CN113457817B - Fineness modulus control system of mechanism sand - Google Patents

Fineness modulus control system of mechanism sand Download PDF

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Publication number
CN113457817B
CN113457817B CN202110874094.5A CN202110874094A CN113457817B CN 113457817 B CN113457817 B CN 113457817B CN 202110874094 A CN202110874094 A CN 202110874094A CN 113457817 B CN113457817 B CN 113457817B
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screen
negative pressure
operational amplifier
resistor
input end
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CN113457817A (en
Inventor
葛志民
赵利敏
王海文
钱世裕
李娟�
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Handan Haoxiang New Building Materials Co ltd
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Handan Haoxiang New Building Materials Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

The invention relates to the technical field of building equipment, and provides a fineness modulus control system of machine-made sand, which comprises a feeding system, a sand making machine and a vibrating screen which are sequentially arranged, wherein the vibrating screen comprises a shell and a screen arranged in the shell, the shell is also connected with an excitation motor, a first outlet and a second outlet are arranged on the shell, the first outlet is connected with a feeding hole of the sand making machine, the second outlet is used for outputting finished product machine-made sand, and the vibrating screen also comprises: the upper cover is arranged on the shell; the negative pressure dust collector is arranged on the upper cover, a negative pressure adjusting unit, a first frequency converter and a negative pressure pump which are connected in sequence are arranged in the negative pressure dust collector, a first input end of the negative pressure adjusting unit is used for being connected with the controller, the negative pressure dust collector further comprises a negative pressure detection unit, the negative pressure detection unit is used for detecting gas pressure in the shell, and an output end of the negative pressure detection unit is connected with a second input end of the negative pressure adjusting unit. Through the technical scheme, the problem of poor fineness modulus control precision of the machine-made sand in the related technology is solved.

Description

Fineness modulus control system of mechanism sand
Technical Field
The invention relates to the technical field of construction equipment, in particular to a fineness modulus control system of machine-made sand.
Background
The conventional sand production system generally comprises a feeding system, a crusher, a sand making machine, a vibrating screen and the like which are sequentially arranged, wherein in the using process, stone materials supplied by the feeding system are crushed by the crusher, crushed fine stones are sent into the sand making machine to be further crushed into sand particles, the sand particles are screened out to obtain two kinds of stones through the vibrating screen, one kind of stones are stones passing through a screen of the vibrating screen, the other kind of stones are residual stones of the screen, the former kind of stones are cleaned by a sand washer to become finished product machine-made sand, and the latter kind of stones are sent into the sand making machine again to be further crushed.
The final use effect of the machine-made sand is determined by the particle size range (namely fineness modulus), and the current sand making equipment cannot accurately control the fineness modulus of the machine-made sand, so that the use effect is poor.
Disclosure of Invention
The invention provides a fineness modulus control system of machine-made sand, which solves the problem of poor fineness modulus control precision of the machine-made sand in the related technology.
The technical scheme of the invention is as follows: including the feeding system, system sand machine and the shale shaker that set gradually, the shale shaker includes the casing and sets up screen cloth in the casing, the casing still is connected with excitation motor, be provided with first export and second export on the casing, first export with system sand machine's feed inlet is connected, the second export is used for exporting finished product machine system sand, the shale shaker still includes:
an upper cover disposed on the housing;
a negative pressure dust collector arranged on the upper cover, a negative pressure adjusting unit, a first frequency converter and a negative pressure pump which are connected in sequence are arranged in the negative pressure dust collector, a first input end of the negative pressure adjusting unit is used for being connected with a controller,
the negative pressure adjusting device is characterized by further comprising a negative pressure detecting unit, wherein the negative pressure detecting unit is used for detecting the gas pressure in the shell, and the output end of the negative pressure detecting unit is connected with the second input end of the negative pressure adjusting unit.
