A method for regulating the quality of machine-made sand

Abstract

The present disclosure proposes a method for adjusting the quality of machine-made sand, including: obtaining machine-made sand, and dividing the machine-made sand into a first machine-made sand and a second machine-made sand with different particle sizes; mixing the first machine-made sand and the second machine-made sand into fine sand; adjusting the flow rate of the first machine-made sand and the flow rate of the second machine-made sand according to the fineness modulus of the fine sand, so that the fineness modulus of the fine sand tends to a set value; if the fineness modulus of the fine sand cannot reach the set value, adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand until the fineness modulus of the fine sand reaches the set value. In a method for adjusting the quality of machine-made sand disclosed in the present disclosure, the fineness modulus of the fine sand is ensured to reach the set value by adjusting the flow rate and the particle size, thereby realizing online automatic adjustment of the quality of fine sand preparation, thereby saving a long time consumed by test determination, effectively taking into account the preparation quality and preparation efficiency of fine sand, and reducing the preparation cost of fine sand.

Description

Technical Field

[0001] The present disclosure relates to the technical field of machine-made sand, and in particular to a method for regulating the quality of machine-made sand. Background Art

[0002] Artificial sand refers to sand processed by sand making machines and other ancillary equipment. The finished product is more regular and can be processed into sand of different rules and sizes according to different process requirements to meet daily needs.

[0003] At present, in the preparation process of machine-made sand, it is necessary to test and measure the machine-made sand to adjust the preparation parameters according to the results of the test and measurement, so as to ensure the preparation quality of the machine-made sand. However, the test and measurement require sampling, finished product drying, screening, weighing and other processes. The test time is relatively long, and it is difficult to take into account both the preparation quality and preparation efficiency of the machine-made sand. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, an object of the present disclosure is to provide a method for regulating the quality of machine-made sand.

[0006] To achieve the above-mentioned purpose, the present disclosure provides a method for regulating the quality of machine-made sand, comprising: obtaining machine-made sand, and dividing the machine-made sand into a first machine-made sand and a second machine-made sand with different particle sizes; mixing the first machine-made sand and the second machine-made sand into fine sand; adjusting the flow rate of the first machine-made sand and the flow rate of the second machine-made sand according to the fineness modulus of the fine sand, so that the fineness modulus of the fine sand tends to a set value; if the fineness modulus of the fine sand cannot reach the set value, adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand until the fineness modulus of the fine sand reaches to the set value; wherein, the obtaining of machine-made sand and dividing the machine-made sand into a first machine-made sand and a second machine-made sand with different particle sizes comprises: obtaining stone; crushing the stone by a crusher; grading the crushed stone by a powder classifier to obtain the machine-made sand at the coarse powder discharge end of the powder classifier; sieving the machine-made sand by a screening machine to obtain the first machine-made sand and the second machine-made sand; the adjusting of the particle size of the machine-made sand according to the fineness modulus of the fine sand comprises: setting the crusher as the first adjustment object and setting the powder classifier as the second adjustment object object; setting the initial speed values ​​of the first adjustment object and the second adjustment object; obtaining the first deviation value between the fineness modulus of the fine sand and the set value; selecting the corresponding first adjustment coefficient and second adjustment coefficient according to the first deviation value; multiplying the first adjustment coefficient by the initial speed value of the first adjustment object to obtain the actual speed value of the first adjustment object, and multiplying the second adjustment coefficient by the initial speed value of the second adjustment object to obtain the first actual speed value of the second adjustment object; controlling the crusher to crush according to the actual speed value of the first adjustment object, and controlling the powder classifier to classify according to the first actual speed value of the second adjustment object; obtaining the machine-made sand and dividing the machine-made sand into the first machine-made sand and the second machine-made sand with different particle sizes also includes: removing dust from the feed end of the powder classifier and the feed end of the screening machine through a dust collector; adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand also includes: setting the powder classifier and the dust collector together as the second adjustment object; controlling the powder classifier to classify and the dust collector to remove dust according to the first actual speed value of the second adjustment object.

[0007] Optionally, mixing the first machine-made sand and the second machine-made sand into fine sand includes: transporting the first machine-made sand to a mixing point at a first flow rate; transporting the second machine-made sand to the mixing point at a second flow rate, so that the first machine-made sand and the second machine-made sand are mixed into the fine sand at the mixing point; adjusting the flow rate of the first machine-made sand and the flow rate of the second machine-made sand according to the fineness modulus of the fine sand includes: obtaining a flow ratio between the first flow rate and the second flow rate; and adjusting the flow ratio so that the fineness modulus of the fine sand approaches a set value.

