External valve control device and pressure control system

Abstract

The invention relates to the technical field of pipeline pressure control, in particular to an external connection type valve control device and a pressure control system.The external connection type valve control device comprises an angle seat valve communicated with a fluid pipeline, and a variable-force variable-speed shell connected with a rotating rod on the angle seat valve is detachably installed on the angle seat valve; a power assembly for providing power for controlling an angle seat valve switch is detachably mounted on the variable-force variable-speed shell, and a controller mounting shell is arranged on the power assembly; the angle seat valve is separated from an automatic control controller, when one part is damaged, the part can be quickly replaced so as to reduce the maintenance cost, meanwhile, better use experience can be enjoyed at a lower price, meanwhile, the angle seat valve can be directly mounted on an existing valve, and the cost is reduced. An existing manual valve is directly changed into an automatic valve, the use range is further widened, the requirement for updating old equipment can be met, the cost of a user is reduced, and the use effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline pressure control, in particular to an external valve control device and a pressure control system. Background Art

[0002] It includes detecting the pressure in the pipeline through a pressure sensor, transferring the pressure information to a controller, and then controlling the opening and closing of the valve through the controller to control the pressure in the pipeline.

[0003] Generally, solenoid valves with a high degree of automation adopt integrated measures, that is, the controller is connected to the valve, and then the pressure in the pipeline is detected through some pressure detection structures, and the pressure is fed back to the controller. The controller controls the valve opening and closing angle and balances the pressure in the pipeline.

[0004] This type of valve is generally for special functional valves, such as balancing valves, proportional valves, electric contact pressure gauges, high-frequency solenoid valves, etc. In order to meet the different functions of different valves, special valve structures and controllers with special control logic and data processing methods are required, which leads to the need for the valve's actuator and control components to be connected as one (on the one hand, the control component can be protected by the overall structure of the valve, and on the other hand, the valve can be directly connected to the control system of the production line to achieve control of the entire large equipment or the entire assembly line). However, on the one hand, the basic principle of valve operation is opening and closing, and the difference lies in the different control logics and data processing methods of the valves, as well as the structural optimization of the corresponding functions. On the other hand, in some equipment and parts that require local automation, directly using mature automatic control valves will have unnecessary functions, resulting in low cost performance, and automatic control valves are also prone to failure after long-term use. When a failure occurs, the entire valve needs to be replaced, resulting in high costs.

[0005] Therefore, an external valve control device and a pressure control system are needed to solve the above problems. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide an external valve control device and a pressure control system.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: an external valve control device and a pressure control system, comprising an angle seat valve connected to a fluid pipeline, the angle seat valve is detachably mounted with a variable force and speed housing connected to a rotating rod on the angle seat valve, the variable force and speed housing is detachably mounted with a power assembly for providing power for controlling the switch of the angle seat valve, and a controller mounting shell is provided on the power assembly; two meshing gears that are rotatably connected in the variable force and speed housing, a hole is provided at the center position of the meshing gears, and a connecting assembly that detachably connects the meshing gears to the rotating rod on the angle seat valve or the motor output shaft is provided in the hole; the controller mounting shell is detachably mounted on the power assembly, a programmable logic controller is installed on the controller mounting shell and is electrically connected to the motor in the power assembly, and a number of pressure detectors are installed on the fluid pipeline located before and after the angle seat valve.

[0008] The present invention is further configured as follows: the programmable logic controller includes a data conversion module that converts the signal of the pressure sensor into a numerical value; a data screening module that receives the data conversion module within a unit time and converts the signal of the pressure sensor into numerical data and arranges the data from small to large by a bubbling arrangement method; a logic calculation module that receives a plurality of groups of data output by the data screening module within a unit time and calculates the plurality of groups of data into a stable average value, and the calculation formula is: Wherein, M is the stable average value; n is the data transformation module per unit time, and the number of n is greater than or equal to 4 and is an integer multiple of 4; Arrange the data entered in a unit time from small to large. The value of the bit is deduced by analogy for the remaining values ​​of a; an output electrical signal module that receives the control value output by the data change module and controls the operation of the motor, wherein the control value is obtained by converting the above-mentioned stable average value M by the data conversion module.

