Measuring tool for indexing fluted disc

Abstract

The utility model provides a measuring tool for an indexing fluted disc, and belongs to the technical field of machinery. The problem that the indexing fluted disc is inconvenient to measure is solved. The device comprises a base and a detection seat fixedly connected to the upper surface of the base, the top of the detection seat is provided with a smooth and horizontally-arranged abutting face, the detection seat is provided with a detection groove penetrating through the front side face of the detection seat and the abutting face, two positioning blocks are fixed to the groove bottom of the detection groove, and each positioning block is provided with an obliquely-arranged positioning face. The inclination angles of the two positioning surfaces are the same, the inclination directions are opposite, the distance between the two positioning surfaces is gradually increased in the direction close to the notch of the detection groove, the left side groove wall and the right side groove wall of the detection groove are oppositely arranged, and the distance between the left side groove wall and the right side groove wall is larger than the maximum distance between the two positioning surfaces. The detection seat is provided with two air inlet holes and two air outlet holes communicated with the two air inlet holes in a one-to-one mode. The two air outlet holes are formed in the left side groove wall and the right side groove wall of the detection groove respectively and are aligned. The device has the advantage that the indexing fluted disc is convenient to measure.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a measuring tool for a dividing toothed disc. Background Art

[0002] The indexing gear is also called the end gear, which is a key component of the lathe turret tool holder mechanism. Figure 1 The indexing gear disc 1 shown in the figure includes a disc body 1a and an annular protrusion 1b located on one side of the disc body 1a and arranged concentrically therewith. During processing, a plurality of notches 1b1 are processed circumferentially on the annular protrusion 1b, so that the annular protrusion 1b will naturally form end face teeth 1b2 between two adjacent notches 1b1. Due to the arrangement of the notches 1b1, the full circle portion of the annular protrusion 1b is very small, resulting in the inability to directly measure the full circle portion. In view of this situation, the staff usually uses a common normal micrometer to measure the outer circle where the end face teeth 1b2 are located, but due to the technique, strength and other reasons, the measured value is easily different from the actual value, resulting in the need for repeated measurements in practice, so there is a problem of inconvenient measurement.

[0003] In addition, there is a measuring instrument called a pneumatic measuring instrument on the market, which can convert the change in the size of the workpiece into a change in the compressed air flow or pressure, which is then indicated by an indicating device to measure the size of the workpiece. For example, a Chinese patent has disclosed a pneumatic inspection device for the outer diameter of a pump shaft with a patent application number of 202322452985.9. It can measure the outer diameter of the pump shaft by setting a mounting table on which the pump shaft can be installed and using a pneumatic measuring instrument (also known as a pneumatic measuring instrument). However, the structure of the indexing gear is relatively special, so it is impossible to use this pneumatic inspection device in combination with a pneumatic measuring instrument to detect the outer circle of the end face teeth. Utility Model Content

[0004] The utility model aims to solve the above problems existing in the prior art and proposes a measuring tool for a dividing toothed disc, thereby solving the problem of inconvenience in measuring the dividing toothed disc.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A measuring tool for a graduated gear disk comprises a base and a detection seat fixedly connected to the upper surface of the base, characterized in that the top of the detection seat has a smooth and horizontally arranged abutment surface, the detection seat has a detection groove that runs through its front side surface and the abutment surface, two positioning blocks are fixed at the bottom of the detection groove, the two positioning blocks both have inclined positioning surfaces, the inclination angles of the two positioning surfaces are the same and the inclination directions are opposite, the distance between the two positioning surfaces gradually increases along the notch direction close to the detection groove, the left groove wall and the right groove wall of the detection groove are arranged opposite to each other and the distance between the two is greater than the maximum distance between the two positioning surfaces, the detection seat has two air inlets and two air outlets connected to the two air inlets one by one, the two air outlets are respectively arranged on the left groove wall and the right groove wall of the detection groove and the two air outlets are aligned.

