Sand quantity adjustment device, sandblasting equipment and sand quantity adjustment method

Abstract

The present invention discloses a sand quantity regulating device, sandblasting equipment and sand quantity regulating method. The sand quantity regulating device comprises: a first end and a second end, wherein the second end is connected to a sand storage bin and / or a nozzle; an airflow regulating valve, comprising a first air inlet and a first air outlet, wherein the first air inlet is connected to the first end and the second air outlet is connected to the second end; an airflow oscillation valve, comprising a second air inlet and a second air outlet, wherein the second air inlet is connected to the first end and the second air outlet is connected to the second end. The regulating method comprises the following steps: regulating the opening of the airflow regulating valve and simultaneously regulating the power-on current frequency of the airflow oscillation valve; introducing airflow into the first end, wherein the airflow flows into the first air inlet of the airflow regulating valve and the first air inlet of the airflow oscillation valve respectively; the airflow flows out of the first air outlet of the airflow regulating valve to generate a stable airflow, and the airflow flows out of the second air outlet of the airflow oscillation valve to generate a pulsed airflow, and the stable airflow and the pulsed airflow are mixed at the second end and flow to the sand storage bin and / or the nozzle.

Description

Technical Field

[0001] The present invention relates to the technical field of sandblasting and shot blasting, and in particular to a sand quantity regulating device, sandblasting equipment and a regulating method. Background Art

[0002] In the field of micro-sandblasting, the following two methods are generally used to adjust the abrasive flow rate:

[0003] (1) Directly changing the air pressure: This method usually brings two adverse consequences: First, the sand output becomes unstable, affecting the uniformity of sandblasting; second, excessive or insufficient air pressure has a significant impact on the surface stress, roughness, glossiness and other indicators of the sandblasted workpiece, often causing the product to fail to meet the standards;

[0004] (2) Increasing the inner diameter of the sand outlet or nozzle: This method will also bring two adverse consequences: First, the abrasive flow rate increases, often causing blockage in the pipe, resulting in instability; second, by increasing the inner diameter, the flow rate will decrease under the same air pressure, thereby reducing the outlet impact force, which also affects the quality indicators of the sandblasted workpiece, requiring operators to frequently adjust repeatedly, increasing costs and defective rates. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a sand quantity adjustment device, sandblasting equipment and adjustment method, which aim to adjust the sand quantity without changing the air pressure and increasing the sand outlet or the inner diameter of the nozzle.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention discloses a sand quantity regulating device, comprising:

[0008] A first end and a second end, wherein the first end is used for air intake, the second end is used for air outlet, and the second end is connected to a sand storage bin and / or a nozzle;

[0009] an air flow regulating valve, comprising a first air inlet and a first air outlet, wherein the first air inlet is connected to the first end, and the first air outlet is connected to the second end;

[0010] The airflow oscillation valve includes a second air inlet and a second air outlet, wherein the second air inlet is connected to the first end, and the second air outlet is connected to the second end.

[0011] As a preferred solution, the airflow oscillation valve includes:

[0012] a coil, wherein an output end of the coil is electrically connected to a negative electrode of an AC power source;

[0013] a diode, one end of the diode being electrically connected to the positive electrode of the AC power supply, and the other end of the diode being electrically connected to the input end of the coil;

[0014] a flow channel, the flow channel passing through the axial hole of the coil, the second air inlet and the second air outlet being provided at both ends of the flow channel, a sealing port being provided inside the flow channel, and a sealing ring being provided at the sealing port;

[0015] A magnetic conductive frame connected to the flow channel and fixed to a side of the coil;

[0016] A magnetic valve core is arranged inside the flow channel and is located between the sealing port and the air outlet. The end of the magnetic valve core facing the second air inlet cooperates with the sealing ring to seal the sealing port. There is a gap between the side wall of the magnetic valve core and the inner wall of the flow channel.

[0017] As a preferred solution, the flow channel includes:

[0018] an intake air passage, the intake air passage comprising a first end and a second end axially opposite to each other, the first end being provided with the air inlet, the second end being provided with the sealing port, and the second end extending into the shaft hole;

[0019] The outlet flow channel includes a third end and a fourth end axially opposite to each other, the fourth end is provided with the air outlet, and the third end extends into the shaft hole and is fixedly connected to the second end.

[0020] As a preferred solution, the inlet flow channel is provided with an external thread on the outer surface of the second end, and the outlet flow channel is provided with an internal thread on the inner surface of the third end, and the external thread is threadably connected to the internal thread.

