Detection tool for detecting symmetry degree of key groove of shaft part

Abstract

The utility model discloses a detection tool for detecting the symmetry degree of key grooves of shaft parts, and belongs to the field of mechanical manufacturing. The first supporting plate and the second supporting plate are fixed to the two sides of the body respectively, the two ends of the left-right-handed screw are installed on the first supporting plate and the second supporting plate respectively, the hand wheel is installed at one end of the left-right-handed screw, the two ends of the sliding rod are fixed to the first supporting plate and the second supporting plate respectively, and the V-shaped block is in sliding connection with the sliding rod. And a sliding sleeve arranged in the V-shaped block is in threaded fit with the left-handed and right-handed screw rod. According to the utility model, the center of the key slot can be fixed by the boss clip of the sliding sleeve on the left-handed and right-handed screw, the outer diameter center of the shaft part is determined through the V-shaped block, and the difference value of the two centers, namely the symmetry degree of the key slot relative to the outer diameter of the shaft part, can be measured, so that the risk of misjudgment of the measurement result caused by the parallelism of the inner wall surface of the key slot can be neglected, and the detection accuracy is improved. The detection result is more accurate than that of a three-coordinate measuring machine, an operator can be rapidly guided to adjust equipment, the product manufacturing quality and the detection efficiency can be improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical manufacturing, in particular to a checking tool for checking the symmetry of keyways of shaft parts. Background Art

[0002] In shaft parts, the key and keyway structure is often used to transmit torque. The keyway symmetry on the shaft is the geometric tolerance that needs to be focused on during the assembly of the shaft, key and sleeve. Its accuracy directly affects the installation accuracy of the shaft, key and sleeve. It must be detected quickly online to ensure online quality judgment and efficient production. In the existing technology, three-coordinate measuring machines are generally used for detection.

[0003] The investment in online inspection equipment using a three-coordinate measuring machine is large, and it needs to be equipped with highly skilled inspection personnel for inspection. It is inefficient and cannot achieve full inspection. At the same time, the three-coordinate measuring machine has a large measurement error for the inspection of such non-directional, single-element products. This is mainly because the axis has no direction in the radial direction. When measuring the three coordinates, the workpiece coordinate system needs to be determined by the inner wall of the keyway. However, the depth of the two inner walls is very shallow and there is a non-parallelism error. This error value will be brought in when establishing the coordinate system, so the measurement result has an uncertain error, is not instructive, and is not convenient for online inspection and control in production. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the invention of the utility model is to provide a checking fixture for detecting the symmetry of the keyway of shaft parts, so as to realize the rapid online detection of the symmetry of the keyway of shaft parts.

[0005] In order to achieve the above-mentioned purpose of the invention, the support plate 1 and the support plate 2 of the utility model are respectively fixed on both sides of the main body, the two ends of the left and right rotating screws are respectively installed on the support plate 1 and the support plate 2, one end of the left and right rotating screws is equipped with a handwheel, the two ends of the sliding rod are respectively fixed on the support plate 1 and the support plate 2, the V-shaped block is slidably connected to the sliding rod, and the sliding sleeve placed in the V-shaped block cooperates with the left and right rotating screw threads.

[0006] Furthermore, the support plate 1 is fixed to one side of the upper plane of the main body by means of a cylindrical locating pin 2 and a hexagon socket head screw, one end of the left and right screws passes through the hole on the support plate 1 and matches with the gap of the hole on the support plate 1, and the left and right screws are connected to the support plate 1 by means of a hexagonal nut, an elastic gasket and a flat washer; one end of the sliding rod passes through the hole on the support plate 1 and is fixed to the support plate 1 by means of a hexagon socket flat-end tightening screw 2; the other end of the left and right screws passes through the hole on the support plate 2 and matches with the gap of the hole on the support plate 2; the other end of the sliding rod passes through the hole on the support plate 2 and is fixed to the support plate 2 by means of a hexagon socket flat-end tightening screw 2; the support plate 2 is fixed to the other side of the upper plane of the main body by means of a cylindrical locating pin 2 and a hexagon socket head screw; the handwheel is fixed to one end of the left and right screws by means of a cylindrical locating pin 1.

[0007] Furthermore, the threads on both sides of the left-handed and right-handed screws have opposite rotation directions; and the sliding rods are arranged in two parallel to each other.

[0008] Furthermore, there are two sliding sleeves, which are symmetrically installed in the middle of the left and right rotating screws. The internal threaded holes at one end of the two sliding sleeves are respectively connected to the external threads on both sides of the left and right rotating screws. The outer edge of the other end of the sliding sleeve is provided with a boss clip. The width of the boss clip is less than half of the width of the keyway of the shaft part, and the height is greater than the depth of the keyway of the shaft part.

[0009] Furthermore, the sliding sleeve is located in the cavity at the bottom of the V-shaped block, and the boss clip of the sliding sleeve extends out of the cavity at the bottom of the V-shaped block and contacts the inner wall of the keyway of the shaft part placed on the V-shaped block.

