A high-precision calibration device for a low-precision split-type resistance potentiometer

Abstract

The utility model relates to a kind of high-precision calibration device of low-precision split type resistance potentiometer, belong to photoelectric accurate guidance technical field.The device calibrates low-precision potentiometer using high-precision photoelectric encoder, after calibration is completed, low-precision resistance potentiometer can have the angular precision of high-precision photoelectric encoder.Due to the calibration device can calibrate in the state of whole machine without ball cover or the state of stable platform assembly completion, can greatly improve the application range of split type resistance potentiometer, without high-precision assembly, to reduce the assembly difficulty;Due to the price of split type resistance potentiometer is usually one sixth of the price of hall sensor, one tenth of the price of photoelectric encoder, can greatly reduce use cost.At the same time, due to its split type layout is not encapsulated metal shell, small space occupation, light weight, solve the miniaturization, light weight and low cost problem of stable platform potentiometer in small-caliber seeker.

Description

Technical Field

[0001] This utility model belongs to the field of optoelectronic precision guidance technology, specifically relating to a high-precision calibration device for a low-precision split-type resistance potentiometer. Background Technology

[0002] In the design of a seeker head, a two-frame stabilization platform structure is typically used to increase the visibility range of the optical system in order to achieve a wider field of view. The stabilization platform structure is driven by a motor, with an angle sensor measuring the deflection angle and a gyroscope measuring the deflection angular velocity. These three data points form a closed-loop circuit for the seeker head. When the drive motor is a three-phase brushless motor, its characteristics require command commutation, with a commutation accuracy typically within 0.05°. The commutation angle information is provided by the angle sensor. Simultaneously, the angle sensor needs to transmit the angle information to the missile's flight control mechanism to complete closed-loop control, thereby achieving precise missile guidance. The accuracy of the angle sensor determines the control difficulty of the seeker head and the guidance accuracy of the missile.

[0003] To meet the accuracy requirements of the seeker head for angle information, high-precision, high-cost angle sensors such as photoelectric encoders and Hall effect sensors are typically used, or integrated resistance potentiometers are employed, calibrated at the factory to achieve high accuracy. However, when facing the miniaturization and low-cost requirements of the seeker head, none of the above angle sensors can meet these requirements. Therefore, a split resistance potentiometer is used for angle measurement. This split potentiometer allows the resistance element and brush head to be mounted separately on the frame and rotating shaft, respectively, reducing assembly space by eliminating the need for metal encapsulation. The low cost of the resistance element further enables low-cost design of the seeker head. However, the accuracy of resistance potentiometers is limited by their operating principle, generally to 0.3% of their range, and their linearity is poor. When the potentiometer's range reaches 30° (generally the minimum range of the seeker), its measurement accuracy is about 0.1°, which is worse than that of photoelectric encoders and Hall sensors. Compared to integrated resistance potentiometers, split-type potentiometers cannot be calibrated at the factory, and during assembly, the flatness of the mounting surface and the inconsistent pressure at the mounting points can amplify the potentiometer's angle error, leading to unstable motor drive, reduced guidance accuracy, and affecting missile hit rate.

[0004] Currently, the lead of a split-type resistance potentiometer requires calibration using a turntable after assembly. If the required accuracy is 0.05°, and assuming a 30° range potentiometer, 30 calibrations are needed at 1° calibration points. Due to poor installation accuracy and linearity, the actual number of calibration points is even greater. This method is time-consuming and labor-intensive, and cannot meet the needs of mass production. Therefore, it is necessary to design a simple and easy-to-install device for calibrating potentiometer accuracy. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The technical problem to be solved by this utility model is to provide a high-precision calibration device for a low-precision split-type resistance potentiometer, so as to solve the problem of low precision of the split-type resistance potentiometer.

[0007] (II) Technical Solution

[0008] To solve the above-mentioned technical problems, this utility model provides a high-precision calibration device for a low-precision split-type resistance potentiometer. The device includes: a tooling frame 1, a photoelectric encoder 2, a potentiometer to be calibrated 3, a stabilizing platform 4, a connecting rod 5, a connecting screw 6, a servo controller 7, a platform clamp 8, a lifting mechanism 101, and an adjustment knob 102.

