CN114434338B - Abrasive water jet system and abrasive jet cutting method - Google Patents

Abstract

The invention relates to an abrasive water jet system and an abrasive jet cutting method, wherein the jet system comprises a high-pressure alloy pipe, a nozzle is arranged at the end part of the high-pressure alloy pipe, the high-pressure alloy pipe passes through a pressure regulating cavity and a piston, the piston is fixed on the high-pressure alloy pipe, the piston is positioned in the pressure regulating cavity, the piston can slide along the axial direction of the high-pressure alloy pipe, the piston divides the interior of the pressure regulating cavity into a pressure regulating air chamber and a communicating air chamber, the pressure regulating air chamber and the communicating air chamber are sequentially close to the nozzle and are not communicated with each other, the communicating air chamber is communicated with the outside, the pressure regulating air chamber is communicated with an air inlet pipeline and an air outlet pipeline, a miniature air pump is arranged on the air inlet pipeline, and the air outlet pipeline is provided with an intelligent electromagnetic flow valve. Compared with the prior art, the special-shaped workpiece cutting machine does not need complex manual operation and calculation, and can greatly improve the cutting quality and the working efficiency of special-shaped workpieces.

Description

Abrasive water jet system and abrasive jet cutting method

Technical field

The present invention relates to the technical field of jet cutting, and in particular to abrasive water jet cutting technology.

Background technique

Abrasive water jet is a solid-liquid two-phase jet that uses water as the energy transfer medium and accelerates the formation of a solid-liquid two-phase jet by mixing abrasive particles and water. Since it officially entered the industrial manufacturing field in the 1970s, it has developed into a cold-water jet with significant advantages. state processing technology. Due to its simplicity, low cost, small cutting force and no heat-affected zone, the abrasive water jet system has been widely used in high-pressure cleaning, metal cutting, rust removal, deburring and rock crushing. By adjusting the jet pressure, abrasive concentration and particle size, nozzle diameter, moving speed and cutting target distance, the abrasive water jet can complete operations such as cutting difficult-to-machine materials and surface treatment. The adjustment of the target distance directly affects the slit width, shape, operating efficiency and slit quality. Generally speaking, the width of the slit increases as the target distance increases, and this phenomenon is more significant at relatively low jet pressure. Therefore, choosing an appropriate target distance and maintaining the stability of the target distance during the cutting process are important guarantees for the quality of abrasive waterjet cutting.

At present, most abrasive waterjet cutting operations use high-precision machine tools to control the movement of the nozzle on the horizontal X-axis and Y-axis, while the Z-axis position of the nozzle needs to be calibrated before starting the operation. In most cases, the surface to be cut is highly flat. The Z-axis is not adjusted during operation. When cutting special-shaped workpieces or rough rock surfaces, since it is impossible to know in advance the changes in the relative height of the cut surface in the cutting path, it is difficult to maintain a stable target distance during the cutting process, and when the target distance must be higher than the cut surface The maximum drop is required to avoid collision between the nozzle and the specimen, which greatly limits the promotion of abrasive waterjet cutting technology.

The existing technology proposes a concentric jet nozzle device that can realize self-adjustment of target distance for special-shaped surface processing. This device utilizes changes in the reaction force of the concentric nozzle impacting the target surface caused by changes in the concentric nozzle flow rate, and is based on the adjustment of the lever arm to achieve It achieves the effect of keeping the processing target distance stable on irregular target surfaces. However, this device cannot achieve the stability of the processing target distance when cutting uneven surfaces under constant jet pressure, and due to the small inner diameter and high pressure of the abrasive jet cutting nozzle, the processing and application of the concentric nozzle is difficult.

Contents of the invention

The purpose of the present invention is to provide an abrasive water jet system to solve the problem in the prior art of unstable target distance adjustment when cutting special-shaped workpieces; the second purpose is to propose an abrasive jet cutting method based on the abrasive water jet system. .