[0009] The present invention is further configured to include an adjustment module, an input module and a feedback adjustment module, wherein the input module includes a plurality of buttons, a display screen and a data import block, and is debugged by the following steps: S1: firstly, the controller is made to enter the mode of the adjustment module by a plurality of buttons, and then the liquid is made to flow in the fluid pipeline according to the working pressure, and the motor is controlled by the output electrical signal module to drive the valve to reciprocate from fully open to fully closed, and the stable average value P detected by the pressure detector at the downstream position of the angle seat valve detected in the process is A , the stable average value P detected by the pressure detector at the upstream position of the angle seat valve B Import into the adjustment module about P A and P B In the database, use the following formula to calculate the corresponding θ value; P A: The stable average value converted from the maximum pressure in the pipeline; P B : The stable average value detected by the pressure detector at the downstream position of the angle seat valve; π: Pi; r: The radius of the valve core in the angle seat valve used to block the channel in the angle seat valve; θ: The angle between the valve core plane of the angle seat valve and the pipeline axis; Where P A , r are input into the adjustment module through several buttons; and the corresponding θ value is compared with P B Value association; S2.1: Associate the obtained θ value with P B The value-related data relationship is imported into the output electrical signal module, and the stable average value P detected by the pressure detector at the downstream position of the angle seat valve is received. B Control the rotation position of the motor; S2.2: Synchronously perform data association on the corresponding value and the stable average value detected by the pressure detector at the downstream position of the angle seat valve detected synchronously.

[0010] The present invention is further configured as follows: the adjustment module is configured in the output electrical signal module, and further comprises the following steps: S3: inputting the stable average value detected by the pressure detector at the downstream position of the angle seat valve into the adjustment module through a plurality of buttons and a data import block, and comparing the stable average value detected by the pressure detector at the downstream position of the angle seat valve with the P value every 0.5 seconds during the working process. B The motor rotation angle is adjusted based on the value of θ plus or minus α.

[0011] The present invention is further configured to include the following steps: S4: In the actual working process, the output electrical signal module receives the stable average value detected by the pressure detector at the downstream position of the angle seat valve, and compares it with the stable average value detected by the pressure detector at the corresponding downstream position. If there is a difference, the P value is adjusted upward or downward by one unit. A And the P A The value is updated to the adjustment module; S5: When the difference between the stable average value detected by the pressure detector at the downstream position of the cumulative angle seat valve and the stable average value detected by the pressure detector at the corresponding downstream position reaches P A When the error is more than 5%, the display shows red light and prompts the operator to re-calibrate.

[0012] The present invention is further configured as follows: a plurality of circumferentially distributed mounting strips are fixedly connected to one end of the variable force speed change housing close to the angle seat valve, the mounting strip is in a "7" shape, and a bent end thereof is away from the variable force speed change housing, and a distance between the plurality of mounting strips gradually decreases from the direction away from the variable force speed change housing, and a bent end of the plurality of mounting strips clamps an upper portion of the angle seat valve.

[0013] The present invention is further configured as follows: a plurality of circumferentially distributed connecting strips are fixedly connected to the outer peripheral wall of the variable force and speed change case, the connecting strips extend upward to the side position of the power component, the connecting strips are provided with screws that pass through the connecting strips and are threadedly connected to the side wall of the power component, and a variable force and speed change cavity is opened in the variable force and speed change case, the upper and lower walls of the variable force and speed change cavity are each fixedly connected to a connecting tube, and the end of the connecting tube away from the inner wall of the variable force and speed change cavity is rotationally connected to a meshing gear respectively.

[0014] The present invention is further configured as follows: the connecting assembly includes a connecting block and a control screw, the side wall of the hole of the meshing gear is provided with a plurality of sliding grooves penetrating up and down, the connecting block slides in the sliding groove in a direction perpendicular to the axis of the meshing gear, one end of the connecting block close to the meshing gear is rotatably connected to a control screw extending to the outside of the gear on the side of the meshing gear, and the control screw is threadedly connected to the meshing gear, and a groove for inserting the connecting block is provided on the rotating rod or the motor output shaft on the angle seat valve.

