Accurate dosing device for high viscosity liquids and gels

Abstract

This invention relates to the field of delivery pump technology, specifically disclosing a device for precise quantitative delivery of high-viscosity liquids and gels. The device includes a gel container, a pump body, a rotating body, a piston, a piston-driving unit, and a rotating body-driving unit. The pump body has a piston cylinder and an output channel, with the cylinder inlet directly connected to the interior of the container. The rotating body is rotatably mounted on the pump body, with a notch in its side wall and an arc-shaped delivery groove on its bottom surface. By driving the rotating body to rotate, in the first working position, the notch aligns with the cylinder inlet to achieve liquid intake; in the second working position, the arc-shaped delivery groove connects the cylinder inlet and the output channel to achieve liquid discharge. This rotational switching of the flow path replaces the traditional one-way valve structure, fundamentally avoiding the problem of valve failure caused by high-viscosity media.

Description

Technical Field

[0001] This invention relates to the field of delivery pump technology, and more specifically to a device for precise quantitative delivery of high-viscosity liquids and gels. Background Technology

[0002] For general liquid transportation, gear pumps, centrifugal pumps, and diaphragm pumps can be used. Centrifugal pumps lack self-priming capabilities, and their output is greatly affected by changes in inlet and outlet pressures. They lack precise and repeatable delivery capabilities for small quantities of high-viscosity liquids or gels. Gear pumps are also not self-priming pumps; similarly, their output is affected by inlet and outlet pressures, making them unsuitable for the precise delivery of high-viscosity liquids or gels. Diaphragm pumps generally use a rubber diaphragm, acting as a check valve. However, for high-viscosity liquids and gels, due to their poor flowability, especially gels which are generally homogeneous mixtures of solution and fine particles, this rubber diaphragm check valve loses its reliable switching function, resulting in unstable delivery of gel liquids. Furthermore, rubber generally has poor corrosion resistance, being sensitive not only to acids and alkalis but also to organic solvents.

[0003] Generally, piston pumps are best suited for precise metering of liquids because their output is largely unaffected by inlet and outlet pressures, making them ideal for conveying liquids of varying viscosities. A drawback of ordinary piston pumps is the need for check valves. Two common types of check valves are: ball or cone check valves, which are largely unaffected by changes in inlet and outlet pressure, ensuring stable delivery; and diaphragm check valves, which use either the elasticity of rubber or spring pressure to create a seal and prevent leakage. Both types of check valves are unsuitable for liquids with poor flowability or containing fine particles, such as gels. High-viscosity liquids, especially gels, can prevent ball and diaphragm check valves from closing effectively, rendering them ineffective and causing the piston pump to malfunction. Summary of the Invention

[0004] This invention provides a device for precise quantitative delivery of high-viscosity liquids and gels to solve the above-mentioned problems.

[0005] In a first aspect, the present invention provides a device for precise quantitative delivery of high-viscosity liquids and gels, comprising:

[0006] Gel container;

[0007] The pump body is provided with a piston cylinder and an output channel, and the inlet of the piston cylinder is connected to the inside of the gel container;

[0008] A rotating body is rotatably mounted on the pump body. The side wall of the rotating body has a notch, and its bottom surface has an arc-shaped infusion groove. The arc-shaped infusion groove has a first end and a second end.

[0009] A piston is reciprocally disposed within the piston cylinder.

[0010] A drive unit is used to drive the piston to reciprocate.

[0011] A rotary drive unit is used to drive the rotating body to rotate about its axis.

[0012] The rotating body has a first working position and a second working position: in the first working position, the notch is opposite to the inlet of the piston cylinder, so that the inlet of the piston cylinder is directly connected to the gel container; in the second working position, the first end of the arc-shaped infusion groove is opposite to the inlet of the piston cylinder, and the second end of the arc-shaped infusion groove is opposite to the output channel, so that the piston cylinder is connected to the output channel via the arc-shaped infusion groove.

[0013] In one embodiment, the rotating body is rotatably connected to the pump body via a bolt shaft and a compression spring; the bolt shaft passes sequentially through a first central through hole in the pump body and a second central through hole in the rotating body, and is tightened by the compression spring and a nut to adjust the sealing pressure and rotational freedom between the contact surfaces of the rotating body and the pump body.

