CN112642702A - High-efficient double-deck multistage shale shaker - Google Patents
High-efficient double-deck multistage shale shaker Download PDFInfo
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- CN112642702A CN112642702A CN202110008331.XA CN202110008331A CN112642702A CN 112642702 A CN112642702 A CN 112642702A CN 202110008331 A CN202110008331 A CN 202110008331A CN 112642702 A CN112642702 A CN 112642702A
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- screen
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- 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
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- 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
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- 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
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
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- 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
- B07B2201/00—Details applicable to machines for screening using sieves or gratings
- B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens
Abstract
The invention discloses a high-efficiency double-layer multistage vibrating screen which comprises a base, a rack, an upper-layer fixed screen box, an upper-layer floating screen box, a lower-layer fixed screen box, a lower-layer floating screen box and an excitation motion device, wherein the upper-layer fixed screen box is arranged on the rack; the upper-layer floating sieve box and the lower-layer floating sieve box are respectively installed on the frame in a hanging mode through a plurality of upper-layer elastic hanging rods and lower-layer elastic hanging rods which are arranged in a bilateral symmetry mode, and a flexible sieve mesh is connected between two adjacent sieve mesh support frames of the upper-layer fixed sieve box, the upper-layer floating sieve box, the lower-layer fixed sieve box and the lower-layer floating sieve box; the excitation motion device comprises an eccentric excitation shaft, a driving exciter, a driven exciter, a spring guide device, a fixed frame, an upper limit guide sliding mechanism, a lower limit guide sliding mechanism, an upper transmission rod, a lower transmission rod and a steering rod. The dry-type high-efficiency screening method can realize dry-type high-efficiency screening of the material which is difficult to screen and has larger viscosity on the premise of better, fast and comprehensive layering screening of material particles, improves the screening probability of fine particle materials, and is particularly suitable for raw coal grading screening in the coal dressing process.
Description
Technical Field
The invention relates to a vibrating screen, in particular to a high-efficiency double-layer multistage vibrating screen suitable for dry screening of coal with complex particle size composition, and belongs to the technical field of vibrating screens.
Background
Coal dressing is a processing process of removing non-coal substances in raw coal by utilizing the difference of the density or surface characteristics of coal and other mineral substances, and dividing the raw coal into products with different qualities and specifications according to the granularity of the coal. Coal dressing can improve coal quality, reduce smoke and dust amount of coal combustion, and is beneficial to environmental protection.
The coal dressing is generally that the raw coal is graded and screened firstly, and then non-coal substances in the raw coal are removed by methods such as gravity coal dressing or floating coal dressing, and the high-efficiency grading and screening has important significance in the aspects of energy conservation, environmental protection and improvement of coal economic benefit. Raw coal classification screening usually adopts the shale shaker to carry out the screening, and the main problem that present shale shaker exists is that screening performance is not strong, and screening efficiency is lower, therefore improves screening efficiency and increases the handling capacity and all is the target of vibration screening always.
The traditional method for improving the screening performance of the vibrating screen mainly adopts the method of enlarging the vibrating screen (increasing the screening area) and improving the vibration strength (increasing the screening speed), and the traditional method can not avoid the problems of structural strength, fatigue life and reliability of the vibrating screen. In addition, the existing raw coal vibrating screen mostly adopts single-layer screening, when the particle size is complex, the single-layer screening efficiency is not ideal, when the material bed thickness is large, the single-layer screening process is mixed with fine particles with complex particle size and is affected by blocking particles, and the fine particles cannot completely pass through the screen, the single-layer screening enables the complex particle size particles to reduce the probability of fine particle passing through the screen, the screening performance is low, and the using requirement cannot be met.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the high-efficiency double-layer multistage vibrating screen which can realize dry-type high-efficiency screening of materials which are difficult to screen and have high viscosity on the premise of realizing better, rapid and comprehensive layered screening of material particles and improve the screening passing probability of fine particle materials, and is particularly suitable for raw coal classified screening in the coal dressing process.
