A kind of support compatible communication control step motor pinch valve

Abstract

The utility model belongs to the technical field of pinch valve, provide a kind of support compatible communication control step motor pinch valve, it includes: drive unit, it includes brushless step motor, brushless step motor output end is equipped with screw rod;Valve body, flange is fixedly installed between drive unit and valve body, clamping groove is opened in valve body periphery, and cylindrical pin is fixed in clamping groove inner wall;Clamping unit, it includes the piston of limiting sliding in valve body, chuck fixed in the bottom end of piston;Control panel, with brushless step motor electric connection, control panel is integrated with FOC algorithm;The utility model sets up drive unit, valve body, clamping unit and control panel, improve the clamping force control precision of chuck and cylindrical pin to soft tube, effectively suppress the fluid surge when valve is closed, substantially improve the compatibility and adaptability of equipment in different industrial scenarios, overall realized high-precision, high stability, high adaptability fluid control effect.

Description

Technical Field

[0001] This utility model belongs to the field of clamp valve technology, specifically a clamp valve that supports and is compatible with communication control stepper motors. Background Technology

[0002] In the field of industrial fluid control, pinch valves, as devices that clamp hoses to control fluid flow or regulate flow, are widely used in industries such as chemical, pharmaceutical, and food. Traditional pinch valves mostly use ordinary stepper motors or pneumatic drives, with simple control logic that typically relies on a fixed output current to drive the motor, making it impossible to dynamically adjust according to the actual load. Furthermore, the acceleration and deceleration control during valve operation is often a simple linear mode, which can easily lead to large impacts in the clamp movement, causing fluid surge when the valve is closed and affecting system stability.

[0003] Traditional pinch valves have built-in motors that are difficult to dynamically adjust their output according to real-time load and lack acceleration and deceleration control strategies. This results in insufficient clamping force accuracy during the clamping process, which can easily lead to over-clamping or loose clamping. At the same time, the valve is prone to fluid surge when it operates, affecting control stability and fluid system safety.

[0004] To address the problems raised in the background art, those skilled in the art have proposed a stepper motor clamp valve that supports compatible communication control. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a stepper motor clamping valve that supports compatible communication control, thereby solving the problem of insufficient clamping force accuracy during the clamping process caused by the lack of acceleration and deceleration control strategies for the built-in motor in existing clamping valves.

[0006] A stepper motor clamp valve supporting compatible communication control includes: a drive unit comprising a brushless stepper motor, wherein a lead screw is mounted on the output end of the brushless stepper motor;

[0007] The valve body has a flange fixedly installed between the drive unit and the valve body. A clamping groove is provided on the periphery of the valve body, and a cylindrical pin is fixed on the inner wall of the clamping groove.

[0008] The clamping unit includes a piston that slides within the valve body and a chuck fixed to the bottom end of the piston. The piston is threadedly engaged with a lead screw, and the position of the chuck corresponds to that of a cylindrical pin.

[0009] The control board is electrically connected to the brushless stepper motor. The control board integrates the FOC algorithm and is configured to: detect the load torque of the brushless stepper motor in real time and dynamically adjust the output current; embed an S-shaped acceleration and deceleration curve in the chuck movement trajectory to suppress fluid surge when the valve is closed.

[0010] Preferably, a limiting groove is formed in the inner cavity of the valve body, a limiting block is fixedly connected to the periphery of the piston, the limiting block slides with the limiting groove, and a wear-resistant ring is installed on the periphery of the valve body.

[0011] Preferably, the lead screw surface is coated with a Teflon coating.

[0012] Preferably, the brushless stepper motor is any one of a type 1 motor, a type 2 motor, or a type 3 motor.