[0014] In one embodiment, the end of the bolt shaft is provided with a pin, and the top surface of the rotating body is provided with a pin groove that mates with the pin; the rotation drive unit includes a cylinder, and the push rod of the cylinder is connected to the bolt shaft through an eccentric rod for driving the bolt shaft to reciprocate.

[0015] In one embodiment, the drive unit is a stepper motor, which is connected to the piston rod of the piston via a lead screw and a connector.

[0016] In one embodiment, a controller is included, which is signal-connected to the stepper motor and the rotary drive unit, for coordinating the switching of the reciprocating stroke of the piston and the rotational position of the rotating body.

[0017] In one embodiment, the gel container is sealed to the pump body by welding or hot-melt welding.

[0018] In one embodiment, the pump body and / or the rotating body are made of corrosion-resistant plastic or stainless steel.

[0019] In one embodiment, the corrosion-resistant plastic is polypropylene or polyoxymethylene.

[0020] In a second aspect, the present invention also provides a method for conveying a high-viscosity liquid or gel, comprising the following steps:

[0021] Liquid aspiration step: Control the rotary drive unit to switch the rotating body to the first working position; control the drive unit to drive the piston to move away from its inlet in the piston cylinder, and draw the liquid or gel in the gel container into the piston cylinder;

[0022] Drainage steps: Control the rotary drive unit to switch the rotating body to the second working position; control the drive unit to drive the piston to move in the piston cylinder towards its inlet, so that the liquid or gel in the piston cylinder is discharged through the arc-shaped infusion groove of the rotating body and the output channel.

[0023] In one embodiment, the volume of liquid or gel aspirated in a single aspiration step is controlled by setting the stroke of the piston; the volume discharged in a single drainage step is less than or equal to the volume aspirated. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a structural diagram of a high-viscosity liquid and gel precise quantitative delivery device according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the pump body and rotating structure;

[0027] Figure 3 A schematic diagram showing the installation of the pump body and rotating components;

[0028] Figure 4 This is a schematic diagram of the pump body and rotating body in the suction position.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Gel solution container;

[0031] 200, Rotating body; 201, Notch; 210, First end; 211, Second end; 230, Second central through hole; 240, Pin groove;

[0032] 300. Pump body; 310. Piston cylinder; 311. Output channel; 312. Output connector; 330. Center through hole;

[0033] 400, Piston; 410, Piston Rod; 450, Connector;

[0034] 500. Stepper motor; 510. Lead screw;

[0035] 600. Bolt shaft; 610. Pin; 620. Eccentric rod; 630. Washer; 640. Compression spring; 650. Nut; 670. Hinged connector;

[0036] 700, cylinder; 710, push rod;

[0037] 800, Controller. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] For general liquid transportation, gear pumps, centrifugal pumps, and diaphragm pumps can be used. Centrifugal pumps lack self-priming capabilities, and their output is greatly affected by changes in inlet and outlet pressures. They lack precise and repeatable delivery capabilities for small quantities of high-viscosity liquids or gels. Gear pumps are also not self-priming pumps; similarly, their output is affected by inlet and outlet pressures, making them unsuitable for the precise delivery of high-viscosity liquids or gels. Diaphragm pumps generally use a rubber diaphragm, acting as a check valve. However, for high-viscosity liquids and gels, due to their poor flowability, especially gels which are generally homogeneous mixtures of solution and fine particles, this rubber diaphragm check valve loses its reliable switching function, resulting in unstable delivery of gel liquids. Furthermore, rubber generally has poor corrosion resistance, being sensitive not only to acids and alkalis but also to organic solvents.

[0040] Generally, the piston 400 pump is best suited for precise metering of liquids because its output is largely unaffected by inlet and outlet pressures, making it ideal for delivering liquids of varying viscosities. A drawback of the standard piston 400 pump is the need for a check valve. Two common types of check valves are used: ball or cone check valves, which are largely unaffected by changes in inlet and outlet pressure, ensuring stable delivery; and diaphragm check valves, which utilize the elasticity of rubber or spring pressure for sealing and leak prevention. Both types of check valves are unsuitable for liquids with poor flowability or containing fine particles, such as gels. High-viscosity liquids, especially gels, can prevent ball and diaphragm check valves from closing effectively, rendering them ineffective and causing the piston 400 pump to malfunction.

