Displacement measuring device and method for straight-stroke intelligent valve positioner

Abstract

The invention relates to a displacement measuring device and method for a straight-stroke intelligent valve positioner. The device comprises a control module, a detection module and a movement module. The straight stroke magnetic strip is located above the straight stroke valve displacement module and is parallel to the screw rod. The detection module comprises a magnetizer and a magnetic detection device, and the detection module is kept fixed in the working process. Through the control module, movement of the straight stroke valve displacement module is controlled in the working process of the device, in the movement process of the straight stroke valve displacement module, a magnetizer in the detection module feeds back a magnetic signal to the control module, and the control module receives and feeds back the magnetic detection signal to the upper computer. And the upper computer is used for determining the displacement of the straight-stroke intelligent valve positioner based on the magnetic detection signal. According to the invention, an important detection part is provided for the accuracy of the position feedback of the valve of the non-contact straight-stroke intelligent positioner, the non-contact installation is convenient, and the reliability is high.

Description

Technical Field

[0001] The invention relates to the field of detection of position feedback components of valve positioners, and in particular to a displacement measurement device and method for a linear travel intelligent valve positioner. Background Art

[0002] Control valves are the terminal actuators of process control in process industries. Only when they are upgraded to intelligent field equipment can they be integrated into intelligent factories. The key is to configure and apply intelligent valve positioners. In this case, position feedback is an important indicator for controlling the operating accuracy of valves. Valve position feedback methods include contact valve position feedback and non-contact valve position feedback devices.

[0003] In the related technologies, contact valve position feedback devices are mostly used for positioning of intelligent valves. The technology of non-contact valve position feedback devices for intelligent valve positioning is still in the development stage. Position feedback is an important indicator for controlling the operating accuracy of valves. 98% of the world's intelligent valve positioners use precision potentiometers plus feedback levers.

[0004] Since the research on non-contact valve position feedback devices is still in the development stage, that is, in the measurement stage, R&D personnel cannot accurately know the displacement of the linear stroke intelligent valve positioner. Summary of the invention

[0005] The invention relates to a displacement measuring device for a linear stroke intelligent valve positioner, which can be used to accurately determine the displacement of the linear stroke intelligent valve positioner.

[0006] On the one hand, a displacement measuring device for a linear valve positioner is provided, the device comprising a control module, a detection module and a motion module; the control module is respectively connected to the motion module and the detection module for communication; The control module is used for data collection of the detection module and motion control of the motion module; The detection module is used to detect the magnetism of the magnetic conductor; the control module is also used to receive the feedback signal generated by the magnetic detection device of the detection module; The motion module includes a base, a motor, a screw, a linear valve displacement module and a linear magnetic strip; The motor and the screw are fixedly connected to the base, and the linear valve displacement module is sleeve-connected to the screw; The transmission shaft of the motor is connected to the screw; The linear magnetic strip is located above the linear valve displacement module, and the linear magnetic strip is parallel to the screw; The detection module includes a magnetic conductor, a magnetic detection device and a detection module bracket, and the detection module remains fixed during operation; The magnetic detection device is connected to the magnetic conductor, and is used to detect the magnetism of the magnetic conductor; the magnetic conductor is located on the side of the detection module bracket; The magnetic detection device is communicatively connected with the control module; An accommodation space is formed in the magnetic conductor, and the accommodation space is used to accommodate the magnetic detection device; When the linear intelligent valve positioner position feedback test device is in working state, the linear magnetic strip passes through the magnetic conductor; The control module is used to receive a feedback signal generated by a magnetic detection device.

[0007] In a possible implementation, the linear magnetic strip is an axisymmetric structure.

[0008] In a possible implementation, the linear magnetic strip includes two groups of magnet arrays; Each set of magnet arrays includes at least two magnets; Two groups of magnet arrays are axially symmetrically distributed on one side of the linear magnetic strip.

[0009] In a possible implementation, in the magnet array, the distances between two adjacent magnets are the same; or, The distance between two adjacent magnets increases; or, The distance between two adjacent magnets decreases.

[0010] In a possible implementation, the magnetic conductor includes a first magnetic portion and a second magnetic portion; the first magnetic portion and the second magnetic portion are integrally formed; The first magnetic part and the second magnetic part are both L-shaped, and the first magnetic part is connected to the second magnetic part to form an accommodating space in the magnetic conductor.

[0011] In a possible implementation manner, the first magnetic part and the second magnetic part are integrally formed.

[0012] In a possible implementation, the screw is provided with a screw fixing device; The screw fixing device is fixedly connected to the base; The screw rod fixture supports the screw rod.

