Coded ruler for automatically measuring rotation angle of bridge

Abstract

The utility model discloses a bridge rotation angle automatic measurement coding ruler which comprises a coding ruler body, a rotation angle scale area arranged above the coding ruler, a Gray code area arranged below the coding ruler and a photoelectric reading instrument. The coded ruler body is made of stainless steel strips. The coding ruler body is suspended on a bridge turntable, and the coding ruler body is driven to rotate synchronously when a bridge rotates horizontally; the photoelectric reading instrument is U-shaped and is fixedly arranged on a bridge bearing platform; when the coded ruler body rotates, the coded ruler body and the photoelectric reading instrument generate relative displacement; the Gray code area below the coding ruler body is embedded into a U-shaped opening of the photoelectric reading instrument, the photoelectric reading instrument recognizes the Gray code, and the rotation angle of the bridge is determined according to the Gray code. According to the utility model, the measurement efficiency can be obviously improved, automatic measurement is realized, and the measurement result precision is high.

Description

Technical Field

[0001] This utility model relates to the field of horizontal bridge rotation, specifically to an automated measurement and coding ruler for bridge rotation angle. Background Technology

[0002] Horizontal rotation is a common construction technique in bridge construction spanning railways. During the rotation process, it is necessary to monitor the rotation angle and angular velocity in real time to determine the rotation status of the T-structure. Traditionally, rotation angle measurement involves attaching angle strips to a turntable, using pointers to indicate the angle position, and manually reading and recording the angle. However, this method cannot achieve automated measurement and recording.

[0003] To improve the above measurement techniques, there are currently measurement techniques that use wire displacement gauges to measure the linear displacement of the turntable and then convert it into the rotation angle, and there are also measurement techniques that use satellite navigation system receivers to monitor the displacement of the T-beam end of the rotating structure and then convert it into the rotation angle. However, both of these monitoring and measurement techniques have the problems of low measurement efficiency and low accuracy.

[0004] Therefore, to solve the above problems, an automated measurement coded ruler for bridge rotation angle is needed, which can significantly improve measurement efficiency, achieve automated measurement, and provide high accuracy of measurement results. Utility Model Content

[0005] In view of this, the purpose of this utility model is to overcome the defects in the prior art, so as to solve the problems of low accuracy and low efficiency of existing rotating angle strip rulers, and to significantly improve measurement efficiency, realize automated measurement, and achieve high accuracy of measurement results.

[0006] The bridge rotation angle automated measurement coded ruler of this utility model includes:

[0007] The encoder body, the rotation angle scale area set on the top of the encoder, the Gray code area set on the bottom of the encoder, and the photoelectric readout instrument;

[0008] The encoder body is composed of stainless steel strip;

[0009] The encoder body is suspended in the air and mounted on the bridge turntable, so that the encoder body rotates synchronously when the bridge rotates horizontally.

[0010] The photoelectric readout instrument is U-shaped and is fixedly installed on the bridge abutment.

[0011] When the encoder body rotates, the encoder body and the photoelectric readout instrument generate relative displacement;

[0012] The Gray code area below the encoder body is embedded in the U-shaped opening of the photoelectric reader. The photoelectric reader identifies the Gray code and determines the bridge rotation angle based on the Gray code.

[0013] Furthermore, the length L of the encoding ruler body is:

[0014] L=πR*θ m / 180+0.2;

[0015] Where R is the radius of the turntable on the swing bridge; θ m This is the maximum rotation angle.

[0016] Furthermore, the width direction of the encoding ruler body includes a rotation angle scale area and a Gray code area;

[0017] The rotation angle scale area uses colored markings to mark angles every 0.1°. The integer angle grooves are lengthened and printed with numerical markings.

[0018] The spacing between the grooves at each angle is:

[0019] The number of grooves is: The angle is marked starting from 0°, with a maximum value of θ. max The maximum rotation angle θ m Round up.

[0020] Furthermore, a code is created on the encoder body corresponding to each scale line by punching holes. The code is a 10-bit Gray code, with round or square holes representing the number 0 and no holes representing the number 1.

[0021] Furthermore, the bridge rotation angle θ is determined according to the following formula:

[0022]

[0023] Among them, G n G n-1 …G1G0 represents Gray code; n represents the highest number of bits in the Gray code.

[0024] Furthermore, it also includes: calculating the rotational angular velocity V based on the time difference between two adjacent scale divisions:

[0025]

[0026] Where t1 is the time of the previous scale and t2 is the time of the next scale.

