A precision measuring device for conveniently measuring symmetry of a double helical gear

Abstract

The present application relates to a kind of precision measuring device for conveniently measuring the symmetry of herringbone gear, belong to the field of measuring equipment.The present application solves the technical problems that measurement instrument is difficult to operate when measuring the symmetry of herringbone gear, is susceptible to space limitation, is not convenient to carry and measure.The bottom plate of the present application is horizontally placed, the back plate is fixedly connected to the upper end rear side of the bottom plate, the standard pointer is fixedly connected to the rear end face of the lower part of the back plate, the standard pointer is located at the middle position between the two side plates, the holding rod is slidably connected to the left and right sides of the rear end of the measuring plate respectively, the measuring spring is arranged between the measuring plate and the holding rod, the center pointer is always located at the middle position between the two holding rods, the standard scale is opened in cooperation, the measuring slide is slidably connected to the measuring plate in horizontal direction, the measuring pointer is provided on the measuring slide, and the measuring scale is arranged in cooperation, and the measuring rod is connected to the bottom of the measuring slide.The operation is simple, and it is easy to use.The present application is used for the measurement of the symmetry of herringbone gear.

Description

Technical Field

[0001] This invention relates to a precise measuring device for conveniently measuring the symmetry of herringbone gears, belonging to the field of measuring instruments. Background Technology

[0002] Herringbone gears consist of two symmetrical helical gears with opposite directions. They are used to counteract the lateral force exerted on the shaft by the helical gears during transmission. They have a high degree of overlap during transmission, with at least two teeth meshing at any given time. During transmission, because the helix angles of the teeth are opposite in the symmetrical direction, there is little or no axial force, resulting in high load-bearing capacity and smooth operation. In the production process of herringbone gears, the symmetry of the herringbone gears is very important to ensure meshing and transmission performance.

[0003] Currently, coordinate measuring machines (CMMs) are commonly used in production to measure the symmetry of herringbone gears. However, CMMs have many mechanical parts, resulting in high equipment costs. They are also difficult to operate when measuring workpieces, requiring a large amount of space and are subject to site limitations. Furthermore, they are inconvenient to carry and use when needed, making them difficult for users to perform measurements.

[0004] Measuring the symmetry of herringbone gears presents technical challenges, including difficulties in operating the measuring instruments, spatial limitations, inconvenience in carrying them, and inconvenience for users. Summary of the Invention

[0005] The present invention aims to solve the technical problems of difficult operation, space limitations, inconvenience in carrying and measurement of herringbone gears when measuring the symmetry of the measuring instruments, and provides a precise measuring device for convenient measurement of the symmetry of herringbone gears.

[0006] The present invention provides a precise measuring device for conveniently measuring the symmetry of a herringbone gear. A base plate is placed horizontally, with a back plate fixedly connected to the rear side of its upper end. The back plate is perpendicular to the base plate. A standard pointer is fixedly connected to the rear end face of the lower part of the back plate. Side plates are slidably connected to the left and right sides of the upper end of the base plate, and the two side plates move synchronously inward or outward. The herringbone gear is horizontally fixed axially between the two side plates. The standard pointer is located at the middle position between the two side plates. A measuring plate is horizontally positioned above the two side plates. Holding rods are slidably connected to the left and right sides of the rear end of the measuring plate, and the two holding rods move synchronously inward or outward. The lower ends of the two holding rods are located at the outer ends of the two sides of the herringbone gear. A measuring spring is provided between the measuring plate and the holding rods, providing clamping force for the herringbone gear. A center pointer is slidably connected laterally to the rear end face of the upper end of the back plate, and the center pointer is always located at the middle position between the two holding rods. The standard pointer and the center pointer are respectively provided with standard scales on the back plate surface. The upper end of the measuring plate is horizontally connected to two measuring sliders. The bottom of the two measuring sliders is fixedly connected to measuring rods. The measuring rods extend into the tooth grooves on both sides of the herringbone gear. The front and rear sides of the inner end of the measuring slider are respectively fixedly connected to measuring pointers. The upper surface of the measuring plate corresponding to the measuring pointers is provided with measuring scales.