In order to realize the aim, the high-efficiency double-layer multistage vibrating screen comprises a base, a frame, an upper layer fixed screen box, an upper layer floating screen box, a lower layer fixed screen box, a lower layer floating screen box and an excitation motion device;
the frame is of a frame structure, and the whole frame is positioned and installed on the base through a plurality of damping spring groups which are vertically guided and telescopically arranged; the upper layer fixed sieve box and the lower layer fixed sieve box are respectively and correspondingly fixedly arranged at the middle part and the lower part of the frame up and down, the upper layer floating sieve box and the lower layer floating sieve box are respectively and correspondingly arranged on the frame through a plurality of upper layer elastic suspension rods and lower layer elastic suspension rods which are arranged in bilateral symmetry, the upper layer floating sieve box and the lower layer floating sieve box are respectively and correspondingly arranged right above the upper layer fixed sieve box and the lower layer fixed sieve box up and down, two ends of the upper layer elastic suspension rods which can freely stretch up and down and reset are respectively and correspondingly arranged at the tops of the upper layer floating sieve box and the frame through hinge shafts which are arranged along the left and right direction in the axial direction, and two ends of the lower layer elastic suspension rods which can freely stretch up and down and reset are respectively and correspondingly arranged at the middle parts of the lower layer floating sieve box and the frame through hinge shafts which; screen mesh support frames are uniformly and alternately arranged on the upper fixed screen box, the upper floating screen box, the lower fixed screen box and the lower floating screen box from front to back, a coarse-hole flexible screen mesh is connected between two adjacent screen mesh support frames of the upper fixed screen box and the upper floating screen box, and a fine-hole flexible screen mesh is connected between two adjacent screen mesh support frames of the lower fixed screen box and the lower floating screen box;
the vibration excitation motion device comprises an eccentric vibration excitation shaft, a driving vibration exciter, a driven vibration exciter, a spring guide device, a fixed frame, an upper limit guide sliding mechanism, a lower limit guide sliding mechanism, an upper transmission rod, a lower transmission rod and a steering rod; the fixed frame is fixedly arranged on the frame and is positioned above the upper-layer floating sieve box; the active vibration exciter with the box-type structure is positioned in the frame of the fixed frame; the spring guide devices are arranged in a plurality of numbers and comprise vertical spring guide devices and transverse spring guide devices, and the vertical spring guide devices and the transverse spring guide devices respectively comprise guide shafts and pressure springs sleeved on the guide shafts; the driven vibration exciter with a frame structure is arranged between the driving vibration exciter and the fixed frame, and is connected with the fixed frame through transverse spring guide devices which are symmetrically arranged front and back, and is connected with the driving vibration exciter through vertical spring guide devices which are symmetrically arranged up and down; the upper and lower limiting guide sliding mechanisms are arranged between the driven vibration exciter and the fixed frame and positioned right below the driving vibration exciter, the guide sliding directions of the upper and lower limiting guide sliding mechanisms are arranged along the front and back directions, and the upper and lower limiting guide sliding mechanisms are connected with the driven vibration exciter through upper and lower limiting sliding blocks matched with the upper and lower limiting guide sliding mechanisms; an eccentric excitation shaft arranged along the left and right directions in the axial direction is horizontally erected and installed in the active vibration exciter through a bearing, an eccentric block is arranged on the eccentric excitation shaft, the shaft end of the eccentric excitation shaft is in transmission connection with an excitation driving motor through a coupler, and the excitation driving motor is fixedly installed on a rack or is installed on the ground through a support frame; two ends of an upper-layer transmission rod which is vertically arranged are respectively and fixedly arranged on the active vibration exciter and the upper-layer floating sieve box; the top end of the lower transmission rod which is vertically arranged is fixedly arranged on the driven vibration exciter, the bottom end of the lower transmission rod is hinged with the top end of the vertically arranged steering rod, the bottom end of the steering rod is hinged with the lower floating sieve box, and the middle part of the rod body of the steering rod is hinged with the frame.
As a further improvement scheme of the invention, the upper layer elastic suspension rod and the lower layer elastic suspension rod respectively comprise a telescopic rod and a telescopic guide sleeve which are coaxially arranged, the bottom of the telescopic rod positioned in the telescopic guide sleeve is provided with a piston structure matched with the inner diameter of the telescopic guide sleeve, and the upper part and the lower part of the piston structure are respectively provided with a return spring which is propped against the telescopic guide sleeve.
