CN203323686U - Detecting tool for symmetry degree of crankshaft keyway - Google Patents

Abstract

This invention relates to a crankshaft keyway symmetry inspection fixture, comprising a dial indicator, a keyway plug plate, and an indicator holder. The indicator holder is mounted on the end face of the keyway plug plate, and the dial indicator is located at the front end of the indicator holder and connected to the indicator holder via a measuring rod sleeve. This fixture has a simple structure, is easy to manufacture, and is simple to operate. It reduces the requirements for inspection operators, making operation more convenient, eliminating the need to lift the crankshaft and place it on an inspection platform for inspection, thus greatly improving inspection efficiency.

Description

Crankshaft keyway symmetry inspection tool

technical field

The utility model relates to a checking tool for quickly detecting the symmetry of a crankshaft keyway.

Background technique

In the past, the symmetry of the keyway of the crankshaft was tested by placing the crankshaft on the V-shaped iron of the platform, and using a height vernier caliper plus a lever dial indicator. The specific detection method is as follows:

Step 1: Lift the crankshaft after the keyway has been machined, and place it on the two V-shaped irons on the platform, so that the positioning main journal is in contact with the two V-shaped irons;

Step 2: Insert the keyway gauge block into the crankshaft keyway, and then use the lever dial indicator installed on the height vernier caliper to adjust the centers of the two reference main journals to the same height;

Step 3: Adjust the reference crankpin center to the same height as the two reference main journal centers, that is, the plane formed by the reference main journal centerline and the crankpin shaft centerline is parallel to the platform;

Step 4: Use another lever dial indicator to detect the height of the key block in the key groove, and record the value;

Step 5: Drag the dial indicator along the length direction of the crankshaft (that is, the axial direction), and observe the change value of the reading of the dial indicator;

Step 6: Rotate the crankshaft 180 degrees axially, then repeat the third and fourth steps, and record the value of the height of the detection key block;

Step 7: Compare the above two key block height values, calculate the difference, then compare with the axial detection value, and take the maximum value.

There are many problems in this detection method. The first is that the detection level of the detection operator is high; the second is that there are many operation steps and low efficiency.

Contents of the invention

The purpose of the utility model is to provide a simple structure, convenient manufacture, simple and convenient practical crankshaft keyway symmetry on-line rapid inspection tool.

In order to achieve the above object, the crankshaft keyway symmetry inspection tool of the present utility model includes a dial indicator, and also includes a keyway plug plate and a meter frame, the meter frame is arranged on the end face of the keyway plug plate, and the dial indicator is arranged on the meter frame The front end of the dial indicator is connected with the meter frame through the measuring rod sleeve.

The table frame is a Z-shaped right-angle frame.

The table frame includes an L-shaped right-angle frame, and the top of the L-shaped right-angle frame is fixedly connected with the middle part of the horizontal frame.

The utility model has the advantages of simple structure, convenient manufacture and simple operation. The requirements for testing operators are reduced, and the operation is more convenient, and it is not necessary to lift the crankshaft and place it on the testing platform for testing. When the meter stand is a combination of an L-shaped right-angle frame and a horizontal frame, the meter stand is more stable, and the detection error is small. At the same time, one end of the horizontal frame can also be used as an operating handle, which is more convenient to operate.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment one;

Fig. 2 is a schematic structural diagram of the second embodiment.

Detailed ways

Embodiment one

It can be seen from Fig. 1 that the crankshaft keyway symmetry inspection tool of the present invention includes a dial indicator 3, a keyway plug plate 1 and a watch frame 2, the watch frame 2 is arranged on the end face of the keyway plug plate 1, and the dial indicator 3 is arranged on the table The front end of the frame 2, the measuring rod cover of the dial indicator 3 passes through the fixing hole, and is connected with the table frame 2 by the set screw 5. The table frame is a Z-shaped right-angle table frame.

Embodiment two

It can be seen from Fig. 2 that the crankshaft keyway symmetry inspection tool of the present invention includes a dial indicator 3, a keyway plug plate 1 and a watch frame 2, the watch frame 2 is arranged on the end surface of the keyway plug plate 1, and the dial indicator 3 is arranged on the table The front end of the frame 2, the measuring rod cover of the dial indicator 3 passes through the fixing hole, and is connected with the table frame 2 by the set screw 5. The table frame includes an L-shaped right-angle frame, and the top of the L-shaped right-angle frame is fixedly connected with the middle part of the horizontal frame.

The measurement steps of the two implementation methods are the same, and the measurement steps are as follows:

Step 1: Cross-section measurement

First insert the keyway plug plate 1 into the keyway of the crankshaft 4, then put the lower surface of the dial gauge 2 close to the upper surface of the keyway plug plate 1, move the dial frame 2 along the length direction of the keyway plug plate 1, and read the maximum value of the dial gauge 3. value M1; then turn the crankshaft 180°, the lower surface of the meter frame 2 is close to the lower surface of the keyway plug plate 1, repeat the above steps, read the maximum value M2 of the dial indicator 3 in the same section, and obtain the reading difference A=| M1-M2|, the symmetry error of the keyway section is: f1 = A×h/(D-h), where h—the depth of the keyway; D—the diameter of the journal where the keyway is located; A—the readings of the upper and lower corresponding points of the same section The difference is A=|M1-M2|.

Step 2: Measuring along the length direction

Move the gauge frame 2 in the radial direction to maximize the indication of the dial indicator 3, then move along the length direction of the keyway, and take the maximum reading difference between the two points along the length direction as the lengthwise symmetry error f2 of the keyway.

Step Three: Assess

Based on cross-section and longitudinal measurements, the maximum value of the measurement errors in the above two directions, that is, the radial cross-section and the length direction, is taken as the symmetry error f of the center plane of the keyway of the part to the axis of the journal where it is located. f is the maximum value of f1 and f2.

Claims (3)

1. A crankshaft keyway symmetry inspection tool, including a dial indicator (3), characterized in that it also includes a keyway plug plate (1) and a meter frame (2), and the meter frame (2) is arranged on the keyway plug plate (1) ) end face, the dial indicator (3) is arranged at the front end of the meter frame (2), and the dial indicator (3) is connected with the meter frame (2) through a measuring rod sleeve. 2. The crankshaft keyway symmetry inspection tool according to claim 1, characterized in that: said gauge frame (2) is a Z-shaped right-angle frame. 3. The crankshaft keyway symmetry inspection tool according to claim 1, characterized in that: said table frame (2) includes an L-shaped right-angle frame, and the top of the L-shaped right-angle frame is fixedly connected to the middle part of the horizontal frame.

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