JPS5818106A - Measuring device for propeller pitch - Google Patents

Abstract

PURPOSE:To decrease individual error in measurement and to make the measurement easy, by detecting and processing the amount of descent of a spindle movable in parallel with the shaft center of a propeller and a rotary angle of an arm. CONSTITUTION:Adjustment is performed that a horizontal arm 5 comes on a measuring reference position S of a propeller wind 3. For example, when a spindle 8 is fallen down until it contacts with the surface of a wing 3, an electric circuit of a spindle stopper is closed and an electromagnet adsorbs the spindle 8. The indication of a display is set to 0 and a reset switch of the power supply is opened, and the arm 5 is rotated by a measuring rotary angle 0. Further, an end 8a to be measured of the spindle 8 is fallen down until the end contacts with the wing 3, the amount of descent is detected by a detector and the pitch P is calculated with an operation device for display.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the pitch of propeller blades (propeller pitch).

Generally, at the final stage of manufacturing a marine propeller, a measurement check is required to check whether the pitch of the propeller blades is as planned.

Note that the pitch of the propeller blades is defined as the propeller's one revolution (36
This refers to the distance traveled forward when the vehicle rotates by 0°.

To measure the pitch of such propeller blades, the propeller is installed so that its axis is perpendicular, and it can be swiveled to a support that is set vertically so that it is coaxial with the propeller axis. A horizontal arm is provided, and a spindle is provided on the measuring instrument box body which is horizontally movably provided on this arm so as to be movable up and down. Next, at the measurement reference point of the propeller blade and at a measurement point shifted from the same reference point by a measurement angle θ centered on the propeller axis, calculate the amount of descent of the spindle when the measurement end of the spindle touches the propeller blade surface. The propeller pitch is measured based on this descending scale and the measurement angle θ.

However, conventionally, gears and a large disk for pitch reading have been used as a means to measure the propeller pitch based on the spindle descent ih and the measurement angle θ, so the entire device has a heavy structure. As a result, there is a problem that the dimensions of each part of the support column and horizontal arm that support these become large, and there is also a problem that the scale on the disk becomes congested, making it difficult to read and that individual differences in measurement tend to occur. .

The present invention aims to solve these problems.
To provide a propeller pitch measuring device which is easy to measure with little individual difference in measurement and has a light structure.

Therefore, the propeller pitch measuring device of the present invention includes: a support that is disposed coaxially with the axis of the propeller; an arm that is fitted to the support so that it can rotate around the support;
a moving mechanism capable of moving along the longitudinal direction of the arm; a spindle provided in the moving mechanism capable of moving parallel to the axis of the propeller; and a movement amount detector detecting the amount of movement of the spindle; a calculator that calculates a propeller pitch by receiving information about the rotation angle of the arm from a reference position and the amount of movement of the measurement end of the spindle toward the propeller blade surface;
It is characterized by being equipped with a display that displays the propeller pitch based on the signal from the calculator.

Hereinafter, a propeller pitch measuring device as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a plan view thereof, Fig. 2 is a front view thereof, and Fig. 3 is a view taken along line nr-m in Fig. 2. 4 is an enlarged perspective view showing the moving mechanism, FIG. 5 is an explanatory view of the spindle stopper, and FIG. 6 is a block diagram thereof.

As shown in FIGS. 1 and 2, a marine propeller 1 is arranged horizontally. That is, the propeller boss 2 is arranged so that its axis O is perpendicular.

In this embodiment, only one of the propeller blades 3 is shown.

Further, a support 4 is provided coaxially with the propeller axis O, and a horizontal arm 5
It is pivoted so that it can rotate.

Further, the horizontal arm 5 is provided with a moving mechanism 6 that can move along its longitudinal direction, and this moving mechanism 6
It consists of a pinion (not shown) that meshes with a rack 5a carved into the horizontal arm 5, and a nozzle 7 that rotationally drives this pinion. Note that the pinion portion is covered by a case 61.

