Multi-channel injection pump and use method thereof

Abstract

The invention discloses a multi-channel injection pump and a using method thereof, and aims to overcome the defect that an existing injection pump is single in function. The device comprises a flow path switching module, a control module and a liquid pumping and injecting module, the flow path switching module comprises a valve body and a switching diaphragm, the control module comprises a controller and a flow detection structure, and the liquid pumping and injecting module comprises a piston driven by a lead screw sliding block pair; the valve body is provided with a main flow channel and a plurality of liquid changing holes, the switching diaphragm can rotate relative to the valve body, the main flow channel is provided with a main flow channel opening in the center of the valve body, the distances between the liquid changing holes and the main flow channel opening are the same, the liquid changing holes are formed at equal intervals, and the switching diaphragm is provided with a flow channel groove. The runner groove is communicated with the liquid changing hole and the main runner opening; the piston is communicated with the other main runner opening of the main runner; the multi-channel liquid changing hole is matched with the automatic switching liquid changing hole, and the piston is controlled to realize high-precision automation and multi-channel, high-frequency and high-precision liquid transfer.

Description

Technical Field

[0001] The present invention relates to an infusion pump, and more particularly to a multi-channel injection pump and a method for using the same. Background Art

[0002] As a precision liquid delivery device, syringe pumps are widely used in medical, laboratory and industrial fields, especially in high-precision liquid delivery, drug injection and chemical reagent delivery.

[0003] Existing injection pumps use pistons to transfer liquids. Some injection pumps use built-in liquid storage containers to supply liquids and discharge liquids quantitatively through the liquid outlet, while others use a single opening for liquid inlet and outlet. For scenarios that require precise injection of liquids into several containers and multiple positioning, the above-mentioned injection pumps are difficult to meet the needs. A more intelligent multi-channel injection pump is urgently needed.

[0004] Chinese patent CN210343631U, named as a precision screw injection pump, discloses a precision screw injection pump, including an injection pump body, a motor mounting groove, a motor, a piston sleeve, a piston, a screw hole, a screw, a spherical bearing, a liquid storage chamber, a liquid storage tank, a liquid guide tube, a liquid outlet, a plunger, a mounting plate, a connecting bolt and a slot-type switch. A motor mounting groove is provided on the inner wall of one side of the injection pump body, a motor is fixedly installed inside the motor mounting groove, a piston sleeve is inlaid and installed on the inner wall of the injection pump body on one side of the motor, and a piston is fixedly connected to the inner sleeve of the piston sleeve.

[0005] The syringe pump represented by the above-mentioned injection pump cannot perform multi-channel injection. Summary of the invention

[0006] The present invention overcomes the shortcomings of existing injection pumps and provides a multi-channel injection pump and a method for using the same, which can supply liquid to multiple containers with high precision and meet high-frequency multi-container injection scenarios.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A multi-channel injection pump comprises a flow path switching module, a control module and a liquid extraction module, wherein the flow path switching module comprises a valve body and a switching diaphragm, the control module comprises a controller and a flow detection structure, and the liquid extraction module comprises a piston driven by a lead screw slider pair; The valve body is provided with a main flow channel and a plurality of liquid exchange holes, the switching diaphragm can rotate relative to the valve body, the main flow channel is provided with a main flow channel opening at the center of the valve body, the distances from the liquid exchange holes to the main flow channel opening are the same and the liquid exchange holes are arranged at equal intervals, the switching diaphragm is provided with a flow channel groove, when the switching diaphragm is fitted with the valve body and the flow channel groove is fitted with a liquid exchange hole, the flow channel groove connects the liquid exchange hole and the main flow channel opening; The piston is connected to another main flow channel opening of the main flow channel; The flow detection structure includes a fixed part and a movable part. The movable part moves away from or close to the fixed part as the piston rod moves. The flow detection structure generates a position signal according to the position of the movable part and determines the liquid volume of the piston.

