Single drive linkage multi-way valve control method and structure

Abstract

The application discloses a single-drive linkage multi-way valve control method and structure, belongs to the technical field of testing instruments, and specifically comprises a driving shaft and a cover plate, the side of the driving shaft is provided with the cover plate, a plurality of valve bodies are installed on the cover plate along the axial direction of the cover plate, a compression ring corresponding to each valve body is further sleeved on the driving shaft along the axial direction of the driving shaft, recessed portions and protruding portions are arranged on the compression ring, a pressing piece is further arranged between the compression ring and the valve body, one end of the pressing piece is in contact with the external contour of the compression ring, and the other end of the pressing piece is connected with the opening and closing execution end of the corresponding valve body. The single-drive linkage multi-way valve control method and structure adopt a single driving device to drive linkage control of multiple valve bodies, cancels independent electric execution mechanisms, independent electric control circuits and control points of each valve body, integrates independent execution mechanisms of the valves into a driving shaft, eliminates the problem of fault point superposition caused by multiple independent execution mechanisms, reduces system fault points to a single point, and significantly improves reliability.

Description

Technical Field

[0001] This invention belongs to the field of laboratory instrument technology, specifically relating to a single-drive linkage multi-way valve control method and structure. Background Technology

[0002] A typical integrated miniature laboratory instrument often requires several, or even more than ten, valves, along with a similar number of electric actuators. Each actuator requires its own power supply, controller points, and electrical control circuitry. This overall combination increases the complexity of the internal electrical structure, making troubleshooting, repair, and debugging significantly more difficult. Industry efforts include miniaturization to reduce size, integration to optimize valve layout, and the development of new multi-way valves to integrate electrical control and optimize structure.

[0003] Small-scale laboratory instruments typically follow a fixed sequence of operations, usually dividing the testing process into several steps. Pumps, valves, and other components are linked and controlled according to the requirements of each step, interconnected to ultimately complete the testing process. While the specific opening and closing positions of multiple valves within the sequence are clearly defined, each valve's actuator is independent. This independent control means that a problem with any single valve can cause the equipment to shut down. Ensuring that each valve remains in a low-probability failure state, or eliminating random failures, has become a pressing problem in this field. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a single-drive linkage multi-way valve control method and structure, which eliminates the problem of overlapping failure points caused by multiple independent actuators, reduces the system failure point to a single point, and significantly improves reliability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a single-drive linkage multi-way valve control structure, comprising a drive shaft and a cover plate, wherein multiple valve bodies are mounted on the cover plate along its axial direction; characterized in that: The drive shaft is also fitted with a pressure ring corresponding to each valve body along its axial direction. The pressure ring is provided with a recess and a protrusion. A pressure plate is also provided between the pressure ring and the valve body. One end of the pressure plate contacts the outer contour of the pressure ring, and the other end of the pressure plate is connected to the opening and closing actuation end of the corresponding valve body.

[0006] Preferably, the outer wall of the drive shaft is provided with a plurality of keyways along its axial direction, and the inner ring of the pressure ring is fixedly connected with a convex key corresponding to each keyway.

[0007] Preferably, it also includes a limiting mechanism, which includes a limiting paddle and a limiting switch that cooperate with each other. The limiting paddle is fixedly connected to the drive shaft, and the limiting switch is fixedly connected to the cover plate or a drive device connected to one end of the drive shaft.

[0008] Preferably, the valve body is a stop valve or a clamp valve; the pressure plate includes a stop-type pressure plate that cooperates with the stop valve and a clamp-type pressure plate that cooperates with the clamp valve.

[0009] Preferably, the pressure plate is slidably connected in a guide groove opened on the cover plate, and the pressure plate can reciprocate in a direction perpendicular to the axis of the drive shaft.

[0010] Preferably, the outer contour of the pressure ring is divided into multiple continuous circumferential blocks according to the number of process steps, and the concave and convex shape of each block matches the opening and closing state of the valve body under the corresponding step.