[0007] This measuring tool can be used with an existing pneumatic measuring instrument to detect the outer circle size of the end face teeth of the indexing gear disc. When testing is required, the pneumatic measuring instrument is connected to the measuring tool through an air pipe (actually, the pneumatic measuring instrument is connected to the two air inlets), and then the pneumatic measuring instrument is started and the reading is calibrated with a calibration gauge. Then the calibration gauge is removed, and the indexing gear disc is pushed into the detection groove in such a way that the side surface where the annular protrusion is located is against the abutment surface (in order to ensure the fit between the side surface where the annular protrusion is located and the abutment surface, the top surface of the detection seat is finely ground to form the abutment surface in actual processing) until the outer circle of the end face teeth on the annular protrusion abuts against the two positioning surfaces, so as to realize the positioning of the indexing gear disc. In the positioning state, the outer circle of the face gear is tangent to the two positioning surfaces, and the center of the face gear is located on the center line of the air outlet. There is some gap between the outer circle of the face gear on the annular convex part and the left and right groove walls of the detection groove. Air is blown on the outer circle of the face gear on the annular convex part from the two air outlets at the same time, so the outer diameter of the face gear outer circle can be detected and judged whether it is within the standard range. Through the setting of this measuring tool, the use of pneumatic measuring instrument can be matched, so as to quickly and accurately detect whether the outer circle size of the face gear meets the design requirements, which greatly improves the convenience of measuring the indexing gear disc.

[0008] This measuring fixture is frequently used in the mass production of indexing gear discs. For this purpose, the positioning surface is set on the positioning block, which is fixed to the bottom wall of the detection slot, while the non-positioning block is a part of the detection seat. In this way, the positioning block can be made of a harder material to ensure wear resistance, and then the positioning surfaces are finely ground on the two positioning blocks to abut against the outer circle of the end face teeth of the indexing gear disc to form a positioning. Through such a setting, the long-term reliability of the detection accuracy can be ensured.

[0009] In the above-mentioned measuring fixture for indexing gear disc, the bottom wall of the detection groove has two mounting surfaces, and the two positioning blocks are respectively fixedly connected to the two mounting surfaces, and the two mounting surfaces are respectively parallel to the positioning surfaces on the fixed positioning blocks.

[0010] In actual production, the two positioning blocks are first fixed to the two mounting surfaces respectively, and then the two positioning blocks are finely ground based on the two mounting surfaces to obtain the two positioning blocks, so as to ensure the positioning accuracy of the indexing gear on the measuring fixture.

[0011] In the above-mentioned measuring fixture for the indexing gear disc, the bottom wall of the detection groove also has an arc surface, which protrudes toward the rear side of the detection seat and is connected between the two mounting surfaces.

[0012] By setting the arc surface, it is possible to make way for the positioning to ensure the positioning accuracy between the outer circle of the end face tooth and the two positioning surfaces.

[0013] In the above-mentioned measuring tool for the dividing gear disc, the front ends of the left and right groove walls of the detection groove are both provided with inclined guide surfaces, the inclination angles of the two guide surfaces are the same and the inclination directions are opposite, and the distance between the two guide surfaces gradually increases from back to front.

[0014] The arrangement of the two guide surfaces makes the notch of the detection groove expand outward, so that the annular protrusion of the indexing toothed disc can be easily pushed from outside the detection groove into the detection groove for detection.

[0015] In the above-mentioned measuring fixture for the indexing gear disc, both guide surfaces are provided with polyurethane blocks.

[0016] The end face teeth are related to the movement accuracy of the turret tool holder, so polyurethane blocks are arranged on the two guide surfaces to avoid scratches on the end face teeth when the annular protrusion is pushed into the detection groove.

[0017] In the above-mentioned measuring tool for the dividing gear disc, the detection seat includes a plate-shaped body and two strip-shaped bodies respectively fixedly connected to the two sides of the plate-shaped body by fasteners. The two strip-shaped bodies are arranged in a long strip shape along the front-to-back direction, and the front ends of the two strip-shaped bodies extend out of the plate-shaped body. The detection groove is composed of the front side surface of the plate-shaped body, the right side surface of the strip-shaped body located on the left, and the left side surface of the strip-shaped body located on the right. The base and the detection seat are fixed by a number of fastening screws that are threadedly connected to the plate-shaped body through a plurality of rods.