[0008] The syringe pump generates negative pressure through the suction of the piston, sucking the liquid into the piston, and then generates positive pressure through the reset of the piston to pump the liquid out. The piston port is connected to the valve body, and the liquid outlet of the valve body is used to connect to the external container. The valve body switches the liquid exchange hole connected to the main channel by switching the diaphragm, thereby realizing the function of switching the container connected to the piston.

[0009] The switching diaphragm blocks the inner end face of the valve body, and the various liquid exchange holes on the valve body are through holes that pass through the two end faces. The switching diaphragm blocks the liquid exchange holes on the valve body, thereby cutting off the connection between the liquid exchange holes and the interior. Due to the flow channel groove on the switching diaphragm, when the flow channel groove rotates to connect with a liquid exchange hole, the liquid exchange hole is connected with the main flow channel. The main flow channel is connected to the piston through the main flow channel, thereby realizing the connection between the liquid exchange hole and the piston. Thus, by rotating the switching diaphragm, the effect of connecting different liquid exchange holes with the valve body is achieved. When in use, the liquid in the container corresponding to the No. 1 liquid exchange hole can be drawn in through the valve body connected to the No. 1 liquid exchange hole. When the switching diaphragm is switched to the No. 2 liquid exchange hole, the valve body pumps out the liquid again, thereby sending it into the container corresponding to the No. 2 liquid exchange hole, thereby realizing the transfer of liquid.

[0010] For multiple liquid exchange holes, the diaphragm can be switched to different liquid exchange holes by rotating, so as to realize the extraction and supply of liquid to the containers corresponding to the multiple liquid exchange holes. In order to ensure accuracy, the flow detection structure is used to judge the amount of liquid in the piston according to the displacement of the piston.

[0011] Preferably, the flow path switching module further comprises a flow path switching motor and a rotating bracket, the output shaft of the flow path switching motor is drivingly connected to the rotating bracket and drives the rotating bracket to rotate, the side wall of the rotating bracket is provided with a protrusion, the side wall of the switching diaphragm is provided with a groove, and the protrusion is engaged with the groove. The switching of the switching diaphragm is achieved by the flow path switching motor cooperating with the rotating bracket, and the switching diaphragm rotates with the output shaft of the flow path switching motor by engaging the protrusion on the rotating bracket with the groove of the switching diaphragm.

[0012] Preferably, the swivel bracket further includes a set screw, a push rod, a disc spring and a gasket, the set screw is threadedly connected to the swivel bracket, the gasket and the switching diaphragm fit together, the disc spring abuts between the push rod and the gasket, the set screw abuts against the push rod, and the set screw is threadedly connected to the swivel bracket to adjust the extension amount to adjust the pressure applied by the gasket to the switching diaphragm. The structure is used to ensure that the switching diaphragm fits the valve body to avoid leakage. The set screw adjusts the extension amount through the threaded connection, and a certain pre-tightening force between the gasket and the valve body is ensured by applying pressure to the disc spring.

[0013] Preferably, the flow path switching module further includes an angle control structure, which includes an encoder disc coaxially connected to the output shaft of the flow path switching motor and a signal receiver matched with the encoder disc, the signal receiver generates a phase angle signal according to the rotation angle of the encoder disc, and the signal receiver is communicatively connected to the controller. The encoder is used to determine the current phase angle of the switching diaphragm.

[0014] Preferably, the piston includes a piston cylinder, a piston body, a piston rod and a heating structure, the heating structure is offset from the piston cylinder, the heating structure includes a self-controlling temperature heating plate surrounding the piston cylinder, the heating structure is communicatively connected to a controller, and a temperature sensor is provided on the controller. The self-controlling temperature heating plate is used to heat the liquid, and since the piston body is made of PTFE (polytetrafluoroethylene), shrinkage at low temperatures may lead to reduced sealing, and shrinkage of the piston body is avoided by heating.