[0009] The photoelectric encoder 2 is located on the upper end of the upright of the fixture 1. The potentiometer 3 to be calibrated is installed on the stabilizing platform 4. The stabilizing platform 4 is fixed to the base of the fixture 1 by the platform clamp 8. The lifting mechanism 101 is located between the stabilizing platform 4 and the base of the fixture 1. The adjusting knob 102 is located on the lifting mechanism 101. The height of the lifting mechanism 101 is adjusted by adjusting the adjusting knob 102 so that the stabilizing platform 4 is aligned with the photoelectric encoder 2. The two ends of the connecting rod 5 are respectively connected to the rotating shaft of the stabilizing platform 4 and the rotating shaft of the photoelectric encoder 2, so that the rotating shaft of the photoelectric encoder 2 rotates synchronously with the rotating shaft of the stabilizing platform 4. The servo controller 7 is located on the stabilizing platform 4. The power and signal transmission interfaces of the photoelectric encoder 2 and the potentiometer 3 to be calibrated are both connected to the servo controller 7.

[0010] Preferably, the photoelectric encoder 2 is capable of calibrating the potentiometer 3 to be calibrated.

[0011] Preferably, calibration is completed by matching the angle information of the photoelectric encoder 2 with the voltage value information of the potentiometer 3 to be calibrated one by one.

[0012] Preferably, the servo controller 7 is a guide head servo controller 7.

[0013] Preferably, the potentiometer 3 to be calibrated is a resistance potentiometer.

[0014] Preferably, the connecting rod 5 is a detachable structure.

[0015] Preferably, the two ends of the connecting rod 5 are connected to the rotating shaft of the stabilizing platform 4 and the rotating shaft of the photoelectric encoder 2, respectively, and then fixed by connecting screws 6.

[0016] Preferably, the device is used in photoelectric precision guidance.

[0017] This invention also provides a guide head for calibration based on the aforementioned device.

[0018] Preferably, the seeker is used in photoelectric precision guidance.

[0019] (III) Beneficial Effects

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Miniaturized potentiometer design, low cost. This utility model adopts a split potentiometer design without a metal casing, which maximizes the use of structural space and reduces weight; it uses a low-precision, low-cost resistance potentiometer, and achieves the requirement of low cost and high precision by calibrating the low-precision component with a high-precision component after assembly, improving performance while reducing assembly difficulty.

[0022] 2. Simple and versatile structure. This utility model features a simple structure, easy operation, easy installation, and strong practicality. The use of replaceable connecting rods allows it to meet the calibration needs of different stable platforms, making it highly versatile. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the installation of a split-type resistance potentiometer and connecting rod according to this utility model;

[0024] Figure 2 This is a diagram showing the composition of a high-precision calibration device for a split-type potentiometer according to this utility model.

[0025] In the diagram: 1. Tooling frame; 2. Photoelectric encoder; 3. Potentiometer to be calibrated; 4. Stabilizing platform; 5. Connecting rod; 6. Connecting screw; 7. Servo controller; 8. Platform fixture; 101. Lifting mechanism; 102. Adjustment knob. Detailed Implementation

[0026] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0027] like Figure 1 , Figure 2 As shown, this utility model provides a high-precision calibration device for a low-precision split-type resistance potentiometer, which is particularly suitable for the calibration of potentiometers on miniaturized, lightweight, and low-cost guide head stabilization platforms. The device includes: a tooling frame 1, a photoelectric encoder 2, a potentiometer to be calibrated 3, a stabilization platform 4, a connecting rod 5, a connecting screw 6, a guide head servo controller 7, a platform clamp 8, a lifting mechanism 101, and an adjustment knob 102; the potentiometer to be calibrated 3 is a resistance potentiometer; the connecting rod 5 is a detachable structure.