Further, the negative pressure regulating unit comprises an operational amplifier U1A, a PMOS tube Q1, an NMOS tube Q2, an operational amplifier U2A, a triode Q4 and a capacitor C1,
the non-inverting input end of the operational amplifier U1A is used as the first input end of the negative pressure regulating unit, the inverting input end of the operational amplifier U1A is used as the second input end of the negative pressure regulating unit,
the grid electrodes of the PMOS tube Q1 and the NMOS tube Q2 are both connected with the output end of the operational amplifier U1A, the source electrode of the PMOS tube Q1 is connected with a power VCC, the drain electrode of the PMOS tube Q1 is connected with the drain electrode of the NMOS tube Q2 through a resistor R2 and a resistor R3 in sequence, the source electrode of the NMOS tube Q2 is grounded, the series point of the resistor R2 and the resistor R3 is connected with the anode of a capacitor C1, the anode of the capacitor C1 is also connected with the non-inverting input end of the operational amplifier U2A through a resistor R5, the cathode of the capacitor C1 is grounded, the inverting input end of the operational amplifier U2A is grounded through a resistor R14,
the output end of the operational amplifier U2A is connected with the base electrode of the triode Q4, the collector electrode of the triode Q4 is connected with a power supply VDD, the emitter electrode of the triode Q4 is connected to the analog ground through a resistor R8 and a capacitor C2 in sequence, the first end of the resistor R8 is connected to the inverting input end of the operational amplifier U2A through a resistor R7, the second end of the resistor R8 is connected to the non-inverting input end of the operational amplifier U2A through a resistor R6,
and the second end of the resistor R8 is used as the input of the voltage regulating unit and is connected to the analog input interface of the first frequency converter.
Further, the positive pole of electric capacity C1 with it puts still to be provided with fortune between the U2A and puts U1B, the non inverting input end that U1B was put to fortune with electric capacity C1's positive pole is connected, the inverting input end that U1B was put to fortune with U1B's output is connected, U1B's output is put to fortune inserts through resistance R5 the non inverting input end that U2A was put to fortune.
Further, the device also comprises an NMOS tube Q3, the grid electrode of the NMOS tube Q3 is used for being connected with a controller, the source electrode of the NMOS tube Q3 is grounded, and the drain electrode of the NMOS tube Q3 is connected to the positive electrode of the capacitor C1 through a resistor R4.
Further, U1C is put including the gas pressure sensor U3 and the fortune that connect gradually to negative pressure detection unit, gas pressure sensor sets up in the casing, potentiometre RP 1's first stiff end is connected to a-OUT end of gas pressure sensor U3, potentiometre RP 1's second stiff end is connected to another-OUT end of gas pressure sensor U3, potentiometre RP 1's slip end inserts through resistance R10U 1C's inverting input is put to fortune, gas pressure sensor U3's + OUT terminating is inserted U1C's in-phase input is put to fortune, U1C's output is put through resistance R9 the inverting input of U1C is put to fortune, U1C's output is put to fortune as negative pressure detection unit's output.
The vibration excitation motor further comprises a second frequency converter, wherein the input end of the second frequency converter is connected with an alternating current power supply, and the output end of the second frequency converter is connected with the input end of the vibration excitation motor.
Further, the screen cloth includes first screen cloth, second screen cloth, third screen cloth and the fourth screen cloth that sets gradually from the top down, the mesh diameter of first screen cloth, second screen cloth, third screen cloth and fourth screen cloth reduces in proper order.
Further, the second screen cloth is from the middle part for left screen cloth and right screen cloth, and the sieve mesh diameter of left screen cloth is greater than the sieve mesh diameter of right screen cloth, the middle part of second screen cloth is rotated and is provided with the baffle.
Furthermore, the sieve holes of the first sieve, the second sieve, the third sieve and the fourth sieve are all in a regular hexagon shape.
Further, the baffle includes board one and board two, the first end of board one rotates to be set up in the middle part of second screen cloth, the second end of board one with the first end sliding connection of board two, the second end removal of board two sets up in the bottom of first screen cloth.
Furthermore, guide rails are arranged at the bottom of the first screen along the length direction, the guide rails comprise two first guide rails which are symmetrically arranged, the first end of each first guide rail is connected with the bottom of the first screen, and the second end of each first guide rail is provided with a support plate;
further comprising:
the two ends of the rolling shaft are arranged on the two supporting plates in a rolling manner;
and the first end of the connecting rod is rotatably connected with the rolling shaft, and the second end of the connecting rod is hinged with the second plate.
