配件，用于连接或装配各项配件，一般均使用轻而抗扭性佳的合金钢管制成。在传动轴生产过程中，传动轴的同轴度是一项重要的参数，如果同轴度超差，则可能使传动轴承受因弯矩引起的扭矩，与传动轴配合的连接件在随轴转动的过程中会产生交变应力，造成螺栓疲劳、断裂，因此，对成型后的传动轴进行同轴度检测非常重要。传统的检测方法为通过卡尺对传动轴轴体多个定点的直径进行测量，得到测量数据之后，再对测量结果进行对比，如果差值在一定范围内，则证明该传动轴的同轴度较高，否则较低，但是该方法会导致测量误差大，产品的合格率低，并且检测效率低。The transmission shaft is a movable or rotating circular object accessory, used to connect or assemble various accessories, and is generally made of light alloy steel pipe with good torsion resistance. In the production process of the transmission shaft, the coaxiality of the transmission shaft is an important parameter. If the coaxiality is out of tolerance, the transmission bearing may be subjected to the torque caused by the bending moment. During the rotation process, alternating stress will be generated, which will cause fatigue and fracture of the bolts. Therefore, it is very important to test the coaxiality of the formed transmission shaft. The traditional detection method is to measure the diameter of multiple fixed points of the transmission shaft body with a caliper, and then compare the measurement results after obtaining the measurement data. If the difference is within a certain range, it proves that the coaxiality of the transmission shaft is relatively good. High, otherwise lower, but this method will lead to large measurement errors, low product pass rate, and low detection efficiency.
鉴于以上原因，有企业研发了传动轴的同轴度检测工装，例如申请号为CN201721428297.7的专利，公开了一种传动轴用同轴度检测工装，包括底架、操作台、传动轴固定系统和检测系统，底架顶部焊接有操作台，操作台顶部左右两端安装有传动轴固定系统，检测系统安装在传动轴固定系统之间位于操作台顶部中间位置，操作台顶部中间位置设有滑轨。由于采用了上述技术方案，该装置灵活度高，能有效替代人工测量，减小误差，提高产品合格率。但是，由于传动轴检测过程中，百分表的表针与传动轴的弧形表面始终是点对点的接触，接触面积小而接触时间短，因此该检测方式具有瞬时性和离散性的特点，降低了检测精度；此外，百分表的表针直接划过传动轴表面，对传动轴表面产生划痕而降低产品的外观品质。In view of the above reasons, some companies have developed a coaxiality detection tool for the transmission shaft. For example, the patent application number CN201721428297.7 discloses a coaxiality detection tool for the transmission shaft, including a chassis, an operating table, and a transmission shaft fixing device. System and detection system, the console is welded on the top of the chassis, and the drive shaft fixing system is installed at the left and right ends of the top of the console. The detection system is installed between the drive shaft fixing systems and is located in the middle of the top of the console. rails. Due to the adoption of the above technical solution, the device has high flexibility, can effectively replace manual measurement, reduce errors, and improve the qualified rate of products. However, due to the point-to-point contact between the needle of the dial indicator and the arc surface of the transmission shaft during the detection process of the transmission shaft, the contact area is small and the contact time is short, so this detection method has the characteristics of instantaneousness and discreteness, which reduces the detection accuracy; in addition, the pointer of the dial gauge directly crosses the surface of the transmission shaft, which will scratch the surface of the transmission shaft and reduce the appearance quality of the product.
发明内容Contents of the invention
本发明的目的是提供一种检测效率高、检测精度高、检测过程中不影响传动轴的外观品质的传动轴用同轴度检测工装。The purpose of the present invention is to provide a coaxiality detection tool for a transmission shaft which has high detection efficiency and high detection precision and does not affect the appearance quality of the transmission shaft during the detection process.
