Tool for measuring crank throw angle during twisting of multi-throw crankshaft forge piece

Abstract

The utility model discloses a tool for measuring a crank angle during twisting of a multi-throw crankshaft forge piece. The tool comprises a right-angle lug, a first semicircular protractor, a second semicircular protractor and an angle swing control rod, the two ends of a first semicircular protractor are fixed to the long edge of the right-angle lug, one end of an angle swing control rod is installed on the long edge of the right-angle lug through a first bolt, a horizontal gap is formed in the middle line position of the middle of the angle swing control rod, and the horizontal gap coincides with the angle scale line of the first semicircular protractor to determine the angle of a crank throw. The two ends of the second semicircular protractor are fixed to the far end of the angle swing control rod, the hanging needle is installed on the angle swing control rod through the second bolt, and the hanging needle freely, vertically and downwards points to the angle scale line of the second semicircular protractor. One measuring tool can measure the twist angles of all multi-throw crankshafts within the range of 0-180 degrees, and the technical defects that the measuring angle is single and the measuring mode is complex when the crankshafts twist are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of crank angle measurement, and in particular relates to a crank angle measurement tool for a multi-turn crankshaft forging when the crankshaft is twisted. Background Art

[0002] Currently, multi-turn lower crankshaft forgings include three-turn crankshafts, four-turn crankshafts, five-turn crankshafts, six-turn crankshafts, seven-turn crankshafts, eight-turn crankshafts, etc. Common crankshaft twist angles are 30°, 60°, 72°, 90°, 120°, etc. Due to different crankshaft shapes and operating conditions, the crankshaft twist angles are also different.

[0003] Multi-turn crankshaft forgings are special-shaped parts in the forging industry. Besides conventional upsetting and drawing to ensure the forging ratio of each part, the success of the crankshaft forging depends directly on whether the twist angle of each crankshaft throw meets the process requirements. Therefore, the twist angle of the crankshaft throw is a key dimension of the crankshaft and the most important feature that determines whether the crankshaft can be a special-shaped part. However, due to its large weight and size, crankshafts are often formed by open forging. Therefore, the twist angle of each crankshaft throw is usually measured using fixed-angle measurement tools, which have a single measurement angle and a complex measurement method. Summary of the Invention

[0004] The purpose of the utility model is to solve the above technical problems and provide a crank angle measuring tool that can measure the crankshaft twist angle of a multi-turn crankshaft forging within the range of 0 to 180 degrees.

[0005] To achieve the above-mentioned purpose, the present invention provides a tool for measuring the crank angle of a multi-turn crankshaft forging during twisting, comprising a right-angle support, a first semicircular protractor, a second semicircular protractor and an angle swing control rod; the two ends of the first semicircular protractor are fixed to the long side of the right-angle support, one end of the angle swing control rod is installed on the long side of the right-angle support by a first bolt, a horizontal gap is opened at the middle center line position on the angle swing control rod, and the angle of the angle swing control rod corresponding to the crank is determined by coinciding the horizontal gap with the angle scale line of the first semicircular protractor; the two ends of the second semicircular protractor are fixed at the far end of the angle swing control rod, and the hanging needle is installed on the angle swing control rod by a second bolt, and the hanging needle is free to point vertically downward to the angle scale line of the second semicircular protractor.

[0006] Furthermore, the center of the first semicircular protractor is concentrically arranged with the first bolt.

[0007] Furthermore, a line connecting the 90° scale line of the first semicircular protractor and the center of the first semicircular protractor is perpendicular to the long side of the right-angled protrusion.

[0008] Furthermore, the line connecting the 90° scale line of the second semicircular protractor and the center of the second semicircular protractor is perpendicular to the angle swing control rod.

[0009] Furthermore, the center of the second semicircular protractor is concentrically arranged with the second bolt.

[0010] Furthermore, the right-angle bracket is a flat iron right-angle bracket.

[0011] Furthermore, the angle swing control rod is a flat iron angle swing control rod.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1) Cost saving: One measuring tool can measure the twist angle of all multi-turn crankshafts within the range of 0-180°, eliminating the need to manufacture a measuring instrument for each twist angle. This solves the technical defects of single measurement angle and complex measurement method when measuring crankshaft twist;

[0014] 2) High measurement accuracy: When measuring, the present invention can clearly know the angle of the crankshaft twist according to the angle pointed by the hanging needle, which is convenient for timely adjustment of the twist angle, improves the measurement accuracy, and avoids the technical defects of traditional measurement methods that cannot clearly guide the measurement deviation and are difficult to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the tooling structure for measuring the crank angle of a multi-turn crankshaft forging when twisting the crankshaft;

[0016] Figure 2 This is the main view of the crankshaft;

[0017] Figure 3 for Figure 2 A-directed graph;

