Straightness measuring device for slender rod piece

Abstract

The utility model discloses a straightness measuring device for a slender rod piece, which comprises a supporting unit, a driving unit and a measuring unit, and is characterized in that the supporting unit is used for bearing a horizontally placed rod piece; the driving unit is detachably connected with the rod piece and used for driving the rod piece to rotate around the axis of the rod piece. The measuring unit comprises a measuring frame and a measuring plate, the measuring plate is rotationally connected with the measuring frame, the measuring plate is provided with a measuring end and an indicating end, the measuring end is placed on the side face of the rod piece, and the indicating end is used for reflecting the straightness of the rod piece. Compared with the prior art, the long and thin rod piece straightness measuring device adopts the supporting unit to bear the rod piece, the requirement for the straightness of the supporting unit is low, the equipment measuring cost can be greatly reduced, meanwhile, the supporting unit can bypass connecting lugs at the two ends of the rod piece to bear the rod piece, the connecting lugs do not need to be dismantled before measurement, and the measuring efficiency is improved. The measurement operation is simplified, and the measurement efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a measuring tool, concretely relates to a straightness measuring device of slender rod piece. BACKGROUND

[0002] The mechanical transmission of the aircraft flight control system mostly adopts a linkage device, and commonly used are pull rods for transmitting axial force, torsion tubes for transmitting torque and the like. These rod pieces are fixedly connected by a middle slender metal tube and two ears. In the use process, the pulling / pressing, shearing and other working loads borne by the rod piece, as well as the vibration load and inertial load during the flight of the aircraft, are all transmitted through the metal tube. If the metal tube is bent and deformed, it may cause vibration and operation difficulty, or even lead to instability, damage of the rod piece and endanger flight safety. Therefore, the straightness of the metal tube is required to be very high in maintenance: the lateral bending of each meter length is not more than 0.5 mm. The metal tube must be corrected if the straightness does not meet the requirement.

[0003] For the measurement of the straightness of the slender rod piece, a visual inspection method is generally used first. For the visible or suspected bending deformation, the metal tube is placed on a platform and rolled to check the adhesion of the metal tube and the platform. The maximum gap between the metal tube and the platform plane in the rolling process is measured to determine whether the straightness of the rod piece meets the requirement.

[0004] This detection method has the following shortcomings:

[0005] 1) The rolling inspection method is very cumbersome. In order to avoid the interference of the joints, rivets and the like, the ears at both ends need to be removed before rolling measurement, and the metal tube is placed on the platform alone to roll, so that the measurement is accurate.

[0006] 2) The rolling inspection requires a special platform. Since the comparison and measurement are based on the plane, the flatness of the platform itself is required to be high, and the stability is also required to be good when the rolling method is used to measure the straightness. Meanwhile, the longest rod piece on the aircraft is more than 2 meters long, and a larger platform must be used to meet the repair of all rod pieces. Such a platform is usually very heavy, bulky, occupies a large space and is expensive. CONTENT OF THE UTILITY MODEL

[0007] The utility model aims at overcoming the above technical defects, and provides a straightness measuring device of slender rod piece, which solves the technical problem that the straightness of the rod piece cannot be measured conveniently in the prior art, and the equipment cost is high.

[0008] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0009] In the first aspect, the utility model provides a straightness measuring device of slender rod piece, which comprises a support unit for bearing the horizontally placed rod piece.

[0010] A driving unit is detachably connected with the rod for driving the rod to rotate around its axis;

[0011] A measuring unit comprises a measuring frame and a measuring plate, the measuring plate is rotationally connected with the measuring frame, the measuring plate has a measuring end and an indicating end, the measuring end is placed on the side surface of the rod, and the indicating end is used to reflect the straightness of the rod.

[0012] In some embodiments, two support units are arranged at intervals, the two ends of the rod are respectively placed on the two support units, and the measuring unit is arranged between the two support units.

[0013] In some embodiments, the support unit comprises a support frame and two rollers, the rollers are rotationally connected with the support frame, the two rollers are arranged side by side and have parallel axes, and the two rollers are used to bear the rod.