[0013] Preferably, the control board supports multi-protocol communication and includes 485 communication, 232 serial port, analog input and pulse signal switching via physical DIP switches and software configuration.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention, by setting up a drive unit, valve body, clamping unit, and control board, integrates an FOC algorithm on the control board. By dynamically adjusting the output current through real-time detection of load torque, it improves the clamping force control accuracy of the chuck and cylindrical pin on the hose, effectively avoiding over-clamping or under-clamping problems. The embedded S-shaped acceleration and deceleration curves allow for smooth transition of chuck movement, effectively suppressing fluid surge when the valve is closed. Furthermore, it supports multi-protocol communication, greatly improving the compatibility and adaptability of the equipment in different industrial scenarios. Overall, it achieves high-precision, high-stability, and high-adaptability fluid control effects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the first cross-sectional structure of the present invention;

[0019] Figure 4 This is a schematic diagram of the second cross-sectional structure of the present invention.

[0020] In the picture:

[0021] 1. Flange; 3. Valve body; 301. Clamping groove; 302. Limiting groove; 4. Cylindrical pin; 5. Set screw; 7. Piston; 701. Limiting block; 8. Chuck; 9. Lead screw; 10. Wear ring; 11. Brushless stepper motor; 12. Control board. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] Example 1: As shown in the attached document Figure 1 To be continued Figure 4 As shown, this utility model provides a stepper motor clamp valve that supports compatible communication control, including a drive unit, a valve body 3, a clamping unit and a control board 12;

[0024] The drive unit includes a brushless stepper motor 11, and a lead screw 9 is installed at the output end of the brushless stepper motor 11. A flange 1 is fixedly installed between the drive unit and the valve body 3. A clamping groove 301 is opened on the periphery of the valve body 3, and a cylindrical pin 4 is fixed on the inner wall of the clamping groove 301. A limit groove 302 is opened in the inner cavity of the valve body 3. A limit block 701 is fixedly connected to the periphery of the piston 7. The limit block 701 slides with the limit groove 302. A wear-resistant ring 10 is installed on the periphery of the valve body 3. The drive unit uses a brushless stepper motor 11 as a power source. Its output shaft is rigidly fixed to the lead screw 9 through a key connection or coupling to ensure that the motor torque can be efficiently transmitted to the lead screw 9.

[0025] The brushless stepper motor 11 can be selected from three types—28, 42, and 57—based on actual operating conditions: a 28-type motor can be used for light loads and small spaces; a 42-type motor is used for medium loads such as fluid control in small production lines; and a 57-type motor is used for high loads such as industrial high-flow pipeline control. The motor housing is fixed to flange 1 with bolts, and the other end of flange 1 is bolted to valve body 3 through a sealing gasket, ensuring that the coaxiality error between the drive unit and valve body 3 does not exceed 0.05mm, thus preventing uneven wear when the lead screw 9 and piston 7 are engaged.

[0026] The clamping unit includes a piston 7 that slides within the valve body 3 and a chuck 8 fixed to the bottom of the piston 7. The piston 7 is threadedly engaged with the lead screw 9, and the position of the chuck 8 corresponds to the cylindrical pin 4. The valve body 3 is made of high-strength aluminum alloy or stainless steel, selected according to the requirements of the corrosive environment. The clamping groove 301 has a U-shaped structure, with the groove width matching the diameter of the hose to be clamped and the groove depth ensuring that the hose can be completely clamped and closed. The cylindrical pin 4 is made of wear-resistant alloy steel with a diameter of 3-8 mm. It is inserted into the pre-set pin hole of the valve body 3 through an interference fit, and its axis is perpendicular to the movement trajectory of the chuck 8, ensuring that when the chuck 8 is pressed down, the cylindrical pin 4 can form a counter-clamping force with the chuck 8. The limiting groove 302 is an axial through groove with a rectangular cross section. It is clearance-fitted with the limiting block 701 on the periphery of the piston 7 with a clearance of 0.02mm to 0.05mm. The limiting block 701 is made of polytetrafluoroethylene and is fixed to the piston 7 by screws. It can slide axially along the limiting groove 302 to restrict the piston 7 from rotating synchronously with the lead screw 9.