[0015] The present invention is further configured such that: the installation bar has a flat cross section and can be elastically deformed along the diameter direction of a circular array of the installation bars.

[0016] The present invention is further configured as follows: the pressure detector detects and transmits data once every 0.05 seconds, and 2 seconds constitutes a group of data detection units, with a total of 20 data detected. The stable average value detected by the pressure detector at the downstream position of the angle seat valve with standard settings can be within the range of interval values, and the output pressure is controlled to change periodically within this range.

[0017] In summary, the present invention has the following beneficial effects:

[0018] On the one hand, the angle seat valve and the automatic control controller can be separated. When one of the components is damaged, it can be quickly replaced to reduce maintenance costs, while also providing a better user experience at a lower price. At the same time, the present invention can be directly installed on an existing valve to directly convert the existing manual valve into an automatic valve, further increasing the scope of use, and meeting the renewal of old equipment, reducing the user's cost and increasing the use effect. On the other hand, the angle seat valve can be used to accurately control the pressure of the fluid pipeline or mold behind the angle seat valve, and a pulse pressure compensation function can be provided to improve the molding effect of the equipment. That is, when there are pulses in the input hydraulic pressure, the fluctuating pulse hydraulic pressure can be converted into a stable output hydraulic pressure, and when a fixed pulse hydraulic pressure needs to be output, the corresponding standard hydraulic pressure can also be stably output to meet different hydraulic systems and fluid environments, thereby increasing the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the controller installation shell directly installed in the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the power assembly after the controller mounting shell and the power assembly are separately installed in the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the controller mounting shell in the present invention;

[0022] Figure 4 It is a schematic structural diagram of the variable force speed change case in the present invention;

[0023] Figure 5 It is a cross-sectional schematic diagram of the variable force speed change housing in the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the meshing gears in the present invention;

[0025] Figure 7 It is a structural schematic diagram of the connecting block in the present invention;

[0026] Figure 8 It is a schematic diagram of the code for bubble sorting in the present invention.

[0027] In the figure:

[0028] Angle seat valve 11; fluid pipeline 12; variable force and speed change housing 13; mounting strip 14; connecting strip 15; power assembly 16; controller mounting housing 17; lower through hole 18; variable force and speed change chamber 19; connecting cylinder 20; meshing gear 21; sliding groove 22; threaded hole 23; connecting block 24; control screw 25; upper through hole 26; programmable logic controller 27; pressure detector 28. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] Example:

[0031] This kind of external valve control device and pressure control system, such as Figures 1 to 8As shown, it includes an angle seat valve 11 connected to a fluid pipeline 12, a variable force speed housing 13 connected to a rotating rod on the angle seat valve 11 is detachably mounted on the angle seat valve 11, a power assembly 16 for providing power for controlling the switch of the angle seat valve 11 is detachably mounted on the variable force speed housing 13, and a controller mounting housing 17 is arranged on the power assembly 16; two meshing gears 21 meshing with each other are rotatably connected in the variable force speed housing 13, a hole is opened at the center position of the meshing gear 21, and a connecting assembly for detachably connecting the meshing gear 21 to the rotating rod on the angle seat valve 11 or the motor output shaft is arranged in the hole; the control The controller mounting shell 17 is detachably mounted on the power assembly 16, a programmable logic controller 27 is mounted on the controller mounting shell 17 and is electrically connected to the motor in the power assembly 16, a plurality of pressure detectors 28 are mounted on the fluid pipeline 12 located before and after the angle seat valve 11, a plurality of circumferentially distributed mounting strips 14 are fixedly connected to one end of the variable force shift housing 13 close to the angle seat valve 11, the mounting strips 14 are in a "7" shape, and one end thereof is bent away from the variable force shift housing 13, and the distance between the plurality of mounting strips 14 gradually decreases from the direction away from the variable force shift housing 13, and the plurality of mounting strips 14 are bent. One end of the variable force speed change housing 13 clamps the upper part of the angle seat valve 11, and a plurality of circumferentially distributed connecting strips 15 are fixedly connected to the outer peripheral wall of the variable force speed change housing 13, and the connecting strips 15 extend upward to the side position of the power component 16. The connecting strips 15 are provided with screws that pass through the connecting strips 15 and are threadedly connected to the side wall of the power component 16, and a variable force speed change cavity 19 is opened in the variable force speed change housing 13, and the upper and lower walls of the variable force speed change cavity 19 are respectively fixedly connected with a connecting tube 20, and the end of the connecting tube 20 away from the inner wall of the variable force speed change cavity 19 is respectively rotatably connected with a meshing gear 21, and the connecting assembly includes a connecting block 24 and a control screw 25, the side wall of the hole of the meshing gear 21 is provided with a plurality of sliding grooves 22 penetrating up and down, the connecting block 24 slides in the sliding groove 22 in a direction perpendicular to the axis of the meshing gear 21, the connecting block 24 is rotatably connected to one end of the gear close to the meshing gear 21 with a control screw 25 extending to the outside of the gear on the side of the meshing gear 21, and the control screw 25 is threadedly connected to the meshing gear 21, the rotating rod on the angle seat valve 11 or the motor output shaft is provided with a groove for inserting the connecting block 24, the cross section of the mounting bar 14 is flat and can be elastically deformed along the diameter direction of the circumferential array of the plurality of mounting bars 14.