As a preferred embodiment of the present invention, the coarse and fine flexible screens are polyurethane flexible screens.
As a further improvement scheme of the invention, the front end or the rear end of the lower layer floating sieve box is provided with a balancing weight.
As a further improvement scheme of the invention, the top end hinge pin shafts of the upper layer elastic suspension rods which are arranged in bilateral symmetry are arranged on the frame through a bearing group, and the top end hinge pin shafts of the two upper layer elastic suspension rods which are arranged in bilateral symmetry share the same hinge pin shaft.
As a further improvement scheme of the invention, the installation assemblies of the vibration excitation motion devices, which comprise a driving vibration exciter, a driven vibration exciter, a spring guide device, a fixed frame, an upper limit guide sliding mechanism, a lower limit guide sliding mechanism, an upper transmission rod, a lower transmission rod and a steering rod, are at least arranged into two groups in a bilateral symmetry way relative to the rack, the installation assemblies of the two groups of vibration excitation motion devices share the same eccentric vibration excitation shaft, and the upper transmission rod, the lower transmission rod and the steering rod of the installation assemblies of the two groups of vibration excitation motion devices are respectively arranged corresponding to the left side surface and the right side surface of the upper floating sieve.
As a further improvement scheme of the invention, a plurality of rod body hinge holes are formed in the rod body of the steering rod along the length direction of the steering rod, and a plurality of rack hinge holes are formed in the rack at positions corresponding to the rod body hinge holes of the steering rod.
In one embodiment of the present invention, the upper and lower limiting guiding sliding mechanisms are T-shaped groove structures or dovetail groove structures protruding from the fixing frame, or T-shaped groove structures or dovetail groove structures directly arranged on the fixing frame.
As a preferable scheme of the invention, the damping spring set is of a rubber spring structure.
As a further improvement of the invention, the coverage area size of the fine-hole flexible screen cloth of at least the lower floating screen box along the front-back direction is larger than that of the coarse-hole flexible screen cloth of the upper floating screen box along the front-back direction.
Compared with the prior art, the high-efficiency double-layer multistage vibrating screen drives the driving vibration exciter to do elliptic motion by the inertia force generated by the rotary motion of the eccentric vibration exciting shaft, the driving vibration exciter drives the upper-layer floating screen box to do elliptic motion by the upper-layer transmission rod, meanwhile, the driven vibration exciter follows the elliptic motion of the driving vibration exciter to do horizontal reciprocating motion along the front-back direction under the limitation of the spring guide device and the upper-lower limiting guide sliding mechanism, the driven vibration exciter drives the steering rod to swing by the lower-layer transmission rod, the steering rod transmits the horizontal reciprocating motion opposite to the motion direction of the driven vibration exciter to the lower-layer floating screen box, and further the lower-layer floating screen box horizontally reciprocates in the opposite direction relative to the driven vibration exciter, so that the upper-layer floating screen box and the lower-layer floating screen box respectively move in different directions relative to the upper-layer fixed, Alternate relative motion is carried out according to the track and the speed, so that the coarse flexible screen and the fine flexible screen do periodic loosening-tensioning motion to carry out material screening, the repulsion force generated by contraction of the upper elastic suspension rod group and the lower elastic suspension rod group in the motion process of the upper floating screen box and the lower floating screen box can realize not only the supporting function but also the vibration damping function, the coarse flexible screen of the upper floating screen box moves in an elliptic track to enable the particles which are just fed to be screened to be better and comprehensively layered, the fine flexible screen of the lower floating screen box moves in a horizontal linear track to realize the rapid and stable secondary grading screening, the amplitude and the elasticity generated by the alternate motion of the upper floating screen box and the lower floating screen box and the relaxation motion of the coarse flexible screen and the fine flexible screen can improve the screening penetration probability of the multistage screening of fine particle materials, The dry-type high-efficiency screening device has the advantages that the screening efficiency and the processing capacity are improved, the dry-type high-efficiency screening of materials which are difficult to screen and have high viscosity can be completed, the low energy consumption ratio, the large processing capacity, the small noise and the controllable amplitude can be realized, and the dry-type high-efficiency screening device is particularly suitable for grading and screening of raw coal in the coal dressing process.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a schematic diagram of the structure of the excited motion device of the present invention;
FIG. 5 is a schematic structural diagram of the driven vibration exciter of the present invention when driving the steering rod to swing;
fig. 6 is a schematic structural view of the upper layer elastic suspension rod of the present invention.