In order to achieve the above objects, the technical solutions adopted by the present invention are as follows:

An abrasive water jet system includes a high-pressure alloy tube with a nozzle at its end. The high-pressure alloy tube passes through a pressure regulating chamber and a piston. The piston is fixed on the high-pressure alloy tube. The piston Located inside the pressure regulating chamber, the piston can slide along the axial direction of the high-pressure alloy tube. The piston divides the inside of the pressure regulating chamber into a pressure regulating air chamber and a connecting air chamber. The pressure regulating air chamber and connected air chambers are in turn close to the nozzle and are not connected to each other. The connected air chamber is connected to the outside. The pressure regulating air chamber is connected to both the air intake pipeline and the exhaust pipeline. A micro air pump is provided on the air intake pipeline. , the exhaust pipeline is equipped with an intelligent electromagnetic flow valve. When the nozzle tends to move closer to the pressure regulating chamber, the electromagnetic flow valve discharges a preset quality of gas. When the nozzle moves away from the When the direction of the pressure regulating chamber moves, the micro air pump injects a preset quality of gas to make the air pressure inside the pressure regulating air chamber constant.

According to the above technical means, when the nozzle has an instantaneous tendency to move away from the pressure regulating chamber, the air pressure and volume inside the pressure regulating air chamber remain unchanged, and the reaction force generated by the jet is less than the air pressure inside the pressure regulating air chamber, and thus It means that the distance between the cutting position and the nozzle at the next moment becomes larger. In order to ensure the constant target distance, it is necessary to start the micro air pump and inject the preset quality of gas into the pressure regulating air chamber. The preset quality of gas will push the piston towards the special-shaped workpiece. Directional movement, when the air pressure in the pressure regulating chamber returns to the initial state, it means that the reaction force generated by the jet is balanced with the air pressure in the pressure regulating chamber, thereby completing the adjustment of the target distance; when the nozzle generates a direction close to the pressure regulating chamber At the instant of movement, the air pressure and volume inside the pressure-regulating air chamber remain unchanged, and the reaction force generated by the jet is less than the air pressure inside the pressure-regulating air chamber, which means that the distance between the cutting position and the nozzle becomes smaller. In order to ensure the target distance Constant, it is necessary to start the electromagnetic flow valve to discharge the preset quality of gas, thereby moving the nozzle towards the direction close to the pressure regulating chamber, so that the piston can compress the volume of the pressure regulating air chamber. When the air pressure in the pressure regulating air chamber returns to the initial state, it means The reaction force generated by the jet is balanced with the air pressure in the pressure-regulating air chamber, thereby completing the adjustment of the target distance. Through the above process, the stability of the target distance is achieved.

Furthermore, it also includes an ultrasonic sensor and a control center. The ultrasonic sensor, the micro air pump and the intelligent electromagnetic flow valve are all electrically connected to the control center. The ultrasonic sensor is used to detect the cutting at the next moment in real time. The distance between the position and the ultrasonic sensor, the control center starts the intelligent electromagnetic flow valve or micro air pump according to the detection result of the ultrasonic sensor.

According to the above technical means, the distance of the cutting position at the next moment can be predicted based on the ultrasonic sensor, further improving the accuracy of adjusting the target distance.

Further, the ultrasonic sensor is spaced apart from the nozzle.

Avoid the impact of the fragments after jet cutting on the ultrasonic sensor.

Further, a pressure sensor is provided in the pressure regulating air chamber for measuring the air pressure inside the pressure regulating air chamber. The pressure sensor, micro air pump, intelligent electromagnetic flow valve, and ultrasonic sensor are all electrically connected to the control center.

Further, a buffer spring is installed on the inner wall of the communicating air chamber, and the high-pressure alloy tube passes through the inner wall.

According to the above technical means, impact damage between the piston and the pressure regulating chamber caused by excessive air pressure in the pressure regulating air chamber is avoided.

Further, a protective baffle is provided, the protective baffle is provided with a through hole, the high-pressure alloy tube passes through the through hole, and the diameter of the high-pressure alloy tube is smaller than the aperture of the through hole.

According to the above technical means, water fragments after the impact jet are prevented from damaging the pressure regulating chamber and other components.

Further, the high-pressure alloy pipe is provided with a limiting block, the limiting block extends toward the radial direction of the high-pressure alloy pipe, and the limiting block is located between the protective baffle and the pressure regulating chamber.

Further, the intake pipeline is provided with a first one-way valve, and the exhaust pipeline is provided with a second one-way valve.

