Rotary-cut valve branch flow channel switching method

Abstract

The rotary-cut valve branch flow channel switching method comprises the steps that the number of a target branch flow channel and the number of a current branch flow channel are obtained and defined as a first number and a second number respectively; obtaining a difference value between the first number and the second number; if the difference value is-2,-1, 4 or 5, anticlockwise rotating to a target branch flow channel; if the difference value is-5,-4,-3, 0, 1, 2 or 3, clockwise rotating to a target branch flow channel; the rotating direction is automatically selected instead of rotating in a single direction traditionally, switching time is saved, abrasion to the surface of the valve body is reduced, and the service life of the valve body is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of methods for switching branch flow channels of rotary shear valves, and in particular to a method for switching branch flow channels of rotary shear valves. Background Art

[0002] The existing six-channel rotary cutting valve generally includes a drive control board, a planetary gear reduction motor, a code disk and a valve head assembly. The channels are evenly distributed around the top surface of the valve body at an angle of 60° from the center. A common channel opening is left in the center, which is the main liquid flow channel, and the six channels distributed around the circle are branch flow channels.

[0003] The drive plate controls the reduction motor to rotate at a certain speed, thereby controlling the rotation of the valve body.

[0004] The six branch flow channels are defined as branch flow channel No. 1, branch flow channel No. 2, branch flow channel No. 3, branch flow channel No. 4, branch flow channel No. 5 and branch flow channel No. 6 in clockwise order.

[0005] The existing branch flow channel switching method is as follows:

[0006] For example, the currently opened branch flow channel is branch flow channel No. 1, and the user wants to drive the main liquid flow channel to be connected with branch flow channel No. 5. If it rotates in a clockwise direction, it is necessary to first rotate from branch flow channel No. 1 to branch flow channel No. 2, and then to branch flow channel No. 3, and then to branch flow channel No. 4, and finally to branch flow channel No. 5. This process requires rotating through three unnecessary branch flow channel liquid channels to reach branch flow channel No. 5, resulting in a long switching time, increased wear on the valve body surface, and subsequently affecting the normal use of the valve body.

[0007] Therefore, in the patent application of the present invention, the applicant carefully studied a method for switching the branch flow channel of a rotary cutting valve to solve the above-mentioned problem. Summary of the invention

[0008] In view of the shortcomings of the above-mentioned prior art, the main purpose of the present invention is to provide a method for switching the branch flow channel of a rotary cut valve, which automatically selects the rotation direction instead of rotating in a single direction as traditionally, thereby saving switching time, reducing the wear on the valve body surface, and extending the service life of the valve body.

[0009] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme:

[0010] A method for switching branch flow channels of a rotary cut valve is based on a six-channel rotary cut valve. Six branch flow channels are evenly spaced along the circumference of the six-channel rotary cut valve. The six branch flow channels are defined as branch flow channel No. 1, branch flow channel No. 2, branch flow channel No. 3, branch flow channel No. 4, branch flow channel No. 5 and branch flow channel No. 6 in clockwise order.

[0011] The switching methods include:

[0012] Step 1: Obtain the number of the target branch flow channel and the number of the current branch flow channel, and define them as the first number and the second number respectively;

[0013] Step 2, obtaining the difference between the first number and the second number;

[0014] If the difference is -2, -1, 4, or 5, rotate counterclockwise to the target branch flow channel;

[0015] If the difference is -5, -4, -3, 0, 1, 2, or 3, rotate clockwise to the target branch flow channel.

[0016] As a preferred solution, a stop position is provided between adjacent branch flow channels.

[0017] As a preferred solution, after the six-channel rotary cutting valve is powered on, it is determined whether it has been reset. If it has been reset, it directly enters step 1. If not, the current branch flow channel is reset and rotated to branch flow channel No. 1, and then it is marked as reset, and then it enters step 1.

[0018] As a preferred solution, the method for resetting and rotating the current branch flow channel to branch flow channel No. 1 includes:

[0019] Get the difference between 1 and the second number;

[0020] If the difference is -2, -1, 4 or 5, the current branch flow channel is rotated counterclockwise to reset to branch flow channel No. 1;

[0021] If the difference is -5, -4, -3, 0, 1, 2 or 3, the current branch flow channel is rotated clockwise to branch flow channel No. 1.

[0022] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it automatically selects the rotation direction by judging whether the difference between the number of the target branch flow channel and the number of the current branch flow channel is within the corresponding value, rather than the traditional rotation in a single direction. This saves switching time, reduces the wear on the valve body surface, and extends the service life of the valve body.

