Servo control system suitable for adjusting steam valve

Abstract

The utility model provides a servo control system suitable for adjusting a steam valve. The servo control system comprises a servo module; the flow control type servo valve is in communication connection with the servo module; a barrel cavity of an oil cylinder barrel body is divided into an oil cylinder upper cavity and an oil cylinder lower cavity by an oil cylinder piston, and the oil cylinder upper cavity and the oil cylinder lower cavity are respectively communicated with a flow control type servo valve through oil ways; the displacement sensor is located on one side of the oil cylinder barrel to collect the displacement variation of the oil cylinder piston rod; the pilot valve comprises a sleeve, a sliding valve arranged in the sleeve in a sliding mode and a sliding valve reset piece enabling the sliding valve to return to the original position, and the sliding valve is connected or connected to the oil cylinder piston rod in an abutting mode so as to be driven by the oil cylinder piston rod; an adjusting type hydraulic servo-motor of the low-pressure oil system is in transmission connection with an adjusting steam valve, and an oil way of the adjusting type hydraulic servo-motor is communicated with a pilot valve. The hydraulic control system is higher in control precision, lower in energy consumption, lower in requirement for oil supply equipment and simpler in debugging operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic transmission technical field, in particular to a kind of servo control system suitable for adjusting steam valve. BACKGROUND

[0002] The regulating type oil motor of current low-pressure oil system is usually controlled valve opening degree by mechanical oil pressure type electro-hydraulic transducer.The torque motor on electro-hydraulic transducer receives 0-300mA range control current, generates an electromagnetic force, is transmitted to pressure oil inlet drain valve port by mechanical lever action, changes the opening of drain valve port by changing control current, changes the numerical value of output oil pressure, and the oil pressure (secondary oil pressure) is acted on the upper cavity of relay piston, drives the displacement change of relay piston, further drives the displacement of oil cock, changes the inlet and return oil passage of oil cylinder, realizes the valve position control of oil motor.

[0003] However, the servo valve of high-pressure oil system is not used to realize the valve position control of low-pressure oil regulating type oil motor at present. CONTENT OF UTILITY MODEL

[0004] In view of the above-mentioned defects of prior art, the technical problem to be solved by the utility model is to provide a kind of servo control system suitable for adjusting steam valve, and the control precision is higher, energy consumption is lower, the requirement to oil supply equipment is lower, and debugging operation is simpler.

[0005] In order to solve the above technical problem, the utility model provides a kind of servo control system suitable for adjusting steam valve, comprising:

[0006] Servo module;

[0007] Flow control type servo valve, flow control type servo valve communication connection is in servo module;

[0008] Double-sided oil cylinder, double-sided oil cylinder includes oil cylinder barrel, oil cylinder piston, oil cylinder piston rod and oil cylinder reset piece that are arranged in oil cylinder barrel, oil cylinder piston rod and oil cylinder reset piece are arranged in oil cylinder piston and are arranged in oil cylinder barrel, and oil cylinder piston restores original position, oil cylinder piston separates the barrel cavity of oil cylinder barrel into oil cylinder upper cavity and oil cylinder lower cavity, and oil cylinder upper cavity and oil cylinder lower cavity are communicated with flow control type servo valve respectively by oil circuit;

[0009] Displacement sensor, displacement sensor communication connection is in servo module, and displacement sensor is located in one side of oil cylinder barrel to gather the displacement change amount of oil cylinder piston rod;

[0010] Oil cock, oil cock includes sleeve, slide valve and slide valve reset piece that are arranged in sleeve, and slide valve reset piece restores original position, and slide valve is connected or abuts on oil cylinder piston rod to be driven by oil cylinder piston rod;

[0011] The regulating oil motor of the low-pressure oil system is in transmission connection with a regulating valve, and an oil passage of the regulating oil motor is communicated with the oil distribution valve;

[0012] When the oil cylinder piston of the double-sided oil cylinder moves linearly, the spool moves with the oil cylinder piston rod to control the oil inlet opening and the oil return opening of the oil distribution valve, and the regulating oil motor adjusts the regulating valve to a preset opening degree.