[0032] The programmable logic controller 27 includes a data conversion module that converts the signal of the pressure sensor into a numerical value; a data screening module that receives the data conversion module within a unit time and converts the signal of the pressure sensor into numerical data and arranges the data from small to large by a bubbling arrangement method; a logic calculation module that receives several groups of data output by the data screening module within a unit time and calculates the several groups of data into a stable average value, and the calculation formula is: M: stable average value; n: data transformation module per unit time, and the number of n is greater than or equal to 4 and is an integer multiple of 4; Arrange the data entered in a unit time from small to large. The value of the bit is deduced by analogy for the remaining values ​​of a; an output electrical signal module that receives the control value output by the data change module and controls the operation of the motor, wherein the control value is obtained by converting the above-mentioned stable average value M by the data conversion module.

[0033] Adjustment module, input module and feedback adjustment module. The input module includes several buttons, display screen and data import block, and is debugged through the following steps:

[0034] S1: First, the controller enters the adjustment module mode by pressing a number of buttons, and then the liquid is circulated in the fluid pipeline 12 according to the working pressure, and the motor is controlled by the output electrical signal module to drive the valve to reciprocate from fully open to fully closed, and the stable average value P detected by the pressure detector 28 at the downstream position of the angle seat valve 11 detected in the process is A , the stable average value P detected by the pressure detector 28 at the upstream position of the angle seat valve 11 B Import into the adjustment module about P A and P B In the database, use the following formula to calculate the corresponding θ value; P A : The stable average value converted from the maximum pressure in the pipeline; P B : The stable average value detected by the pressure detector 28 at the downstream position of the angle seat valve 11; π: Pi; r: The radius of the valve core in the angle seat valve 11 for blocking the channel in the angle seat valve 11; θ: The angle between the valve core plane of the angle seat valve 11 and the pipeline axis; Where P A , r are input into the adjustment module through several buttons; and the corresponding θ value is compared with P B Value association;

[0035] S2.1: Compare the obtained θ value with P B The value-related data relationship is imported into the output electrical signal module, and the stable average value P detected by the pressure detector 28 at the downstream position of the angle seat valve 11 is received. B Control the motor rotation position;

[0036] S2.2: Corresponding θ value and P B The stable average value P detected by the pressure detector 28 at the downstream position of the angle seat valve 11 synchronously detected C Synchronously perform data association; the adjustment module is set in the output electrical signal module;

[0037] S3: Input the stable average value detected by the pressure detector 28 at the downstream position of the angle seat valve 11 to the adjustment module through a number of buttons and a data import block, and compare the stable average value detected by the pressure detector 28 at the downstream position of the angle seat valve 11 with the P value every 0.5 seconds during the operation. B The motor rotation angle is adjusted based on the value of θ plus or minus α.

