An abrasive concentration automatic adjusting system and adjusting method

Abstract

The application belongs to the field of mechanical abrasive jet, and discloses an abrasive concentration automatic adjusting system, which comprises an abrasive jet device, a quality monitor and a data processing center, and further discloses an abrasive concentration adjusting method using the abrasive concentration automatic adjusting system, which comprises the following steps: S1, performing abrasive water jet operation, wherein the data processing center automatically calculates the current abrasive mass concentration C0 and compares it with the user input abrasive mass concentration C1 during the abrasive water jet operation; S2, storing the real-time working condition parameters, abrasive related information and servo proportional throttle valve opening calibration condition during the abrasive water jet operation in the data processing center; and S3, performing cleaning operation on the abrasive concentration automatic adjusting system for next use. Through the automatic adjusting system and the adjusting method, the user can directly set the required abrasive mass concentration parameters, and the system can be automatically calibrated with high parameter precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical abrasive jet, in particular to an abrasive concentration automatic adjusting system and adjusting method. BACKGROUND

[0002] Abrasive water jet is a kind of highly energy-concentrated high-speed jet formed by liquid-solid two-phase fluid of abrasive particles and water accelerated through a nozzle. The abrasive water jet was first studied in the United States, mainly applied in oil drilling. Large-scale research and practical application of the technology began in the late 1970s, and rapidly developed in the 1980s. Abrasive water jet has the advantages of high cutting precision, no heating, environmental protection and dust-free, and has been widely used in metallurgy, machinery, petroleum, coal, aviation, construction and light industry fields, mainly for cutting, crushing and cleaning operations. According to the different mixing methods, the abrasive water jet can be divided into front-mixed abrasive water jet and rear-mixed abrasive water jet. The rear-mixed abrasive water jet has low energy transmission efficiency of water to abrasive because the abrasive cannot be fully turbulent mixed with high-speed water flow. In order to improve the energy transmission efficiency and improve the abrasive acceleration effect, the front-mixed abrasive water jet technology is developed. This technology fully mixes with water under low pressure and then enters the high-speed water flow, thereby greatly improving the energy transmission efficiency. However, due to the abrasive mixing and acceleration process being carried out in a closed and pressurized environment, it is difficult to accurately adjust and control the mass flow of abrasive during operation, which has seriously affected the development of front-mixed abrasive water jet technology.

[0003] At present, in the research on the control of abrasive mass flow of abrasive water jet, the methods of controlling the rotation speed of screw push or manually controlling the opening degree of abrasive tank valve are often used to control the abrasive supply speed. The screw push technology has problems such as abrasive sedimentation and screw jamming in abrasive water jet. Manual control of abrasive tank valve opening degree can only change the size of abrasive supply speed, but cannot accurately control the abrasive mass concentration, and the valve core wears quickly. SUMMARY

[0004] The present application provides an abrasive concentration automatic adjusting system and adjusting method, which can directly input the required abrasive mass concentration parameters for operation, accurately control the abrasive mass flow in abrasive water jet operation, and does not need manual calculation.

[0005] The present application is realized by the following technical solutions:

[0006] An abrasive concentration automatic adjusting system, comprising:

[0007] An abrasive jet device, comprising an abrasive tank, a liquid supply mechanism, an abrasive particle supply mechanism, a sediment pool and a nozzle assembly, a valve seat is installed on the top of the abrasive tank, the liquid supply mechanism is connected with the valve seat through a first pipeline and / or a second pipeline, the abrasive particle supply mechanism is arranged on the first pipeline, the sediment pool is connected with the valve seat through a third pipeline, the bottom of the abrasive tank is connected with one input end of a mixing chamber through a fourth pipeline, the other input end of the mixing chamber is connected with the second pipeline, the output end of the mixing chamber is connected with the nozzle assembly through a fifth pipeline;

[0008] A mass monitor horizontally arranged at the bottom of the abrasive tank and the abrasive particle supply mechanism for detecting the mass change of the abrasive tank and the abrasive particle supply mechanism during the abrasive water jet operation;

[0009] A data processing center electrically connected with the liquid supply mechanism, the abrasive particle supply mechanism and the mass monitor for receiving the mass difference signal of the mass monitor and performing corresponding control on the liquid supply mechanism and the abrasive particle supply mechanism so as to automatically adjust the abrasive concentration in the abrasive tank.

[0010] As an optimization, the liquid supply mechanism comprises a water storage pool, a plunger pump and an electronic flowmeter, the input end of the plunger pump is connected with the water storage pool through a pipeline, the plunger pump and the electronic flowmeter are connected on a main pipeline, the main pipeline is divided into the first pipeline and the second pipeline, the end of the first pipeline away from the main pipeline is connected with the valve seat, the second electrically controlled pneumatic high-pressure valve, the abrasive particle supply mechanism and the fourth electrically controlled pneumatic high-pressure ball valve are arranged on the first pipeline in sequence along the water flow direction, the first electrically controlled pneumatic high-pressure ball valve is arranged in series on the second pipeline, the end of the second pipeline away from the main pipeline is divided into a first branch pipeline and a second branch pipeline, the first branch pipeline is connected with the valve seat through a servo proportional throttle valve, the second branch pipeline is connected with the mixing chamber through a seventh electrically controlled pneumatic high-pressure ball valve, the data processing center is electrically connected with the servo proportional throttle valve, the plunger pump, the electronic flowmeter, the first electrically controlled pneumatic high-pressure ball valve, the second electrically controlled pneumatic high-pressure valve, the fourth electrically controlled pneumatic high-pressure ball valve and the seventh electrically controlled pneumatic high-pressure ball valve.