[0041] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0042] According to an embodiment of the present invention, a device for precise quantitative delivery of high-viscosity liquids and gels is provided, comprising a gel container 100, a pump body 300, a rotating body 200, a piston 400, a drive unit, and a rotary drive unit. The pump body 300 is provided with a piston cylinder 310 and an output channel 311, the inlet of which communicates with the interior of the gel container 100. The rotating body 200 is rotatably mounted on the pump body 300, and a notch 201 is provided on the side wall of the rotating body 200. An arc-shaped infusion groove is provided on its bottom surface, the arc-shaped infusion groove having a first end 210 and a second end 211. The piston 400 is reciprocally mounted on the piston cylinder 310. The drive unit is used to drive the piston 400 to reciprocate; the rotary drive unit is used to drive the rotating body 200 to rotate around its axis; wherein the rotating body 200 has a first working position and a second working position: in the first working position, the notch 201 is opposite to the inlet of the piston cylinder 310, so that the inlet of the piston cylinder 310 is directly connected to the gel container 100; in the second working position, the first end 210 of the arc-shaped infusion groove is opposite to the inlet of the piston cylinder 310, and the second end 211 of the arc-shaped infusion groove is opposite to the output channel 311, so that the piston cylinder 310 is connected to the output channel 311 via the arc-shaped infusion groove.

[0043] Specifically, the device mainly includes a gel container 100, a pump body 300, a rotating body 200, a piston 400, a drive unit, and a rotary drive unit.

[0044] The pump body 300 is fixedly installed at the bottom or side wall of the gel container 100. Inside the pump body 300, there is a piston cylinder 310 (with an inner diameter of D1) and an independent output channel 311. The inlet of the piston cylinder 310 opens directly at the interface between the pump body 300 and the gel container 100, thus directly communicating with the internal cavity of the container and avoiding the resistance and risk of air bubbles from any intermediate pipelines.

[0045] The rotating body 200 is cylindrical in shape, and its outer diameter matches the corresponding circular mounting cavity on the pump body 300. The rotating body 200 is rotatably supported on the pump body 300 via a rotating shaft structure, allowing the rotating body 200 to rotate around its central axis on the pump body 300. A fan-shaped notch 201 penetrating the wall thickness is formed on the cylindrical side wall of the rotating body 200. An arc-shaped groove is machined on its bottom end face, forming the arc-shaped infusion groove, which has a clearly defined first end 210 and second end 211.

[0046] The outer diameter of the piston 400 is precisely matched with the inner diameter D1 of the piston cylinder 310, allowing for leak-free reciprocating motion along the inner wall of the cylinder. The piston 400 is connected to the drive unit via a piston rod 410, which provides the power required for the piston 400's reciprocating motion. The core operation of this device relies on two predetermined working positions of the rotating body 200:

[0047] First working position (liquid suction position): Operate the rotary drive unit to rotate the rotating body 200 to a specific angle. At this time, the notch 201 on the side wall of the rotating body 200 is rotated to be opposite to the inlet of the piston cylinder 310 on the pump body 300. In this position, the notch 201 provides an unobstructed channel for the gel liquid in the container, allowing it to directly cover and contact the inlet of the piston cylinder 310. Subsequently, operate the drive unit to move the piston 400 away from the inlet in the cylinder (e.g., ...). Figure 1 As the piston moves downwards, a negative pressure is created inside the cylinder, and the gel liquid is directly drawn into the piston cylinder 310 under the action of gravity and pressure difference.