In the figure: 1-a base, 2-a damping spring group, 3-a lower layer fixed sieve box, 4-a lower layer floating sieve box, 5-an upper layer fixed sieve box, 6-an upper layer floating sieve box, 7-a frame, 8-an excitation motion device, 801-an eccentric excitation shaft, 802-a driving vibration exciter, 803-a driven vibration exciter, 804-a spring guide device, 805-a fixed frame, 806-an upper and lower limit guide sliding mechanism, 807-an upper layer transmission rod, 808-a lower layer transmission rod, 809-a steering rod, 9-a bearing group, 10-an upper layer elastic suspension rod, 11-a coarse hole flexible screen, 12-a lower layer elastic suspension rod, 13-a fine hole flexible screen, 14-a vertical beam, 15-an excitation drive motor, 16-a coupler and 17-a balancing weight, 18-beam.
Detailed Description
The present invention will be further explained with reference to the drawings (hereinafter, the left-right direction of fig. 1 will be described as the front-back direction).
As shown in fig. 1 to 3, the high-efficiency double-layer multistage vibrating screen includes a base 1, a frame 7, an upper fixed screen box 5, an upper floating screen box 6, a lower fixed screen box 3, a lower floating screen box 4, and an excitation motion device 8.
The frame 7 is a frame structure comprising vertical beams 14 and cross beams 18, the whole frame 7 is positioned and installed on the base 1 through a plurality of vertically-guided telescopic damping spring sets 2, and the damping spring sets 2 can be rubber spring flexible structures or rigid spring structures, preferably rubber spring flexible structures; the upper layer fixed screen box 5 and the lower layer fixed screen box 3 are respectively and correspondingly fixedly arranged at the middle part and the lower part of the frame 7 up and down, the upper layer floating screen box 6 and the lower layer floating screen box 4 are respectively and correspondingly arranged on the frame 7 through a plurality of upper layer elastic suspension rods 10 and lower layer elastic suspension rods 12 which are arranged in bilateral symmetry, the upper layer floating screen box 6 and the lower layer floating screen box 4 are respectively and correspondingly arranged right above the upper layer fixed screen box 5 and the lower layer fixed screen box 3 up and down, two ends of the upper layer elastic suspension rods 10 which can freely stretch up and down and reset are respectively and correspondingly arranged at the tops of the upper layer floating screen box 6 and the frame 7 through hinge shafts which are arranged along the left and right direction in the axial direction, two ends of the lower layer elastic suspension rods 12 which can freely stretch up and down and reset are respectively and correspondingly arranged at the middle parts of the lower layer floating screen box 4 and the frame 7 through hinge shafts which are arranged, as shown in fig. 6, the upper layer elastic suspension rod 10 and the lower layer elastic suspension rod 12 both include coaxially arranged telescopic rods and telescopic guide sleeves, a piston structure matched with the inner diameter of the telescopic guide sleeves is arranged at the bottom of the telescopic rods positioned in the telescopic guide sleeves, and return springs abutting against the telescopic guide sleeves are respectively arranged above and below the piston structure. Screen mesh support frames are uniformly and alternately arranged on the upper fixed screen box 5, the upper floating screen box 6, the lower fixed screen box 3 and the lower floating screen box 4 in a front-back uniform manner, a thick-hole flexible screen mesh 11 is connected between two adjacent screen mesh support frames of the upper fixed screen box 5 and the upper floating screen box 6, a thin-hole flexible screen mesh 13 is connected between two adjacent screen mesh support frames of the lower fixed screen box 3 and the lower floating screen box 4, the thick-hole flexible screen mesh 11 and the thin-hole flexible screen mesh 13 can be made of metal wire woven flexible screen meshes or polyurethane flexible screen meshes, and the polyurethane flexible screen mesh has the advantages of good wear resistance, long service life, high screening efficiency, noise reduction and the like, so the polyurethane flexible screen mesh is preferably selected; in order to adjust the amplitude, a balancing weight 17 is installed at the front end or the rear end of the lower floating sieve box 4.