[0008] Optionally, mixing the first machine-made sand and the second machine-made sand into fine sand includes: transporting the first machine-made sand to a mixing point through a first quantitative belt conveyor at the first flow rate; transporting the second machine-made sand to a mixing point through a second quantitative belt conveyor at the second flow rate; adjusting the flow ratio includes: adjusting the rotation speed of the first quantitative belt conveyor, and / or adjusting the rotation speed of the second quantitative belt conveyor.

[0009] Optionally, adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand also includes: setting a powder content threshold of the fine sand; obtaining the powder content of the fine sand; obtaining a second deviation value between the powder content of the fine sand and the powder content threshold; selecting a corresponding third adjustment coefficient according to the second deviation value; multiplying the third adjustment coefficient by the initial speed value of the second adjustment object to obtain a second actual speed value of the second adjustment object; and controlling the dust collector to remove dust according to the second actual speed value of the second adjustment object.

[0010] Optionally, screening the machine-made sand through a screening machine to obtain the first machine-made sand and the second machine-made sand includes: screening the machine-made sand through a first sieve and a second sieve in sequence, wherein the mesh diameter of the first sieve is larger than the mesh diameter of the second sieve; collecting the machine-made sand that has passed through the second sieve to obtain the first machine-made sand; and separating the machine-made sand that has not passed through the second sieve through a separating hopper to obtain the second machine-made sand at a first discharge end of the separating hopper.

[0011] Optionally, crushing the stone by means of a crusher includes: crushing the stone by means of a first crusher; crushing the machine-made sand at the second discharge end of the distribution hopper by means of a second crusher, wherein the rotation speed of the second crusher is greater than the rotation speed of the first crusher; mixing the stone crushed by the first crusher with the machine-made sand crushed by the second crusher; adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand also includes: setting the first crusher and the second crusher together as a first adjustment object; and controlling the first crusher to perform crushing and the second crusher to perform crushing according to the actual value of the rotation speed of the first adjustment object.

[0012] The technical solution provided by the present disclosure may have the following beneficial effects:

[0013] By adjusting the flow rate and particle size, the fineness modulus of fine sand can be guaranteed to reach the set value, thereby realizing online automatic adjustment of the quality of fine sand preparation, thereby eliminating the long time consumed in test and measurement, effectively taking into account the preparation quality and efficiency of fine sand, and reducing the preparation cost of fine sand.

[0014] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0016] Figure 1 It is a schematic flow chart of a method for adjusting the quality of machine-made sand proposed in an embodiment of the present disclosure;

[0017] Figure 2 It is a structural schematic diagram of a method for adjusting the quality of machine-made sand proposed in an embodiment of the present disclosure;

[0018] As shown in the figure: 1. Silo, 2. Vibrating feeder, 3. First crusher, 4. Second crusher, 5. Powder selector, 6. Screening machine, 7. First quantitative belt conveyor, 8. Second quantitative belt conveyor, 9. Machine-made sand production quality information monitoring system, 10. Distribution hopper, 11. Dust collector. DETAILED DESCRIPTION

[0019] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0020] like Figure 1 As shown, the embodiment of the present disclosure provides a method for adjusting the quality of machine-made sand, comprising:

[0021] Obtaining machine-made sand, and dividing the machine-made sand into first machine-made sand and second machine-made sand having different particle sizes;

[0022] Mixing the first machine-made sand with the second machine-made sand to form fine sand;

[0023] According to the fineness modulus of the fine sand, the flow rate of the first machine-made sand and the flow rate of the second machine-made sand are adjusted so that the fineness modulus of the fine sand approaches the set value;

[0024] If the fineness modulus of the fine sand cannot reach the set value, the particle size of the machine-made sand is adjusted according to the fineness modulus of the fine sand until the fineness modulus of the fine sand reaches the set value.

[0025] It can be understood that the fineness modulus of the fine sand is adjusted by regulating the flow rate of the first machine-made sand and the flow rate of the second machine-made sand, thereby achieving the adjustment of the fineness modulus of the fine sand so that the fineness modulus of the fine sand reaches the set value, and when the fineness modulus of the fine sand is difficult to reach the set value by adjusting the flow rate, the particle size of the machine-made sand is adjusted by the fineness modulus of the fine sand so that the fineness modulus of the fine sand reaches the set value.

[0026] Therefore, by adjusting the flow rate and particle size, the fineness modulus of fine sand can be guaranteed to reach the set value, thereby realizing online automatic adjustment of the quality of fine sand preparation, thereby eliminating the long time consumed in test and measurement, effectively taking into account the preparation quality and efficiency of fine sand, and reducing the preparation cost of fine sand.

