High-precision injection pump

Abstract

The utility model discloses a high-precision injection pump, relates to the technical field of liquid injection pumps, and solves the problems that an existing injection pump is low in precision and easily causes non-uniform coating thickness. A switching valve is connected to the machine body, one end of the switching valve is connected to the liquid inlet pipe and the liquid outlet pipe, the other end of the switching valve is connected to the sample injector, and liquid is controlled to enter the sample injector from the liquid inlet pipe or enter the liquid outlet pipe from the sample injector; the machine body is further connected with a grating ruler, a linear motor stator and a linear motor rotor, the linear motor stator drives the linear motor rotor to do reciprocating linear movement, the grating ruler detects the displacement of the linear motor rotor, and the linear motor rotor is connected with the piston end of the sample injector and drives the sample injector to do telescopic movement. A linear motor is adopted to push a sample injector for injection, a rotor of the linear motor is not in contact with a stator, and a magnetic field generated by a coil interacts with a magnetic field on a rotor guide rail to generate linear motion; and a high-precision grating ruler is matched, so that the stable speed during movement can be ensured, and the effect of ensuring the coating quality is achieved.

Description

Technical Field

[0001] This utility model relates to the field of injection pump technology, and in particular to a high-precision injection pump. Background Technology

[0002] Injection pumps are widely used in the precision metering and filling of micro-volume liquids, as well as in the medical and health, food, chemical, bio-industry, pharmaceutical, and other fields requiring high-precision liquid control. With technological advancements and rapid industrial development, the demand for precise liquid control is increasing, driving the continuous development and improvement of high-precision injection pump technology. From initial manual control to today's automated and intelligent control, high-precision injection pumps have undergone a development process from simple to complex, and from basic to advanced.

[0003] However, the precision of injection pumps currently on the market is relatively low. For example, they use motors and lead screws to achieve the injection function, and their precision depends more on the precision of the lead screw. In high-precision coating operations, lead screw lead error can lead to problems such as uneven coating thickness. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision injection pump that uses a linear motor to drive the injector for injection. The linear motor's mover and stator do not contact each other. The magnetic field generated by the coil interacts with the magnetic field on the mover's guide rail to produce linear motion. When paired with a high-precision grating ruler, it can ensure stable speed during movement, improve its running accuracy, and guarantee the quality of the coating.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A high-precision injection pump includes a body with a switching valve connected to it. One end of the switching valve is connected to an inlet pipe and an outlet pipe, and the other end is connected to a syringe injector, controlling whether liquid enters the syringe injector from the inlet pipe or enters the outlet pipe from the syringe injector. The body is also connected to a grating ruler, a linear motor stator, and a linear electronic actuator. The linear motor stator drives the linear motor actuator to move back and forth linearly. The grating ruler detects the displacement of the linear motor actuator. The linear motor actuator is connected to the piston end of the syringe injector, causing it to move telescopically.

[0007] By adopting the above technical solution, the switching valve controls the liquid to enter the sampler from the inlet pipe or from the sampler to the outlet pipe. The linear motor stator drives the linear motor mover to move back and forth in a linear motion. The linear motor mover drives the piston end of the sampler to extend and retract. The magnetic field generated by the coil interacts with the magnetic field on the mover guide rail to produce linear motion. With the high-precision grating ruler, the speed can be kept stable during movement, the sampling accuracy of the sampler can be improved, and the coating quality can be guaranteed.

[0008] Furthermore, the grating ruler includes a grating ruler reading head and a grating ruler body, which are respectively connected to the machine body and the linear motor actuator.

[0009] By adopting the above technical solution, the displacement accuracy of the linear motor mover relative to the machine body is improved by detecting the displacement of the linear motor mover through the grating ruler reading head and the grating ruler body.

[0010] Furthermore, the grating ruler reading head is connected to the inside of the linear motor mover, and the grating ruler body is fixed to the machine body.

[0011] By adopting the above technical solution, the load on the linear motor actuator is reduced, and its displacement accuracy is improved.

[0012] Furthermore, the switching valve includes a switching motor connected to the machine body, which drives the switching valve to switch between connecting the sampler and the inlet pipe or switching it to connect with the outlet pipe.

[0013] By adopting the above technical solution, the switching valve can be automatically switched to control the liquid to enter the injector from the inlet pipe or enter the outlet pipe from the injector.