[0007] As another improvement of the present invention, transverse connecting grooves are respectively provided on the left and right sides of the upper end of the base plate, and the connecting slider is slidably connected to the connecting grooves respectively. The bottom of the side plate is fixedly connected to the inner side of the connecting slider, the outer side of the connecting slider is fixedly connected to one end of the spring, and the other end of the spring is fixedly connected to the inner wall of the connecting groove.

[0008] As another improvement of the present invention, a first rack is fixedly connected to the left and right sides of the rear end of the side plate, and a first gear meshes between the two first racks. A fixed shaft is rotatably connected to the middle of the first gear. The fixed shaft is fixedly connected to the back plate, and the rear end of the fixed shaft is fixedly connected to the standard pointer.

[0009] As another improvement of the present invention, a second rack is fixedly connected to the rear end of the retaining rod, a second gear meshes between the two second racks, a displacement slider is rotatably connected to the middle of the second gear, a transverse displacement groove is opened on the surface of the back plate corresponding to the displacement slider, the displacement slider is slidably connected to the displacement groove, the two second racks are slidably connected to the displacement slider respectively, and the center pointer is fixedly connected to the rear end of the displacement slider.

[0010] As another improvement of the present invention, mounting grooves are respectively provided on the left and right sides of the rear end of the measuring plate, and mounting sliders are respectively fixedly connected to the upper front side of the retaining rod. The mounting sliders are slidably connected to the mounting grooves, and the outer side of the mounting slider is fixedly connected to one end of the measuring spring, and the other end of the measuring spring is fixedly connected to the inner wall of the mounting groove.

[0011] As another improvement of the present invention, each of the two side plates is provided with a longitudinal adjusting groove, and an adjusting slider that moves up and down is slidably connected inside the adjusting groove. A fixing device is installed on the inner side of each adjusting slider. The herringbone gear is installed between the two side plates through the fixing device. Support springs are fixedly connected to the front and rear sides of the bottom of the adjusting slider, and the bottom of the support springs is fixedly connected to the inner wall of the adjusting groove. A positioning frame is fixedly connected to the front end of each adjusting slider. A positioning bolt is threaded to the front end of each positioning frame. A positioning plate is rotatably connected to the rear end of each positioning bolt. The positioning plates are located at the front end of each side plate.

[0012] As another improvement of the present invention, the mounting screw passes through the adjusting slider and is rotatably connected to the middle of the adjusting slider. The control knob is fixedly connected to the left end of the mounting screw, and the mounting block is fixedly connected to the right end of the mounting screw. A fixing plate is installed on the outer surface of the mounting block, and the fixing plate is located inside the hole of the herringbone gear.

[0013] As another improvement of the present invention, the mounting block and the fixing plate are hinged by a first hinge plate and a second hinge plate. The surface of the second hinge plate is hinged to one end of the support plate. The surface of the mounting screw is threaded with a fixing knob. The inner end of the fixing knob is rotatably connected to the inner surface of the mounting ring. The outer surface of the mounting ring is hinged to the other end of the support plate.

[0014] As another improvement of the present invention, a plurality of auxiliary grooves are respectively formed on the circumferential surface of the control knob. Attached Figure Description

[0015] Figure 1 This is a first schematic diagram of the overall structure of a precise measuring device for facilitating the measurement of the symmetry of herringbone gears according to the present invention.

[0016] Figure 2 This is a second schematic diagram of the overall structure of a precise measuring device for facilitating the measurement of the symmetry of herringbone gears according to the present invention.

[0017] Figure 3 This is a first schematic diagram of the fixing device structure of a precision measuring device for conveniently measuring the symmetry of herringbone gears according to the present invention.

