Flatness testing fixture

Abstract

A flatness detection tool belongs to the technical field of chain wheel flatness detection tools and comprises a telescopic rod, a rotating rod, an angle scale, a pointer, a first clamping mechanism and a second clamping mechanism, one end of the telescopic rod is connected with the first clamping mechanism, the other end of the telescopic rod is hinged to one end of the rotating rod through a pin shaft, and the other end of the rotating rod is connected with the second clamping mechanism. The first clamping mechanism and the second clamping mechanism are used for clamping a driving chain wheel and a driven chain wheel in a chain transmission system respectively, an angle scale concentric with a pin shaft is arranged at the end of the outer surface of the telescopic rod, a pointer is arranged on the outer surface, where one side of the angle scale is located, of the rotating rod, and in the initial state, the telescopic rod and the rotating rod are coaxial. The measured driving chain wheel and the driven chain wheel are coplanar, and the pointer points to the zero scale of the angle scale. According to the utility model, whether the two chain wheels in the transmission system are in the same plane can be rapidly determined, the flatness error angle can be measured, the operation is simple, and the versatility is strong.

Description

Technical Field

[0001] The invention belongs to the technical field of sprocket flatness detection tools, and specifically relates to a flatness detection tool. Background Art

[0002] The chain drive system usually includes a driving sprocket, a driven sprocket and a chain. The flatness of the sprocket refers to the degree of deviation of the tooth surface or the connection surface of the driving sprocket and the driven sprocket relative to the axis. In theory, the driving sprocket and the driven sprocket are coplanar, which is the best assembly mode. However, during the installation of the sprocket, due to factors such as the sprocket mounting seat and the flatness of the sprocket itself, the two sprockets may not be coplanar. Installing the chain on two non-coplanar sprockets will generate noise during operation, aggravate the wear of the sprocket and chain, and even directly break the chain in the case of a large difference in flatness, causing an accident.

[0003] The efficiency and reliability of the chain drive system are directly affected by the flatness error of the sprocket, especially under high-precision and high-speed operation requirements. Accurately measuring and controlling the flatness error between sprockets is a key step to ensure the stability and performance of the transmission system. Traditional measurement methods have problems such as inability to read (determine the deviation angle through reading), complex operation, poor versatility, low measurement efficiency, and poor measurement accuracy. Especially in the environment of high-precision requirements and mass production, faster and more accurate detection tools are needed to improve production efficiency and product quality. Utility Model Content

[0004] In view of the problems of the prior art, the present invention discloses a flatness inspection tool, which can not only quickly determine whether two sprockets in a transmission system are in the same plane, but also measure the flatness error angle.

[0005] To achieve the above purpose, the novel technical solution used is:

[0006] A flatness inspection tool comprises a telescopic rod, a rotating rod, an angle disk, a pointer, a first clamping mechanism and a second clamping mechanism, wherein one end of the telescopic rod is connected to the first clamping mechanism, and the other end is hinged to one end of the rotating rod through a pin, and the other end of the rotating rod is connected to the second clamping mechanism, and the first clamping mechanism and the second clamping mechanism are respectively used to clamp a driving sprocket and a driven sprocket in a chain transmission system, an angle disk concentric with the pin is provided on the end of the outer surface of the telescopic rod, and a pointer is provided on the outer surface of the rotating rod where one side of the angle disk is located, and in an initial state, the telescopic rod is coaxial with the rotating rod, the measured driving sprocket and driven sprocket are coplanar, and the pointer points to the 0 scale of the angle disk.

[0007] Preferably, the telescopic rod includes a sleeve and a sliding rod slidably connected to the sleeve, a first extension plate is integrally formed on one side of the outer end of the sliding rod, a first clamping plate is arranged on the opposite side of the first extension plate, the first clamping plate and the first extension plate are connected by two first bolts to form a first clamping mechanism, the first bolt passes through through holes relatively arranged on the first extension plate and the first clamping plate, and is locked by a first nut when clamping the sprocket.