[0010] Furthermore, a bushing is provided in the hole on the support plate 1, and the connecting rods of the two dial indicators are installed in the bushing and fixed with a hexagonal flat-end fastening screw 1, and the pointer of the dial indicator faces one side of the V-shaped block.

[0011] Compared with the prior art, the utility model can use the boss clip of the sliding sleeve on the left-handed screw to fix the keyway center, determine the outer diameter center of the shaft part through the V-shaped block, and measure the difference between the two centers, which is the symmetry of the keyway relative to the outer diameter of the shaft part. This inspection tool can ignore the risk of misjudgment of the measurement result due to the parallelism of the inner wall of the keyway. Its detection result is more accurate than that of the three-coordinate measuring machine, and can quickly guide the operator to adjust the equipment, thereby improving product manufacturing quality and detection efficiency, reducing production costs, and is suitable for online rapid detection of the symmetry of single keyways or multiple keyways of shaft parts of different specifications and in different fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a simplified structural diagram of the utility model.

[0013] Figure 2 for Figure 1 Right view of .

[0014] Figure 3 for Figure 1 Top view of the .

[0015] In the figure: 1. body; 2. support plate 1; 3. hexagonal nut; 4. elastic gasket; 5. flat washer; 6. left-right screw; 7. sleeve; 7-1. boss clip; 8. V-shaped block; 8-1. cavity; 9. support plate 2; 10. handwheel; 11. cylindrical locating pin 1; 12. hexagon socket flat end fastening screw 1; 13. bushing; 14. hexagon socket flat end fastening screw 2; 15. cylindrical locating pin 2; 16. hexagon socket cylindrical head screw; 17. dial indicator; 18. slide rod; 19. shaft parts. DETAILED DESCRIPTION

[0016] like Figure 1 , Figure 2 , Figure 3 As shown, the support plate 12 of the utility model is fixed to one side of the plane of the main body 1 by a cylindrical positioning pin 15 and a hexagon socket head screw 16. One end of the left and right screw rods 6 pass through the hole on the support plate 2 and match the gap with the hole on the support plate 2. The left and right screw rods 6 are connected to the support plate 2 through a hexagonal nut 3, an elastic gasket 4, and a flat washer 5. Two slide rods 18 are arranged parallel to each other. One end of the slide rod 18 passes through the hole on the support plate 2 and is fixed to the support plate 2 by a hexagon socket flat-end fastening screw 14. The left and right screw rods 6 The other end of the two slide bars 18 passes through the hole on the support plate 29 and is gap-matched with the hole on the support plate 29; the other ends of the two slide bars 18 pass through the holes on the support plate 29 and are fixed to the support plate 29 with the hexagonal flat-end fastening screws 14, and the support plate 29 is fixed to the other side of the plane on the main body 1 with the cylindrical locating pins 15 and the hexagonal cylindrical head screws 16; the handwheel 10 is fixed to one end of the left and right rotating screws 6 with the cylindrical locating pins 11; the V-shaped block 8 is slidably connected to the slide bar 18, and the sliding sleeve 7 placed in the V-shaped block 8 is threadedly matched with the left and right rotating screws 6.

[0017] There are two sliding sleeves 7, which are located in the cavity 8-1 at the bottom of the V-shaped block 8 and are symmetrically installed in the middle of the left and right screws 6. The threads on both sides of the left and right screws 6 have opposite rotation directions. The internal threaded holes at one end of the two sliding sleeves 7 are respectively connected to the external threads on both sides of the left and right screws 6. The outer edge of the other end of the sliding sleeve 7 is provided with a boss clip 7-1. The width of the boss clip 7-1 is less than half of the width of the keyway of the shaft part 19, and the height is greater than the depth of the keyway of the shaft part 19. The boss clip 7-1 of the sliding sleeve 7 extends outside the cavity 8-1 at the bottom of the V-shaped block 8 and contacts the inner wall of the keyway of the shaft part 19 placed on the V-shaped block 8.

[0018] A bushing 13 is provided in the hole on the support plate 2, and the connecting rods of the two dial indicators 17 are installed in the bushing 13 and fixed with a hexagonal flat-end fastening screw 12. The pointer of the dial indicator 17 faces one side of the V-shaped block 8.