According to the above technical means, the air tightness in the pressure regulating air chamber is ensured.

An abrasive jet cutting method based on an abrasive water jet system. The method is specifically:

A calibration plate is set in front of the nozzle to calibrate the initial state of the abrasive water jet system. The initial state of the abrasive water jet system is specifically: the air pressure in the pressure regulating air chamber is p ₀ ; the mass of the gas in the pressure regulating air chamber is M ₁ ; The distance between the piston and the inner surface of the pressure regulating air chamber along the axial direction of the high-pressure alloy tube is h, where the distance between the piston and the inner surface of the pressure regulating air chamber along the axial direction of the high-pressure alloy tube is smaller than the distance between the high-pressure alloy tube inside the pressure-regulating chamber and the inner surface of the pressure-regulating chamber along the axial direction of the high-pressure alloy tube. The length of the tube in the axial direction;

Place the ultrasonic sensor at the position of the nozzle so that the jet ejected from the nozzle is in front of the ultrasonic sensor. Use the ultrasonic sensor to measure the distance between the ultrasonic sensor and the calibration plate, and calibrate the distance to 0 in the control center;

Replace the special-shaped workpiece with the calibration plate, enter the cutting movement speed, target distance, jet pressure and abrasive concentration in the control center, start the abrasive water jet system, and the jet ejected from the nozzle gradually moves from the starting position of the special-shaped workpiece to the end position of the piece to be cut , complete the cutting. During the cutting process, the ultrasonic sensor continuously transmits the height change information Δh on the cutting path of the special-shaped workpiece to the control center;

During the cutting process, the abrasive water jet system starts a response mechanism. The response mechanism is specifically: if Δh>0, the micro air pump injects a preset quality of gas, and the piston moves in the direction close to the part to be cut, so that the pressure in the regulating air chamber The air pressure of is p ₀ ; if Δh < 0, the electromagnetic flow valve discharges the preset mass of gas, and the piston moves in the direction away from the part to be cut, so that the air pressure in the pressure regulating air chamber is p ₀ ; if Δh = 0, then the piston at the initial position.

Further, the preset quality is specifically expressed as:

M＝M ₁ *(|Δh|/h);

Where: M represents the preset quality.

Beneficial effects of the present invention:

Compared with the existing technology, this invention uses ultrasonic sensors, control centers and pressure regulating chambers to sense height changes on the cutting path in advance, and automatically adjusts the position of the nozzle to ensure that the target distance remains stable when the abrasive jet cuts uneven workpieces, without the need for Complex manual operations and calculations can greatly improve the cutting quality and operating efficiency of special-shaped workpieces.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a partial enlarged view of part A in Figure 1.

Among them, 1-nozzle; 2-high-pressure alloy tube; 3-piston; 4-pressure regulating chamber; 5-exhaust pipe; 6-intelligent electromagnetic flow valve; 7-second one-way valve; 8-inlet pipe; 9- The first one-way valve; 10-micro air pump; 11-high pressure hose; 12-joint; 13-control center; 14-ultrasonic sensor; 15-protective baffle; 16-special-shaped workpiece; 17-limit block; 18- Anti-collision rubber pad; 19-connected air chamber; 20-pressure regulating air chamber; 21-buffer spring; 22-constant pressure hole.

Detailed ways

The implementation of the technical solution of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention.

It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the drawings only show the components related to the present invention and do not follow the number, shape and number of components during actual implementation. Dimension drawing, in actual implementation, the type, quantity and proportion of each component can be arbitrarily changed, and the component layout type may also be more complex.

This embodiment proposes an abrasive water jet system, as shown in Figures 1 and 2, including a high-pressure alloy pipe 2, a nozzle 1 threadedly connected to one end of the high-pressure alloy pipe 2, a joint 12 installed at the other end, and a high-pressure hose 11 The joint 12 is connected to the interior of the high-pressure alloy pipe 2 so that the jet inside the high-pressure hose 11 can be ejected through the nozzle 1 .