[0013] In a possible implementation, the motor is implemented as a stepper motor; The motor is equipped with a motor fixing seat; The motor fixing seat is fixedly connected to the base; The motor fixing seat is provided with an opening, and the transmission shaft of the motor passes through the opening and is connected with the screw rod.

[0014] In a possible implementation, the detection module includes a module bracket; The magnetic conductor is located on the side of the detection module bracket.

[0015] The present invention also includes a host computer, which is communicatively connected with the control module; and is communicatively connected with the detection module and the motion module respectively through the control module.

[0016] On the other hand, a displacement measurement method for a linear intelligent valve positioner is provided. The method is applied to any of the displacement measurement devices for linear intelligent valve positioners as described above. The method comprises the following steps: Step S1: The equipment is started, and the detection module is started to enter the state to be detected; the control module sends a control signal to instruct the motor to move, the motor is started, and the screw is driven to move, so that the linear valve displacement module moves along the screw; Step S2: When the linear valve displacement module moves along the screw rod, the control module controls the motor to drive the linear valve displacement module to drive the linear magnetic strip to move; the linear magnetic strip passes through the magnetic conductor; Step S3: When the linear magnetic strip passes through the magnetic conductor, the magnetic detection device detects the magnetism of the magnetic conductor in real time, determines the specific value of the magnetic change to generate a magnetic detection signal, and the magnetic detection device generates the magnetic detection signal based on the specific value of the magnetic change and feeds back the magnetic detection signal to the control module; Step S4, the control module receives and feeds back the magnetic detection signal to the upper computer, and the upper computer is used to determine the displacement of the linear travel intelligent valve positioner based on the magnetic detection signal.

[0017] The beneficial effects brought about by the technical solution provided by the present invention include at least: The control module is used to control the movement of the linear valve displacement module during the operation of the device. During the movement of the linear valve displacement module, the magnetic detection device in the detection module will feed back the magnetic signal to the control module. After receiving the feedback signal, the control module can accurately determine the specific displacement of the linear valve displacement module based on the magnetic change indicated in the feedback signal. The present invention provides an important detection component for the accuracy of valve position feedback of a non-contact linear intelligent positioner, and the non-contact installation is convenient and the reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1A schematic diagram of the structure of a position feedback test device for a linear intelligent valve positioner provided in the present application is shown.

[0020] Figure 2 A schematic structural diagram of a motion module provided by the present application is shown.

[0021] Figure 3 A schematic diagram of the structure of a motion module and a detection module provided by the present application in a working state is shown.

[0022] Figure 4 A schematic structural diagram of a built-in circuit of a magnetic detection device provided by the present application is shown.

[0023] Figure 5 A schematic structural diagram of a linear magnetic strip provided by the present application is shown.

[0024] Figure 6 A schematic diagram of the architecture of another linear travel intelligent valve positioner position feedback device provided by the present application is shown.

[0025] Figure 7 A schematic flow chart of a displacement measurement method for a linear travel intelligent valve positioner provided by an exemplary embodiment of the present application is shown.

[0026] The markings in the accompanying drawings are as follows: 1-control module, 2-detection module, 3-motion module, 4-host computer; 21-magnetic detection device, 22-magnetic conductor, 23-module bracket; 211-amplifier circuit, 212-reference voltage circuit; 221-first magnetic part, 222-second magnetic part; 31-base, 32-motor, 33-screw, 34-linear valve displacement module, 35-linear magnetic strip, 36-motor fixing seat; 351-magnet array, 3511-magnet, 352-mounting hole. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Figure 1 FIG. 1 is a schematic diagram showing the structure of a linear travel intelligent valve positioner position feedback test device provided by an exemplary embodiment of the present application. Please refer to FIG. Figure 1, the device includes a control module 1, a detection module 2 and a motion module 3. Among them, the control module 1 is communicatively connected with the detection module 2 and the motion module respectively. The control module 1 can be implemented as data acquisition for the detection module and motion control for the motion module. In actual application, the motion module 3 is implemented as a module formed by a combination of devices that control the valve opening through linear motion. In some embodiments of the present application, the control module 1 can be implemented as a CPU. In other embodiments of the present application, the control module 1 is implemented as a central control processing chip. The present application does not limit the specific implementation form of the control module 1.