[0027] Furthermore, it also includes: correcting the rotation angle at a certain moment according to the following formula:

[0028] θ t+Δt =θ t +Δt×V;

[0029] Where, θ t+Δt Let θ be the rotation angle at time t+Δt; tLet t be the rotation angle at time t; Δt be the time interval; and V be the angular velocity of rotation.

[0030] The beneficial effects of this utility model are as follows: The bridge rotation angle automatic measurement coding ruler disclosed in this utility model uses a photoelectric readout instrument to identify the Gray code on the coding ruler and directly uses the Gray code to obtain the bridge rotation angle, realizing the effect of automatic measurement of the rotation angle, significantly improving the measurement efficiency, and also supporting manual reading. It has the advantages of automatic measurement, self-correction based on coding rules, absolute value measurement, and high accuracy. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0033] The components include: 1. the encoder body; 2. the rotation angle scale area; 3. the Gray code area; 4. the photoelectric readout instrument; and 5. the bridge turntable.

[0034] Figure 2 This is a schematic diagram of the encoding ruler body structure of this utility model. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings, as shown in the figures:

[0036] This embodiment discloses an automated measurement coded ruler for bridge rotation angle, including:

[0037] The encoder body, the rotation angle scale area set on the top of the encoder, the Gray code area set on the bottom of the encoder, and the photoelectric readout instrument;

[0038] The encoder body is composed of stainless steel strip;

[0039] The encoder body is suspended in the air and mounted on the bridge turntable, so that the encoder body rotates synchronously when the bridge rotates horizontally.

[0040] The photoelectric readout instrument is U-shaped and is fixedly installed on the bridge abutment.

[0041] When the encoder body rotates, the encoder body and the photoelectric readout instrument generate relative displacement;

[0042] The Gray code area below the encoder body is embedded in the U-shaped opening of the photoelectric reader. The photoelectric reader identifies the Gray code and determines the bridge rotation angle based on the Gray code.

[0043] During measurement, the horizontal rotation of the bridge causes the coded ruler to rotate synchronously. This results in a relative displacement between the coded ruler and the fixed photoelectric reading instrument. The photoelectric reading instrument identifies the Gray code on the coded ruler and converts it into the actual rotation angle.

[0044] In this embodiment, the encoder ruler can be made of a 0.2mm stainless steel sheet. The length of the stainless steel sheet is determined by the maximum rotation angle and the radius of the turntable on the rotating bridge. The length L of the encoder ruler is:

[0045] L=πR*θ m / 180+0.2;

[0046] Where R is the radius of the turntable on the swing bridge; θ m This represents the maximum rotation angle. The value 0.2 is in meters (m). 0.2 is a blank area set outside the rotation angle when manufacturing the encoder body. This improves reading accuracy and reduces the risk of misreading, while ensuring that the encoder has enough space to adapt to different measurement needs and enhance the user's operating experience.

[0047] like Figure 2 As shown, the encoder body has a rotation angle scale area and a Gray code area in the width direction; the back of the rotation angle scale area has a strong adhesive strip, which is used to fix the encoder body to the lower edge of the turntable side on the rotating bridge during installation. The Gray code area is suspended below the turntable to facilitate the reading of the photoelectric reader.

[0048] The rotation angle scale area uses colored markings to mark angles every 0.1°. The integer angle grooves are lengthened and printed with numerical markings.

[0049] The spacing between the grooves at each angle is:

[0050] The number of grooves is: The angle is marked starting from 0°, with a maximum value of θ. max The maximum rotation angle θ m Round up.

[0051] The encoder body is coded with a 10-bit Gray code for each scale line by punching holes. Round or square holes represent the number 0, and no holes represent the number 1. The 10-bit Gray code can support a maximum encoding requirement of 102.3 degrees, which can meet the rotation angle measurement requirements of general slewing bridges.

[0052] In this embodiment, the conversion formula between Gray code and binary code is as follows:

[0053]

[0054] Therefore:

[0055]

[0056] Where: G n G n-1 …G1G0 is Gray code. It is binary code. This represents the XOR operation; if they are the same, the result is 0, and if they are different, the result is 1.

[0057] The formula for converting binary code to decimal code is as follows:

[0058]

[0059] In the formula: S represents the decimal code.

[0060] The decimal code is calculated as follows: the integer corresponding to the angle represented by the scale line × 10 is first converted into binary code, and then into Gray code.

[0061] The formula for calculating the angle represented by the corresponding tick marks in Gray code is:

[0062]

[0063] Therefore, the bridge rotation angle θ can be determined according to the following formula:

[0064]

[0065] Among them, G n G n-1 …G1G0 represents Gray code; n represents the highest number of bits in the Gray code.