[0021] As a preferred solution, the magnetic valve core includes a sealing part, an air guiding part and an air outlet part, the sealing part, the air guiding part and the air outlet part are fixedly connected in sequence, the sealing part is adapted to the sealing port, there is a gap between the side wall of the air guiding part and the inner wall of the flow channel, and the air outlet part is used to form a gap between the air guiding part and the air outlet.

[0022] As a preferred solution, an air outlet hole is provided on the side of the air outlet portion facing the air outlet, and a plurality of air holes connected to the air outlet hole are provided on the side wall of the air outlet portion facing the inner wall of the flow channel; or, the air outlet portion includes a plurality of support rods, and the plurality of support rods are arranged circumferentially and connected to the side of the air guide portion facing the air outlet.

[0023] In a second aspect, a method for controlling the airflow oscillation valve of the sand amount regulating device comprises the following steps:

[0024] Step 1: Provide full-wave AC power to the diode, and the diode blocks the half-wave AC power in the negative half cycle.

[0025] Step 2: The half-wave alternating current of the positive half cycle flows through the coil to generate a magnetic field. The magnetic field passes through the magnetic frame to form a magnetic field loop. The magnetic valve core made of magnetic conductive material is acted upon by the magnetic force and moves toward the air inlet of the flow channel along the closing direction of the magnetic field until it moves to contact the sealing ring to seal the sealing port, completing the closure of the flow channel.

[0026] Step 3: The diode blocks the half-wave alternating current in the negative half cycle. No current flows through the coil, and the coil generates no magnetic field, so the magnetic valve core is in a non-magnetic state. There is air pressure at the air inlet of the flow channel, which pushes the magnetic valve core toward the air outlet of the flow channel, causing the magnetic valve core to separate from the sealing port. Due to the gap between the side wall of the magnetic valve core and the inner wall of the flow channel, the air flows through the gap and out of the air outlet of the flow channel, thereby completing the opening of the flow channel.

[0027] Step 4: Repeat steps 2 and 3, repeatedly closing and opening the flow channel to form pulsed airflow A and achieve airflow oscillation.

[0028] In a third aspect, the present invention further discloses a sandblasting device, comprising the above-mentioned sand quantity regulating device.

[0029] As a preferred solution, the sandblasting equipment also includes: a sand storage bin and a nozzle, the first end of the sand amount regulating device is used for air intake, the second end of the sand amount regulating device is used for air outlet, the second end of the sand amount regulating device is connected to the first interface of the first-stage three-way joint, the second interface of the first-stage three-way joint is connected to the silo of the sand storage bin, the third interface of the first-stage three-way joint is connected to the first interface of the second-stage three-way joint, the second interface of the second-stage three-way joint is connected to the sand outlet of the sand storage chamber, and the third interface of the second-stage three-way joint is connected to the nozzle.

[0030] In a fourth aspect, the present invention further discloses a sand amount adjustment method, comprising the following steps:

[0031] Step 1: Adjust the opening of the airflow regulating valve to a preset opening, and at the same time adjust the current frequency of the airflow oscillation valve to a preset current frequency;

[0032] Step 2: Airflow is introduced into the first end, and the airflow flows into the first air inlet of the airflow regulating valve and the first air inlet of the airflow oscillation valve respectively;

[0033] Step 3: The air flows out from the first air outlet of the air flow regulating valve to generate a stable air flow, and the air flows out from the second air outlet of the air flow oscillation valve to generate a pulsed air flow. The stable air flow and the pulsed air flow are mixed at the second end and then flow to the sand storage bin and / or the nozzle.

[0034] The sand quantity adjustment device, sandblasting equipment and adjustment method described in the present invention have the following beneficial effects:

[0035] After the airflow from the first end enters the first air inlet, it passes through the airflow regulating valve and becomes a stable airflow. After the airflow from the first end enters the second air inlet, it passes through the airflow oscillation valve and becomes a pulsed airflow. After the pulsed airflow and the stable airflow are mixed at the second end, the stable airflow changes the oscillation amplitude of the pulsed airflow, thereby changing the oscillation amplitude of the sand material, and then changing the flow rate of the sand material. In this process, the sand material flow rate can be adjusted without changing the air pressure or the inner diameter of the sand outlet or the nozzle. The sand amount adjustment method of the present invention can adjust the sand material flow rate without changing the air pressure or the inner diameter of the sand outlet or the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 1 is a schematic structural diagram of a sandblasting device according to an embodiment of the present invention;

[0037] Figure 2 2 is a schematic structural diagram of a sand quantity regulating device according to an embodiment of the present invention;

[0038] Figure 3 is a side view of an airflow oscillation valve according to an embodiment of the present invention;

[0039] Figure 4 is a cross-sectional view of the airflow oscillation valve in an open state according to an embodiment of the present invention;