[0013] Preferably, the servo control system suitable for the regulating valve further comprises a hydraulic pipeline system, the hydraulic pipeline system comprising an oil inlet pipeline and an oil return pipeline, the oil inlet pipeline being respectively communicated with the flow control servo valve and the oil distribution valve, and the oil return pipeline being respectively communicated with the flow control servo valve and the oil distribution valve.

[0014] Preferably, the hydraulic pipeline system further comprises a pressure oil main pipe, one end of the pressure oil main pipe being communicated with the oil inlet pipeline.

[0015] Preferably, the flow control servo valve has an A oil port, a B oil port, a P oil port and a T oil port, the A oil port being communicated with the upper chamber of the oil cylinder, the B oil port being communicated with the lower chamber of the oil cylinder, the P oil port being communicated with the oil inlet pipeline, and the T oil port being communicated with the oil return pipeline.

[0016] Preferably, the regulating oil motor comprises an oil motor valve body, an oil motor piston slidably arranged in the oil motor valve body, an oil motor piston rod arranged on the oil motor piston, and a lever assembly driven by the oil motor piston rod, an oil passage of the oil motor valve body being communicated with a sleeve of the oil distribution valve, and the lever assembly being in transmission connection with the regulating valve.

[0017] As described above, the servo control system suitable for the regulating valve has the following beneficial effects: the flow control servo valve used in the high-pressure oil system is applied to the regulating oil motor of the low-pressure oil system, and the flow control servo valve directly outputs flow to control the control mode of the double-sided oil cylinder stroke. The double-sided oil cylinder with servo valve driving and piston displacement feedback is used as a control pilot stage to drive the oil distribution valve to move, and replaces the original mechanical oil pressure type electro-hydraulic converter. Based on this, the servo control system suitable for the regulating valve has the following technical effects: first, the control accuracy, linearity and rapid response capability of the flow control servo valve are better than those of the electro-hydraulic converter, and the price is lower; the driving current of the flow control servo valve is small, and no additional power supply is needed, so the energy consumption is low; the flow control servo valve itself has low oil consumption, which can greatly reduce the flow demand of the system, and reduce the displacement of the oil pump and the power of the motor. Second, the regulating oil motor with the flow control servo valve as the pilot stage is simple to debug and operate, and is not affected by the medium oil temperature and viscosity. Therefore, compared with the existing control system using the electro-hydraulic converter, the servo control system suitable for the regulating valve has higher control accuracy, lower energy consumption, lower requirement for oil supply equipment, and simpler debugging operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The diagram shown is a schematic of the servo control system of this utility model applicable to regulating steam valves.

[0019] Component designation explanation

[0020] 1 Servo Module

[0021] 2. Flow control type servo valve

[0022] 3. Double-sided hydraulic cylinders

[0023] 31. Hydraulic cylinder body

[0024] 32 Hydraulic cylinder piston

[0025] 33. Hydraulic cylinder piston rod

[0026] 34 Hydraulic Cylinder Reset Part

[0027] 35 Upper chamber of hydraulic cylinder

[0028] 36 Lower chamber of hydraulic cylinder

[0029] 4 Displacement Sensors

[0030] 5. Misjudging the throttle

[0031] 51 Sleeve

[0032] 52 Spool valve

[0033] 53. Spool valve reset component

[0034] 6. Adjustable hydraulic actuator

[0035] 61 Hydraulic actuator valve body

[0036] 62 Hydraulic actuator piston

[0037] 63. Hydraulic actuator piston rod

[0038] 64 Lever Components

[0039] 7. Adjusting steam valve

[0040] 8. Pressure oil header Detailed Implementation

[0041] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0042] It is to be understood that the structures, proportions, sizes and the like shown in the drawings of the present specification are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and are not used to limit the implementation of the present application. Therefore, any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technical content. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship is also considered as the implementation of the present application without changing the technical content.