[0027] It should be noted that the fineness modulus of fine sand is an important technical indicator that determines the quality of fine sand preparation. The calculation formula for the fineness modulus of fine sand is as follows:

[0028]

[0029] Among them, M Xis the fineness modulus of fine sand, A1 is the cumulative residual percentage of the first sieve for fine sand, A2 is the cumulative residual percentage of the second sieve for fine sand, A3 is the cumulative residual percentage of the third sieve for fine sand, A4 is the cumulative residual percentage of the fourth sieve for fine sand, A5 is the cumulative residual percentage of the fifth sieve for fine sand, A6 is the cumulative residual percentage of the sixth sieve for fine sand, the fine sand is sieved by the first sieve, the second sieve, the third sieve, the fourth sieve, the fifth sieve and the sixth sieve in sequence, and the sieve hole diameters of the first sieve, the second sieve, the third sieve, the fourth sieve, the fifth sieve and the sixth sieve decrease in sequence.

[0030] For example, the mesh diameter of the first sieve may be 4.75 mm, the mesh diameter of the second sieve may be 2.36 mm, the mesh diameter of the third sieve may be 1.18 mm, the mesh diameter of the fourth sieve may be 0.60 mm, the mesh diameter of the fifth sieve may be 0.30 mm, and the mesh diameter of the sixth sieve may be 0.15 mm.

[0031] The cumulative residue percentage is calculated by the residue amount, and the calculation formula of the residue amount is as follows:

[0032]

[0033] Among them, m a is the screen residue, that is, the weight of the fine sand remaining on the screen, A is the screen area of ​​the screen, and d is the screen hole diameter of the screen.

[0034] The specific particle sizes of the first machine-made sand and the second machine-made sand can be set according to actual needs, without limitation. For example, the particle size of the first machine-made sand is smaller than that of the second machine-made sand. The particle size of the first machine-made sand can be less than 3 mm, and the particle size of the second machine-made sand can be greater than or equal to 3 mm and less than 5 mm.

[0035] In some embodiments, mixing the first machine-made sand with the second machine-made sand to form fine sand comprises:

[0036] transporting the first machine-made sand to a mixing point at a first flow rate;

[0037] The second machine-made sand is transported to the mixing point at a second flow rate, so that the first machine-made sand and the second machine-made sand are mixed into fine sand at the mixing point.

[0038] Adjusting the flow rate of the first machine-made sand and the flow rate of the second machine-made sand according to the fineness modulus of the fine sand includes:

[0039] obtaining a flow ratio between the first flow and the second flow;

[0040] Adjust the flow ratio so that the fineness modulus of the fine sand approaches the set value.

[0041] It can be understood that by adjusting the flow ratio between the first flow rate and the second flow rate, the fineness modulus of the fine sand can be adjusted, so that the fineness modulus of the fine sand can approach the set value, thereby taking into account the preparation quality and preparation efficiency of the fine sand, and reducing the preparation cost of the fine sand.

[0042] Among them, the fineness modulus of fine sand is adjusted by adjusting the flow ratio, which makes the adjustment simpler and more accurate, and effectively improves the adjustment efficiency and adjustment quality of the fineness modulus of fine sand.

[0043] It should be noted that the flow ratio can be the first flow as the denominator and the second flow as the numerator, or the first flow as the numerator and the second flow as the denominator, and there is no limitation to this.

[0044] For example, the flow ratio is calculated as follows:

[0045]

[0046] Wherein, P is the flow ratio, P1 is the first flow, and P2 is the second flow.

[0047] The flow ratio is defined so that the calculation formula of the flow ratio can also be as follows:

[0048]

[0049] From this we can see that the fineness modulus of fine sand can be directly adjusted by adjusting the flow ratio.

[0050] The initial values ​​of the first flow rate and the second flow rate can be set according to actual needs and are not limited thereto.

[0051] like Figure 2 As shown, in some embodiments, mixing the first machine-made sand with the second machine-made sand into fine sand includes:

[0052] The first machine-made sand is transported to the mixing point through the first quantitative belt conveyor 7 at a first flow rate;

[0053] The second machine-made sand is transported to the mixing point through the second quantitative belt conveyor 8 at a second flow rate.

[0054] Adjusting the flow ratio includes:

[0055] The rotation speed of the first quantitative belt conveyor 7 and / or the rotation speed of the second quantitative belt conveyor 8 are adjusted.

[0056] It can be understood that, through the setting of the first quantitative belt conveyor 7 and the second quantitative belt conveyor 8, not only the transportation of the first machine-made sand and the second machine-made sand is realized to ensure the stable preparation of fine sand, but also due to the quantitative transportation of the first quantitative belt conveyor 7 and the second quantitative belt conveyor 8, the adjustment of the first flow rate and the second flow rate is more convenient and accurate, thereby ensuring the preparation quality and efficiency of fine sand.