[0018] In the above-mentioned measuring tool for dividing gear disc, the base has a support plate and four legs fixedly connected to the bottom of the support plate, two air inlet holes are arranged at the bottom of the detection seat, the support plate is provided with two through holes in the vertical direction, the two through holes are respectively arranged concentrically with the two air inlet holes, and air joints are provided in the two through holes, and the air outlet ends of the air joints are threadedly connected to the lower end openings of the corresponding air inlet holes, a connecting block is fixedly connected to the bottom of the support plate, and the connecting block is respectively connected with an air inlet joint and an air outlet joint in the horizontal direction, the air outlet joint has an air inlet end and two air outlet ends, the air inlet joint has an air inlet end and an air outlet end, the air outlet end of the air inlet joint and the air inlet end of the air outlet joint are respectively threadedly connected in the connecting block and connected in the connecting block, and the air inlet end of the air inlet joint extends out of one side of the support plate.

[0019] In practice, the pneumatic measuring instrument is connected to the air inlet end of the air inlet joint through the air pipe, and then the two air outlet ends of the air outlet joint are respectively connected to the air inlet ends of the two air outlet joints through the air pipes. In this way, the gas supplied to the air inlet joint will enter the two air outlet joints respectively and enter the two air outlet holes through the two air outlet joints, and finally blow the gas in the two air outlet holes onto the outer circumference of the end face teeth on the annular convex part so that the pneumatic measuring instrument can automatically detect the outer diameter of the outer circle of the end face teeth. Among them, all the air pipes are arranged at the bottom of the measuring tool, and it is not easy for the air pipes to fall off due to accidental touch by the inspectors during the inspection.

[0020] In the above-mentioned measuring tool for dividing gear disc, the measuring tool also includes a calibration gauge, which has a disc-shaped calibration part, a disc-shaped abutment part and a cylindrical extension part from bottom to top. The calibration part, the abutment part and the extension part are concentrically arranged, and the outer diameter of the calibration part and the outer diameter of the extension part are both smaller than the outer diameter of the abutment part. The outer side of the upper end part of the extension part has a ring-shaped protruding handle part, and the outer circular surface of the calibration part can be tangent to the two positioning surfaces at the same time. When the outer circular surface of the calibration part is tangent to the two positioning surfaces, the center of the calibration part is located on the center line of the air outlet.

[0021] The traditional calibration gauge is in the shape of a simple disc, and when in use, it is directly placed into the detection slot through the notch of the detection slot. However, the size of the indexing gear disc is relatively large, which means that the size of the calibration gauge used is also relatively large, and it is very inconvenient to place the calibration gauge in the traditional way. The present application arranges the calibration gauge to include a calibration portion, an abutment portion, and an extension portion, and the outer side of the upper end portion of the extension portion has a ring-shaped protruding handle portion to facilitate the staff to carry and place the calibration gauge. Specifically, when placing the calibration gauge, the abutment portion is abutted against the abutment surface of the detection seat and the calibration gauge is pushed to allow the calibration portion to enter the detection slot until the outer circle of the calibration portion abuts against and is tangent to the two positioning surfaces at the same time.

[0022] Compared with the prior art, the measuring fixture for the indexing gear disc sets two positioning blocks on the bottom wall of the detection groove, and both positioning blocks have inclined positioning surfaces. Then, by setting relatively aligned air outlet holes on the left and right groove walls of the detection groove, the indexing gear disc can be positioned on the measuring fixture so that it can be used with a pneumatic measuring instrument, and the outer circle size of the end face teeth can be measured quickly and accurately, which greatly improves the measurement convenience of the indexing gear disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of the indexing gear disc.

