Non-magnetic sandblasting and shot blasting flow valve and its control circuit and control method

Abstract

The present invention relates to a non-magnetic sandblasting and shot blasting flow valve and its control circuit and control method. The non-magnetic sandblasting and shot blasting flow valve includes: a flow regulating part, including a first shell and a motor control component, a solenoid valve control component and a floating head fixed inside the first shell, the motor control component is used to control the power on / off and movement of the solenoid valve control component; the solenoid valve control component is magnetically connected to the floating head in the energized state; a flow detection part, including a second shell, a guide tube, a pressing piece, a distance sensor and a control circuit board, the upper end opening of the guide tube is connected to the second connection port, the lower end opening of the guide tube faces the pressing piece, one end of the pressing piece is fixed to the inner wall of the second shell, the distance sensor is fixed to the inner wall of the second shell, a distance is set between the distance sensor and the pressing piece, and the distance sensor is electrically connected to the control circuit board; a flange is used to connect and conduct the first shell and the second shell.

Description

Technical Field

[0001] The present invention relates to the technical field of flow valves, and in particular to a non-magnetic sandblasting and shot blasting flow valve and a control circuit and a control method thereof. Background Art

[0002] In the sandblasting and shot blasting industry, flow and air pressure coexist to form a gas-solid two-phase flow; most flow valves on the market are used for liquid control (for example, water), and there is no reliable and stable solution for the gas-solid two-phase flow in the sandblasting and shot blasting industry. In the field of shot blasting, air pressure has a significant impact on flow detection, and the actual flow is seriously affected by air pressure. There is a direct relationship between flow and air pressure, making it difficult to achieve arbitrary flow adjustment and large flow control. The application scenario has high environmental requirements, is difficult to debug, has a long debugging cycle, has low stability, and has low actual application accuracy and large fluctuations. The technical difficulties lie in: how to make the flow unaffected by air pressure; how to achieve a normally closed function; and how to improve stability and accuracy. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides a non-magnetic sandblasting and shot blasting flow valve and its control circuit and control method, aiming to solve the problems of how to make the flow unaffected by air pressure; how to achieve a normally closed function; and how to improve stability and accuracy.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] In a first aspect, a non-magnetic sandblasting and shot blasting flow valve comprises:

[0006] The flow regulating portion includes a first housing and a motor control assembly, a solenoid valve control assembly, and a floating head fixed inside the first housing. The first housing is provided with a first connection port. The motor control assembly is used to control the power on / off of the solenoid valve control assembly and the movement of the solenoid valve control assembly. The solenoid valve control assembly is magnetically connected to the floating head when powered on. The floating head is used to open / close the first connection port and adjust the opening size of the first connection port.

[0007] The flow detection portion includes a second housing, a guide tube, a pressing piece, a distance sensor, and a control circuit board. The second housing is provided with a second connection port. One end opening of the guide tube is in communication with the second connection port, and the other end opening of the guide tube faces the pressing piece. One end of the pressing piece is fixed to the inner wall of the second housing. The projection of the guide tube on the bottom of the second housing completely falls within the projection of the pressing piece on the bottom of the second housing. The distance sensor is fixed to the inner wall of the second housing. A gap is provided between the distance sensor and the pressing piece. The distance sensor and the motor control assembly are both electrically connected to the control circuit board.

[0008] A flange, one end of the flange is connected to the first connection port, and the other end of the flange is connected to the second connection port.

[0009] Preferably, the motor control component includes a stepper motor, a screw, an electromagnet and an origin switch; the stepper motor is fixed inside the first shell, and the stepper motor is electrically connected to the control circuit board; the stepper motor is transmission-connected to the electromagnet through the screw; the electromagnet is electrically connected to the control circuit board, the electromagnet is fixedly connected to the solenoid valve control component, and is electrically connected to the solenoid valve control component when powered on, the origin switch is fixed inside the first shell and electrically connected to the control circuit board, and is used to determine the origin position of the electromagnet.