[0043] As shown in the drawings, the present application provides a servo control system suitable for adjusting the valve, comprising: Figure 1

[0044] Servo module 1;

[0045] Flow control type servo valve 2, flow control type servo valve 2 is connected to servo module 1;

[0046] Double-sided oil cylinder 3, double-sided oil cylinder 3 includes oil cylinder barrel 31, oil cylinder piston 32 slidingly arranged in oil cylinder barrel 31, oil cylinder piston rod 33 arranged on oil cylinder piston 32 and penetrating oil cylinder barrel 31, and oil cylinder reset member 34 for restoring oil cylinder piston 32 to its original position. Oil cylinder piston 32 separates the barrel cavity of oil cylinder barrel 31 into oil cylinder upper cavity 35 and oil cylinder lower cavity 36. Oil cylinder upper cavity 35 and oil cylinder lower cavity 36 are respectively connected to flow control type servo valve 2 through oil circuit;

[0047] Displacement sensor 4, displacement sensor 4 is connected to servo module 1, and displacement sensor 4 is located on one side of oil cylinder barrel 31 to collect the displacement change of oil cylinder piston rod 33;

[0048] Mist throttle 5, mist throttle 5 includes sleeve 51, slide valve 52 slidingly arranged in sleeve 51, and slide valve reset member 53 for restoring slide valve 52 to its original position. Slide valve 52 is connected or abuts oil cylinder piston rod 33 to be driven by oil cylinder piston rod 33;

[0049] Adjustable oil motor 6 of low pressure oil system, adjustable oil motor 6 is drivingly connected to an adjustable valve 7, and adjustable oil motor 6 is connected to mist throttle 5 through oil circuit;

[0050] When oil cylinder piston 32 of double-sided oil cylinder 3 moves linearly, slide valve 52 moves with oil cylinder piston rod 33 to control the oil inlet opening and oil return opening of the above-mentioned mist throttle 5, and adjustable oil motor 6 adjusts the above-mentioned adjustable valve 7 to the preset opening degree. ​

[0051] In the utility model, the servo module 1 is the existing structure, and the structure will not be repeated. The servo module 1 has corresponding servo control card, and can form a complete closed-loop control system. The servo module 1 is used to send drive signal to flow control type servo valve 2, and is used to receive feedback signal fed back by displacement sensor 4. Flow control type servo valve 2 is originally used for high pressure oil system (14~16MPa), and the flow control type servo valve 2 is applied to the regulating type oil cylinder 6 of low pressure oil system in the application. The pressure of low pressure oil system is 1.2~2MPa, and the working medium is 32#, 46# turbine hydraulic oil, and the working oil temperature is 40~60 DEG C. The main innovation points of the servo control system of the application are as follows:

[0052] The servo module 1 sends a drive signal to the flow control type servo valve 2, and the flow control type servo valve 2 adjusts the oil inlet amount or oil return amount in the upper cavity 35 and the lower cavity 36 of the oil cylinder, so that the oil cylinder piston 32 moves linearly towards the preset direction. Since the oil cylinder piston rod 33 and the oil cylinder piston 32 are fixedly connected, the oil cylinder piston rod 33 moves synchronously with the oil cylinder piston 32. The displacement sensor 4 collects the displacement change of the oil cylinder piston rod 33 in real time, and feeds back the displacement change to the servo module 1 in real time, forms a servo closed loop with the drive signal, verifies the movement accuracy of the oil cylinder piston 32, so that the displacement change of the oil cylinder piston 32 can be accurately controlled. At the same time, since the slide valve 52 of the oil gate 5 is connected or abuts against the oil cylinder piston rod 33, the slide valve 52 can be driven by the oil cylinder piston rod 33, so as to control the oil inlet opening and oil return opening of the oil gate 5. In this way, the double-sided oil cylinder 3 can be used as a pilot stage to control the oil inlet and oil return channel of the oil gate 5, replacing the original low pressure oil system structure that the mechanical hydraulic type electro-hydraulic converter drives the existing oil cylinder piston: the electro-hydraulic converter drives the relay piston, further drives the displacement of the oil gate 5, changes the oil inlet and return channel of the oil cylinder, and then realizes the valve position control of the regulating type oil cylinder 6 of the low pressure oil system, so as to realize the opening control of the regulating steam valve 7.

[0053] Briefly, the control of the servo control system is divided into two levels. The first level is composed of flow control type servo valve 2, double-sided oil cylinder 3, displacement sensor 4 and servo control card, and the controlled object is the displacement of the oil cylinder piston 32. The second level is composed of oil gate 5 and valve position mechanical feedback of regulating type oil cylinder 6, and the controlled object is the execution element of the regulating type oil cylinder 6.