[0057] It should be noted that the specific types of the first quantitative belt conveyor 7 and the second quantitative belt conveyor 8 can be set according to actual needs and are not limited to this. For example, the first quantitative belt conveyor 7 has the same structure as the second quantitative belt conveyor 8. The first quantitative belt conveyor 7 may include a pressure sensor and a variable frequency motor, wherein the variable frequency motor is used to drive the belt of the first quantitative belt conveyor 7 to rotate, and the pressure sensor is used to detect the pressure on the belt in the first quantitative belt conveyor 7. Therefore, the first flow rate can be adjusted by adjusting the speed of the variable frequency motor, and the first flow rate of the first machine-made sand can be calculated by the speed of the variable frequency motor and the pressure output by the pressure sensor.

[0058] The flow ratio can be adjusted by adjusting only the rotation speed of the first quantitative belt conveyor 7, or only the rotation speed of the second quantitative belt conveyor 8, or the rotation speed of the first quantitative belt conveyor 7 and the rotation speed of the second quantitative belt conveyor 8 can be adjusted simultaneously, and there is no limitation to this.

[0059] The specific type of the mixing point can be set according to actual needs and is not limited to this. For example, the mixing point can be a belt conveyor, that is, the first machine-made sand is transported to the fine sand belt conveyor through the first quantitative belt conveyor 7, and the second machine-made sand is transported to the fine sand belt conveyor through the second quantitative belt conveyor 8. The first machine-made sand and the second machine-made sand are mixed on the fine sand belt conveyor to form fine sand.

[0060] Among them, the specific type of the fine sand belt machine can be set according to actual needs, and there is no restriction on this. For example, the fine sand belt machine may include a pressure sensor and a speed sensor, wherein the pressure sensor is used to detect the pressure on the belt in the fine sand belt machine, and the speed sensor is used to detect the rotation speed of the belt in the fine sand belt machine. Therefore, the flow rate of fine sand can be calculated by the rotation speed output by the speed sensor and the pressure output by the pressure sensor, and then the preparation amount of fine sand can be calculated.

[0061] like Figure 2 As shown, in some embodiments, obtaining machine-made sand and dividing the machine-made sand into first machine-made sand and second machine-made sand having different particle sizes includes:

[0062] Obtaining stone;

[0063] The stone is crushed by a crusher;

[0064] The crushed stone is classified by the powder classifier 5 to obtain machine-made sand at the coarse powder discharge end of the powder classifier 5;

[0065] The machine-made sand is screened by a screener 6 to obtain first machine-made sand and second machine-made sand.

[0066] It can be understood that through the setting of the crusher, the stone can be formed into machine-made sand of various particle sizes. Through the setting of the powder classifier 5, the powder content of the machine-made sand is greatly reduced. Through the setting of the screening machine 6, the first machine-made sand and the second machine-made sand of different particle sizes can be screened out, thereby ensuring the high-quality preparation of fine sand.

[0067] It should be noted that the stone material is a crushed stone after primary processing, and the specific type of the stone material can be set according to actual needs, and there is no restriction on this. Among them, a silo 1 can be set to temporarily store the stone material input from the outside.

[0068] The crusher is used to crush stones. A vibrating feeder 2 can be arranged between the crusher and the silo 1 to ensure that the stones in the silo 1 can stably enter the crusher for crushing.

[0069] The powder classifier 5 is used for grading the crushed stone to separate the coarse sand containing the first machine-made sand and the second machine-made sand. The specific type of the powder classifier 5 can be set according to actual needs and is not limited to this. For example, the powder classifier 5 can be a wind powder classifier 5, which has a feed end, a fine powder discharge end and a coarse powder discharge end.

[0070] The screening machine 6 is used for screening machine-made sand. The specific type of the screening machine 6 can be set according to actual needs, and there is no limitation on this. For example, the screening machine 6 can be a vibrating screen.

[0071] In some embodiments, adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand comprises:

[0072] The crusher is set as the first adjustment object, and the powder classifier 5 is set as the second adjustment object;

[0073] Setting initial values ​​of the rotation speeds of the first adjustment object and the second adjustment object;

[0074] Obtaining a first deviation value between the fineness modulus of fine sand and a set value;

[0075] Selecting a corresponding first adjustment coefficient and a second adjustment coefficient according to the first deviation value;

[0076] The first adjustment coefficient is multiplied by the initial value of the speed of the first adjustment object to obtain the actual value of the speed of the first adjustment object, and the second adjustment coefficient is multiplied by the initial value of the speed of the second adjustment object to obtain the first actual value of the speed of the second adjustment object;

[0077] The crusher is controlled to perform crushing according to the actual value of the rotation speed of the first adjustment object, and the powder classifier 5 is controlled to perform classification according to the first actual value of the rotation speed of the second adjustment object.