[0010] Preferably, the solenoid valve control assembly includes a permanent magnet, a sleeve and a spring, the permanent magnet is fixedly connected to the electromagnet, a pin sleeve is provided in the permanent magnet, the electromagnet is provided with a pin, the pin moves to be inserted into the pin sleeve, and the permanent magnet is energized; the sleeve is fixed inside the first shell, the permanent magnet is sleeved in the sleeve, the spring is sleeved in the sleeve, one end of the spring is connected to the permanent magnet, and the other end of the spring is connected to the inner wall of the first shell, the floating head is provided with a connecting rod, and the connecting rod is provided inside the sleeve.

[0011] Preferably, the first shell is provided with a separated first accommodating chamber and a first circulation chamber, the motor control component and the solenoid valve control component are arranged in the first accommodating chamber, the floating head is arranged in the first circulation chamber, a first through hole is provided between the first accommodating chamber and the first circulation chamber, the solenoid valve control component is connected to the floating head through the first through hole, the first connection port is provided at the bottom of the first circulation chamber, and an inlet is also provided at the top of the first circulation chamber.

[0012] Preferably, the second shell is provided with a separated second accommodating chamber and a second circulation chamber, the control circuit board is arranged in the second accommodating chamber, the pressing piece and the distance sensor are arranged in the second circulation chamber, the second connection port is arranged at the top of the second circulation chamber, and the second circulation chamber is also provided with a guide outlet at the bottom.

[0013] Preferably, the shape of the floating head is conical or a combination of a cone and a cylinder, the shape of the first connection port is circular, and the projection of the floating head on the horizontal plane completely covers the first connection port.

[0014] Preferably, the lower end opening of the guide tube is an oblique opening, the pressing sheet is arranged at an angle, and the cutting inclination of the oblique opening is the same as the cutting inclination of the pressing sheet.

[0015] In a second aspect, a control circuit for a non-magnetic sandblasting and shot blasting flow valve comprises:

[0016] MCU processor;

[0017] A DC-DC power supply circuit, wherein the DC-DC power supply circuit is electrically connected to the MCU processor, and the DC24V power supply is converted into DC3.3V by the DC-DC power supply circuit to power the MCU processor;

[0018] A motor control circuit, electrically connected to the MCU processor, for controlling the start / stop of the stepper motor;

[0019] A solenoid valve control circuit, electrically connected to the MCU processor, for controlling the power on / off of the electromagnet;

[0020] A sensing device, comprising a pressing plate and a distance sensor, wherein the distance sensor is electrically connected to the MCU processor. When the non-magnetic shot and abrasive material flows into the sensing device, the pressing plate undergoes different deformations in response to the non-magnetic shot and abrasive material at different flow rates. The distance sensor collects the deformation to generate an analog signal, and transmits the analog signal to the MCU processor. The MCU processor calibrates the obtained analog signal with the actual weight to obtain a relationship curve, thereby achieving real-time flow acquisition.

[0021] a display driving circuit, the display driving circuit being electrically connected to the MCU processor and converting the analog signal into a digital signal;

[0022] A digital tube display window, wherein the digital tube display window is electrically connected to the display drive circuit, and the analog signal of the real-time flow rate is converted into the digital signal by the display drive circuit and then displayed through the digital tube display window;

[0023] RS485 interface, the RS485 interface is electrically connected to the MCU processor, the MCU processor adopts the standard modbus RTU protocol, and outputs the flow signal for collection by the external host computer through the RS485 interface.

[0024] In a third aspect, a method for controlling a non-magnetic sandblasting and shot blasting flow valve comprises the following steps:

[0025] (1) The control circuit board controls the stepper motor to start, and the stepper motor drives the electromagnet to descend and return to the origin through the induction origin switch;

[0026] (2) The control circuit board controls the electromagnet to be energized, generating a magnetic force to drive the pin into the pin sleeve positioning position of the permanent magnet, connecting the permanent magnet, and energizing the permanent magnet;

[0027] (3) The stepper motor drives the electromagnet to move the permanent magnet up or down;

[0028] (4) The permanent magnet drives the floating head to rise or fall through magnetic force, opens / closes the first connection port, and adjusts the opening size of the first connection port, thereby realizing the control of the opening size of the first connection port through the stepper motor;

[0029] (5) The pressing piece is deformed by the non-magnetic abrasive pellets flowing out of the guide tube. The distance sensor collects the deformation to generate an analog signal and transmits the analog signal to the control circuit board.