[0027] The wear-resistant ring 10 on the side of the valve body 3 is made of nitrile rubber or fluororubber. It is embedded in the installation contact surface between the valve body 3 and the external equipment through a groove, which reduces the friction and wear between the valve body 3 and the mounting seat, and can also buffer the vibration when the valve is operated.

[0028] The lower end face of the chuck 8 is an arc-shaped concave surface with a radius of curvature matching that of the cylindrical pin 4. The material is wear-resistant cast iron or engineering ceramics to ensure reliable clamping when in contact with the hose, while avoiding scratching the hose surface. When the brushless stepper motor 11 drives the lead screw 9 to rotate, the piston 7 moves axially along the inner cavity of the valve body 3 under the constraint of the limit block 701 and the limit groove 302, causing the chuck 8 to move closer to or away from the cylindrical pin 4, thereby clamping or releasing the hose.

[0029] The control board 12 is electrically connected to the brushless stepper motor 11. The control board 12 integrates the FOC algorithm, which is configured to: detect the load torque of the brushless stepper motor 11 in real time and dynamically adjust the output current; embed an S-shaped acceleration and deceleration curve in the movement trajectory of the chuck 8 to suppress fluid surge when the valve is closed.

[0030] The control board 12 supports multi-protocol communication and includes 485 communication, 232 serial port, analog input and pulse signal switching via physical DIP switches and software configuration.

[0031] The algorithm logic is as follows: Real-time current is collected by current sensors in the three-phase windings of the motor. The three-phase AC current is then converted into direct-axis current (Id) and quadrature-axis current (Iq) in a rotating coordinate system through coordinate transformation using the FOC algorithm (Clarke transformation → Park transformation). Since the motor output torque is proportional to the quadrature-axis current (Iq) (torque = torque constant × Iq), the algorithm directly calculates the real-time load torque using the value of Iq.

[0032] The "target torque value" corresponding to the preset target clamping force (set according to parameters such as hose material and fluid pressure).

[0033] Real-time comparison of "actual measured torque" with "target torque value":

[0034] If the actual torque is less than the target torque, such as when the clamp 8 does not clamp the hose tightly, the algorithm increases the output command of Iq, causing the motor current to increase and the torque to increase.

[0035] If the actual torque is greater than the target torque, such as if the chuck 8 is too tight, the algorithm reduces the output command of Iq, lowers the current, and avoids over-clamping.

[0036] If the torque stabilizes near the target value (within ±5% error), maintain the current to achieve precise clamping.

[0037] An S-shaped velocity curve is preset for the motion trajectory of the chuck 8, and its characteristics are:

[0038] Start-up phase: Acceleration gradually increases from 0 to its maximum value;

[0039] Intermediate phase: Maintain maximum acceleration and accelerate at a constant speed;

[0040] Approaching the target position: The acceleration gradually decreases to 0.

[0041] The algorithm divides the motion process into 7 stages: "acceleration → uniform acceleration → deceleration → uniform speed → acceleration and deceleration → uniform deceleration → deceleration and deceleration", and calculates the time and rate of change of velocity for each stage.

[0042] Based on the difference between the current position and the target position in real time, the speed command for the corresponding stage is invoked, and the motor speed is adjusted through the FOC algorithm (controlling the rate of change of Iq) so that the chuck moves strictly according to the S-curve. The S-curve, through smooth acceleration changes, makes the chuck speed transition continuously and the fluid pressure change uniformly, thereby eliminating surge.

[0043] The real-time load detection and dynamic current adjustment of the FOC algorithm can accurately control the clamping force of the clamp 8, avoiding the problems of over-clamping (damaging the hose) or under-clamping (poor sealing) in the traditional fixed current mode.

[0044] The S-shaped acceleration / deceleration curve effectively suppresses the impact of the chuck's movement, allowing the fluid velocity to change smoothly during valve closure, thus completely solving the fluid surge phenomenon caused by traditional linear acceleration / deceleration. It is especially suitable for precision fluid control systems.

[0045] Multi-protocol communication support allows valves to be directly connected to different industrial control systems (such as PLC, DCS, and host computer) without the need for additional conversion modules; the option of 28 / 42 / 57 motors can match various hose specifications from micro to large, expanding the range of application scenarios.