[0011] As an optimization, the abrasive particle supply mechanism comprises a feeding hopper, the output end of the feeding hopper is communicated with the first pipeline through a third electrically controlled pneumatic high-pressure ball valve and a jet pump in sequence, the third electrically controlled pneumatic high-pressure ball valve and the jet pump are electrically connected with the data processing center.

[0012] As an optimization, a fifth electrically controlled pneumatic high-pressure ball valve is arranged on the fourth pipeline, the fifth electrically controlled pneumatic high-pressure ball valve is electrically connected with the data processing center.

[0013] As optimization, one end of the third pipeline extending from the valve seat is bifurcated into a third branch pipeline and a fourth branch pipeline, one end of the third branch pipeline away from the valve seat is arranged above the sedimentation tank, one end of the fourth branch pipeline away from the valve seat is arranged in the sedimentation tank, a first safety valve for pressure relief is arranged in series on the third branch pipeline, a sixth electrically-controlled pneumatic high-pressure ball valve is arranged on the fourth branch pipeline, and the first safety valve and the sixth electrically-controlled pneumatic high-pressure ball valve are electrically connected with the data processing center.

[0014] As optimization, a total pipeline between the plunger pump and the electronic flow meter is connected with one end of a second safety valve, the other end of the second safety valve is arranged above the water storage tank, and the second safety valve is electrically connected with the data processing center.

[0015] The application further discloses a method for adjusting abrasive concentration by using the abrasive concentration automatic adjusting system.

[0016] S1, abrasive water jet operation is performed, the data processing center automatically calculates a current abrasive mass concentration C0 during the abrasive water jet operation, compares the current abrasive mass concentration C0 with a user-input abrasive mass concentration C1, then calculates a current error a1, and if the current error a1 is greater than an error threshold a, the data processing center adjusts a servo proportional throttle valve to control the abrasive mass concentration until the current error a1 is less than the error threshold a.

[0017] S2, real-time working condition parameters, abrasive related information and servo proportional throttle valve opening calibration conditions during the abrasive water jet operation are stored in the data processing center, so as to be used for data viewing and analysis after the abrasive water jet operation is completed, and to be directly called in subsequent abrasive water jet operations.

[0018] S3, the abrasive concentration automatic adjusting system is cleaned for next use.

[0019] As optimization, the specific steps of S1 are as follows:

[0020] S1.1, water filling operation is performed on the abrasive concentration automatic adjusting system, and a first mass parameter m0 is recorded by a mass monitor after the abrasive concentration automatic adjusting system is filled with water;

[0021] S1.2, abrasive particles are added to a feeding hopper, at this time, a second mass parameter m1 is recorded by the mass monitor, and the mass m2 of the abrasive particles in the feeding hopper is calculated by the data processing center, m2=m1-m0;

[0022] S1.3, abrasive automatic feeding operation is performed, a third mass parameter m3 is recorded by the mass monitor after the abrasive tank is filled with abrasive particles, and the mass m of the abrasive particles in the abrasive tank is calculated, m=m3-m2.m ;

[0023] S1.4, performing abrasive water jet operation, abrasive water is sprayed from the nozzle assembly through the fifth pipeline, and the average mass concentration Co of abrasive particles in a certain period of abrasive water jet operation is calculated by recording the detected mass difference of the mass monitor and the flow difference recorded by the electronic flow meter, and after the abrasive water jet operation is completed, the sixth mass parameter m6 is obtained by the mass monitor, and the total mass M of the abrasive particles used in the abrasive water jet operation is calculated by the data processing center;

[0024] S1.5, according to the user input abrasive particle mass concentration C1, the average mass concentration Co of abrasive particles in a certain period of abrasive water jet operation, and the current opening degree x0 of the servo proportional throttle valve, the opening degree x1 of the servo proportional throttle valve corresponding to the user input abrasive mass concentration C1 is calculated, adjusting the servo proportional throttle valve to the opening degree x1 to regulate the abrasive concentration;

[0025] S1.6, detecting the regulated abrasive mass concentration C2, according to the formula the current error a1 is calculated and compared with the error threshold a, if the current error a1 is less than the error threshold a, the calibration is ended, otherwise, the abrasive mass concentration C2 is assigned to the average mass concentration Co, and returns to S1.5.

[0026] As an optimization, the mass m m of the abrasive particles in the abrasive tank is calculated by the formula:

[0027] m m =(m1-m3)×ρ2 / ρ1;

[0028] Wherein, ρ1 is the density of water, and ρ2 is the density of abrasive particles.