[0030] (6) The control circuit board obtains the analog signal and calculates the actual flow rate of the non-magnetic abrasive through the relationship curve between the calibrated flow rate and the analog signal;

[0031] (7) The control circuit board determines whether the flow rate is within the preset range. If it is within the preset range, the control circuit board controls the stepper motor to turn off; if it is not within the preset range, the control circuit board controls the stepper motor to start and adjust the height of the floating head to stabilize the flow rate;

[0032] (8) The control circuit board controls the electromagnet to cut off power, the permanent magnet to cut off power and reset, and the floating head closes the first connection port, thereby realizing the normally closed characteristic.

[0033] Preferably, in step (8), the control circuit board controls the electromagnet to lose power, or an abnormal power outage causes the electromagnet to lose power, the pin retracts, and the spring pushes the permanent magnet back to the initial position, thereby realizing the normally closed characteristic.

[0034] The non-magnetic sandblasting and shot blasting flow valve and its control circuit and control method described in the present invention have the following beneficial effects:

[0035] (1) The flow detection part of the present invention can detect the flow of the non-magnetic shot abrasive flowing into the second shell, and the flow regulation part can regulate the flow of the non-magnetic shot abrasive flowing into the second shell according to the detection value of the flow detection part, so that the flow of the non-magnetic shot abrasive flowing into the second shell meets the user's needs.

[0036] (2) Since the flow detection part uses a combination of a pressing plate and a distance sensor to detect the flow of non-magnetic shot abrasives, the non-magnetic shot abrasives exert force on the pressing plate under the action of gravity. Since only one end of the pressing plate is fixed in the second shell, it is easy to deform. The deformation of the pressing plate is detected by the distance sensor, and the actual flow of the non-magnetic shot abrasives is obtained. Because the non-magnetic shot abrasives are discharged from the conduit to the second flow cavity, the volume of the second flow cavity is larger than the volume of the conduit, so the air pressure is balanced, and the air pressure cannot affect the pressing plate. Therefore, the detection of the flow of non-magnetic shot abrasives will not be affected by the air pressure, thereby improving stability and accuracy.

[0037] (3) The motor control component can control the power on / off of the solenoid valve control component and control the movement of the solenoid valve control component. The solenoid valve control component is magnetically connected to the float head when it is powered on. Therefore, in the power-off state, the float head cannot be magnetically connected to the solenoid valve control component. Therefore, the float head will block the first connection port when it is not powered on. When the solenoid valve control component is powered on, the movement of the solenoid valve control component is controlled by the motor control component, and then the solenoid valve control component drives the float head to adjust the opening size of the first connection port. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic cross-sectional view of the non-magnetic sandblasting and shotblasting flow valve of the present invention.

[0039] Figure 2 It is a connection structure block diagram of the control circuit of the non-magnetic sandblasting and shotblasting flow valve of the present invention.

[0040] Figure 3 It is a flow chart of a control method of a non-magnetic sandblasting and shot blasting flow valve of the present invention.

[0041] Figure 4 It is a calibration relationship curve diagram of the flow rate of the non-magnetic sandblasting and shot blasting flow valve of the present invention and the analog signal.

[0042] Explanation of the accompanying drawings: 1. Flow regulating part; 11. First shell; 111. First accommodating chamber; 112. First circulation chamber; 121. Stepping motor; 122. Screw; 123. Electromagnet; 124. Origin switch; 125. Pin; 131. Permanent magnet; 132. Sleeve; 133. Spring; 134. Connecting rod; 135. Pin sleeve; 14. Floating head; 2. Flow detecting part; 21. Second shell; 211. Second accommodating chamber; 212. Second circulation chamber; 22. Guide tube; 23. Pressing piece; 24. Distance sensor; 25. Control circuit board; 3. Flange. DETAILED DESCRIPTION

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 As shown, the present invention provides a non-magnetic sandblasting and shot blasting flow valve, comprising:

[0045] The flow regulating portion 1 includes a first housing 11 and a motor control assembly, a solenoid valve control assembly, and a floating head 14 fixed within the first housing 11. The first housing 11 is provided with a first connection port. The motor control assembly is used to control the power on / off of the solenoid valve control assembly and the movement of the solenoid valve control assembly. The solenoid valve control assembly is magnetically connected to the floating head 14 when powered. The floating head 14 is used to open / close the first connection port and adjust the opening size of the first connection port.