The abrasive water jet system also includes a piston 3 and a pressure regulating chamber 4. The piston 3 is located inside the pressure regulating chamber 4. The high-pressure alloy tube 2 passes through the pressure regulating chamber 4 and the piston 3. The piston 3 is fixed on the high-pressure alloy tube 2 and connected with the pressure regulating chamber 4. The high-pressure alloy tube 2 is rigidly connected so that the piston 3 can slide back and forth in the axial direction of the high-pressure alloy tube 2 driven by the high-pressure alloy tube 2. The piston 3 separates the interior of the pressure regulating chamber 4 into a connected air chamber 19 and a pressure regulating gas chamber. Chamber 20, the inner wall of the piston 3 and the pressure regulating chamber 4 are slidingly sealed to prevent the communicating air chamber 19 from connecting with the pressure regulating air chamber 20. A constant pressure hole 22 is provided in the communicating air chamber 19 to ensure that the communicating air chamber 19 is always connected to the outside. The air pressure in the communicating air chamber 19 is maintained at 1 atmospheric pressure. The connecting air chamber 19 and the pressure-regulating air chamber 20 are located away from the nozzle 1 in sequence. The positions where the high-pressure alloy tube 2 passes through the pressure-regulating chamber 4 are provided with sealing rubber rings to further ensure the sealing inside the pressure-regulating air chamber 20.

The pressure regulating air chamber 20 is connected to both the exhaust pipe 5 and the air inlet pipe 8. The air inlet end of the air intake pipe 8 is connected to the micro air pump 10. A first one-way valve 9 is provided on the air inlet pipe 8 so that the pressure regulating air chamber 20 The gas inside cannot be discharged from the air inlet pipe 8. At the same time, the gas can only be injected into the pressure regulating air chamber 20 through the micro air pump 10. The exhaust pipe 5 is equipped with an intelligent electromagnetic flow valve 6. Between the intelligent electromagnetic flow valve 6 and the exhaust pipe 5 There is a second one-way valve 7 between the gas inlet ends. When the intelligent electromagnetic flow valve 6 is opened, the gas in the pressure regulating air chamber 20 can only be discharged through the second one-way valve 7, and the external gas cannot pass through the second one-way valve 7. The one-way valve 7 enters the pressure regulating air chamber 20, and the piston 3 is driven by the pressure difference between the jet reverse thrust and the gas in the pressure regulating air chamber 20. The pressure regulating air chamber 20 is provided with a pressure sensor for measuring the static pressure in the pressure regulating air chamber 20 in real time.

The high-pressure alloy pipe 2 passes through the through hole of the protective baffle 15. The diameter of the through hole is larger than the diameter of the high-pressure alloy pipe 2. The protective baffle 15 is not directly connected to the abrasive jet target distance intelligent control system to avoid adding additional To resist and prevent equipment damage caused by abrasive backlash, the gap between the high-pressure alloy tube 2 and the protective baffle 15 is covered with a soft rubber strip.

A buffer spring 21 is provided on the inner wall of the communicating air chamber 19, and the high-pressure alloy tube 2 passes through the inner wall to prevent the piston 3 from directly colliding with the inner wall of the pressure regulating air chamber 20 due to excessive pressure in the pressure regulating air chamber 20, thereby causing impact damage.

A limiting block 17 is provided on the high-pressure alloy pipe 2. The limiting block 17 extends toward the radial direction of the high-pressure alloy pipe 2. The limiting block 17 is located between the pressure regulating chamber 4 and the protective baffle 15 to prevent the pressure regulating air chamber 20 from being Excessive air pressure inside causes the pressure regulating chamber 4 to collide with the protective baffle 15, and at the same time, the pressure regulating chamber 4 is in position limit.

The abrasive water jet system also includes an ultrasonic sensor 14 and a control center 13. The ultrasonic sensor 14 is used to measure the distance between each position of the nozzle 1 and the special-shaped workpiece 16. The control center 13 is equivalent to a controller, and is connected with the intelligent electromagnetic flow valve 6, pressure The sensor, ultrasonic sensor 14 and micro air pump 10 are all electrically connected.