[0078] It can be understood that the corresponding first adjustment coefficient and second adjustment coefficient are selected by the first deviation value between the fineness modulus of the fine sand and the set value, and the rotational speed of the crusher and the powder selector 5 are controlled according to the first adjustment coefficient and the second adjustment coefficient, so as to achieve the adjustment of the fineness modulus of the fine sand. When the fineness modulus of the fine sand is difficult to reach the set value by adjusting the flow rate, the fineness modulus of the fine sand can reach the set value by adjusting the rotational speed, thereby taking into account both the preparation quality and preparation efficiency of the fine sand and reducing the preparation cost of the fine sand.

[0079] It should be noted that, the higher the rotation speed of the first regulating object, the smaller the particle size of the machine-made sand, and the higher the rotation speed of the second regulating object, the larger the particle size of the machine-made sand.

[0080] The first deviation value is the fineness modulus of the fine sand minus the set value. The mapping relationship between the first deviation value and the first adjustment coefficient and the second adjustment coefficient can be determined through experiments, simulations, etc., and there is no limitation on this.

[0081] For example, the initial value of the speed of the first adjustment object is the same as the initial value of the speed of the second adjustment object. The speed of the first adjustment object and the speed of the second adjustment object can both be determined by the motor frequency. The initial value of the motor frequency of the crusher and the initial value of the motor frequency of the powder selector 5 can both be 35Hz.

[0082] Among them, when the first deviation value is less than -0.5, the first adjustment coefficient can be 0.6, and the second adjustment coefficient can be 1.4; when the first deviation value is greater than or equal to -0.5 and less than -0.4, the first adjustment coefficient can be 0.7, and the second adjustment coefficient can be 1.3; when the first deviation value is greater than or equal to -0.4 and less than -0.3, the first adjustment coefficient can be 0.8, and the second adjustment coefficient can be 1.2; when the first deviation value is greater than or equal to -0.3 and less than -0.2, the first adjustment coefficient can be 0.9, and the second adjustment coefficient can be 1.1; when the first deviation value is greater than or equal to -0.2 and less than or When the first deviation value is greater than 0.2 and less than or equal to 0.3, the first adjustment coefficient can be 1.1, and the second adjustment coefficient can be 0.9; when the first deviation value is greater than 0.3 and less than or equal to 0.4, the first adjustment coefficient can be 1.2, and the second adjustment coefficient can be 0.8; when the first deviation value is greater than 0.4 and less than or equal to 0.5, the first adjustment coefficient can be 1.3, and the second adjustment coefficient can be 0.7; when the first deviation value is greater than 0.5, the first adjustment coefficient can be 1.4, and the second adjustment coefficient can be 0.6.

[0083] Taking the case where the first deviation value is less than -0.5 as an example, at this time, the fineness modulus of the fine sand is too small, and the particle size of the machine-made sand needs to be increased. The actual value of the motor frequency of the crusher is 35Hz multiplied by 0.6, which is 21Hz, and the actual value of the motor frequency of the powder selector 5 is 35Hz multiplied by 1.4, which is 49Hz.

[0084] like Figure 2 As shown, in some embodiments, obtaining machine-made sand and dividing the machine-made sand into first machine-made sand and second machine-made sand having different particle sizes further includes:

[0085] The feed end of the powder selector 5 and the feed end of the screening machine 6 are dusted by the dust collector 11 .

[0086] According to the fineness modulus of fine sand, the particle size of machine-made sand is also adjusted:

[0087] The powder selector 5 and the dust collector 11 are jointly set as the second adjustment object; the powder selector 5 is controlled to perform classification and the dust collector 11 is controlled to perform dust removal according to the first actual value of the speed of the second adjustment object.

[0088] It can be understood that, through the setting of the dust collector 11, the powder content of the machine-made sand is greatly reduced, and the generation of large dust in the preparation process of fine sand is also avoided. At the same time, since the powder selector 5 and the dust collector 11 are jointly set as the second adjustment object, the particle size of the machine-made sand can be more accurately adjusted, so that the preparation quality of fine sand is higher.

[0089] It should be noted that the adjustment method of the dust collector 11 is the same as that of the powder classifier 5, and examples are not given one by one for this.

[0090] The dust collector 11 is used for dust removal. The specific type of the dust collector 11 can be set according to actual needs and is not limited to this. For example, the dust collector 11 may include a negative pressure box, a fan, a filter and a dust tank. The filter is arranged in the negative pressure box and divides the negative pressure box into a first chamber and a second chamber. The air inlet end of the fan is connected to the air outlet end of the first chamber, and the air inlet end of the second chamber extends to the feed end of the powder selector 5 and the screening machine 6 through multiple pipelines. The feed end of the dust tank is connected to the discharge end of the second chamber. Therefore, after the fan is turned on, negative pressure is generated in the first chamber and the second chamber, thereby sucking the dust at the feed end of the powder selector 5 and the screening machine 6 into the second chamber and settling it in the dust tank.