[0011] A control method for a single-drive linkage multi-way valve control structure includes the following steps: Step 1: Decompose the entire fluid detection process of the laboratory instrument into several fixed working steps, define the conduction / cut-off state of each valve under each step, establish a standardized step-valve control state mapping table, and clarify the switching logic constraint relationship of each valve under different steps. Step 2: Select the drive device as the only drive unit, and divide the full rotation angle of the drive shaft into equal angles according to the number of steps involved in valve control, so that each step uniquely corresponds to a fixed rotation angle position of the drive shaft, and establish a one-to-one locking relationship between the step and the rotation angle. Step 3: Based on the step sequence-valve control state mapping table, customize the corresponding number and profile specifications of pressure rings; assemble multiple pressure rings sequentially along the drive shaft axis to form a mechanical step sequence cam group that corresponds one-to-one with the multi-way valve body; Step 4: Integrate multiple valve bodies on the cover plate and configure corresponding pressure plates so that one end of the pressure plate fits the outer contour of the pressure ring and the other end presses against the moving end of the valve body, thus forming a mechanical force transmission link of pressure ring-pressure plate-valve body; Step 5: The host computer issues process sequence instructions, and the drive equipment drives the drive shaft and each pressure ring to rotate synchronously to the corresponding indexing angle. The protrusions or recesses of the outer contour of the pressure ring drive the pressure plate to generate displacement, thereby controlling the opening or closing of the corresponding valve body and completing the time-linked on / off of multiple valves.

[0012] Preferably, it also includes a zeroing step: a limit lever is set on the drive shaft, and a limit switch is set on the cover plate or the housing of the drive device; when the device is powered on, the electric drive device drives the drive shaft to rotate until the limit lever triggers the limit switch, thus completing the mechanical zeroing positioning.

[0013] Preferably, in step 2, the drive shaft is divided into 360° intervals according to the number N steps involved in valve control, with each step corresponding to a rotation angle range of 360° / N.

[0014] Preferably, in the step sequence-valve control state table, "1" indicates that the valve body is open and "0" indicates that the valve body is closed; the state sequence of each column of valve bodies is directly mapped to the concave-convex distribution of the corresponding pressure ring outer contour in the circumferential direction.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a single drive device to drive multiple valve bodies in a coordinated control manner, eliminating the independent electric actuator, independent electrical control circuit and control point of each valve body, and integrating the independent actuators of each valve into a single drive shaft. This eliminates the problem of overlapping fault points caused by multiple independent actuators, reduces the system fault point to a single point, and significantly improves reliability.

[0016] 2. This invention utilizes the mechanical pre-curing process steps of the concave-convex contour of the outer circumference of the pressure ring, locking the drive shaft angle and process steps one by one, and synchronously linking the opening and closing of multiple valve bodies, eliminating electrical control delays and action deviations. It perfectly adapts to the fixed testing process of laboratory instruments, ensuring accurate fluid control timing. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the main structure of the present invention; Figure 3 This is a schematic diagram of the main cross-sectional structure of the present invention; Figure 4 This is a three-dimensional structural diagram of the drive shaft of the present invention; Figure 5 This is a top view of Example 1 of the pressure ring structure of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the pressure ring example 2 of the present invention; In the diagram: 1. Drive device; 2. Drive shaft; 3. Cover plate; 4. Valve body; 5. Pressure ring; 51. Recess; 52. Protrusion; 53. Protruding key; 6. Pressure plate; 7. Limiting paddle; 8. Limit switch; 9. Keyway; 10. Guide groove. Detailed Implementation

[0018] 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, and 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.

[0019] Example 1 Please see Figure 1-6 This embodiment provides the following technical solution: a single-drive linkage multi-way valve control structure, including a drive shaft and a cover plate, wherein one end of the drive shaft is connected to a drive device 1, which preferably adopts a stepper motor 1 or a servo motor 1, and has its own drive control board, which can accurately start, stop and position at a fixed angle, and the output shaft of the drive device is connected to a drive shaft 2 through a coupling or directly fixed.

[0020] A cover plate is provided on one side of the drive shaft 2. The cover plate 3 is fixedly connected to the drive equipment. Multiple valve bodies 4 are installed on the cover plate 3 along its axial direction. In this embodiment, the valve bodies 4 include two types: stop valves and clamp valves, which are arranged in a mixed manner according to actual process requirements.