[0015] Preferably, the screw slider pair includes a screw and a screw nut, the screw nut is fixedly connected with a lock pin, the screw is transmission-connected to a screw motor, the screw motor drives the screw to rotate, and the lock pin is fixedly connected to the piston rod. The structure realizes the screw slider pair driving the piston.

[0016] Preferably, the screw rod is inserted into the upper bearing block and the lower bearing block, the screw rod and the upper bearing block and the lower bearing block are rotatably connected, and the controller is installed on the upper bearing block and the lower bearing block through a support shaft.

[0017] Preferably, the flow detection structure is a capacitive gate position sensor, wherein the movable part is a moving gate, the fixed part is a fixed gate, and the capacitive gate position sensor is communicatively connected to the controller. The capacitive gate position sensor has better stability and detection accuracy, reduces errors caused by optical coupling failure or insufficient accuracy, and ensures the long-term stability and reliability of the injection pump.

[0018] A method for using a multi-channel injection pump, comprising a multi-channel injection pump as described above, wherein the multi-functional injection pump receives an instruction, wherein the instruction comprises extracting a set amount of liquid from a set liquid exchange hole and injecting it into the set liquid exchange hole, and the method for using the multi-channel injection pump comprises: S1, connecting with the liquid exchange hole of the valve body through at least two pipe fittings; S2, the controller controls the output end of the flow path switching motor to rotate according to the received instruction and the phase angle signal fed back by the signal receiver, wherein the instruction points to the liquid exchange hole to be aspirated, until it rotates to the phase angle position corresponding to the liquid exchange hole indicated by the instruction; S3, the controller controls the screw motor to rotate and control the piston rod to move according to the received command and the position signal fed back by the flow detection structure, wherein the command points to the amount of liquid to be pumped, until the piston rod reaches the position corresponding to the amount of piston liquid indicated by the command; S4, the controller controls the output end of the flow path switching motor to rotate according to the received instruction and the phase angle signal fed back by the signal receiver, wherein the instruction points to the liquid replacement hole to be injected, until it rotates to the phase angle position corresponding to the liquid replacement hole indicated by the instruction; S5. The controller controls the screw motor to rotate and the piston rod to reset according to the received command and the position signal fed back by the flow detection structure.

[0019] The injection pump is controlled to suck the liquid in a specific liquid exchange hole according to an external input instruction, and then pumps the liquid into another specific liquid exchange hole.

[0020] Preferably, during steps S1 to S5, the controller receives a temperature signal generated by a temperature sensor, and when the temperature signal is lower than a built-in threshold of the controller, the controller controls the self-temperature-controlled heating plate to heat up to a specified temperature range, and heats the piston according to the external environment to ensure the temperature.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) Setting up multi-channel liquid exchange holes with automatic switching of liquid exchange holes and controlling pistons to achieve high-precision automation to achieve multi-channel, high-frequency and high-precision liquid transfer; (2) Improve the accuracy and anti-interference ability of position control through capacitive position sensors; (3) Through temperature compensation, the problem of syringe piston shrinkage deformation caused by temperature fluctuations in low temperature environments can be effectively reduced, the accuracy of liquid delivery can be maintained, and the stability of the injection pump can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the present invention; Figure 2 It is a schematic diagram of another angle of the present invention; Figure 3 is a side view of the present invention; Figure 4 yes Figure 3 Sectional view at AA in the middle; Figure 5 is an exploded view of the present invention; Figure 6 is a schematic diagram of the valve body; Figure 7 This is a schematic diagram of the valve body from another angle; Figure 8 is a schematic diagram of the rotary bracket and the switching diaphragm; Fig. 9 It is a schematic diagram of the valve body and the self-controlling temperature heating plate; Fig.10 It is a schematic diagram of the method of the present invention.