本发明提供了如下的技术方案：The present invention provides following technical scheme:
一种传动轴用同轴度检测工装，包括工作台，工作台上安装有旋转气缸，旋转气缸的输出轴上安装有工件固定轴，工件固定轴上套设有传动轴，传动轴的内壁与工件固定轴的表面紧密接触；工件固定轴的上方设有平衡块，平衡块包括水平设置的上平面和内凹的弧形限位底面，弧形限位底面与传动轴近同轴设置，传动轴可嵌设于弧形限位底面内，平衡块的底面的左右两侧分别对称地连接有弹簧，弹簧的下端固定于工作台上；旋转气缸的上方设有固定架，固定架延伸至工件固定轴的上方，固定架上设有百分表，百分表的表针与平衡块的上平面接触。检测时先上拉平衡块，将传动轴卡在工件固定轴上，再松开平衡块，使平衡块抵在传动轴的上方，启动旋转气缸转动工件固定轴，当传动轴有同轴度加工偏差时，传动轴将同轴度偏差传递于平衡块上，使平衡块产生上下方向的轻微移动，平衡块的上平面将百分表的表针与传动轴轴壁之间点到点的瞬时离散型接触转变为点到面的稳定连续型接触，提高了检测精度，同时表针不会直接划过传动轴表面，避免传动轴表面产生划痕而降低产品的外观品质。平衡块下方的弹簧同时对平衡块施加向下的拉力，一方面可为平衡块提供上下移动量，另一方面可增加平衡块移动的平衡性，以保证检测结果精确可靠。A coaxiality detection tool for transmission shafts, including a workbench, on which a rotary cylinder is installed, a workpiece fixing shaft is installed on the output shaft of the rotation cylinder, a transmission shaft is sleeved on the workpiece fixing shaft, and the inner wall of the transmission shaft is connected to the The surface of the workpiece fixed shaft is in close contact; a balance block is arranged above the workpiece fixed shaft, and the balance block includes a horizontally arranged upper plane and a concave arc-shaped limit bottom surface. The shaft can be embedded in the arc-shaped limit bottom surface, and the left and right sides of the bottom surface of the balance weight are respectively connected with springs symmetrically, and the lower end of the spring is fixed on the workbench; there is a fixed frame above the rotary cylinder, and the fixed frame extends to the workpiece Above the fixed shaft, a dial indicator is arranged on the fixed frame, and the hands of the dial indicator are in contact with the upper plane of the balance weight. When testing, first pull up the balance weight, clamp the transmission shaft on the fixed shaft of the workpiece, and then loosen the balance weight so that the balance weight is on the top of the transmission shaft, start the rotating cylinder to rotate the fixed shaft of the workpiece, and when the transmission shaft has coaxiality processing When there is a deviation, the transmission shaft transmits the coaxiality deviation to the balance weight, causing the balance weight to move slightly up and down. The type contact is transformed into a stable and continuous point-to-surface contact, which improves the detection accuracy. At the same time, the watch needle will not directly cross the surface of the drive shaft to avoid scratches on the surface of the drive shaft and reduce the appearance quality of the product. The spring below the balance weight exerts a downward pull on the balance weight at the same time, on the one hand, it can provide the up and down movement of the balance weight, and on the other hand, it can increase the balance of the balance weight movement, so as to ensure accurate and reliable detection results.
优选的，固定架上方安装有升降气缸，升降气缸可升起固定架以及百分表，因此将传动轴卡在工件固定轴上时，百分表的表针不会对操作过程造成干涉，使用更加方便。Preferably, a lifting cylinder is installed above the fixed frame, and the lifting cylinder can lift the fixed frame and the dial indicator, so when the transmission shaft is clamped on the workpiece fixed shaft, the hands of the dial indicator will not interfere with the operation process, and the use is more convenient. convenient.
优选的，固定架上设有沿着工件固定轴的轴向延伸的腰型孔，腰型孔垂直于工作台设置，百分表安装于腰型孔内。百分表可在腰型孔内移动，从而可对传动轴的轴向进行多点检测，扩大了检测范围，使用更加灵活。Preferably, the fixed frame is provided with a waist-shaped hole extending axially along the workpiece fixing axis, the waist-shaped hole is arranged perpendicular to the worktable, and the dial indicator is installed in the waist-shaped hole. The dial indicator can be moved in the waist hole, so that the axial direction of the transmission shaft can be detected at multiple points, the detection range is expanded, and the use is more flexible.
优选的，腰型孔内固定有多个百分表，多个百分表可对传动轴的轴向多点同时检测，提高了检测效率，并且可同时读取多个百分表的数值，方便比较传动轴的轴向加工精度。Preferably, a plurality of dial indicators are fixed in the waist-shaped hole, and the plurality of dial indicators can simultaneously detect multiple points in the axial direction of the transmission shaft, which improves the detection efficiency, and can read the values of a plurality of dial indicators at the same time, It is convenient to compare the axial machining accuracy of the transmission shaft.