[0014] Furthermore, the inlet tube is a flexible tube with its outer end extending into the test tube.

[0015] By adopting the above technical solution, liquid injection is facilitated.

[0016] Furthermore, the outlet tube is a flexible tube.

[0017] By adopting the above technical solution, liquid discharge is facilitated.

[0018] Furthermore, the machine body is connected to a mover guide rail, and the linear motor mover slides along the mover guide rail.

[0019] By adopting the above technical solution, the sliding motion of the linear motor mover is guided, thereby improving its movement accuracy.

[0020] Furthermore, the machine body is connected to two pulleys, and a synchronous belt is fitted over the two pulleys. A connecting block is connected to the linear motor actuator, and the connecting block is connected to the synchronous belt.

[0021] By adopting the above technical solution, the stability of the linear motor's moving part is further improved, and the sampling accuracy is enhanced.

[0022] Furthermore, a drive block is fixed to the outer end of the piston of the injector, and the drive block is connected to the linear motor actuator by several screws.

[0023] By adopting the above technical solution, it is convenient to connect the injector with the linear motor actuator, and to facilitate the driving of the injector.

[0024] In summary, this utility model has the following beneficial effects:

[0025] The switching valve automatically switches via a switching motor to control the liquid flow from the inlet pipe into the injector or from the injector into the outlet pipe. The linear motor stator drives the linear motor mover to reciprocate linearly, which in turn drives the piston end of the injector to extend and retract. The magnetic field generated by the coil interacts with the magnetic field on the mover guide rail to produce linear motion. A high-precision grating ruler is used to detect the displacement of the linear motor mover relative to the machine body through the grating ruler reading head and the grating ruler body, thereby improving the displacement accuracy of the linear motor mover.

[0026] One side of the linear motor mover slides along the mover guide rail, while the other side is connected to the synchronous belt through a connecting block. By guiding the sliding of the linear motor mover, its movement accuracy and stability are further improved, thereby improving the sampling accuracy.

[0027] This application ensures stable movement speed during liquid dispensing, improves the sampling accuracy of the sampler, and guarantees the liquid supply accuracy of the syringe pump and the final coating quality. Attached Figure Description

[0028] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the high-precision injection pump of this utility model;

[0030] Figure 2 This is a structural schematic diagram of the high-precision injection pump of this utility model from another perspective.

[0031] In the diagram, 1 is the test tube; 2 is the inlet tube; 3 is the outlet tube; 4 is the switching valve; 5 is the linear motor mover; 6 is the grating ruler reading head; 7 is the grating ruler body; 8 is the linear motor stator; 9 is the sampler; and 10 is the switching motor. Detailed Implementation

[0032] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on this utility model. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0033] A high-precision injection pump, such as Figure 1 and Figure 2As shown, it includes a body, on which a switching valve 4 is connected. One end of the switching valve 4 is connected to the inlet pipe 2 and the outlet pipe 3, and the other end is connected to the sampler 9, controlling the liquid to enter the sampler 9 from the inlet pipe 2 or from the sampler 9 into the outlet pipe 3.

[0034] The switching valve 4 includes a switching motor 10, which is connected to the machine body and drives the switching valve 4 to switch, connecting the injector 9 to the inlet pipe 2 or switching it to connect to the outlet pipe 3, so as to realize the automatic switching of the switching valve 4 to control the liquid to enter the injector 9 from the inlet pipe 2 or enter the outlet pipe 3 from the injector 9.

[0035] Both the inlet pipe 2 and the outlet pipe 3 are flexible tubes. The outer end of the inlet pipe 2 extends into the test tube 1 to facilitate liquid inlet and outlet.

[0036] like Figure 1 As shown, the machine body is also connected to a grating ruler, a linear motor stator 8 and a linear electronic actuator. The linear motor stator 8 drives the linear motor actuator 5 to move back and forth in a linear motion. The grating ruler detects the displacement of the linear motor actuator 5. The linear motor actuator 5 is connected to the piston end of the sampler 9 and drives it to move in a telescopic manner.

