High-precision control stepping motor driven proportional control electric pinch valve

Abstract

The invention discloses a high-precision control stepping motor driven proportional control electric pinch valve which comprises an electric push rod, a flange bottom plate, an adapter plate, a piston chuck assembly and a valve body. The flange bottom plate is fixedly arranged on the contraction end profile of the electric push rod through bolts and nuts; one end of the adapter plate is fixed on the flange bottom plate through screws, and the other end is fixed at one end of the valve body through screws; the piston chuck assembly is connected to a piston rod of the electric push rod through a bolt and located in the valve body. A hole for inserting a pin is reserved in the valve body, and the pin is fixed through a set screw; the safety baffle is fixed to the valve body through an inner hexagonal screw or a flat-end knurled large-end hand screw and corresponds to a pipe fitting inserting groove formed in the valve body. The pinch valve has the advantages of being compact in structure, low in power, low in noise, large in clamping force and capable of achieving proportional control and clamping keeping, an additional air source system does not need to be arranged, and the pinch valve is very suitable for the application field needing large clamping force.

Description

Technical Field

[0001] The invention relates to the technical field of step-type electric pinch valves, in particular to a high-precision controlled, step-motor driven proportionally regulated electric pinch valve. Background Art

[0002] The stepper motor pinch valve is a fluid control valve. The motor output force exerts a squeezing force on the outer surface of the flexible hose to keep the pipe in a sealed closed state. It can control the fluid flow pressure. The mechanism is driven by a stepper motor connected to a linear actuator. The proportional control can flexibly adjust the valve opening from fully open to closed and any position in between. It has high performance and high reliability. This control provides a robust solution for precise closed loops and is designed for biopharmaceuticals, bioprocessing, food packaging, biotechnology, drug delivery, etc.

[0003] Existing electromagnetic pinch valves cannot achieve precise closed-loop control of proportions. Traditional pinch valves only have the function of switching and cannot achieve downstream pressure and proportion regulation functions through closed-loop PID algorithms, which are required in biopharmaceuticals, food packaging, and bioprocess applications. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a high-precision controlled, stepper motor driven proportional adjustment electric clamp valve, which has a compact structure, low noise, large clamping force, can achieve precise proportional control of flow rate, and can be clamped and maintained.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a high-precision controlled, stepper motor driven proportionally regulated electric pinch valve, which is characterized by comprising an electric push rod, a flange bottom plate, an adapter plate, a piston chuck assembly and a valve body; The flange base plate is fixed to the shrink end profile of the electric push rod by bolts and nuts; One end of the adapter plate is fixed to the flange bottom plate by screws, and the other end is fixed to one end of the valve body by screws; The piston chuck assembly is connected to the piston rod of the electric push rod by bolts and is located inside the valve body; a hole for inserting a pin is reserved on the valve body, and the pin is fixed by a set screw; The safety baffle is fixed to the valve body by means of hexagon socket screws or flat knurled big head hand screws, and corresponds to the pipe slot opened on the valve body; The piston chuck assembly includes a chuck, a hexagon socket plug, a rolling bearing, a bearing nut, and a compression spring; The chuck is fastened to the bearing nut through a hexagon socket plug, a compression spring is arranged between the chuck and the bearing nut, and the compression spring sleeve is placed on the hexagon socket plug; two rolling bearings are connected to the two ends of the bearing nut through screws, and a limiting groove corresponding to the rolling bearing is arranged on the inner wall of the valve body.

[0006] The beneficial effects of the present invention are: compact structure, low power, low noise, large clamping force, proportional control and clamping and holding functions, no need to arrange an additional air source system, and it is very suitable for application fields requiring large clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 A schematic cross-sectional structure diagram of a high-precision controlled, stepper motor driven proportionally regulated electric pinch valve provided by the present invention; Figure 2 A schematic cross-sectional structure diagram of another perspective of a high-precision controlled, stepper motor driven proportionally regulated electric pinch valve provided by the present invention; Figure 3 for Figure 1 A magnified view of point A; Figure 4 for Figure 1 Schematic diagram of the structure after the middle piston chuck moves toward the pipe fitting; Figure 5 for Figure 1 A top view of Figure 6 for Figure 2 A top view of Figure 7 A schematic diagram of the disassembled structure of a high-precision controlled, stepper motor driven proportionally regulated electric pinch valve provided by the present invention; Figure 8 A schematic diagram of the structure of a high-precision controlled, stepper motor driven proportionally regulated electric pinch valve chuck provided by the present invention; Fig. 9 A schematic structural diagram of a high-precision controlled, stepper motor driven proportionally regulated electric pinch valve provided by the present invention assembled together.