[0029] Next, combine Figure 2 as well as Figure 3 , the structures of the motion module and the detection module involved in the embodiments of the present application are described: Please refer to Figure 2 The motion module 3 includes a base 31, a motor 32, a screw 33, a linear valve displacement module 34 and a linear magnetic strip 35; the motor 32 and the screw 33 are fixedly connected to the base 31, and the linear valve displacement module 34 is sleeved and connected to the screw 33; the transmission shaft of the motor 32 is connected to the screw 33; the linear magnetic strip 35 is located above the linear valve displacement module 34, and the linear magnetic strip 35 is parallel to the screw 33; the detection module 2 includes a magnet 22, a magnetic detection device 21 and a module bracket 23, and the detection module 3 remains fixed during operation; the magnetic detection device 21 is connected to the magnet 22, and the magnetic detection device 21 is used to detect the magnetism of the magnet; the magnetic detection device 21 is communicatively connected to the control module 1; a containing space is formed in the magnet 22; when the linear intelligent valve positioner position feedback test device is in working state, the linear magnetic strip passes through the magnet 22; the control module 1 is used to receive the feedback signal generated by the magnetic detection device.

[0030] In the embodiment of the present application, the linear stroke valve displacement module 34 is a module that generates movement following the displacement movement of the linear stroke valve during the operation of the linear stroke valve. Optionally, the module is implemented as a component on the linear stroke valve, or the module is implemented as a slider connected to the linear stroke valve. The present application takes the linear stroke valve displacement module 34 as a slider connected to the linear stroke valve as an example for subsequent description.

[0031] In the embodiment of the present application, the linear magnetic strip 35 is implemented as a rectangular magnetic strip, and the magnetic distribution on the rectangular magnetic strip is uneven. When the linear magnetic strip 35 passes through the magnetizer 22, the magnetism received by the magnetizer 22 will change, and the change will be detected by the magnetic detection device at the same time. In this case, the magnetic detection device 21 sends the specific value of the magnetic change to the control module, and the control module can determine the specific displacement of the linear valve displacement module based on the specific value and the pre-stored magnetic change curve.

[0032] It should be noted that the magnetic detection device 21 is implemented as a combination of a circuit board and a TMR chip, and the TMR chip is implemented as a chip of model TMR2505T. The TMR chip is bonded to the circuit board, and the TMR chip is located between the first magnetic part and the second magnetic part.

[0033] Figure 4 The schematic structure of a circuit board is shown. Through the combination of the TMR chip and the circuit board, the magnetic detection device can determine the magnetism of the magnetic conductor. An amplifier circuit 211 and a reference voltage circuit 212 are arranged on the circuit board. The input end of the amplifier circuit 211 is connected to the output end of the TMR chip, and the reference voltage circuit 212 is connected to the amplifier circuit 211 to provide a reference voltage for the amplifier circuit 211.

[0034] The embodiments of the present application do not limit the specific implementation form of the magnetic detection device. Among them, TMR (Tunnel Magneto Resistance) is a tunnel magnetoresistance technology.

[0035] Optionally, the TMR chip in the magnetic detection device has a data processing function, that is, in some embodiments, the magnetic detection device can directly generate and feedback the distance change value to the control module based on the change in magnetic intensity. In this case, the TMR chip is configured with additional data processing functions. In other embodiments of the present application, the above-mentioned linear intelligent valve positioner position feedback test device is also connected to a host computer device, which is implemented as a computer device. The magnetic detection device is directly connected to the host computer device or connected to the host computer device through the control module, and the magnetic intensity change determined by the magnetic detection device is processed as a displacement change through the host computer device.

[0036] To summarize, the device provided in the embodiment of the present application controls the movement of the linear valve displacement module through the control module during the operation of the device. During the movement of the linear valve displacement module, the magnetic detection device in the detection module will feedback the magnetic signal to the control module. After receiving the feedback signal, the control module can accurately determine the specific displacement amount of the linear valve displacement module based on the magnetic changes indicated in the feedback signal.

[0037] Next, the specific structure of each component involved in the present invention is further described: In one possible implementation, see Figure 5 , the linear magnetic strip is an axisymmetric structure. In addition, the linear magnetic strip includes two groups of magnet arrays 351, and each group of magnet arrays 351 includes at least two magnets 3511. The two groups of magnet arrays 351 are axially symmetrically distributed on one side of the linear magnetic strip to form an axisymmetric structure.

[0038] In a possible implementation, in the magnet array 351 , the distance between two adjacent magnets 3511 is the same; or, the distance between two adjacent magnets 3511 increases; or, the distance between two adjacent magnets 3511 decreases.