Further, still include the connecting axle, the second end of board two is provided with the recess, the both ends setting of connecting axle is in the lateral wall of recess, the second end of connecting rod with the connecting axle is articulated.
Furthermore, the inside of the second plate is of a cavity structure, a sliding rail is arranged on the inner wall of the second plate along the length direction, a sliding block is arranged on the side face of the first plate, and the sliding block is used for moving along the sliding rail.
The working principle and the beneficial effects of the invention are as follows:
in the embodiment of the invention, the raw materials are sent into a sand making machine through a feeding system to be smashed and made into sand, sand grains with overlarge granularity are filtered out by a vibrating screen and sent into the sand making machine again through a first outlet to be smashed for the second time, and the sand grains meeting the requirements flow out through a second outlet to be processed into finished product machine-made sand. The upper cover is arranged on the shell, the negative pressure dust collector is arranged on the upper cover and used for sucking out sand grains with undersize grain sizes, the grain sizes of the sucked sand grains can be adjusted by adjusting the output power of the negative pressure dust collector, so that the grain sizes of finished product machine-made sand are adjusted within a set range, and the precise control of the fineness modulus of the machine-made sand is realized.
Wherein, the theory of operation of negative pressure cleaner does: the first input end of the negative pressure adjusting unit is used for receiving a pressure set value of the controller, the second input end of the negative pressure adjusting unit receives a current pressure value, the current pressure value is given by the negative pressure detecting unit, the negative pressure adjusting unit outputs an analog control instruction to an analog quantity input interface of the first frequency converter according to a difference value between the pressure set value and the current pressure value, the first frequency converter adjusts the output of the negative pressure pump according to the analog quantity input instruction, and finally the current pressure value received by the negative pressure adjusting unit is equal to the pressure set value, so that the control of the controller on the output power of the negative pressure dust collector is realized.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the overall construction of a vibrating screen according to the present invention;
FIG. 2 is a schematic diagram of the circuit of the vacuum cleaner of the present invention;
FIG. 3 is a schematic view (front view) of the internal structure of the housing according to the present invention;
FIG. 4 is a schematic view (side view) of the internal structure of the housing of the present invention;
FIG. 5 is an enlarged view of a portion A of FIG. 4;
in the figure: the device comprises a shell 1, a first outlet 101, a second outlet 102, an excitation motor 2, an upper cover 3, a negative pressure dust collector 4, a negative pressure adjusting unit 41, a negative pressure detecting unit 42, a screen 5, a first screen 51, a second screen 52, a third screen 53, a fourth screen 54, a partition plate 6, a first plate 61, a second plate 62, a groove 621, a first guide rail 71, a supporting plate 711, a rolling shaft 8, a connecting rod 9, a connecting shaft 10 and a rotating motor 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall relate to the scope of protection of the present invention.
As shown in fig. 1 to 5, the control system of this embodiment includes a feeding system, a sand making machine, and a vibrating screen that are sequentially arranged, where the vibrating screen includes a casing 1 and a screen 5 that is arranged in the casing 1, the casing 1 is further connected to a vibration excitation motor 2, the casing 1 is provided with a first outlet 101 and a second outlet 102, the first outlet 101 is connected to a feeding port of the sand making machine, the second outlet 102 is used for outputting finished product machine-made sand, and the vibrating screen further includes:
an upper cover 3 provided on the housing 1;
a negative pressure dust collector 4 arranged on the upper cover 3, a negative pressure adjusting unit 41, a first frequency converter and a negative pressure pump which are connected in sequence are arranged in the negative pressure dust collector 4, a first input end of the negative pressure adjusting unit 41 is used for being connected with a controller,
the gas pressure regulating device further comprises a negative pressure detecting unit 42, the negative pressure detecting unit 42 is used for detecting the gas pressure in the shell 1, and the output end of the negative pressure detecting unit 42 is connected with the second input end of the negative pressure regulating unit 41.