优选的，工作台上还设有控制器和报警器，百分表为数显百分表，百分表设有数据输出端口，数据输出端口通过数据线连接控制器，控制器连接报警器。在控制器内设定同轴度偏差报警阈值，控制器实时比较运算百分表的检测值与报警阈值，当百分表的检测值超过报警阈值时，控制器启动报警器报警。Preferably, a controller and an alarm are also provided on the workbench, the dial indicator is a digital display dial indicator, the dial indicator is provided with a data output port, the data output port is connected to the controller through a data line, and the controller is connected to the alarm. The coaxiality deviation alarm threshold is set in the controller, and the controller compares the detection value of the dial gauge with the alarm threshold in real time. When the detection value of the dial gauge exceeds the alarm threshold, the controller starts the alarm.
优选的，工件固定轴的自由端可拆卸地安装有防脱轴套，防脱轴套可通过螺纹连接或者过盈配合的方式固定于工件固定轴上，防脱轴套可抵住传动轴的端部。防脱轴套可将传动轴固定于工件固定轴上，防止传动轴在检测过程中发生转动或者移动现象，保证了检测过程的稳定性。Preferably, the free end of the workpiece fixed shaft is detachably equipped with an anti-off shaft sleeve, the anti-off shaft sleeve can be fixed on the workpiece fixed shaft by threaded connection or interference fit, and the anti-off shaft sleeve can withstand the Ends. The anti-off shaft sleeve can fix the transmission shaft on the fixed shaft of the workpiece, prevent the transmission shaft from rotating or moving during the detection process, and ensure the stability of the detection process.
优选的，旋转气缸的进气口设有节流阀，调节节流阀的开度可改变旋转气缸的转速，当传动轴的外径较大时，可适当提高旋转气缸的转速，当传动轴的外径较小时，可适当减小旋转气缸的转速，使用更加方便灵活。Preferably, the air inlet of the rotary cylinder is provided with a throttle valve, and adjusting the opening of the throttle valve can change the rotation speed of the rotary cylinder. When the outer diameter of the transmission shaft is large, the rotation speed of the rotary cylinder can be appropriately increased. When the outer diameter of the cylinder is small, the rotation speed of the rotary cylinder can be appropriately reduced, which is more convenient and flexible to use.
优选的，工件固定轴可通过螺纹连接、卡箍连接等常用的连接方式可拆卸地安装于旋转气缸的输出轴上，从而可根据待检测的传动轴的内径更换适合直径的工件固定轴。Preferably, the workpiece fixing shaft can be detachably installed on the output shaft of the rotary cylinder through common connection methods such as threaded connection and clamp connection, so that the workpiece fixing shaft of suitable diameter can be replaced according to the inner diameter of the transmission shaft to be detected.
本发明的有益效果是：本发明通过在传动轴上方设置平衡块，平衡块的上平面将百分表的表针与传动轴轴壁之间点到点的瞬时离散型接触转变为点到面的稳定连续型接触，提高了检测精度，同时表针不会直接划过传动轴表面，避免传动轴表面产生划痕而降低产品的外观品质。平衡块下方的两根弹簧同时对平衡块施加向下的拉力，一方面可为平衡块提供上下移动量，另一方面可增加平衡块移动的平衡性，以保证检测结果精确可靠。The beneficial effects of the present invention are: the present invention sets the balance weight above the transmission shaft, and the upper plane of the balance weight transforms the point-to-point instant discrete contact between the pointer of the dial gauge and the transmission shaft shaft wall into point-to-surface contact. Stable and continuous contact improves the detection accuracy. At the same time, the watch needle will not directly cross the surface of the drive shaft to avoid scratches on the surface of the drive shaft and reduce the appearance quality of the product. The two springs below the balance weight exert downward pull on the balance weight at the same time. On the one hand, it can provide the up and down movement of the balance weight, and on the other hand, it can increase the balance of the balance weight movement to ensure accurate and reliable detection results.
附图说明Description of drawings
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例一起用于解释本发明，并不构成对本发明的限制。在附图中：The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:
图1是本发明的结构示意图；Fig. 1 is a structural representation of the present invention;
图2是本发明的平衡块与传动轴的位置关系截面示意图；Fig. 2 is a schematic cross-sectional view of the positional relationship between the balance weight and the drive shaft of the present invention;
图3是本发明的固定架俯视结构示意图。Fig. 3 is a top view structural diagram of the fixing frame of the present invention.