[0018] Figure 4This is a second schematic diagram of the fixing device structure of a precise measuring device for facilitating the measurement of the symmetry of herringbone gears according to the present invention.

[0019] Figure 5 This is a schematic diagram of the adjusting slider installation structure of a precise measuring device for facilitating the measurement of the symmetry of herringbone gears according to the present invention.

[0020] Figure 6 This is a schematic diagram of the meshing structure of the first rack and the first gear in a precise measuring device for conveniently measuring the symmetry of herringbone gears according to the present invention.

[0021] Figure 7 This is a schematic diagram of the mounting structure of the measuring slider of a precision measuring device for conveniently measuring the symmetry of herringbone gears according to the present invention.

[0022] Figure 8 This is a schematic diagram of the meshing structure of the second rack and the second gear in a precise measuring device for facilitating the measurement of the symmetry of herringbone gears according to the present invention.

[0023] In the diagram: 1-Base plate, 2-Side plate, 3-Herringbone gear, 4-Mounting spring, 5-Supporting spring, 6-Measuring plate, 7-Adjusting slider, 8-Control knob, 9-Back plate, 10-Standard pointer, 11-Center pointer, 12-Standard scale, 13-Measuring scale, 14-Mounting block, 15-Fixing plate, 16-First hinge plate, 17-Second hinge plate, 18-Support plate, 19-Fixing knob, 20-Mounting ring, 21-Mounting screw, 22-Positioning frame, 23-Positioning bolt, 24-Positioning plate, 25-Fixing shaft, 26-First rack, 27-First gear, 29-Measuring slider, 30-Measuring rod, 31-Measuring pointer, 32-Holding rod, 33-Measuring spring, 34-Second rack, 35-Second gear, 36-Displacement slider. Detailed Implementation