In this embodiment, the raw material is sent into a sand making machine through a feeding system to be crushed to make sand, sand grains with an excessive size are filtered by a vibrating screen, and are sent into the sand making machine again through a first outlet 101 to be crushed for the second time, and sand grains meeting requirements flow out through a second outlet 102 to be processed into finished product machine-made sand. The upper cover 3 is arranged on the shell 1, the negative pressure dust collector 4 is arranged on the upper cover 3 and used for sucking out sand grains with undersize grain sizes, and the output power of the negative pressure dust collector 4 is adjusted to adjust the grain sizes of the sucked sand grains, so that the grain sizes of finished product machine-made sand are adjusted within a set range, and the fineness modulus of the machine-made sand is accurately controlled.
Wherein, the working principle of the negative pressure dust collector 4 is as follows: the first input end of the negative pressure adjusting unit 41 is used for receiving a pressure given value of the controller, the second input end of the negative pressure adjusting unit 41 receives a current pressure value, the current pressure value is given by the negative pressure detecting unit 42, the negative pressure adjusting unit 41 outputs an analog control instruction to an analog input interface of the first frequency converter according to a difference value between the pressure given value and the current pressure value, the first frequency converter adjusts the output of the negative pressure pump according to the analog input instruction, and finally the current pressure value received by the negative pressure adjusting unit 41 is equal to the pressure given value, so that the controller controls the output power of the negative pressure cleaner 4.
Further, the negative pressure adjusting unit 41 comprises an operational amplifier U1A, a PMOS tube Q1, an NMOS tube Q2, an operational amplifier U2A, a triode Q4 and a capacitor C1,
the non-inverting input terminal of the operational amplifier U1A serves as the first input terminal of the negative pressure adjusting unit 41, the inverting input terminal of the operational amplifier U1A serves as the second input terminal of the negative pressure adjusting unit 41,
the grid electrodes of the PMOS tube Q1 and the NMOS tube Q2 are both connected with the output end of the operational amplifier U1A, the source electrode of the PMOS tube Q1 is connected with a power supply VCC, the drain electrode of the PMOS tube Q1 is connected with the drain electrode of the NMOS tube Q2 through a resistor R2 and a resistor R3 in sequence, the source electrode of the NMOS tube Q2 is grounded, the series point of the resistor R2 and the resistor R3 is connected with the anode of a capacitor C1, the anode of the capacitor C1 is also connected with the non-inverting input end of the operational amplifier U2A through a resistor R5, the cathode of the capacitor C1 is grounded, the inverting input end of the operational amplifier U2A is grounded through a resistor R14,
the output end of the operational amplifier U2A is connected with the base electrode of a triode Q4, the collector electrode of the triode Q4 is connected with a power supply VDD, the emitter electrode of the triode Q4 is connected to the analog ground through a resistor R8 and a capacitor C2 in sequence, the first end of the resistor R8 is connected to the inverting input end of the operational amplifier U2A through a resistor R7, the second end of the resistor R8 is connected to the non-inverting input end of the operational amplifier U2A through a resistor R6,
the second end of the resistor R8 is used as the input of the voltage regulating unit and is connected to the analog input interface of the first frequency converter.
The working principle of the negative pressure adjusting unit 41 is as follows: when the current pressure value is smaller than the given pressure value, the operational amplifier U1A outputs a high level signal, the NMOS tube Q2 is conducted, the capacitor C1 discharges through the resistor R3 and the NMOS tube Q2, and the end voltage of the capacitor C1 is reduced; the operational amplifier U2A and the triode Q4 form a voltage-current conversion circuit, and the terminal voltage of the capacitor C1 outputs an analog quantity signal AO after passing through the voltage-current conversion circuit; the analog current signal AO is used as an analog quantity input instruction and input to an AI port of the first frequency converter, and along with the reduction of the voltage of the capacitor C1 end, the analog current signal AO is reduced, the output power of the frequency converter is reduced, and the output power of the negative pressure pump is controlled to be reduced; on the contrary, when the current pressure value is greater than the pressure given value, the operational amplifier U1A outputs a low level signal, the PMOS tube Q1 is conducted, the power supply VCC charges the capacitor C1 through the PMOS tube Q1 and the resistor R2, the end voltage of the capacitor C1 is increased, the analog quantity signal AO output by the voltage-current conversion circuit is increased, the output power of the frequency converter is increased, and the output power of the negative pressure pump is controlled to be increased.
