Mechanical valve sequence control device and working method thereof

Through the mechanical valve sequence control device, the precise control of the valve is achieved by using the cam and the rod guide mechanism, and the problem of insufficient accuracy and reliability of valve control in the high-pressure fluid environment in the prior art is solved, and high-precision and reliable valve control is achieved, which is suitable for a variety of environments.

CN119572774APending Publication Date: 2025-03-07NANJING PINHUI JUNENG TECH CO LTD
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Patent Information

Application Number
CN202411786062.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-06
Publication Date
2025-03-07

AI Technical Summary

Technical Problem

The existing valve control devices are difficult to achieve precise control in high-pressure fluid environments, and are ineffective in harsh environments, are costly and susceptible to electromagnetic interference.

Method used

Mechanical valve sequence control devices are adopted, including cam, rod guide mechanism, reducer and motor, and the valve opening and closing and flowing state sequential circulation control is achieved through the mechanical mechanism to avoid wear and leakage caused by high-frequency actions of the pneumatic actuators.

Benefits of technology

It improves the accuracy and reliability of valve control, enhances stability in harsh environments, reduces costs, and is suitable for a variety of environments, especially for high-pressure fluid occasions where valves are repeatedly opened.

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Abstract

The mechanical valve sequence control device comprises a cam, an upper cam bearing seat, a lower cam bearing seat, a base, a guide rod mechanism, a speed reducer and a motor, the lower cam bearing seat is installed on the base, the upper cam bearing seat is erected and installed on the lower cam bearing seat, a gap is formed between the upper cam bearing seat and the lower cam bearing seat, and the cam is arranged between the upper cam bearing seat and the lower cam bearing seat. The two ends of a cam main shaft of the cam are rotationally connected with the upper cam bearing seat and the lower cam bearing seat correspondingly, the speed reducer and the motor are installed on the upper cam bearing seat, the motor is connected with the speed reducer, the speed reducer is connected with the cam main shaft, and the multiple guide rod mechanisms are arranged in the circumferential direction of the cam at intervals and slidably installed on the base. One end of the guide rod mechanism abuts against the cam, and the other end controls opening and closing of the valve through meshing of a gear and a rack on the side face. A mechanical mechanism is adopted for achieving sequential circulation control over opening, closing and through-flow states of the valve, and compared with pneumatic type and electromagnetic type control, the working load is high, and reliability is high.
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Description

Technical Field

[0001] The present invention relates to the technical field of valve control, and in particular to a mechanical valve sequence control device and a working method thereof. Background Art

[0002] In industrial production, many process flows require precise, reliable and convenient control of valves to ensure safe and stable production. For example, in the chemical, petroleum, and natural gas industries, valve control is directly related to the safety of the production process and product quality. In these fields, the requirements for valve control devices are more stringent, requiring both high-precision control capabilities and reliability and stability in harsh environments.

[0003] At present, traditional valve control methods mainly rely on manual operation or simple electric or pneumatic control. Manual operation of valves is not only labor-intensive, but also in some special environments, such as high temperature, high pressure, toxic and harmful occasions, the safety of operators is difficult to guarantee. At the same time, the accuracy of manual operation is low, and it is difficult to meet the needs of precise control of parameters such as flow and pressure. Although the existing electric valve control device has improved the convenience of control to a certain extent, it also has some shortcomings. For example, electric control devices usually require complex circuits and control systems, which are costly, and are easily affected by electromagnetic interference, and the reliability needs to be improved; pneumatic control is prone to failure of pneumatic components such as cylinders due to frequent shutdown. Summary of the invention

[0004] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a mechanical valve sequence control device to improve valve control accuracy and control ability, enhance reliability and stability, reduce costs and be applicable to a variety of environments, especially suitable for high-pressure fluid occasions where the valve is repeatedly opened; and provide its working method.