[0024] Specific implementation method one: Combining Figure 1 and Figure 2This embodiment describes a precise measuring device for conveniently measuring the symmetry of a herringbone gear. It includes a base plate 1, side plates 2, a herringbone gear 3, a measuring plate 6, a back plate 9, a standard pointer 10, a center pointer 11, a standard scale 12, a measuring scale 13, a retaining rod 32, a measuring spring 33, a measuring slider 29, a measuring rod 30, and a measuring pointer 31. The base plate 1 is placed horizontally, and the back plate 9 is fixedly connected to the rear side of the upper end of the base plate 1. The back plate 9 is perpendicular to the base plate 1. The standard pointer 10 is fixedly connected to the rear end face of the lower part of the back plate 9. Side plates 2 are slidably connected to the left and right sides of the upper end of the base plate 1, respectively. The two side plates 2 move synchronously inward or outward. The herringbone gear 3 moves along... The axial horizontal fixing is between the two side plates 2. The standard pointer 10 is located in the middle position between the two side plates 2. The measuring plate 6 is horizontally set above the two side plates 2. The left and right sides of the rear end of the measuring plate 6 are respectively slidably connected to the retaining rods 32. The two retaining rods 32 move inward or outward synchronously. The lower ends of the two retaining rods 32 are respectively located at the outer ends of the two sides of the herringbone gear 3. A measuring spring 33 is set between the measuring plate 6 and the retaining rods 32. The measuring spring 33 provides the retaining rods 32 with the clamping force on the herringbone gear 3. The center pointer 11 is laterally slidably connected to the rear end face of the upper part of the back plate 9. The center pointer 11 is always located in the middle position between the two retaining rods 32. The standard pointer 10 and the center pointer 11 are respectively provided with standard scales 12 on the surface of the back plate 9. The upper end of the measuring plate 6 is horizontally connected to two measuring sliders 29. The bottom of the two measuring sliders 29 is respectively fixedly connected to measuring rods 30. The measuring rods 30 extend into the tooth grooves on both sides of the herringbone gear 3. The front and rear sides of the inner end of the measuring slider 29 are respectively fixedly connected to measuring pointers 31. The upper surface of the measuring plate 6 corresponding to the measuring pointers 31 is provided with measuring scales 13.When using this device, both the standard scale 12 and the measuring scale 13 are set to micrometer scales. The herringbone gear 3 is installed between two retaining rods 32, and the measuring spring 33 provides clamping force to make the retaining rods 32 fit against both ends of the herringbone gear 3. At this time, the position of the center pointer 11 is the center line of the herringbone gear 3. When the two side plates 2 are moved synchronously inward to clamp the herringbone gear 3, if the selected herringbone gear 3 is symmetrical, the herringbone gear 3 will not move when clamped by the two side plates 2. If the two parts of the herringbone gear 3 are asymmetrical around the center line, when the two side plates 2 move synchronously towards the herringbone gear 3, the herringbone gear 3 will not move. 2. During the extrusion process, one of the side plates 2 will first contact the end face of the herringbone gear 3. In order to ensure that the inner ends of both side plates 2 can be tightly attached to both ends of the herringbone gear 3, the herringbone gear 3 will be displaced during the synchronous movement of the two side plates 2. Under the elastic force of the measuring spring 33, the two retaining rods 32 will move synchronously with the herringbone gear 3, causing the center pointer 11 to deviate. At this time, the distance by which the center pointer 11 is displaced is twice the distance difference between the two ends of the herringbone gear 3 and the standard line when the center line of the herringbone gear 3 coincides with the standard line corresponding to the standard pointer 10. This is the symmetry of the two sides of the herringbone gear 3. At this time, the standard scale 1 indicated by the center pointer 11 is observed. The symmetry of the herringbone gear 3 can be determined by measuring the helical teeth on both sides of the surface of the herringbone gear 3. The operation is simple and convenient. When measuring the helical teeth on both sides of the surface of the herringbone gear 3, the two measuring sliders 29 can be joined together and the inner sides of the two measuring sliders 29 can be aligned with the center line of the measuring scale 13. The measuring rod 30 should be in close contact with the inner wall of the inclined groove. Then, the measurement is performed by rotating the herringbone gear 3. Under the action of the helical teeth on both sides of the surface of the herringbone gear 3, when the herringbone gear 3 rotates, the measuring slider 29 can be moved by the helical teeth pushing the measuring rod 30, and the measuring pointer 31 can be moved to indicate the measuring scale 13. At this time, the measuring scale 13 indicated by the measuring pointer 31 is the value of the distance of each point of the inclined groove from the center line. During the process, if the helical teeth on both sides are symmetrically arranged, the moving distance of the two measuring sliders 29 is the same, and the measuring scale 13 indicated by the measuring pointer 31 is also equal. If the helical teeth on both sides are not completely symmetrical, the measuring scale 13 indicated by the measuring pointer 31 will change accordingly during the movement of the two measuring sliders 29. When the herringbone gear 3 rotates, after the measuring rod 30 is completely moved out of the corresponding helical teeth, the herringbone gear 3 is rotated 180 degrees, and then the measuring rod 30 is placed back into the corresponding two helical grooves. The herringbone gear 3 is rotated again for measurement. After the measurement is completed, twice the maximum value of the two measurements is taken as the symmetry of the helical teeth on the surface of the herringbone gear 3.

[0025] Specific Implementation Method Two: Combining Figure 1 and Figure 2This embodiment differs from specific embodiment one in that it further includes a mounting spring 4, a connecting slider, and a connecting groove. Horizontal connecting grooves are respectively formed on the left and right sides of the upper end of the base plate 1. The connecting slider is slidably connected to each of the connecting grooves. The bottom of the side plate 2 is fixedly connected to the inner side of the connecting slider, and the outer side of the connecting slider is fixedly connected to one end of the mounting spring 4. The other end of the mounting spring 4 is fixedly connected to the inner wall of the connecting groove. The mounting spring 4 is used to push the side plates 2 on both sides to move inward, thus supporting the herringbone gear 3. Other components and connection methods are the same as in specific embodiment one.