[0023] In the figure: Flow path switching module 1, control module 2, liquid extraction module 3, valve body 4, switching diaphragm 5, main channel 6, liquid exchange hole 7, main channel outlet 8, flow channel groove 9, flow path switching motor 10, rotary bracket 11, protrusion 12, groove 13, set screw 14, push rod 15, disc spring 16, gasket 17, encoder CD 18, signal receiver 19, piston assembly 20, self-control temperature heating plate 21, screw 22, screw nut 23, screw motor 24, upper bearing block 25, lower bearing block 26, moving fence 27, fixed fence 28, locking pin 29, controller 30. DETAILED DESCRIPTION

[0024] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0028] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0029] Example: A multi-channel syringe pump, Figure 1 As shown, it includes a flow path switching module 1, a control module 2 and a liquid extraction module 3.

[0030] Ginseng Figures 2 to 4 As shown in FIG. 1 , the flow path switching module 1 is composed of a valve body 4, a switching diaphragm, a driving mechanism and a sealing assembly. Figure 6 and Figure 7 As shown, in some embodiments, the valve body 4 is in the shape of a truncated cone. A main flow channel 8 is provided at the center of the bottom surface of the valve body 4, and a plurality of fluid exchange holes 7 are distributed at equal intervals on the periphery, and each hole is equidistant from the main flow channel 8. Each fluid exchange hole 7 is through-going along the height direction of the truncated cone, and the main flow channel 6 is arranged along the radial direction of the truncated cone, wherein one main flow channel 8 is folded toward the side wall to form another main flow channel 8, and the other end is formed on the side wall of the truncated cone. The switching diaphragm is provided with a flow channel groove 9, which is an oblong hole, and the flow channel groove 9 passes through the center of the switching diaphragm. The switching diaphragm and the bottom surface of the valve body 4 are coaxially arranged, and the end faces of the two are in contact.

[0031] Ginseng Figure 4 and Figure 5 As shown, the switching diaphragm is driven by the flow path switching motor 10. Figure 8 As shown, the flow path switching motor 10 is connected to the rotating bracket 11 for rotation. The output shaft of the flow path switching motor 10 is connected to a coupling, and the other end of the coupling is connected to the rotating bracket 11, so that the rotating bracket 11 can rotate synchronously with the output shaft. The rotating bracket 11 is a rotating body with a larger upper part and a smaller lower part, and a through hole is provided at its axis. The through hole is also larger at the top and smaller at the bottom. In some embodiments, the wall thickness of the rotating bracket 11 is the same at all places. The side wall of the rotating bracket 11 has a protrusion 12 extending in the axial direction, and the protrusion 12 is engaged with the groove 13 of the side wall of the switching diaphragm to achieve synchronous rotation. When the flow channel groove 9 is aligned with a specific liquid exchange hole 7, the main flow channel opening 8 is connected to the hole, while other liquid exchange holes 7 are blocked and the connection is cut off. The angle control of the switching diaphragm is realized by combining an encoder disc 18 and a signal receiver 19. The encoder disc 18 is coaxially arranged and fixedly connected with the output circumference of the transmission motor. The encoder disc 18 rotates in the slot of the signal receiver 19 to monitor the rotation phase angle in real time. The signal receiver 19 , the flow path switching motor 10 and the controller 30 are electrically connected.

[0032] The sealing system includes a pre-tightening mechanism consisting of a set screw 14, a push rod 15, a disc spring 16 and a gasket 17. A thread is provided on the lower side wall of the through hole of the rotary bracket 11, and the thread is threadedly connected to the set screw 14. By adjusting the screw-in depth of the set screw 14, the upper and lower positions of the set screw 14 in the through hole can be adjusted. The set screw 14 is fitted with a push rod 15, and the push rod 15 is slidably connected in the rotary bracket 11. The push rod 15 abuts against the gasket 17 through the disc spring 16, and the gasket 17 is fitted with the switching diaphragm. The push rod 15 compresses the disc spring 16 to generate elastic pressure, so that the gasket 17 forms a controllable pressing force on the switching diaphragm to ensure the sealing fit with the end face of the valve body 4. The gasket 17 first realizes the abutment of the switching diaphragm against the rotary bracket 11 to prevent liquid leakage, and secondly, it also performs liquid sealing on the switching diaphragm to prevent liquid from flowing out of the flow channel groove 9.