[0023] In order to more clearly illustrate the structural features and effects of the present invention, it is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the distribution of six branch flow channels and stop positions according to an embodiment of the present invention;

[0025] Description of Figure Numbers:

[0026] 11. No. 1 branch flow channel

[0027] 12. No. 2 branch flow channel

[0028] 13. No. 3 branch flow channel

[0029] 14. Branch 4 flow channel

[0030] 15. No. 5 branch flow channel

[0031] 16, No. 6 branch flow channel

[0032] 17. Stop bit. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figure 1 As shown, a method for switching branch flow channels of a rotary cutting valve is based on a six-channel rotary cutting valve. Six branch flow channels are arranged at uniform intervals along the circumferential direction of the six-channel rotary cutting valve, and a stop position 17 is arranged between adjacent branch flow channels.

[0035] The six branch flow channels are defined as branch flow channel No. 11, branch flow channel No. 2 12, branch flow channel No. 3 13, branch flow channel No. 4 14, branch flow channel No. 5 15 and branch flow channel No. 6 16 in clockwise order;

[0036] The switching methods include:

[0037] Step 1: Obtain the number of the target branch flow channel and the number of the current branch flow channel, and define them as the first number and the second number respectively.

[0038] Step 2: Obtain the difference between the first number and the second number.

[0039] If the difference is -2, -1, 4 or 5, rotate counterclockwise to the target branch flow channel.

[0040] If the difference is -5, -4, -3, 0, 1, 2, or 3, rotate clockwise to the target branch flow channel.

[0041] In this embodiment, after the six-channel rotary cutting valve is powered on, it is determined whether it has been reset. If so, directly enter step 1. If not, the current branch flow channel is reset and rotated to branch flow channel No. 1, and then it is marked as reset, and then enter step 1.

[0042] Preferably, the method of resetting and rotating the current branch flow channel to branch flow channel No. 1 includes:

[0043] Get the difference between 1 and the second number;

[0044] If the difference is -2, -1, 4 or 5, the current branch flow channel is rotated counterclockwise to reset to branch flow channel No. 1;

[0045] If the difference is -5, -4, -3, 0, 1, 2 or 3, the current branch flow channel is rotated clockwise to branch flow channel No. 1.

[0046] It should be noted that before operation, it is determined whether it has been reset to implement the calibration function of the six-channel rotary cutting valve to avoid deviations in the positions of each channel due to the cumulative errors of the six-channel rotary cutting valve, thereby affecting the positioning accuracy of the user.

[0047] During the reset rotation process, the rotation direction is automatically selected instead of the traditional single direction rotation, which further saves switching time, reduces the wear on the valve body surface, and extends the service life of the valve body.

[0048] In the present embodiment, the circumference of the six-channel rotary cut valve is divided into 12 equal parts, that is, 12 points, of which 6 points are allocated to the branch channels, and the other 6 points are allocated as stop positions 17. When the user rotates from the current branch channel to the target branch channel, the stop position 17 must be passed, so that the function of quickly closing the rotary cut valve can be realized. Compared with the traditional rotary cut valve, only one point is designed as the stop position 17, which will result in the need to rotate through some channels that do not need to be conducted, causing the conduction of irrelevant liquid circuits, and increasing the time to control the rotary cut valve. In the present embodiment, branch channel No. 1 11 is reused as the reset position, that is, after it needs to be reset, that is, before entering the target branch channel, it is first rotated to branch channel No. 1 11, and then the number of the target branch channel and the number of the current branch channel are obtained.

[0049] The six-channel rotary cut valve is equipped with RS485 and CAN communication interfaces for end users, which is convenient for users to communicate and control their own control systems with the rotary cut valve. The communication methods have corresponding RS485 and CAN communication protocol instructions and instruction instructions. RS485 is an asynchronous serial, half-duplex 8-byte instruction format, the default baud rate is 9600bit / s, and supports the existing USB to RS485 communication board on the market. CAN communication uses a standard data frame, 8 bytes, and the default baud rate is 250k bit / s, which supports the existing CAN communication analyzers on the market, such as Chuangxin Technology's CANalyst-II analyzer.

[0050] The bus can mount 127 devices, and the device ID address range is: 0x01 ~ 0x7F. RS485 and CAN communication instructions use the same set of instructions, which is convenient for users to use and control, ensuring that the device is connected normally. Unused communication lines need to be insulated to avoid short circuits between communication lines or high-voltage pulse signal input that may damage the device.