[0037] Specifically, the grating ruler includes a grating ruler reading head 6 and a grating ruler body 7, which are respectively connected to the machine body and the linear motor mover 5. The displacement of the linear motor mover 5 relative to the machine body is detected by the grating ruler reading head 6 and the grating ruler body 7, thereby improving the displacement accuracy of the linear motor mover 5. In this embodiment, the grating ruler reading head 6 is connected to the inside of the linear motor mover 5, and the grating ruler body 7 is fixed to the machine body to reduce the load on the linear motor mover 5.

[0038] The linear motor stator 8 drives the linear motor mover 5 to reciprocate linearly. The linear motor mover 5 drives the piston end of the sampler 9 to extend and retract. The magnetic field generated by the coil interacts with the magnetic field on the mover guide rail to produce linear motion. With the high-precision grating ruler, the speed can be kept stable during movement, improve the sampling accuracy of the sampler, and ensure the quality of the coating.

[0039] like Figure 1 As shown, the machine body is connected to a mover guide rail and two pulleys. The two pulleys are fitted with a synchronous belt. The mover guide rail and the synchronous belt are located on both sides of the linear motor mover 5. One side of the linear motor mover 5 slides along the mover guide rail, and the other side is connected to a connecting block. The connecting block is connected to the synchronous belt to guide the sliding of the linear motor mover 5 at both sides, thereby improving its movement accuracy and stability.

[0040] like Figure 1 As shown, the piston end of the injector 9 is fixed to the drive block by screws or other means. The drive block is connected to the linear motor mover 5 by several screws, which facilitates the connection between the injector 9 and the linear motor mover 5.

[0041] Action flow:

[0042] 1. The switching motor 10 rotates 90 degrees, causing the switching valve 4 to block the liquid outlet pipe 3, thereby connecting the liquid inlet pipe 2 with the sampler 9;

[0043] 2. The linear motor mover 5 drives the piston end of the injector 9 to descend, drawing liquid from the test tube 1 into the injector 9;

[0044] 3. When the switching motor 10 rotates 180 degrees, the switching valve 4 is switched to block the inlet pipe 2, so that the outlet pipe 3 can be connected to the sampler 9;

[0045] 4. The linear motor mover 5 drives the piston end of the injector 9 to rise, discharging the liquid from the liquid outlet tube 3 in the injector 9.

[0046] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A high-precision injection pump, characterized in that: The device includes a body on which a switching valve (4) is connected. One end of the switching valve (4) is connected to the inlet pipe (2) and the outlet pipe (3), and the other end is connected to the injector (9). The valve controls the liquid to enter the injector (9) from the inlet pipe (2) or from the injector (9) to the outlet pipe (3). The device also includes a grating ruler, a linear motor stator (8), and a linear electronic mover. The linear motor stator (8) drives the linear motor mover (5) to move back and forth in a linear motion. The grating ruler detects the displacement of the linear motor mover (5). The linear motor mover (5) is connected to the piston end of the injector (9) and drives it to move in a telescopic manner.

2. The high-precision injection pump according to claim 1, characterized in that: The grating ruler includes a grating ruler reading head (6) and a grating ruler body (7), which are respectively connected to the machine body and the linear motor mover (5).

3. The high-precision injection pump according to claim 2, characterized in that: The grating ruler reading head (6) is connected to the inside of the linear motor mover (5), and the grating ruler body (7) is fixed to the machine body.

4. The high-precision injection pump according to claim 1, characterized in that: The switching valve (4) includes a switching motor (10), which is connected to the machine body and drives the switching valve (4) to switch, connecting the injector (9) and the liquid inlet pipe (2) or switching to connect with the liquid outlet pipe (3).

5. The high-precision injection pump according to claim 1, characterized in that: The inlet tube (2) is a flexible tube with its outer end extending into the test tube (1).

6. The high-precision injection pump according to claim 1 or 5, characterized in that: The outlet pipe (3) is a flexible tube.

7. The high-precision injection pump according to claim 1, characterized in that: The machine body is connected to a mover guide rail, and the linear motor mover (5) slides along the mover guide rail.

8. The high-precision injection pump according to claim 1 or 7, characterized in that: The machine body is connected to two pulleys, and a synchronous belt is provided on the outer sleeve of the two pulleys. A connecting block is connected to the linear motor mover (5), and the connecting block is connected to the synchronous belt.

9. The high-precision injection pump according to claim 1, characterized in that: The piston end of the injector (9) is fixed with a drive block, which is connected to the linear motor mover (5) by several screws.

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