[0026] Specific implementation method three: Combining Figure 1 , Figure 2 and Figure 6 This embodiment differs from specific embodiment one in that it further includes a fixed shaft 25, a first rack 26, and a first gear 27. The left and right sides of the rear end of the side plate 2 are respectively fixedly connected to the first rack 26, and a first gear 27 meshes between the two first racks 26. The fixed shaft 25 is rotatably connected to the middle of the first gear 27. The fixed shaft 25 is fixedly connected to the back plate 9, and the rear end of the fixed shaft 25 is fixedly connected to the standard pointer 10. The synchronous inward movement of the two side plates 2, through the meshing of the two first racks 26 and the first gear 27, improves the linkage effect of the two side plates 2 and ensures that the middle position of the two side plates 2 remains collinear with the standard pointer 10 during movement. This facilitates user operation and measurement, and is applicable to herringbone gears 3 of different sizes, with a wide range of applications. Other components and connection methods are the same as in specific embodiment one or two.

[0027] Specific implementation method four: Combination Figure 1 , Figure 2 , Figure 6 and Figure 8This embodiment differs from specific embodiment one in that it further includes a second rack 34, a second gear 35, a displacement slider 36, and a displacement groove. The rear ends of the two retaining rods 32 are respectively fixedly connected to the second rack 34. A second gear 35 meshes between the two second racks 34. The displacement slider 36 is rotatably connected to the middle of the second gear 35. A transverse displacement groove is formed on the surface of the back plate 9 corresponding to the displacement slider 36. The displacement slider 36 is slidably connected to the displacement groove. The two second racks 34 are slidably connected to the displacement slider 36. The center pointer 11 is fixedly connected to the rear end of the displacement slider 36. The meshing of the two second racks 34 and the second gear 35 improves the linkage effect of the two retaining rods 32. The sliding connection between the second racks 34 and the displacement slider 36 maintains the stability of the measuring plate 6 during use. Furthermore, when the side plate 2 and the herringbone gear 3 are pressed together, the sliding connection between the displacement slider 36 and the back plate 9 allows the herringbone gear 3 to maintain a certain displacement distance, facilitating the measurement of the herringbone gear 3. Other components and connection methods are the same as any one of the specific embodiments one to three.

[0028] Specific Implementation Method Five: Combining Figure 1 , Figure 2 and Figure 6 This embodiment differs from specific embodiment one in that it further includes mounting grooves and mounting sliders. Mounting grooves are respectively formed on the left and right sides of the rear end of the measuring plate 6. Mounting sliders are fixedly connected to the upper front side of the retaining rod 32, and are slidably connected to the mounting grooves. The outer side of the mounting slider is fixedly connected to one end of the measuring spring 33, and the other end of the measuring spring 33 is fixedly connected to the inner wall of the mounting groove. The mounting grooves provide mounting space for the mounting sliders and the measuring spring 33, ensuring stable movement of the mounting sliders while also protecting the measuring spring 4, thus ensuring the normal use of the measuring spring 33. Other components and connection methods are the same as any one of specific embodiments one to four.