[0038] S4: In the actual working process, the output electrical signal module receives the stable average value detected by the pressure detector 28 at the downstream position of the angle seat valve 11, and compares it with the stable average value detected by the pressure detector 28 at the corresponding downstream position. If there is a difference, the corresponding P is adjusted up or down by one unit. A And the P A The value is updated in the adjustment module;

[0039] S5: When the difference between the stable average value detected by the pressure detector 28 at the downstream position of the accumulative angle seat valve 11 and the stable average value detected by the pressure detector 28 at the corresponding downstream position reaches P A When the error is more than 5%, the display shows red light and prompts the operator to re-calibrate.

[0040] The pressure detector 28 detects and transmits data every 0.05 seconds. At the same time, 2 seconds is a group of data detection units, and a total of 20 data are detected. The stable average value detected by the pressure detector 28 at the downstream position of the angle seat valve 11 with standard settings can be within the range of interval values, and the output pressure is controlled to change periodically within this range.

[0041] The power assembly 16 includes a housing and a motor, and the motor is connected to the programmable logic controller 27 by telecommunication. When it is necessary to improve the existing valve into an automated valve, a motor (i.e., the power assembly 16) with suitable torque and size is selected, and then two meshing gears 21 (i.e., different types of variable force transmission housings 13) with different sizes and numbers of teeth are selected according to the actual rotation angle and torque required for opening and closing the valve. The two meshing gears 21 of different types have different sizes and numbers of teeth, resulting in different transmission ratios in the variable force transmission housings 13 of different types. Then, a groove is opened on the rotating rod of the existing valve, and one of the meshing gears 21 is sleeved on the rotating rod, and the control screw 25 is rotated. The control screw 25 is threadedly connected to the threaded hole 23 on the meshing gear 21 and pushes the connecting block 24 to move along the inner wall of the sliding groove 22, thereby causing the connecting block 24 to be stuck in the groove on the rotating rod. Similarly, another meshing gear 21 is sleeved on the output shaft of the motor on the power assembly 16, and a groove is opened on it. The connection of the other meshing gear 21 with the output shaft of the motor is completed in the same way. The top wall of the variable speed chamber 19 is an openable cover. When the meshing gear 21 is installed on the rotating rod, the meshing gear 21 and the angle seat valve 11 are respectively located on the two sides of the variable speed housing 13. At this time, the rotating rod is inserted into the variable speed chamber 19 through the lower through hole 18 opened on the top wall of the variable speed chamber 19, and the meshing gear 21 is located in the variable speed chamber 19. Then the cover is closed. At this time, the meshing gear 21 at this position is buckled into the connecting cylinder 20 on the cover to complete the connection and increase its stability. When connecting the motor output When the meshing gear 21 on the shaft is engaged, the cover is not closed yet, that is, the meshing gear 21 and the power assembly 16 are respectively located at the two sides of the cover, and the motor output shaft on the power assembly 16 passes through the upper through hole 26. As the cover is engaged with the top surface of the variable force and speed change housing 13, the meshing gear 21 and the connecting cylinder 20 are engaged, thereby completing the preliminary installation of the present invention. When engaging, ensure that the power assembly 16 is located in the middle of the circular array of the plurality of connecting strips 15, and then rotate the screw to complete the connection between the variable force and speed change housing 13 and the power assembly 16;The variable force speed change housing 13 is installed on the angle seat valve 11 through the mounting strip 14 below it. Specifically, a plurality of mounting strips 14 are first opened and wrapped around the larger upper part of the angle seat valve 11, and the mounting strips 14 are aligned with the mounting screw holes on the angle seat valve 11, and the longer nuts are replaced, and then tightened and fixed. Through this installation method, and because of its relatively independent characteristics, each part of the present invention can be replaced and repaired when a failure occurs. In large-scale applications, for different fluid environments and types of valves, more types of variable force speed change housings 13, meshing gears 21, power components 16 and programmable logic controllers 27 are required. Therefore, when replacing and repairing parts, they can be directly replaced, and can even be further improved according to actual usage. The price of this installation method and maintenance method is relatively mature. The integrated automatic valve cost disclosure reduces the requirements for both buyers and sellers, greatly promoting the progress of updating and repairing old equipment. At the same time, it can also be directly remedied when the valve installation design of some production lines is wrong, and the equipment cannot be directly replaced because it is running, further increasing the use effect of the present invention;