Further, the case 61 of the moving mechanism 6 is provided with a spindle 8 in a direction parallel to the axis O of the propeller 1, that is, in a vertical direction, as shown in FIGS.
1 by operating the spindle 9 provided on the spindle 8.
The spindle 8 can be moved up and down with respect to the case 61 by rotating a pinion that meshes with a rack carved into the wall of the case 61. .

As shown in FIG. 5, a spindle stopper 11 is provided close to the spindle 8, and this spindle stopper 11 closes the electric circuit at the moment the measuring end 8a of the spindle 8 comes into contact with the propeller blade surface. The electromagnet 12 attracts the spindle 8'1 to prevent the spindle 8 from moving up or down more than n times.

Note that the reference numeral 13 in FIG. 5 indicates a power supply section having a reset switch function.

Further, the propeller blade 1 and the spindle 8 are made of a conductive material.

Incidentally, as shown in FIG. 6, a movement amount detector 16 for detecting the amount of vertical movement of the spindle 8 is provided inside the case 61. As the movement amount detector 16, various types of detectors can be used, such as one using a variable resistor and one using a differential transformer.

Furthermore, the case 61 includes a measurement rotation angle input knob 1.
0 is provided, and this knob 10 has a knob 1.
An angle signal generator 17 that outputs an electrical signal according to a set angle θ of 0 is connected.

Note that this angle signal generator 17 is built in the case 61, and as this angle signal generator 17, one using a variable resistor or the like is used.

Further, the computing unit 18 provided in the case 61 receives information corresponding to the rotation angle θ of the horizontal arm 5 from the reference position S from the angle signal generator 17, and also receives information corresponding to the rotation angle θ of the horizontal arm 5 from the reference position S.
Information corresponding to the amount of movement of the measuring end 8a of the propeller blade toward the surface of the propeller blade is received from the movement amount detector 16.

Here, the amount of movement is the height difference between reference point A and measurement point B (see Fig. 3).

The calculator 18 has a calculation function that can calculate the propeller pitch P (=360h/θ) in response to the above information, and outputs an output signal corresponding to the propeller pitch P from the calculator 18. is input to a digital propeller pitch display 15, and the propeller pitch P is displayed on this display 15 as shown in FIG.

The case 61 has a rotation speed of the handle 7.
A digital distance indicator 14 for displaying the horizontal distance X from the propeller axis O is provided.

Also, handle 7.9. Knob lO and indicator 14.
15 are collectively arranged on the panel surface of the n case 61, as shown in FIG.

Note that the symbols 0.3R, 0, 4R, . . . , 0.3R in FIG.
9R indicates a propeller pitch measurement point along the radial direction of the propeller 3 having a radius R.

According to the above-mentioned configuration, in order to measure the propeller pitch P, first rotate the horizontal arm 5 and adjust it so that it is above the measurement reference position S of the propeller blade 3, as shown in FIG. do.

For example, when measuring the propeller pitch P at measurement point 0.3H, the handle 7 is operated to move the moving mechanism 6 along the horizontal arm 5, and the digital display 14
Stop at the position where the numbers Q, 3 and R appear. □ Since the value of the general value is determined by the propeller 1, the values of Q and 3XR can be specifically displayed on the display 14 by storing specific numbers of the general value in advance.

After the moving mechanism 6 is set at the measurement point 0.3H in this manner, the spindle 9 is operated to lower the spindle 8 until it touches the surface of the propeller blade 3.

By lowering the spindle 8 in this way, when the measurement end 8a of the spindle 8 comes into contact with the propeller blade 3, the electric circuit of the spindle stopper 11 is closed at that moment, and the electromagnet 12 attracts and fixes the spindle 8. do.

In this state, the numerical value displayed on the display 14 is reset to O''.