[0054] Specifically, the double-sided oil cylinder 3 is installed and fixed on the oil gate 5, and the oil cylinder piston rod 33 of the double-sided oil cylinder 3 is connected downward to the slide valve 52 of the oil gate 5. Through servo instruction, the slide valve 52 is driven to move, the oil inlet and return channel of the regulating type oil cylinder 6 is changed, and the stroke of the regulating type oil cylinder 6 is adjusted.

[0055] In addition, the stroke data of the ascending and descending of the actuator of the regulating oil motor 6 can be recorded by gradually increasing and then decreasing the servo command of the servo module 1, and the retardation rate of the stroke of the regulating oil motor 6 can be obtained, which needs to be less than 2%.

[0056] The flow control type servo valve for the high-pressure oil system directly outputs the flow to control the control mode of the stroke of the double-sided oil cylinder 3, and is applied to the regulating oil motor 6 of the low-pressure oil system. The double-sided oil cylinder 3 driven by the servo valve and fed back by the piston displacement is used as the control pilot stage for driving the oil door to move, and replaces the original mechanical oil pressure type electro-hydraulic converter. Based on this, the servo control system suitable for the regulating valve has the following technical effects:

[0057] Firstly, the control accuracy, linearity and rapid response capability of the flow control type servo valve 2 are better than those of the electro-hydraulic converter, and the price is lower; the driving current of the flow control type servo valve 2 is small, and no additional power supply is needed, so that the energy consumption is low; the oil consumption of the flow control type servo valve 2 itself is low, so that the flow demand of the system can be greatly reduced, and the displacement of the oil pump and the power of the motor can be reduced.

[0058] Secondly, the regulating oil motor 6 configured with the flow control type servo valve as the pilot stage is simple to debug and operate, and is not affected by the medium oil temperature and viscosity.

[0059] Therefore, compared with the existing control system using the electro-hydraulic converter, the servo control system suitable for the regulating valve has higher control accuracy, lower energy consumption, lower requirement for oil supply equipment, and simpler debugging operation.

[0060] In order to control the double-sided oil cylinder 3 and the regulating oil motor 6, the above-mentioned servo control system suitable for the regulating valve further comprises a hydraulic pipeline system, and the hydraulic pipeline system comprises an oil inlet pipeline and an oil return pipeline.

[0061] Further, the above-mentioned hydraulic pipeline system further comprises a pressure oil main pipe 8, one end of the pressure oil main pipe 8 being communicated with the oil inlet pipeline.

[0062] After the flow control type servo valve 2 is selected, the oil passage block corresponding to the flow control type servo valve 2 needs to be designed, the flow control type servo valve 2 is installed on the oil passage block, and the P, T, A and B four oil ports of the flow control type servo valve 2 are connected to the external interface in the form of a pipe joint.

[0063] In order to control the up and down movement of the oil cylinder piston 32 in the oil cylinder barrel 31, the flow control type servo valve 2 has an A oil port, a B oil port, a P oil port and a T oil port, the A oil port is communicated with the oil cylinder upper chamber 35, the B oil port is communicated with the oil cylinder lower chamber 36, the P oil port is communicated with the oil inlet pipeline, and the T oil port is communicated with the oil return pipeline.

[0064] Specifically, the flow control type servo valve 2 receives a control current of ±20mA, and the oil inlet chamber P oil port thereof receives a system oil pressure of 1.2-2MPa. The displacement variation of the oil cylinder piston 32 in the double-sided oil cylinder 3 controls the oil inlet and return opening of the oil valve, so that the regulating type oil actuator 6 is adjusted to the opening or closing direction.

[0065] When the flow control type servo valve 2 loses power due to system failure, since the mechanical valve core inside is biased, the A oil port is communicated with the oil return pipeline, the B oil port is communicated with the oil inlet pipeline, the double-sided oil cylinder 3 is reset to the closed position, and the regulating type oil actuator 6 is kept in the safe closed position.