[0008] Preferably, a second extension plate is arranged on the same side of the outer end of the rotating rod as the first extension plate, and a second clamping plate is arranged on the opposite side of the second extension plate. The second clamping plate and the second extension plate are connected by two second bolts to form a second clamping mechanism. The second bolts pass through through holes relatively arranged on the second extension plate and the second clamping plate, and are locked by a second nut when clamping the sprocket.

[0009] Preferably, the cross-sections of the sleeve, the slide rod and the rotating rod are all rectangular, and the cross-sectional dimensions of the slide rod and the rotating rod are the same.

[0010] Preferably, the top or bottom of the first clamping plate and the second clamping plate respectively extends upward or downward to form an arc-shaped protrusion.

[0011] Preferably, the pin shaft vertically penetrates the upper and lower end surfaces of the sleeve and the rotating rod. In an initial state, the 0 scale line of the angle disk, the axis of the pin shaft and the common axis of the telescopic rod and the rotating rod are coplanar.

[0012] Preferably, the driving sprocket and the driven sprocket have the same pitch P, and the maximum extension length L1 of the telescopic rod and the length L2 of the rotating rod satisfy the relationship with the pitch P: L1+L2=(25-55)*P.

[0013] Preferably, the lengths of the first bolt and the second bolt are the same, both are D, the thicknesses of the first extension plate and the second extension plate are the same, both are D1, the thicknesses of the first clamping plate and the second clamping plate are the same, both are D2, and the thicknesses of the driving sprocket and the driven sprocket are the same, both are D3, then the relationship is satisfied: D=D1+D2+D3+8mm.

[0014] The beneficial effects of the new flatness inspection tool are:

[0015] The traditional method can only determine whether the sprockets are in the same plane, but cannot measure the flatness error angle. The new method improves the measurement accuracy and reliability through a fixed and intuitive measurement method, and can directly measure the flatness error angle. Moreover, the new method is applied to sprockets of various sizes and types, which improves the versatility and practicality of the inspection fixture. It adopts more intuitive and simplified operating steps, reduces the skill requirements and operation complexity of the operator, thereby improving production efficiency. The new design enables the measurement results to be quickly fed back to the production line, which helps to adjust and improve the production process in a timely manner, thereby reducing quality risks and costs in the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional image of a flatness check fixture;

[0017] Figure 2 It is a front view of a flatness inspection fixture;

[0018] Figure 3 It is a partial view of a flatness gauge;

[0019] Figure 4 This is a left view of a flatness gauge;

[0020] Figure 5 It is a partial view of a flatness gauge;

[0021] Figure 6 It is a schematic diagram of the use principle of a flatness gauge.

[0022] 1. first bolt; 2. sliding rod; 3. sleeve; 4. angle plate; 5. pointer; 6. rotating rod; 7. first nut; 8. pin shaft; 9. second clamping plate; 10. driven sprocket; 11. second nut; 12. second extension plate; 13. driving sprocket. DETAILED DESCRIPTION

[0023] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0024] The following embodiments may be understood as a part of a local structure or method that is expressed separately in the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0025] Example 1

[0026] A flatness gauge, such as Figure 1-5As shown, it includes a telescopic rod, a rotating rod 6, an angle disk 4, a pointer 5, a first clamping mechanism, and a second clamping mechanism. One end of the telescopic rod is connected to the first clamping mechanism, and the other end is hinged to one end of the rotating rod 6 through a pin 8. The other end of the rotating rod 6 is connected to the second clamping mechanism. The first clamping mechanism and the second clamping mechanism are respectively used to clamp the driving sprocket and the driven sprocket in the chain transmission system. The outer surface end of the telescopic rod is provided with an angle disk 4 concentric with the pin 8, and the outer surface of the rotating rod 6 where one side of the angle disk 4 is located is provided with a pointer 5. In the initial state, the telescopic rod is coaxial with the rotating rod 6, the measured driving sprocket and the driven sprocket are coplanar, and the pointer 5 points to the 0 scale of the angle disk 4.