[0040] Figure 5 is a cross-sectional view of the airflow oscillation valve in a closed state according to an embodiment of the present invention;

[0041] Figure 6 This is one of the cross-sectional views of the magnetically conductive valve core according to an embodiment of the present invention;

[0042] Figure 7 This is the second cross-sectional view of the magnetically conductive valve core according to an embodiment of the present invention;

[0043] Figure 8 This is the third cross-sectional view of the magnetically conductive valve core according to an embodiment of the present invention;

[0044] Figure 9 is a graph of pulsed airflow according to an embodiment of the present invention;

[0045] Figure 10 is a graph showing a mixture of pulsed airflow and steady airflow according to an embodiment of the present invention;

[0046] Figure 11 This is a flow regulation experiment data record table of an embodiment of the present invention;

[0047] Figure 12is a graph showing the relationship between the opening degree and flow rate of the air flow control valve according to an embodiment of the present invention;

[0048] Figure 13 It is a flow chart of the steps of the sand amount adjustment method according to an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 11. First end; 12. Second end; 13. Pressure gauge; 2. Air flow regulating valve; 21. First air inlet; 22. First air outlet; 3. Air flow oscillation valve; 31. Coil; 32. Diode; 3. Flow channel; 331. Inlet flow channel; 332. Outlet flow channel; 333. Second air inlet; 334. Second air outlet; 335. Sealing port; 34. Magnetic frame; 35. Magnetic valve core; 351. Sealing part; 352. Air guide part; 353. Air outlet part; 3531. Air outlet hole; 3532. Air hole; 3533. Support rod; 354. Reinforcement part; 36. Sealing ring; 37. Hexagonal screw; 4. First-stage tee joint; 5. Second-stage tee joint; 6. Sand storage bin; 7. Nozzle; A. Pulsed airflow; B. Steady airflow. DETAILED DESCRIPTION

[0051] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0052] like Figure 1 As shown, the present invention discloses a sand blasting equipment, including: a sand amount regulating device, a sand storage bin 6 and a nozzle 7, the first end 11 of the sand amount regulating device is used for air intake, the second end 12 of the sand amount regulating device is used for air outlet, the second end 12 of the sand amount regulating device is connected to the first interface of the first-stage tee joint 4, the second interface of the first-stage tee joint 4 is connected to the silo of the sand storage bin 6, the third interface of the first-stage tee joint 4 is connected to the first interface of the second-stage tee joint 5, the second interface of the second-stage tee joint 5 is connected to the sand outlet of the sand storage chamber, and the third interface of the second-stage tee joint 5 is connected to the nozzle 7.

[0053] It should be noted that a pressure gauge 13 may be provided at the first end 11 of the sand quantity regulating device, so that the pressure intensity of the ventilation airflow can be measured by the pressure gauge 13, so that the user can clearly know the ventilation pressure of the sandblasting equipment.

[0054] like Figure 2 As shown, the sand amount regulating device provided by the embodiment of the present invention includes:

[0055] A first end 11 and a second end 12, the first end 11 is used for air intake, the second end 12 is used for air outlet, and the second end 12 is connected to the sand storage bin 6 and / or the nozzle 7;

[0056] The air flow regulating valve 2 includes a first air inlet 21 and a first air outlet 22 , wherein the first air inlet 21 is connected to the first end 11 , and the first air outlet 22 is connected to the second end 12 ;

[0057] The airflow oscillation valve 3 includes a second air inlet 333 and a second air outlet 334 . The second air inlet 333 is connected to the first end 11 , and the second air outlet 334 is connected to the second end 12 .

[0058] After the airflow entering the first end 11 enters the first air inlet 21, it passes through the airflow regulating valve 2 and becomes a stable airflow B. After the airflow entering the first end 11 enters the second air inlet 333, it passes through the airflow oscillation valve 3 and becomes a pulsed airflow A. After the pulsed airflow A and the stable airflow B are mixed at the second end 12, the stable airflow B changes the oscillation amplitude of the pulsed airflow A, thereby changing the oscillation amplitude of the sand material, and then changing the flow rate of the sand material. In this process, there is no need to change the air pressure, and there is no need to change the inner diameter of the sand outlet or the nozzle 7 to complete the adjustment of the sand material flow rate.