[0021] A pressure ring 5 corresponding to each valve body 4 is also fitted on the drive shaft 2 along its axial direction. Multiple pressure rings 5 ​​are sequentially fitted on the drive shaft 2. Each pressure ring 5 corresponds to a valve body 4 in the axial direction. Multiple keyways 9 are opened on the outer wall of the drive shaft 2 along its axial direction. The multiple keyways 9 are circumferentially distributed on the outer surface of the drive shaft 2 with the drive shaft 2 as the center. A convex key 53 corresponding to each keyway 9 is fixedly connected to the inner ring of the pressure ring 5, thereby positioning the pressure ring 5 and the drive shaft 2 circumferentially, so that the pressure ring 5 can rotate synchronously with the drive shaft 2 and can be disassembled or its position adjusted along the axial direction.

[0022] In this embodiment, a retaining ring is detachably connected to one end of the drive shaft 2 away from the drive device 1 by bolts. The retaining ring is fixedly connected to the outermost pressure ring 5 on the drive shaft 2, which is used to axially limit the multiple pressure rings 5 ​​that are slidably sleeved on the drive shaft 2, so as to prevent the pressure rings 5 ​​from falling off the drive shaft 2.

[0023] The outer contour of the pressure ring 5 is divided into multiple continuous circumferential blocks according to the number of process steps. The concave and convex shape of each block matches the opening and closing state of the valve body 4 in the corresponding step. like Figure 5 As shown, the following section uses a set of testing instruments with 16 process steps and 10 valve bodies 4 as an example to explain in detail the specific design and implementation of the pressure ring 5.

[0024] First, the entire testing process is determined to consist of 16 working steps. Under each step, the 10 valve bodies 4 are in either on (represented by "1") or off (represented by "0") states. These are summarized into a step-valve control status table, as shown in Table 1: Table 1:

[0025] The pressure plate 6 is disposed between the pressure ring 5 and the corresponding valve body 4. The pressure plate 6 is slidably connected in the guide groove 10 opened on the cover plate 3. The pressure plate 6 can slide back and forth in a vertical direction perpendicular to the axis of the drive shaft 2. The lower end of the pressure plate 6 contacts the outer contour of the pressure ring 5, and the upper end of the pressure plate 6 is connected to the opening and closing execution end of the corresponding valve body 4.

[0026] Specifically: For the stop valve, the pressure plate 6 is a stop-type pressure plate 6. The top of the stop-type pressure plate 6 slides in contact with the bottom of the valve stem of the stop valve. When the protrusion of the pressure ring 5 pushes the pressure plate 6 upward, it lifts the pressure plate 6. The upper end of the pressure plate 6 pushes the valve stem upward, compressing the return spring inside the valve body 4, and the valve closes. When the recess 51 of the pressure ring 5 rotates to the lower end of the pressure plate 6, the return spring inside the valve body 4 pushes the valve stem and the pressure plate 6 downward to reset, and the valve opens.

[0027] For the pinch valve, the pressure plate 6 is a pinch-type pressure plate 6. The upper end of the pressure plate 6 abuts against the pressure block at the bottom of the hose of the pinch valve, and the lower end of the pressure plate 6 abuts against the outer contour of the pressure ring 5. When the protrusion 52 of the pressure ring 5 rotates to the lower end of the pressure plate 6, it pushes the pressure plate 6 upward, and the upper end of the pressure plate 6 squeezes the hose to deform and stop it. When the recess 51 of the pressure ring 5 rotates to the lower end of the pressure plate 6, the hose returns to its original shape by its own elasticity, and at the same time pushes the pressure plate 6 back to its original position. The lower end of the pressure plate 6 falls into the recess 51, and the valve opens.

[0028] In this embodiment, to prevent the pressure plate 6 from sliding out of the guide groove 10, a limiting flange that cooperates with the guide groove 10 can be provided in the middle of the pressure plate 6, so that the pressure plate 6 is prevented from coming out of the guide groove 10 during the vertical sliding process in the guide groove 10.

[0029] The control structure also includes a limit mechanism, which includes a limit lever 7 and a limit switch 8. The limit lever 7 is fixedly connected to one end of the drive shaft 2 near the drive device 1 and rotates synchronously with the drive shaft 2. The limit switch 8 is fixedly installed on the cover plate 3 (or the housing of the drive device 1), and its position corresponds to the rotation trajectory of the limit lever 7. When the drive shaft 2 rotates to a specific angle, the limit lever 7 triggers the limit switch 8 to generate a zero signal or an extreme position signal.

