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Audio-video equipment impact test device

An impact test, audio and video technology, applied in the direction of measuring device, impact test, machine/structural component test, etc., can solve the problems of large vibration and noise, eccentricity of guide sleeve and guide rod, low guide precision, etc., and achieve reduction Effects of vibration and noise, high guiding accuracy, and reduced maintenance costs

Inactive Publication Date: 2019-11-22
四会市圆成机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention mainly solves the deficiencies in the impact test device of audio and video equipment, the guide sleeve and the guide rod are prone to eccentricity, the guide precision is low, and the vibration and noise are relatively large, so as to develop a sound system for automatically centering the guide rod in the guide sleeve. Impact test device for video equipment

Method used

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  • Audio-video equipment impact test device
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  • Audio-video equipment impact test device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 , figure 2 Shown, guide rod 5 is housed in guide sleeve 2. Support 6 is installed in guide sleeve 2, present embodiment adopts upper and lower layers, and electromagnet 7 is housed on support 6. figure 2 The solenoid shown is U-shaped. Since the inductance of the coil is a function of the displacement of the guide rod, the voltage across it is also a function of the displacement of the guide rod.

[0028] Such as image 3 As shown, the circuit is composed of a bandpass circuit 1a, a primary amplifier circuit 2a, a differential detection circuit 3a, a demodulation circuit 4a, and a low-pass filter circuit 5a. At the input end of the linear power amplifier of the magnet coil, a high-frequency signal is injected as a test signal for the position of the guide rod. In addition to the DC component acting on the resistor, the voltage at both ends also has the AC component of the high-frequency signal acting on the inductor. The band-pass circuit 1a is u...

Embodiment 2

[0031] Figure 4 It is the schematic diagram of the self-detection system for the eccentricity of the guide rod. The circuit is composed of bias circuit, detection circuit, and control circuit.

[0032] The signal generated by the pulse width modulation signal (PWM) generator 9a is input to the bias circuit 10a, and a bias magnetic field is generated in the electromagnet. Since the inductance of the electromagnet is a function of the displacement of the guide rod, the carrier voltage (or current) component of the PWM extracted from the control electromagnet contains the displacement information of the guide rod. Because of the control current, in addition to the PWM carrier component of the bias coil mutual induction in the control voltage (current), there is also the voltage (including self-induction voltage) generated by the control current on the control solenoid coil. Therefore, the output voltage on the control electromagnet coil must pass through the resonant circuit 1...

Embodiment 3

[0035] In this embodiment, the guide sleeve is equipped with a sensor, and the sensor is used to detect the displacement of the guide rod relative to the guide sleeve, so as to realize the automatic centering of the guide rod in the guide sleeve.

[0036] Figure 5 It is the schematic diagram of the self-detection system for the eccentricity of the guide rod. The circuit is composed of a sensor 14a, a controller 6a-3, a power amplifier 1 8a-3, a power amplifier 2 8a-4, and a displacement conversion circuit 13a.

[0037] When the guide rod is eccentric, the sensor 14a detects that the displacement signal is converted by the displacement conversion circuit 13a, and then converted into a control current by the controller 6a-3 and the power amplifier 8a-3, and the electromagnetic force of the electromagnet is adjusted to make the guide sleeve and the guide rod Automatically centered.

[0038] If both the permanent magnet and the electromagnet are used in the above embodiment, th...

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PUM

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Abstract

An audio and video equipment impact test device comprises an upper flat plate, guide rods, guide sleeves, a driving cam mechanism, a lower flat plate, a speed reducer and a motor. Four guide rods arefixed on the lower plane of the upper flat plate, and the four guide rods are symmetrically arranged; four guide sleeves are fixed to the lower plane of the lower flat plate and connected with the four guide rods of the upper flat plate in a matched mode. Magnets are arranged on the guide rods or the guide sleeves; a magnet coil is connected with a guide rod eccentricity control circuit, and the eccentricity control circuit comprises a displacement detection circuit, a controller connected with the displacement detection circuit converts a displacement signal into a control signal, and the control signal is amplified by the power amplifier and then drives the magnet, thereby achieving the automatic centering of the guide rods in the guide sleeves. The invention has the beneficial effects that the structure is simple, the guide precision is high, the vibration and noise are reduced, the abrasion of the guide rods and the guide sleeves is reduced, and the maintenance cost is reduced.

Description

technical field [0001] The invention relates to an impact test device for audio and video equipment, in particular to an impact test device for audio and video equipment in which a guide rod is centered in a guide sleeve through magnetic suspension. Background technique [0002] The friction pair between the guide rod and the guide sleeve of the existing audio and video equipment impact test device is a direct contact type, and there is a gap between the guide sleeve and the guide rod. During the movement, the guide sleeve and the guide rod are prone to eccentricity, and the guide The accuracy is low, and the vibration and noise are large. Contents of the invention [0003] The invention mainly solves the deficiencies in the impact test device of audio and video equipment that the guide sleeve and the guide rod are prone to eccentricity, the guide precision is low, and the vibration and noise are relatively large, so as to develop a sound system that automatically centers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/08G05D3/12
CPCG01M7/08G05D3/12
Inventor 杨灏
Owner 四会市圆成机械科技有限公司