A measuring mechanism and method for measuring the angle of rotation of a rocker arm

Abstract

The present application belongs to the field of measurement, and relates to a measuring mechanism and method for measuring the rotation angle of a rocker arm. The mechanism comprises a protractor, a first adjusting knob, a first connecting rod, a first suction cup, a second connecting rod, a second suction cup, a third suction cup and an adjusting rod, wherein the two ends of the adjusting rod are respectively a first adjustable connecting rod and a second adjustable connecting rod; the first suction cup, the second suction cup and the third suction cup each comprise a mounting rod and a suction cup body; one end of the first connecting rod is hingedly connected to the mounting rod of the first suction cup as a hinge point A, and the other end of the first connecting rod is hingedly connected to the end of the first adjustable connecting rod and the center point of the protractor as a hinge point B; one end of the second connecting rod is hingedly connected to the mounting rod of the second suction cup as a hinge point D, and the other end of the second connecting rod is hingedly connected to the middle section of the adjusting rod as a hinge point C; the end of the second adjustable connecting rod is hingedly connected to the mounting rod of the third suction cup as a hinge point E; an arc-shaped through slot is arranged on the protractor, and the first adjusting knob is arranged at the arc-shaped through slot for fixing the first connecting rod and the protractor.

Description

Technical Field

[0001] This invention belongs to the field of measurement and relates to a measuring mechanism and method that can be used to measure the rotation angle of a rocker arm. Background Technology

[0002] When adjusting the aircraft control system, only the input and output parameters are often specified, while the intermediate rocker arm angle is only theoretically calculated without specific regulations and is difficult to measure. This leads to significant differences in the intermediate rocker arm angle among aircraft of the same model and batch. Displacement sensors indirectly measure the intermediate rocker arm angle and convert it into input displacement, which is then transmitted to the flight data recorder. This results in significant errors from the displacement sensors. Existing levels are bulky and cannot dynamically measure the rocker arm angle, nor can they measure horizontal rotation. Traditional protractors require placement near the axis of rotation for reading, and due to space limitations near the axis, manually fixing the protractor introduces significant errors. Summary of the Invention

[0003] Purpose of the invention: To provide a measuring mechanism and method for measuring the rotation angle of a rocker arm, solving the problems of difficulty in measuring the rotation angle of a rocker arm on a machine and insufficient space.

[0004] Technical solution:

[0005] A measuring mechanism for measuring the rotation angle of a rocker arm includes: a protractor 1, a first adjusting knob 2, a first connecting rod 3, a first suction cup 4, a second connecting rod 6, a second suction cup 7, a third suction cup 9, and an adjusting rod. The adjusting rod has a first adjustable connecting rod 5 and a second adjustable connecting rod 8 at its two ends. The first suction cup 4, the second suction cup 7, and the third suction cup 9 each include a mounting rod and a suction cup body. One end of the first connecting rod 3 is hinged to the mounting rod of the first suction cup 4 as a hinge point A. The other end of the first connecting rod 3... One end of the first adjustable connecting rod 5 is hinged to the end of the first adjustable connecting rod 5 and the center point of the protractor 1 as hinge point B; one end of the second connecting rod 6 is hinged to the mounting rod of the second suction cup 7 as hinge point D, and the other end of the second connecting rod 6 is hinged to the middle section of the adjusting rod as hinge point C; the end of the second adjustable connecting rod 8 is hinged to the mounting rod of the third suction cup 9 as hinge point E; the protractor 1 is provided with an arc-shaped through groove, and the first adjusting knob 2 is located at the arc-shaped through groove to fix the first connecting rod 3 and the protractor 1.

[0006] Furthermore, one end of the first connecting rod 3 is fitted onto the outer circle of the hollow pin, and the inner hole of the hollow pin is threaded for connection with the mounting rod of the first suction cup 4.

[0007] Furthermore, a positioning screw is provided on the first connecting rod 3, the positioning screw passes through the arc-shaped through groove, and the first adjusting knob 2 is provided with a thread to be connected and fixed with the positioning screw.

[0008] Furthermore, the middle section of the adjusting rod is a fixed section, and the two ends are adjusting sections corresponding to the first adjustable connecting rod 5 and the second adjustable connecting rod 8 respectively. The two ends of the fixed end have an axial central hole structure and a straight groove is provided on the side. The first adjustable connecting rod 5 and the second adjustable connecting rod 8 are respectively provided with positioning screws and arranged through the straight grooves. The second adjusting knob 10 and the third adjusting knob 11 are connected to the positioning screws to fix the fixed end and the adjusting section.