[0048] Second working position (drainage position): After completing the aspiration, operate the rotary drive unit again to rotate the rotating body 200 by a certain angle (e.g., 90° from the first position). At this time, the first end 210 of the arc-shaped infusion groove at the bottom of the rotating body 200 rotates to align with the inlet of the piston cylinder 310, while the second end 211 of the groove rotates to align with the inlet of the output channel 311 inside the pump body 300. In this way, the piston cylinder 310 is connected to the output channel 311 through the arc-shaped infusion groove inside the rotating body 200. Next, operate the drive unit to move the piston 400 towards the cylinder inlet (e.g., ... Figure 1 The liquid moves upward and applies pressure to the liquid inside the cylinder, forcing the liquid to flow sequentially through the arc-shaped infusion tank and the output channel 311, and finally be discharged from the output connector 312, completing one quantitative delivery.

[0049] By manually alternating the operation of the rotary drive unit and the piston 400 drive unit, a cyclical working process of "rotation switching flow path - piston 400 liquid suction - rotation switching flow path - piston 400 liquid discharge" can be achieved. This embodiment demonstrates that by using a rotating body 200 with a specific notch 201 and an arc-shaped groove to replace the traditional one-way valve, and in conjunction with the direct suction structure of the piston 400, it is possible to effectively achieve quantitative delivery of high-viscosity liquids and gels. The structure is basic and the principle is clear.

[0050] In one embodiment, the rotating body 200 is rotatably connected to the pump body 300 via a bolt shaft 600 and a compression spring 640; the bolt shaft 600 passes sequentially through the first central through hole 330 of the pump body 300 and the second central through hole 230 of the rotating body 200, and is pressed by the compression spring 640 and a nut 650 to adjust the sealing pressure and rotational freedom between the contact surfaces of the rotating body 200 and the pump body 300.

[0051] Specifically, a first central through hole 330 is provided at the center of the pump body 300, and a second central through hole 230 is provided at the corresponding center of the rotating body 200. During assembly, the bolt shaft 600 passes through the first central through hole 330 and the second central through hole 230 in sequence. A washer 630 and a compression spring 640 are fitted onto the threaded end of the bolt shaft 600 extending from the lower surface of the pump body 300, and finally the nut 650 is tightened.

[0052] By tightening or loosening the nut 650, the compression of the compression spring 640 can be changed, thereby adjusting the axial clamping force applied by the spring to the pump body 300.

[0053] The structure is adjusted by nut 650 so that compression spring 640 generates appropriate preload force, ensuring that the bottom surface of rotating body 200 and the top surface of pump body 300 fit tightly together, which is sufficient to prevent leakage from the mating surfaces of high viscosity liquids or gels, thus achieving a reliable end face seal.

[0054] Furthermore, the compression spring 640 provides an elastic axial clamping force, rather than a rigid locking force. Under the premise of ensuring a seal, the rotating body 200 can still be driven by the rotation drive unit to overcome a certain frictional resistance and rotate smoothly around the axis of the bolt shaft 600 under this clamping force.

[0055] In one embodiment, the bolt shaft 600 has a pin 610 at its end, and the top surface of the rotating body 200 has a pin groove 240 that mates with the pin 610; the rotation drive unit includes a cylinder 700, and the push rod 710 of the cylinder 700 is connected to the bolt shaft 600 through an eccentric rod 620 to drive the bolt shaft 600 to reciprocate.

[0056] To ensure reliable driving of the rotating body 200 by the rotary drive unit, a pin 610 is fixedly installed at the end of the bolt shaft 600 extending from the upper surface of the rotating body 200. Correspondingly, a pin groove 240 matching the shape of the pin 610 is machined on the top surface of the rotating body 200. During assembly, the pin 610 is embedded in the pin groove 240. This pin-groove fit allows the bolt shaft 600 to rotate synchronously with the rotating body 200 via the pin 610, thereby effectively transmitting the driving torque to the rotating body 200.

[0057] In this embodiment, the core of the rotary drive unit is a cylinder 700. The piston rod 410 of the cylinder 700, i.e., the push rod 710, has its end movably connected to one end of an eccentric rod 620 via a hinged connector 670. The other end of the eccentric rod 620 is fixedly connected to or integrally formed with the head of the bolt shaft 600. The installation position of the eccentric rod 620 ensures that there is a fixed radial offset distance (i.e., eccentricity) between its axis and the axis of the bolt shaft 600.