[0029] As an optimization, in S1.5, the average mass concentration Co of abrasive particles in a certain period of abrasive water jet operation is calculated by the formula:

[0030]

[0031] Wherein, m4 and m5 are the fourth mass parameter and the fifth mass parameter monitored by the mass monitor at the beginning and the end of a certain period of time, Q1 and Q2 are the first flow parameter and the second flow parameter monitored by the electronic flow meter at the beginning and the end of a certain period of time, wherein the time period corresponding to m4 and m5 and Q1 and Q2 is the same time period.

[0032] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0033] Through the automatic adjusting system and adjusting method, the user can directly set the required abrasive mass concentration parameter, the system can be automatically calibrated, the parameter precision is high, and manual calculation is not required; the data processing center automatically saves the abrasive parameters of common types and particle sizes, and the abrasive water jet operation of a specific abrasive mass concentration can be directly performed under the same test working condition, thereby greatly improving the operation efficiency; the parameters required by the abrasive mass flow automatic regulating system are obtained through an electronic flow meter and a precision mass monitor, the automatic regulating action of the abrasive mass flow is performed through the servo proportional throttle valve on the pure water pipeline, the abrasive mass concentration automatic regulating process does not directly contact the abrasive, and the system reliability and service life are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without paying creative labor on the premise that the drawings are not limited. In the drawings:

[0035] Figure 1 The structure schematic diagram of the abrasive concentration automatic adjusting system is shown in the drawings.

[0036] The marks in the drawings and the corresponding names of the parts are as follows:

[0037] 1-plunger pump; 2-electronic flow meter; 3-first electrically controlled pneumatic high-pressure ball valve; 4-second electrically controlled pneumatic high-pressure ball valve; 5-jet pump; 6-third electrically controlled pneumatic high-pressure ball valve; 7-feed hopper; 8-servo proportional throttle valve; 9-fourth electrically controlled pneumatic high-pressure ball valve; 10-first safety valve; 11-abrasive tank; 12-mass monitor; 13-settling tank; 14-mixing chamber; 15-main pipeline; 16-second pipeline; 17-first pipeline; 18-third branch pipeline; 19-nozzle assembly; 20-valve seat; 21-fifth pipeline; 22-second safety valve; 23-water reservoir; 24-fifth electrically controlled pneumatic high-pressure ball valve; 25-fourth pipeline; 26-sixth electrically controlled pneumatic high-pressure ball valve; 27-high-pressure water inlet; 28-fourth branch pipeline; 29-data processing center; 30-first data transmission line; 31-second data transmission line; 32-seventh electrically controlled pneumatic high-pressure ball valve; 33-first branch pipeline; 34-second branch pipeline; 35-third data transmission line. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application will be further described in detail below in combination with the embodiments and drawings, the exemplary embodiments of the present application and the description thereof are only used to explain the present application, and should not be regarded as a limitation on the present application.

[0039] Embodiment 1

[0040] An abrasive concentration automatic adjusting system comprises:

[0041] An abrasive jet device comprises an abrasive tank 11, a liquid supply mechanism, an abrasive particle supply mechanism, a sedimentation tank 13 and a nozzle assembly 19, a valve seat 20 is installed on the top of the abrasive tank 11, the liquid supply mechanism is connected with the valve seat 20 through a first pipeline 17 and / or a second pipeline 16, the abrasive particle supply mechanism is arranged on the first pipeline 17, the sedimentation tank 13 is connected with the valve seat 20 through a third pipeline, the bottom of the abrasive tank 11 is connected with one input end of a mixing chamber 14 through a fourth pipeline 25 for providing uniform fluidized abrasive for the mixing chamber 14, the other input end of the mixing chamber 14 is connected with the second pipeline 16, the output end of the mixing chamber 14 is connected with the nozzle assembly 19 through a fifth pipeline 21, two-phase fluid of uniformly mixed abrasive and high-pressure water is sprayed out through the nozzle assembly 19 for abrasive water jet operation, i.e. cutting, rust removal and other operations; the sedimentation tank 13 can recycle the discharged abrasive in the abrasive tank 11;

[0042] In the embodiment, the abrasive tank 11 is a spherical high-pressure abrasive tank 11, the valve seat 20 is installed on the upper part of the spherical high-pressure abrasive tank 11, the upper part of the abrasive tank 11 is sealingly connected with the valve seat 20 through threads and keeps communication.

[0043] A quality monitor is horizontally grounded at the bottom of the abrasive tank 11 and the abrasive particle supply mechanism for detecting the quality change of the abrasive tank 11 and the abrasive particle supply mechanism during the abrasive water jet operation; specifically, the quality monitor 12 is horizontally grounded and installed below the feeding hopper 7 and the spherical high-pressure abrasive tank 11.