[0028] The photoelectric encoder 2 is located on the upper end of the upright of the fixture 1. The high-precision photoelectric encoder 2 is used to quickly calibrate the potentiometer 3 to be calibrated. The potentiometer 3 to be calibrated is installed on the stabilizing platform 4. The stabilizing platform 4 is fixed to the base of the fixture 1 by the platform clamp 8. The lifting mechanism 101 is located between the stabilizing platform 4 and the base of the fixture 1. The adjusting knob 102 is located on the lifting mechanism 101. The height of the lifting mechanism 101 can be adjusted by adjusting the knob 102, so that the stabilizing platform 4 is aligned with the photoelectric encoder 2. The two ends of the connecting rod 5 are respectively connected to the rotating shaft of the stabilizing platform 4 and the rotating shaft of the photoelectric encoder 2, and are fixed by the connecting screw 6 to ensure that the rotating shaft of the photoelectric encoder 2 rotates synchronously with the rotating shaft of the stabilizing platform 4. The servo controller 7 is located on the stabilizing platform 4. Finally, the power and signal transmission interfaces of the photoelectric encoder 2 and the potentiometer 3 to be calibrated are connected to the servo controller 7 to complete the installation of the calibration device.

[0029] Power on the servo controller 7, manually rotate the stabilizing platform 4 to the mechanical limit, rotate it three times continuously, and through the servo controller 7, match the angle information of the photoelectric encoder 2 with the voltage value information of the potentiometer 3 to be calibrated one by one, thus completing the calibration work.

[0030] This calibration device uses a high-precision photoelectric encoder to calibrate a low-precision potentiometer. After calibration, the low-precision resistance potentiometer can achieve the angular measurement accuracy of a high-precision photoelectric encoder. Since the calibration device can be used to calibrate the entire unit without the ball cover or with the stabilized platform fully assembled, it significantly expands the applicability of the split-type resistance potentiometer. It eliminates the need for high-precision assembly, thus reducing assembly difficulty. Furthermore, since the price of a split-type resistance potentiometer is typically one-sixth that of a Hall sensor and one-tenth that of a photoelectric encoder, it significantly reduces operating costs. Simultaneously, its split design without a metal casing results in a small footprint and light weight, solving the problems of miniaturization, weight reduction, and low cost for stabilized platform potentiometers in small-diameter seekers.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-precision calibration device for a low-precision split-type resistance potentiometer, characterized in that, The device includes: a tooling frame (1), a photoelectric encoder (2), a potentiometer to be calibrated (3), a stabilizing platform (4), a connecting rod (5), a connecting screw (6), a servo controller (7), a platform clamp (8), a lifting mechanism (101), and an adjustment knob (102). The photoelectric encoder (2) is located on the upper end of the upright of the tooling frame (1). The potentiometer (3) to be calibrated is installed on the stabilizing platform (4). The stabilizing platform (4) is fixed on the base of the tooling frame (1) by the platform clamp (8). The lifting mechanism (101) is located between the stabilizing platform (4) and the base of the tooling frame (1). The adjusting knob (102) is located on the lifting mechanism (101). The height of the lifting mechanism (101) is adjusted by adjusting the adjusting knob (102) so that the stabilizing platform (4) is aligned with the photoelectric encoder (2). The two ends of the connecting rod (5) are respectively connected to the rotating shaft of the stabilizing platform (4) and the rotating shaft of the photoelectric encoder (2) so that the rotating shaft of the photoelectric encoder (2) rotates synchronously with the rotating shaft of the stabilizing platform (4). The servo controller (7) is located on the stabilizing platform (4). The power and signal transmission interfaces of the photoelectric encoder (2) and the potentiometer (3) to be calibrated are both connected to the servo controller (7).

2. The apparatus as claimed in claim 1, characterized in that, The photoelectric encoder (2) can calibrate the potentiometer (3) to be calibrated.

3. The apparatus as described in claim 1, characterized in that, The calibration is completed by matching the angle information of the photoelectric encoder (2) with the voltage value information of the potentiometer (3) to be calibrated one by one.

4. The apparatus as claimed in claim 1, characterized in that, The servo controller (7) is a guide head servo controller (7).

5. The apparatus as claimed in claim 1, characterized in that, The potentiometer to be calibrated (3) is a resistance potentiometer.

6. The apparatus as claimed in claim 1, characterized in that, The connecting rod (5) is a detachable structure.

7. The apparatus as claimed in claim 1, characterized in that, The two ends of the connecting rod (5) are respectively connected to the rotating shaft of the stabilizing platform (4) and the rotating shaft of the photoelectric encoder (2), and then fixed by connecting screws (6).

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