[0059] like Figure 9 and Figure 10 As shown, if the sand amount regulating device only has the airflow oscillation valve 3 but no airflow regulating valve 2, when the input air pressure is 0.5 MPa, the oscillation range of the pulse airflow A is 0-0.5 MPa. If the sand amount regulating device has both the airflow oscillation valve 3 and the airflow regulating valve 2, and the input air pressure is still 0.5 MPa, the oscillation range of the airflow after the pulse airflow A and the stable airflow B are mixed is: lower limit -0.5 MPa. The lower limit value is determined by the opening of the airflow regulating valve 2, and the upper limit value is still determined by the airflow oscillation valve 3. The impact force of the airflow is also determined by the upper limit value of the airflow, so the impact force of the airflow is not reduced. At the same time, the sand flow rate can be adjusted by adjusting the opening of the airflow regulating valve 2. Because the inner diameter of the sand outlet or nozzle has not changed, and the airflow oscillation valve 3 and the airflow regulating valve 2 have no effect on the impact force, the impact force of the airflow can be maintained without changing the inner diameter of the sand outlet or nozzle while adjusting the abrasive flow rate. This avoids the problem that increasing the inner diameter of the sand outlet or nozzle will increase the abrasive flow rate, often causing blockage in the pipe and thus instability; and avoids the problem that increasing the inner diameter of the sand outlet or nozzle will reduce the flow rate under the same air pressure, thereby reducing the outlet impact force and affecting the quality indicators of the sandblasted workpiece.

[0060] like Figures 3 to 8 As shown, in some embodiments, the airflow oscillation valve 3 includes:

[0061] Coil 31, the output end of coil 31 is used to be electrically connected to the negative pole of the AC power supply;

[0062] A diode 32, one end of the diode 32 is electrically connected to the positive electrode of the AC power supply, and the other end of the diode 32 is electrically connected to the input end of the coil 31;

[0063] The flow channel 3 passes through the axial hole of the coil 31. The flow channel 3 is provided with a second air inlet 333 and a second air outlet 334 at both ends. The flow channel 3 is provided with a sealing opening 335 inside, and a sealing ring 36 is provided at the sealing opening 335.

[0064] The magnetic conductive frame 34 is connected to the flow channel 3 and fixed to the side of the coil 31;

[0065] The magnetic valve core 35 is arranged inside the flow channel 3 and is located between the sealing port 335 and the air outlet. The end of the magnetic valve core 35 facing the second air inlet 333 cooperates with the sealing ring 36 to seal the sealing port 335. There is a gap between the side wall of the magnetic valve core 35 and the inner wall of the flow channel 3.

[0066] The airflow oscillation valve 3 control method comprises the following steps:

[0067] Step 1: Provide full-wave AC power to the diode 32, and the diode 32 blocks the half-wave AC power in the negative half cycle;

[0068] Step 2: Half-wave alternating current (positive half cycle) flows through coil 31 to generate a magnetic field. This magnetic field passes through magnetic frame 34, forming a magnetic field loop. Under the influence of the magnetic force, magnetic valve core 35, made of a magnetic conductive material, moves in the direction of the magnetic field closing toward the air inlet of flow channel 3 until it contacts sealing ring 36 and seals sealing opening 335, thus closing flow channel 3.

[0069] Step 3: Diode 32 blocks the negative half-wave alternating current. No current flows through coil 31, and coil 31 generates no magnetic field. Magnetic valve core 35 is in a non-magnetic state. Air pressure is applied to the air inlet of flow channel 3, pushing magnetic valve core 35 toward the air outlet of flow channel 33. Magnetic valve core 35 is separated from sealing opening 335. Due to the gap between the side wall of magnetic valve core 35 and the inner wall of flow channel 3, air flows through the gap and out of the air outlet of flow channel 3, thereby completing the opening of flow channel 3.

[0070] Step 4: Repeat steps 2 and 3, repeatedly closing and opening flow channel 3 to form pulsed airflow A and achieve airflow oscillation.

[0071] The AC power supply generates AC power to supply power to the coil 31. Since the current of the AC power is variable, when the half-wave AC current in the positive half cycle passes through the coil 31, the coil 31 will generate a magnetic field. The magnetic field passes through the magnetic frame 34 to form a magnetic field loop. The magnetic valve core 35 is affected by the magnetic force, and the magnetic force is greater than the thrust generated by the airflow entering from the second air inlet 333. Therefore, the magnetic valve core 35 will move along the closing direction of the magnetic field toward the second air inlet 333 of the flow channel 3 until it moves to contact the sealing ring 36 to seal the sealing port 335, completing the closure of the flow channel 3. Because a diode 32 is provided between the AC power supply and the coil 31, the half-wave AC current in the negative half cycle is blocked by the diode 32. With tube 32 blocked, no current flows through coil 31 during the negative half-cycle of the alternating current, preventing coil 31 from generating a magnetic field. Consequently, magnetic valve core 35 is de-magnetized. Consequently, the thrust generated by airflow entering through second air inlet 333 propels magnetic valve core 35 toward second air outlet 334 of flow channel 3, causing magnetic valve core 35 to separate from sealing opening 335. Since magnetic valve core 35 is separated from sealing opening 335, airflow from second air inlet 333 can enter through sealing opening 335 and pass through the gap between the sidewall of magnetic valve core 35 and the inner wall of flow channel 3 to reach second air outlet 334, from where it enters the next-stage device. Because the alternating current varies periodically, magnetic valve core 35 periodically opens and closes flow channel 3, generating pulsed airflow A at second air outlet 334 and achieving airflow oscillation. Therefore, the airflow oscillation valve 3 is set in the front stage of the sand storage bin 6. The oscillating airflow passing through the sand storage bin 6 will continuously disturb the abrasive at the frequency of the airflow oscillation, increase the fluidity of the abrasive, and at the same time, the oscillating airflow will also burst out a huge instantaneous impact force, further enhancing the sandblasting impact force.