[0044] A data processing center 29 is electrically connected with the liquid supply mechanism, the abrasive particle supply mechanism and the quality monitor for receiving the quality difference signal of the quality monitor and performing corresponding control on the liquid supply mechanism and the abrasive particle supply mechanism so that the abrasive concentration in the abrasive tank 11 is automatically adjusted.

[0045] In the embodiment, the liquid supply mechanism comprises a water reservoir 23, a plunger pump 1, and an electronic flowmeter 2, the input end of the plunger pump 1 is connected with the water reservoir 23 through a pipeline, the plunger pump 1 and the electronic flowmeter 2 are connected on a main pipeline 15, in the embodiment, the main pipeline 15 between the plunger pump 1 and the electronic flowmeter 2 is connected with one end of a second safety valve 22, the other end of the second safety valve 22 is arranged above the water reservoir 23, and the second safety valve 22 is electrically connected with the data processing center 29. That is, the output end of the plunger pump 1 is communicated with the water reservoir 23 through the second safety valve 22.

[0046] The main pipeline 15 is divided into a first pipeline 17 and a second pipeline 16 through a tee joint, one end of the first pipeline 17 away from the main pipeline 15 is connected with the valve seat 20, a second electrically-controlled pneumatic high-pressure valve, an abrasive particle supply mechanism, and a fourth electrically-controlled pneumatic high-pressure ball valve 9 are sequentially arranged on the first pipeline 17 in the water flow direction, and are used for supplying abrasive and pure water into the spherical high-pressure abrasive tank 11; the first electrically-controlled pneumatic high-pressure ball valve 3 is arranged in series on the second pipeline 16, one end of the second pipeline 16 away from the main pipeline 15 is divided into a first branch pipeline 33 and a second branch pipeline 34 through a tee joint, the first branch pipeline 33 is connected with the valve seat 20 through the servo proportional throttle valve 8, the pressure in the abrasive tank 11 and the output speed of the abrasive can be balanced through the servo proportional throttle valve 8, the second branch pipeline 34 is connected with the mixing cavity 14 through the seventh electrically-controlled pneumatic high-pressure ball valve 32, and is used for inputting high-pressure water into the mixing cavity 14, and the data processing center 29 is electrically connected with the servo proportional throttle valve 8, the plunger pump 1, the electronic flowmeter 2, the first electrically-controlled pneumatic high-pressure ball valve 3, the second electrically-controlled pneumatic high-pressure valve, the fourth electrically-controlled pneumatic high-pressure ball valve 9, and the seventh electrically-controlled pneumatic high-pressure ball valve 32.

[0047] Specifically, the electronic flowmeter 2 is connected with the data processing center 29 through a first data transmission line 30, the mass monitor 12 is connected with the data processing center 29 through a second data transmission line 31, and is used for transmitting the abrasive mass data and the flow data of the system input water to the data processing center 29, and calculating the abrasive mass concentration, the servo proportional throttle valve 8 transmits the current valve opening degree information to the data processing center 29 and records through a third data transmission line 35, the data processing center 29 calculates the valve opening degree information according to the calculated abrasive mass concentration and the current modulus mass concentration, and transmits the calculated valve opening degree information to the servo proportional throttle valve 8 through the third data transmission line 35, so as to realize the automatic regulation and control of the abrasive mass concentration.

[0048] In the embodiment, the abrasive particle supply mechanism comprises a feed hopper 7, an output end of the feed hopper 7 is communicated with the first pipeline 17 through a third electrically controlled pneumatic high-pressure ball valve 6 and a jet pump 5 in sequence, forming an automatic abrasive supply system, and the third electrically controlled pneumatic high-pressure ball valve 6 and the jet pump 5 are electrically connected with the data processing center 29.

[0049] In the embodiment, the fourth pipeline 25 is provided with a fifth electrically controlled pneumatic high-pressure ball valve 24, and the fifth electrically controlled pneumatic high-pressure ball valve 24 is electrically connected with the data processing center 29.

[0050] In the embodiment, the third pipeline is bifurcated into a third branch pipeline 18 and a fourth branch pipeline 28 from one end extending out of the valve seat 20, the third branch pipeline 18 is provided above the sedimentation tank 13 at an end away from the valve seat 20, the fourth branch pipeline 28 is provided in the sedimentation tank 13 at an end away from the valve seat 20, a first safety valve 10 for pressure relief is provided on the third branch pipeline 18 in series, a sixth electrically controlled pneumatic high-pressure ball valve 26 is provided on the fourth branch pipeline 28, and the first safety valve 10 and the sixth electrically controlled pneumatic high-pressure ball valve 26 are electrically connected with the data processing center 29.

[0051] By arranging the first safety valve 10, when the pressure inside the abrasive tank 11 exceeds the limit, the first safety valve 10 is passively opened to release the pressure inside the abrasive tank 11.

[0052] The application further discloses a method for adjusting the abrasive concentration by using the abrasive concentration automatic adjusting system.

[0053] S1, performing abrasive water jet operation, the data processing center 29 automatically calculates the current abrasive mass concentration C0 during the abrasive water jet operation, compares the current abrasive mass concentration C0 with the abrasive mass concentration C1 input by the user, then calculates the current error a1, and if the current error a1 is greater than the error threshold a, the data processing center 29 adjusts the servo proportional throttle valve 8 to control the abrasive mass concentration until the current error a1 is less than the error threshold a.