[0005] Technical solution: A mechanical valve sequence control device includes a cam, an upper cam bearing seat, a lower cam bearing seat, a base, a guide rod mechanism, a reducer, and a motor. The lower cam bearing seat is installed on the base, and the upper cam bearing seat is mounted on the lower cam bearing seat with a gap between them. The cam is arranged between the two. The two ends of the cam main shaft of the cam are respectively rotatably connected with the upper cam bearing seat and the lower cam bearing seat. The reducer and the motor are respectively installed on the upper cam bearing seat, the motor is connected to the reducer, and the reducer is connected to the cam main shaft. A plurality of guide rod mechanisms are arranged at circumferential intervals of the cam, and the guide rod mechanism is slidably installed on the base. One end of the guide rod mechanism is in contact with the cam, and the other end is connected to the valve.

[0006] Furthermore, the guide rod mechanism includes a guide rod, a roller, a guide rod slide, a compression spring, a spring seat, and a rack. The guide rod is slidably connected to the guide rod slide, the guide rod slide is installed on the base, a roller is installed at one end of the guide rod, the roller points to the center of the cam and contacts with the outer ring of the cam, the other end of the guide rod is connected to the compression spring, the compression spring is installed on the base through the spring seat, a rack is installed on one side of the guide rod, and the rack meshes with the gear on the valve shaft of the valve.

[0007] Preferably, the guide rod mechanism further comprises a support roller, which is arranged on the other side of the guide rod opposite to the rack and tangent to the outer circumference of the guide rod, and is mounted on the base.

[0008] Optimally, the number of guide rod mechanisms is 4 to 6.

[0009] Furthermore, the motor is a stepper motor or a servo motor.

[0010] Furthermore, both ends of the cam main shaft are rotatably connected to the upper cam bearing seat and the lower cam bearing seat through a cam main shaft bearing respectively.

[0011] Furthermore, the upper end of the cam main shaft is connected to the upper cam bearing seat through the cam main shaft bearing, and the lower end of the cam main shaft is connected to the lower cam bearing seat through a slewing bearing or a thrust roller bearing.

[0012] Preferably, when a slew bearing is used, the slew bearing is bolted between the cam and the lower cam bearing seat.

[0013] A working method of the above-mentioned mechanical valve sequence control device comprises the following steps:

[0014] Step 1: Set the motor speed and direction;

[0015] Step 2: Assume that the number of guide rod mechanisms is N, which are numbered 1 to N in sequence. After determining whether the cam rotates clockwise or counterclockwise, turn on the motor to make the guide rod mechanism start reciprocating motion. When the cam rotates clockwise, proceed to step 3, and when it rotates counterclockwise, proceed to step 4.

[0016] Step 3: Initially, the valve at the Nth guide rod mechanism is in the opening process, the valve at the 1st guide rod mechanism is in the closing process, and the valves at the N-1th to the 2nd guide rod mechanisms are in the closed state. As the cam rotates, the valve at the N-1th guide rod mechanism is in the opening process, the valve at the Nth guide rod mechanism is in the closing process, and the valves at the N-2th to the 1st guide rod mechanism are in the closed state, and so on, until the valve at the 1st guide rod mechanism is in the opening process, and the valve at the 2nd guide rod mechanism is in the closing process, one cycle is completed, and the cam enters the next rotation cycle;

[0017] Step 4: Initially, the valve at the 1st guide rod mechanism is in the opening process, the valve at the Nth guide rod mechanism is in the closing process, and the valves at the 2nd to N-1th guide rod mechanisms are in the closed state. As the cam rotates, the valve at the 2nd guide rod mechanism is in the opening process, the valve at the 1st guide rod mechanism is in the closing process, and the valves at the N-2nd to Nth guide rod mechanisms are in the closed state, and so on, until the valve at the Nth guide rod mechanism is in the opening process, the valve at the N-1th guide rod mechanism is in the closing process, one cycle is completed, and the cam enters the next rotation cycle.