[0042] On the one hand, the controller mounting shell 17 can be directly mounted on the outer shell of the power assembly 16 by means of nuts or the like, and the valve can be adjusted directly on the pipeline valve. On the other hand, the programmable logic controller 27 can also be installed and placed in a control room for unified scheduling, and the programmable logic controller 27 can be connected to the motor in the power assembly 16 and the pressure detector 28 on the fluid pipeline 12 through a signal line to achieve integrated control (if the present invention needs to be introduced into the automation control system of equipment and assembly lines, an external signal converter can be installed to complete the connection between the present invention and the automation control system);

[0043] In addition, during use, the pressure values ​​in the fluid pipeline 12 detected by the pressure detectors 28 are analyzed and calculated by the data screening module (using an empirical formula, which is the result of actual application adjustment) to obtain accurate and stable values, and then the relationship between the corresponding output pressure value and the motor rotation angle is detected by data calculation, and adjusted in real time, so that the output pressure is still stable under different output pressures, further increasing the output pressure control effect of the present invention, and at the same time, by setting the output pressure interval range, the output pressure value can be further pulsed, further increasing the use effect;

[0044] Furthermore, the corresponding programmable logic controller 27 can be replaced, and controllers with other effects and control logic and methods can be used to achieve different effects of the valve, which greatly increases the use range of the original valve and increases the use effect;

[0045] The programmable logic controller 27 is preferably a Siemens S7-200 series.

[0046] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An external valve control device, comprising an angle seat valve (11) connected to a fluid pipeline (12), characterized in that: A variable force speed housing (13) connected to a rotating rod on the angle seat valve (11) is detachably mounted on the angle seat valve (11); a power assembly (16) for providing power for controlling the switch of the angle seat valve (11) is detachably mounted on the variable force speed housing (13); a controller mounting housing (17) is provided on the power assembly (16); Two meshing gears (21) are rotatably connected in the variable speed housing (13), a hole is provided at the center of the meshing gear (21), and a connecting assembly is provided in the hole for detachably connecting the meshing gear (21) to a rotating rod on the angle seat valve (11) or a motor output shaft; The controller mounting shell (17) is detachably mounted on the power assembly (16); a programmable logic controller (27) is mounted on the controller mounting shell (17) and is electrically connected to the motor in the power assembly (16); and a plurality of pressure detectors (28) are mounted on the fluid pipeline (12) located before and after the angle seat valve (11).

2. A pressure control system, characterized in that: It comprises an external valve control device as claimed in claim 1, wherein the programmable logic controller (27) comprises a data conversion module for converting a signal of a pressure sensor into a numerical value; A data screening module that receives the data conversion module within a unit time and converts the signal of the pressure sensor into numerical data and arranges the data from small to large using a bubble arrangement method; The logic calculation module receives several groups of data output by the data screening module within a unit time and calculates the several groups of data into a stable average value. The calculation formula is: M: stable mean value; n: data transformation module per unit time, and the number of n is greater than or equal to 4 and is an integer multiple of 4; Arrange the data entered in a unit time from small to large. The place value, and so on for the rest of the a values; An output electrical signal module that receives the control value output by the data change module and controls the operation of the motor, wherein the control value is obtained by converting the above-mentioned stable average value M by the data conversion module.

3. A pressure control system according to claim 2, characterized in that: It also includes an adjustment module, an input module and a feedback adjustment module. The input module includes several buttons, a display screen and a data import block, and is debugged through the following steps: S1: First, the controller enters the adjustment module mode by pressing a number of buttons, and then the liquid is circulated in the fluid pipeline (12) according to the working pressure, and the motor is controlled by the output electrical signal module to drive the valve to reciprocate from fully open to fully closed, and the stable average value P detected by the pressure detector (28) at the downstream position of the angle seat valve (11) detected in the process is A , the stable average value P detected by the pressure detector (28) at the upstream position of the angle seat valve (11) B Import into the adjustment module about P A and P B In the database, use the following formula to calculate the corresponding θ value; P A : The stable average value converted from the maximum pressure in the pipeline; P B : The stable average value detected by the pressure detector (28) at the downstream position of the angle seat valve (11); π: pi; r: the radius of the valve core in the angle seat valve (11) for blocking the inner passage of the angle seat valve (11); θ: the angle between the valve core plane of the angle seat valve (11) and the pipeline axis; Where P A , r are input into the adjustment module through several buttons; and the corresponding θ value is compared with P B Value association; S2.1: Compare the obtained θ value with P B The value-related data relationship is imported into the output electrical signal module, and the stable average value P detected by the pressure detector (28) at the downstream position of the angle seat valve (11) is received. B Control the motor rotation position; S2.2: Corresponding θ value and P B The stable average value P detected by the pressure detector (28) at the downstream position of the angle seat valve (11) synchronously detected C Data association is performed synchronously.