[0029] Specific Implementation Method Six: Combination Figure 1 , Figure 2 , Figure 5 and Figure 6This embodiment differs from specific embodiment one in that it further includes an adjusting groove, an adjusting slider 7, a fixing device, a support spring 5, a positioning frame 22, a positioning bolt 23, and a positioning plate 24. Each of the two side plates 2 has a longitudinal adjusting groove. An adjusting slider 7, which moves vertically, is slidably connected inside the adjusting groove. A fixing device is installed on the inner side of each adjusting slider 7. The herringbone gear 3 is installed between the two side plates 2 via the fixing device. Support springs 5 ​​are fixedly connected to the front and rear sides of the bottom of each adjusting slider 7. The bottom of each support spring 5 is fixedly connected to the inner wall of the adjusting groove. A positioning frame 22 is fixedly connected to the front end of each adjusting slider 7. A positioning bolt 23 is threadedly connected to the front end of each positioning frame 22. A positioning plate 24 is rotatably connected to the rear end of each positioning bolt 23. The positioning plates 24 are located at the front end of each side plate 2. The fixing device facilitates the installation of the herringbone gear 3 and can rotate during use. This allows the herringbone gear 3 to rotate when measuring the helical teeth on both sides. During installation, the fixing device moves up and down with the adjusting slider 7, allowing for height adjustment based on different herringbone gear 3 sizes. The support spring 5 assists the user in moving the adjusting slider 7 upwards for easy adjustment. The positioning bolt 23 secures the adjusting slider 7, facilitating measurement of the herringbone gear 3. During use, the positioning bolt 23 strengthens the pressure between the positioning plate 24 and the side plate 2, thus securing the adjusting slider 7 and improving user convenience. Other components and connection methods are the same as in any one of embodiments one to five.

[0030] Specific implementation method seven: Combining Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 This embodiment differs from specific embodiment one in that it also includes a control knob 8. The fixing device includes a mounting screw 21, a mounting block 14, and a fixing plate 15. The mounting screw 21 passes through the adjusting slider 7 and is rotatably connected to the middle of the adjusting slider 7. The control knob 8 is fixedly connected to the left end of the mounting screw 21, and the mounting block 14 is fixedly connected to the right end of the mounting screw 21. The fixing plate 15 is mounted on the outer surface of the mounting block 14 and is located inside the hole of the herringbone gear (3). Other components and connection methods are the same as any one of specific embodiments one to six.

[0031] Specific implementation method eight: Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 This embodiment differs from specific embodiment one in that it further includes a first hinge plate 16, a second hinge plate 17, a fixing knob 19, and a mounting ring 20. The mounting block 14 and the fixing plate 15 are hinged together by the first hinge plate 16 and the second hinge plate 17. The surface of the second hinge plate 17 is hinged to one end of the support plate 18. The surface of the mounting screw 21 is threadedly connected to the fixing knob 19. The inner end of the fixing knob 19 is rotatably connected to the inner surface of the mounting ring 20, and the outer surface of the mounting ring 20 is hinged to the other end of the support plate 18. The fixing knob 19 is used to control the outward expansion and retraction of multiple fixing plates 15. During use, it can be adjusted according to the diameter of the herringbone gear 3's hole. When installing the herringbone gear 3, the fixing control knob 8 can be used to fix the mounting screw 21. Then, by rotating the fixing knob 19, the multiple fixing plates 15 are adjusted to retract to a range that accommodates the diameter of the herringbone gear 3's hole. Then, by reversing the fixing knob 19, the threaded connection between the fixing knob 19 and the mounting screw 21 allows the fixing knob 19 to move axially on the surface of the mounting screw 21. Then, the fixed knob 19 moves, causing the first hinge plate 16 and the second hinge plate 17 to swing inward synchronously under the push of the support plate 18. This pushes the support plate 18 upward to press against the bore of the herringbone gear 3, thus fixing the herringbone gear 3. The outer ends of the fixed plate 15 are respectively provided with protruding plates for fitting against the end face of the herringbone gear, facilitating the limiting and measurement of the herringbone gear. Rotating the control knob 8 can drive the mounting screw 21 to rotate, thereby driving the herringbone gear 3 to rotate. Other components and connection methods are the same as any one of the specific embodiments one to seven.

[0032] Specific Implementation Method Nine: Combining Figure 3 This embodiment differs from specific embodiment one in that the circumferential surface of the control knob 8 is provided with multiple auxiliary grooves. These grooves facilitate user operation and rotation of the control knob 8. Other components and connection methods are the same as in any one of specific embodiments one through eight.