[0046] The flow detection part 2 includes a second shell 21, a guide tube 22, a pressing piece 23, a distance sensor 24, and a control circuit board 25. The second shell 21 is provided with a second connection port. One end opening of the guide tube 22 is connected to the second connection port, and the other end opening of the guide tube 22 faces the pressing piece 23. One end of the pressing piece 23 is fixed to the inner wall of the second shell 21. The projection of the guide tube 22 at the bottom of the second shell 21 completely falls into the projection of the pressing piece 23 at the bottom of the second shell 21. The distance sensor 24 is fixed to the inner wall of the second shell 21. A gap is provided between the distance sensor 24 and the pressing piece 23. The distance sensor 24 and the motor control component are both electrically connected to the control circuit board 25.

[0047] Flange 3, one end of the flange 3 is connected to the first connection port, and the other end of the flange 3 is connected to the second connection port.

[0048] The flow detection part 2 of the present invention can detect the flow of non-magnetic shot abrasives flowing into the second shell 21, and the flow regulation part 1 can regulate the flow of non-magnetic shot abrasives flowing into the second shell 21 according to the detection value of the flow detection part 2, so that the flow of non-magnetic shot abrasives flowing into the second shell 21 meets user needs.

[0049] Since the flow detection part 2 uses a combination of a pressing piece 23 and a distance sensor 24 to detect the flow of non-magnetic pill and abrasive, the non-magnetic pill and abrasive exerts a force on the pressing piece 23 under the action of gravity. Since only one end of the pressing piece 23 is fixed in the second shell 21, it is easy to deform. The deformation of the pressing piece 23 is detected by the distance sensor 24, thereby obtaining the flow of the non-magnetic pill and abrasive. Because the non-magnetic pill and abrasive are discharged from the conduit and then reach the second circulation chamber 212, the volume of the second circulation chamber 212 is larger than the volume of the conduit, so the air pressure is balanced, and the air pressure cannot affect the pressing piece 23. Therefore, the detection of the flow of non-magnetic pill and abrasive will not be affected by the air pressure, thereby improving stability and accuracy.

[0050] The motor control component can control the power on / off of the solenoid valve control component and control the movement of the solenoid valve control component. The solenoid valve control component is magnetically connected to the floating head 14 when it is powered on. Therefore, in the power-off state, since the floating head 14 cannot be magnetically connected to the solenoid valve control component, the floating head 14 will block the first connection port when it is not powered. When the solenoid valve control component is powered on, the movement of the solenoid valve control component is controlled by the motor control component, and then the solenoid valve control component drives the floating head 14 to adjust the opening size of the first connection port.

[0051] It should be noted that the motor control component includes a stepper motor 121, a screw 122, an electromagnet 123 and an origin switch 124; the stepper motor 121 is fixed inside the first shell 11, and the stepper motor 121 is electrically connected to the control circuit board 25; the stepper motor 121 is transmission-connected to the electromagnet 123 through the screw 122; the electromagnet 123 is electrically connected to the control circuit board 25, the electromagnet 123 is fixedly connected to the solenoid valve control component, and is electrically connected to the solenoid valve control component when powered on, the origin switch 124 is fixed inside the first shell 11 and electrically connected to the control circuit board 25, and is used to determine the origin position of the electromagnet 123.

[0052] By setting the origin switch 124, the electromagnet 123 can be returned to the origin position, so that the pin 125 of the electromagnet 123 can be accurately inserted into the pin sleeve 135 of the permanent magnet 131, ensuring that the permanent magnet 131 can be energized. At the same time, the stepper motor 121 is connected to the electromagnet 123 via the screw 122, so that the stepper motor 121 can drive the electromagnet 123 to move up and down, thereby causing the permanent magnet 131, whose pin 125 is inserted into the pin sleeve 135, to also move up and down.