The process of jet cutting operations using an abrasive waterjet system is:

Before carrying out abrasive jet cutting operations, it is necessary to calibrate the initial status of each component of the abrasive water jet system, specifically:

Place the calibration plate in front of the nozzle 1, and fit the front end of the piston 3 with the buffer spring 21. Set the pressure of the pressure regulating air chamber 20 to 1 atmosphere, close the intelligent electromagnetic flow valve 6, and input the jet pressure and target into the control center 13. distance and abrasive concentration, jet pressure, target distance and abrasive concentration are consistent with the parameters during cutting operations, and then the abrasive water jet system is turned on. At this time, the abrasive and water mixture flows from the high-pressure hose 11 through the joint 12 and the high-pressure alloy pipe 2 from the nozzle 1 is ejected and onto the calibration plate. The piston 3 moves backward under the action of the reverse thrust of the jet and squeezes the air in the pressure regulating air chamber 20. The air pressure in the pressure regulating air chamber 20 is measured by a pressure sensor. And transmit it to the control center 14. After the pressure stabilizes, it is recorded that the pressure of the pressure regulating air chamber 20 is P ₀ at this time. At this time, the control center 14 exhausts the air through the intelligent electromagnetic flow valve 6 or injects gas through the micro air pump 10 to change the pressure regulating air. The amount of air in the chamber 20 is such that the piston 3 is located in the middle of the pressure regulating chamber 4. The pressure in the pressure regulating chamber 20 still maintains P ₀ . Turn on the ultrasonic sensor 14 and measure the target distance and the mass M ₁ of the gas at this time and input them into the control center 14 , and then calibrate the target distance detected at this time to 0 in the control center 14, then close the abrasive jet generation system, take away the calibration plate, and complete the calibration.

After calibrating the initial state of the abrasive water jet system, the calibration plate is replaced with the special-shaped workpiece 16 to be cut. The cutting direction is shown in the direction of the arrow on the left side of Figure 1. In this embodiment, the ultrasonic sensor 14 is connected to the high-pressure alloy tube 2 Arranged at intervals, the interval is L to avoid impact damage to the ultrasonic sensor 14 by the cut gravel, and when the nozzle 1 moves along the cutting direction, the ultrasonic sensor 14 and the protective baffle 15 move synchronously with the nozzle 1, and The ultrasonic sensor 14 and the high-pressure alloy pipe 2 maintain an equal vertical distance.

First, 4. Keep the axial position of the ultrasonic sensor 14 in the high-pressure alloy pipe 2 unchanged when the initial state of the calibrated abrasive water jet system is maintained, only change the radial position of the ultrasonic sensor 14, and place the ultrasonic sensor 14 in the initial cutting of the special-shaped workpiece 16 position, and turn on the ultrasonic sensor 1 to start distance measurement, and then move slowly along the cutting direction. The ultrasonic sensor 14 continues to transmit the height change information Δh on the cutting path of the special-shaped workpiece 16 to the control center 13 in real time until the ultrasonic sensor 1 moves a distance L When, the nozzle 1 reaches the initial position of cutting, the nozzle 1 starts to spray a high-pressure jet to cut the heterogeneous workpiece 16 along the cutting direction. At the same time, the control center 13 starts a response mechanism after the nozzle 1 moves a distance of L. The response mechanism is specifically: when When Δh<0, in order to maintain the stability of the target distance, the nozzle needs to be moved a certain distance in the positive direction of the Z axis. Therefore, the control center 13 controls the intelligent electromagnetic flow valve 6 to discharge the mass to M ₁ *(|Δh|/h) After the exhaust is completed, the intelligent electromagnetic flow valve 24 automatically closes. At this time, the air pressure in the pressure regulating air chamber 20 decreases, the jet reverse thrust remains unchanged, and the pressure regulating piston 5 moves in the positive direction of the z-axis under the action of the pressure gradient force. The pressure balance is just reached when the moving distance Δh is reached, the nozzle retreat adjustment is completed, and the air pressure in the pressure regulating air chamber 20 returns to P ₀ ; when Δh>0, the intelligent electromagnetic flow valve 24 remains closed, and the control center 13 controls the micro air pump 10 towards Gas is injected into the pressure regulating air chamber 20, thereby increasing the internal air pressure of the pressure regulating air chamber 20. The mass of the injected gas is M ₁ *(|Δh|/h). After the injection is completed, the micro air pump 110 is closed. At this time, the piston 3 It moves along the negative direction of the Z-axis under the action of the pressure gradient force. When the moving distance reaches Δh, the pressure in the pressure regulating chamber air chamber returns to P ₀ . The piston 3 stops moving due to the pressure balance on both sides, completing the nozzle forward adjustment. The entire During the process, the communication chamber is connected to the atmosphere through the constant pressure hole 28, and the pressure is constant at 1 atmosphere. The height of the nozzle 1 can be automatically adjusted according to the fluctuation of the surface of the special-shaped workpiece 19, ensuring the stability of the target distance during the operation.