[0009] Furthermore, the protractor 1 is provided with scale lines.

[0010] A method for measuring the rotation angle of a rocker arm, the method being performed by means of the aforementioned measuring mechanism, the method comprising:

[0011] With the rocker arm rotation center determined, the first adjustable link 5 and the second adjustable link 8 can be of arbitrary length and are locked.

[0012] Align the hinge point E with the rotation center O, attach the first adjustable link 5 and the second adjustable link 8 to the rocker arm, and mark the hinge points C and B.

[0013] Install the first suction cup 4 and the second suction cup 7 into the positions marked B and C;

[0014] Install the third suction cup 9 and connect it to the body. At this time, there are parallelograms ODCE and ABCD. Loosen the first adjustment knob 2. Move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5. Lock the first adjustment knob 2. At this time, the protractor 1 is fixedly connected to the first link 3.

[0015] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

[0016] A method for measuring the rotation angle of a rocker arm, the method being performed by means of the aforementioned measuring mechanism, the method comprising:

[0017] When two points of the rocker arm and their dimensions relative to the rocker arm rotation center are determined, BC is respectively aligned with the two points and the first adjustable link 5 is locked. The length of CE is adjusted to the distance between the point closer to the rocker arm rotation center and the rocker arm rotation center O and the second adjustable link 8 is locked.

[0018] Install the first suction cup 4 and the second suction cup 7 at the two points determined on the rocker arm;

[0019] Install the third suction cup 9 and connect it to the body. At this time, there are parallelograms ODCE and ABCD. Loosen the first adjustment knob 2. Move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5. Lock the first adjustment knob 2. At this time, the protractor 1 is fixedly connected to the first link 3.

[0020] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

[0021] 8. A method for measuring the rotation angle of a rocker arm, characterized in that the method is performed by means of a measuring mechanism according to any one of claims 1-5, the method comprising:

[0022] If the center of rotation of the rocker arm cannot be determined and the size of the rocker arm is unknown, and the initial position of the rocker arm is vertical, lock the first adjustable link 5 and attach it to the rocker arm, and mark it at C and B.

[0023] Install the first suction cup 4 and the second suction cup 7 into the positions marked B and C;

[0024] Adjust the second adjustable link 8 to any length and lock it, so that the first link 3, the second link 6, the first adjustable link 5 and the second adjustable link 8 are collinear, and then fix the suction cup 9, i.e., the hinge E.

[0025] Rotate the rocker arm. During the movement, if the first link 3 or the second link 6 is always in the vertical direction, the hinge point E is the rotation point.

[0026] Install the third suction cup 9 and connect it to the body. At this time, there are parallelograms ODCE and ABCD. Loosen the first adjustment knob 2. Move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5. Lock the first adjustment knob 2. At this time, the protractor 1 is fixedly connected to the first link 3.

[0027] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

[0028] A method for measuring the rotation angle of a rocker arm, the method being performed by means of the aforementioned measuring mechanism, the method comprising:

[0029] If the center of rotation of the rocker arm cannot be determined and the size of the rocker arm is unknown, and if the initial position of the rocker arm is not vertical, lock the first adjustable link 5 to any length and attach it to the rocker arm, and mark it at C and B.

[0030] Install the first suction cup 4 and the second suction cup 7 into the positions marked B and C;

[0031] Mark point O on the rocker arm axis on the extension line of line AD;

[0032] Adjust the second adjustable link 8 to any length and lock it, so that the first link 3, the second link 6, the first adjustable link 5 and the second adjustable link 8 are collinear, and then fix the third suction cup 9, i.e., the hinge E.

[0033] Rotate the rocker arm. During the movement, the first link 3 or the second link 6 is always parallel to the OE direction. At this time, the hinge point E is the rotation point.

[0034] Install the third suction cup 9 and connect it to the body. At this time, there are parallelograms ODCE and ABCD. Loosen the first adjustment knob 2. Move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5. Lock the first adjustment knob 2. At this time, the protractor 1 is fixedly connected to the first link 3.

[0035] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

[0036] Beneficial effects:

[0037] This invention discloses a measuring mechanism for measuring the rotation angle of a rocker arm, specifically a simple parallelogram measuring mechanism. It eliminates the need for a level and inclinometer, requires no manual fixing of the protractor, and does not occupy space at the pivot point. It can measure horizontal rotation angles. It is easy to install and remove, and the rocker arm rotation angle can be quickly read after installation. This solves the problems of difficulty in measuring rocker arm rotation angles on a machine and insufficient space. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the measuring mechanism of the present invention that can be used to measure the rocker arm rotation angle;

[0039] Figure 2 These are two types of suction cups;

[0040] Figure 3 This is a diagram showing the installation and use of a measuring mechanism that can be used to measure the angle of a rocker arm.