The working principle of the voltage-current conversion circuit is as follows: note that the voltage of the non-inverting input terminal of the operational amplifier U2A is UP, the voltage of the inverting input terminal is UN, the voltage of the first terminal of the resistor R8 is Uout, and the voltage of the second terminal is Uo.
As can be seen from the virtual-off characteristic of the operational amplifier,
at the non-inverting input of the operational amplifier U2A:
Figure GDA0003830645820000051
to obtain
Figure GDA0003830645820000052
At the inverting input of the operational amplifier U2A:
Figure GDA0003830645820000053
to obtain
Figure GDA0003830645820000054
Since UP = UN, the number of bits is,
so that:
Figure GDA0003830645820000055
Figure GDA0003830645820000061
and the following steps:
Figure GDA0003830645820000062
resistance R6=100K, very large, so can be approximately calculated as:
Figure GDA0003830645820000063
substituting equation (1) into equation (2) with resistance R5= R14 and resistance R6= R7 yields:
Figure GDA0003830645820000064
the conversion of the input voltage Uin to the output current Io is achieved.
Further, U1B is put to still being provided with fortune between U2A is put to electric capacity C1's positive pole and fortune, and U1B's in-phase input end and electric capacity C1's positive pole are connected to fortune, and U1B's inverting input end and fortune are put U1B's output and are connected to fortune, and U2A's in-phase input end is put through resistance R5 access fortune to fortune output that U1B was put.
The operational amplifier U1B forms a voltage follower circuit, a charge-discharge loop of the capacitor C1 is isolated from a voltage-current conversion circuit formed by the operational amplifier U2A, and the influence of an input resistor of the voltage-current conversion circuit on a charge-discharge time constant of the capacitor C1 is avoided.
Further, the power supply further comprises an NMOS tube Q3, the grid electrode of the NMOS tube Q3 is used for being connected with the controller, the source electrode of the NMOS tube Q3 is grounded, and the drain electrode of the NMOS tube Q3 is connected to the anode of the capacitor C1 through a resistor R4.
The capacitance of the capacitor C1 is relatively large, when the negative pressure dust collector 4 stops working, the capacitor C1 needs to be discharged, the resistance value of the resistor R3 is very large, and if the capacitor C1 discharges through the resistor R3, the discharging speed is very slow, which is not the expected situation; in this embodiment, by setting the NMOS tube Q3 and the resistor R4, the resistance of the resistor R4 is set to 1K, when the controller controls the negative pressure cleaner 4 to stop working, the NMOS tube Q3 is controlled to be turned on at the same time, and the capacitor C1 discharges through the resistor R4 and the NMOS tube Q3, thereby realizing rapid discharge of the capacitor C1.
Further, the negative pressure detection unit 42 comprises a gas pressure sensor U3 and an operational amplifier U1C which are sequentially connected, the gas pressure sensor is arranged in the shell 1, one-OUT end of the gas pressure sensor U3 is connected with a first fixed end of the potentiometer RP1, the other-OUT end of the gas pressure sensor U3 is connected with a second fixed end of the potentiometer RP1, a sliding end of the potentiometer RP1 is connected with an inverse phase input end of the operational amplifier U1C through a resistor R10, the + OUT end of the gas pressure sensor U3 is connected with an in-phase input end of the operational amplifier U1C, an output end of the operational amplifier U1C is connected with the inverse phase input end of the operational amplifier U1C through a resistor R9, and an output end of the operational amplifier U1C is used as an output end of the negative pressure detection unit 42.
The gas pressure sensor U3 is used for detecting the air pressure in the shell 1, the operational amplifier U1C forms a subtraction operation circuit, two-OUT ends of the gas pressure sensor U3 are connected to the inverting input end of the operational amplifier U1C through a potentiometer RP1, and the potentiometer RP1 is used for fine adjustment of amplification factors; and the + OUT end of the gas pressure sensor U3 is connected with the non-inverting input end of the operational amplifier U1C, the voltage of the inverting input end of the operational amplifier U1C and the voltage of the non-inverting input end are subjected to subtraction operation to obtain a current pressure value, and the current pressure value is connected with the inverting input end of the operational amplifier U1A.