[0072] Specifically, the magnetic frame 34 is a C-shaped magnetic yoke, the two ends of which are respectively arranged at the two ends of the coil 31 and fixed on one side of the coil 31, so as to enhance the attraction force of the coil 31 and enclose the magnetic lines of force generated by the coil 31 inside to form a magnetic field loop.

[0073] Specifically, the sealing ring 36 can be made of a flexible material such as rubber or silicone, and can be elastically deformed when compressed, thereby enhancing the sealing between the magnetic valve core 35 and the sealing port 335 .

[0074] Specifically, the alternating current can be mains power (ie, AC 220V, frequency 50 Hz), or alternating current with other current strength and frequency. In this embodiment, mains power is preferably used.

[0075] It should be noted that, in some embodiments, the flow channel 3 may be an integrally formed structure.

[0076] Or, as Figure 4 and Figure 5As shown, in other embodiments, the flow channel 3 can be a split structure. In this embodiment, the flow channel 3 includes an inlet flow channel 331 and an outlet flow channel 332. The inlet flow channel 331 includes an axially opposite fifth end and a sixth end, the fifth end is provided with a second air inlet 333, the sixth end is provided with a sealing port 335, and the sixth end extends into the shaft hole; the outlet flow channel 332 includes an axially opposite third end and a fourth end, the fourth end is provided with a second air outlet 334, the third end extends into the shaft hole and is fixedly connected to the sixth end.

[0077] By setting the flow channel 3 as a split structure, the installation and disassembly of the airflow oscillation valve 3 is facilitated. During the installation process, the magnetic valve core 35 can be first installed into the outlet flow channel 332, and then the inlet flow channel 331 and the outlet flow channel 332 can be extended into the axial hole of the coil 31 for fixed connection.

[0078] Furthermore, fixing holes are provided at both ends of the magnetic frame 34. The sixth end of the inlet air duct 331 passes through the fixing hole at one end of the magnetic frame 34 and then extends into the shaft hole. The third end of the outlet air duct 332 passes through the fixing hole at the other end of the magnetic frame 34 and then extends into the shaft hole and is fixedly connected to the sixth end of the inlet air duct 331. Then, an external thread is provided at the fifth end of the inlet air duct 331 and is threadedly fixed with the hexagonal screw 37, so that the hexagonal screw 37 is in contact with one end of the magnetic frame 34, thereby completing the fixation of the magnetic frame 34.

[0079] In some embodiments, an external thread is provided on the outer surface of the sixth end of the inlet flow channel 331 , and an internal thread is provided on the inner surface of the third end of the outlet flow channel 332 , and the external thread is threadably connected to the internal thread.

[0080] The inlet flow channel 331 and the outlet flow channel 332 are connected by threads, ensuring the sealing of the connection structure between the inlet flow channel 331 and the outlet flow channel 332. Furthermore, before the inlet flow channel 331 and the outlet flow channel 332 are threadedly connected, a sealing ring 36 can be installed on the inlet flow channel 331. After the outlet flow channel 332 and the inlet flow channel 331 are threadedly connected, the sealing ring 36 is compressed, thereby further improving the sealing of the connection structure between the outlet flow channel 332 and the inlet flow channel 331.

[0081] like Figures 4 to 8 As shown, in some embodiments, the magnetic valve core 35 includes a sealing portion 351, an air guiding portion 352 and an air outlet portion 353. The sealing portion 351, the air guiding portion 352 and the air outlet portion 353 are fixedly connected in sequence. The sealing portion 351 is adapted to the sealing port 335. There is a gap between the side wall of the air guiding portion 352 and the inner wall of the flow channel 3. The air outlet portion 353 is used to form a gap between the air guiding portion 352 and the second air outlet 334.