[0019] The detection process of the utility model for detecting the symmetry of the keyway of shaft parts 19 is as follows:

[0020] (a) placing the shaft part 19 on the V-block 8, the V-block 8 can determine the outer diameter center of the shaft part 19, so that the keyway of the shaft part 19 is aligned with the boss clips 7-1 on the two sleeves 7;

[0021] (b) Turn the handwheel 10 clockwise to expand the two sleeves 7 outward synchronously at the left-hand and right-hand threads on both sides of the left-hand and right-hand screw rods 6, so that the boss clips 7-1 on the sleeves 7 can tighten the inner wall of the keyway of the shaft part 19 to fix the center of the keyway of the shaft part 19;

[0022] (c) When the keyway center is fixed, the outer diameter of the shaft part 19 is forced to push the V-shaped block 8 to slide on the two slide bars 18, and then drive the percentage indicator 17 to rotate. The dial of the percentage indicator 17 is manually rotated so that its pointer is aligned with the zero position;

[0023] (d) Turn the hand wheel 10 counterclockwise again, loosen the shaft part 19 and take it out, manually rotate it horizontally 180 degrees, and then put it into the V-shaped block 8, align the keyway of the shaft part 19 with the boss clips 7-1 on the two sliding sleeves 7, and turn the hand wheel 10 clockwise to make the two sliding sleeves 7 expand outward synchronously at the left and right threads on both sides of the left and right rotating screw rods 6, so that the boss clips 7-1 on the sliding sleeve 7 can tighten the inner wall of the keyway, so that the center of the keyway of the shaft part 19 is fixed;

[0024] (e) When the center of the keyway is fixed, the outer diameter of the shaft part 19 is forced to push the V-block 8 to slide on the two slide bars 18, and then drive the percentage indicator 17 to rotate. The value read on the indicator is the difference between the center of the outer diameter of the shaft part 19 and the center of the keyway, that is, the symmetry of the keyway relative to the outer diameter of the shaft part 19.

Claims

1. A test fixture for detecting the symmetry of keyways of shaft parts, characterized in that: The support plate 1 (2) and the support plate 2 (9) are respectively fixed on both sides of the body (1), the two ends of the left and right screw rods (6) are respectively mounted on the support plate 1 (2) and the support plate 2 (9), one end of the left and right screw rods (6) is equipped with a hand wheel (10), the two ends of the slide rod (18) are respectively fixed on the support plate 1 (2) and the support plate 2 (9), the V-shaped block (8) is slidably connected to the slide rod (18), and the sliding sleeve (7) disposed in the V-shaped block (8) is threadedly matched with the left and right screw rods (6).

2. The inspection tool for detecting the symmetry of keyways of shaft parts according to claim 1 is characterized in that: The support plate (2) is fixed to one side of the upper plane of the main body (1) by means of two cylindrical positioning pins (15) and a hexagon socket head screw (16); one end of the left and right screw rods (6) passes through the hole on the support plate (2) and is gap-matched with the hole on the support plate (2); the left and right screw rods (6) are connected to the support plate (2) by means of a hexagonal nut (3), an elastic gasket (4) and a flat washer (5); one end of the sliding rod (18) passes through the hole on the support plate (2) and is fixed to the support plate by means of two hexagon socket head flat-end screws (14). The other end of the left-hand screw (6) passes through the hole on the second support plate (9) and is fitted with the hole on the second support plate (9); the other end of the slide bar (18) passes through the hole on the second support plate (9) and is fixed to the second support plate (9) by a second hexagon socket flat-end screw (14); the second support plate (9) is fixed to the other side of the upper plane of the body (1) by a second cylindrical locating pin (15) and a hexagon socket cylindrical head screw (16); the hand wheel (10) is fixed to one end of the left-hand screw (6) by a first cylindrical locating pin (11).

3. The inspection tool for detecting the symmetry of keyways of shaft parts according to claim 1 is characterized in that: The threads on both sides of the left-hand and right-hand screws (6) have opposite rotation directions.

4. The inspection tool for detecting the symmetry of keyways of shaft parts according to claim 1 is characterized in that: The sliding rods (18) are arranged in two parallel configurations.

5. The inspection tool for detecting the symmetry of keyways of shaft parts according to claim 1 is characterized in that: There are two sliding sleeves (7) symmetrically mounted in the middle of the left and right screws (6); the internal threaded holes at one end of the two sliding sleeves (7) are respectively connected to the external threads on both sides of the left and right screws (6); the outer edge of the other end of the sliding sleeve (7) is provided with a boss clip (7-1); the width of the boss clip (7-1) is less than half the width of the keyway of the shaft part (19), and the height is greater than the depth of the keyway of the shaft part (19).

6. The inspection tool for detecting the symmetry of keyways of shaft parts according to claim 1, characterized in that: The sliding sleeve (7) is located in a cavity (8-1) at the bottom of the V-shaped block (8), and the boss clip (7-1) of the sliding sleeve (7) extends outside the cavity (8-1) at the bottom of the V-shaped block (8) and contacts the inner wall of the keyway of a shaft part (19) placed on the V-shaped block (8).

7. The inspection tool for inspecting the symmetry of keyways of shaft parts according to claim 1, characterized in that: A bushing (13) is provided in the hole on the support plate (2), and connecting rods of two dial indicators (17) are installed in the bushing (13) and fixed by a hexagon socket flat-end screw (12), and the pointer of the dial indicator (17) faces one side of the V-shaped block (8).

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