And further, the vibration excitation control device also comprises a second frequency converter, wherein the input end of the second frequency converter is connected with the alternating current power supply, and the output end of the second frequency converter is connected with the input end of the vibration excitation motor 2.
The power supply of the exciting motor 2 is provided by the second frequency converter, and the rotating speed of the exciting motor 2 can be adjusted by adjusting the output frequency of the second frequency converter, so that the vibration frequency of the vibrating screen can be adjusted. When the vibration frequency is accelerated, dust with too small particle size in the machine-made sand is favorably lifted and is timely sucked out by the negative pressure dust collector 4, the excitation motor 2 and the negative pressure dust collector 4 are matched with each other, and the screened finished product machine-made sand is cleaner.
Further, the mesh 5 includes a first mesh 51, a second mesh 52, a third mesh 53, and a fourth mesh 54 which are arranged in this order from top to bottom, and the mesh diameters of the first mesh 51, the second mesh 52, the third mesh 53, and the fourth mesh 54 are reduced in this order.
The screen cloth 5 is set to be a four-layer structure, and the diameters of screen holes of the four-layer screen cloth 5 are sequentially reduced from top to bottom, so that the machine-made sand is filtered layer by layer, and the proportion of various particle sizes is reasonably configured.
Further, second screen cloth 52 is left screen cloth and right screen cloth from the middle part, and the sieve mesh diameter of left screen cloth is greater than the sieve mesh diameter of right screen cloth, and the middle part of second screen cloth 52 is rotated and is provided with baffle 6.
The diameters of the sieve pores on the left side and the right side of the second sieve 52 are different, so that the machine-made sand with different particle sizes is further screened, and the fine control of fineness modulus is facilitated; through the angle of adjusting baffle 6, can adjust the quantity of the mechanism sand through left screen cloth and right screen cloth, and then be favorable to adjusting the particle size content of finished product mechanism sand.
Further, the mesh openings of the first, second, third and fourth screens 51, 52, 53 and 54 are all regular hexagons.
The screen holes of the first screen 51, the second screen 52, the third screen 53 and the fourth screen 54 are designed to be regular hexagons, so that the blocking of the screen holes by materials can be reduced, and the working efficiency of the vibrating screen is improved.
Further, the partition 6 comprises a first plate 61 and a second plate 62, wherein a first end of the first plate 61 is rotatably disposed in the middle of the second screen 52, a second end of the first plate 61 is slidably connected with a first end of the second plate 62, and a second end of the second plate 62 is movably disposed at the bottom of the first screen 51.
The partition 6 is provided with a structure that the first plate 61 and the second plate 62 are slidably connected, and the second end of the second plate 62 is movably arranged at the bottom of the first screen 51, so that when the angle of the partition 6 needs to be adjusted, the first plate 61 is rotated, and the first plate 61 drives the second plate 62 to move along the bottom of the first screen 51.
Specifically, the rotating shaft of the first plate 61 is connected with the rotating motor 11-, and the rotating angle of the first plate 61 is controlled by controlling the rotating direction and the rotating angle of the rotating motor 11-. When the rotating motor 11-rotates to a set angle, the output of the rotating motor 11-is locked, the angle of the first plate 61 is locked, and the angle of the whole partition plate 6 is locked.
Further, guide rails are arranged at the bottom of the first screen 51 along the length direction, the guide rails comprise two first guide rails 71 which are symmetrically arranged, a first end of each first guide rail 71 is connected with the bottom of the first screen 51, and a support plate 711 is arranged at a second end of each first guide rail 71;
further comprising:
the two ends of the roller 8 are arranged on the two supporting plates 711 in a rolling manner;
and a first end of the connecting rod 9 is rotatably connected with the roller 8, and a second end of the connecting rod 9 is hinged with the second plate 62.
Two first guide rails 71 are symmetrically arranged at the bottom of the first screen 51, the first guide rails 71 are provided with supporting plates 711, the rollers 8 are arranged on the supporting plates 711 in a rolling mode, and the rollers 8 roll the second ends of the second driving plates 62 to move along the guide rails, so that the structure is simple, and the installation is reliable.