[0033] The liquid extraction module 3 includes a piston assembly 20 and a driving mechanism, wherein the piston assembly 20 includes a cylindrical (equal cross-section) piston cylinder 20, a PTFE piston body 20, and a piston rod 20. The inlet of the piston assembly 20 is connected to the main flow channel 8 on the side wall of the valve body 4. The driving mechanism is a screw motor 24, and the output shaft of the screw motor 24 is a screw 22. The screw 22 is provided with a screw 22 slider, and the screw 22 and the screw 22 slider form a screw 22 slider pair. Fig. 9 As shown, the periphery of the piston 20 cylinder is equipped with an offset self-controlling temperature heating plate 21, which is controlled by a temperature sensor in a closed loop to maintain the piston 20 body in a suitable temperature range to prevent the piston 20 body from shrinking and causing leakage. The lead screw slider pair is driven by a lead screw motor 24. The upper and lower ends of the lead screw 22 are rotatably connected to the upper bearing block 25 and the lower bearing block 26 through bearings. The lead screw motor 24 drives the lead screw nut 23 to move up and down through the lead screw 22, and the lead screw nut 23 is fixedly connected to the lock pin 29 through a fastener to realize the linear motion of the piston 20 rod. The self-controlling temperature heating plate 21 and the lead screw motor 24 are electrically connected to the controller 30. The self-controlling temperature heating plate 21 is attached to the outer wall of the piston 20 cylinder.

[0034] The control module 2 uses a capacitive gate position sensor for flow detection. The capacitive gate position sensor includes a moving gate 27 and a fixed gate 28. The moving gate 27 is fixedly connected to the piston 20 rod and the lock pin 29. As the piston 20 rod moves, it forms a displacement signal with the fixed gate 28, and realizes accurate liquid measurement through the controller 30. The controller 30 integrates a temperature sensing function and coordinates the angle control of the flow path switching motor 10 and the linkage operation of the piston 20 drive system.

[0035] The valve body 4, the screw motor 24, the flow path switching motor 10, the upper bearing block 25, and the lower bearing block 26 are all mounted on a bracket plate, and the PCB board where the moving gate 27 and the controller 30 are located is then mounted through the upper bearing block 25 and the lower bearing block 26. The PCB board is electrically connected to the screw motor 24, the flow path switching motor 10, and the self-controlling temperature heating plate 21 in a wired manner and communicates.

[0036] How the system works: By connecting the flow channel groove 9 with different liquid exchange holes 7, multi-channel liquid circuit switching is realized. When the piston 20 is sucked, negative pressure is formed to suck the liquid in the selected channel, and when pressurized, it is output through the switched channel. Displacement detection and temperature compensation work together to ensure the infusion accuracy under different working conditions. Encoder positioning and capacitive sensor data are linked to form a closed-loop control system.

[0037] Ginseng Fig.10As shown, a method for using a multi-channel injection pump includes a multi-channel injection pump as described above, wherein the multi-functional injection pump receives an instruction, wherein the instruction includes extracting a set amount of liquid from a set liquid exchange hole 7 and injecting it into the set liquid exchange hole 7, and the method for using the multi-channel injection pump includes: S1, connecting with the liquid exchange hole 7 of the valve body 4 through at least two pipe fittings; S2, the controller 30 controls the output end of the flow path switching motor 10 to rotate according to the received instruction and the phase angle signal fed back by the signal receiver 19, wherein the instruction points to the liquid exchange hole 7 to be aspirated, until it rotates to the phase angle position corresponding to the liquid exchange hole 7 indicated by the instruction; S3, the controller 30 controls the screw motor 24 to rotate and control the piston 20 to move according to the received instruction and the position signal fed back by the flow detection structure, wherein the instruction points to the amount of liquid to be pumped, until the piston 20 reaches the position corresponding to the amount of liquid in the piston 20 indicated by the instruction; S4, the controller 30 controls the output end of the flow path switching motor 10 to rotate according to the received instruction and the phase angle signal fed back by the signal receiver 19, wherein the instruction points to the liquid replacement hole 7 to be injected, until it rotates to the phase angle position corresponding to the liquid replacement hole 7 indicated by the instruction; S5. The controller 30 controls the screw motor 24 to rotate the control piston 20 to reset according to the received command and the position signal fed back by the flow detection structure.