[0066] In order to adjust the opening of the regulating steam valve 7, the regulating type oil actuator 6 includes an oil actuator valve body 61, an oil actuator piston 62 slidingly arranged in the oil actuator valve body 61, an oil actuator piston rod 63 arranged on the oil actuator piston 62, and a lever assembly 64 driven by the oil actuator piston rod 63, the oil actuator valve body 61 is communicated with the sleeve 51 of the oil valve 5, and the lever assembly 64 is drivingly connected to the regulating steam valve 7.

[0067] In summary, the servo control system for the regulating steam valve has higher control precision, lower energy consumption, lower requirement for oil supply equipment, and simpler debugging operation. Therefore, the servo control system for the regulating steam valve effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0068] The above embodiments only exemplarily illustrate the principles and effects of the servo control system for the regulating steam valve, and are not used to limit the servo control system for the regulating steam valve. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the servo control system for the regulating steam valve. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the servo control system for the regulating steam valve should be covered by the claims of the servo control system for the regulating steam valve.

Claims

1. A servo-operated system suitable for regulating a steam valve, characterized in that, The servo control system for regulating valve comprises a servo module (1), a flow control servo valve (2) connected to the servo module (1), a double-sided oil cylinder (3) comprising a cylinder barrel (31), an oil cylinder piston (32) slidingly arranged in the cylinder barrel (31), an oil cylinder piston rod (33) arranged on the oil cylinder piston (32) and penetrating the cylinder barrel (31), and an oil cylinder reset member (34) for restoring the oil cylinder piston (32) to its original position, wherein the oil cylinder piston (32) divides the cylinder barrel (31) into an upper oil chamber (35) and a lower oil chamber (36), and the upper oil chamber (35) and the lower oil chamber (36) are respectively connected to the flow control servo valve (2) through oil lines, a displacement sensor (4) connected to the servo module (1) and arranged on one side of the cylinder barrel (31) to collect the displacement change of the oil cylinder piston rod (33), a wrong oil gate (5) comprising a sleeve (51), a slide valve (52) slidingly arranged in the sleeve (51), and a slide valve reset member (53) for restoring the slide valve (52) to its original position, wherein the slide valve (52) is connected to or abuts against the oil cylinder piston rod (33) to be driven by the oil cylinder piston rod (33), and a regulating oil motor (6) of a low-pressure oil system, which is drivingly connected to a regulating valve (7) and connected to the wrong oil gate (5) through oil lines. When the oil cylinder piston (32) of the double-sided oil cylinder (3) moves linearly, the slide valve (52) moves with the oil cylinder piston rod (33) to control the oil inlet opening and the oil return opening of the wrong oil gate (5), and the regulating oil motor (6) adjusts the regulating valve (7) to a preset opening. The servo control system for regulating valve further comprises a hydraulic pipeline system, which comprises an oil inlet pipeline and an oil return pipeline, wherein the oil inlet pipeline is connected to the flow control servo valve (2) and the wrong oil gate (5), and the oil return pipeline is connected to the flow control servo valve (2) and the wrong oil gate (5). The hydraulic pipeline system further comprises a pressure oil main pipe (8) connected to the oil inlet pipeline at one end. The flow control servo valve (2) has an A oil port, a B oil port, a P oil port, and a T oil port, wherein the A oil port is connected to the upper oil chamber (35), the B oil port is connected to the lower oil chamber (36), the P oil port is connected to the oil inlet pipeline, and the T oil port is connected to the oil return pipeline. The regulating oil motor (6) comprises an oil motor valve body (61), an oil motor piston (62) slidingly arranged in the oil motor valve body (61), an oil motor piston rod (63) arranged on the oil motor piston (62), and a lever assembly (64) driven by the oil motor piston rod (63), wherein the oil motor valve body (61) is connected to the sleeve (51) of the wrong oil gate (5) through oil lines, and the lever assembly (64) is drivingly connected to the regulating valve (7). ​ ​ 2. A servo operated system suitable for regulating a steam valve as claimed in claim 1 wherein: ​ 3. A servo operated system suitable for regulating a steam valve as claimed in claim 2 wherein: ​ 4. A servo-operated system suitable for regulating a steam valve according to claim 1 or 2, characterized in that: ​ 5. A servo operated system suitable for regulating the steam valve as claimed in claim 1 wherein: ​

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