[0091] In some embodiments, adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand further comprises:

[0092] Set the powder content threshold of fine sand;

[0093] Get the powder content of fine sand;

[0094] Obtaining a second deviation value between the powder content of the fine sand and the powder content threshold;

[0095] Selecting a corresponding third adjustment coefficient according to the second deviation value;

[0096] Multiplying the third adjustment coefficient by the initial value of the speed of the second adjustment object to obtain a second actual speed value of the second adjustment object;

[0097] The dust removal machine 11 is controlled to remove dust according to the second actual speed value of the second adjustment object.

[0098] It can be understood that by obtaining the second deviation value between the powder content of the fine sand and the powder content threshold, the corresponding third adjustment coefficient is selected, and the rotation speed of the dust collector 11 is controlled according to the third adjustment coefficient, so as to effectively adjust the powder content of the fine sand and avoid excessive dust in the fine sand, thereby improving the preparation quality of the fine sand.

[0099] It should be noted that the powder content threshold can be set according to actual needs and is not limited thereto. For example, the powder content threshold may be 7%.

[0100] The second deviation value is the powder content of the fine sand minus the powder content threshold value. The mapping relationship between the second deviation value and the third adjustment coefficient can be determined through experiments, simulations, etc., and there is no limitation to this.

[0101] For example, the initial value of the rotation speed of the second adjustment object can be determined by the motor frequency, and the initial value of the motor frequency of the dust collector 11 can be 35 Hz.

[0102] Among them, when the first deviation value is less than 0, it means that the powder content of the fine sand is low and no adjustment is required. When the first deviation value is greater than 0 and less than or equal to 3%, the third adjustment coefficient can be 1.1; when the first deviation value is greater than 3% and less than or equal to 5%, the third adjustment coefficient can be 1.2; when the first deviation value is greater than 5% and less than or equal to 8%, the third adjustment coefficient can be 1.3; when the first deviation value is greater than 8%, it means that the powder content of the fine sand is too high, and it is necessary to replace the stone or optimize the primary processing procedure of the stone.

[0103] Taking the case where the first deviation value is greater than 0 and less than or equal to 3% as an example, at this time, the powder content of the fine sand is too high, and the particle size of the machine-made sand needs to be increased. The actual value of the motor frequency of the dust collector 11 is 35 Hz multiplied by 1.1, which is 38.5 Hz.

[0104] like Figure 2 As shown, the fineness modulus and powder content of fine sand can be monitored by the machine-made sand production quality information monitoring system 9, which is arranged between the first machine-made sand and the second machine-made sand and the fine sand belt conveyor, that is, the discharge ends of the first machine-made sand and the second machine-made sand are connected to the feed end of the machine-made sand production quality information monitoring system 9, and the discharge end of the machine-made sand production quality information monitoring system 9 is connected to the feed end of the fine sand belt conveyor. Among them, the specific type of the machine-made sand production quality information monitoring system 9 can be set according to actual needs, and there is no limitation to this. For example, the machine-made sand production quality information monitoring system 9 may include a sampling module, a screening module, a metering module, a morphology and particle size analysis module, a data processing and information uploading module, a residual material recovery module, etc.

[0105] In order to ensure that the machine-made sand production quality information monitoring system 9 can accurately detect parameters such as the fineness modulus and powder content of fine sand, the start threshold of the machine-made sand production quality information monitoring system 9 can be set. When the flow rate between the machine-made sand production quality information monitoring system 9 and the fine sand belt conveyor is greater than the start threshold, the machine-made sand production quality information monitoring system 9 is started for sampling and detection. The start threshold can be 50t / h.

[0106] like Figure 2 As shown, in some embodiments, screening the machine-made sand through the screening machine 6 to obtain the first machine-made sand and the second machine-made sand includes:

[0107] Screening the machine-made sand through a first sieve and a second sieve in sequence, wherein the mesh diameter of the first sieve is larger than the mesh diameter of the second sieve;

[0108] collecting the machine-made sand passing through the second screen to obtain first machine-made sand;

[0109] The machine-made sand that has not passed through the second screen is divided through the dividing hopper 10 , and the second machine-made sand is obtained at the first discharge end of the dividing hopper 10 .

[0110] It can be understood that by setting the first screen and the second screen, the machine-made sand after crushing and grading can be divided into the first machine-made sand and the second machine-made sand, thereby ensuring that the first machine-made sand and the second machine-made sand can be accurately mixed into fine sand, ensuring the high-quality preparation of fine sand.