[0027] In this embodiment, when in use, the first clamping mechanism and the second clamping mechanism clamp the driving sprocket and the driven sprocket respectively, and the telescopic rod is adaptively adjusted in length. The flatness deviation of the driving sprocket and the driven sprocket can be read according to the scale on the angle disk 4 indicated by the pointer 5.

[0028] It must be explained that in the chain drive system targeted by the present invention, the angle deviations involved are mostly very small angle deviations. If the deviation is too large, the chain cannot be installed. Therefore, when using this tool, there will be no situation where the present invention cannot be used due to excessive flatness deviation between the driving sprocket and the driven sprocket. In the process of clamping the driving sprocket and the driven sprocket, the telescopic rod can be adaptively adjusted in length to adjust the position of the pin to a suitable position that can clamp the two sprockets. As for the situation where the two sprockets are parallel to each other but misaligned front and back, it is not applicable to the present invention. In the actual installation, the flatness detection of the motorcycle sprocket targeted by the present invention does not have this situation due to the limitation of the axis. There is only a situation where the driven sprocket is tilted relative to the driving sprocket.

[0029] Example 2

[0030] like Figure 1-5 As shown, the telescopic rod includes a sleeve 3 and a slide rod 2 slidably connected to the sleeve 3, a first extension plate is integrally formed on one side of the outer end of the slide rod 2, a first clamping plate is arranged on the opposite side of the first extension plate, the first clamping plate and the first extension plate are connected by two first bolts 1 to form a first clamping mechanism, the first bolt 1 passes through the through holes relatively arranged on the first extension plate and the first clamping plate, and is locked by the first nut 7 when clamping the sprocket.

[0031] like Figure 1-5 As shown, a second extension plate 12 is arranged on the same side as the first extension plate at the outer end of the rotating rod 6, and a second clamping plate 9 is arranged on the opposite side of the second extension plate 12. The second clamping plate 9 and the second extension plate 12 are connected by two second bolts to form a second clamping mechanism. The second bolts pass through the through holes relatively arranged on the second extension plate and the second clamping plate, and are locked by the second nut 11 when clamping the sprocket.

[0032] Example 3

[0033] like Figure 1 As shown, the cross-sections of the sleeve 3, the slide rod 2, and the rotating rod 6 are all rectangular, and the cross-sectional dimensions of the slide rod 2 and the rotating rod 6 are the same.

[0034] like Figure 4 As shown, the top or bottom of the first clamping plate and the second clamping plate 9 respectively extend upward or downward to form an arc-shaped protrusion, which is convenient for clamping the sprocket.

[0035] like Figure 1 As shown, the pin shaft 8 vertically penetrates the upper and lower end surfaces of the sleeve 3 and the rotating rod 6. In the initial state, the 0 scale line of the angle disk 4, the axis of the pin shaft 8 and the common axis of the telescopic rod and the rotating rod 6 are coplanar.

[0036] Example 4

[0037] like Figure 4 , 6 As shown, the driving sprocket 13 and the driven sprocket 10 have the same pitch P, and the limit length L1 of the telescopic rod and the length L2 of the rotating rod 6 satisfy the relationship with the pitch P: L1+L2=(25~55)*P. Under normal circumstances, the distance between the axes of the two sprockets of a motorcycle is 30-40P. The above arrangement can cover the flatness detection of the chain transmission system of the motorcycle. Among them, the limit length L1 refers to the shortest length and the longest length of the telescopic rod.

[0038] Example 5

[0039] like Figure 1-5 As shown, the lengths of the first bolt 1 and the second bolt are the same, both are D, the thicknesses of the first extension plate and the second extension plate 12 are the same, both are D1, the thicknesses of the first clamping plate and the second clamping plate 9 are the same, both are D2, the thicknesses of the driving sprocket 13 and the driven sprocket 10 are the same, both are D3, then the relationship is satisfied: D=D1+D2+D3+8mm.