[0038] The instruction is received in a wired or wireless manner. The instruction includes the setting of the liquid extraction port and the liquid injection port, and the amount of liquid to be transferred. The terminal communicates with the controller 30. The terminal is a mobile phone, a computer or a tablet.

[0039] When multiple liquid exchange ports (greater than two) are set, the liquid supply method can be achieved that one channel enters the liquid, while multiple channels exit the liquid: the liquid exchange port for liquid inlet is performed once or multiple times (adjusted according to the total liquid inlet volume), and liquid is injected into multiple channels. By configuring instructions, the injection volume and injection cycle can be customized to meet experimental needs.

[0040] For the setting of connecting two liquid exchange ports, in order to prevent fooling, the following setting is made in some embodiments: The screw motor 24 is set as a stepper motor, and the controller 30 detects the current driving the screw motor 24. After executing step S2, the screw motor 24 is controlled to rotate to pump liquid, and the current value is detected. When the current size meets the current characteristics built into the controller 30 (the current characteristics meet the characteristics shown when pumping liquid from an empty container), it means that the input liquid exchange port has reversed the liquid inlet and liquid outlet. Therefore, a reminder is given through the terminal or the liquid exchange ports for pumping and discharging are swapped in the controller 30 and steps S2 to S5 are re-executed.

[0041] The principle of the above arrangement is that the force required to pull out the piston 20 from an empty container and a container with liquid is different, and the current generated by the stepper motor when performing the above two operations is also different. Therefore, when the characteristics of "pulling liquid" from an empty container are detected during liquid extraction, it can be considered that the pipe is connected incorrectly.

[0042] The injection pump is controlled to suck the liquid in a specific liquid exchange hole 7 according to an external input instruction, and then pumps it into another specific liquid exchange hole 7.

[0043] In the process of steps S1 to S5, the controller 30 receives the temperature signal generated by the temperature sensor. When the temperature signal is lower than the built-in threshold of the controller 30, the controller 30 controls the self-temperature-controlled heating plate 21 to heat up to the specified temperature range. The piston 20 is heated according to the external environment to ensure the temperature.

[0044] The embodiments described above are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A multi-channel syringe pump, characterized in that: It includes a flow path switching module, a control module and a liquid extraction module, wherein the flow path switching module includes a valve body and a switching diaphragm, the control module includes a controller and a flow detection structure, and the liquid extraction module includes a piston driven by a lead screw slider pair; The valve body is provided with a main flow channel and a plurality of liquid exchange holes, the switching diaphragm can rotate relative to the valve body, the main flow channel is provided with a main flow channel opening at the center of the valve body, the distances from the liquid exchange holes to the main flow channel opening are the same and the liquid exchange holes are arranged at equal intervals, the switching diaphragm is provided with a flow channel groove, when the switching diaphragm is fitted with the valve body and the flow channel groove is fitted with a liquid exchange hole, the flow channel groove connects the liquid exchange hole and the main flow channel opening; The piston is connected to another main flow channel opening of the main flow channel; The flow detection structure includes a fixed part and a movable part. The movable part moves away from or close to the fixed part as the piston rod moves. The flow detection structure generates a position signal according to the position of the movable part and determines the liquid volume of the piston.