[0054] In the embodiment, the specific steps of S1 are as follows.

[0055] S1.1, performing water filling operation on the abrasive concentration automatic adjusting system, and recording the first mass parameter m0 by the mass monitor after the abrasive concentration automatic adjusting system is filled with water.

[0056] Specifically, the first step, before the abrasive water jet operation, the system is filled with water: close the third electric control pneumatic high pressure ball valve 6, the fifth electric control pneumatic high pressure ball valve 24 and the seventh electric control pneumatic high pressure ball valve 32, open the first electric control pneumatic high pressure ball valve 3, the second electric control pneumatic high pressure ball valve 4, the fourth electric control pneumatic high pressure ball valve 9 and the sixth electric control pneumatic high pressure ball valve 26 and the servo proportional throttle valve 8. Through the plunger pump 1 to pump water, high pressure water from the high pressure water inlet 27 into the main pipeline 15, through the electronic flowmeter 2 and the main pipeline 15, respectively along the first electric control pneumatic high pressure ball valve 3, the second electric control pneumatic high pressure ball valve 4 into two pipelines (the first pipeline 17 and the second pipeline 16): the water in the first pipeline 17 passes through the second electric control pneumatic high pressure ball valve 4, the jet pump 5 and the fourth electric control pneumatic high pressure ball valve 9 into the abrasive tank 11; the water in the second pipeline 16 passes through the first electric control pneumatic high pressure ball valve 3, the first branch pipeline 33 and the servo proportional throttle valve 8 into the abrasive tank 11. When the abrasive tank 11 is filled with water and discharged through the sixth electric control pneumatic high pressure ball valve 26, the plunger pump 1 is closed, at this time, the abrasive water jet pipeline (the main pipeline 15, the first pipeline 17, the second pipeline 16 and its first branch pipeline 33, the fourth branch pipeline 28) and the abrasive tank 11 are filled with water, the precision quality monitor outputs the first quality parameter m0, and the data processing center 29 records the first quality parameter m0 through the second data transmission line 31.

[0057] S1.2, the abrasive particles are added to the feeding hopper 7, at this time, the quality monitor records the second quality parameter m1, and the data processing center 29 calculates the mass of the abrasive particles in the feeding hopper 7 m2=m1-m0;

[0058] Specifically, the second step, the abrasive particles are added to the feeding hopper 7, at this time, the precision quality monitor outputs the second quality parameter m1, and the data processing center 29 records the second quality parameter m1 through the second data transmission line 31, at this time, the data processing center 29 calculates the mass of the abrasive particles in the feeding hopper 7 m2=(m1-m0).

[0059] S1.3, the abrasive automatic feeding operation is carried out, and after the abrasive tank 11 is filled with abrasive particles, the third quality parameter m3 is recorded by the quality monitor, and the mass of the abrasive particles in the abrasive tank 11 m4=m3-m2 is calculated. m ;

[0060] Specifically, in the third step, the automatic abrasive supply operation is performed, the first electrically controlled pneumatic high-pressure ball valve 3, the fifth electrically controlled pneumatic high-pressure ball valve 24, and the servo proportional throttle valve 8 are closed, the second electrically controlled pneumatic high-pressure ball valve 4, the third electrically controlled pneumatic high-pressure ball valve 6, the fourth electrically controlled pneumatic high-pressure ball valve 9, and the sixth electrically controlled pneumatic high-pressure ball valve 26 are opened, and the plunger pump 1 is opened at the same time. High-pressure water enters from the high-pressure water inlet 27, passes through the second electrically controlled pneumatic high-pressure ball valve 4, and entrains abrasive particles at the jet pump 5 along the main pipeline 15. The high-pressure water mixed with the abrasive particles enters the abrasive tank 11 through the first pipeline 17, and the abrasive particles form a uniform fluidized abrasive in the abrasive tank 11. When the abrasive tank 11 is filled with abrasive particles, the excess abrasive particles and water mixture flows into the sedimentation tank 13 through the fourth branch pipeline 28. At this time, the plunger pump 1 and the third electrically controlled pneumatic high-pressure ball valve 6 are closed in turn. The precision mass monitor outputs the third mass parameter m3, which is recorded by the data processing center 29 through the second data transmission line 31. At this time, the data processing center 29 calculates and displays the volume V of the abrasive in the abrasive tank 11 according to the formula (m1-m3) / p1 (where p1 is the density of water), and calculates and displays the mass m of the abrasive particles in the abrasive tank 11 according to the formula (m1-m3)xp2 / p1 (where p2 is the density of the abrasive particles, which can be determined according to the tenth item in SYT 5108-2014 “Supporting Agent Performance Test Method for Hydraulic Fracturing and Gravel Packing Operation”). m , m m =(m1-m3)xp2 / p1.