[0018] Beneficial effects: Compared with the prior art, the advantages of the present invention are:

[0019] (1) The present invention adopts a mechanical mechanism to realize the opening and closing of the valve and the sequential cycle control of the flow state. Compared with the pneumatic and electromagnetic control methods, it has a higher working load and stronger reliability.

[0020] (2) The present invention adopts a mechanical mechanism to realize valve control, thereby avoiding the failure of pneumatic actuators due to wear and leakage caused by high-frequency operation.

[0021] (3) The dimensions of each component in the present invention can be flexibly designed according to strength requirements to meet the working requirements of the large torque valve in the opening and closing and flow-through states.

[0022] (4) The motor in the invention can be a stepper motor, a servo motor or a common motor, so the device has strong adaptability and a wide range of applications.

[0023] (5) If a stepper motor or a servo motor is used in the present invention, flexible variable parameter control of the valve opening and flow time can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the top view, cross-section view and partial enlarged structure of the present invention;

[0026] Figure 3 Schematic diagram of valve open-fully open-closed-fully closed state, where (a) valve opening process, (b) valve fully open state, (c) valve closing process, (d) valve fully closed state;

[0027] Figure 4 is a control timing diagram of the present invention;

[0028] Figure 5 is a control flow chart of the present invention;

[0029] Figure 6Installation diagram of slewing bearing. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0031] A mechanical valve sequence control device, such as Figures 1 to 6 As shown, it includes a cam 1, an upper cam bearing seat 4, a lower cam bearing seat 5, a base 6, a guide rod mechanism, a reducer 17, and a motor 18. The motor 18 is a stepper motor or a servo motor or can also be a common motor.

[0032] The lower cam bearing seat 5 is installed on the base 6, and the upper cam bearing seat 4 is mounted on the lower cam bearing seat 5, with a gap between the two. The cam 1 is arranged between the two and is located in the center of the lower cam bearing seat 5. The cam 1 is arranged horizontally, and the cam main shaft 2 of the cam 1 is vertically penetrated through the middle of the cam 1. The two ends of the cam main shaft 2 are rotatably connected to the upper cam bearing seat 4 and the lower cam bearing seat 5 respectively, wherein the upper end of the cam main shaft 2 is connected to the upper cam bearing seat 4 through a cam main shaft bearing 3, and the lower end of the cam main shaft 2 is connected to the lower cam bearing seat 5 through another cam main shaft bearing 3 or a slewing bearing or a thrust roller bearing 3b. When a slewing bearing is used, the slewing bearing is installed between the cam 1 and the lower cam bearing seat 5 by bolts.

[0033] The reducer 17 and the motor 18 are respectively installed on the upper cam bearing seat 4, the motor 18 is connected to the reducer 17, and the reducer 17 is connected to the cam main shaft 2, so as to drive the cam 1 to rotate; a plurality of guide rod mechanisms are provided at circumferential intervals on the cam 1, and the guide rod mechanism is slidably installed on the base 6, one end of the guide rod mechanism is engaged with the cam 1, and the other end is engaged with the gear 14 through the rack 13 on the side of the guide rod 7, the gear 14 is fixedly connected to the valve shaft 15, and the valve shaft 15 is fixedly connected to the valve 16, and the valve 16 controls the opening and closing of the valve.

[0034] The guide rod mechanism includes a guide rod 7, a roller 8, a guide rod slide 9, a support roller 10, a compression spring 11, a spring seat 12, and a rack 13. The guide rod 7 is slidably connected with the guide rod slide 9, which is mounted on the base 6. The roller 8 is mounted on one end of the guide rod 7. The roller 8 points to the center of the cam 1 and contacts the outer ring of the cam 1. The roller 8 can reduce the friction when the guide rod 7 contacts the cam 1, thereby increasing the service life. The other end of the guide rod 7 is connected with the compression spring 11, which is mounted on the base 6 through the spring seat 12. Under the pressure of the compression spring 11, the roller 8 at the front end of the guide rod 7 is always in contact with the cam. A rack 13 is mounted on one side of the guide rod 7, which meshes with the gear 14 on the valve shaft 15 of the valve 16, thereby driving the valve 16 to open and close. The support roller 10 and the rack 13 are arranged on the other side of the guide rod 7 opposite to each other and are tangent to the outer circumference of the guide rod 7 , thereby supporting the guide rod and having a limiting and guiding function. The support roller 10 is installed on the base 6 .