[0033] Combination Figures 1 to 8 Explanation of the working principle of this invention:

[0034] In use, the herringbone gear is installed between two side plates via a fixing device. The two side plates move synchronously toward the herringbone gear. The distance the center pointer moves at this time is the symmetry of the two sides of the herringbone gear. When measuring the helical teeth on both sides of the herringbone gear surface, the two measuring sliders are joined together, and the inner sides of the two measuring sliders are aligned with the center line of the measuring scale. The measuring rod is pressed tightly against the inner wall of the inclined groove. Then, the herringbone gear is rotated by turning the control knob to perform the measurement. When the herringbone gear rotates, it will drive the measuring slider to move under the action of the helical teeth pushing the measuring rod, and drive the measuring pointer to indicate the measuring scale. At this time, the measuring scale indicated by the measuring pointer is the value of each point of the inclined groove from the center line, thereby measuring the symmetry of the helical teeth on the surface of the herringbone gear.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A precise measuring device for conveniently measuring the symmetry of herringbone gears, characterized in that... It includes a base plate (1), a side plate (2), a herringbone gear (3), a measuring plate (6), a back plate (9), a standard pointer (10), a center pointer (11), a standard scale (12), a measuring scale (13), a holding rod (32), a measuring spring (33), a measuring slider (29), a measuring rod (30), and a measuring pointer (31); The base plate (1) is placed horizontally, and a back plate (9) is fixedly connected to the rear side of the upper end of the base plate (1). The back plate (9) is perpendicular to the base plate (1). A standard pointer (10) is fixedly connected to the rear end face of the lower part of the back plate (9). Side plates (2) are slidably connected to the left and right sides of the upper end of the base plate (1). The two side plates (2) move inward or outward synchronously. The herringbone gear (3) is horizontally fixed between the two side plates (2) along the axial direction. The standard pointer (10) is located in the middle position between the two side plates (2). The measuring plate (6) is horizontally set above the two side plates (2). The left and right sides of the rear end of the measuring plate (6) are slidably connected to retaining rods (32). The two retaining rods (32) move inward or outward synchronously. The lower ends of the two retaining rods (32) are located at the outer ends of the two sides of the herringbone gear (3). A measuring rod is provided between the measuring plate (6) and the retaining rods (32). A measuring spring (33) provides clamping force to the herringbone gear (3) for the retaining rod (32). A center pointer (11) is laterally slidably connected to the rear end face of the upper part of the back plate (9). The center pointer (11) is always located in the middle position between the two retaining rods (32). The standard pointer (10) and the surface of the back plate (9) corresponding to the center pointer (11) are respectively provided with standard scales (12). The upper end of the measuring plate (6) is horizontally slidably connected to two measuring sliders (29). The bottom of the two measuring sliders (29) is respectively fixedly connected to a measuring rod (30). The measuring rods (30) extend into the tooth grooves on both sides of the herringbone gear (3). The front and rear sides of the inner end of the measuring slider (29) are respectively fixedly connected to a measuring pointer (31). The upper surface of the measuring plate (6) corresponding to the measuring pointer (31) is provided with a measuring scale (13).

2. The precise measuring device for conveniently measuring the symmetry of herringbone gears according to claim 1, characterized in that... It also includes a mounting spring (4), a connecting slider and a connecting groove. The upper left and right sides of the base plate (1) are respectively provided with transverse connecting grooves. The connecting slider is slidably connected to the connecting grooves respectively. The bottom of the side plate (2) is fixedly connected to the inner side of the connecting slider. The outer side of the connecting slider is fixedly connected to one end of the mounting spring (4). The other end of the mounting spring (4) is fixedly connected to the inner wall of the connecting groove.

3. The precise measuring device for conveniently measuring the symmetry of herringbone gears according to claim 2, characterized in that... It also includes a fixed shaft (25), a first rack (26) and a first gear (27). The left and right sides of the rear end of the side plate (2) are respectively fixedly connected to the first rack (26). A first gear (27) meshes between the two first racks (26). The fixed shaft (25) is rotatably connected to the middle of the first gear (27). The fixed shaft (25) is fixedly connected to the back plate (9). The rear end of the fixed shaft (25) is fixedly connected to the standard pointer (10).