[0051] For the setting of baud rate, the default baud rate of RS485 of the six-channel rotary cutting valve is 9600bit / s. In this embodiment, five commonly used baud rates are set: 9600, 19200, 38400, 57600, and 115200. The driver board control software defines 1 for baud rate 9600bit / s, 2 for baud rate 19200bit / s, 3 for baud rate 38400bit / s, 4 for baud rate 57600bit / s, and 5 for baud rate 115200bit / s. According to the protocol instructions, the user sends the corresponding device ID + function code + the number corresponding to the baud rate + CRC check code through the host computer software such as the serial port debugging assistant or the user's own control system. When the six-channel rotary cutting valve receives the instruction data frame, the driver control board software automatically decodes and executes the program to change the baud rate. The user's own control system needs to send a command to save the parameters and restart the six-channel rotary cutting valve after power off to take effect. The baud rate of CAN communication is also changed in this way. The driver board control software defines that 1 represents a baud rate of 100Kbit / s, 2 represents a baud rate of 125Kbit / s, 3 represents a baud rate of 250Kbit / s, 4 represents a baud rate of 500Kbit / s, and 5 represents a baud rate of 1000Kbit / s. According to the protocol instructions, the user sends the corresponding device ID + function code + the number corresponding to the baud rate + CRC check code through the serial port debugging assistant host software or the user's own control system. The data frame, when the six-channel rotary cutting valve receives the instruction data frame, the driver control board software automatically decodes and executes the program to change the baud rate. The user's own control system needs to send a command to save the parameters and restart the six-channel rotary cutting valve after power off to take effect.

[0052] In this embodiment, the current position of the six-channel valve body can be queried. Preferably, the valve body position query instruction is defined through the software communication protocol. If the main channel of the valve body is in conduction with a branch flow channel, the branch flow channel is connected to the main liquid path. According to the defined channel sequence number, the drive control board will record which branch flow channel the valve body is connected to after the current operation. When the customer's main control system issues a query current position instruction, after the rotary cutting valve control board receives the instruction, the software will read the stored current branch flow channel number, and return the current branch flow channel number to the user's main control system through the data frame composed of the defined communication protocol. After receiving it, the user's main control system can know the current position number of the valve body by parsing the corresponding bytes.

[0053] For example, if the valve body is connected to the main liquid path at branch channel 13 of No. 3, the branch channel number byte defined in the return value is 03. When the valve body of the six-channel rotary cut valve is in the off state, the return value needs to reflect which two branch channels the valve body is between. According to this requirement, the software defines the return value format and the bytes corresponding to the valve body position are XY, where X and Y are the numbers of two branch channels. For example, the valve body of the six-channel rotary cut valve is at the stop position 17 between branch channel 13 of No. 3 and branch channel 14 of No. 4, that is, the six-channel rotary cut valve is in the off state. When the main control system issues a command to query the current position, the rotary cut valve control board of the six-channel rotary cut valve receives the command, and the branch channel number byte defined in the return value is 34. After the user reads this return value, he can clearly know that the exact position of the valve body is stopped between branch channel 13 of No. 3 and branch channel 14 of No. 4 and is in the off state. In this embodiment, by defining the return value of closing the six-channel rotary cutting valve, a simple number that is easy for the user to identify is used, which facilitates the user's main control system to identify and accurately understand the exact position of the valve body. The return value defined by this method is intuitive and clearly feedbacks the stop position of the valve body.

[0054] The key point of the design of the present invention is that it automatically selects the rotation direction by judging whether the difference between the number of the target branch flow channel and the number of the current branch flow channel is within the corresponding value, rather than the traditional rotation in a single direction, which saves switching time, reduces the wear on the valve body surface, and extends the service life of the valve body.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for switching branch flow channels of a rotary cutting valve, which is based on a six-channel rotary cutting valve, wherein six branch flow channels are evenly spaced along the circumference of the six-channel rotary cutting valve, and the six branch flow channels are respectively defined as branch flow channel No. 1, branch flow channel No. 2, branch flow channel No. 3, branch flow channel No. 4, branch flow channel No. 5 and branch flow channel No. 6 in clockwise direction; Features: The switching methods include: Step 1: Obtain the number of the target branch flow channel and the number of the current branch flow channel, and define them as the first number and the second number respectively; Step 2, obtaining the difference between the first number and the second number; If the difference is -2, -1, 4, or 5, rotate counterclockwise to the target branch flow channel; If the difference is -5, -4, -3, 0, 1, 2, or 3, rotate clockwise to the target branch flow channel.

2. The method for switching a branch flow channel of a rotary shear valve according to claim 1, characterized in that: A stop position is set between adjacent branch flow channels.

3. The method for switching a branch flow channel of a rotary shear valve according to claim 1, characterized in that: After the six-channel rotary cut valve is powered on, determine whether it has been reset. If so, go directly to step 1. If not, reset the current branch flow channel to branch flow channel No. 1, then mark it as reset, and then go to step 1.

4. The method for switching a branch flow channel of a rotary shear valve according to claim 3, characterized in that: The method of resetting and rotating the current branch flow channel to branch flow channel No. 1 includes: Get the difference between 1 and the second number; If the difference is -2, -1, 4 or 5, the current branch flow channel is rotated counterclockwise to reset to branch flow channel No. 1; If the difference is -5, -4, -3, 0, 1, 2 or 3, the current branch flow channel is rotated clockwise to branch flow channel No. 1.

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