[0111] The flow rate of the second machine-made sand is controlled by setting the sub-hopper 10, so that the flow rate of the second machine-made sand is more precisely regulated and more flexible.

[0112] It should be noted that the mesh diameter of the first sieve and the mesh diameter of the second sieve can be set according to actual needs, without limitation. For example, the mesh diameter of the first sieve can be 3 mm, and the mesh diameter of the second sieve can be 5 mm; the mesh diameter of the first sieve can be 0.15 mm, and the mesh diameter of the second sieve can be 10 mm.

[0113] Among them, the first screen and the second screen are screening components in the screening machine 6. A third screen, a fourth screen, etc. can also be set in the screening machine 6. At the same time, a dividing hopper 10 that cooperates with the third screen, the fourth screen, etc. can also be set, and there is no restriction on this.

[0114] The specific type of the distribution hopper 10 can be set according to actual needs and is not limited to this. For example, the distribution hopper 10 includes a feed end, a first discharge end, a second discharge end and a partition. The partition is used to adjust the passage between the feed end of the distribution hopper 10 and the first discharge end and the second discharge end. The second machine-made sand flow rate is controlled by rotating the partition.

[0115] like Figure 2 As shown, in some embodiments, crushing the stone by a crusher includes:

[0116] The stone is crushed by the first crusher 3; the machine-made sand at the second discharge end of the distribution hopper 10 is crushed by the second crusher 4, wherein the rotation speed of the second crusher 4 is greater than the rotation speed of the first crusher 3; the stone crushed by the first crusher 3 and the machine-made sand crushed by the second crusher 4 are mixed.

[0117] According to the fineness modulus of fine sand, the particle size of machine-made sand is also adjusted:

[0118] The first crusher 3 and the second crusher 4 are jointly set as the first adjustment object;

[0119] The first crusher 3 and the second crusher 4 are controlled to crush according to the actual value of the rotation speed of the first adjustment object.

[0120] It can be understood that the first crusher 3 is used to crush the stone so that the stone can form machine-made sand of various particle sizes, and the second crusher 4 is used to crush the machine-made sand at the second discharge end of the distribution hopper 10, so that the excess machine-made sand generated in the preparation process of fine sand can be processed secondary and recycled, which effectively reduces the preparation cost of fine sand.

[0121] Among them, since the rotation speed of the second crusher 4 is greater than that of the first crusher 3, and the fineness modulus of the artificial sand at the second discharge end of the distribution hopper 10 is much smaller than the fineness modulus of the stone, the second crusher 4 can crush and shape the artificial sand at the second discharge end of the distribution hopper 10 to further improve the preparation quality of fine sand.

[0122] Since the first crusher 3 and the second crusher 4 are jointly set as the second adjustment object, the particle size of the machine-made sand can be adjusted more accurately, so that the preparation quality of the fine sand is higher.

[0123] It should be noted that the specific types of the first crusher 3 and the second crusher 4 can be set according to actual needs without limitation. For example, the first crusher 3 can be a normal speed vertical shaft crusher, and the second crusher 4 can be a high speed vertical shaft crusher.

[0124] A fine sand belt conveyor may also be provided between the first crusher 3 and the vibrating feeder 2. By providing the fine sand belt conveyor, the flow rate of the stone material can be detected, thereby ensuring high-quality preparation of fine sand.

[0125] The manner of mixing the stone crushed by the first crusher 3 and the machine-made sand crushed by the second crusher 4 can be set according to actual needs, and there is no limitation to this. For example, the discharge ends of the first crusher 3 and the second crusher 4 are both connected to the feed ends of the belt conveyor, and the discharge end of the belt conveyor is connected to the feed end of the powder selector 5, and the stone crushed by the first crusher 3 and the machine-made sand crushed by the second crusher 4 are mixed on the belt conveyor.

[0126] The machine-made sand at the second discharge end of the distribution hopper 10 can be temporarily stored through the silo 1. At this time, a baffle is provided in the silo 1, which divides the silo 1 into a stone chamber and a machine-made sand chamber. The stone chamber is used for temporarily storing stones, and the machine-made sand chamber is used for temporarily storing machine-made sand.

[0127] Among them, the second discharge end of the distribution hopper 10 matched with the third screen, the fourth screen, etc. can be connected to the stone chamber so that the machine-made sand with a larger particle size can be crushed by the first crusher 3.