[0035] The working method of the above-mentioned mechanical valve sequence control device comprises the following steps:

[0036] Step 1: Set the motor speed and direction;

[0037] Step 2: Assume that the number of guide rod mechanisms is N, which are numbered 1 to N in sequence. After determining whether the cam rotates clockwise or counterclockwise, turn on the motor to make the guide rod mechanism start reciprocating motion. When the cam rotates clockwise, proceed to step 3, and when it rotates counterclockwise, proceed to step 4.

[0038] Step 3: Initially, the valve at the Nth guide rod mechanism is in the opening process, the valve at the 1st guide rod mechanism is in the closing process, and the valves at the N-1th to the 2nd guide rod mechanisms are in the closed state. As the cam rotates, the valve at the N-1th guide rod mechanism is in the opening process, the valve at the Nth guide rod mechanism is in the closing process, and the valves at the N-2th to the 1st guide rod mechanism are in the closed state, and so on, until the valve at the 1st guide rod mechanism is in the opening process, and the valve at the 2nd guide rod mechanism is in the closing process, one cycle is completed, and the cam enters the next rotation cycle;

[0039] Step 4: Initially, the valve at the 1st guide rod mechanism is in the opening process, the valve at the Nth guide rod mechanism is in the closing process, and the valves at the 2nd to N-1th guide rod mechanisms are in the closed state. As the cam rotates, the valve at the 2nd guide rod mechanism is in the opening process, the valve at the 1st guide rod mechanism is in the closing process, and the valves at the N-2nd to Nth guide rod mechanisms are in the closed state, and so on, until the valve at the Nth guide rod mechanism is in the opening process, the valve at the N-1th guide rod mechanism is in the closing process, one cycle is completed, and the cam enters the next rotation cycle.

[0040] Taking the number of guide rod mechanisms as 4 as an example, in order to realize that one cam controls four guide rod mechanisms and thus realizes the control of four valves, the control process is as follows: Figure 3 , 4 As shown, when rod 1 is in the opening process, rod 2 is in the closing state, rod 3 is in the closing state, and rod 4 is in the closing process; when rod 2 is in the opening process, rod 3 is in the closing state, rod 4 is in the closing state, and rod 1 is in the closing process; when rod 3 is in the opening process, rod 4 is in the closing state, rod 1 is in the closing state, and rod 2 is in the closing process; when rod 4 is in the opening process, rod 1 is in the closing state, rod 2 is in the closing state, and rod 3 is in the closing process.

[0041] like Figure 5 As shown, by changing the speed or direction of the motor, the sequence of valve opening, closing and flow passage and the time of valve opening, closing and flow passage can be changed.

Claims

1. A mechanical valve sequence control device, characterized in that: The invention comprises a cam (1), an upper cam bearing seat (4), a lower cam bearing seat (5), a base (6), a guide rod mechanism, a reducer (17), and a motor (18). The lower cam bearing seat (5) is mounted on the base (6). The upper cam bearing seat (4) is mounted on the lower cam bearing seat (5). There is a gap between the two. The cam (1) is arranged between the two. The two ends of the cam main shaft (2) of the cam (1) are respectively connected to the upper cam bearing seat (4) and the lower cam bearing seat (5) for rotation. The reducer (17) and the motor (18) are respectively mounted on the upper cam bearing seat (4). The motor (18) is connected to the reducer (17). The reducer (17) is connected to the cam main shaft (2). A plurality of guide rod mechanisms are arranged at intervals in the circumferential direction of the cam (1). The guide rod mechanisms are slidably mounted on the base (6). One end of the guide rod mechanism is in contact with the cam (1), and the other end is connected to the valve (16).