[0082] The sealing portion 351 , the air guide portion 352 and the air outlet portion 353 may be an integrally formed structure or a separate structure. In this embodiment, the sealing portion 351 , the air guide portion 352 and the air outlet portion 353 are an integrally formed structure, thereby ensuring the structural strength of the magnetic valve core 35 .

[0083] The sealing portion 351 is adapted to the sealing port 335. When the magnetic force acting on the magnetic valve core 35 is greater than the thrust of the airflow, the magnetic valve core 35 will move toward the second air inlet 333, so that the sealing portion 351 extends into the sealing port 335 and abuts against the sealing ring 36 arranged at the sealing port 335, so that the airflow entering from the air inlet cannot pass through the sealing port 335, thereby completing the closure of the flow channel 3. When the magnetic valve core 35 is not affected by the magnetic force, the thrust of the airflow pushes the magnetic valve core 35 to move toward the second air outlet 334, so that the sealing part 351 is separated from the sealing port 335, and the airflow enters the outlet flow channel 332 through the sealing port 335. At the same time, the air outlet part 353 will abut against the fourth end of the outlet flow channel 332. Since there is a gap between the side wall of the air guide part 352 and the inner wall of the outlet flow channel 332, and the air outlet part 353 will form a gap between the air guide part 352 and the second air outlet 334, the airflow will flow to the second air outlet 334 through the gap and flow out from the second air outlet 334.

[0084] It should be noted that the magnetic valve core 35 is made of carbon steel with good magnetic permeability. In order to adapt to different intake pressures, different current intensities or different structures of the magnetic valve core 35 can be used. When using magnetic valve cores 35 with different structures, the following two structures of the magnetic valve core 35 can be used:

[0085] Specifically, if Figure 6 As shown, in some embodiments, an air outlet 3531 is provided on one side of the air outlet portion 353 facing the second air outlet 334 , and a plurality of air holes 3532 communicating with the air outlet 3531 are provided on the side wall of the air outlet portion 353 facing the inner wall of the flow channel 3 .

[0086] After the magnetic valve core 35 is separated from the sealing port 335, the airflow enters the outlet flow channel 332, passes through the gap between the side wall of the air guide portion 352 and the inner wall of the outlet flow channel 332, enters the air hole 3532, then enters the air outlet hole 3531 through the air hole 3532, and then enters the second air outlet 334 through the air outlet hole 3531, thereby completing the outflow of the air.

[0087] Specifically, if Figure 7 As shown, in some embodiments, the air outlet portion 353 includes a plurality of support rods 3533 , which are circumferentially arranged and connected to a side of the air guide portion 352 facing the second air outlet 334 .

[0088] After the magnetic valve core 35 is separated from the sealing port 335, multiple support rods 3533 abut against the fourth end of the outlet flow channel 332, so that a gap is formed between the air guide part 352 and the second air outlet 334, thereby preventing the air guide part 352 from blocking the second air outlet 334, so that the air flow entering the outlet flow channel 332 can flow out smoothly through the second air outlet 334.

[0089] Because the structure of the air outlet portion 353 is different, the weight of the magnetic valve core 35 and the size of the gap between the magnetic valve core 35 and the second air outlet 334 will be different. High air pressure also has high resistance, and a larger magnetic force is required to overcome the high resistance to close the valve. This means that the magnetic valve cores 35 with different structures mentioned above correspond to different air pressures.

[0090] If the AC power is commercial power (i.e. AC220V, frequency 50Hz), the air outlet portion 353 is a plurality of support structures suitable for an intake air pressure of 0.5-0.8Mpa, and the air outlet portion 353 is a structure of air holes 3532 and air outlet holes 3531 suitable for an intake air pressure of 0.2-0.5Mpa.

[0091] Specifically, if Figure 8 As shown, in some embodiments, the air guide portion 352 is provided as a cavity, thereby reducing the weight of the magnetic valve core 35 and enabling the magnetic valve core 35 to respond to different air pressures. It should be noted that the cavity can be cylindrical, square, or other shapes, as long as it can reduce the weight of the magnetic valve core 35.

[0092] like Figure 4 and Figure 5 As shown, in some embodiments, the sealing portion 351 is radially opposite to the coil 31 .

[0093] The sealing portion 351 is radially opposite to the coil 31, which enables the magnetic valve core 35 to be located in the magnetic field loop formed by the coil 31 and the magnetic frame 34, so that the magnetic valve core 35 can be moved toward the second air inlet 333 under the action of the magnetic force. During the movement, the air guiding portion 352 of the magnetic valve core 35 also gradually enters the magnetic field loop, thereby increasing the force area of ​​the magnetic valve core 35.