[0128] In the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0129] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0130] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0131] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A method for adjusting the quality of machine-made sand, characterized in that: include: Acquire machine-made sand, and divide the machine-made sand into first machine-made sand and second machine-made sand having different particle sizes; Mixing the first machine-made sand and the second machine-made sand into fine sand; adjusting the flow rate of the first machine-made sand and the flow rate of the second machine-made sand according to the fineness modulus of the fine sand, so that the fineness modulus of the fine sand approaches a set value; If the fineness modulus of the fine sand cannot reach the set value, adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand until the fineness modulus of the fine sand reaches the set value; The step of obtaining machine-made sand and dividing the machine-made sand into first machine-made sand and second machine-made sand with different particle sizes comprises: obtaining stone; crushing the stone by a crusher; classifying the crushed stone by a powder classifier to obtain the machine-made sand at the coarse powder discharge end of the powder classifier; and screening the machine-made sand by a screening machine to obtain the first machine-made sand and the second machine-made sand. The method of adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand includes: setting the crusher as the first adjustment object and setting the powder classifier as the second adjustment object; setting the initial values ​​of the rotation speeds of the first adjustment object and the second adjustment object; obtaining a first deviation value between the fineness modulus of the fine sand and the set value; selecting the corresponding first adjustment coefficient and second adjustment coefficient according to the first deviation value; multiplying the first adjustment coefficient by the initial value of the rotation speed of the first adjustment object to obtain the actual value of the rotation speed of the first adjustment object, and multiplying the second adjustment coefficient by the initial value of the rotation speed of the second adjustment object to obtain the first actual value of the rotation speed of the second adjustment object; controlling the crusher to perform crushing according to the actual value of the rotation speed of the first adjustment object, and controlling the powder classifier to perform classification according to the first actual value of the rotation speed of the second adjustment object; The method of obtaining machine-made sand and dividing the machine-made sand into first machine-made sand and second machine-made sand of different particle sizes also includes: removing dust from the feed end of the powder classifier and the feed end of the screening machine by a dust collector; the method of adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand also includes: setting the powder classifier and the dust collector together as a second adjustment object; and controlling the powder classifier to perform classification and the dust collector to perform dust removal according to the actual value of the first speed of the second adjustment object.

2. The method for adjusting the quality of machine-made sand according to claim 1, characterized in that: The mixing of the first machine-made sand and the second machine-made sand into fine sand comprises: delivering the first machine-made sand to a mixing point at a first flow rate; delivering the second machine-made sand to the mixing point at a second flow rate, so that the first machine-made sand and the second machine-made sand are mixed into the fine sand at the mixing point; The adjusting the flow rate of the first machine-made sand and the flow rate of the second machine-made sand according to the fineness modulus of the fine sand includes: obtaining a flow ratio between the first flow rate and the second flow rate; and adjusting the flow ratio so that the fineness modulus of the fine sand approaches a set value.

3. The method for adjusting the quality of machine-made sand according to claim 2, characterized in that: The mixing of the first machine-made sand and the second machine-made sand into fine sand comprises: conveying the first machine-made sand to a mixing point by a first quantitative belt conveyor at the first flow rate; conveying the second machine-made sand to a mixing point by a second quantitative belt conveyor at the second flow rate; The adjusting the flow ratio includes: adjusting the rotation speed of the first quantitative belt conveyor, and / or adjusting the rotation speed of the second quantitative belt conveyor.

4. The method for adjusting the quality of machine-made sand according to claim 1, characterized in that: The step of adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand further comprises: Setting a powder content threshold of the fine sand; Obtaining the powder content of the fine sand; Obtaining a second deviation value between the powder content of the fine sand and the powder content threshold; Selecting a corresponding third adjustment coefficient according to the second deviation value; multiplying the third adjustment coefficient by the initial value of the speed of the second adjustment object to obtain a second actual speed value of the second adjustment object; The dust collector is controlled to remove dust according to the second actual speed value of the second adjustment object.

5. The method for adjusting the quality of machine-made sand according to claim 1, characterized in that: The step of screening the machine-made sand by a screening machine to obtain the first machine-made sand and the second machine-made sand comprises: Screening the machine-made sand through a first sieve and a second sieve in sequence, wherein the mesh diameter of the first sieve is larger than the mesh diameter of the second sieve; collecting the machine-made sand passing through the second screen to obtain the first machine-made sand; The machine-made sand that has not passed through the second screen is divided into a dividing hopper, and the second machine-made sand is obtained at a first discharge end of the dividing hopper.

6. The method for adjusting the quality of machine-made sand according to claim 5, characterized in that: The crushing of the stone by a crusher includes: crushing the stone by a first crusher; crushing the machine-made sand at the second discharge end of the distribution hopper by a second crusher, wherein the rotation speed of the second crusher is greater than the rotation speed of the first crusher; mixing the stone crushed by the first crusher with the machine-made sand crushed by the second crusher; The method of adjusting the particle size of the machine-made sand according to the fineness modulus of the fine sand also includes: setting the first crusher and the second crusher together as a first adjustment object; and controlling the first crusher to crush and the second crusher to crush according to an actual value of the rotation speed of the first adjustment object.

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