[0014] In some embodiments, the support frame has a mounting slide rail arranged in the vertical direction, the mounting slide rail is communicated with the upper top surface of the support frame, and the driving unit is slidably connected with the mounting slide rail of one of the support frames.

[0015] In some embodiments, the driving unit comprises a connecting rod, a driving motor and a driving wheel, the connecting rod is slidably connected with the support frame, the driving motor is fixedly connected with the connecting rod, the driving shaft of the driving motor is coaxially fixedly connected with the driving wheel, the driving wheel abuts against the side surface of the rod, and the rod is driven to rotate by friction.

[0016] In some embodiments, the driving unit further comprises a speed reducer, the driving shaft of the driving motor is connected with the driving wheel through the speed reducer.

[0017] In some embodiments, the driving unit further comprises a storage battery, the storage battery is arranged on the connecting rod and is electrically connected with the driving motor to supply power to the driving motor.

[0018] In some embodiments, the driving unit further comprises a counterweight, the counterweight is arranged on the connecting rod.

[0019] In some embodiments, the measuring unit further comprises a scale disc, the scale disc is fixedly connected with the measuring frame and is arranged close to the indicating end, and when the measuring plate rotates, the indicating end can point to different positions on the scale disc.

[0020] In some embodiments, the measuring plate is an isosceles triangle, the measuring end and the indicating end are respectively located at two base angles of the measuring plate, and the top angle of the measuring plate is rotationally connected with the measuring frame.

[0021] Compared with the prior art, the straightness measuring device for the slender rod piece provided by the utility model adopts a support unit to bear the rod piece, has very low requirement on the flatness of the support unit, can greatly reduce the equipment measuring cost, and meanwhile the support unit can also bear the rod piece by bypassing the lug and other structures at the two ends of the rod piece, so that the lug does not need to be removed before measurement, the measurement operation is simplified, and the measurement efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the straightness measuring device for the slender rod piece provided by the utility model embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the utility model.

[0024] In order to solve the technical problems that the straightness of the rod piece is inconvenient to measure and the equipment cost is high, the utility model provides a straightness measuring device for the slender rod piece, which can realize convenient and fast measurement of the straightness of the rod piece.

[0025] It should be noted that the straightness measuring device for the slender rod piece is used for but not limited to measuring the slender rod piece on the airplane and the like, in order to facilitate the description, in the utility model, only the straightness measuring device for the slender rod piece is taken as an example to measure the straightness of the slender rod piece on the airplane, and the principle of the straightness measuring device for the slender rod piece to measure the straightness of other slender rod pieces is substantially the same as that of the slender rod piece on the airplane, which is not described here.

[0026] Please refer to Figure 1 , Figure 1 is a structural schematic view of the straightness measuring device for the slender rod piece in the utility model embodiment, the straightness measuring device for the slender rod piece comprises a support unit 1, a driving unit 2 and a measuring unit 3.

[0027] The support unit 1 is used to bear the horizontally placed rod piece 4. The driving unit 2 is detachably connected with the rod piece 4 to drive the rod piece 4 to rotate around the axis thereof. The measuring unit 3 comprises a measuring frame 31 and a measuring plate 32, the measuring plate 32 is rotationally connected with the measuring frame 31, the measuring plate 32 has a measuring end and an indicating end, the measuring end is rested on the side surface of the rod piece 4, and the indicating end is used to reflect the straightness of the rod piece 4.

[0028] The rod 4 is horizontally placed on the support unit 1, and the driving unit 2 drives the rod 4 to rotate around its own axis. When the rod 4 is bent, the middle bending part of the rod 4 actually moves in a circular motion around its theoretical axis, thereby pushing the measuring end of the measuring plate 32 placed thereon to move up and down. Since the measuring plate 32 is rotationally connected with the measuring frame 31, the measuring end will also swing together. The swing amplitude reflects the bending degree of the rod 4, that is, the larger the swing amplitude, the worse the straightness of the rod 4; the smaller the swing amplitude, the better the straightness of the rod 4.