[0061] S1.4, the abrasive water jet operation is performed, the abrasive water is sprayed from the nozzle assembly 19 through the fifth pipeline 21, and the average mass concentration Co of the abrasive particles in the abrasive water jet is calculated by the mass difference detected by the mass monitor and the flow difference recorded by the electronic flowmeter 2. After the abrasive water jet operation is completed, the sixth mass parameter m6 is obtained by the mass monitor, and the total mass M of the abrasive used in the abrasive water jet operation is calculated by the data processing center 29.

[0062] Specifically, the fourth step, abrasive water jet operation: the second electrically controlled pneumatic high pressure ball valve 4, the fourth electrically controlled pneumatic high pressure ball valve 9 and the sixth electrically controlled pneumatic high pressure ball valve 26 are closed, the first electrically controlled pneumatic high pressure ball valve 3, the fifth electrically controlled pneumatic high pressure ball valve 24, the seventh electrically controlled pneumatic high pressure ball valve 32 and the servo proportional throttle valve 8 are opened. Open the high pressure plunger pump 1, the high pressure water enters from the high pressure water inlet 27, passes through the plunger pump 1, the electronic flowmeter 2 and the first electrically controlled pneumatic high pressure ball valve 3 in turn, and is divided into two branches along the second pipeline 16. Part of the high pressure water is transported along the first branch pipeline 33, enters the abrasive tank 11 through the servo proportional throttle valve 8, and makes the fluidized abrasive enter the mixing chamber 14 through the fifth electrically controlled pneumatic high pressure ball valve 24 along the fourth pipeline 25. The other part of the high pressure water enters the mixing chamber 14 along the second branch pipeline 34 through the seventh electrically controlled pneumatic high pressure ball valve 32. The mixing chamber 14 is used for mixing the abrasive flowing out of the abrasive tank 11, and is sprayed from the nozzle assembly 19 through the fifth pipeline for cutting, rust removal and other operations. During the operation, the precision mass monitor and the electronic flowmeter 2 output the fourth mass parameter m4 along the second data transmission line 31 and the first flow parameter Q1 along the first data transmission line 30 at t1, and output the fifth mass parameter m5 and the second flow parameter Q2 at t2 respectively during any time period Δt=t2-t1 (t1 is the starting time of the time period, and t2 is the end time of the time period). Then the data processing center 29 calculates and displays the average mass concentration C0 of the abrasive particles in the abrasive water jet during the time period Δt according to the formula

[0063]

[0064]

[0065] After the abrasive water jet operation is completed, the precision mass monitor outputs the sixth mass parameter m6. At this time, the data processing center 29 calculates and displays the total mass M of the abrasive particles used in the abrasive water jet operation according to the formula (m3-m6).

[0066] S1.5, according to the user input mass concentration C1 of the abrasive particles, the average mass concentration C0 of the abrasive particles in a certain period of time during the abrasive water jet operation, and the current opening degree x0 of the servo proportional throttle valve 8, the opening degree x1 of the servo proportional throttle valve 8 corresponding to the user input abrasive mass concentration C1 is calculated, adjust the servo proportional throttle valve to the opening degree x1 to regulate the abrasive concentration;

[0067] Specifically, the fifth step, automatic regulation of abrasive mass concentration: first, make the servo proportional throttle valve 8 fully open, and set the abrasive mass concentration at this time to C max , C max is the upper limit of the abrasive mass concentration, and the user operation interface of the data processing center 29 allows the user to set the upper limit of the abrasive mass concentration C​max and 0 between the corresponding abrasive particles concentration, and input the acceptable mass concentration error a.

[0068] The data processing center 29 compares the concentration C0 with the user input abrasive mass concentration C1, combined with the current opening degree x0 (0≤x0≤1) of the servo proportional throttle valve 8, according to the formula

[0069]

[0070] The user input abrasive particle mass concentration C1 corresponding to the servo proportional throttle valve 8 opening degree x1 is calculated, and the opening degree information is transmitted to the servo proportional throttle valve 8 through the third data transmission line 35, and the servo proportional throttle valve 8 is automatically adjusted to the opening degree x1, so as to realize the automatic regulation of the mass concentration of abrasive particles.

[0071] S1.6, detect the regulated abrasive mass concentration C2, calculate the current error a1, and compare it with the error threshold a, if the current error a1 is less than the error threshold a, end the calibration, otherwise, assign the abrasive mass concentration C2 to the average mass concentration C0, and return to S1.5. C2 and C0 are calculated by the data center through mass difference and flow difference, but the time period corresponding to C0 is different.

[0072] Specifically, the sixth step, automatic calibration of abrasive mass concentration: the data processing center 29 automatically calculates the regulated abrasive particle mass concentration C2, and compares it with the user input abrasive particle mass concentration C1, through the formula

[0073]

[0074] Calculate the current error a1, if the current error a1 is less than the error threshold a, end the calibration; if the current error a1 is greater than the error threshold a, assign the regulated abrasive particle mass concentration C2 to C0, and then repeat the action of the fifth step until the current error a1 is less than or equal to the error threshold a, then end the calibration and maintain the opening degree of the servo proportional throttle valve 8 unchanged until the end of the current operation.