Specifically, a through hole is formed in the first end of the connecting rod 9, and the connecting rod 9 is sleeved in the middle of the roller 8 through the through hole, so that the connecting rod 9 is rotatably connected with the roller 8.
Further, the connecting device further comprises a connecting shaft 10, a groove 621 is formed in the second end of the second plate 62, two ends of the connecting shaft 10 are arranged on the side wall of the groove 621, and the second end of the connecting rod 9 is hinged to the connecting shaft 10.
Through set up recess 621 at the second end of board two 62, and set up the both ends of connecting axle 10 at the lateral wall of recess 621, the second end of connecting rod 9 is provided with the through-hole equally, and connecting rod 9 establishes the middle part at connecting axle 10 with the help of the through-hole cover, realizes the articulated of connecting rod 9 and connecting axle 10.
Further, the inside of the second plate 62 is of a cavity structure, a sliding rail is arranged on the inner wall of the second plate 62 along the length direction, and a sliding block is arranged on the side face of the first plate 61 and used for moving along the sliding rail.
The second plate 62 is sleeved outside the first plate 61, so that the second plate 62 is connected with the first plate 61 in a sliding manner; further, when the first plate 61 rotates, the sliding block moves along the sliding rail, so that the overall length of the first plate 61 and the second plate 62 is adjusted to meet the requirement of angle change of the first plate 61; and the connecting mode of the sliding block and the sliding rail is favorable for reducing the friction force between the first plate 61 and the second plate 62, and the second plate 62 are prevented from being abraded.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a fineness modulus control system of mechanism sand, is including feeding system, system sand machine and the shale shaker that sets gradually, the shale shaker includes casing (1) and sets up screen cloth (5) in casing (1), casing (1) still is connected with excitation motor (2), be provided with first export (101) and second export (102) on casing (1), first export (101) with the feed inlet of system sand machine is connected, second export (102) are used for exporting finished product machine system sand, a serial communication port, the shale shaker still includes:
an upper cover (3) provided on the housing (1);
the negative pressure dust collector (4) is arranged on the upper cover (3), a negative pressure adjusting unit (41), a first frequency converter and a negative pressure pump which are sequentially connected are arranged in the negative pressure dust collector (4), a first input end of the negative pressure adjusting unit (41) is used for being connected with a controller,
the gas pressure regulating device further comprises a negative pressure detecting unit (42), the negative pressure detecting unit (42) is used for detecting the gas pressure in the shell (1), the output end of the negative pressure detecting unit (42) is connected with the second input end of the negative pressure regulating unit (41),
the negative pressure adjusting unit (41) comprises an operational amplifier U1A, a PMOS tube Q1, an NMOS tube Q2, an operational amplifier U2A, a triode Q4 and a capacitor C1,
the non-inverting input end of the operational amplifier U1A is used as the first input end of the negative pressure regulating unit (41), the inverting input end of the operational amplifier U1A is used as the second input end of the negative pressure regulating unit (41),
the grid electrodes of the PMOS tube Q1 and the NMOS tube Q2 are connected with the output end of the operational amplifier U1A, the source electrode of the PMOS tube Q1 is connected with a power VCC, the drain electrode of the PMOS tube Q1 is connected with the drain electrode of the NMOS tube Q2 sequentially through a resistor R2 and a resistor R3, the source electrode of the NMOS tube Q2 is grounded, the serial point of the resistor R2 and the resistor R3 is connected with the positive electrode of a capacitor C1, the positive electrode of the capacitor C1 is also connected with the in-phase input end of the operational amplifier U2A through a resistor R5, the negative electrode of the capacitor C1 is grounded, the inverting input end of the operational amplifier U2A is grounded through a resistor R14,
the output end of the operational amplifier U2A is connected with the base electrode of the triode Q4, the collector electrode of the triode Q4 is connected with a power supply VDD, the emitter electrode of the triode Q4 is connected to a simulation ground through a resistor R8 and a capacitor C2 in sequence, the first end of the resistor R8 is connected to the inverting input end of the operational amplifier U2A through a resistor R7, the second end of the resistor R8 is connected to the non-inverting input end of the operational amplifier U2A through a resistor R6,
and the second end of the resistor R8 is used as the input of the voltage regulating unit and is connected to the analog input interface of the first frequency converter.