As shown in fig. 4, the excitation motion device 8 includes an eccentric excitation shaft 801, a driving exciter 802, a driven exciter 803, a spring guide 804, a fixed frame 805, an upper and lower limit guide sliding mechanism 806, an upper transmission rod 807, a lower transmission rod 808 and a steering rod 809; the fixed frame 805 is fixedly installed on the frame 7, and the fixed frame 805 is positioned above the upper-layer floating sieve box 6; an active vibration exciter 802 of a box-type structure is located inside the frame of a fixed frame 805; the spring guide devices 804 are provided in plurality and comprise vertical spring guide devices and transverse spring guide devices, and the vertical spring guide devices and the transverse spring guide devices respectively comprise guide shafts and pressure springs sleeved on the guide shafts; the driven vibration exciter 803 of a frame structure is arranged between the driving vibration exciter 802 and a fixed frame 805, the driven vibration exciter 803 is connected with the fixed frame 805 through transverse spring guiding devices which are symmetrically arranged front and back, and the driven vibration exciter 803 is connected with the driving vibration exciter 802 through vertical spring guiding devices which are symmetrically arranged up and down; the upper and lower limiting guiding sliding mechanisms 806 positioned right below the driving vibration exciter 802 are arranged between the driven vibration exciter 803 and the fixed frame 805, the guiding sliding directions of the upper and lower limiting guiding sliding mechanisms 806 are arranged along the front-rear direction, the upper and lower limiting guiding sliding mechanisms 806 can be a T-shaped groove structure or a dovetail groove structure which is protruded out of the fixed frame 805 and is independently arranged, or can be a T-shaped groove structure or a dovetail groove structure which is directly arranged on the fixed frame 805, and the upper and lower limiting guiding sliding mechanisms 806 are connected with the driven vibration exciter 803 through upper and lower limiting sliding blocks matched with the upper and lower limiting guiding sliding; an eccentric excitation shaft 801 arranged along the left and right directions in the axial direction is horizontally erected and installed inside the active vibration exciter 802 through a bearing, an eccentric block is arranged on the eccentric excitation shaft 801, the shaft end of the eccentric excitation shaft 801 is in transmission connection with an excitation driving motor 15 through a coupling 16, the excitation driving motor 15 is fixedly installed on the rack 7, or the excitation driving motor 15 is installed on the ground through a support frame; two ends of an upper layer transmission rod 807 which is vertically arranged are respectively and fixedly arranged on the active vibration exciter 802 and the upper layer floating sieve box 6; the top end of the vertically arranged lower layer driving rod 808 is fixedly arranged on the driven vibration exciter 803, the bottom end of the vertically arranged lower layer driving rod 808 is hinged with the top end of the vertically arranged steering rod 809, the bottom end of the steering rod 809 is hinged with the lower layer floating sieve box 4, and the middle part of the rod body of the steering rod 809 is hinged with the rack 7.
The working principle of the high-efficiency double-layer multistage vibrating screen is as follows: when the excitation driving motor 15 works, the eccentric excitation shaft 801 is driven to move through the coupler 16, the active vibration exciter 801 makes an elliptic motion under the action of an inertial excitation force generated by an eccentric block of the eccentric excitation shaft 801, and the active vibration exciter 801 drives the upper floating sieve box 6 to make an elliptic motion through the upper transmission rod 807; meanwhile, the driven vibration exciter 803 performs horizontal reciprocating motion in the front-back direction along with the elliptical motion of the driving vibration exciter 801 under the limitation of the spring guide device 804 and the upper and lower limiting guiding sliding mechanisms 806, and the horizontal upper and lower limiting guiding sliding mechanisms 806 not only have a guiding function, but also have a certain supporting function; as shown in fig. 5, the lower transmission rod 808 transmits the horizontal reciprocating motion of the driven vibration exciter 803 to the steering rod 809, and since the middle part of the rod body of the steering rod 809 is hinged with the frame 7, the steering rod 809 transmits the motion opposite to the motion direction of the driven vibration exciter 803 to the lower floating sieve box 4, so that the lower floating sieve box 4 horizontally reciprocates in the opposite direction relative to the driven vibration exciter 803, that is, the upper floating sieve box 6 and the lower floating sieve box 4 alternately move relatively to the upper fixed sieve box 5 and the lower fixed sieve box 3 in different directions, tracks and speeds, so that the coarse flexible screen 11 and the fine flexible screen 13 perform periodic loosening-tensioning motion to perform material screening. The upper layer elastic suspension rod group 10 and the lower layer elastic suspension rod group 12 which can freely stretch up and down and reset realize the damping effect through the repulsion force generated by the compression of the internal reset spring in the motion process of the upper layer floating sieve box 6 and the lower layer floating sieve box 4. The vibration amplitude of the vibrating screen can be changed by adjusting the weight of the balancing weight 17 on the lower floating screen box 4 according to actual needs.