[0018] Figure 4 for Figure 2 BB usage diagram. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1The tooling for measuring the crank angle of a multi-turn crankshaft forging during twisting shown includes a right-angle support 1, a first semicircular protractor 2, a second semicircular protractor 8 and an angle swing control rod 4; both ends of the first semicircular protractor 2 are fixed to the long side of the right-angle support 1, and at the same time, one end of the angle swing control rod 4 is installed on the long side of the right-angle support 1 through a first bolt 3, and the center of the first semicircular protractor 2 is concentrically arranged with the first bolt 3, and the line connecting the 90° scale line of the first semicircular protractor 2 and the center of the first semicircular protractor 2 is perpendicular to the long side of the right-angle support 1; a horizontal slit 5 is opened at the middle midline position on the angle swing control rod 4, and the angle of the angle swing control rod 4 corresponding to the crank is determined by the coincidence of the horizontal slit 5 with the angle scale line of the first semicircular protractor 2. Both ends of the second semicircular protractor 8 are fixed at the distal end of the angle swing control rod 4, and the line connecting the 90° scale line of the second semicircular protractor 8 and the center of the second semicircular protractor 8 is perpendicular to the angle swing control rod 4; at the same time, the hanging needle 7 is installed on the angle swing control rod 4 through the second bolt 6, and the hanging needle 7 is free to point vertically downward to the angle scale line of the second semicircular protractor 8, and the center of the second semicircular protractor 8 is concentrically arranged with the second bolt 6.

[0021] In this embodiment, the right-angle support 1 is a flat iron right-angle support, and the angle swing control rod 4 is a flat iron angle swing control rod.

[0022] like Figure 2 、 3 As shown in Figure 4, during the torsion process of the crankshaft throw 9, according to the angle α to which the crankshaft 9 needs to be twisted, loosen the first bolt 3 on the long side of the right-angle support 1, adjust the angle swing control lever 4 so that the horizontal gap 5 is aligned with the scale line α on the first semicircular protractor 2, tighten the first bolt 3 to fix the angle swing control lever 4 on the long side of the right-angle support 1; then place the measuring work on the crankshaft 9 that needs to be twisted, with the long side of the right-angle support 1 placed on the long side of the crankshaft 9 and the short side of the right-angle support 1 placed on the short side of the crankshaft. When the hanging needle 7 on the angle swing control lever 4 freely points vertically downward to the 90° scale line of the second semicircular protractor 8, it means that the torsion angle α is in place.

[0023] If the needle 7 points to less than 90°, it means that it needs to be adjusted counterclockwise, and the twist adjustment should be performed counterclockwise according to the phase difference angle; if the needle 7 points to more than 90°, it means that it needs to be adjusted clockwise, and the twist adjustment should be performed clockwise according to the phase difference angle. The utility model can be used to measure the twist angle of all multi-turn crankshafts within the range of 0 to 180°, and has very wide application significance.

Claims

1. A tool for measuring the crank angle of a multi-turn crankshaft forging during twisting, characterized by: The invention comprises a right-angle support (1), a first semicircular protractor (2), a second semicircular protractor (8) and an angle swing control rod (4); two ends of the first semicircular protractor (2) are fixed on the long side of the right-angle support (1); one end of the angle swing control rod (4) is installed on the long side of the right-angle support (1) through a first bolt (3); a horizontal slit (5) is opened at the middle center line position of the angle swing control rod (4); the angle corresponding to the crank of the angle swing control rod (4) is determined by the horizontal slit (5) and the angle scale line of the first semicircular protractor (2) being coincident; two ends of the second semicircular protractor (8) are fixed at the far end of the angle swing control rod (4); a hanging needle (7) is installed on the angle swing control rod (4) through a second bolt (6); the hanging needle (7) freely points vertically downward to the angle scale line of the second semicircular protractor (8).

2. The tool for measuring the crank angle of a multi-turn crankshaft forging when twisting according to claim 1, characterized in that: The center of the first semicircular protractor (2) is concentrically arranged with the first bolt (3).

3. The tool for measuring the crank angle of a multi-turn crankshaft forging when twisting according to claim 1, characterized in that: The line connecting the 90° scale line of the first semicircular protractor (2) and the center of the first semicircular protractor (2) is perpendicular to the long side of the right-angled protractor (1).

4. The tool for measuring the crank angle of a multi-turn crankshaft forging when it is twisted according to claim 1, characterized in that: The line connecting the 90° scale line of the second semicircular protractor (8) and the center of the second semicircular protractor (8) is perpendicular to the angle swing control rod (4).

5. The tool for measuring the crank angle of a multi-turn crankshaft forging when twisting according to claim 1, characterized in that: The center of the second semicircular protractor (8) is concentrically arranged with the second bolt (6).

6. The tool for measuring the crank angle of a multi-turn crankshaft forging when it is twisted according to claim 1, characterized in that: The right-angle bracket (1) is a flat iron right-angle bracket.

7. The tool for measuring the crank angle of a multi-turn crankshaft forging when twisting according to claim 1, characterized in that: The angle swing control rod (4) is a flat iron angle swing control rod.

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