[0029] The straightness measuring device for the elongated rod adopts the support unit 1 to carry the rod 4, and the flatness requirement of the support unit 1 is very low, which can greatly reduce the equipment measurement cost. At the same time, the support unit 1 can also carry the rod 4 by bypassing the lug and other structures at both ends of the rod 4, without the need to remove the lug before measurement, thereby simplifying the measurement operation and improving the measurement efficiency.

[0030] In some embodiments, the straightness measuring device for the elongated rod includes two support units 1 arranged at intervals, and the two support units 1 are completely the same. The two ends of the rod 4 are respectively placed on the two support units 1. It is easy to understand that when the lug and other structures are at both ends of the rod 4, the position where the support unit 1 is connected with the rod 4 can be moved inward by a distance to avoid the interference of the lug and other structures on the rotation of the rod 4. However, the position where the support unit 1 is connected with the rod 4 should be as close to the two ends of the rod 4 as possible, and close to the middle will reduce the bending amplitude of the bending part, resulting in a larger straightness error of the rod 4 measured. The measuring unit 3 is arranged between the two support units 1 and is used to measure the bending degree of the bending position in the middle of the rod 4.

[0031] In some embodiments, each support unit 1 includes a support frame 11 and two rollers 12, and the roller 12 is rotationally connected with the support frame 11, such as through a rotating shaft and a bearing, so that the roller 21 can rotate freely. The two rollers 21 are arranged side by side and the axes are parallel, and the rod 4 is placed on the two rollers 21.

[0032] In some embodiments, the support frame 11 has a mounting slide rail 111 arranged in the vertical direction, the mounting slide rail 111 is connected with the upper top surface of the support frame 11, the driving unit 2 is slidably connected with the mounting slide rail 111 of one of the support frames 11, and can be slid into or out of the mounting slide rail 111 from the upper end of the mounting slide rail 111, thereby realizing the connection and separation with the rod 4.

[0033] In some embodiments, the driving unit 2 comprises a connecting rod 21, a driving motor and a driving wheel 22, the connecting rod 21 is slidably connected with the support frame 11, that is, the connecting rod 21 has a structure matched with the mounting slide rail 111 and is embedded in the mounting slide rail 111. Preferably, in order to be more stable in connection, the support frame 11 has two opposite mounting slide rails 111, and the two ends of the connecting rod 21 are slidably connected with the two mounting slide rails 111 respectively. The driving motor is fixedly connected with the connecting rod 21, the driving shaft of the driving motor is coaxially fixedly connected with the driving wheel 22, and the driving wheel 22 abuts on the side surface of the rod piece 4. The driving motor drives the driving wheel 22 to rotate, and the driving wheel 22 drives the rod piece 4 to rotate through friction.

[0034] In some embodiments, the driving unit 2 further comprises a speed reducer, and the driving shaft of the driving motor is connected with the driving wheel 22 through the speed reducer. The speed reducer can reduce the speed of the driving shaft of the driving motor, so that the driving wheel 22 rotates at a slower speed, thereby driving the rod piece 4 to rotate at a slower speed, so that the indicating end shakes at a slower speed, and the measuring personnel can more clearly observe the shaking amplitude of the indicating end. The speed reducer can adopt a gear set, a belt pulley set or the like structure as long as it can reduce the speed.

[0035] In some embodiments, the driving unit 2 further comprises a storage battery, which is arranged on the connecting rod 21 and electrically connected with the driving motor to supply power for the driving motor. In other embodiments, the driving motor can also be powered by an external power supply.

[0036] In some embodiments, the driving unit 2 further comprises a counterweight 23 arranged on the connecting rod 21. The driving wheel 22 drives the rod piece 4 to rotate through friction, and the friction is positively correlated with the pressure. When the self-weight of the connecting rod 21, the driving motor and the driving wheel 22 is not enough, the friction between the driving wheel 22 and the rod piece 4 will be too small to cause slipping. The counterweight 23 is arranged to increase the pressure between the driving wheel 22 and the rod piece 4, so that the driving wheel 22 can normally transmit power.

[0037] In some embodiments, the measuring plate 32 is an isosceles triangle, the measuring end and the indicating end are respectively located at two base angles of the measuring plate 32, and the top angle of the measuring plate 32 is rotationally connected with the measuring frame 31.