[0030] Example 2 Based on the control structure of Embodiment 1, this embodiment provides a single-drive linkage multi-way valve control method, the specific steps of which are as follows: Step 1: Taking the fluid detection process of a certain laboratory instrument as an example, the process requires a total of 24 working steps, of which 16 steps involve valve control. Analyze the conduction / cutoff requirements of each valve body 4 (a total of 8 valve bodies 4) under each step, and establish a step-valve control state mapping table. Each column in the table is an 8-bit binary number, representing the open / closed state of a valve body 4 under the 16 steps.

[0031] Step 2: Select drive device 1 as the only drive unit, and divide the full rotation angle of drive shaft 2 into equal angles according to the number of steps involved in valve control, so that each step uniquely corresponds to a fixed rotation angle position of drive shaft 2, and establish a one-to-one locking relationship between step sequence and rotation angle.

[0032] For example: Establish a locking relationship between step sequence and angle: step sequence 1 corresponds to 0°~22.5°, step sequence 2 corresponds to 22.5°~45°, ..., step sequence 16 corresponds to 337.5°~360°. When the host computer issues the step sequence command, the drive device 1 directly drives the drive shaft 2 to rotate to the middle position of the corresponding angle range (e.g., step sequence 1 corresponds to 11.25°).

[0033] Step 3: Based on the 0 / 1 sequence of each column (each valve body 4) in the step sequence-valve control state mapping table, determine the outer contour shape of the pressure ring 5 corresponding to the valve body 4. Distribute the 16 equally divided angular regions sequentially. If the valve body 4 needs to be opened in a certain step sequence, the corresponding region is machined as a protrusion 52; if it needs to be closed, it is machined as a recess 51. Place the machined 8 pressure rings 5 ​​sequentially onto the drive shaft 2 according to the valve body 4 sequence, and achieve circumferential fixation through the convex key 53 and keyway 9 to form a mechanical step sequence cam assembly.

[0034] Step 4: Install eight valve bodies 4 (including stop valves and clamp valves) on the cover plate 3, and configure corresponding stop-type pressure plates 6 or clamp-type pressure plates 6. Each pressure plate 6 is installed in the guide groove 10 of the cover plate 3 and can slide in a direction perpendicular to the axis of the drive shaft 2. The bottom end of the pressure plate 6 contacts the outer contour of the pressure ring 5, and the top end of the pressure plate 6 is connected to the opening and closing actuation end of the corresponding valve body 4. At this point, the mechanical force transmission link of pressure ring 5—pressure plate 6—valve body 4 is established.

[0035] Step 5: After the system is powered on, the zeroing step is executed first: the drive device 1 drives the drive shaft 2 to rotate slowly until the limit switch 7 triggers the limit switch 8. At this time, the system records the current angle of the drive shaft 2 as the starting position of the reference zero position corresponding to step 1. Then, the host computer issues the current step sequence command, such as step 3, according to the detection process. The drive device 1 drives the drive shaft 2 to rotate to the angle corresponding to step 3 (between 45° and 67.5°, for example, 56.25°). At this time, each pressure ring 5 rotates synchronously to the corresponding angle position. The protrusion 52 or recess 51 of the outer contour of each pressure ring 5 drives the corresponding pressure plate 6 to produce an upward or downward displacement, so that each valve body 4 simultaneously reaches the opening or closing state required by step 3. When it is necessary to switch to the next sequence, the host computer issues a new sequence command, and the drive device 1 drives the drive shaft 2 to rotate to the angle corresponding to the new sequence, thus completing the timing linkage of the multi-way valves to open and close.

[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 single-drive linkage multi-way valve control structure, comprising a drive shaft (2) and a cover plate (3), wherein a plurality of valve bodies (4) are mounted on the cover plate (3) along its axial direction; characterized in that: The drive shaft (2) is also fitted with a pressure ring (5) corresponding to each valve body (4) along its axial direction. The pressure ring (5) is provided with a recess (51) and a protrusion (52). A pressure plate (6) is also provided between the pressure ring (5) and the valve body (4). One end of the pressure plate (6) contacts the outer contour of the pressure ring (5), and the other end of the pressure plate (6) is connected to the opening and closing actuation end of the corresponding valve body (4).