[0058] When the cylinder 700 is energized, its push rod 710 extends outward, pushing the eccentric rod 620 to swing around the axis of the bolt shaft 600. Since the eccentric rod 620 and the bolt shaft 600 are fixedly connected, the swing of the eccentric rod 620 is directly converted into the rotational motion of the bolt shaft 600 around its own axis. When the bolt shaft 600 rotates, the engagement of the pin 610 at its end with the pin groove 240 on the rotating body 200 causes the rotating body 200 to rotate synchronously by a preset angle (e.g., 90°), thereby switching from the first working position to the second working position.

[0059] Conversely, when the push rod 710 of the cylinder 700 retracts, it pulls the bolt shaft 600 to rotate in the opposite direction through the eccentric rod 620, causing the rotating body 200 to switch back to the first working position.

[0060] By controlling the opening and closing of the two air inlets of cylinder 700, the extension and retraction of push rod 710 can be precisely controlled, thereby reliably realizing the reciprocating switching of rotating body 200 between two preset working positions. The length and eccentricity of the eccentric rod 620 determine the rotation angle of rotating body 200, which can be precisely set through mechanical design.

[0061] In this embodiment, the drive unit of piston 400 can be other than stepper motor 500, such as a regular motor with crank-connecting rod mechanism, or still be manual.

[0062] In one embodiment, the driving unit is a stepper motor 500, which is connected to the piston rod 410 of the piston 400 via a lead screw 510 and a connector 450.

[0063] In this embodiment, the driving unit is specifically a stepper motor 500. The stepper motor 500 is fixedly mounted on the device frame or support structure via its mounting base, and its output shaft is coaxially connected to a lead screw 510 via a coupling. The end of the piston rod 410 of the piston 400 is connected to the lead screw 510 via a connector 450. The connector 450 has a nut 650 structure internally that matches the thread of the lead screw 510, and is externally fixedly connected to the piston rod 410. Thus, when the stepper motor 500 drives the lead screw 510 to rotate in both directions, the connector 450 converts the rotational motion of the lead screw 510 into a precise linear reciprocating motion of the piston rod 410 along its axis through the lead screw 510 nut 650 transmission pair, thereby driving the piston 400 to perform precise intake and exhaust actions within the cylinder.

[0064] In one embodiment, the high-viscosity liquid and gel precise metering delivery device includes a controller 800, which is signal-connected to the stepper motor 500 and the rotary drive unit, for coordinating the control of the reciprocating stroke of the piston 400 and the switching of the rotational position of the rotating body 200.

[0065] In one embodiment, the gel container 100 is sealed to the pump body 300 by welding or hot-melt welding.

[0066] In one embodiment, the pump body 300 and / or the rotating body 200 are made of corrosion-resistant plastic or stainless steel. Preferably, the corrosion-resistant plastic is polypropylene or polyoxymethylene.

[0067] According to an embodiment of the present invention, in another aspect, a method for conveying a high-viscosity liquid or gel is also provided, comprising the following steps:

[0068] Liquid aspiration step: Control the rotary drive unit to switch the rotating body 200 to the first working position; control the drive unit to drive the piston 400 to move away from its inlet in the piston cylinder 310, and draw the liquid or gel in the gel container 100 into the piston cylinder 310;

[0069] Drainage procedure: The rotary drive unit is controlled to switch the rotating body 200 to the second working position; the drive unit is controlled to drive the piston 400 to move within the piston cylinder 310 towards its inlet, discharging the liquid or gel within the piston cylinder 310 through the arc-shaped infusion groove of the rotating body 200 and the output channel 311. The output channel 311 is equipped with a gel liquid output connector 312.

[0070] In one embodiment, the movement stroke of the piston 400 is controlled by setting the stroke; the volume discharged in one dispensing step is less than or equal to the volume drawn in. When the output equals the input, one input can only produce one output, and the piston 400 moves the same distance up and down. When the output is less than the input, one input can produce multiple outputs. The movement patterns of the piston 400 are shown in Table 1, but are not limited to the values ​​listed in Table 1. This pattern is implemented by the program of the controller 800 that sets the stepper motor 500 and the cylinder 700. The repeated and continuous alternation of the liquid suction and dispensing processes can achieve continuous pulse liquid output, which is very suitable for the dispensing requirements of filling systems or other feeding systems.

