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Syringe pump

A technology for a syringe pump and a syringe, applied in the field of syringe pumps, can solve the problems of eccentricity between the hole wall of the guide hole and the guide rod, large vibration and noise, and low guide accuracy, so as to reduce maintenance costs, reduce vibration and noise, and reduce guide accuracy. high effect

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 disadvantages of the injection pump that the wall of the guide hole 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 syringe pump in which the guide rod is automatically centered in the wall of the guide hole

Method used

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  • Syringe pump
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 , figure 2 Shown, guide rod 5 is housed in guide hole wall 2. Support 6 is installed in guide hole hole wall 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.

[0024] 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 circ...

Embodiment 2

[0027] 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.

[0028] 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

[0031] In this embodiment, a sensor is installed on the wall of the guide hole, and the sensor is used to detect the displacement of the guide rod relative to the wall of the guide hole, so as to realize the automatic centering of the guide rod in the wall of the guide hole.

[0032] 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.

[0033] 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 hole wall and Guide rods are automatically centered.

[0034] If both the permanent magnet and the electromagnet are...

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Abstract

The invention provides a syringe pump. The syringe pump comprises a base seat, a motor, a syringe tube pressing block and three X-direction parallel guide rods installed on the base seat, a lead screwdriven by the motor, and a syringe handle assembly mechanism having three guide holes, a syringe handle limit groove and a drive hole; each guide rod cooperates with one corresponding guide hole to form a sliding pair; each guide rod or the wall of each guide hole is provided with magnets; the coil of each magnet is connected with a guide rod eccentricity control circuit; and the eccentricity control circuit comprises a displacement detection circuit, a controller connected to the displacement detection circuit converts the displacement signal into a control signal, the control signal is amplified by a power amplifier to drive the magnets, so that automatic centering of each guide rod in the wall of one corresponding guide hole is realized. The syringe pump provided by the invention has the beneficial effects of having a simple structure and high guiding accuracy, reducing vibration and noise, reducing abrasion of each guide rod and the wall of one corresponding guide hole, and reducing maintenance costs.

Description

technical field [0001] The invention relates to a syringe pump, in particular to a syringe pump in which a guide rod is centered in a guide hole wall through magnetic levitation. Background technique [0002] The friction pair between the guide rod and the guide hole wall of the existing injection pump is a direct contact type. There is a gap between the guide hole wall and the guide rod. During the movement, the guide hole wall and the guide rod are prone to eccentricity. , low guiding precision, high vibration and noise. Contents of the invention [0003] The invention mainly solves the problems in the injection pump that the wall of the guide hole and the guide rod are prone to eccentricity, the guide precision is low, and the vibration and noise are large, so as to develop a syringe pump in which the guide rod is automatically centered in the wall of the guide hole. [0004] The above-mentioned technical problems of the present invention are mainly solved by the follo...

Claims

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Application Information

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IPC IPC(8): A61M5/142
CPCA61M5/142A61M2005/14208A61M2205/3317
Inventor 杨灏
Owner 四会市圆成机械科技有限公司