4. A precise measuring device for conveniently measuring the symmetry of herringbone gears according to any one of claims 1 to 3, characterized in that... It also includes a second rack (34), a second gear (35), a displacement slider (36), and a displacement groove. The rear ends of the two retaining rods (32) are respectively fixedly connected to the second rack (34). A second gear (35) meshes between the two second racks (34). The displacement slider (36) is rotatably connected to the middle of the second gear (35). A transverse displacement groove is opened on the surface of the back plate (9) corresponding to the displacement slider (36). The displacement slider (36) is slidably connected to the displacement groove. The two second racks (34) are respectively slidably connected to the displacement slider (36). The center pointer (11) is fixedly connected to the rear end of the displacement slider (36).

5. A precise measuring device for conveniently measuring the symmetry of herringbone gears according to any one of claims 1 to 3, characterized in that... It also includes mounting grooves and mounting sliders. Mounting grooves are provided on the left and right sides of the rear end of the measuring plate (6). Mounting sliders are fixedly connected to the front side of the upper end of the retaining rod (32). The mounting sliders are slidably connected to the mounting grooves. The outer side of the mounting slider is fixedly connected to one end of the measuring spring (33), and the other end of the measuring spring (33) is fixedly connected to the inner wall of the mounting groove.

6. A precise measuring device for conveniently measuring the symmetry of herringbone gears according to any one of claims 1 to 3, characterized in that... It also includes an adjusting groove, an adjusting slider (7), a fixing device, a support spring (5), a positioning frame (22), a positioning bolt (23), and a positioning plate (24). The two side plates (2) are respectively provided with longitudinal adjusting grooves. The adjusting slider (7) is slidably connected inside the adjusting groove. The adjusting slider (7) is respectively installed with a fixing device on its inner side. The herringbone gear (3) is installed between the two side plates (2) through the fixing device. The front and rear sides of the bottom of the adjusting slider (7) are respectively fixedly connected with the support spring (5). The bottom of the support spring (5) is respectively fixedly connected to the inner wall of the adjusting groove. The front end of the adjusting slider (7) is respectively fixedly connected with the positioning frame (22). The front end of the positioning frame (22) is respectively threadedly connected with the positioning bolt (23). The rear end of the positioning bolt (23) is respectively rotatably connected with the positioning plate (24). The positioning plate (24) is respectively located at the front end of the side plate (2).

7. The precise measuring device for conveniently measuring the symmetry of herringbone gears according to claim 6, characterized in that... It also includes a control knob (8), and the fixing device includes a mounting screw (21), a mounting block (14) and a fixing plate (15). The mounting screw (21) passes through the adjusting slider (7) and is rotatably connected to the middle of the adjusting slider (7). The control knob (8) is fixedly connected to the left end of the mounting screw (21), and the mounting block (14) is fixedly connected to the right end of the mounting screw (21). The fixing plate (15) is installed on the outer surface of the mounting block (14) and is located inside the bore of the herringbone gear (3).

8. The precise measuring device for conveniently measuring the symmetry of herringbone gears according to claim 7, characterized in that... It also includes a first hinge plate (16), a second hinge plate (17), a fixing knob (19), and a mounting ring (20). The mounting block (14) and the fixing plate (15) are hinged by the first hinge plate (16) and the second hinge plate (17). The surface of the second hinge plate (17) is hinged to one end of the support plate (18). The surface of the mounting screw (21) is threaded with the fixing knob (19). The inner end of the fixing knob (19) is rotatably connected to the inner surface of the mounting ring (20). The outer surface of the mounting ring (20) is hinged to the other end of the support plate (18).

9. The precise measuring device for conveniently measuring the symmetry of herringbone gears according to claim 7, characterized in that, The circumferential surface of the control knob (8) is provided with multiple auxiliary grooves.

Images