4. A pressure control system according to claim 3, characterized in that: The adjustment module is arranged in the output electrical signal module, and further comprises the following steps: S3: Input the stable average value detected by the pressure detector (28) at the downstream position of the angle seat valve (11) to the adjustment module through a plurality of buttons and a data import block, and compare the stable average value detected by the pressure detector (28) at the downstream position of the angle seat valve (11) with the pressure value P every 0.5 seconds during the operation. B The motor rotation angle is adjusted based on the value of θ plus or minus α.

5. An external valve control device according to claim 4, characterized in that: The following steps are also included: S4: In the actual working process, the output electrical signal module receives the stable average value detected by the pressure detector (28) at the downstream position of the angle seat valve (11), and compares it with the stable average value detected by the pressure detector (28) at the corresponding downstream position. If there is a difference, the P value is adjusted upward or downward by one unit. A And the P A The value is updated in the adjustment module; S5: When the difference between the stable average value detected by the pressure detector (28) at the downstream position of the accumulating angle seat valve (11) and the stable average value detected by the pressure detector (28) at the corresponding downstream position reaches P A When the error is more than 5%, the display shows red light and prompts the operator to re-calibrate.

6. The external valve control device according to claim 1, characterized in that: One end of the variable force speed change housing (13) close to the angle seat valve (11) is fixedly connected to a plurality of circumferentially distributed mounting strips (14); the mounting strips (14) are in a "7" shape, and one of the bent ends is away from the variable force speed change housing (13); and the distance between the plurality of mounting strips (14) gradually decreases in a direction away from the variable force speed change housing (13); and the bent ends of the plurality of mounting strips (14) clamp the upper portion of the angle seat valve (11).

7. The external valve control device according to claim 1, characterized in that: A plurality of circumferentially distributed connecting strips (15) are fixedly connected to the outer peripheral wall of the variable speed housing (13), and the connecting strips (15) extend upward to the side position of the power assembly (16). The connecting strips (15) are provided with screws that pass through the connecting strips (15) and are threadedly connected to the side wall of the power assembly (16). A variable speed chamber (19) is provided in the variable speed housing (13), and a connecting tube (20) is fixedly connected to the upper and lower walls of the variable speed chamber (19), and one end of the connecting tube (20) away from the inner wall of the variable speed chamber (19) is rotationally connected to a meshing gear (21).

8. An external valve control device according to claim 7, characterized in that: The connecting assembly comprises a connecting block (24) and a control screw (25). The side wall of the hole of the meshing gear (21) is provided with a plurality of sliding grooves (22) penetrating upward and downward. The connecting block (24) slides in the sliding groove (22) in a direction perpendicular to the axis of the meshing gear (21). One end of the connecting block (24) close to the meshing gear (21) is rotatably connected to a control screw (25) extending outside the side gear of the meshing gear (21), and the control screw (25) is threadedly connected to the meshing gear (21). A groove for inserting the connecting block (24) is provided on the rotating rod or the motor output shaft on the angle seat valve (11).

9. The external valve control device according to claim 6, characterized in that: The installation strip (14) has a flat cross section and can be elastically deformed along the diameter direction of a circumferential array of a plurality of installation strips (14).

10. The external valve control device according to claim 5, characterized in that: The pressure detector (28) detects data once every 0.05 seconds and transmits the data. At the same time, 2 seconds is a group of data detection units, and a total of 20 data are detected. The stable average value detected by the pressure detector (28) at the downstream position of the angle seat valve (11) with standard settings can be within the range of interval values, and the output pressure is controlled to change periodically within this range.

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