After cutting is completed, the abrasive jet generation system is closed, the intelligent electromagnetic flow valve 6 is opened through the control center 13 to release the high-pressure air in the pressure regulating air chamber 20, and the micro air pump 10, ultrasonic sensor 14 and pressure sensor are closed for next use.

The above embodiments are only preferred embodiments to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention.

Claims (2)

1. A method of cutting an abrasive jet, characterized by: the method specifically comprises the following steps:

the method comprises the steps that a calibration flat plate is arranged in front of a spray head, and the initial state of an abrasive water jet system is calibrated, wherein the initial state of the abrasive water jet system is specifically as follows: the air pressure in the pressure-regulating chamber isThe method comprises the steps of carrying out a first treatment on the surface of the The mass of the gas in the pressure-regulating chamber is +.>The distance between the piston and the inner side surface of the pressure regulating chamber along the axial direction of the high-pressure alloy pipe is h, wherein the distance between the piston and the inner side surface of the pressure regulating chamber along the axial direction of the high-pressure alloy pipe is smaller than the length of the pressure regulating chamber along the axial direction of the high-pressure alloy pipe;

placing an ultrasonic sensor at the position of the spray head, so that the jet flow sprayed out of the spray head is positioned in front of the ultrasonic sensor, measuring the distance between the ultrasonic sensor and the calibration flat plate through the ultrasonic sensor, and calibrating the distance to be 0 in a control center;

the method comprises the steps of replacing a calibration flat plate with a special-shaped workpiece, inputting cutting movement speed, target distance, jet pressure and abrasive concentration in a control center, starting an abrasive water jet system, gradually moving jet ejected by a jet head from the starting point position of the special-shaped workpiece to the end point position of a workpiece to be cut, and finishing cutting, wherein in the cutting process, an ultrasonic sensor continuously sends height change information on a cutting path of the special-shaped workpieceThrough transmission to a control center;

during the cutting process, the abrasive water jet system starts a response mechanism, which is specifically: if it isThe micro air pump injects the air with preset mass, and the piston moves towards the direction close to the piece to be cut, so that the air pressure in the pressure regulating chamber is +.>The method comprises the steps of carrying out a first treatment on the surface of the If->The electromagnetic flow valve discharges the gas with preset mass, and the piston moves towards the direction far away from the workpiece to be cut, so that the air pressure in the pressure regulating chamber is +.>The method comprises the steps of carrying out a first treatment on the surface of the If->The piston is located at the initial state;

the method is based on an abrasive water jet system and comprises a high-pressure alloy pipe, wherein a spray head is arranged at the end part of the high-pressure alloy pipe, the high-pressure alloy pipe penetrates through a pressure regulating cavity and a piston, the piston is fixed on the high-pressure alloy pipe, the piston is positioned in the pressure regulating cavity, the piston can slide along the axial direction of the high-pressure alloy pipe, the piston divides the interior of the pressure regulating cavity into a pressure regulating air chamber and a communicating air chamber, the pressure regulating air chamber and the communicating air chamber are sequentially close to the spray head and are not communicated with each other, the communicating air chamber is communicated with the outside, the pressure regulating air chamber is communicated with an air inlet pipeline and an air outlet pipeline, a micro air pump is arranged on the air inlet pipeline, an electromagnetic flow valve is arranged on the air inlet pipeline, when the spray head generates a trend of moving in the direction close to the pressure regulating cavity, the electromagnetic flow valve discharges gas with preset mass, and when the spray head generates a trend of moving in the direction far away from the pressure regulating cavity, the micro air pump injects the gas with preset mass, so that the air pressure inside the pressure regulating air chamber is constant.

2. The method of abrasive jet cutting according to claim 1, wherein: the preset mass is specifically expressed as:

；

wherein: m represents the preset mass.