When the upper floating sieve box 6 swings back and forth and up and down along the elliptical motion track, in order to increase the motion stability of the upper floating sieve box 6, as a further improvement of the present invention, top end hinge pins of upper elastic suspension rods 10 symmetrically arranged left and right are installed on the frame 7 through a bearing set 9, and top end hinge pins of two upper elastic suspension rods 10 symmetrically arranged left and right share the same hinge pin, that is, the upper elastic suspension rods 10 can form an integral frame structure with the upper floating sieve box 6 through top end hinge pins thereof.
In order to increase the motion stability of the upper floating sieve box 6 and the lower floating sieve box 4, as a further improvement of the present invention, as shown in fig. 2, the installation assemblies of the excitation motion devices 8, including the driving vibration exciter 802, the driven vibration exciter 803, the spring guide 804, the fixed frame 805, the upper and lower limiting guide sliding mechanism 806, the upper transmission rod 807, the lower transmission rod 808 and the steering rod 809, are at least arranged in two groups bilaterally symmetrically with respect to the frame 7, the installation assemblies of the two groups of excitation motion devices 8 share the same eccentric excitation shaft 801, and the upper transmission rod 807, the lower transmission rod 808 and the steering rod 809 of the installation assemblies of the two groups of excitation motion devices 8 are respectively arranged corresponding to the left and right side surfaces of the upper floating sieve box 6 and the lower floating sieve box 4.
In order to adjust the amount of movement of the lower floating sieve box 4 in the front-rear direction in a reciprocating manner, as shown in fig. 4 and 5, as a further improvement of the present invention, a plurality of rod body hinge holes are formed in the rod body of the steering rod 809 along the length direction, a plurality of frame hinge holes are formed in the frame 7 corresponding to the rod body hinge holes of the steering rod 809, and the amount of movement of the lower floating sieve box 4 in the front-rear direction in a reciprocating manner is adjusted by inserting hinge pins into the rod body hinge holes and the frame hinge holes at different height positions in a matching manner.
In order to avoid the material screened by the upper fixed screen box 5 from spilling, as a further improvement of the invention, as shown in fig. 1, the coverage area size of the fine flexible screen 13 of at least the lower floating screen box 4 in the front-back direction is larger than the coverage area size of the coarse flexible screen 11 of the upper floating screen box 6 in the front-back direction.
The high-efficiency double-layer multistage vibrating screen can realize low energy consumption ratio, large treatment capacity, small noise and controllable amplitude, simultaneously drives the elliptic motion track motion of the upper floating screen box 6 and the horizontal reciprocating motion of the lower floating screen box 4 along the front-back direction through the excitation motion device 8, and the reciprocating motion direction of the lower floating screen box 4 in the front-back direction is opposite to the motion direction of the upper floating screen box 6 in the front-back direction, so that the upper floating screen box 6 and the lower floating screen box 4 respectively perform alternate relative motion in different directions, tracks and speeds relative to the upper fixed screen box 5 and the lower fixed screen box 3, thereby enabling the coarse flexible screen 11 and the fine flexible screen 13 to perform periodic loosening-tensioning motion for screening materials, improving the screening rate of fine particle material multistage screening, improving the screening efficiency and the treatment capacity, can complete the dry-type high-efficiency screening of the material with high viscosity and difficult screening, and is particularly suitable for the raw coal grading screening in the coal dressing process.