[0075] Through the adjusting system of the application, the user can directly input the required concentration, and the system will automatically monitor the current concentration and compare it with the target concentration, and make real-time correction.

[0076] Because the volume of the abrasive tank is fixed, but the density of abrasive and water is different, the application designs a new method to measure and calculate the concentration of medium, which can reduce the investment of equipment by using the original equipment. First, use the mass monitor to monitor the mass change, and then use the density difference of the mixed medium solution to calculate the concentration of the medium.

[0077] S2, the real-time working condition parameters, abrasive related information and servo proportional throttle valve 8 opening calibration during the abrasive water jet operation are stored in the data processing center 29, so as to view and analyze the data after the abrasive water jet operation, and to directly call the subsequent abrasive water jet operation.

[0078] S3, the abrasive concentration automatic adjustment system is cleaned for next use.

[0079] Specifically, the seventh step is to clean the abrasive: close the plunger pump 1 and the third electrically controlled pneumatic high pressure ball valve 6, open the first electrically controlled pneumatic high pressure ball valve 3, the second electrically controlled pneumatic high pressure ball valve 4, the fourth electrically controlled pneumatic high pressure ball valve 9, the fifth electrically controlled pneumatic high pressure ball valve 24, the sixth electrically controlled pneumatic high pressure ball valve 26, the seventh electrically controlled pneumatic high pressure ball valve 32 and the servo proportional throttle valve 8. Adjust the plunger pump 1 to low pressure output, and the low pressure water enters from the high pressure water inlet 27, passes through the plunger pump 1 and the electronic flowmeter 2 in turn, and is divided into two ways through the main pipeline 15: the low pressure water of the first pipeline 17 passes through the second electrically controlled pneumatic high pressure ball valve 4, the jet pump 5 and the fourth electrically controlled pneumatic high pressure ball valve 9 into the abrasive tank 11; the second pipeline 16 is divided into two branch pipelines through the first electrically controlled pneumatic high pressure ball valve 3, the low pressure water of the first branch pipeline 33 passes through the servo proportional throttle valve 8 into the abrasive tank 11, and the water in the abrasive tank 11 passes through the fourth pipeline 25, the fifth electrically controlled pneumatic high pressure ball valve 24 and the mixing chamber 14 into the fifth pipeline 21, and finally is discharged from the nozzle assembly 19, the low pressure water of the second branch pipeline 34 passes through the seventh electrically controlled pneumatic high pressure ball valve 32 and the mixing chamber 14 into the fifth pipeline 21, and finally is discharged from the nozzle assembly 19. When the mass parameter output by the precision mass monitor is stable and unchanged for 1 minute, it indicates that the abrasive cleaning is completed, the plunger pump 1 can be closed, and finally the water is emptied for next use.

[0080] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for automatically adjusting abrasive concentration, characterized in that, The abrasive concentration is adjusted using an automatic abrasive concentration adjustment system, including: S1. During the abrasive waterjet operation, the data processing center automatically calculates the current abrasive mass concentration. and compared with the abrasive mass concentration input by the user. Compare the results and then calculate the current error. If the current error Greater than the error threshold a ， The data processing center then adjusts the servo proportional throttle valve to control the abrasive mass concentration until the current error... Less than the error threshold a; The specific steps of S1 are as follows: S1.

1. Fill the abrasive concentration automatic adjustment system with water, and record the first mass parameter using a mass monitoring instrument after the system is filled with water. ; S1.

2. Add the abrasive particles into the feed hopper. At this time, the quality monitoring instrument records the second quality parameter. The mass of abrasive particles in the feed hopper is calculated by the data processing center. ; S1.

3. Perform automatic abrasive feeding operation. After the abrasive jar is filled with abrasive particles, record the third quality parameter through a quality monitoring instrument. And calculate the mass of the abrasive particles located in the abrasive jar. ; The mass of the abrasive inside the abrasive jar The calculation formula is: ； in, The density of water, The density of the abrasive particles; S1.