[0066] In this embodiment, the photoelectric reader can be an existing photoelectric reading device. The photoelectric reader includes a vertically arranged array of laser emitters and a laser receiver array, the size of which corresponds to the size of a single barcode on the coding scale. A laser emitter is mounted at the center of the outer top surface of the photoelectric reader, emitting a laser beam vertically upwards to indicate the reading scale position, thus assisting in manual reading. During initial installation, it should be aligned with the 0 position on the scale line.

[0067] Photoelectric readout instruments determine the on / off state (bright or dark) of a Gray code position by detecting the laser signal emitted by the transmitter and received by the receiver, thereby determining the Gray code value. In actual measurement, such as... Figure 1 As shown, the photoelectric readout is fixedly installed on the bridge pier and remains stationary during the bridge rotation. When the bridge rotates, the turntable drives the encoder body to move relative to the photoelectric readout. The position of the encoder body relative to the photoelectric readout changes, i.e., relative displacement occurs. This displacement reflects the angle of bridge rotation, thus indicating and reading the rotation angle.

[0068] In this embodiment, the photoelectric readout instrument can calculate the rotational angular velocity V based on the time interval between two consecutive scale divisions. If the time of passing the previous scale division is t1 and the time of passing the next scale division is t2, the specific calculation method is as follows:

[0069]

[0070] Furthermore, since the rotational angular velocity is relatively slow, its angle change can be considered linear over a short period. To improve the display accuracy to 0.01°, predictive interpolation can be used to predict the angle at future times. Therefore, the angle at time t+Δt is the rotational angle at time t + Δt × V, which can be rounded to an accuracy of 0.01°. The rotational angle at a certain moment is corrected according to the following formula:

[0071] θ t+Δt =θ t +Δt×V;

[0072] Where, θ t+Δt Let θ be the rotation angle at time t+Δt; t Let t be the rotation angle at time t; Δt be the time interval; and V be the angular velocity of rotation.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An automated measuring and coding ruler for bridge rotation angle, characterized in that: include: The encoder body, the rotation angle scale area set on the top of the encoder, the Gray code area set on the bottom of the encoder, and the photoelectric readout instrument; The encoder body is made of stainless steel strip; The encoder body is semi-suspended on the bridge turntable, and drives the encoder body to rotate synchronously when the bridge rotates horizontally. The photoelectric readout instrument is U-shaped and is fixedly installed on the bridge abutment. When the encoder body rotates, the encoder body and the photoelectric readout instrument generate relative displacement; The Gray code area below the encoder body is embedded in the U-shaped opening of the photoelectric reader. The photoelectric reader identifies the Gray code and determines the bridge rotation angle based on the Gray code.

2. The automated bridge rotation angle measurement encoder according to claim 1, characterized in that: The length L of the encoder body is: L=πR*θ m / 180+0.2; Where R is the radius of the turntable of the rotating bridge; θ m This is the maximum rotation angle.

3. The automated bridge rotation angle measurement encoder according to claim 2, characterized in that: The encoder body has a rotation angle scale area and a Gray code area in the width direction; The rotation angle scale area uses colored markings to mark angles every 0.1°. The integer angle grooves are lengthened and printed with numerical markings. The spacing between the grooves at each angle is: The number of grooves is: The angle is marked starting from 0°, with a maximum value of θ. max The maximum rotation angle θ m Round up.

4. The bridge rotation angle automated measurement coding ruler according to claim 3, characterized in that: The coding scale body is coded with a 10-digit Gray code by punching holes. Round or square holes represent the number 0, and no holes represent the number 1.

5. The automated bridge rotation angle measurement encoder according to claim 1, characterized in that: The bridge rotation angle θ is determined according to the following formula: Among them, G n G n-1 …G1G0 represents Gray code; n represents the highest number of bits in the Gray code.

6. The automated bridge rotation angle measurement coded ruler according to claim 1, characterized in that: Also includes: Calculate the rotational angular velocity V using the time difference between two adjacent scale divisions: Where t1 is the time of the previous scale and t2 is the time of the next scale.

7. The automated bridge rotation angle measurement coded ruler according to claim 6, characterized in that: Also includes: The rotation angle at a certain moment is corrected according to the following formula: i t+Δt =θ t +Δt×V; Where, θ t+Δt Let θ be the rotation angle at time t+Δt; t Let t be the rotation angle at time t; Δt be the time interval; and V be the angular velocity of rotation.

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