Claims (10)
1. A high-efficiency double-layer multistage vibrating screen comprises a base (1), a frame (7), an upper layer fixed screen box (5), an upper layer floating screen box (6), a lower layer fixed screen box (3), a lower layer floating screen box (4) and an excitation motion device (8); it is characterized in that the preparation method is characterized in that,
the rack (7) is of a frame structure, and the whole rack (7) is positioned and installed on the base (1) through a plurality of damping spring groups (2) which are vertically guided and telescopically arranged; the upper fixed sieve box (5) and the lower fixed sieve box (3) respectively correspond to the middle part and the lower part of the frame (7) from top to bottom, the upper floating sieve box (6) and the lower floating sieve box (4) are respectively arranged on the frame (7) through a plurality of upper elastic suspension rods (10) and lower elastic suspension rods (12) which are arranged in bilateral symmetry, the upper floating sieve box (6) and the lower floating sieve box (4) are respectively arranged right above the upper fixed sieve box (5) and the lower fixed sieve box (3) from top to bottom in a corresponding mode, the two ends of the upper elastic suspension rods (10) which can freely stretch out and draw back from top to bottom are respectively hinged to the tops of the upper floating sieve box (6) and the frame (7) through hinge shafts which are arranged in the left and right directions in the axial direction, and the two ends of the lower elastic suspension rods (12) which can freely stretch out and draw back from top to bottom are respectively hinged to the lower floating sieve box (4) through hinge shafts which are arranged in the left and right directions in the axial direction And the middle part of the frame (7); screen mesh support frames are uniformly and alternately arranged on the upper fixed screen box (5), the upper floating screen box (6), the lower fixed screen box (3) and the lower floating screen box (4) from front to back, a coarse-hole flexible screen mesh (11) is connected between two adjacent screen mesh support frames of the upper fixed screen box (5) and the upper floating screen box (6), and a fine-hole flexible screen mesh (13) is connected between two adjacent screen mesh support frames of the lower fixed screen box (3) and the lower floating screen box (4);
the excitation motion device (8) comprises an eccentric excitation shaft (801), a driving vibration exciter (802), a driven vibration exciter (803), a spring guide device (804), a fixed frame (805), an upper limit guide sliding mechanism (806), a lower layer transmission rod (807), a lower layer transmission rod (808) and a steering rod (809); the fixed frame (805) is fixedly arranged on the frame (7), and the fixed frame (805) is positioned above the upper-layer floating sieve box (6); the active vibration exciter (802) with a box-type structure is positioned in the frame shape of the fixed frame (805); the spring guide devices (804) are arranged in a plurality of numbers and comprise vertical spring guide devices and transverse spring guide devices, and the vertical spring guide devices and the transverse spring guide devices respectively comprise guide shafts and pressure springs sleeved on the guide shafts; the driven vibration exciter (803) with a frame structure is arranged between the driving vibration exciter (802) and a fixed frame (805), the driven vibration exciter (803) is connected with the fixed frame (805) through transverse spring guide devices which are symmetrically arranged in the front-back direction, and the driven vibration exciter (803) is connected with the driving vibration exciter (802) through vertical spring guide devices which are symmetrically arranged in the up-down direction; the upper and lower limiting guide sliding mechanism (806) positioned right below the driving vibration exciter (802) is arranged between the driven vibration exciter (803) and the fixed frame (805), the guide sliding direction of the upper and lower limiting guide sliding mechanism (806) is arranged along the front and back direction, and the upper and lower limiting guide sliding mechanism (806) is connected with the driven vibration exciter (803) through an upper and lower limiting sliding block matched with the upper and lower limiting sliding mechanism; an eccentric excitation shaft (801) arranged along the left and right directions in the axial direction is horizontally erected and installed inside an active vibration exciter (802) through a bearing, an eccentric block is arranged on the eccentric excitation shaft (801), the shaft end of the eccentric excitation shaft (801) is in transmission connection with an excitation driving motor (15) through a coupling (16), and the excitation driving motor (15) is fixedly installed on a rack (7) or the excitation driving motor (15) is installed on the ground through a support frame; two ends of an upper layer transmission rod (807) which is vertically arranged are respectively and fixedly arranged on the active vibration exciter (802) and the upper layer floating sieve box (6); the top end of a vertically arranged lower layer transmission rod (808) is fixedly arranged on the driven vibration exciter (803), the bottom end of the vertically arranged lower layer transmission rod is hinged with the top end of a vertically arranged steering rod (809), the bottom end of the steering rod (809) is hinged with the lower layer floating sieve box (4), and the middle part of a rod body of the steering rod (809) is hinged with the rack (7).