[0024] Figure 2 It is a three-dimensional schematic diagram of this measuring tool.

[0025] Figure 3 This is a top view of the measuring tool.

[0026] Figure 4 yes Figure 3 Sectional view along AA direction.

[0027] Figure 5 It is a schematic diagram of the bottom of this measuring tool.

[0028] Figure 6 It is a three-dimensional schematic diagram of the calibration gauge.

[0029] Figure 7 It is a three-dimensional schematic diagram of the calibration gauge after it is positioned on the measuring fixture.

[0030] Figure 8 It is a three-dimensional schematic diagram of the indexing gear disc after being positioned on the measuring tool.

[0031] Fig. 9 This is the front view of the indexing gear after it is positioned on this measuring fixture.

[0032] Fig.10 yes Fig. 9 Cross-sectional view along the BB axis.

[0033] In the figure, 1, dividing gear disc; 1a, disc body; 1b, annular protrusion; 1b1, notch; 1b2, end face tooth; 2, base; 2a, support plate; 2a1, through hole; 2b, support foot; 3, detection seat; 3a, abutment surface; 3b, detection groove; 3b1, installation surface; 3b2, arc surface; 3b3, guide surface; 3c, plate-shaped body; 3d, strip-shaped body; 4, positioning block; 4a, positioning surface; 5, air inlet; 6, air outlet; 7, air joint; 8, connecting block; 9, air inlet joint; 10, air outlet joint; 11, calibration gauge; 11a, calibration part; 11b, abutment part; 11c, extension part; 11c1, handle part; 11d, weight reduction hole. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] Embodiment 1

[0036] like Figure 2 , Figure 3 and Fig.10 As shown, a measuring jig for a graduated toothed disc comprises a base 2 and a detection seat 3 fixedly connected to the upper surface of the base 2. The top of the detection seat 3 has a smooth and horizontally arranged abutment surface 3a, the detection seat 3 has a detection groove 3b that penetrates its front side and the abutment surface 3a, two positioning blocks 4 are fixed at the groove bottom position of the detection groove 3b, and the two positioning blocks 4 have inclined positioning surfaces 4a, the two positioning surfaces 4a have the same inclination angle and opposite inclination directions, the distance between the two positioning surfaces 4a gradually increases along the groove direction close to the detection groove 3b, the left groove wall and the right groove wall of the detection groove 3b are arranged oppositely and the distance between the two is greater than the maximum distance between the two positioning surfaces 4a, and the distance between the positioning surface 4a on the left and the left groove wall of the detection groove 3b is the same as the distance between the positioning surface 4a on the right and the right groove wall of the detection groove 3b. In the mass production of the graduated toothed disc 1, this measuring jig will be frequently used. To this end, the positioning surface 4a is set on the positioning block 4, and the positioning block 4 is fixed on the bottom wall of the detection groove 3b, while the non-positioning block 4 is a part of the detection seat 3. In this way, the positioning block 4 can be made of a material with higher hardness to ensure wear resistance, and then the positioning surface 4a is finely ground on the two positioning blocks 4 to abut against the outer circle of the end face tooth 1b2 of the indexing gear 1 to form positioning. Through such a setting, the long-term reliability of the detection accuracy can be ensured. The detection seat 3 has two air inlet holes 5 and two air outlet holes 6 connected one-to-one with the two air inlet holes 5. The two air outlet holes 6 are respectively vertically opened on the left and right groove walls of the detection groove 3b, and the two air outlet holes 6 are aligned. Specifically, the groove bottom wall of the detection groove 3b has two mounting surfaces 3b1, and the two positioning blocks 4 are respectively fixedly connected to the two mounting surfaces 3b1, and the two mounting surfaces 3b1 are respectively parallel to the positioning surfaces 4a on the fixed positioning blocks 4. The bottom wall of the detection groove 3b also has a curved surface 3b2, which protrudes toward the rear side of the detection seat 3 and is connected between the two mounting surfaces 3b1. The front end of the left groove wall and the front end of the right groove wall of the detection groove 3b are both provided with inclined guide surfaces 3b3, and the inclination angles of the two guide surfaces 3b3 are the same and opposite, and the distance between the two guide surfaces 3b3 gradually increases from the back to the front.