图中标记为：1.工作台；2.旋转气缸；3.工件固定轴；4.传动轴；5.平衡块；6.上平面；7.弧形限位底面；8.弹簧；9.固定架；10.百分表；11.升降气缸；12.腰型孔；13.控制器；14.报警器；15.防脱轴套；16.节流阀。Marked in the figure: 1. Workbench; 2. Rotary cylinder; 3. Workpiece fixed shaft; 4. Transmission shaft; 5. Balance weight; 6. Upper plane; 7. Arc-shaped bottom surface; 8. Spring; Fixed frame; 10. Dial indicator; 11. Lifting cylinder; 12. Waist hole; 13. Controller; 14. Alarm; 15. Anti-off shaft sleeve; 16. Throttle valve.
具体实施方式Detailed ways
如图1和图2所示，一种传动轴用同轴度检测工装，包括工作台1，工作台1上安装有旋转气缸2，旋转气缸2可360°旋转，旋转气缸2的输出轴上安装有工件固定轴3，工件固定轴3上套设有传动轴4，传动轴4的内壁与工件固定轴3的表面紧密接触；工件固定轴3的上方设有平衡块5，平衡块5包括水平设置的上平面6和内凹的弧形限位底面7，弧形限位底面7与传动轴4近似同轴设置，传动轴4的上侧可嵌设于弧形限位底面7内，平衡块5的底面的左右两侧分别对称地连接有弹簧8，弹簧8的下端固定于工作台1上；旋转气缸2的上方设有固定架9，固定架9延伸至工件固定轴3的上方，固定架9上设有百分表10，百分表10的表针与平衡块的上平面6接触。As shown in Figures 1 and 2, a coaxiality detection tool for transmission shafts includes a workbench 1, on which a rotary cylinder 2 is installed, and the rotary cylinder 2 can rotate 360°. On the output shaft of the rotary cylinder 2 A workpiece fixed shaft 3 is installed, and a transmission shaft 4 is set on the workpiece fixed shaft 3. The inner wall of the transmission shaft 4 is in close contact with the surface of the workpiece fixed shaft 3; a balance weight 5 is arranged above the workpiece fixed shaft 3, and the balance weight 5 includes The upper plane 6 arranged horizontally and the concave arc-shaped bottom surface 7, the arc-shaped bottom surface 7 and the transmission shaft 4 are arranged approximately coaxially, and the upper side of the transmission shaft 4 can be embedded in the arc-shaped bottom surface 7, The left and right sides of the bottom surface of the balance weight 5 are respectively symmetrically connected with springs 8, and the lower end of the springs 8 is fixed on the workbench 1; above the rotary cylinder 2, a fixed frame 9 is arranged, and the fixed frame 9 extends to the top of the workpiece fixed shaft 3 , The fixed frame 9 is provided with a dial indicator 10, and the hands of the dial indicator 10 are in contact with the upper plane 6 of the balance weight.
固定架9上方安装有升降气缸11，升降气缸11可升起固定架9以及百分表10，因此当将传动轴4卡在工件固定轴3上时，百分表10的表针不会对操作过程造成干涉，使用更加方便。A lifting cylinder 11 is installed above the fixed frame 9, and the lifting cylinder 11 can lift the fixed frame 9 and the dial indicator 10, so when the transmission shaft 4 is stuck on the workpiece fixed shaft 3, the hands of the dial indicator 10 will not operate The process causes interference and is more convenient to use.
如图1和3所示，固定架9上设有沿着工件固定轴3的轴向延伸的腰型孔12，腰型孔12垂直于工作台1设置，百分表10安装于腰型孔12内。百分表10可在腰型孔12内移动，从而可对传动轴4的轴向进行多点检测，扩大了检测范围，使用更加灵活。As shown in Figures 1 and 3, the fixed frame 9 is provided with a waist-shaped hole 12 extending axially along the workpiece fixing shaft 3, the waist-shaped hole 12 is arranged perpendicular to the workbench 1, and the dial indicator 10 is installed in the waist-shaped hole within 12. The dial gauge 10 can move in the waist hole 12, so that the axial direction of the drive shaft 4 can be detected at multiple points, the detection range is enlarged, and the use is more flexible.
腰型孔12内固定有多个百分表10，多个百分表10可对传动轴4的轴向多点同时检测，提高了检测效率，并且检验员可同时读取多个百分表的数值，方便比较传动轴的轴向加工精度。A plurality of dial indicators 10 are fixed in the waist hole 12, and the plurality of dial indicators 10 can detect multiple points in the axial direction of the transmission shaft 4 at the same time, which improves the detection efficiency, and the inspector can read multiple dial indicators at the same time It is convenient to compare the axial machining accuracy of the transmission shaft.