[0039] The specific implementation form of the linear magnetic strip in the present application embodiment is as follows Figure 5 The distance is carried out in the form shown. Optionally, two mounting holes 352 are also provided on the linear magnetic strip 35 in a circumferentially symmetrical form.

[0040] That is, in the present invention, the linear magnetic strip 35 can be implemented as a combination of a magnetic part and a non-magnetic part under the premise of achieving axial symmetry. For example, in one implementation, Figure 5 In the straight-stroke magnetic strip shown, the portion that wraps the magnet array is the non-magnetic portion, and the portion above the magnetic portion is the magnetic portion magnetic strip. This application does not limit the specific distribution relationship between the magnetic portion and the non-magnetic portion in the straight-stroke magnetic strip.

[0041] In one possible implementation, see Figure 3 The magnetic conductor includes a first magnetic portion 221 and a second magnetic portion 222; the first magnetic portion 221 and the second magnetic portion 222 are both L-shaped, and the first magnetic portion 221 is connected to the second magnetic portion 222 to form a receiving space in the magnetic conductor. Optionally, the first magnetic portion 221 and the second magnetic portion 222 are integrally formed.

[0042] In the embodiment of the present application, the accommodation space formed in the middle of the magnetic conductor is used to set the magnetic detection device.

[0043] In a possible implementation, the connection method of the screw and the motor is further described: the screw is equipped with a screw fixing device; the screw fixing device is fixedly connected to the base; the screw fixing device supports the screw. In a possible implementation, the motor is implemented as a stepper motor; the motor is equipped with a motor fixing seat; the motor fixing seat is fixedly connected to the base; the motor fixing seat has an opening, and the transmission shaft of the motor passes through the opening and is connected to the screw.

[0044] In a possible implementation, the connection method of the screw rod and the motor is further described: the detection module includes a module bracket; the magnetic conductor is located on the side of the detection module bracket.

[0045] In a possible implementation, the device further includes a host computer; the control module is in communication connection with the host computer; and the host computer is implemented as a computer device. Figure 6, when the control module is connected to the host computer for communication. Optionally, the host computer can control the module to communicate via RS232. At this time, the control module can feed back the magnetic detection signal to the host computer, and the host computer further processes the magnetic detection signal to obtain the displacement of the linear intelligent valve positioner, or parameters related to the displacement.

[0046] Figure 7 A flow chart of a displacement measurement method for a linear intelligent valve positioner provided by an exemplary embodiment of the present application is shown, and the method is applied to Figures 1 to 6 Taking any of the displacement measurement devices of the straight-stroke intelligent valve positioner shown as an example, the method comprises the following steps: Step S1: The equipment is started, and the detection module is started to enter the state to be detected; the control module sends a control signal to instruct the motor to move, the motor is started, and the screw is driven to move, so that the linear valve displacement module moves along the screw; Step S2: When the linear valve displacement module moves along the screw rod, the control module controls the motor to drive the linear valve displacement module to drive the linear magnetic strip to move; the linear magnetic strip passes through the magnetic conductor; Step S3: When the linear magnetic strip passes through the magnetic conductor, the magnetic detection device detects the magnetism of the magnetic conductor in real time, determines the specific value of the magnetic change to generate a magnetic detection signal, and the magnetic detection device generates the magnetic detection signal based on the specific value of the magnetic change and feeds back the magnetic detection signal to the control module; Step S4: the control module receives and feeds back the magnetic detection signal to the upper computer, and the upper computer is used to determine the displacement of the linear intelligent valve positioner based on the magnetic detection signal.

[0047] That is, in the process shown in the embodiment of the present application, the staff starts the equipment, the detection module starts, and enters the state to be detected; the control module sends a control signal to instruct the motor to move, the motor starts, drives the screw to move, and makes the linear valve displacement module move along the screw. In the process of the linear valve displacement module moving along the screw, the linear magnetic strip passes through the magnet. In this process, the magnetic detection module detects the magnetism of the magnet in real time and generates a feedback signal corresponding to the magnetism. The control module can receive the feedback signal and determine the displacement of the linear magnetic strip relative to the magnet based on the feedback signal, thereby determining to generate the result.