[0094] In some embodiments, the sealing portion 351 is configured to be cylindrical, the air guiding portion 352 is configured to be a polygonal column, and the interior of the flow channel 33 is configured to be a cylindrical cavity.

[0095] By configuring the interior of the flow channel 3 as a cylindrical cavity and configuring the sealing portion 351 as a cylindrical shape, the sealing portion 351 can cooperate well with the sealing ring 36 to seal the sealing opening 335 .

[0096] The air guide portion 352 is configured as a polygonal column, so there is a gap between the sidewall of the air guide portion 352 and the interior of the flow channel 3 for airflow to pass through. It is understood that the polygonal column can be a triangular column, a square column, a pentagonal column, etc. In this embodiment, a square column is preferred.

[0097] It should be noted that, when the air guide portion 352 is in the shape of a square column, the number of the support rods 3533 may be four, and the four support rods 3533 are respectively located at the four corners of the square.

[0098] like Figures 4 to 8 As shown, in some embodiments, a conical reinforcement portion 354 is provided at one end of the sealing portion 351 facing the air inlet. The reinforcement portion 354 cooperates with the sealing ring 36 to seal the sealing port 335, further enhancing the sealing performance of the magnetic valve core 35 and making the impact force of the pulse airflow A stronger.

[0099] like Figure 13 As shown, the present invention also discloses a sand amount adjustment method, comprising the following steps:

[0100] Step 1: Adjust the opening of the airflow regulating valve 2 to a preset opening, and at the same time adjust the current frequency of the airflow oscillation valve 3 to a preset current frequency;

[0101] Step 2: Airflow is introduced into the first end 11 , and the airflow flows into the first air inlet 21 of the airflow regulating valve 2 and the first air inlet 21 of the airflow oscillation valve 3 respectively;

[0102] Step 3: The air flows out from the first air outlet 22 of the air flow regulating valve 2 to generate a stable air flow B, and the air flows out from the second air outlet 334 of the air flow oscillation valve 3 to generate a pulsed air flow A. The stable air flow B and the pulsed air flow A are mixed at the second end 12 and then flow to the sand storage bin 6 and / or the nozzle 7.

[0103] Conduct flow regulation experiment on sandblasting equipment:

[0104] Experimental environment:

[0105] (1) Nozzle 7: 1.5 mm; Sand: Ceramic shot B205; Air pressure: 0.4 mPa;

[0106] (2) a small cyclone separator to separate the abrasive ejected from nozzle 7 for weighing;

[0107] (3) A precision electronic scale, accurate to 10 mg.

[0108] Experimental process:

[0109] (1) The air flow oscillation valve 3 is connected to the mains;

[0110] (2) The opening of the air flow regulating valve 2 is set to 0%, 20%, 50%, 80%, and 100% respectively;

[0111] (3) The abrasive ejected from the nozzle 7 is separated by a small cyclone separator and the gas is discharged;

[0112] (4) Each opening of the air flow control valve 2 was weighed three times, with each sampling time of 60 seconds;

[0113] (5) Calculate the flow rate and analyze the changing relationship.

[0114] After completing the above flow regulation experiment, we can get the following Figure 11 and Figure 12 By analyzing the experimental data and the relationship curve, it can be obtained that the opening of the air flow control valve 2 and the flow linearity R 2 =0.9986>99%, showing a linear relationship. As the opening of the airflow regulating valve 2 increases, the flow rate decreases. Therefore, it is concluded that the sand flow rate can be adjusted by the airflow regulating valve 2, and the opening of the airflow regulating valve 2 is negatively correlated with the flow rate.

[0115] The above description is merely a preferred embodiment of the present invention and does 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 sand quantity regulating device, characterized in that: include: A first end and a second end, wherein the first end is used for air intake, the second end is used for air outlet, and the second end is connected to a sand storage bin and / or a nozzle; an air flow regulating valve, comprising a first air inlet and a first air outlet, wherein the first air inlet is connected to the first end, and the first air outlet is connected to the second end; The airflow oscillation valve includes a second air inlet and a second air outlet, wherein the second air inlet is connected to the first end, and the second air outlet is connected to the second end.

2. The sand amount regulating device according to claim 1, characterized in that: The airflow oscillation valve comprises: a coil, wherein an output end of the coil is electrically connected to a negative electrode of an AC power source; a diode, one end of the diode being electrically connected to the positive electrode of the AC power supply, and the other end of the diode being electrically connected to the input end of the coil; a flow channel, the flow channel passing through the axial hole of the coil, the second air inlet and the second air outlet being provided at both ends of the flow channel, a sealing port being provided inside the flow channel, and a sealing ring being provided at the sealing port; A magnetic conductive frame connected to the flow channel and fixed to a side of the coil; A magnetic valve core is arranged inside the flow channel and is located between the sealing port and the air outlet. The end of the magnetic valve core facing the second air inlet cooperates with the sealing ring to seal the sealing port. There is a gap between the side wall of the magnetic valve core and the inner wall of the flow channel.