2. A multi-channel injection pump according to claim 1, characterized in that: The flow path switching module also includes a flow path switching motor and a rotating bracket. The output shaft of the flow path switching motor is transmission-connected to the rotating bracket and drives the rotating bracket to rotate. The side wall of the rotating bracket is provided with a protrusion, and the side wall of the switching diaphragm is provided with a groove, and the protrusion is embedded in the groove.

3. A multi-channel injection pump according to claim 2, characterized in that: The swivel bracket also includes a set screw, a push rod, a disc spring and a gasket. The set screw is threadedly connected to the swivel bracket, the gasket and the switching diaphragm are fitted, the disc spring abuts between the push rod and the gasket, the set screw abuts against the push rod, and the set screw adjusts the extension amount by the threaded connection with the swivel bracket to adjust the pressure applied by the gasket to the switching diaphragm.

4. A multi-channel injection pump according to claim 2, characterized in that: The flow path switching module also includes an angle control structure, which includes an encoder disc coaxially connected to the output shaft of the flow path switching motor and a signal receiver that cooperates with the encoder disc. The signal receiver generates a phase angle signal according to the rotation angle of the encoder disc, and the signal receiver is communicatively connected to the controller.

5. A multi-channel injection pump according to claim 1, characterized in that: The piston includes a piston cylinder, a piston body, a piston rod and a heating structure. The heating structure is offset from the piston cylinder. The heating structure includes a self-controlling temperature heating plate surrounding the piston cylinder. The heating structure is communicatively connected to a controller, and a temperature sensor is provided on the controller.

6. A multi-channel injection pump according to claim 1, characterized in that: The lead screw slider pair comprises a lead screw and a lead screw nut, the lead screw nut is fixedly connected with a lock pin, the lead screw is transmission-connected with a lead screw motor, the lead screw motor drives the lead screw to rotate, and the lock pin is fixedly connected with the piston rod.

7. A multi-channel injection pump according to claim 6, characterized in that: The screw rod is inserted into the upper bearing block and the lower bearing block, the screw rod and the upper bearing block and the lower bearing block are rotatably connected, and the controller is installed on the upper bearing block and the lower bearing block through a supporting shaft.

8. A multi-channel injection pump according to claim 1, characterized in that: The flow detection structure is a capacitive gate position sensor, wherein the movable part is a moving gate, the fixed part is a fixed gate, and the capacitive gate position sensor is communicatively connected with a controller.

9. A method for using a multi-channel injection pump, characterized in that: A multi-channel injection pump according to any one of claims 1 to 8, wherein the multi-functional injection pump receives an instruction, wherein the instruction includes extracting a set amount of liquid from a set liquid exchange hole and injecting it into the set liquid exchange hole, and the method of use includes: S1, connecting with the liquid exchange hole of the valve body through at least two pipe fittings; S2, the controller controls the output end of the flow path switching motor to rotate according to the received instruction and the phase angle signal fed back by the signal receiver, wherein the instruction points to the liquid exchange hole to be aspirated, until it rotates to the phase angle position corresponding to the liquid exchange hole indicated by the instruction; S3, the controller controls the screw motor to rotate and control the piston rod to move according to the received command and the position signal fed back by the flow detection structure, wherein the command points to the amount of liquid to be pumped, until the piston rod reaches the position corresponding to the amount of piston liquid indicated by the command; S4, the controller controls the output end of the flow path switching motor to rotate according to the received instruction and the phase angle signal fed back by the signal receiver, wherein the instruction points to the liquid replacement hole to be injected, until it rotates to the phase angle position corresponding to the liquid replacement hole indicated by the instruction; S5. The controller controls the screw motor to rotate and the piston rod to reset according to the received command and the position signal fed back by the flow detection structure.

10. The method for using a multi-channel injection pump according to claim 9, characterized in that: During steps S1 to S5, the controller receives a temperature signal generated by a temperature sensor. When the temperature signal is lower than a threshold built into the controller, the controller controls the self-temperature-controlled heating plate to heat up to a specified temperature range.

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