[0048] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A displacement measuring device for a linear intelligent valve positioner, characterized in that: The device comprises a control module (1), a detection module (2) and a motion module (3); The control module (1) is respectively connected to the motion module (3) and the detection module (2) for communication; The control module (1) is used for data collection of the detection module and motion control of the motion module (3); The detection module (2) is used to detect the magnetism of the magnetic conductor; the control module (1) is also used to receive a feedback signal generated by a magnetic detection device of the detection module (2); The motion module (3) comprises a base (31), a motor (32), a screw (33), a linear valve displacement module (34) and a linear magnetic strip (35); The motor (32) and the screw rod (33) are fixedly connected to the base (31), and the linear valve displacement module (34) is sleeve-connected to the screw rod (33); The transmission shaft of the motor (32) is connected to the screw rod (33); The linear magnetic strip (35) is located above the linear valve displacement module (34), and the linear magnetic strip (35) is parallel to the screw rod (33); The detection module (2) comprises a magnetic conductor (22), a magnetic detection device (21) and a detection module bracket (23); the detection module (2) remains fixed during operation; The magnetic detection device (21) is connected to the magnetic conductor (22), and the magnetic detection device (21) is used to detect the magnetism of the magnetic conductor (22); the magnetic conductor (22) is located on a side of the detection module bracket (23); The magnetic detection device (21) is communicatively connected to the control module (1); An accommodation space is formed in the magnetic conductor (22), and the accommodation space is used to accommodate the magnetic detection device (21); When the linear intelligent valve positioner position feedback test device is in a working state, the linear magnetic strip (35) passes through the magnetic conductor (22); The control module (1) is also used to receive a feedback signal generated by the magnetic detection device (22).

2. The displacement measuring device of the linear intelligent valve positioner according to claim 1, characterized in that: The linear magnetic strip (35) is an axisymmetric structure.

3. The displacement measuring device of the linear intelligent valve positioner according to claim 2, characterized in that: The linear magnetic strip (35) comprises two groups of magnet arrays (351); Each group of the magnet arrays (351) includes at least two magnets (3511); The two groups of magnet arrays (351) are axially symmetrically distributed on one side of the linear magnetic strip (35).

4. The displacement measuring device of the linear intelligent valve positioner according to claim 3, characterized in that: In the magnet array (351), the distance between two adjacent magnets (3511) is the same; or, The distance between two adjacent magnets (3511) increases gradually; or, The distance between two adjacent magnets (3511) decreases gradually.

5. The displacement measuring device of the linear intelligent valve positioner according to claim 1, characterized in that: The magnetic conductor (22) comprises a first magnetic portion (221) and a second magnetic portion (222); The first magnetic part (221) and the second magnetic part (222) are both L-shaped, and the first magnetic part (221) is connected to the second magnetic part (222) so that an accommodation space is formed in the magnetic conductor (22).

6. The displacement measuring device of the linear intelligent valve positioner according to claim 5, characterized in that: The first magnetic part (221) and the second magnetic part (222) are integrally formed.

7. The displacement measuring device of the linear intelligent valve positioner according to claim 1, characterized in that: The screw rod (33) is provided with a screw rod fixing device; The screw fixing device is fixedly connected to the base; The screw rod fixing device supports the screw rod.

8. The displacement measuring device of the linear intelligent valve positioner according to claim 1, characterized in that: The motor (32) is implemented as a stepper motor; The motor (32) is provided with a motor fixing seat (36); The motor fixing seat (36) is fixedly connected to the base (31); The motor fixing seat (36) has an opening, and the transmission shaft of the motor (32) passes through the opening and is connected to the screw rod (33).

9. The displacement measuring device of a linear intelligent valve positioner according to claim 1, characterized in that: It also includes a host computer (4), which is communicatively connected to the control module (1); and is communicatively connected to the detection module (2) and the motion module (3) respectively through the control module (1).

10. A displacement measurement method for a linear intelligent valve positioner, characterized in that: The method is applied to the displacement measuring device of the linear intelligent valve positioner according to any one of claims 1 to 9, and the method comprises the following steps: Step S1: The equipment is started, and the detection module is started to enter the state to be detected; the control module sends a control signal to instruct the motor to move, the motor is started, and the screw is driven to move, so that the linear valve displacement module moves along the screw; Step S2: When the linear valve displacement module moves along the screw rod, the control module controls the motor to drive the linear valve displacement module to drive the linear magnetic strip to move; the linear magnetic strip passes through the magnetic conductor; Step S3: When the linear magnetic strip passes through the magnetic conductor, the magnetic detection device detects the magnetism of the magnetic conductor in real time, determines the specific value of the magnetic change to generate a magnetic detection signal, and the magnetic detection device generates the magnetic detection signal based on the specific value of the magnetic change and feeds back the magnetic detection signal to the control module; Step S4, the control module receives and feeds back the magnetic detection signal to the upper computer, and the upper computer is used to determine the displacement of the linear travel intelligent valve positioner based on the magnetic detection signal.

Images