2. The single-drive linkage multi-way valve control structure according to claim 1, characterized in that: Multiple keyways (9) are provided on the outer wall of the drive shaft (2) along its axial direction, and a convex key (53) corresponding to each keyway (9) is fixedly connected to the inner ring of the pressure ring (5).

3. The single-drive linkage multi-way valve control structure according to claim 1, characterized in that: It also includes a limiting mechanism, which includes a limiting paddle (7) and a limiting switch (8) that cooperate with each other. The limiting paddle (7) is fixedly connected to the drive shaft (2), and the limiting switch (8) is fixedly connected to the cover plate (3) or to the drive device (1) connected to one end of the drive shaft (2).

4. The single-drive linkage multi-way valve control structure according to claim 1, characterized in that: The valve body (4) is a stop valve or a clamp valve; the pressure plate (6) includes a stop type pressure plate (6) that cooperates with the stop valve and a clamp type pressure plate (6) that cooperates with the clamp valve.

5. The single-drive linkage multi-way valve control structure according to claim 1, characterized in that: The pressure plate (6) is slidably connected in the guide groove (10) (10) opened on the cover plate (3), and the pressure plate (6) can slide back and forth in a direction perpendicular to the axis of the drive shaft (2).

6. The single-drive linkage multi-way valve control structure according to claim 1, characterized in that: The outer contour of the pressure ring (5) is divided into multiple continuous circumferential blocks according to the number of process steps. The concave and convex shape of each block matches the opening and closing state of the valve body (4) under the corresponding step.

7. A control method employing a single-drive linkage multi-way valve control structure as described in any one of claims 1-6, characterized in that: Includes the following steps: Step 1: Decompose the entire fluid detection process of the laboratory instrument into several fixed working steps, define the conduction / cut-off state of each valve under each step, establish a standardized step-valve control state mapping table, and clarify the switching logic constraint relationship of each valve under different steps. Step 2: Select the drive device (1) as the only drive unit, and divide the rotation angle of the drive shaft (2) into equal angles according to the number of steps involved in valve control, so that each step uniquely corresponds to a fixed rotation angle position of the drive shaft (2), and establish a one-to-one locking relationship between the step and the rotation angle. Step 3: Based on the step sequence-valve control state mapping table, customize the corresponding number and profile specifications of pressure rings (5); assemble multiple pressure rings (5) sequentially along the drive shaft (2) to form a mechanical step sequence cam group that corresponds one-to-one with the multi-way valve body (4); Step 4: Integrate multiple valve bodies (4) on the cover plate (3) and configure pressure plates (6) accordingly, so that one end of the pressure plate (6) fits the outer contour of the pressure ring (5) and the other end presses against the moving end of the valve body (4), forming a mechanical force transmission link of pressure ring (5) - pressure plate (6) - valve body (4); Step 5: The host computer issues process sequence instructions, and the drive device (1) drives the drive shaft (2) and each pressure ring (5) to rotate synchronously to the corresponding indexing angle. The protrusion (52) or recess (51) of the outer contour of the pressure ring (5) drives the pressure plate (6) to generate displacement, thereby controlling the opening or closing of the corresponding valve body (4) and completing the time-linked on / off of multiple valves.

8. The single-drive linkage multi-way valve control method according to claim 7, characterized in that: It also includes a zeroing step: a limit lever (7) is set on the drive shaft (2), and a limit switch (8) is set on the cover plate (3) or the housing of the drive device (1); when the device is powered on, the drive device (1) drives the drive shaft (2) to rotate until the limit lever (7) triggers the limit switch (8) to complete the mechanical zeroing positioning.

9. The single-drive linkage multi-way valve control method according to claim 7, characterized in that: In step 2, the drive shaft (2) is divided into equal angles according to the number of steps N involved in valve control, with each step corresponding to a rotation angle range of 360° / N.

10. The single-drive linkage multi-way valve control method according to claim 7, characterized in that: In the step-valve control state table, "1" indicates that the valve body (4) is open, and "0" indicates that the valve body (4) is closed; the state sequence of each column of valve body (4) is directly mapped to the concave-convex distribution of the outer contour of the corresponding pressure ring (5) in the circumferential direction.

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