4. Conduct abrasive water jet operation. Abrasive water is ejected from the nozzle assembly through the fifth pipeline. The average mass concentration of abrasive particles in the abrasive water jet at a certain time period is calculated by recording the mass difference detected by the quality monitoring instrument and the flow difference recorded by the electronic flow meter. After the abrasive waterjet operation is completed, the sixth quality parameter is obtained through a quality monitoring instrument. The total mass M of abrasive particles used in abrasive waterjet operations is calculated through the data processing center. S1.5, Based on the abrasive mass concentration input by the user. The average mass concentration of abrasive particles at a certain time during abrasive waterjet operation. and the current opening of the servo proportional throttle valve Calculate the abrasive mass concentration input by the user. The opening degree of the corresponding servo proportional throttle valve , Adjust the servo proportional throttle valve to the specified opening degree. Adjusting the abrasive concentration; Average mass concentration of abrasive particles at a certain time during abrasive waterjet operation The calculation formula is: ； in, , These are the fourth and fifth quality parameters monitored by the quality monitoring instrument at the beginning and end of a certain time period, respectively. , These are the first and second flow parameters monitored by the electronic flow meter at the beginning and end of a certain time period, respectively. , and , The corresponding time period is the same time period; S1.6 Detect the adjusted abrasive mass concentration According to the formula Calculate the current error And compare it with the error threshold a, if the current error If the abrasive mass concentration is less than the error threshold 'a', then the calibration ends; otherwise, adjust the abrasive mass concentration. Assigned to average mass concentration Then return to S1.5; S2. Real-time operating parameters, abrasive-related information, and servo proportional throttle valve opening calibration during the abrasive waterjet operation will be stored in the data processing center for viewing and analysis after the abrasive waterjet operation is completed, and can be directly called upon in subsequent abrasive waterjet operations. S3. Clean the automatic abrasive concentration adjustment system in preparation for the next use; The automatic abrasive concentration adjustment system includes: An abrasive jetting device includes an abrasive tank, a liquid supply mechanism, an abrasive particle supply mechanism, a sedimentation tank, and a nozzle assembly. A valve seat is installed on the top of the abrasive tank. The liquid supply mechanism is connected to the valve seat via a first pipeline and / or a second pipeline. The liquid supply mechanism includes a water storage tank, a plunger pump, and an electronic flow meter. The electronic flow meter is connected to a main pipeline. The main pipeline is divided into a first pipeline and a second pipeline. The second pipeline, at its end away from the main pipeline, is further divided into a first branch pipeline and a second branch pipeline. The first branch pipeline is connected to the valve seat via a servo proportional throttle valve. The abrasive particle supply mechanism is located on the first pipeline. The sedimentation tank is connected to the valve seat via a third pipeline. The bottom of the abrasive tank is connected to one input end of a mixing chamber via a fourth pipeline. The other input end of the mixing chamber is connected to the second pipeline. The output end of the mixing chamber is connected to the nozzle assembly via a fifth pipeline. A quality monitoring instrument is horizontally installed at the bottom of the abrasive tank and the abrasive particle supply mechanism to detect the quality changes of the abrasive tank and the abrasive particle supply mechanism during the abrasive water jet operation. The data processing center is electrically connected to the liquid supply mechanism, the abrasive particle supply mechanism, and the quality monitoring instrument. It is used to receive the quality difference signal from the quality monitoring instrument and to control the liquid supply mechanism and the abrasive particle supply mechanism accordingly so that the abrasive concentration in the abrasive tank is automatically adjusted.

2. The method for automatically adjusting abrasive concentration according to claim 1, characterized in that, The input end of the plunger pump is connected to the water storage tank via a pipeline. The plunger pump is connected to the main pipeline. The end of the first pipeline away from the main pipeline is connected to the valve seat. The first pipeline is sequentially equipped with a second electrically controlled pneumatic high-pressure valve, an abrasive particle supply mechanism, and a fourth electrically controlled pneumatic high-pressure ball valve along the water flow direction. The second pipeline is equipped with a first electrically controlled pneumatic high-pressure ball valve connected in series. The second branch pipeline is connected to the mixing chamber via a seventh electrically controlled pneumatic high-pressure ball valve. The data processing center is electrically connected to the servo proportional throttle valve, the plunger pump, the electronic flow meter, the first electrically controlled pneumatic high-pressure ball valve, the second electrically controlled pneumatic high-pressure valve, the fourth electrically controlled pneumatic high-pressure ball valve, and the seventh electrically controlled pneumatic high-pressure ball valve.

3. The method for automatically adjusting abrasive concentration according to claim 1 or 2, characterized in that, The abrasive particle supply mechanism includes a feeding hopper. The output end of the feeding hopper is connected to the first pipeline in sequence through a third electrically controlled pneumatic high-pressure ball valve and a jet pump. The third electrically controlled pneumatic high-pressure ball valve and the jet pump are electrically connected to the data processing center.

4. The method for automatically adjusting abrasive concentration according to claim 1, characterized in that, The fourth pipeline is equipped with a fifth electrically controlled pneumatic high-pressure ball valve, which is electrically connected to the data processing center.

5. The method for automatically adjusting abrasive concentration according to claim 1, characterized in that, The third pipeline extends from the valve seat and splits into a third branch pipeline and a fourth branch pipeline. The end of the third branch pipeline away from the valve seat is located above the sedimentation tank, and the end of the fourth branch pipeline away from the valve seat is located inside the sedimentation tank. A first safety valve for pressure relief is connected in series on the third branch pipeline, and a sixth electro-pneumatic high-pressure ball valve is provided on the fourth branch pipeline. The first safety valve and the sixth electro-pneumatic high-pressure ball valve are electrically connected to the data processing center.

6. The method for automatically adjusting abrasive concentration according to claim 2, characterized in that, The main pipeline between the plunger pump and the electronic flow meter is connected to one end of the second safety valve, the other end of which is located above the water storage tank. The second safety valve is electrically connected to the data processing center.

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