[0009] Explanation of the reference numerals: 1. Electric push rod; 2. Screw; 3. Flange base plate; 4. Adapter plate; 5. Hexagon socket plug; 6. Valve body; 7. Hexagon socket screw; 8. Safety baffle; 9. Pin; 10. Set screw; 11. Chuck; 12. Compression spring; 13. Bearing nut; 14. Rolling bearing; 15. Limiting groove; 16. Product label. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0011] like Figure 1-Figure 9 As shown, a high-precision controlled, stepper motor driven proportional adjustment electric pinch valve comprises an electric push rod 1, a flange base plate 3, an adapter plate 4, a piston chuck 11 assembly and a valve body 6; The electric push rod 1 drives the telescopic rod of the stepping motor to operate through the high and low levels of the host computer controller; The flange base plate 3 is fixed to the profile of the electric push rod 1 by means of self-tapping screws 2; One end of the adapter plate 4 is fixed to the flange base plate 3 by means of a fastening screw 2, and the other end is fixed to the valve body 6 by means of a screw 2; The piston chuck 11 assembly includes a chuck 11, a hexagon socket plug 5, a rolling bearing 14, a bearing nut 13, and a compression spring 12; the piston chuck 11 assembly is connected to the telescopic rod by bolts; The chuck 11 is fastened to the bearing nut 13 through the hexagon socket plug 5, a compression spring 12 is arranged between the chuck 11 and the bearing nut 13, and the compression spring 12 is sleeved on the hexagon socket plug 5; two rolling bearings 14 are connected to the two ends of the bearing nut 13 through screws 2, and a limiting groove 15 corresponding to the rolling bearing 14 is arranged on the inner wall of the valve body 6; Insert the pin 9 into the reserved hole of the valve body 6, and then fix the pin 9 with the hexagon socket flat-end set screw 2; The safety baffle 8 is fixed to the valve body 6 by a hexagon socket screw 7 or a flat knurled big head hand screw. The safety baffle 8 has the functions of warning safety, dustproof, waterproof and preventing the pipe fittings from falling off. The cover plate can be turned over for easy maintenance or replacement of pipe fittings.

[0012] Working principle: The electric pinch valve is driven by a stepper motor. The drive system consists of a DC stepper motor and a lead screw limit switch, etc., which provide stable and reliable drive for the stepper electric pinch valve.

[0013] The pipe fitting is inserted into the pipe fitting slot provided in the valve body 6, and the upper computer sends pulses to the stepper motor to control the stroke of the electric push rod 1, and the electric push rod 1 drives the piston chuck 11 assembly to move, and the chuck 11 moves toward the pipe fitting to clamp it; In order to reduce friction, rolling bearings 14 are installed at both ends of the bearing nut 13. In order to prevent the compression of the pipe during operation, the limit groove 15 on the inner wall of the valve body 6 mechanically limits the formation of the clamp 11, controls the compression of the pipe seal, and improves the life of the pipe.

[0014] The motor type is stepping type, and the control is simple and convenient. The external motor driver is used for subdivision settings, dip switch settings, 16 options, output current, dip switch settings, maximum peak 3A, current control, PI current control algorithm, high-speed and high-torque output, low vibration, low noise, and low heat. The control methods include pulse and direction control, internal jumper, built-in oscillator or switch signal to control the start and stop of the motor, and the speed can be adjusted to achieve proportional control of the screw stroke, thereby controlling the proportional flow output, which has a competitive advantage over brushless or brushed motors in controlling flow accuracy output.

[0015] This electric pinch valve is designed for closed-loop control, and works with feedback information from upstream or downstream flow sensors (flow or pressure) to send critical system data to logic devices; The electric pinch valve has a completely detachable chuck 11, and the valve body 6 and the piston are easy to clean and sterilize; The low torque design of this electric pinch valve provides the best performance for short strokes and precise movement. It is ideal for proportional fluid control and effectively manages low torque and high thrust loads in fixed positions, maintaining a constant torque state for continuous operation. This electric pinch valve with variable current control is designed for high load applications, providing energy efficiency under extreme conditions; This electric pinch valve has an external encoder to prevent step loss; This stepper motor type pinch valve can cut off the medium without causing surging or dead zone. It is especially suitable for biopharmaceutical chromatography filtration, food packaging, industrial chemistry and other process-related industries with relatively hard and thick hoses in the flow path.

[0016] This electric pinch valve has low working noise in addition to the basic characteristics of traditional pinch valves, such as direct-through, non-contact, and no dead volume; This electric pinch valve is applicable to a wide range of pipe diameters, supporting hose outer diameters of 1.6-36mm; This electric pinch valve is suitable for a wide range of pipe materials, and is compatible with PU, PVC, braided silicone tubes, FFKM, TPE and other high hardness pipes; This electric pinch valve has high clamping force and can clamp the pipe normally when the hardness is Shore 75A and the medium pressure in the pipe is as high as 5.5Bar; The valve body 6 of the electric pinch valve is available in anodized aluminum and stainless steel. The screw rod is made of cold-rolled stainless steel, the screw rod surface is coated with Teflon, and the nut is made of special engineering plastics with self-lubricating material. The radial clearance between the screw rod and the nut is relatively precise 0.05-0.1mm; The electric pinch valve seals to prevent liquid leakage, making cleaning or disinfection very easy, and the average trouble-free life span can reach 3 million times.

[0017] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high-precision controlled, stepper motor driven proportional adjustment electric pinch valve, characterized in that: It includes an electric push rod, a flange base plate, an adapter plate, a piston chuck assembly and a valve body; The flange base plate is fixed to the shrink end profile of the electric push rod by bolts and nuts; One end of the adapter plate is fixed to the flange bottom plate by screws, and the other end is fixed to one end of the valve body by screws; The piston chuck assembly is connected to the piston rod of the electric push rod by bolts and is located inside the valve body; a hole for inserting a pin is reserved on the valve body, and the pin is fixed by a set screw; The safety baffle is fixed to the valve body by means of hexagon socket screws or flat knurled big head hand screws, and corresponds to the pipe slot opened on the valve body; The piston chuck assembly includes a chuck, a hexagon socket plug, a rolling bearing, a bearing nut, and a compression spring; The chuck is fastened to the bearing nut through a hexagon socket plug, a compression spring is arranged between the chuck and the bearing nut, and the compression spring sleeve is placed on the hexagon socket plug; two rolling bearings are connected to the two ends of the bearing nut through screws, and a limiting groove corresponding to the rolling bearing is arranged on the inner wall of the valve body.

Images