[0053] It should be noted that the solenoid valve control assembly includes a permanent magnet 131, a sleeve 132 and a spring 133. The permanent magnet 131 is fixedly connected to the electromagnet 123. A pin sleeve 135 is provided in the permanent magnet 131. The electromagnet 123 is provided with a pin 125. The pin 125 moves to be inserted into the pin sleeve 135, and the permanent magnet 131 is energized; the sleeve 132 is fixed to the inside of the first shell 11, the permanent magnet 131 is sleeved in the sleeve 132, and the spring 133 is sleeved in the sleeve 132. One end of the spring 133 is connected to the permanent magnet 131, and the other end of the spring 133 is connected to the inner wall of the first shell 11. The floating head 14 is provided with a connecting rod 134, and the connecting rod 134 is provided inside the sleeve 132.

[0054] When the pin 125 moves to fit into the pin sleeve 135, the permanent magnet 131 is energized, so that the permanent magnet 131 can be magnetically connected to the connecting rod 134 through magnetic force. When the permanent magnet 131 moves up and down with the electromagnet 123, the connecting rod 134 also moves up and down, thereby driving the floating head 14 to move up and down. After the power is turned off, the spring 133 can drive the permanent magnet 131 to return to its original position, making it easier for the pin 125 to fit into the pin sleeve 135 next time.

[0055] It should be noted that the first shell 11 is provided with a separated first accommodating chamber 111 and a first circulation chamber 112, the motor control component and the solenoid valve control component are arranged in the first accommodating chamber 111, the floating head 14 is arranged in the first circulation chamber 112, and a first through hole is provided between the first accommodating chamber 111 and the first circulation chamber 112. The solenoid valve control component is connected to the floating head 14 through the first through hole, the first connection port is provided at the bottom of the first circulation chamber 112, and an inlet is also provided at the top of the first circulation chamber 112.

[0056] By dividing the first shell 11 into a first accommodating chamber 111 and a first circulation chamber 112, the non-magnetic shot abrasive only circulates in the first circulation chamber 112 during the circulation of the non-magnetic sandblasting and shot blasting flow valve, thereby not affecting the normal operation of the motor control component and the solenoid valve control component in the first accommodating chamber 111. The non-magnetic sandblasting and shot blasting flow valve enters the non-magnetic sandblasting and shot blasting flow valve from the inlet port and is exported from the first connection port.

[0057] It should be noted that the second shell 21 is provided with a separated second accommodating chamber 211 and a second circulation chamber 212, the control circuit board 25 is arranged in the second accommodating chamber 211, the pressing piece 23 and the distance sensor 24 are arranged in the second circulation chamber 212, the second connection port is arranged at the top of the second circulation chamber 212, and the second circulation chamber 212 is also provided with a guide outlet at the bottom.

[0058] By dividing the second shell 21 into a second accommodating chamber 211 and a second circulation chamber 212, the non-magnetic shot abrasives only circulate in the second circulation chamber 212 during the circulation of the non-magnetic sandblasting and shot peening flow valve, thereby not affecting the normal operation of the control circuit board 25 in the second accommodating chamber 211. The non-magnetic sandblasting and shot peening flow valve enters the non-magnetic sandblasting and shot peening flow valve from the second connection port and is discharged from the non-magnetic sandblasting and shot peening flow valve from the outlet.

[0059] It should be noted that the shape of the floating head 14 is conical or a combination of a cone and a cylinder, the shape of the first connection port is circular, and the projection of the floating head 14 on the horizontal plane completely covers the first connection port.

[0060] By setting the shape structure of the floating head 14 to be conical or a combination of a cone and a cylinder, and setting the shape of the first connection port to be circular, the floating head 14 can completely block the first connection port. At the same time, because the floating head 14 is conical or a combination of a cone and a cylinder, the gap between the floating head 14 and the circular first connection port can be adjusted during the up and down movement of the floating head 14, thereby adjusting the flow rate of the non-magnetic shot and abrasive. It should be noted that the combined structure of the cone and the cylinder is such that the bottom surface of the cone and the bottom surface of the cylinder have the same diameter, and the bottom surface of the cone is fixedly connected to the lower bottom surface of the cylinder.