[0038] In some embodiments, the measuring unit 3 further comprises a scale disc 33, which is fixedly connected with the measuring frame 31 and arranged close to the indicating end. The scale disc 33 has scales, and when the measuring plate 32 rotates, the indicating end can point to different positions on the scale disc 33. When the swinging angle of the indicating end on the scale disc 33 exceeds a threshold value, it indicates that the straightness of the rod piece 4 does not meet the standard and needs to be repaired.

[0039] In order to better understand the present application, the following will be combinedFigure 1 The technical solution of this utility model is described in detail below:

[0040] When measuring the straightness of rod 4, first place rod 4 on the rollers 12 of the two support units 1. Visually inspect the most curved point of rod 4 and place the measuring unit 3 at this point, with the measuring end of the measuring plate 32 resting on rod 4. If the most curved point of rod 4 cannot be visually detected, place the measuring unit 3 in the middle position of rod 4. Then start the drive motor, which drives rod 4 to rotate via drive wheel 22. During rotation, rod 4 pushes the measuring plate 32 to rotate, causing the indicator end to sway on the dial 33. Record the maximum sway amplitude of the indicator end. If this sway amplitude exceeds a preset threshold, it indicates that the straightness of rod 4 is substandard and needs repair. Conversely, if it does not exceed the threshold, it indicates that the straightness of rod 4 is up to standard and can continue to be used. To avoid errors, the measuring position of the measuring unit 3 on rod 4 can be adjusted, and multiple measurements can be taken. If any measurement fails to meet the standard, it indicates that the straightness of rod 4 is substandard. If all measurements meet the standard, it indicates that the straightness of the rod 4 meets the standard.

[0041] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A device for measuring the straightness of a slender rod, characterized in that, include: A support unit for supporting the horizontally placed rod; A drive unit is detachably connected to the rod to drive the rod to rotate around its own axis; The measuring unit includes a measuring frame and a measuring plate, the measuring plate being rotatably connected to the measuring frame, the measuring plate having a measuring end and an indicating end, the measuring end being rested on the side of the rod, and the indicating end being used to reflect the straightness of the rod.

2. The device for measuring the straightness of slender rods according to claim 1, characterized in that, The rod includes two spaced-apart support units, with both ends resting on the two support units respectively; the measuring unit is arranged between the two support units.

3. The device for measuring the straightness of slender rods according to claim 2, characterized in that, The support unit includes a support frame and two rollers. The rollers are rotatably connected to the support frame. The two rollers are arranged side by side with parallel axes and are used to support the rod.

4. The device for measuring the straightness of slender rods according to claim 3, characterized in that, The support frame has a vertically arranged mounting rail that connects to the top surface of the support frame, and the drive unit is slidably connected to one of the mounting rails of the support frame.

5. The device for measuring the straightness of slender rods according to claim 4, characterized in that, The drive unit includes a connecting rod, a drive motor, and a drive wheel. The connecting rod is slidably connected to the support frame. The drive motor is fixedly connected to the connecting rod. The drive shaft of the drive motor is coaxially fixedly connected to the drive wheel. The drive wheel abuts against the side of the rod and drives the rod to rotate through friction.

6. The device for measuring the straightness of slender rods according to claim 5, characterized in that, The drive unit also includes a reducer, and the drive shaft of the drive motor is connected to the drive wheel through the reducer.

7. The device for measuring the straightness of slender rods according to claim 5, characterized in that, The drive unit also includes a battery, which is mounted on the connecting rod and electrically connected to the drive motor to supply power to the drive motor.

8. The device for measuring the straightness of slender rods according to claim 5, characterized in that, The drive unit also includes a counterweight, which is disposed on the connecting rod.

9. The device for measuring the straightness of slender rods according to claim 1, characterized in that, The measuring unit also includes a scale, which is fixedly connected to the measuring frame and arranged near the indicating end; when the measuring plate rotates, the indicating end can point to different positions on the scale.

10. The device for measuring the straightness of slender rods according to claim 1, characterized in that, The measuring plate is an isosceles triangle, with the measuring end and the indicating end located at the two base corners of the measuring plate, and the apex corner of the measuring plate rotatably connected to the measuring frame.

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