2. The fineness modulus control system of machine-made sand according to claim 1, wherein an operational amplifier U1B is further arranged between the positive electrode of the capacitor C1 and the operational amplifier U2A, the in-phase input end of the operational amplifier U1B is connected with the positive electrode of the capacitor C1, the reverse-phase input end of the operational amplifier U1B is connected with the output end of the operational amplifier U1B, and the output end of the operational amplifier U1B is connected to the in-phase input end of the operational amplifier U2A through a resistor R5.
3. The system for controlling fineness modulus of machine-made sand according to claim 1, further comprising an NMOS transistor Q3, wherein a gate of the NMOS transistor Q3 is used for being connected with a controller, a source of the NMOS transistor Q3 is grounded, and a drain of the NMOS transistor Q3 is connected to the positive electrode of the capacitor C1 through a resistor R4.
4. The fineness modulus control system of machine-made sand according to claim 1, wherein the negative pressure detection unit (42) comprises a gas pressure sensor U3 and an operational amplifier U1C which are connected in sequence, the gas pressure sensor is arranged in the shell (1), one-OUT end of the gas pressure sensor U3 is connected with a first fixed end of a potentiometer RP1, the other-OUT end of the gas pressure sensor U3 is connected with a second fixed end of the potentiometer RP1, a sliding end of the potentiometer RP1 is connected with an inverted input end of the operational amplifier U1C through a resistor R10, a + OUT end of the gas pressure sensor U3 is connected with an in-phase input end of the operational amplifier U1C, an output end of the operational amplifier U1C is connected with an inverted input end of the operational amplifier U1C through a resistor R9, and an output end of the operational amplifier U1C is used as an output end of the negative pressure detection unit (42).
5. The fineness modulus control system of a manufactured sand of claim 1, further comprising a second frequency converter, wherein an input end of the second frequency converter is connected with an alternating current power supply, and an output end of the second frequency converter is connected with an input end of the excitation motor (2).
6. A fineness modulus control system of mechanism sand according to claim 1, characterized in that, the screen (5) comprises a first screen (51), a second screen (52), a third screen (53) and a fourth screen (54) which are arranged from top to bottom, the screen hole diameters of the first screen (51), the second screen (52), the third screen (53) and the fourth screen (54) are reduced in turn.
7. A fineness modulus control system of mechanism sand according to claim 6, characterized in that, the second screen (52) is divided into left screen and right screen from the middle, the screen hole diameter of left screen is larger than the screen hole diameter of right screen, the middle of the second screen (52) is provided with baffle (6) in a rotating way.
8. A fineness modulus control system of mechanism sand according to claim 6 or 7, characterized in that the meshes of the first screen (51), the second screen (52), the third screen (53) and the fourth screen (54) are all regular hexagons.
9. A fineness modulus control system of machine-made sand according to claim 7, characterized in that, the baffle (6) comprises a plate one (61) and a plate two (62), the first end of the plate one (61) is rotatably arranged at the middle part of the second screen (52), the second end of the plate one (61) is connected with the first end of the plate two (62) in a sliding way, and the second end of the plate two (62) is movably arranged at the bottom of the first screen (51).
CN202110874094.5A 2021-07-30 2021-07-30 Fineness modulus control system of mechanism sand Active CN113457817B (en)

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Publication number Priority date Publication date Assignee Title
CN104607388A (en) * 2013-11-04 2015-05-13 上海世邦机器有限公司 Automatic manufactured sand gradation fine controller
CN104556762B (en) * 2014-12-18 2017-04-26 北京金隅水泥节能科技有限公司 Tower-type machine-made sand preparation and grading adjustment system
CN108722650B (en) * 2018-07-12 2023-06-20 福建南方路面机械股份有限公司 Online adjustment device and method for fineness modulus of machine-made sand
CN109848043A (en) * 2019-03-12 2019-06-07 荆州市宇中粮食机械有限公司 A kind of environment-friendly type intelligent pneumatic jig one descaling machine
CN210846721U (en) * 2019-10-31 2020-06-26 甘肃建投矿业有限公司 System for preparing machine-made sand

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