[0061] It should be noted that the lower end opening of the guide tube 22 is an oblique opening, the pressing piece 23 is arranged at an angle, and the cutting slope of the oblique opening is the same as the cutting slope of the pressing piece 23.

[0062] The lower end opening of the guide tube 22 is set as an oblique opening, and the pressing sheet 23 is set at an angle, so that the non-magnetic shot abrasives from the lower end opening of the guide tube 22 can all flow out smoothly from the guide outlet after falling onto the pressing sheet 23 and causing the pressing sheet 23 to deform. If the pressing sheet 23 is set to be placed horizontally, the non-magnetic shot abrasives that fall onto the pressing sheet 23 will accumulate on the pressing sheet 23, which not only affects the accuracy of the distance sensor 24, but also affects the outflow of the non-magnetic shot abrasives.

[0063] like Figure 2 As shown, the present invention also provides a control circuit for a non-magnetic sandblasting and shot blasting flow valve, comprising:

[0064] MCU processor;

[0065] The DC-DC power supply circuit is electrically connected to the MCU processor. The DC24V power supply is converted into DC3.3V by the DC-DC power supply circuit to power the MCU processor.

[0066] The motor control circuit is electrically connected to the MCU processor and is used to control the start / stop of the stepper motor;

[0067] The solenoid valve control circuit is electrically connected to the MCU processor and is used to control the power on / off of the electromagnet;

[0068] The sensing device includes a pressing plate and a distance sensor. The distance sensor is electrically connected to the MCU processor. When non-magnetic pills and abrasives flow into the sensing device, the pressing plate will produce different deformations in response to non-magnetic pills and abrasives with different flow rates. The distance sensor collects the deformation to generate an analog signal and transmits the analog signal to the MCU processor. The MCU processor calibrates the obtained analog signal with the actual weight to obtain a relationship curve, thereby realizing real-time flow acquisition.

[0069] Display driver circuit, the display driver circuit is electrically connected to the MCU processor, and the display driver circuit converts analog signals into digital signals;

[0070] The digital tube display window is electrically connected to the display drive circuit. The analog signal of the real-time flow is converted into a digital signal by the display drive circuit and then displayed through the digital tube display window;

[0071] RS485 interface, the RS485 interface is electrically connected to the MCU processor. The MCU processor adopts the standard modbusRTU protocol and outputs the flow signal for collection by the external host computer through the RS485 interface.

[0072] It should be noted that the MCU processor, motor control circuit, DC-DC power supply circuit, solenoid valve control circuit, display drive circuit, digital tube display window, and RS485 interface can all be integrated into the control circuit board, among which the digital tube display window and RS485 interface can be set outside the first shell or the second shell.

[0073] like Figure 3 As shown, the present invention also provides a control method for a non-magnetic sandblasting and shot blasting flow valve, comprising the following steps:

[0074] (1) The control circuit board controls the stepper motor to start, and the stepper motor drives the electromagnet to descend and return to the origin through the induction origin switch;

[0075] (2) The control circuit board controls the electromagnet to be energized, generating a magnetic force to drive the pin into the pin sleeve positioning position of the permanent magnet, connecting the permanent magnet, and energizing the permanent magnet;

[0076] (3) The stepper motor drives the electromagnet to move the permanent magnet up or down;

[0077] (4) The permanent magnet drives the floating head to rise or fall through magnetic force, opens / closes the first connection port, and adjusts the opening size of the first connection port, thereby realizing the control of the opening size of the first connection port through the stepper motor;

[0078] (5) The pressing piece is deformed by the non-magnetic shot abrasive flowing out of the guide tube, and the distance sensor collects the deformation to generate an analog signal, and transmits the analog signal to the control circuit board;

[0079] (6) The control circuit board obtains the analog signal and calculates the actual flow rate of the non-magnetic abrasive through the relationship curve between the calibrated flow rate and the analog signal;

[0080] (7) The control circuit board determines whether the flow rate is within the preset range. If it is within the preset range, the control circuit board controls the stepper motor to turn off; if it is not within the preset range, the control circuit board controls the stepper motor to start and adjust the height of the floating head to stabilize the flow rate;

[0081] (8) The control circuit board controls the electromagnet to cut off power, the permanent magnet to cut off power and reset, and the floating head closes the first connection port, thereby realizing the normally closed characteristic.