[0041] Figure 4 A schematic diagram showing the first link, second link, first adjustable link, and second adjustable link collinear when the rocker arm rotation center cannot be determined and the rocker arm size is unknown;

[0042] Figure 5 A schematic diagram of the rocker arm rotation process when the rocker arm rotation center cannot be determined and the rocker arm size is unknown.

[0043] Among them, 1 is the protractor, 2 is the first adjustment knob, 3 is the first connecting rod, 4 is the first suction cup, 5 is the first adjustable connecting rod, 6 is the second connecting rod, 7 is the second suction cup, 8 is the second adjustable connecting rod, 9 is the third suction cup, 10 is the adjustment knob, and 11 is the adjustment knob. Detailed Implementation

[0044] To address the aforementioned technical problems, this invention provides a measuring mechanism that can be used to measure the rotation angle of a rocker arm. For example... Figure 1 As shown

[0045] A simple angle measuring device is provided, which can indirectly measure the rocker arm deflection angle based on the principle that opposite angles of a parallelogram are equal. It consists of four connecting rods: first connecting rod 3, first adjustable connecting rod 5, second connecting rod 6, and second adjustable connecting rod 8 (first connecting rod 3 and second connecting rod 6 are of equal length; where first adjustable connecting rod 5 and second adjustable connecting rod 8 are adjustable rods, and are coaxial and do not rotate relative to each other), a transparent protractor 1, three adjusting knobs (first adjusting knob 2, second adjusting knob 10, and third adjusting knob 11), and three suction cups (first suction cup 4, second suction cup 7, and third suction cup 9) (connected by threads, detachable, and available in two forms, see...). Figure 2 A, B, C, D, and E are hinge points (all hinge points are hollow and can be used for marking and connecting suction cups). The adjustment knob uses friction to lock the relative movement of the two parts. The protractor is used for reading, and the suction cup is used to connect to the machine body and the rocker arm.

[0046] Combination Figure 1 A simple measuring mechanism is provided. The measuring method is as follows:

[0047] 1. Find the center of rotation of the rocker arm:

[0048] 1.1 The center of rotation of the rocker arm or the dimensions of the rocker arm are known:

[0049] 1.1.1 The center of rotation of the rocker arm is known.

[0050] The first adjustable link 5 and the second adjustable link 8 are of arbitrary length and are locked.

[0051] Align the hinge point E with the rotation center O, attach the first adjustable link 5 and the second adjustable link 8 to the rocker arm, and mark the hinge points C and B.

[0052] Install the first suction cup 4 and the second suction cup 7 into the positions marked B and C;

[0053] Install the third suction cup 9 and connect it to the main body, such as Figure 3 At this time, parallelograms ODCE and ABCD exist. Loosen the first adjustment knob 2; move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5, and lock the first adjustment knob 2. At this time, the protractor 1 and the first link 3 are fixedly connected.

[0054] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

[0055] 1.1.2 The dimensions of the rocker arm are known.

[0056] When two points of the rocker arm and their dimensions relative to the rocker arm rotation center are determined, BC is respectively aligned with the two points and the first adjustable link 5 is locked. The length of CE is adjusted to the distance between the point closer to the rocker arm rotation center and the rocker arm rotation center O and the second adjustable link 8 is locked.

[0057] Install the first suction cup 4 and the second suction cup 7 at the two points determined on the rocker arm;

[0058] Install the third suction cup 9 and connect it to the body. At this time, there are parallelograms ODCE and ABCD. Loosen the first adjustment knob 2. Move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5. Lock the first adjustment knob 2. At this time, the protractor 1 is fixedly connected to the first link 3.

[0059] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

[0060] 1.2 The center of rotation of the rocker arm cannot be determined, and the size of the rocker arm is unknown.

[0061] If the center of rotation of the rocker arm cannot be determined and the size of the rocker arm is unknown, and the initial position of the rocker arm is vertical, lock the first adjustable link 5 and attach it to the rocker arm, and mark it at C and B.