[0037] In practice, Figure 2 , Figure 3 and Figure 4As shown, the detection seat 3 includes a plate-shaped body 3c and two strip-shaped bodies 3d respectively connected to the two sides of the plate-shaped body 3c by fasteners. The two strip-shaped bodies 3d are arranged in a long strip shape along the front-back direction. The front ends of the two strip-shaped bodies 3d extend out of the plate-shaped body 3c. The detection slot 3b is composed of the front side surface of the plate-shaped body 3c, the right side surface of the strip-shaped body 3d located on the left, and the left side surface of the strip-shaped body 3d located on the right. The base 2 and the detection seat 3 are fixed by a plurality of fastening screws connected to the plate-shaped body 3c by a plurality of rods. Two groups of air inlet holes 5 and air outlet holes 6 are respectively arranged on the two strips 3d, and the bottom wall of the detection slot 3b is located on the plate-shaped body 3c. The detection seat 3 is configured to include a plate-shaped body 3c and two strip-shaped bodies 3d, which can reduce the difficulty of processing. After the plate-shaped body 3c and the two strip-shaped bodies 3d are assembled and connected to the detection seat 3, the obtained detection seat 3 is finely ground to form a smooth and horizontally arranged abutment surface 3a (mainly the top surface of the plate-shaped body 3c and the top surfaces of the two strip-shaped bodies 3d are finely ground to be flush with each other).

[0038] Furthermore, if Figure 4 and Figure 5 As shown, the base 2 has a support plate 2a and four legs 2b fixedly connected to the bottom of the support plate 2a, the two air inlet holes 5 are arranged at the bottom of the two shapes 3d of the detection seat 3, the support plate 2a is provided with two through holes 2a1 in the vertical direction, the two through holes 2a1 are respectively concentrically arranged with the two air inlet holes 5, and the two through holes 2a1 are each provided with an air connector 7, the outlet end of the air connector 7 is threadedly connected to the lower end opening of the corresponding air inlet hole 5, the bottom of the support plate 2a is fixedly connected with a connecting block 8, and the connecting block 8 is respectively connected with an air inlet connector 9 and an air outlet connector 10 in the horizontal direction, and the outlet The air connector 10 has an air inlet end and two air outlet ends, and the air inlet connector 9 has an air inlet end and an air outlet end. The air outlet end of the air inlet connector 9 and the air inlet end of the air outlet connector 10 are respectively threadedly connected in the connecting block 8 and are connected in the connecting block 8 (specifically, a cavity can be set in the connecting block 8, and the positions where the air outlet end of the air inlet connector 9 and the air inlet end of the air outlet connector 10 are threadedly connected are both connected to the cavity, so that the connection between the air inlet connector 9 and the air outlet connector 10 in the connecting block 8 can be realized), and the air inlet end of the air inlet connector 9 extends out of one side of the support plate 2a.

[0039] like Figure 6As shown, the measuring fixture also includes a calibration gauge 11, which has a disc-shaped calibration portion 11a, a disc-shaped abutment portion 11b and a cylindrical extension portion 11c from bottom to top. The calibration portion 11a, the abutment portion 11b and the extension portion 11c are concentrically arranged, and the outer diameter of the calibration portion 11a and the outer diameter of the extension portion 11c are both smaller than the outer diameter of the abutment portion 11b. The outer side of the upper end of the extension portion 11c has a ring-shaped protruding handle portion 11c1. The outer circular surface of the calibration portion 11a can be tangent to the two positioning surfaces 4a at the same time. When the outer circular surface of the calibration portion 11a is tangent to the two positioning surfaces 4a, the center of the calibration portion 11a is located on the center line of the air outlet 6. The calibration gauge 11 also has a weight reduction hole 11d. The outer diameter of the calibration portion 11a is smaller than the distance between the left groove wall and the right groove wall of the detection groove 3b.