[0082] It should be noted that in step (8), the control circuit board controls the electromagnet to lose power, or an abnormal power outage causes the electromagnet to lose power, the pin retracts, and the spring pushes the permanent magnet back to the initial position, thereby realizing the normally closed characteristic.

[0083] It should be noted that in step (6), the relationship curve between flow rate and analog signal is obtained by calibration. The specific steps of the calibration method are as follows:

[0084] (1) Set a certain flow rate a;

[0085] (2) Open the flow valve to allow the sand to flow through the flow valve;

[0086] (3) Obtaining sensor values;

[0087] (4) Time for one minute and weigh the actual weight flowing through;

[0088] (5) Record data: sensor value and one-minute weight;

[0089] (6) Repeat steps (1)-(5) until there are at least 5 sets of data. It is understood that the more data, the more accurate the result.

[0090] (7) Fitting the data, we can get Figure 4 The relationship curve shown.

[0091] The above are merely preferred embodiments of the present invention and do not limit the technical scope of the present invention. Therefore, any minor 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 non-magnetic sandblasting and shot blasting flow valve, characterized in that: include: The flow regulating portion includes a first housing and a motor control assembly, a solenoid valve control assembly, and a floating head fixed inside the first housing. The first housing is provided with a first connection port. The motor control assembly is used to control the power on / off of the solenoid valve control assembly and the movement of the solenoid valve control assembly. The solenoid valve control assembly is magnetically connected to the floating head when powered on. The floating head is used to open / close the first connection port and adjust the opening size of the first connection port. The flow detection portion includes a second housing, a guide tube, a pressing piece, a distance sensor, and a control circuit board. The second housing is provided with a second connection port. One end opening of the guide tube is in communication with the second connection port, and the other end opening of the guide tube faces the pressing piece. One end of the pressing piece is fixed to the inner wall of the second housing. The projection of the guide tube on the bottom of the second housing completely falls within the projection of the pressing piece on the bottom of the second housing. The distance sensor is fixed to the inner wall of the second housing. A gap is provided between the distance sensor and the pressing piece. The distance sensor and the motor control assembly are both electrically connected to the control circuit board. a flange, one end of the flange being connected to the first connection port, and the other end of the flange being connected to the second connection port; In which, the solenoid valve control assembly includes a permanent magnet, a sleeve and a spring, the permanent magnet is fixedly connected to the electromagnet, a pin sleeve is provided in the permanent magnet, the electromagnet is provided with a pin, the pin moves to be inserted into the pin sleeve, and the permanent magnet is energized; the sleeve is fixed inside the first shell, the permanent magnet is sleeved in the sleeve, the spring is sleeved in the sleeve, one end of the spring is connected to the permanent magnet, and the other end of the spring is connected to the inner wall of the first shell, the floating head is provided with a connecting rod, and the connecting rod is provided inside the sleeve.

2. The non-magnetic sandblasting and shot blasting flow valve according to claim 1, characterized in that: The motor control component includes a stepper motor, a screw, an electromagnet and an origin switch; the stepper motor is fixed inside the first shell, and the stepper motor is electrically connected to the control circuit board; the stepper motor is transmission-connected to the electromagnet through the screw; the electromagnet is electrically connected to the control circuit board, the electromagnet is fixedly connected to the solenoid valve control component, and is electrically connected to the solenoid valve control component when powered on; the origin switch is fixed inside the first shell and electrically connected to the control circuit board, and is used to determine the origin position of the electromagnet.

3. The non-magnetic sandblasting and shot blasting flow valve according to claim 1, characterized in that: The first shell is provided with a separated first accommodating chamber and a first circulation chamber, the motor control component and the solenoid valve control component are arranged in the first accommodating chamber, the floating head is arranged in the first circulation chamber, a first through hole is provided between the first accommodating chamber and the first circulation chamber, the solenoid valve control component is connected to the floating head through the first through hole, the first connection port is provided at the bottom of the first circulation chamber, and an inlet is also provided at the top of the first circulation chamber.