[0046] As can be seen from the above, a type 28, 42, or 57 brushless stepper motor 11 is selected as the power source according to the actual working conditions. Its output shaft is rigidly fixed to the lead screw 9 through a key connection or coupling. The motor housing is fixed to the valve body 3 through the flange 1 to ensure that the coaxiality error does not exceed 0.05mm. When the brushless stepper motor 11 drives the lead screw 9 to rotate, the piston 7 moves axially under the constraint of the sliding fit between the limit block 701 and the limit groove 302 in the inner cavity of the valve body 3. This causes the bottom chuck 8 to approach or move away from the cylindrical pin 4 on the inner wall of the clamping groove 301 of the valve body 3, thereby clamping or releasing the hose. The wear-resistant ring 10 on the periphery of the valve body 3 can reduce friction and wear and buffer vibration. The control board 12 embeds an S-shaped acceleration and deceleration curve in the motion trajectory of the chuck 8 through the integrated FOC algorithm, divides the motion into 7 stages, and adjusts the motor speed in real time to make the speed of the chuck 8 transition smoothly and suppress fluid surge.

[0047] Example 2: Based on Example 1, the surface of the lead screw 9 is coated with a Teflon coating.

[0048] As can be seen from the above, the lead screw 9 is made of cold-rolled stainless steel, and the surface is coated with Teflon coating by electrostatic spraying process; the coating thickness is controlled between 5μm and 15μm. Before spraying, the surface of the lead screw 9 needs to be sandblasted to remove oxide scale and oil stains, ensuring that the coating and the substrate have a bonding force ≥5N / cm.

[0049] After coating, the material is cured at 200-300℃ for 1-2 hours to allow Teflon molecules to form stable chemical bonds with the surface of the lead screw 9. The coating covers the threaded working surface and cylindrical surface of the lead screw 9, but a 5-10mm uncoated area should be left at both ends of the connection to avoid affecting the connection accuracy.

[0050] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stepper motor clamp valve supporting compatible communication control, characterized in that: include: The drive unit includes a brushless stepper motor (11), the output end of which is equipped with a lead screw (9); The valve body (3) is fixedly installed with a flange (1) between the drive unit and the valve body (3). A clamping groove (301) is opened on the periphery of the valve body (3), and a cylindrical pin (4) is fixed on the inner wall of the clamping groove (301). The clamping unit includes a piston (7) that is limited to sliding within the valve body (3) and a chuck (8) fixed to the bottom end of the piston (7). The piston (7) is threadedly engaged with the lead screw (9), and the position of the chuck (8) corresponds to the cylindrical pin (4). The control board (12) is electrically connected to the brushless stepper motor (11). The control board (12) integrates the FOC algorithm and is configured to: detect the load torque of the brushless stepper motor (11) in real time and dynamically adjust the output current; embed an S-shaped acceleration and deceleration curve in the movement trajectory of the chuck (8) to suppress fluid surge when the valve is closed.

2. The stepper motor clamp valve supporting compatible communication control as described in claim 1, characterized in that: The valve body (3) has a limiting groove (302) in its inner cavity, and the piston (7) is fixedly connected to a limiting block (701) on its periphery. The limiting block (701) slides with the limiting groove (302), and a wear-resistant ring (10) is installed on the periphery of the valve body (3).

3. The stepper motor clamp valve supporting compatible communication control as described in claim 1, characterized in that: The lead screw (9) is coated with a Teflon coating.

4. The stepper motor clamp valve supporting compatible communication control as described in claim 1, characterized in that: The brushless stepper motor (11) is any one of the following: type 28 motor, type 42 motor, and type 57 motor.

5. The stepper motor clamp valve supporting compatible communication control as described in claim 1, characterized in that: The control board (12) supports multi-protocol communication and includes 485 communication, 232 serial port, analog input and pulse signal, which can be switched by physical DIP switch and software configuration.

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