CN205103269U - Continuous injector - Google Patents

Abstract

The utility model discloses a continuous sample injector. It includes a bracket, a syringe and a stepping motor. A screw is connected to the output shaft of the stepping motor. A nut is installed on the screw. Two hollow tubes are installed on the nut. The hollow tube is connected with the piston rod of the syringe. The feed motor is connected with a driver; the top of the syringe is equipped with a three-way valve, and the bracket is also fixed with a steering gear. Both the steering gear and the driver are connected with the processor, and the processor is also connected with a keyboard and a display unit. After adopting the above structure, the required sample volume information can be input through the keyboard, processed by the processor, and the stepper motor is driven by the driver, and at the same time, the three-way valve is controlled by the steering gear to cooperate with the stepper motor for sample injection and sample release. , and then display the running status through the display unit to monitor the work of the injector. Its structure design is simple and reasonable, the manufacturing cost is low, and the automatic control greatly improves the sampling efficiency and sampling accuracy.

Description

continuous sampler

technical field

The utility model relates to a sample injector, in particular to a continuous sample injector.

Background technique

In the process of sample inspection and analysis, it usually needs to be completed by a sample injector. The existing sample injection is generally performed manually. Due to the different proficiency of individual operations, the inspection efficiency is relatively low and the reliability of the operation is relatively poor. The accuracy of the final inspection is relatively low. Although an autosampler has appeared on the market that can automatically inject samples, its structure is complex, it takes up a lot of space, and its cost is high, making it difficult to popularize and use.

Contents of the invention

The technical problem to be solved by the utility model is to provide a continuous sample injector with simple structure, low cost, high sampling efficiency and high sampling precision.

In order to solve the above-mentioned technical problems, the continuous sample injector of the present utility model includes a bracket, a syringe fixed on the bracket and a stepping motor fixedly installed on the bottom of the bracket, the output shaft of the stepping motor is connected with a screw rod, and the A nut that can reciprocate on the lead screw is installed on the rod, and two hollow tubes are installed on the nut. The hollow tube is connected with the piston rod of the syringe and can push the piston rod to move back and forth in a straight line. The driver of the motor action; a three-way valve is installed on the top of the syringe, and a steering gear that can control the rotation of the three-way valve is fixedly installed on the bracket. Both the steering gear and the driver are connected to a processor that can issue information instructions, and the processor is also connected to a A keyboard for inputting information into the processor and a display unit for displaying data information.

The processor is a single-chip microcomputer.

The bracket is also provided with an upper limit switch and a lower limit switch capable of limiting the movement of the piston rod.

The display unit is a liquid crystal display.

After adopting the above structure, the required sample volume information can be input through the keyboard, processed by the processor, and the stepper motor is driven by the driver, and at the same time, the three-way valve is controlled by the steering gear to cooperate with the stepper motor for sample injection and sample release. , and then display the running status through the display unit to monitor the work of the injector. If the program runs away or the operator makes a mistake and the stepping motor exceeds the stroke, the limit switch will be touched to protect the system from power failure. Its structural design is simple and reasonable. , the manufacturing cost is low, and the automatic control greatly improves the sampling efficiency and sampling precision.

Description of drawings

Fig. 1 is the structural representation of the continuous sample injector of the present utility model.

detailed description

The continuous sample injector of the present utility model will be described in further detail below in combination with the accompanying drawings and specific embodiments.

As shown in the figure, the continuous sample injector of the present utility model includes a bracket 1, a syringe 2 fixedly installed on the bracket and a stepping motor 3 fixedly installed at the bottom of the bracket 1, the output shaft of the stepping motor 3 is connected with a Screw rod 4, on which a nut 5 capable of reciprocating movement on the screw rod is installed, and a door-shaped guide rod is also fixedly installed on the stepping motor 3, so that the nut is constrained by the door-shaped guide rod to move the nut in the axial direction , two hollow tubes 6 are installed on the nut 5, the hollow tubes 6 are connected with the piston rod 7 of the syringe 2 and can push the piston rod 7 to move back and forth in a straight line, the stepper motor 3 is connected with a driver that can drive the stepper motor action; the syringe 2 A three-way valve 9 is installed on the top of the bracket 1, and a steering gear that can control the rotation of the three-way valve is fixedly installed on the bracket 1. Both the steering gear and the driver are connected to a processor that can send information instructions, and the processor is also connected to a processor that can send information to the processor. A keyboard for inputting information and a display unit capable of displaying data information.

Further, the said processor is a single-chip microcomputer, and the single-chip microcomputer, the driver and the steering gear are powered by a lithium battery, and a voltage stabilizing circuit is arranged between the single-chip microcomputer, the driver, the steering gear and the lithium battery, and the said display unit is a 12864 liquid crystal display , The upper limit switch 8 and the lower limit switch 10 which can limit the action of the piston rod are also arranged on the bracket.

Its working process is as follows: first input the required sample volume through the control keyboard, and after receiving the instruction, the microcontroller will send corresponding signals and control instructions to the driver, steering gear and 12864 LCD respectively; the driver controls the stepping motor after receiving the pulse signal Work in a certain direction and steps; the steering gear controls the rotation of the three-way valve after receiving the pulse signal, and cooperates with the stepping motor for sample injection and sample release; when injecting samples, the steering gear controls the three-way valve to open the injection port, The sample release port is closed; when the sample is released, the sample release port is opened and the sample inlet is closed; this overcomes the shortcoming of the traditional three-dimensional design of the injector taking up a large space and realizes the miniaturization of the injector. Secondly, due to the continuous work of sample injection and sample release, the efficiency of sample injection is greatly improved. Finally, the one-dimensional design is adopted instead of the traditional three-dimensional design for sample injection, which saves the number of motors, simplifies the mechanical design, and reduces the design cost. At the same time, during the working process, the 12864 LCD will display the operation of the system in real time after receiving the control command status, to monitor the work of the injector; secondly, if the program runs away or the operator makes a mistake and the stepper motor exceeds the stroke, the limit switch will be touched to protect the system from power failure.

Claims (4)

1. A continuous sample injector, characterized in that: it includes a bracket (1), a syringe (2) fixedly installed on the bracket and a stepping motor (3) fixedly installed at the bottom of the bracket (1), the stepper A screw (4) is connected to the output shaft of the motor (3), and a nut (5) capable of reciprocating movement on the screw is installed on the screw (4), and a nut (5) is installed on the screw Two hollow tubes (6), the hollow tubes (6) are connected with the piston rod (7) of the syringe (2) and can push the piston rod (7) to move back and forth in a straight line, and the stepping motor (3) is connected with a A driver that drives the action of the stepping motor; a three-way valve (9) is installed on the top of the syringe (2), and a steering gear that can control the rotation of the three-way valve is also fixedly installed on the bracket (1). A processor capable of issuing information instructions is connected, and the processor is also connected with a keyboard capable of inputting information into the processor and a display unit capable of displaying data information. 2. The continuous sampler according to claim 1, characterized in that: the processor is a single-chip microcomputer. 3. The continuous sample injector according to claim 1, characterized in that: an upper limit switch (8) and a lower limit switch (10) capable of limiting the movement of the piston rod are also arranged on the support. 4. The continuous sampler according to claim 1, wherein the display unit is a liquid crystal display.