4. The non-magnetic sandblasting and shot blasting flow valve according to claim 1, characterized in that: The second shell is provided with a separated second accommodating chamber and a second circulation chamber, the control circuit board is provided in the second accommodating chamber, the pressing piece and the distance sensor are provided in the second circulation chamber, the second connection port is provided at the top of the second circulation chamber, and the second circulation chamber is also provided with a guide outlet at the bottom.

5. The non-magnetic sandblasting and shot blasting flow valve according to claim 1, characterized in that: The floating head has a conical structure or a combined structure of a cone and a cylinder, the first connection port has a circular shape, and the projection of the floating head on a horizontal plane completely covers the first connection port.

6. The non-magnetic sandblasting and shot blasting flow valve according to claim 1, characterized in that: The lower end opening of the guide tube is an oblique opening, the pressing sheet is arranged obliquely, and the cutting inclination of the oblique opening is the same as the cutting inclination of the pressing sheet.

7. A control circuit for a non-magnetic sandblasting and shot blasting flow valve according to any one of claims 1 to 6, characterized in that: include: MCU processor; A DC-DC power supply circuit, wherein the DC-DC power supply circuit is electrically connected to the MCU processor, and the DC24V power supply is converted into DC3.3V by the DC-DC power supply circuit to power the MCU processor; A motor control circuit, electrically connected to the MCU processor, for controlling the start / stop of the stepper motor; a solenoid valve control circuit, electrically connected to the MCU processor, for controlling the power on / off of the electromagnet; A sensing device, wherein the sensing device includes a pressing plate and a distance sensor, wherein the distance sensor is electrically connected to the MCU processor. When non-magnetic shot and abrasive material flows into the sensing device, the pressing plate produces different deformations in response to the non-magnetic shot and abrasive material with different flow rates. The distance sensor collects the deformation to generate an analog signal, and transmits the analog signal to the MCU processor. The MCU processor calibrates the obtained analog signal with the actual weight to obtain a relationship curve, thereby realizing real-time flow acquisition; a display driving circuit, wherein the display driving circuit is electrically connected to the MCU processor and converts the analog signal into a digital signal. A digital tube display window, wherein the digital tube display window is electrically connected to the display drive circuit, and the analog signal of the real-time flow rate is converted into the digital signal by the display drive circuit and then displayed through the digital tube display window; RS485 interface, the RS485 interface is electrically connected to the MCU processor, the MCU processor adopts the standard modbus RTU protocol, and outputs the flow signal for collection by the external host computer through the RS485 interface.

8. A control method for a non-magnetic sandblasting and shot blasting flow valve according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) The control circuit board controls the stepper motor to start, and the stepper motor drives the electromagnet to descend and return to the origin through the induction origin switch; (2) The control circuit board controls the electromagnet to be energized, generating a magnetic force to drive the pin into the pin sleeve positioning position of the permanent magnet, connecting the permanent magnet, and energizing the permanent magnet; (3) The stepper motor drives the electromagnet to move the permanent magnet up or down; (4) The permanent magnet drives the floating head to rise or fall through magnetic force, opens / closes the first connection port, and adjusts the opening size of the first connection port, thereby realizing the control of the opening size of the first connection port through the stepper motor; (5) The pressing piece is deformed by the non-magnetic shot abrasive flowing out of the guide tube, and the distance sensor collects the deformation to generate an analog signal, and transmits the analog signal to the control circuit board; (6) The control circuit board obtains the analog signal and calculates the actual flow rate of the non-magnetic abrasive through the relationship curve between the calibrated flow rate and the analog signal; (7) The control circuit board determines whether the flow rate is within the preset range. If it is within the preset range, the control circuit board controls the stepper motor to turn off; if it is not within the preset range, the control circuit board controls the stepper motor to start and adjust the height of the floating head to stabilize the flow rate; (8) The control circuit board controls the electromagnet to cut off power, the permanent magnet to cut off power and reset, and the floating head closes the first connection port, thereby realizing the normally closed characteristic.

9. The control method of the non-magnetic sandblasting and shot blasting flow valve according to claim 8, characterized in that: In step (8), the control circuit board controls the electromagnet to lose power, or an abnormal power outage causes the electromagnet to lose power, the pin retracts, and the spring pushes the permanent magnet back to the initial position, thereby realizing the normally closed characteristic.

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