2. A mechanical valve sequence control device according to claim 1, characterized in that: The guide rod mechanism comprises a guide rod (7), a roller (8), a guide rod slide seat (9), a compression spring (11), a spring seat (12), and a rack (13). The guide rod (7) is slidably connected to the guide rod slide seat (9). The guide rod slide seat (9) is mounted on a base (6). A roller (8) is mounted on one end of the guide rod (7). The roller (8) points to the center of a cam (1) and contacts the outer ring of the cam (1). The other end of the guide rod (7) is connected to a compression spring (11). The compression spring (11) is mounted on the base (6) through a spring seat (12). A rack (13) is mounted on one side of the guide rod (7). The rack (13) meshes with a gear (14) on a valve shaft (15) of a valve (16).

3. A mechanical valve sequence control device according to claim 2, characterized in that: The guide rod mechanism also includes a support roller (10), which is arranged on the other side of the guide rod (7) opposite to the rack (13) and tangent to the outer peripheral surface of the guide rod (7), and the support roller (10) is installed on the base (6).

4. A mechanical valve sequence control device according to any one of claims 1 to 3, characterized in that: The number of guide rod mechanisms is 4 to 6.

5. A mechanical valve sequence control device according to claim 1, characterized in that: The motor (18) is a stepper motor or a servo motor.

6. A mechanical valve sequence control device according to claim 1, characterized in that: The two ends of the cam main shaft (2) are rotatably connected to an upper cam bearing seat (4) and a lower cam bearing seat (5) via a cam main shaft bearing (3) respectively.

7. A mechanical valve sequence control device according to claim 1, characterized in that: The upper end of the cam main shaft (2) is connected to the upper cam bearing seat (4) through the cam main shaft bearing (3), and the lower end of the cam main shaft (2) is connected to the lower cam bearing seat (5) through a slewing bearing or a thrust roller bearing (3b).

8. A mechanical valve sequence control device according to claim 7, characterized in that: When a slewing bearing is used, the slewing bearing is installed between the cam (1) and the lower cam bearing seat (5) by bolts.

9. A method for operating a mechanical valve sequence control device as claimed in any one of claims 1 to 8, characterized in that The following steps are involved: Step 1: Set the motor speed and direction; Step 2: Assume that the number of guide rod mechanisms is N, which are numbered 1 to N in sequence. After determining whether the cam rotates clockwise or counterclockwise, turn on the motor to make the guide rod mechanism start reciprocating motion. When the cam rotates clockwise, proceed to step 3, and when it rotates counterclockwise, proceed to step 4. Step 3: Initially, the valve at the Nth guide rod mechanism is in the opening process, the valve at the 1st guide rod mechanism is in the closing process, and the valves at the N-1th to the 2nd guide rod mechanisms are in the closed state. As the cam rotates, the valve at the N-1th guide rod mechanism is in the opening process, the valve at the Nth guide rod mechanism is in the closing process, and the valves at the N-2th to the 1st guide rod mechanism are in the closed state, and so on, until the valve at the 1st guide rod mechanism is in the opening process, and the valve at the 2nd guide rod mechanism is in the closing process, one cycle is completed, and the cam enters the next rotation cycle; Step 4: Initially, the valve at the 1st guide rod mechanism is in the opening process, the valve at the Nth guide rod mechanism is in the closing process, and the valves at the 2nd to N-1th guide rod mechanisms are in the closed state. As the cam rotates, the valve at the 2nd guide rod mechanism is in the opening process, the valve at the 1st guide rod mechanism is in the closing process, and the valves at the N-2nd to Nth guide rod mechanisms are in the closed state, and so on, until the valve at the Nth guide rod mechanism is in the opening process, the valve at the N-1th guide rod mechanism is in the closing process, one cycle is completed, and the cam enters the next rotation cycle.