[0071] Table 1

[0072]

[0073] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A high viscosity liquid and gel precision dosing device characterized in that, include: Gel container (100); The pump body (300) is provided with a piston cylinder (310) and an output channel (311). The inlet of the piston cylinder (310) is connected to the inside of the gel container (100). A rotating body (200) is rotatably mounted on the pump body (300). The side wall of the rotating body (200) has a notch (201), and its bottom surface has an arc-shaped infusion groove. The arc-shaped infusion groove has a first end (210) and a second end (211). A piston (400) is reciprocally disposed within the piston cylinder (310); A drive unit is used to drive the piston (400) to reciprocate. A rotation drive unit is used to drive the rotating body (200) to rotate about its axis; The rotating body (200) has a first working position and a second working position: in the first working position, the notch (201) is opposite to the inlet of the piston cylinder (310), so that the inlet of the piston cylinder (310) is directly connected to the gel container (100); in the second working position, the first end (210) of the arc-shaped infusion groove is opposite to the inlet of the piston cylinder (310), and the second end (211) of the arc-shaped infusion groove is opposite to the output channel (311), so that the piston cylinder (310) is connected to the output channel (311) via the arc-shaped infusion groove.

2. A high viscosity liquid and gel precise dosing device according to claim 1, characterized in that, The rotating body (200) is rotatably connected to the pump body (300) via a bolt shaft (600) and a compression spring (640); the bolt shaft (600) passes sequentially through the first central through hole (330) of the pump body (300) and the second central through hole (230) of the rotating body (200), and is pressed by the compression spring (640) and the nut (650) to adjust the sealing pressure and rotational freedom between the contact surfaces of the rotating body (200) and the pump body (300).

3. A high viscosity liquid and gel precise dosing device according to claim 2, characterised in that, The bolt shaft (600) has a pin (610) at its end, and the top surface of the rotating body (200) has a pin groove (240) that mates with the pin (610). The rotation drive unit includes a cylinder (700), and the push rod (710) of the cylinder (700) is connected to the bolt shaft (600) through an eccentric rod (620) to drive the bolt shaft (600) to reciprocate.

4. The device for precise metering of high-viscosity liquids and gels according to claim 1, characterized in that, The driving unit is a stepper motor (500), which is connected to the piston rod (410) of the piston (400) via a lead screw (510) and a connector (450).

5. The device for precise metering of high-viscosity liquids and gels according to claim 4, characterized in that, Includes a controller (800), which is signal-connected to the stepper motor (500) and the rotary drive unit, and is used to coordinate the switching of the reciprocating stroke of the piston (400) and the rotation position of the rotating body (200).

6. The device for precise metering of high-viscosity liquids and gels according to claim 1, characterized in that, The gel container (100) is sealed to the pump body (300) by welding or hot-melt welding.

7. The device for precise metering of high-viscosity liquids and gels according to claim 1, characterized in that, The pump body (300) and / or the rotating body (200) are made of corrosion-resistant plastic or stainless steel.

8. The device for precise metering of high-viscosity liquids and gels according to claim 7, characterized in that, The corrosion-resistant plastic is polypropylene or polyoxymethylene.

9. A method for conveying a high-viscosity liquid or gel, characterized in that, Includes the following steps: Liquid aspiration step: Control the rotary drive unit to switch the rotary body (200) to the first working position; control the drive unit to drive the piston (400) to move away from its inlet in the piston cylinder (310) to draw the liquid or gel in the gel container (100) into the piston cylinder (310). Drainage steps: Control the rotary drive unit to switch the rotary body (200) to the second working position; control the drive unit to drive the piston (400) to move in the piston cylinder (310) towards its inlet, and discharge the liquid or gel in the piston cylinder (310) through the arc-shaped infusion groove and output channel (311) of the rotary body (200).

10. The method for conveying high-viscosity liquids or gels according to claim 9, characterized in that, The volume of liquid or gel aspirated in a single aspiration step is controlled by setting the stroke of the piston (400); the volume discharged in a single drainage step is less than or equal to the volume aspirated.

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