工作台1上还设有控制器13和报警器14，百分表10为数显百分表，百分表10设有数据输出端口，数据输出端口通过数据线连接控制器13，控制器13连接报警器14。在控制器13内设定同轴度偏差报警阈值，控制器13实时比较运算百分表10的检测值与报警阈值，当百分表10的检测值超过报警阈值时，控制器13启动报警器14报警。The workbench 1 is also provided with a controller 13 and an alarm 14. The dial indicator 10 is a digital display dial indicator. The dial indicator 10 is provided with a data output port, and the data output port is connected to the controller 13 by a data line, and the controller 13 Connect the alarm 14. The coaxiality deviation alarm threshold is set in the controller 13, and the controller 13 compares the detection value of the dial indicator 10 with the alarm threshold in real time, and when the detection value of the dial indicator 10 exceeds the alarm threshold, the controller 13 activates the alarm 14 call the police.
工件固定轴3的自由端可拆卸地安装有防脱轴套15，防脱轴套15可通过螺纹连接或者过盈配合的方式固定于工件固定轴3上，防脱轴套15可抵住传动轴4的端部。防脱轴套15可将传动轴4固定于工件固定轴3上，防止传动轴4在检测过程中发生转动或者移动现象，保证了检测过程的稳定性。The free end of the workpiece fixed shaft 3 is detachably equipped with an anti-off shaft sleeve 15, which can be fixed on the workpiece fixed shaft 3 through threaded connection or interference fit, and the anti-off shaft sleeve 15 can resist the transmission end of shaft 4. The anti-off shaft sleeve 15 can fix the transmission shaft 4 on the workpiece fixing shaft 3, prevent the transmission shaft 4 from rotating or moving during the detection process, and ensure the stability of the detection process.
旋转气缸2的进气口设有节流阀16，调节节流阀16的开度可改变旋转气缸2的转速，当传动轴4的外径较大时，可适当提高旋转气缸2的转速，当传动轴4的外径较小时，可适当减小旋转气缸2的转速，使用更加方便灵活。The air inlet of the rotary cylinder 2 is provided with a throttle valve 16, and the opening degree of the throttle valve 16 can be adjusted to change the rotating speed of the rotary cylinder 2. When the outer diameter of the transmission shaft 4 is large, the rotating speed of the rotary cylinder 2 can be appropriately increased. When the outer diameter of the transmission shaft 4 is small, the rotating speed of the rotary cylinder 2 can be appropriately reduced, and the use is more convenient and flexible.
工件固定轴3可通过螺纹连接、卡箍连接等常用的连接方式可拆卸地安装于旋转气缸2的输出轴上，从而可根据待检测的传动轴4的内径更换适合直径的工件固定轴3。The workpiece fixed shaft 3 can be detachably installed on the output shaft of the rotary cylinder 2 through commonly used connection methods such as threaded connection and clamp connection, so that the workpiece fixed shaft 3 of suitable diameter can be replaced according to the inner diameter of the transmission shaft 4 to be detected.
检测时先向上拉起平衡块，将传动轴套在工件固定轴上，然后松开平衡块，使平衡块在弹簧的拉力下自动抵在传动轴的上方，再将防脱轴套固定于工件固定轴的另一端，启动旋转气缸转动工件固定轴，当传动轴有同轴度加工偏差时，传动轴将同轴度偏差传递至平衡块上，使平衡块产生上下方向的轻微移动，平衡块的上平面将百分表的表针与传动轴轴壁之间点到点的瞬时离散型接触转变为点到面的稳定连续型接触，同时表针不会直接划过传动轴表面。When testing, first pull up the balance weight, put the transmission shaft on the fixed shaft of the workpiece, and then loosen the balance weight, so that the balance weight automatically rests on the top of the transmission shaft under the tension of the spring, and then fix the anti-off shaft sleeve on the workpiece At the other end of the fixed shaft, start the rotary cylinder to rotate the fixed shaft of the workpiece. When the transmission shaft has a coaxiality machining deviation, the transmission shaft will transfer the coaxiality deviation to the balance weight, causing the balance weight to move slightly up and down. The upper plane of the dial indicator transforms the point-to-point instantaneous discrete contact between the pointer of the dial indicator and the shaft wall of the transmission shaft into a stable and continuous point-to-surface contact, and at the same time, the pointer does not directly cross the surface of the transmission shaft.
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still understand the foregoing embodiments The recorded technical solutions are modified, or some of the technical features are equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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