[0062] Install the first suction cup 4 and the second suction cup 7 into the positions marked B and C;

[0063] Adjust the second adjustable link 8 to any length and lock it, so that the first link 3, the second link 6, the first adjustable link 5, and the second adjustable link 8 are collinear (e.g., Figure 4 After that, fix the suction cup 9, i.e., the hinge E (which can be done by hand or mounted on the frame);

[0064] Rotate the rocker arm. During the movement, if either the first link 3 or the second link 6 remains vertical (e.g.) Figure 5 At this point, the hinge point E is the rotation point;

[0065] Install the third suction cup 9 and connect it to the body. At this time, there are parallelograms ODCE and ABCD. Loosen the first adjustment knob 2. Move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5. Lock the first adjustment knob 2. At this time, the protractor 1 is fixedly connected to the first link 3.

[0066] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

[0067] If the center of rotation of the rocker arm cannot be determined and the size of the rocker arm is unknown, and if the initial position of the rocker arm is not vertical, lock the first adjustable link 5 to any length and attach it to the rocker arm, and mark it at C and B.

[0068] Install the first suction cup 4 and the second suction cup 7 into the positions marked B and C;

[0069] Mark point O on the rocker arm axis on the extension line of line AD;

[0070] Adjust the second adjustable link 8 to any length and lock it, so that the first link 3, the second link 6, the first adjustable link 5, and the second adjustable link 8 are collinear (e.g., Figure 4 After that, fix the third suction cup 9, i.e., hinge E (which can be done by hand or mounted on the frame);

[0071] Rotate the rocker arm, and during the movement, either the first link 3 or the second link 6 remains parallel to the OE direction (e.g., Figure 5 At this point, the hinge point E is the rotation point;

[0072] Install the third suction cup 9 and connect it to the body. At this time, there are parallelograms ODCE and ABCD. Loosen the first adjustment knob 2. Move the transparent protractor 1 to align its 0 mark with the center line of the first adjustable link 5. Lock the first adjustment knob 2. At this time, the protractor 1 is fixedly connected to the first link 3.

[0073] When the rocker arm is rotated, the first adjustable link 5 and the second adjustable link 8 move accordingly, with the same relative rotation angle. The reading on the dial at this time is the rocker arm rotation angle.

Claims

1. A measuring mechanism usable for measuring a swing angle of a rocker arm, characterized by, The angle measuring device comprises: an angle scale, a first adjusting knob, a first connecting rod, a first suction disc, a second connecting rod, a second suction disc, a third suction disc, an adjusting rod, wherein the two ends of the adjusting rod are respectively a first adjustable connecting rod and a second adjustable connecting rod; the first suction disc, the second suction disc and the third suction disc each comprise a mounting rod and a suction disc body; one end of the first connecting rod is hingedly connected to the mounting rod of the first suction disc as a hinge point A, and the other end of the first connecting rod is hingedly connected to the end of the first adjustable connecting rod and the center point of the angle scale as a hinge point B; one end of the second connecting rod is hingedly connected to the mounting rod of the second suction disc as a hinge point D, and the other end of the second connecting rod is hingedly connected to the middle section of the adjusting rod as a hinge point C; the end of the second adjustable connecting rod is hingedly connected to the mounting rod of the third suction disc as a hinge point E; an arc-shaped through slot is arranged on the angle scale, and the first adjusting knob is arranged at the arc-shaped through slot for fixing the first connecting rod and the angle scale, the use method of the measuring mechanism, comprising: in the case that the rotating center of the rocker arm cannot be determined and the size of the rocker arm is unknown, if the initial position of the rocker arm is not in the vertical direction, the first adjustable connecting rod is locked at any length and attached to the rocker arm, and marks are made at points C and B; the first suction disc and the second suction disc are installed at the mark positions B and C; a point O is marked on the extension line of the AD connecting line on the rocker arm shaft; the second adjustable connecting rod is adjusted to any length and locked, and the first connecting rod, the second connecting rod, the first adjustable connecting rod and the second adjustable connecting rod are collinear, and then the third suction disc, i.e. the hinge E, is fixed; the rocker arm is rotated, and the first connecting rod or the second connecting rod is always parallel to the OE direction in the movement process, and at this time the hinge point E is the rotation point; the third suction disc is installed and connected to the machine body, at this time there are parallelograms ODCE and ABCD, and the first adjusting knob is loosened; the 0 scale line of the transparent angle scale is aligned with the center line on the first adjustable connecting rod by rotating the transparent angle scale, and the first adjusting knob is locked, at this time the angle scale is fixedly connected with the first connecting rod; the rocker arm is rotated, the first adjustable connecting rod and the second adjustable connecting rod follow the movement, and the relative rotation angle is consistent, and at this time the reading on the dial is the rotation angle of the rocker arm.