3. The sand amount regulating device according to claim 2, characterized in that: The flow channel includes: an intake air passage, the intake air passage comprising a first end and a second end axially opposite to each other, the first end being provided with the air inlet, the second end being provided with the sealing port, and the second end extending into the shaft hole; The outlet flow channel includes a third end and a fourth end axially opposite to each other, the fourth end is provided with the air outlet, and the third end extends into the shaft hole and is fixedly connected to the second end.

4. The sand amount regulating device according to claim 3, characterized in that: The inlet flow channel is provided with an external thread on the outer surface of the second end, and the outlet flow channel is provided with an internal thread on the inner surface of the third end, and the external thread is threadably connected to the internal thread.

5. The sand amount regulating device according to any one of claims 2 to 4, characterized in that: The magnetic valve core includes a sealing part, an air guiding part and an air outlet part. The sealing part, the air guiding part and the air outlet part are fixedly connected in sequence. The sealing part is adapted to the sealing port. There is a gap between the side wall of the air guiding part and the inner wall of the flow channel. The air outlet part is used to form a gap between the air guiding part and the air outlet.

6. The sand amount regulating device according to claim 5, characterized in that: An air outlet hole is provided on the side of the air outlet portion facing the air outlet, and a side wall of the air outlet portion facing the inner wall of the flow channel is provided with multiple air holes connected to the air outlet hole; or, the air outlet portion includes multiple support rods, and the multiple support rods are arranged circumferentially and connected to the side of the air guide portion facing the air outlet; the sealing portion is radially opposite to the coil.

7. A method for controlling an airflow oscillation valve in a sand quantity regulating device according to claim 1, characterized in that: The following steps are involved: Step 1: Provide full-wave AC power to the diode, and the diode blocks the half-wave AC power in the negative half cycle. Step 2: The half-wave alternating current of the positive half cycle flows through the coil to generate a magnetic field. The magnetic field passes through the magnetic frame to form a magnetic field loop. The magnetic valve core made of magnetic conductive material is acted upon by the magnetic force and moves toward the air inlet of the flow channel along the closing direction of the magnetic field until it moves to contact the sealing ring to seal the sealing port, completing the closure of the flow channel. Step 3: The diode blocks the half-wave alternating current in the negative half cycle. No current flows through the coil, and the coil generates no magnetic field, so the magnetic valve core is in a non-magnetic state. There is air pressure at the air inlet of the flow channel, which pushes the magnetic valve core toward the air outlet of the flow channel, causing the magnetic valve core to separate from the sealing port. Due to the gap between the side wall of the magnetic valve core and the inner wall of the flow channel, the air flows through the gap and out of the air outlet of the flow channel, thereby completing the opening of the flow channel. Step 4: Repeat steps 2 and 3, repeatedly closing and opening the flow channel to form pulsed airflow A and achieve airflow oscillation.

8. A sandblasting device, characterized in that: The invention comprises the sand amount regulating device according to any one of claims 1 to 6.

9. The sandblasting equipment according to claim 8, characterized in that Also includes: The sand storage bin and the nozzle, the first end of the sand amount regulating device is used for air intake, the second end of the sand amount regulating device is used for air outlet, the second end of the sand amount regulating device is connected to the first interface of the first-stage three-way joint, the second interface of the first-stage three-way joint is connected to the silo of the sand storage bin, the third interface of the first-stage three-way joint is connected to the first interface of the second-stage three-way joint, the second interface of the second-stage three-way joint is connected to the sand outlet of the sand storage chamber, and the third interface of the second-stage three-way joint is connected to the nozzle.

10. A method for adjusting the amount of sand in a sandblasting device according to claim 8, characterized in that: The following steps are involved: Step 1: Adjust the opening of the airflow regulating valve to a preset opening, and at the same time adjust the current frequency of the airflow oscillation valve to a preset current frequency; Step 2: Airflow is introduced into the first end, and the airflow flows into the first air inlet of the airflow regulating valve and the first air inlet of the airflow oscillation valve respectively; Step 3: The air flows out from the first air outlet of the air flow regulating valve to generate a stable air flow, and the air flows out from the second air outlet of the air flow oscillation valve to generate a pulsed air flow. The stable air flow and the pulsed air flow are mixed at the second end and then flow to the sand storage bin and / or the nozzle.

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