[0040] Example 6

[0041] To ensure that the sprocket is clamped to the same extent, the first clamping plate and the second clamping plate should clamp the sprocket with the same force, and during the clamping process, the torque value that the first nut 7 and the second nut need to apply is ≥5N.

[0042] The use principle of this new type: Figure 6 As shown, the first clamping mechanism and the second clamping mechanism clamp the driving sprocket or the driven sprocket respectively, and the telescopic rod adaptively adjusts its own length. At this time, the angle dial scale pointed by the pointer is the flatness difference between the driving sprocket and the driven sprocket.

Claims

1. A flatness gauge, characterized by: It includes a telescopic rod, a rotating rod, an angle disk, a pointer, a first clamping mechanism, and a second clamping mechanism. One end of the telescopic rod is connected to the first clamping mechanism, and the other end is hinged to one end of the rotating rod through a pin shaft. The other end of the rotating rod is connected to the second clamping mechanism. The first clamping mechanism and the second clamping mechanism are respectively used to clamp the driving sprocket and the driven sprocket in the chain transmission system. The outer surface end of the telescopic rod is provided with an angle disk concentric with the pin shaft, and the outer surface of the rotating rod where one side of the angle disk is located is provided with a pointer. In the initial state, the telescopic rod is coaxial with the rotating rod, the measured driving sprocket and the driven sprocket are coplanar, and the pointer points to the 0 scale of the angle disk.

2. A flatness gauge as claimed in claim 1, characterized in that: The telescopic rod includes a sleeve and a sliding rod slidably connected to the sleeve. A first extension plate is integrally formed on one side of the outer end of the sliding rod. A first clamping plate is arranged on the opposite side of the first extension plate. The first clamping plate and the first extension plate are connected by two first bolts to form a first clamping mechanism. The first bolt passes through through holes relatively arranged on the first extension plate and the first clamping plate, and is locked by a first nut when clamping the sprocket.

3. A flatness gauge as claimed in claim 2, characterized in that: A second extension plate is arranged on the same side of the outer end of the rotating rod as the first extension plate, and a second clamping plate is arranged on the opposite side of the second extension plate. The second clamping plate and the second extension plate are connected by two second bolts to form a second clamping mechanism. The second bolts pass through through holes relatively arranged on the second extension plate and the second clamping plate, and are locked by a second nut when clamping the sprocket.

4. A flatness gauge as claimed in claim 3, characterized in that: The cross sections of the sleeve, the slide rod and the rotating rod are all rectangular, and the cross section dimensions of the slide rod and the rotating rod are the same.

5. A flatness gauge as claimed in claim 4, characterized in that: The tops or bottoms of the first clamping plate and the second clamping plate extend upward or downward respectively to form arc-shaped protrusions.

6. A flatness gauge as claimed in claim 5, characterized in that: The pin shaft vertically penetrates the upper and lower end surfaces of the sleeve and the rotating rod. In the initial state, the 0 scale line of the angle disk, the axis of the pin shaft and the common axis of the telescopic rod and the rotating rod are coplanar.

7. A flatness gauge as claimed in claim 6, characterized in that: The driving sprocket and the driven sprocket have the same pitch P, and the extension limit length L1 of the telescopic rod and the length L2 of the rotating rod satisfy the relationship with the pitch P: L1+L2=(25-55)*P.

8. A flatness gauge as claimed in claim 7, characterized in that: The lengths of the first bolt and the second bolt are the same, both are D, the thicknesses of the first extension plate and the second extension plate are the same, both are D1, the thicknesses of the first clamping plate and the second clamping plate are the same, both are D2, the thicknesses of the driving sprocket and the driven sprocket are the same, both are D3, then the relationship is satisfied: D=D1+D2+D3+8mm.

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