[0040] This measuring tool is used in conjunction with an existing pneumatic measuring instrument to detect the outer diameter of the end face teeth 1b2 of the dividing gear disc 1. When testing is required, the pneumatic measuring instrument is connected to the measuring tool through an air pipe (in practice, the pneumatic measuring instrument is connected to the air inlet end of the air inlet connector 9 through an air pipe, and then the two air outlet ends of the air outlet connector 10 are respectively connected to the air inlet ends of the two air connectors 7 through air pipes), then the pneumatic measuring instrument is started, and the reading is calibrated with the calibration gauge 11. Specifically, when placing the calibration gauge 11, the abutment portion 11b is abutted against the abutment surface 3a of the detection seat 3 and the calibration gauge 11 is pushed so that the calibration portion 11a enters the detection groove 3b until the outer circle of the calibration portion 11a is abutted against and tangent to the two positioning surfaces 4a at the same time. In this state (the calibration portion 11a is in the positioned state as shown in FIG. 1 ). Figure 7 As shown in the figure, the outer circle of the calibration part 11a is located on the center line of the air outlet 6, and there is some gap between the outer circle of the calibration part 11a and the left and right groove walls of the detection groove 3b. Air is blown onto the outer circle surface of the calibration part 11a from the two air outlets 6 at the same time. At this time, the detected value is the standard value and is used as a reference.

[0041] After the reading is calibrated, remove the calibration gauge 11. Then push the annular protrusion 1b of the indexing gear 1 into the detection groove 3b in such a way that the side surface of the annular protrusion 1b abuts against the abutting surface 3a until the outer circle of the end face teeth 1b2 on the annular protrusion 1b abuts against the two positioning surfaces 4a, so as to realize the positioning of the indexing gear 1. In the positioned state, the outer circle of the end face teeth 1b2 is tangent to the two positioning surfaces 4a, and the center of the end face teeth 1b2 is located on the center line of the air outlet 6. There is some clearance between the outer circle of the end face teeth 1b2 and the left and right groove walls of the detection groove 3b (the state of the indexing gear 1 after positioning is as shown in the figure). Figure 8 , Fig. 9 and Fig.10As shown in the figure, the two air outlets 6 simultaneously blow air onto the outer circumference of the face gear 1b2, thereby the outer diameter of the outer circumference of the face gear 1b2 can be detected and judged whether it is within the standard range. The setting of the measuring tool can be used with the use of a pneumatic measuring instrument, so as to quickly and accurately detect whether the outer circumference size of the face gear 1b2 meets the design requirements, greatly improving the convenience of measuring the indexing gear disc.

[0042] Embodiment 2

[0043] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, both guide surfaces 3b3 are provided with polyurethane blocks.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A measuring tool for a graduated toothed disc, comprising a base (2) and a detection seat (3) fixedly connected to the upper surface of the base (2), characterized in that: The top of the detection seat (3) is provided with a smooth and horizontally arranged abutment surface (3a), the detection seat (3) is provided with a detection groove (3b) penetrating its front side surface and the abutment surface (3a), two positioning blocks (4) are fixed at the groove bottom position of the detection groove (3b), the two positioning blocks (4) are provided with inclined positioning surfaces (4a), the inclination angles of the two positioning surfaces (4a) are the same and the inclination directions are opposite, the distance between the two positioning surfaces (4a) gradually increases along the groove direction close to the detection groove (3b), the left groove wall and the right groove wall of the detection groove (3b) are arranged opposite to each other and the distance between the two is greater than the maximum distance between the two positioning surfaces (4a), the detection seat (3) is provided with two air inlet holes (5) and two air outlet holes (6) connected one-to-one with the two air inlet holes (5), the two air outlet holes (6) are respectively arranged on the left groove wall and the right groove wall of the detection groove (3b) and the two air outlet holes (6) are aligned.