2. The measuring mechanism according to claim 1, characterized in that One end of the first connecting rod is sleeved on the outer circle of the hollow pin shaft, and the inner hole of the hollow pin shaft is provided with threads for connecting with the mounting rod of the first suction disc.

3. The measuring mechanism of claim 1, wherein, A positioning screw is arranged on the first connecting rod, the positioning screw passes through the arc-shaped through slot, and the first adjusting knob is provided with threads connected with the positioning screw for fixation.

4. The measuring mechanism of claim 1, wherein, The middle section of the adjusting rod is a fixed section, and the two ends are adjusting sections corresponding to the first adjustable connecting rod and the second adjustable connecting rod, the two ends of the fixed end are axially provided with hole structures, the side surface is provided with a straight slot, the first adjustable connecting rod and the second adjustable connecting rod are respectively provided with positioning screws and are arranged through the straight slot, and the second adjusting knob and the third adjusting knob are connected with the positioning screws to fix the fixed end and the adjusting section.

5. The measuring mechanism of claim 1, wherein, The angle scale is provided with scale lines.

6. A method for measuring the angle of rotation of a rocker arm, characterized in that, The method is performed by means of the measuring mechanism of any one of claims 1-5, and the method comprises: in the case that the rotating center of the rocker arm is determined, the first adjustable connecting rod and the second adjustable connecting rod are of any length and are locked; the hinge point E is overlapped with the rotating center O, the first adjustable connecting rod and the second adjustable connecting rod are attached to the rocker arm, and marks are made at the hinge points C and B; the first suction disc and the second suction disc are installed at the mark positions B and C; Install the third suction disc to the machine body, at this time there are parallelogram ODCE and ABCD, loosen the first adjusting knob; adjust the transparent protractor to align the 0 scale line with the center line on the first adjustable connecting rod, lock the first adjusting knob, at this time the protractor is fixed to the first connecting rod; Rotate the rocker arm, the first adjustable connecting rod and the second adjustable connecting rod follow, the relative rotation angle is consistent, at this time the reading on the dial is the rotation angle of the rocker arm.

7. A method for measuring the angle of rotation of a rocker arm, characterized in that, The method is performed by means of the measuring mechanism of any one of claims 1-5, the method comprising: When determining two points of the rocker arm and the distance between the two points and the rotation center of the rocker arm, BC corresponds to the two points respectively and locks the first adjustable connecting rod, the length of CE is adjusted to the distance between the point closer to the rotation center of the rocker arm and the rotation center O of the rocker arm and the second adjustable connecting rod is locked; Install the first suction disc and the second suction disc to the two points determined on the rocker arm; Install the third suction disc to the machine body, at this time there are parallelogram ODCE and ABCD, loosen the first adjusting knob; adjust the transparent protractor to align the 0 scale line with the center line on the first adjustable connecting rod, lock the first adjusting knob, at this time the protractor is fixed to the first connecting rod; Rotate the rocker arm, the first adjustable connecting rod and the second adjustable connecting rod follow, the relative rotation angle is consistent, at this time the reading on the dial is the rotation angle of the rocker arm.

8. A method for measuring the angle of rotation of a rocker arm, characterized in that, The method is performed by means of the measuring mechanism of any one of claims 1-5, the method comprising: In the case that the rotation center of the rocker arm cannot be determined and the size of the rocker arm is unknown, if the initial position of the rocker arm is the vertical direction, lock the first adjustable connecting rod after pasting on the rocker arm, mark at C and B; Install the first suction disc and the second suction disc to the B and C mark positions; Adjust the second adjustable connecting rod to any length and lock, after the first connecting rod, the second connecting rod, the first adjustable connecting rod and the second adjustable connecting rod are collinear, fix the suction disc 9, i.e. the hinge E; Rotate the rocker arm, during the movement, if the first connecting rod or the second connecting rod is always in the vertical direction, at this time the hinge point E is the rotation point; Install the third suction disc to the machine body, at this time there are parallelogram ODCE and ABCD, loosen the first adjusting knob; adjust the transparent protractor to align the 0 scale line with the center line on the first adjustable connecting rod, lock the first adjusting knob, at this time the protractor is fixed to the first connecting rod; Rotate the rocker arm, the first adjustable connecting rod and the second adjustable connecting rod follow, the relative rotation angle is consistent, at this time the reading on the dial is the rotation angle of the rocker arm.

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