2. The high-efficiency double-layer multistage vibrating screen is characterized in that the upper-layer elastic suspension rod (10) and the lower-layer elastic suspension rod (12) respectively comprise a telescopic rod and a telescopic guide sleeve which are coaxially arranged, a piston structure matched with the inner diameter of the telescopic guide sleeve is arranged at the bottom of the telescopic rod positioned in the telescopic guide sleeve, and return springs abutting against the telescopic guide sleeve are respectively arranged above and below the piston structure.
3. A high efficiency double layered multistage vibrating screen according to claim 1, characterized in that the coarse (11) and fine (13) flexible screens are polyurethane flexible screens.
4. A high efficiency double deck multistage vibrating screen as claimed in claim 1, wherein the front or rear end of the lower deck floating screen box (4) is fitted with a counterweight (17).
5. The high-efficiency double-layer multistage vibrating screen according to any one of claims 1 to 4, characterized in that top end hinge pins of the upper-layer elastic suspension rods (10) which are arranged in bilateral symmetry are mounted on the frame (7) through bearing sets (9), and the top end hinge pins of the two upper-layer elastic suspension rods (10) which are arranged in bilateral symmetry share the same hinge pin.
6. The high-efficiency double-layer multistage vibrating screen is characterized in that mounting assemblies of the excitation motion devices (8) comprising a driving vibration exciter (802), a driven vibration exciter (803), a spring guide device (804), a fixing frame (805), an upper limiting and lower limiting guide sliding mechanism (806), an upper transmission rod (807), a lower transmission rod (808) and a steering rod (809) are at least arranged in two groups in bilateral symmetry relative to a rack (7), the mounting assemblies of the two groups of excitation motion devices (8) share the same eccentric excitation shaft (801), and the upper transmission rod (807), the lower transmission rod (808) and the steering rod (809) of the mounting assemblies of the two groups of excitation motion devices (8) are respectively arranged corresponding to the left side face and the right side face of an upper floating screen box (6) and a lower floating screen box (4).
7. A high efficiency double deck multistage vibrating screen according to any one of claims 1 to 4, characterized in that the body of the steering rod (809) is provided with a plurality of rod body hinge holes along its length direction, and the frame (7) is provided with a plurality of frame hinge holes corresponding to the rod body hinge holes of the steering rod (809).
8. A high efficiency double deck multistage vibrating screen according to any one of claims 1 to 4, wherein the upper and lower limiting guiding sliding mechanisms (806) are T-shaped groove structures or dovetail groove structures provided protruding from the fixed frame (805), or T-shaped groove structures or dovetail groove structures provided directly on the fixed frame (805).
9. A high efficiency double deck multistage vibrating screen according to any one of claims 1 to 4, characterized in that the damping spring package (2) is of rubber spring construction.
10. A high efficiency double deck multistage vibrating screen according to any one of claims 1 to 4, characterized in that the coverage area dimension of the fine mesh flexible screen (13) of at least the lower deck floating screen box (4) in the fore-and-aft direction is larger than the coverage area dimension of the coarse mesh flexible screen (11) of the upper deck floating screen box (6) in the fore-and-aft direction.
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| CN202110008331.XA CN112642702B (en) | 2021-01-05 | 2021-01-05 | High-efficient double-deck multistage shale shaker |
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| CN202110008331.XA CN112642702B (en) | 2021-01-05 | 2021-01-05 | High-efficient double-deck multistage shale shaker |
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| CN114042623A (en) * | 2021-11-08 | 2022-02-15 | 中国矿业大学 | Combined driving type circular vibration multilayer flip-flow screen |
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| CN112642702B (en) | 2021-09-24 |
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