2. The measuring tool for indexing gear disc according to claim 1, characterized in that: The bottom wall of the detection groove (3b) has two mounting surfaces (3b1), and the two positioning blocks (4) are respectively fixedly connected to the two mounting surfaces (3b1), and the two mounting surfaces (3b1) are respectively parallel to the positioning surfaces (4a) on the fixedly connected positioning blocks (4).

3. The measuring tool for indexing gear disc according to claim 2, characterized in that: The bottom wall of the detection groove (3b) further comprises a curved surface (3b2), the curved surface (3b2) protrudes toward the rear side of the detection seat (3), and the curved surface (3b2) is connected between the two mounting surfaces (3b1).

4. The measuring tool for indexing gear disc according to claim 1, 2 or 3, characterized in that: The front ends of the left and right groove walls of the detection groove (3b) are both provided with inclined guide surfaces (3b3), the two guide surfaces (3b3) have the same inclination angle and opposite inclination directions, and the distance between the two guide surfaces (3b3) gradually increases from back to front.

5. The measuring tool for indexing gear disc according to claim 4, characterized in that: Both guide surfaces (3b3) are provided with polyurethane blocks.

6. The measuring tool for indexing gear disc according to claim 1, characterized in that: The detection seat (3) comprises a plate-shaped body (3c) and two strip-shaped bodies (3d) respectively connected to the two sides of the plate-shaped body (3c) by fasteners. The two strip-shaped bodies (3d) are arranged in a long strip shape along the front-back direction. The front ends of the two strip-shaped bodies (3d) extend out of the plate-shaped body (3c). The detection groove (3b) is composed of the front side surface of the plate-shaped body (3c), the right side surface of the strip-shaped body (3d) located on the left side, and the left side surface of the strip-shaped body (3d) located on the right side. The base (2) and the detection seat (3) are fixed by a plurality of fastening screws whose rods are threadedly connected to the plate-shaped body (3c).

7. The measuring tool for indexing gear disc according to claim 1, characterized in that: The base (2) comprises a support plate (2a) and four legs (2b) fixedly connected to the bottom of the support plate (2a). The two air inlet holes (5) are arranged at the bottom of the detection seat (3). The support plate (2a) is provided with two through holes (2a1) in the vertical direction. The two through holes (2a1) are respectively arranged concentrically with the two air inlet holes (5). The two through holes (2a1) are provided with air joints (7). The air outlet end of the air joint (7) is threadedly connected to the lower end opening of the corresponding air inlet hole (5). The bottom of the support plate (2a) is provided with a plurality of through holes (2a1). The connecting block (8) is fixedly connected to the connecting block (8), and an air inlet joint (9) and an air outlet joint (10) are respectively connected to the connecting block (8) in the horizontal direction. The air outlet joint (10) has an air inlet end and two air outlet ends. The air inlet joint (9) has an air inlet end and an air outlet end. The air outlet end of the air inlet joint (9) and the air inlet end of the air outlet joint (10) are respectively threadedly connected to the connecting block (8) and are connected to each other in the connecting block (8). The air inlet end of the air inlet joint (9) extends out of a side edge of the supporting plate (2a).

8. The measuring tool for indexing gear disc according to claim 1, characterized in that: The measuring tool also includes a calibration gauge (11), which comprises, from bottom to top, a disc-shaped calibration portion (11a), a disc-shaped abutment portion (11b), and a cylindrical extension portion (11c). The calibration portion (11a), the abutment portion (11b), and the extension portion (11c) are concentrically arranged. The outer diameter of the calibration portion (11a) and the outer diameter of the extension portion (11c) are both smaller than the outer diameter of the abutment portion (11b). The outer side of the upper end portion of the extension portion (11c) comprises a handle portion (11c1) protruding in the shape of an annulus. The outer circular surface of the calibration portion (11a) can be tangent to the two positioning surfaces (4a) at the same time. When the outer circular surface of the calibration portion (11a) is tangent to the two positioning surfaces (4a), the center of the calibration portion (11a) is located on the center line of the air outlet (6).

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