Next, the power supply section 13 in the spindles)/:11
After opening the reset switch attached to demagnetize the electromagnet 12, rotate the horizontal arm 5 by a measurement rotation angle of 0, for example, 30 degrees from the measurement reference position S, and set the measurement rotation angle input knob 10 to 30 degrees. .

After the horizontal arm 5 has been turned in this manner, the handle 9 is operated to lower the measuring end 8a of the spindle 8 until it comes into contact with the surface of the propeller blade 3.

Then, when the spindle 8 comes into contact with the propeller blade 3, the spindle stopper 11 is activated again.

The movement amount detector 16 indicates the amount of spindle descent from f'LK.
Information on the amount of spindle descent is input to the calculator 18, and a signal corresponding to the rotation angle θ set by the knob 10 is input to the angle signal generator 17. In order to input n, the calculator 18 calculates the propeller pitch P by calculating 360h/θ, and then the propeller pitch P is displayed on the display 15.

Further, by performing the above-described operation from each measurement point 0.4R to 0.7R, the propeller blade pitch at each measurement point up to measurement point 0.7R can be measured.

Note that after the measurement point 0.8 R, the tip of the propeller becomes blunt, so measurement at the rotation angle of 30° is not possible. Therefore, change the rotation angle θ and make measurements. In this case, for example, the meter is: j1. For 0.8R, measurement is performed at the position of θ = 20°, f, and for 0.9R, measurement is performed at the position of θ = 10°. It will be done.

Additionally, since the dimension X from the propeller axis O is displayed on the digital display 14, the rake and radius R of the propeller 1 can also be measured.

Note that it is also possible to display the spindle drop scale on the display 15 once and then display the propeller pitch P.

In addition, as a display means, other types of printing or audio can be used.

Furthermore, it is also possible to automatically stop the water near arm 5 at the turning position 1 created by the angle I of the knob 10 using a similar device.

In addition to being used in a state in which the propeller 1 is mounted on a water droplet as in the above-mentioned embodiment, the device may also be used in a state in which the propeller 1 is supported vertically. According to the propeller pitch measuring device of the invention, the propeller pitch P = 360 based on the Novi/Dollar drop scale and the rotation angle θ.
Since the calculation h/θ is performed and the result is displayed, the overall structure of the device can be made light, the propeller pitch P can be easily read, and there is no measurement error due to individual differences of 1τ. be.

[Brief explanation of drawings]

The figures show a propeller pitch measuring device as an example of the present invention, in which Fig. 1 is a plan view thereof, Fig. 2 is a front view thereof, and Fig. 3 is a cross section taken along the line ■-■ in Fig. 2. 4 is an enlarged perspective view of the moving mechanism, FIG. 5 is an explanatory diagram of the spindle stopper, and FIG. 67 is a block diagram thereof. 1. Propeller, 2. Propeller hos, 3. Propeller blade, 4. Support, 5. Horizontal arm, 5a. Rack,
6. Movement mechanism, 7. Handle, 8. Spindle,
8a...Measuring end of spindle, 9...Handle, 10...
・Knob for inputting measurement rotation angle, 11... Spindle stopper, 12... FIA stone, 13... Power supply unit with reset switch function, 14. 15... Display, 16... Movement amount detector, 17... Angle signal generator, 18...Arithmetic unit, 61...Case. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 4 Figure 5 Figure 7 Figure 6

Claims (1)

[Claims] A column arranged coaxially with the axis of the propeller, an arm fitted to the column so as to be able to rotate around the column, and a movement mechanism capable of moving along the longitudinal direction of the arm. , a spindle provided in the movement mechanism and capable of moving parallel to the axis of the propeller, a movement amount detector that detects the amount of movement of the spindle, and a rotation angle of the arm from a reference position and the spindle. It is characterized by being equipped with a calculator that calculates the propeller pitch based on information about the amount of movement of the measuring end of the blade toward the surface of the propeller blade, and a display that displays the propeller pitch based on the signal from the calculator. A propeller pitch measuring device.